/**
 * @videojs/http-streaming
 * @version 1.10.6
 * @copyright 2019 Brightcove, Inc
 * @license Apache-2.0
 */
'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var URLToolkit = _interopDefault(require('url-toolkit'));
var window$1 = _interopDefault(require('global/window'));
var videojs = _interopDefault(require('video.js'));
var m3u8Parser = require('m3u8-parser');
var document = _interopDefault(require('global/document'));
var mpdParser = require('mpd-parser');
var mp4Inspector = _interopDefault(require('mux.js/lib/tools/mp4-inspector'));
var mp4probe = _interopDefault(require('mux.js/lib/mp4/probe'));
var CaptionParser = _interopDefault(require('mux.js/lib/mp4/caption-parser'));
var tsInspector = _interopDefault(require('mux.js/lib/tools/ts-inspector.js'));
var aesDecrypter = require('aes-decrypter');

/**
 * @file resolve-url.js - Handling how URLs are resolved and manipulated
 */

var resolveUrl = function resolveUrl(baseURL, relativeURL) {
  // return early if we don't need to resolve
  if (/^[a-z]+:/i.test(relativeURL)) {
    return relativeURL;
  }

  // if the base URL is relative then combine with the current location
  if (!/\/\//i.test(baseURL)) {
    baseURL = URLToolkit.buildAbsoluteURL(window$1.location.href, baseURL);
  }

  return URLToolkit.buildAbsoluteURL(baseURL, relativeURL);
};

/**
 * Checks whether xhr request was redirected and returns correct url depending
 * on `handleManifestRedirects` option
 *
 * @api private
 *
 * @param  {String} url - an url being requested
 * @param  {XMLHttpRequest} req - xhr request result
 *
 * @return {String}
 */
var resolveManifestRedirect = function resolveManifestRedirect(handleManifestRedirect, url, req) {
  // To understand how the responseURL below is set and generated:
  // - https://fetch.spec.whatwg.org/#concept-response-url
  // - https://fetch.spec.whatwg.org/#atomic-http-redirect-handling
  if (handleManifestRedirect && req.responseURL && url !== req.responseURL) {
    return req.responseURL;
  }

  return url;
};

var classCallCheck = function (instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
};

var createClass = function () {
  function defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  return function (Constructor, protoProps, staticProps) {
    if (protoProps) defineProperties(Constructor.prototype, protoProps);
    if (staticProps) defineProperties(Constructor, staticProps);
    return Constructor;
  };
}();

var get = function get(object, property, receiver) {
  if (object === null) object = Function.prototype;
  var desc = Object.getOwnPropertyDescriptor(object, property);

  if (desc === undefined) {
    var parent = Object.getPrototypeOf(object);

    if (parent === null) {
      return undefined;
    } else {
      return get(parent, property, receiver);
    }
  } else if ("value" in desc) {
    return desc.value;
  } else {
    var getter = desc.get;

    if (getter === undefined) {
      return undefined;
    }

    return getter.call(receiver);
  }
};

var inherits = function (subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
};

var possibleConstructorReturn = function (self, call) {
  if (!self) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return call && (typeof call === "object" || typeof call === "function") ? call : self;
};

var slicedToArray = function () {
  function sliceIterator(arr, i) {
    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i["return"]) _i["return"]();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  return function (arr, i) {
    if (Array.isArray(arr)) {
      return arr;
    } else if (Symbol.iterator in Object(arr)) {
      return sliceIterator(arr, i);
    } else {
      throw new TypeError("Invalid attempt to destructure non-iterable instance");
    }
  };
}();

/**
 * @file playlist-loader.js
 *
 * A state machine that manages the loading, caching, and updating of
 * M3U8 playlists.
 *
 */

var mergeOptions = videojs.mergeOptions,
    EventTarget = videojs.EventTarget,
    log = videojs.log;

/**
 * Loops through all supported media groups in master and calls the provided
 * callback for each group
 *
 * @param {Object} master
 *        The parsed master manifest object
 * @param {Function} callback
 *        Callback to call for each media group
 */

var forEachMediaGroup = function forEachMediaGroup(master, callback) {
  ['AUDIO', 'SUBTITLES'].forEach(function (mediaType) {
    for (var groupKey in master.mediaGroups[mediaType]) {
      for (var labelKey in master.mediaGroups[mediaType][groupKey]) {
        var mediaProperties = master.mediaGroups[mediaType][groupKey][labelKey];

        callback(mediaProperties, mediaType, groupKey, labelKey);
      }
    }
  });
};

/**
  * Returns a new array of segments that is the result of merging
  * properties from an older list of segments onto an updated
  * list. No properties on the updated playlist will be overridden.
  *
  * @param {Array} original the outdated list of segments
  * @param {Array} update the updated list of segments
  * @param {Number=} offset the index of the first update
  * segment in the original segment list. For non-live playlists,
  * this should always be zero and does not need to be
  * specified. For live playlists, it should be the difference
  * between the media sequence numbers in the original and updated
  * playlists.
  * @return a list of merged segment objects
  */
var updateSegments = function updateSegments(original, update, offset) {
  var result = update.slice();

  offset = offset || 0;
  var length = Math.min(original.length, update.length + offset);

  for (var i = offset; i < length; i++) {
    result[i - offset] = mergeOptions(original[i], result[i - offset]);
  }
  return result;
};

var resolveSegmentUris = function resolveSegmentUris(segment, baseUri) {
  if (!segment.resolvedUri) {
    segment.resolvedUri = resolveUrl(baseUri, segment.uri);
  }
  if (segment.key && !segment.key.resolvedUri) {
    segment.key.resolvedUri = resolveUrl(baseUri, segment.key.uri);
  }
  if (segment.map && !segment.map.resolvedUri) {
    segment.map.resolvedUri = resolveUrl(baseUri, segment.map.uri);
  }
};

/**
  * Returns a new master playlist that is the result of merging an
  * updated media playlist into the original version. If the
  * updated media playlist does not match any of the playlist
  * entries in the original master playlist, null is returned.
  *
  * @param {Object} master a parsed master M3U8 object
  * @param {Object} media a parsed media M3U8 object
  * @return {Object} a new object that represents the original
  * master playlist with the updated media playlist merged in, or
  * null if the merge produced no change.
  */
var updateMaster = function updateMaster(master, media) {
  var result = mergeOptions(master, {});
  var playlist = result.playlists[media.uri];

  if (!playlist) {
    return null;
  }

  // consider the playlist unchanged if the number of segments is equal, the media
  // sequence number is unchanged, and this playlist hasn't become the end of the playlist
  if (playlist.segments && media.segments && playlist.segments.length === media.segments.length && playlist.endList === media.endList && playlist.mediaSequence === media.mediaSequence) {
    return null;
  }

  var mergedPlaylist = mergeOptions(playlist, media);

  // if the update could overlap existing segment information, merge the two segment lists
  if (playlist.segments) {
    mergedPlaylist.segments = updateSegments(playlist.segments, media.segments, media.mediaSequence - playlist.mediaSequence);
  }

  // resolve any segment URIs to prevent us from having to do it later
  mergedPlaylist.segments.forEach(function (segment) {
    resolveSegmentUris(segment, mergedPlaylist.resolvedUri);
  });

  // TODO Right now in the playlists array there are two references to each playlist, one
  // that is referenced by index, and one by URI. The index reference may no longer be
  // necessary.
  for (var i = 0; i < result.playlists.length; i++) {
    if (result.playlists[i].uri === media.uri) {
      result.playlists[i] = mergedPlaylist;
    }
  }
  result.playlists[media.uri] = mergedPlaylist;

  return result;
};

var setupMediaPlaylists = function setupMediaPlaylists(master) {
  // setup by-URI lookups and resolve media playlist URIs
  var i = master.playlists.length;

  while (i--) {
    var playlist = master.playlists[i];

    master.playlists[playlist.uri] = playlist;
    playlist.resolvedUri = resolveUrl(master.uri, playlist.uri);
    playlist.id = i;

    if (!playlist.attributes) {
      // Although the spec states an #EXT-X-STREAM-INF tag MUST have a
      // BANDWIDTH attribute, we can play the stream without it. This means a poorly
      // formatted master playlist may not have an attribute list. An attributes
      // property is added here to prevent undefined references when we encounter
      // this scenario.
      playlist.attributes = {};

      log.warn('Invalid playlist STREAM-INF detected. Missing BANDWIDTH attribute.');
    }
  }
};

var resolveMediaGroupUris = function resolveMediaGroupUris(master) {
  forEachMediaGroup(master, function (properties) {
    if (properties.uri) {
      properties.resolvedUri = resolveUrl(master.uri, properties.uri);
    }
  });
};

/**
 * Calculates the time to wait before refreshing a live playlist
 *
 * @param {Object} media
 *        The current media
 * @param {Boolean} update
 *        True if there were any updates from the last refresh, false otherwise
 * @return {Number}
 *         The time in ms to wait before refreshing the live playlist
 */
var refreshDelay = function refreshDelay(media, update) {
  var lastSegment = media.segments[media.segments.length - 1];
  var delay = void 0;

  if (update && lastSegment && lastSegment.duration) {
    delay = lastSegment.duration * 1000;
  } else {
    // if the playlist is unchanged since the last reload or last segment duration
    // cannot be determined, try again after half the target duration
    delay = (media.targetDuration || 10) * 500;
  }
  return delay;
};

/**
 * Load a playlist from a remote location
 *
 * @class PlaylistLoader
 * @extends Stream
 * @param {String} srcUrl the url to start with
 * @param {Boolean} withCredentials the withCredentials xhr option
 * @constructor
 */

var PlaylistLoader = function (_EventTarget) {
  inherits(PlaylistLoader, _EventTarget);

  function PlaylistLoader(srcUrl, hls) {
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    classCallCheck(this, PlaylistLoader);

    var _this = possibleConstructorReturn(this, (PlaylistLoader.__proto__ || Object.getPrototypeOf(PlaylistLoader)).call(this));

    var _options$withCredenti = options.withCredentials,
        withCredentials = _options$withCredenti === undefined ? false : _options$withCredenti,
        _options$handleManife = options.handleManifestRedirects,
        handleManifestRedirects = _options$handleManife === undefined ? false : _options$handleManife;


    _this.srcUrl = srcUrl;
    _this.hls_ = hls;
    _this.withCredentials = withCredentials;
    _this.handleManifestRedirects = handleManifestRedirects;

    var hlsOptions = hls.options_;

    _this.customTagParsers = hlsOptions && hlsOptions.customTagParsers || [];
    _this.customTagMappers = hlsOptions && hlsOptions.customTagMappers || [];

    if (!_this.srcUrl) {
      throw new Error('A non-empty playlist URL is required');
    }

    // initialize the loader state
    _this.state = 'HAVE_NOTHING';

    // live playlist staleness timeout
    _this.on('mediaupdatetimeout', function () {
      if (_this.state !== 'HAVE_METADATA') {
        // only refresh the media playlist if no other activity is going on
        return;
      }

      _this.state = 'HAVE_CURRENT_METADATA';

      _this.request = _this.hls_.xhr({
        uri: resolveUrl(_this.master.uri, _this.media().uri),
        withCredentials: _this.withCredentials
      }, function (error, req) {
        // disposed
        if (!_this.request) {
          return;
        }

        if (error) {
          return _this.playlistRequestError(_this.request, _this.media().uri, 'HAVE_METADATA');
        }

        _this.haveMetadata(_this.request, _this.media().uri);
      });
    });
    return _this;
  }

  createClass(PlaylistLoader, [{
    key: 'playlistRequestError',
    value: function playlistRequestError(xhr, url, startingState) {
      // any in-flight request is now finished
      this.request = null;

      if (startingState) {
        this.state = startingState;
      }

      this.error = {
        playlist: this.master.playlists[url],
        status: xhr.status,
        message: 'HLS playlist request error at URL: ' + url + '.',
        responseText: xhr.responseText,
        code: xhr.status >= 500 ? 4 : 2
      };

      this.trigger('error');
    }

    // update the playlist loader's state in response to a new or
    // updated playlist.

  }, {
    key: 'haveMetadata',
    value: function haveMetadata(xhr, url) {
      var _this2 = this;

      // any in-flight request is now finished
      this.request = null;
      this.state = 'HAVE_METADATA';

      var parser = new m3u8Parser.Parser();

      // adding custom tag parsers
      this.customTagParsers.forEach(function (customParser) {
        return parser.addParser(customParser);
      });

      // adding custom tag mappers
      this.customTagMappers.forEach(function (mapper) {
        return parser.addTagMapper(mapper);
      });

      parser.push(xhr.responseText);
      parser.end();
      parser.manifest.uri = url;
      // m3u8-parser does not attach an attributes property to media playlists so make
      // sure that the property is attached to avoid undefined reference errors
      parser.manifest.attributes = parser.manifest.attributes || {};

      // merge this playlist into the master
      var update = updateMaster(this.master, parser.manifest);

      this.targetDuration = parser.manifest.targetDuration;

      if (update) {
        this.master = update;
        this.media_ = this.master.playlists[parser.manifest.uri];
      } else {
        this.trigger('playlistunchanged');
      }

      // refresh live playlists after a target duration passes
      if (!this.media().endList) {
        window$1.clearTimeout(this.mediaUpdateTimeout);
        this.mediaUpdateTimeout = window$1.setTimeout(function () {
          _this2.trigger('mediaupdatetimeout');
        }, refreshDelay(this.media(), !!update));
      }

      this.trigger('loadedplaylist');
    }

    /**
     * Abort any outstanding work and clean up.
     */

  }, {
    key: 'dispose',
    value: function dispose() {
      this.stopRequest();
      window$1.clearTimeout(this.mediaUpdateTimeout);
      window$1.clearTimeout(this.finalRenditionTimeout);
    }
  }, {
    key: 'stopRequest',
    value: function stopRequest() {
      if (this.request) {
        var oldRequest = this.request;

        this.request = null;
        oldRequest.onreadystatechange = null;
        oldRequest.abort();
      }
    }

    /**
     * When called without any arguments, returns the currently
     * active media playlist. When called with a single argument,
     * triggers the playlist loader to asynchronously switch to the
     * specified media playlist. Calling this method while the
     * loader is in the HAVE_NOTHING causes an error to be emitted
     * but otherwise has no effect.
     *
     * @param {Object=} playlist the parsed media playlist
     * object to switch to
     * @param {Boolean=} is this the last available playlist
     *
     * @return {Playlist} the current loaded media
     */

  }, {
    key: 'media',
    value: function media(playlist, isFinalRendition) {
      var _this3 = this;

      // getter
      if (!playlist) {
        return this.media_;
      }

      // setter
      if (this.state === 'HAVE_NOTHING') {
        throw new Error('Cannot switch media playlist from ' + this.state);
      }

      // find the playlist object if the target playlist has been
      // specified by URI
      if (typeof playlist === 'string') {
        if (!this.master.playlists[playlist]) {
          throw new Error('Unknown playlist URI: ' + playlist);
        }
        playlist = this.master.playlists[playlist];
      }

      window$1.clearTimeout(this.finalRenditionTimeout);

      if (isFinalRendition) {
        var delay = playlist.targetDuration / 2 * 1000 || 5 * 1000;

        this.finalRenditionTimeout = window$1.setTimeout(this.media.bind(this, playlist, false), delay);
        return;
      }

      var startingState = this.state;
      var mediaChange = !this.media_ || playlist.uri !== this.media_.uri;

      // switch to fully loaded playlists immediately
      if (this.master.playlists[playlist.uri].endList) {
        // abort outstanding playlist requests
        if (this.request) {
          this.request.onreadystatechange = null;
          this.request.abort();
          this.request = null;
        }
        this.state = 'HAVE_METADATA';
        this.media_ = playlist;

        // trigger media change if the active media has been updated
        if (mediaChange) {
          this.trigger('mediachanging');
          this.trigger('mediachange');
        }
        return;
      }

      // switching to the active playlist is a no-op
      if (!mediaChange) {
        return;
      }

      this.state = 'SWITCHING_MEDIA';

      // there is already an outstanding playlist request
      if (this.request) {
        if (playlist.resolvedUri === this.request.url) {
          // requesting to switch to the same playlist multiple times
          // has no effect after the first
          return;
        }
        this.request.onreadystatechange = null;
        this.request.abort();
        this.request = null;
      }

      // request the new playlist
      if (this.media_) {
        this.trigger('mediachanging');
      }

      this.request = this.hls_.xhr({
        uri: playlist.resolvedUri,
        withCredentials: this.withCredentials
      }, function (error, req) {
        // disposed
        if (!_this3.request) {
          return;
        }

        playlist.resolvedUri = resolveManifestRedirect(_this3.handleManifestRedirects, playlist.resolvedUri, req);

        if (error) {
          return _this3.playlistRequestError(_this3.request, playlist.uri, startingState);
        }

        _this3.haveMetadata(req, playlist.uri);

        // fire loadedmetadata the first time a media playlist is loaded
        if (startingState === 'HAVE_MASTER') {
          _this3.trigger('loadedmetadata');
        } else {
          _this3.trigger('mediachange');
        }
      });
    }

    /**
     * pause loading of the playlist
     */

  }, {
    key: 'pause',
    value: function pause() {
      this.stopRequest();
      window$1.clearTimeout(this.mediaUpdateTimeout);
      if (this.state === 'HAVE_NOTHING') {
        // If we pause the loader before any data has been retrieved, its as if we never
        // started, so reset to an unstarted state.
        this.started = false;
      }
      // Need to restore state now that no activity is happening
      if (this.state === 'SWITCHING_MEDIA') {
        // if the loader was in the process of switching media, it should either return to
        // HAVE_MASTER or HAVE_METADATA depending on if the loader has loaded a media
        // playlist yet. This is determined by the existence of loader.media_
        if (this.media_) {
          this.state = 'HAVE_METADATA';
        } else {
          this.state = 'HAVE_MASTER';
        }
      } else if (this.state === 'HAVE_CURRENT_METADATA') {
        this.state = 'HAVE_METADATA';
      }
    }

    /**
     * start loading of the playlist
     */

  }, {
    key: 'load',
    value: function load(isFinalRendition) {
      var _this4 = this;

      window$1.clearTimeout(this.mediaUpdateTimeout);

      var media = this.media();

      if (isFinalRendition) {
        var delay = media ? media.targetDuration / 2 * 1000 : 5 * 1000;

        this.mediaUpdateTimeout = window$1.setTimeout(function () {
          return _this4.load();
        }, delay);
        return;
      }

      if (!this.started) {
        this.start();
        return;
      }

      if (media && !media.endList) {
        this.trigger('mediaupdatetimeout');
      } else {
        this.trigger('loadedplaylist');
      }
    }

    /**
     * start loading of the playlist
     */

  }, {
    key: 'start',
    value: function start() {
      var _this5 = this;

      this.started = true;

      // request the specified URL
      this.request = this.hls_.xhr({
        uri: this.srcUrl,
        withCredentials: this.withCredentials
      }, function (error, req) {
        // disposed
        if (!_this5.request) {
          return;
        }

        // clear the loader's request reference
        _this5.request = null;

        if (error) {
          _this5.error = {
            status: req.status,
            message: 'HLS playlist request error at URL: ' + _this5.srcUrl + '.',
            responseText: req.responseText,
            // MEDIA_ERR_NETWORK
            code: 2
          };
          if (_this5.state === 'HAVE_NOTHING') {
            _this5.started = false;
          }
          return _this5.trigger('error');
        }

        var parser = new m3u8Parser.Parser();

        // adding custom tag parsers
        _this5.customTagParsers.forEach(function (customParser) {
          return parser.addParser(customParser);
        });

        // adding custom tag mappers
        _this5.customTagMappers.forEach(function (mapper) {
          return parser.addTagMapper(mapper);
        });

        parser.push(req.responseText);
        parser.end();

        _this5.state = 'HAVE_MASTER';

        _this5.srcUrl = resolveManifestRedirect(_this5.handleManifestRedirects, _this5.srcUrl, req);

        parser.manifest.uri = _this5.srcUrl;

        // loaded a master playlist
        if (parser.manifest.playlists) {
          _this5.master = parser.manifest;

          setupMediaPlaylists(_this5.master);
          resolveMediaGroupUris(_this5.master);

          _this5.trigger('loadedplaylist');
          if (!_this5.request) {
            // no media playlist was specifically selected so start
            // from the first listed one
            _this5.media(parser.manifest.playlists[0]);
          }
          return;
        }

        // loaded a media playlist
        // infer a master playlist if none was previously requested
        _this5.master = {
          mediaGroups: {
            'AUDIO': {},
            'VIDEO': {},
            'CLOSED-CAPTIONS': {},
            'SUBTITLES': {}
          },
          uri: window$1.location.href,
          playlists: [{
            uri: _this5.srcUrl,
            id: 0,
            resolvedUri: _this5.srcUrl,
            // m3u8-parser does not attach an attributes property to media playlists so make
            // sure that the property is attached to avoid undefined reference errors
            attributes: {}
          }]
        };
        _this5.master.playlists[_this5.srcUrl] = _this5.master.playlists[0];
        _this5.haveMetadata(req, _this5.srcUrl);
        return _this5.trigger('loadedmetadata');
      });
    }
  }]);
  return PlaylistLoader;
}(EventTarget);

/**
 * @file playlist.js
 *
 * Playlist related utilities.
 */

var createTimeRange = videojs.createTimeRange;

/**
 * walk backward until we find a duration we can use
 * or return a failure
 *
 * @param {Playlist} playlist the playlist to walk through
 * @param {Number} endSequence the mediaSequence to stop walking on
 */

var backwardDuration = function backwardDuration(playlist, endSequence) {
  var result = 0;
  var i = endSequence - playlist.mediaSequence;
  // if a start time is available for segment immediately following
  // the interval, use it
  var segment = playlist.segments[i];

  // Walk backward until we find the latest segment with timeline
  // information that is earlier than endSequence
  if (segment) {
    if (typeof segment.start !== 'undefined') {
      return { result: segment.start, precise: true };
    }
    if (typeof segment.end !== 'undefined') {
      return {
        result: segment.end - segment.duration,
        precise: true
      };
    }
  }
  while (i--) {
    segment = playlist.segments[i];
    if (typeof segment.end !== 'undefined') {
      return { result: result + segment.end, precise: true };
    }

    result += segment.duration;

    if (typeof segment.start !== 'undefined') {
      return { result: result + segment.start, precise: true };
    }
  }
  return { result: result, precise: false };
};

/**
 * walk forward until we find a duration we can use
 * or return a failure
 *
 * @param {Playlist} playlist the playlist to walk through
 * @param {Number} endSequence the mediaSequence to stop walking on
 */
var forwardDuration = function forwardDuration(playlist, endSequence) {
  var result = 0;
  var segment = void 0;
  var i = endSequence - playlist.mediaSequence;
  // Walk forward until we find the earliest segment with timeline
  // information

  for (; i < playlist.segments.length; i++) {
    segment = playlist.segments[i];
    if (typeof segment.start !== 'undefined') {
      return {
        result: segment.start - result,
        precise: true
      };
    }

    result += segment.duration;

    if (typeof segment.end !== 'undefined') {
      return {
        result: segment.end - result,
        precise: true
      };
    }
  }
  // indicate we didn't find a useful duration estimate
  return { result: -1, precise: false };
};

/**
  * Calculate the media duration from the segments associated with a
  * playlist. The duration of a subinterval of the available segments
  * may be calculated by specifying an end index.
  *
  * @param {Object} playlist a media playlist object
  * @param {Number=} endSequence an exclusive upper boundary
  * for the playlist.  Defaults to playlist length.
  * @param {Number} expired the amount of time that has dropped
  * off the front of the playlist in a live scenario
  * @return {Number} the duration between the first available segment
  * and end index.
  */
var intervalDuration = function intervalDuration(playlist, endSequence, expired) {
  var backward = void 0;
  var forward = void 0;

  if (typeof endSequence === 'undefined') {
    endSequence = playlist.mediaSequence + playlist.segments.length;
  }

  if (endSequence < playlist.mediaSequence) {
    return 0;
  }

  // do a backward walk to estimate the duration
  backward = backwardDuration(playlist, endSequence);
  if (backward.precise) {
    // if we were able to base our duration estimate on timing
    // information provided directly from the Media Source, return
    // it
    return backward.result;
  }

  // walk forward to see if a precise duration estimate can be made
  // that way
  forward = forwardDuration(playlist, endSequence);
  if (forward.precise) {
    // we found a segment that has been buffered and so it's
    // position is known precisely
    return forward.result;
  }

  // return the less-precise, playlist-based duration estimate
  return backward.result + expired;
};

/**
  * Calculates the duration of a playlist. If a start and end index
  * are specified, the duration will be for the subset of the media
  * timeline between those two indices. The total duration for live
  * playlists is always Infinity.
  *
  * @param {Object} playlist a media playlist object
  * @param {Number=} endSequence an exclusive upper
  * boundary for the playlist. Defaults to the playlist media
  * sequence number plus its length.
  * @param {Number=} expired the amount of time that has
  * dropped off the front of the playlist in a live scenario
  * @return {Number} the duration between the start index and end
  * index.
  */
var duration = function duration(playlist, endSequence, expired) {
  if (!playlist) {
    return 0;
  }

  if (typeof expired !== 'number') {
    expired = 0;
  }

  // if a slice of the total duration is not requested, use
  // playlist-level duration indicators when they're present
  if (typeof endSequence === 'undefined') {
    // if present, use the duration specified in the playlist
    if (playlist.totalDuration) {
      return playlist.totalDuration;
    }

    // duration should be Infinity for live playlists
    if (!playlist.endList) {
      return window$1.Infinity;
    }
  }

  // calculate the total duration based on the segment durations
  return intervalDuration(playlist, endSequence, expired);
};

/**
  * Calculate the time between two indexes in the current playlist
  * neight the start- nor the end-index need to be within the current
  * playlist in which case, the targetDuration of the playlist is used
  * to approximate the durations of the segments
  *
  * @param {Object} playlist a media playlist object
  * @param {Number} startIndex
  * @param {Number} endIndex
  * @return {Number} the number of seconds between startIndex and endIndex
  */
var sumDurations = function sumDurations(playlist, startIndex, endIndex) {
  var durations = 0;

  if (startIndex > endIndex) {
    var _ref = [endIndex, startIndex];
    startIndex = _ref[0];
    endIndex = _ref[1];
  }

  if (startIndex < 0) {
    for (var i = startIndex; i < Math.min(0, endIndex); i++) {
      durations += playlist.targetDuration;
    }
    startIndex = 0;
  }

  for (var _i = startIndex; _i < endIndex; _i++) {
    durations += playlist.segments[_i].duration;
  }

  return durations;
};

/**
 * Determines the media index of the segment corresponding to the safe edge of the live
 * window which is the duration of the last segment plus 2 target durations from the end
 * of the playlist.
 *
 * @param {Object} playlist
 *        a media playlist object
 * @return {Number}
 *         The media index of the segment at the safe live point. 0 if there is no "safe"
 *         point.
 * @function safeLiveIndex
 */
var safeLiveIndex = function safeLiveIndex(playlist) {
  if (!playlist.segments.length) {
    return 0;
  }

  var i = playlist.segments.length - 1;
  var distanceFromEnd = playlist.segments[i].duration || playlist.targetDuration;
  var safeDistance = distanceFromEnd + playlist.targetDuration * 2;

  while (i--) {
    distanceFromEnd += playlist.segments[i].duration;

    if (distanceFromEnd >= safeDistance) {
      break;
    }
  }

  return Math.max(0, i);
};

/**
 * Calculates the playlist end time
 *
 * @param {Object} playlist a media playlist object
 * @param {Number=} expired the amount of time that has
 *                  dropped off the front of the playlist in a live scenario
 * @param {Boolean|false} useSafeLiveEnd a boolean value indicating whether or not the
 *                        playlist end calculation should consider the safe live end
 *                        (truncate the playlist end by three segments). This is normally
 *                        used for calculating the end of the playlist's seekable range.
 * @returns {Number} the end time of playlist
 * @function playlistEnd
 */
var playlistEnd = function playlistEnd(playlist, expired, useSafeLiveEnd) {
  if (!playlist || !playlist.segments) {
    return null;
  }
  if (playlist.endList) {
    return duration(playlist);
  }

  if (expired === null) {
    return null;
  }

  expired = expired || 0;

  var endSequence = useSafeLiveEnd ? safeLiveIndex(playlist) : playlist.segments.length;

  return intervalDuration(playlist, playlist.mediaSequence + endSequence, expired);
};

/**
  * Calculates the interval of time that is currently seekable in a
  * playlist. The returned time ranges are relative to the earliest
  * moment in the specified playlist that is still available. A full
  * seekable implementation for live streams would need to offset
  * these values by the duration of content that has expired from the
  * stream.
  *
  * @param {Object} playlist a media playlist object
  * dropped off the front of the playlist in a live scenario
  * @param {Number=} expired the amount of time that has
  * dropped off the front of the playlist in a live scenario
  * @return {TimeRanges} the periods of time that are valid targets
  * for seeking
  */
var seekable = function seekable(playlist, expired) {
  var useSafeLiveEnd = true;
  var seekableStart = expired || 0;
  var seekableEnd = playlistEnd(playlist, expired, useSafeLiveEnd);

  if (seekableEnd === null) {
    return createTimeRange();
  }
  return createTimeRange(seekableStart, seekableEnd);
};

var isWholeNumber = function isWholeNumber(num) {
  return num - Math.floor(num) === 0;
};

var roundSignificantDigit = function roundSignificantDigit(increment, num) {
  // If we have a whole number, just add 1 to it
  if (isWholeNumber(num)) {
    return num + increment * 0.1;
  }

  var numDecimalDigits = num.toString().split('.')[1].length;

  for (var i = 1; i <= numDecimalDigits; i++) {
    var scale = Math.pow(10, i);
    var temp = num * scale;

    if (isWholeNumber(temp) || i === numDecimalDigits) {
      return (temp + increment) / scale;
    }
  }
};

var ceilLeastSignificantDigit = roundSignificantDigit.bind(null, 1);
var floorLeastSignificantDigit = roundSignificantDigit.bind(null, -1);

/**
 * Determine the index and estimated starting time of the segment that
 * contains a specified playback position in a media playlist.
 *
 * @param {Object} playlist the media playlist to query
 * @param {Number} currentTime The number of seconds since the earliest
 * possible position to determine the containing segment for
 * @param {Number} startIndex
 * @param {Number} startTime
 * @return {Object}
 */
var getMediaInfoForTime = function getMediaInfoForTime(playlist, currentTime, startIndex, startTime) {
  var i = void 0;
  var segment = void 0;
  var numSegments = playlist.segments.length;

  var time = currentTime - startTime;

  if (time < 0) {
    // Walk backward from startIndex in the playlist, adding durations
    // until we find a segment that contains `time` and return it
    if (startIndex > 0) {
      for (i = startIndex - 1; i >= 0; i--) {
        segment = playlist.segments[i];
        time += floorLeastSignificantDigit(segment.duration);
        if (time > 0) {
          return {
            mediaIndex: i,
            startTime: startTime - sumDurations(playlist, startIndex, i)
          };
        }
      }
    }
    // We were unable to find a good segment within the playlist
    // so select the first segment
    return {
      mediaIndex: 0,
      startTime: currentTime
    };
  }

  // When startIndex is negative, we first walk forward to first segment
  // adding target durations. If we "run out of time" before getting to
  // the first segment, return the first segment
  if (startIndex < 0) {
    for (i = startIndex; i < 0; i++) {
      time -= playlist.targetDuration;
      if (time < 0) {
        return {
          mediaIndex: 0,
          startTime: currentTime
        };
      }
    }
    startIndex = 0;
  }

  // Walk forward from startIndex in the playlist, subtracting durations
  // until we find a segment that contains `time` and return it
  for (i = startIndex; i < numSegments; i++) {
    segment = playlist.segments[i];
    time -= ceilLeastSignificantDigit(segment.duration);
    if (time < 0) {
      return {
        mediaIndex: i,
        startTime: startTime + sumDurations(playlist, startIndex, i)
      };
    }
  }

  // We are out of possible candidates so load the last one...
  return {
    mediaIndex: numSegments - 1,
    startTime: currentTime
  };
};

/**
 * Check whether the playlist is blacklisted or not.
 *
 * @param {Object} playlist the media playlist object
 * @return {boolean} whether the playlist is blacklisted or not
 * @function isBlacklisted
 */
var isBlacklisted = function isBlacklisted(playlist) {
  return playlist.excludeUntil && playlist.excludeUntil > Date.now();
};

/**
 * Check whether the playlist is compatible with current playback configuration or has
 * been blacklisted permanently for being incompatible.
 *
 * @param {Object} playlist the media playlist object
 * @return {boolean} whether the playlist is incompatible or not
 * @function isIncompatible
 */
var isIncompatible = function isIncompatible(playlist) {
  return playlist.excludeUntil && playlist.excludeUntil === Infinity;
};

/**
 * Check whether the playlist is enabled or not.
 *
 * @param {Object} playlist the media playlist object
 * @return {boolean} whether the playlist is enabled or not
 * @function isEnabled
 */
var isEnabled = function isEnabled(playlist) {
  var blacklisted = isBlacklisted(playlist);

  return !playlist.disabled && !blacklisted;
};

/**
 * Check whether the playlist has been manually disabled through the representations api.
 *
 * @param {Object} playlist the media playlist object
 * @return {boolean} whether the playlist is disabled manually or not
 * @function isDisabled
 */
var isDisabled = function isDisabled(playlist) {
  return playlist.disabled;
};

/**
 * Returns whether the current playlist is an AES encrypted HLS stream
 *
 * @return {Boolean} true if it's an AES encrypted HLS stream
 */
var isAes = function isAes(media) {
  for (var i = 0; i < media.segments.length; i++) {
    if (media.segments[i].key) {
      return true;
    }
  }
  return false;
};

/**
 * Returns whether the current playlist contains fMP4
 *
 * @return {Boolean} true if the playlist contains fMP4
 */
var isFmp4 = function isFmp4(media) {
  for (var i = 0; i < media.segments.length; i++) {
    if (media.segments[i].map) {
      return true;
    }
  }
  return false;
};

/**
 * Checks if the playlist has a value for the specified attribute
 *
 * @param {String} attr
 *        Attribute to check for
 * @param {Object} playlist
 *        The media playlist object
 * @return {Boolean}
 *         Whether the playlist contains a value for the attribute or not
 * @function hasAttribute
 */
var hasAttribute = function hasAttribute(attr, playlist) {
  return playlist.attributes && playlist.attributes[attr];
};

/**
 * Estimates the time required to complete a segment download from the specified playlist
 *
 * @param {Number} segmentDuration
 *        Duration of requested segment
 * @param {Number} bandwidth
 *        Current measured bandwidth of the player
 * @param {Object} playlist
 *        The media playlist object
 * @param {Number=} bytesReceived
 *        Number of bytes already received for the request. Defaults to 0
 * @return {Number|NaN}
 *         The estimated time to request the segment. NaN if bandwidth information for
 *         the given playlist is unavailable
 * @function estimateSegmentRequestTime
 */
var estimateSegmentRequestTime = function estimateSegmentRequestTime(segmentDuration, bandwidth, playlist) {
  var bytesReceived = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 0;

  if (!hasAttribute('BANDWIDTH', playlist)) {
    return NaN;
  }

  var size = segmentDuration * playlist.attributes.BANDWIDTH;

  return (size - bytesReceived * 8) / bandwidth;
};

/*
 * Returns whether the current playlist is the lowest rendition
 *
 * @return {Boolean} true if on lowest rendition
 */
var isLowestEnabledRendition = function isLowestEnabledRendition(master, media) {
  if (master.playlists.length === 1) {
    return true;
  }

  var currentBandwidth = media.attributes.BANDWIDTH || Number.MAX_VALUE;

  return master.playlists.filter(function (playlist) {
    if (!isEnabled(playlist)) {
      return false;
    }

    return (playlist.attributes.BANDWIDTH || 0) < currentBandwidth;
  }).length === 0;
};

// exports
var Playlist = {
  duration: duration,
  seekable: seekable,
  safeLiveIndex: safeLiveIndex,
  getMediaInfoForTime: getMediaInfoForTime,
  isEnabled: isEnabled,
  isDisabled: isDisabled,
  isBlacklisted: isBlacklisted,
  isIncompatible: isIncompatible,
  playlistEnd: playlistEnd,
  isAes: isAes,
  isFmp4: isFmp4,
  hasAttribute: hasAttribute,
  estimateSegmentRequestTime: estimateSegmentRequestTime,
  isLowestEnabledRendition: isLowestEnabledRendition
};

/**
 * @file xhr.js
 */

var videojsXHR = videojs.xhr,
    mergeOptions$1 = videojs.mergeOptions;


var xhrFactory = function xhrFactory() {
  var xhr = function XhrFunction(options, callback) {
    // Add a default timeout for all hls requests
    options = mergeOptions$1({
      timeout: 45e3
    }, options);

    // Allow an optional user-specified function to modify the option
    // object before we construct the xhr request
    var beforeRequest = XhrFunction.beforeRequest || videojs.Hls.xhr.beforeRequest;

    if (beforeRequest && typeof beforeRequest === 'function') {
      var newOptions = beforeRequest(options);

      if (newOptions) {
        options = newOptions;
      }
    }

    var request = videojsXHR(options, function (error, response) {
      var reqResponse = request.response;

      if (!error && reqResponse) {
        request.responseTime = Date.now();
        request.roundTripTime = request.responseTime - request.requestTime;
        request.bytesReceived = reqResponse.byteLength || reqResponse.length;
        if (!request.bandwidth) {
          request.bandwidth = Math.floor(request.bytesReceived / request.roundTripTime * 8 * 1000);
        }
      }

      if (response.headers) {
        request.responseHeaders = response.headers;
      }

      // videojs.xhr now uses a specific code on the error
      // object to signal that a request has timed out instead
      // of setting a boolean on the request object
      if (error && error.code === 'ETIMEDOUT') {
        request.timedout = true;
      }

      // videojs.xhr no longer considers status codes outside of 200 and 0
      // (for file uris) to be errors, but the old XHR did, so emulate that
      // behavior. Status 206 may be used in response to byterange requests.
      if (!error && !request.aborted && response.statusCode !== 200 && response.statusCode !== 206 && response.statusCode !== 0) {
        error = new Error('XHR Failed with a response of: ' + (request && (reqResponse || request.responseText)));
      }

      callback(error, request);
    });
    var originalAbort = request.abort;

    request.abort = function () {
      request.aborted = true;
      return originalAbort.apply(request, arguments);
    };
    request.uri = options.uri;
    request.requestTime = Date.now();
    return request;
  };

  return xhr;
};

/**
 * Turns segment byterange into a string suitable for use in
 * HTTP Range requests
 *
 * @param {Object} byterange - an object with two values defining the start and end
 *                             of a byte-range
 */
var byterangeStr = function byterangeStr(byterange) {
  var byterangeStart = void 0;
  var byterangeEnd = void 0;

  // `byterangeEnd` is one less than `offset + length` because the HTTP range
  // header uses inclusive ranges
  byterangeEnd = byterange.offset + byterange.length - 1;
  byterangeStart = byterange.offset;
  return 'bytes=' + byterangeStart + '-' + byterangeEnd;
};

/**
 * Defines headers for use in the xhr request for a particular segment.
 *
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 */
var segmentXhrHeaders = function segmentXhrHeaders(segment) {
  var headers = {};

  if (segment.byterange) {
    headers.Range = byterangeStr(segment.byterange);
  }
  return headers;
};

/**
 * @file bin-utils.js
 */

/**
 * convert a TimeRange to text
 *
 * @param {TimeRange} range the timerange to use for conversion
 * @param {Number} i the iterator on the range to convert
 */
var textRange = function textRange(range, i) {
  return range.start(i) + '-' + range.end(i);
};

/**
 * format a number as hex string
 *
 * @param {Number} e The number
 * @param {Number} i the iterator
 */
var formatHexString = function formatHexString(e, i) {
  var value = e.toString(16);

  return '00'.substring(0, 2 - value.length) + value + (i % 2 ? ' ' : '');
};
var formatAsciiString = function formatAsciiString(e) {
  if (e >= 0x20 && e < 0x7e) {
    return String.fromCharCode(e);
  }
  return '.';
};

/**
 * Creates an object for sending to a web worker modifying properties that are TypedArrays
 * into a new object with seperated properties for the buffer, byteOffset, and byteLength.
 *
 * @param {Object} message
 *        Object of properties and values to send to the web worker
 * @return {Object}
 *         Modified message with TypedArray values expanded
 * @function createTransferableMessage
 */
var createTransferableMessage = function createTransferableMessage(message) {
  var transferable = {};

  Object.keys(message).forEach(function (key) {
    var value = message[key];

    if (ArrayBuffer.isView(value)) {
      transferable[key] = {
        bytes: value.buffer,
        byteOffset: value.byteOffset,
        byteLength: value.byteLength
      };
    } else {
      transferable[key] = value;
    }
  });

  return transferable;
};

/**
 * Returns a unique string identifier for a media initialization
 * segment.
 */
var initSegmentId = function initSegmentId(initSegment) {
  var byterange = initSegment.byterange || {
    length: Infinity,
    offset: 0
  };

  return [byterange.length, byterange.offset, initSegment.resolvedUri].join(',');
};

/**
 * Returns a unique string identifier for a media segment key.
 */
var segmentKeyId = function segmentKeyId(key) {
  return key.resolvedUri;
};

/**
 * utils to help dump binary data to the console
 */
var hexDump = function hexDump(data) {
  var bytes = Array.prototype.slice.call(data);
  var step = 16;
  var result = '';
  var hex = void 0;
  var ascii = void 0;

  for (var j = 0; j < bytes.length / step; j++) {
    hex = bytes.slice(j * step, j * step + step).map(formatHexString).join('');
    ascii = bytes.slice(j * step, j * step + step).map(formatAsciiString).join('');
    result += hex + ' ' + ascii + '\n';
  }

  return result;
};

var tagDump = function tagDump(_ref) {
  var bytes = _ref.bytes;
  return hexDump(bytes);
};

var textRanges = function textRanges(ranges) {
  var result = '';
  var i = void 0;

  for (i = 0; i < ranges.length; i++) {
    result += textRange(ranges, i) + ' ';
  }
  return result;
};

var utils = /*#__PURE__*/Object.freeze({
  createTransferableMessage: createTransferableMessage,
  initSegmentId: initSegmentId,
  segmentKeyId: segmentKeyId,
  hexDump: hexDump,
  tagDump: tagDump,
  textRanges: textRanges
});

// TODO handle fmp4 case where the timing info is accurate and doesn't involve transmux

// Add 25% to the segment duration to account for small discrepencies in segment timing.
// 25% was arbitrarily chosen, and may need to be refined over time.
var SEGMENT_END_FUDGE_PERCENT = 0.25;

/**
 * Converts a player time (any time that can be gotten/set from player.currentTime(),
 * e.g., any time within player.seekable().start(0) to player.seekable().end(0)) to a
 * program time (any time referencing the real world (e.g., EXT-X-PROGRAM-DATE-TIME)).
 *
 * The containing segment is required as the EXT-X-PROGRAM-DATE-TIME serves as an "anchor
 * point" (a point where we have a mapping from program time to player time, with player
 * time being the post transmux start of the segment).
 *
 * For more details, see [this doc](../../docs/program-time-from-player-time.md).
 *
 * @param {Number} playerTime the player time
 * @param {Object} segment the segment which contains the player time
 * @return {Date} program time
 */
var playerTimeToProgramTime = function playerTimeToProgramTime(playerTime, segment) {
  if (!segment.dateTimeObject) {
    // Can't convert without an "anchor point" for the program time (i.e., a time that can
    // be used to map the start of a segment with a real world time).
    return null;
  }

  var transmuxerPrependedSeconds = segment.videoTimingInfo.transmuxerPrependedSeconds;
  var transmuxedStart = segment.videoTimingInfo.transmuxedPresentationStart;

  // get the start of the content from before old content is prepended
  var startOfSegment = transmuxedStart + transmuxerPrependedSeconds;
  var offsetFromSegmentStart = playerTime - startOfSegment;

  return new Date(segment.dateTimeObject.getTime() + offsetFromSegmentStart * 1000);
};

var originalSegmentVideoDuration = function originalSegmentVideoDuration(videoTimingInfo) {
  return videoTimingInfo.transmuxedPresentationEnd - videoTimingInfo.transmuxedPresentationStart - videoTimingInfo.transmuxerPrependedSeconds;
};

/**
 * Finds a segment that contains the time requested given as an ISO-8601 string. The
 * returned segment might be an estimate or an accurate match.
 *
 * @param {String} programTime The ISO-8601 programTime to find a match for
 * @param {Object} playlist A playlist object to search within
 */
var findSegmentForProgramTime = function findSegmentForProgramTime(programTime, playlist) {
  // Assumptions:
  //  - verifyProgramDateTimeTags has already been run
  //  - live streams have been started

  var dateTimeObject = void 0;

  try {
    dateTimeObject = new Date(programTime);
  } catch (e) {
    return null;
  }

  if (!playlist || !playlist.segments || playlist.segments.length === 0) {
    return null;
  }

  var segment = playlist.segments[0];

  if (dateTimeObject < segment.dateTimeObject) {
    // Requested time is before stream start.
    return null;
  }

  for (var i = 0; i < playlist.segments.length - 1; i++) {
    segment = playlist.segments[i];

    var nextSegmentStart = playlist.segments[i + 1].dateTimeObject;

    if (dateTimeObject < nextSegmentStart) {
      break;
    }
  }

  var lastSegment = playlist.segments[playlist.segments.length - 1];
  var lastSegmentStart = lastSegment.dateTimeObject;
  var lastSegmentDuration = lastSegment.videoTimingInfo ? originalSegmentVideoDuration(lastSegment.videoTimingInfo) : lastSegment.duration + lastSegment.duration * SEGMENT_END_FUDGE_PERCENT;
  var lastSegmentEnd = new Date(lastSegmentStart.getTime() + lastSegmentDuration * 1000);

  if (dateTimeObject > lastSegmentEnd) {
    // Beyond the end of the stream, or our best guess of the end of the stream.
    return null;
  }

  if (dateTimeObject > lastSegmentStart) {
    segment = lastSegment;
  }

  return {
    segment: segment,
    estimatedStart: segment.videoTimingInfo ? segment.videoTimingInfo.transmuxedPresentationStart : Playlist.duration(playlist, playlist.mediaSequence + playlist.segments.indexOf(segment)),
    // Although, given that all segments have accurate date time objects, the segment
    // selected should be accurate, unless the video has been transmuxed at some point
    // (determined by the presence of the videoTimingInfo object), the segment's "player
    // time" (the start time in the player) can't be considered accurate.
    type: segment.videoTimingInfo ? 'accurate' : 'estimate'
  };
};

/**
 * Finds a segment that contains the given player time(in seconds).
 *
 * @param {Number} time The player time to find a match for
 * @param {Object} playlist A playlist object to search within
 */
var findSegmentForPlayerTime = function findSegmentForPlayerTime(time, playlist) {
  // Assumptions:
  // - there will always be a segment.duration
  // - we can start from zero
  // - segments are in time order

  if (!playlist || !playlist.segments || playlist.segments.length === 0) {
    return null;
  }

  var segmentEnd = 0;
  var segment = void 0;

  for (var i = 0; i < playlist.segments.length; i++) {
    segment = playlist.segments[i];

    // videoTimingInfo is set after the segment is downloaded and transmuxed, and
    // should contain the most accurate values we have for the segment's player times.
    //
    // Use the accurate transmuxedPresentationEnd value if it is available, otherwise fall
    // back to an estimate based on the manifest derived (inaccurate) segment.duration, to
    // calculate an end value.
    segmentEnd = segment.videoTimingInfo ? segment.videoTimingInfo.transmuxedPresentationEnd : segmentEnd + segment.duration;

    if (time <= segmentEnd) {
      break;
    }
  }

  var lastSegment = playlist.segments[playlist.segments.length - 1];

  if (lastSegment.videoTimingInfo && lastSegment.videoTimingInfo.transmuxedPresentationEnd < time) {
    // The time requested is beyond the stream end.
    return null;
  }

  if (time > segmentEnd) {
    // The time is within or beyond the last segment.
    //
    // Check to see if the time is beyond a reasonable guess of the end of the stream.
    if (time > segmentEnd + lastSegment.duration * SEGMENT_END_FUDGE_PERCENT) {
      // Technically, because the duration value is only an estimate, the time may still
      // exist in the last segment, however, there isn't enough information to make even
      // a reasonable estimate.
      return null;
    }

    segment = lastSegment;
  }

  return {
    segment: segment,
    estimatedStart: segment.videoTimingInfo ? segment.videoTimingInfo.transmuxedPresentationStart : segmentEnd - segment.duration,
    // Because videoTimingInfo is only set after transmux, it is the only way to get
    // accurate timing values.
    type: segment.videoTimingInfo ? 'accurate' : 'estimate'
  };
};

/**
 * Gives the offset of the comparisonTimestamp from the programTime timestamp in seconds.
 * If the offset returned is positive, the programTime occurs after the
 * comparisonTimestamp.
 * If the offset is negative, the programTime occurs before the comparisonTimestamp.
 *
 * @param {String} comparisonTimeStamp An ISO-8601 timestamp to compare against
 * @param {String} programTime The programTime as an ISO-8601 string
 * @return {Number} offset
 */
var getOffsetFromTimestamp = function getOffsetFromTimestamp(comparisonTimeStamp, programTime) {
  var segmentDateTime = void 0;
  var programDateTime = void 0;

  try {
    segmentDateTime = new Date(comparisonTimeStamp);
    programDateTime = new Date(programTime);
  } catch (e) {
    // TODO handle error
  }

  var segmentTimeEpoch = segmentDateTime.getTime();
  var programTimeEpoch = programDateTime.getTime();

  return (programTimeEpoch - segmentTimeEpoch) / 1000;
};

/**
 * Checks that all segments in this playlist have programDateTime tags.
 *
 * @param {Object} playlist A playlist object
 */
var verifyProgramDateTimeTags = function verifyProgramDateTimeTags(playlist) {
  if (!playlist.segments || playlist.segments.length === 0) {
    return false;
  }

  for (var i = 0; i < playlist.segments.length; i++) {
    var segment = playlist.segments[i];

    if (!segment.dateTimeObject) {
      return false;
    }
  }

  return true;
};

/**
 * Returns the programTime of the media given a playlist and a playerTime.
 * The playlist must have programDateTime tags for a programDateTime tag to be returned.
 * If the segments containing the time requested have not been buffered yet, an estimate
 * may be returned to the callback.
 *
 * @param {Object} args
 * @param {Object} args.playlist A playlist object to search within
 * @param {Number} time A playerTime in seconds
 * @param {Function} callback(err, programTime)
 * @returns {String} err.message A detailed error message
 * @returns {Object} programTime
 * @returns {Number} programTime.mediaSeconds The streamTime in seconds
 * @returns {String} programTime.programDateTime The programTime as an ISO-8601 String
 */
var getProgramTime = function getProgramTime(_ref) {
  var playlist = _ref.playlist,
      _ref$time = _ref.time,
      time = _ref$time === undefined ? undefined : _ref$time,
      callback = _ref.callback;


  if (!callback) {
    throw new Error('getProgramTime: callback must be provided');
  }

  if (!playlist || time === undefined) {
    return callback({
      message: 'getProgramTime: playlist and time must be provided'
    });
  }

  var matchedSegment = findSegmentForPlayerTime(time, playlist);

  if (!matchedSegment) {
    return callback({
      message: 'valid programTime was not found'
    });
  }

  if (matchedSegment.type === 'estimate') {
    return callback({
      message: 'Accurate programTime could not be determined.' + ' Please seek to e.seekTime and try again',
      seekTime: matchedSegment.estimatedStart
    });
  }

  var programTimeObject = {
    mediaSeconds: time
  };
  var programTime = playerTimeToProgramTime(time, matchedSegment.segment);

  if (programTime) {
    programTimeObject.programDateTime = programTime.toISOString();
  }

  return callback(null, programTimeObject);
};

/**
 * Seeks in the player to a time that matches the given programTime ISO-8601 string.
 *
 * @param {Object} args
 * @param {String} args.programTime A programTime to seek to as an ISO-8601 String
 * @param {Object} args.playlist A playlist to look within
 * @param {Number} args.retryCount The number of times to try for an accurate seek. Default is 2.
 * @param {Function} args.seekTo A method to perform a seek
 * @param {Boolean} args.pauseAfterSeek Whether to end in a paused state after seeking. Default is true.
 * @param {Object} args.tech The tech to seek on
 * @param {Function} args.callback(err, newTime) A callback to return the new time to
 * @returns {String} err.message A detailed error message
 * @returns {Number} newTime The exact time that was seeked to in seconds
 */
var seekToProgramTime = function seekToProgramTime(_ref2) {
  var programTime = _ref2.programTime,
      playlist = _ref2.playlist,
      _ref2$retryCount = _ref2.retryCount,
      retryCount = _ref2$retryCount === undefined ? 2 : _ref2$retryCount,
      seekTo = _ref2.seekTo,
      _ref2$pauseAfterSeek = _ref2.pauseAfterSeek,
      pauseAfterSeek = _ref2$pauseAfterSeek === undefined ? true : _ref2$pauseAfterSeek,
      tech = _ref2.tech,
      callback = _ref2.callback;


  if (!callback) {
    throw new Error('seekToProgramTime: callback must be provided');
  }

  if (typeof programTime === 'undefined' || !playlist || !seekTo) {
    return callback({
      message: 'seekToProgramTime: programTime, seekTo and playlist must be provided'
    });
  }

  if (!playlist.endList && !tech.hasStarted_) {
    return callback({
      message: 'player must be playing a live stream to start buffering'
    });
  }

  if (!verifyProgramDateTimeTags(playlist)) {
    return callback({
      message: 'programDateTime tags must be provided in the manifest ' + playlist.resolvedUri
    });
  }

  var matchedSegment = findSegmentForProgramTime(programTime, playlist);

  // no match
  if (!matchedSegment) {
    return callback({
      message: programTime + ' was not found in the stream'
    });
  }

  var segment = matchedSegment.segment;
  var mediaOffset = getOffsetFromTimestamp(segment.dateTimeObject, programTime);

  if (matchedSegment.type === 'estimate') {
    // we've run out of retries
    if (retryCount === 0) {
      return callback({
        message: programTime + ' is not buffered yet. Try again'
      });
    }

    seekTo(matchedSegment.estimatedStart + mediaOffset);

    tech.one('seeked', function () {
      seekToProgramTime({
        programTime: programTime,
        playlist: playlist,
        retryCount: retryCount - 1,
        seekTo: seekTo,
        pauseAfterSeek: pauseAfterSeek,
        tech: tech,
        callback: callback
      });
    });

    return;
  }

  // Since the segment.start value is determined from the buffered end or ending time
  // of the prior segment, the seekToTime doesn't need to account for any transmuxer
  // modifications.
  var seekToTime = segment.start + mediaOffset;
  var seekedCallback = function seekedCallback() {
    return callback(null, tech.currentTime());
  };

  // listen for seeked event
  tech.one('seeked', seekedCallback);
  // pause before seeking as video.js will restore this state
  if (pauseAfterSeek) {
    tech.pause();
  }
  seekTo(seekToTime);
};

/**
 * ranges
 *
 * Utilities for working with TimeRanges.
 *
 */

// Fudge factor to account for TimeRanges rounding
var TIME_FUDGE_FACTOR = 1 / 30;
// Comparisons between time values such as current time and the end of the buffered range
// can be misleading because of precision differences or when the current media has poorly
// aligned audio and video, which can cause values to be slightly off from what you would
// expect. This value is what we consider to be safe to use in such comparisons to account
// for these scenarios.
var SAFE_TIME_DELTA = TIME_FUDGE_FACTOR * 3;
var filterRanges = function filterRanges(timeRanges, predicate) {
  var results = [];
  var i = void 0;

  if (timeRanges && timeRanges.length) {
    // Search for ranges that match the predicate
    for (i = 0; i < timeRanges.length; i++) {
      if (predicate(timeRanges.start(i), timeRanges.end(i))) {
        results.push([timeRanges.start(i), timeRanges.end(i)]);
      }
    }
  }

  return videojs.createTimeRanges(results);
};

/**
 * Attempts to find the buffered TimeRange that contains the specified
 * time.
 * @param {TimeRanges} buffered - the TimeRanges object to query
 * @param {number} time  - the time to filter on.
 * @returns {TimeRanges} a new TimeRanges object
 */
var findRange = function findRange(buffered, time) {
  return filterRanges(buffered, function (start, end) {
    return start - SAFE_TIME_DELTA <= time && end + SAFE_TIME_DELTA >= time;
  });
};

/**
 * Returns the TimeRanges that begin later than the specified time.
 * @param {TimeRanges} timeRanges - the TimeRanges object to query
 * @param {number} time - the time to filter on.
 * @returns {TimeRanges} a new TimeRanges object.
 */
var findNextRange = function findNextRange(timeRanges, time) {
  return filterRanges(timeRanges, function (start) {
    return start - TIME_FUDGE_FACTOR >= time;
  });
};

/**
 * Returns gaps within a list of TimeRanges
 * @param {TimeRanges} buffered - the TimeRanges object
 * @return {TimeRanges} a TimeRanges object of gaps
 */
var findGaps = function findGaps(buffered) {
  if (buffered.length < 2) {
    return videojs.createTimeRanges();
  }

  var ranges = [];

  for (var i = 1; i < buffered.length; i++) {
    var start = buffered.end(i - 1);
    var end = buffered.start(i);

    ranges.push([start, end]);
  }

  return videojs.createTimeRanges(ranges);
};

/**
 * Gets a human readable string for a TimeRange
 *
 * @param {TimeRange} range
 * @returns {String} a human readable string
 */
var printableRange = function printableRange(range) {
  var strArr = [];

  if (!range || !range.length) {
    return '';
  }

  for (var i = 0; i < range.length; i++) {
    strArr.push(range.start(i) + ' => ' + range.end(i));
  }

  return strArr.join(', ');
};

/**
 * Calculates the amount of time left in seconds until the player hits the end of the
 * buffer and causes a rebuffer
 *
 * @param {TimeRange} buffered
 *        The state of the buffer
 * @param {Numnber} currentTime
 *        The current time of the player
 * @param {Number} playbackRate
 *        The current playback rate of the player. Defaults to 1.
 * @return {Number}
 *         Time until the player has to start rebuffering in seconds.
 * @function timeUntilRebuffer
 */
var timeUntilRebuffer = function timeUntilRebuffer(buffered, currentTime) {
  var playbackRate = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;

  var bufferedEnd = buffered.length ? buffered.end(buffered.length - 1) : 0;

  return (bufferedEnd - currentTime) / playbackRate;
};

/**
 * Converts a TimeRanges object into an array representation
 * @param {TimeRanges} timeRanges
 * @returns {Array}
 */
var timeRangesToArray = function timeRangesToArray(timeRanges) {
  var timeRangesList = [];

  for (var i = 0; i < timeRanges.length; i++) {
    timeRangesList.push({
      start: timeRanges.start(i),
      end: timeRanges.end(i)
    });
  }

  return timeRangesList;
};

/**
 * @file create-text-tracks-if-necessary.js
 */

/**
 * Create text tracks on video.js if they exist on a segment.
 *
 * @param {Object} sourceBuffer the VSB or FSB
 * @param {Object} mediaSource the HTML media source
 * @param {Object} segment the segment that may contain the text track
 * @private
 */
var createTextTracksIfNecessary = function createTextTracksIfNecessary(sourceBuffer, mediaSource, segment) {
  var player = mediaSource.player_;

  // create an in-band caption track if one is present in the segment
  if (segment.captions && segment.captions.length) {
    if (!sourceBuffer.inbandTextTracks_) {
      sourceBuffer.inbandTextTracks_ = {};
    }

    for (var trackId in segment.captionStreams) {
      if (!sourceBuffer.inbandTextTracks_[trackId]) {
        player.tech_.trigger({ type: 'usage', name: 'hls-608' });
        var track = player.textTracks().getTrackById(trackId);

        if (track) {
          // Resuse an existing track with a CC# id because this was
          // very likely created by videojs-contrib-hls from information
          // in the m3u8 for us to use
          sourceBuffer.inbandTextTracks_[trackId] = track;
        } else {
          // Otherwise, create a track with the default `CC#` label and
          // without a language
          sourceBuffer.inbandTextTracks_[trackId] = player.addRemoteTextTrack({
            kind: 'captions',
            id: trackId,
            label: trackId
          }, false).track;
        }
      }
    }
  }

  if (segment.metadata && segment.metadata.length && !sourceBuffer.metadataTrack_) {
    sourceBuffer.metadataTrack_ = player.addRemoteTextTrack({
      kind: 'metadata',
      label: 'Timed Metadata'
    }, false).track;
    sourceBuffer.metadataTrack_.inBandMetadataTrackDispatchType = segment.metadata.dispatchType;
  }
};

/**
 * @file remove-cues-from-track.js
 */

/**
 * Remove cues from a track on video.js.
 *
 * @param {Double} start start of where we should remove the cue
 * @param {Double} end end of where the we should remove the cue
 * @param {Object} track the text track to remove the cues from
 * @private
 */
var removeCuesFromTrack = function removeCuesFromTrack(start, end, track) {
  var i = void 0;
  var cue = void 0;

  if (!track) {
    return;
  }

  if (!track.cues) {
    return;
  }

  i = track.cues.length;

  while (i--) {
    cue = track.cues[i];

    // Remove any overlapping cue
    if (cue.startTime <= end && cue.endTime >= start) {
      track.removeCue(cue);
    }
  }
};

/**
 * @file add-text-track-data.js
 */
/**
 * Define properties on a cue for backwards compatability,
 * but warn the user that the way that they are using it
 * is depricated and will be removed at a later date.
 *
 * @param {Cue} cue the cue to add the properties on
 * @private
 */
var deprecateOldCue = function deprecateOldCue(cue) {
  Object.defineProperties(cue.frame, {
    id: {
      get: function get() {
        videojs.log.warn('cue.frame.id is deprecated. Use cue.value.key instead.');
        return cue.value.key;
      }
    },
    value: {
      get: function get() {
        videojs.log.warn('cue.frame.value is deprecated. Use cue.value.data instead.');
        return cue.value.data;
      }
    },
    privateData: {
      get: function get() {
        videojs.log.warn('cue.frame.privateData is deprecated. Use cue.value.data instead.');
        return cue.value.data;
      }
    }
  });
};

var durationOfVideo = function durationOfVideo(duration) {
  var dur = void 0;

  if (isNaN(duration) || Math.abs(duration) === Infinity) {
    dur = Number.MAX_VALUE;
  } else {
    dur = duration;
  }
  return dur;
};
/**
 * Add text track data to a source handler given the captions and
 * metadata from the buffer.
 *
 * @param {Object} sourceHandler the virtual source buffer
 * @param {Array} captionArray an array of caption data
 * @param {Array} metadataArray an array of meta data
 * @private
 */
var addTextTrackData = function addTextTrackData(sourceHandler, captionArray, metadataArray) {
  var Cue = window$1.WebKitDataCue || window$1.VTTCue;

  if (captionArray) {
    captionArray.forEach(function (caption) {
      var track = caption.stream;

      this.inbandTextTracks_[track].addCue(new Cue(caption.startTime + this.timestampOffset, caption.endTime + this.timestampOffset, caption.text));
    }, sourceHandler);
  }

  if (metadataArray) {
    var videoDuration = durationOfVideo(sourceHandler.mediaSource_.duration);

    metadataArray.forEach(function (metadata) {
      var time = metadata.cueTime + this.timestampOffset;

      // if time isn't a finite number between 0 and Infinity, like NaN,
      // ignore this bit of metadata.
      // This likely occurs when you have an non-timed ID3 tag like TIT2,
      // which is the "Title/Songname/Content description" frame
      if (typeof time !== 'number' || window$1.isNaN(time) || time < 0 || !(time < Infinity)) {
        return;
      }

      metadata.frames.forEach(function (frame) {
        var cue = new Cue(time, time, frame.value || frame.url || frame.data || '');

        cue.frame = frame;
        cue.value = frame;
        deprecateOldCue(cue);

        this.metadataTrack_.addCue(cue);
      }, this);
    }, sourceHandler);

    // Updating the metadeta cues so that
    // the endTime of each cue is the startTime of the next cue
    // the endTime of last cue is the duration of the video
    if (sourceHandler.metadataTrack_ && sourceHandler.metadataTrack_.cues && sourceHandler.metadataTrack_.cues.length) {
      var cues = sourceHandler.metadataTrack_.cues;
      var cuesArray = [];

      // Create a copy of the TextTrackCueList...
      // ...disregarding cues with a falsey value
      for (var i = 0; i < cues.length; i++) {
        if (cues[i]) {
          cuesArray.push(cues[i]);
        }
      }

      // Group cues by their startTime value
      var cuesGroupedByStartTime = cuesArray.reduce(function (obj, cue) {
        var timeSlot = obj[cue.startTime] || [];

        timeSlot.push(cue);
        obj[cue.startTime] = timeSlot;

        return obj;
      }, {});

      // Sort startTimes by ascending order
      var sortedStartTimes = Object.keys(cuesGroupedByStartTime).sort(function (a, b) {
        return Number(a) - Number(b);
      });

      // Map each cue group's endTime to the next group's startTime
      sortedStartTimes.forEach(function (startTime, idx) {
        var cueGroup = cuesGroupedByStartTime[startTime];
        var nextTime = Number(sortedStartTimes[idx + 1]) || videoDuration;

        // Map each cue's endTime the next group's startTime
        cueGroup.forEach(function (cue) {
          cue.endTime = nextTime;
        });
      });
    }
  }
};

var win = typeof window !== 'undefined' ? window : {},
    TARGET = typeof Symbol === 'undefined' ? '__target' : Symbol(),
    SCRIPT_TYPE = 'application/javascript',
    BlobBuilder = win.BlobBuilder || win.WebKitBlobBuilder || win.MozBlobBuilder || win.MSBlobBuilder,
    URL = win.URL || win.webkitURL || URL && URL.msURL,
    Worker = win.Worker;

/**
 * Returns a wrapper around Web Worker code that is constructible.
 *
 * @function shimWorker
 *
 * @param { String }    filename    The name of the file
 * @param { Function }  fn          Function wrapping the code of the worker
 */
function shimWorker(filename, fn) {
    return function ShimWorker(forceFallback) {
        var o = this;

        if (!fn) {
            return new Worker(filename);
        } else if (Worker && !forceFallback) {
            // Convert the function's inner code to a string to construct the worker
            var source = fn.toString().replace(/^function.+?{/, '').slice(0, -1),
                objURL = createSourceObject(source);

            this[TARGET] = new Worker(objURL);
            wrapTerminate(this[TARGET], objURL);
            return this[TARGET];
        } else {
            var selfShim = {
                postMessage: function postMessage(m) {
                    if (o.onmessage) {
                        setTimeout(function () {
                            o.onmessage({ data: m, target: selfShim });
                        });
                    }
                }
            };

            fn.call(selfShim);
            this.postMessage = function (m) {
                setTimeout(function () {
                    selfShim.onmessage({ data: m, target: o });
                });
            };
            this.isThisThread = true;
        }
    };
}
// Test Worker capabilities
if (Worker) {
    var testWorker,
        objURL = createSourceObject('self.onmessage = function () {}'),
        testArray = new Uint8Array(1);

    try {
        testWorker = new Worker(objURL);

        // Native browser on some Samsung devices throws for transferables, let's detect it
        testWorker.postMessage(testArray, [testArray.buffer]);
    } catch (e) {
        Worker = null;
    } finally {
        URL.revokeObjectURL(objURL);
        if (testWorker) {
            testWorker.terminate();
        }
    }
}

function createSourceObject(str) {
    try {
        return URL.createObjectURL(new Blob([str], { type: SCRIPT_TYPE }));
    } catch (e) {
        var blob = new BlobBuilder();
        blob.append(str);
        return URL.createObjectURL(blob.getBlob(type));
    }
}

function wrapTerminate(worker, objURL) {
    if (!worker || !objURL) return;
    var term = worker.terminate;
    worker.objURL = objURL;
    worker.terminate = function () {
        if (worker.objURL) URL.revokeObjectURL(worker.objURL);
        term.call(worker);
    };
}

var TransmuxWorker = new shimWorker("./transmuxer-worker.worker.js", function (window, document$$1) {
  var self = this;
  var transmuxerWorker = function () {

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     *
     * A lightweight readable stream implemention that handles event dispatching.
     * Objects that inherit from streams should call init in their constructors.
     */

    var Stream = function Stream() {
      this.init = function () {
        var listeners = {};
        /**
         * Add a listener for a specified event type.
         * @param type {string} the event name
         * @param listener {function} the callback to be invoked when an event of
         * the specified type occurs
         */
        this.on = function (type, listener) {
          if (!listeners[type]) {
            listeners[type] = [];
          }
          listeners[type] = listeners[type].concat(listener);
        };
        /**
         * Remove a listener for a specified event type.
         * @param type {string} the event name
         * @param listener {function} a function previously registered for this
         * type of event through `on`
         */
        this.off = function (type, listener) {
          var index;
          if (!listeners[type]) {
            return false;
          }
          index = listeners[type].indexOf(listener);
          listeners[type] = listeners[type].slice();
          listeners[type].splice(index, 1);
          return index > -1;
        };
        /**
         * Trigger an event of the specified type on this stream. Any additional
         * arguments to this function are passed as parameters to event listeners.
         * @param type {string} the event name
         */
        this.trigger = function (type) {
          var callbacks, i, length, args;
          callbacks = listeners[type];
          if (!callbacks) {
            return;
          }
          // Slicing the arguments on every invocation of this method
          // can add a significant amount of overhead. Avoid the
          // intermediate object creation for the common case of a
          // single callback argument
          if (arguments.length === 2) {
            length = callbacks.length;
            for (i = 0; i < length; ++i) {
              callbacks[i].call(this, arguments[1]);
            }
          } else {
            args = [];
            i = arguments.length;
            for (i = 1; i < arguments.length; ++i) {
              args.push(arguments[i]);
            }
            length = callbacks.length;
            for (i = 0; i < length; ++i) {
              callbacks[i].apply(this, args);
            }
          }
        };
        /**
         * Destroys the stream and cleans up.
         */
        this.dispose = function () {
          listeners = {};
        };
      };
    };

    /**
     * Forwards all `data` events on this stream to the destination stream. The
     * destination stream should provide a method `push` to receive the data
     * events as they arrive.
     * @param destination {stream} the stream that will receive all `data` events
     * @param autoFlush {boolean} if false, we will not call `flush` on the destination
     *                            when the current stream emits a 'done' event
     * @see http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options
     */
    Stream.prototype.pipe = function (destination) {
      this.on('data', function (data) {
        destination.push(data);
      });

      this.on('done', function (flushSource) {
        destination.flush(flushSource);
      });

      this.on('partialdone', function (flushSource) {
        destination.partialFlush(flushSource);
      });

      this.on('endedtimeline', function (flushSource) {
        destination.endTimeline(flushSource);
      });

      this.on('reset', function (flushSource) {
        destination.reset(flushSource);
      });

      return destination;
    };

    // Default stream functions that are expected to be overridden to perform
    // actual work. These are provided by the prototype as a sort of no-op
    // implementation so that we don't have to check for their existence in the
    // `pipe` function above.
    Stream.prototype.push = function (data) {
      this.trigger('data', data);
    };

    Stream.prototype.flush = function (flushSource) {
      this.trigger('done', flushSource);
    };

    Stream.prototype.partialFlush = function (flushSource) {
      this.trigger('partialdone', flushSource);
    };

    Stream.prototype.endTimeline = function (flushSource) {
      this.trigger('endedtimeline', flushSource);
    };

    Stream.prototype.reset = function (flushSource) {
      this.trigger('reset', flushSource);
    };

    var stream = Stream;

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     *
     * Functions that generate fragmented MP4s suitable for use with Media
     * Source Extensions.
     */

    var UINT32_MAX = Math.pow(2, 32) - 1;

    var box, dinf, esds, ftyp, mdat, mfhd, minf, moof, moov, mvex, mvhd, trak, tkhd, mdia, mdhd, hdlr, sdtp, stbl, stsd, traf, trex, trun, types, MAJOR_BRAND, MINOR_VERSION, AVC1_BRAND, VIDEO_HDLR, AUDIO_HDLR, HDLR_TYPES, VMHD, SMHD, DREF, STCO, STSC, STSZ, STTS;

    // pre-calculate constants
    (function () {
      var i;
      types = {
        avc1: [], // codingname
        avcC: [],
        btrt: [],
        dinf: [],
        dref: [],
        esds: [],
        ftyp: [],
        hdlr: [],
        mdat: [],
        mdhd: [],
        mdia: [],
        mfhd: [],
        minf: [],
        moof: [],
        moov: [],
        mp4a: [], // codingname
        mvex: [],
        mvhd: [],
        pasp: [],
        sdtp: [],
        smhd: [],
        stbl: [],
        stco: [],
        stsc: [],
        stsd: [],
        stsz: [],
        stts: [],
        styp: [],
        tfdt: [],
        tfhd: [],
        traf: [],
        trak: [],
        trun: [],
        trex: [],
        tkhd: [],
        vmhd: []
      };

      // In environments where Uint8Array is undefined (e.g., IE8), skip set up so that we
      // don't throw an error
      if (typeof Uint8Array === 'undefined') {
        return;
      }

      for (i in types) {
        if (types.hasOwnProperty(i)) {
          types[i] = [i.charCodeAt(0), i.charCodeAt(1), i.charCodeAt(2), i.charCodeAt(3)];
        }
      }

      MAJOR_BRAND = new Uint8Array(['i'.charCodeAt(0), 's'.charCodeAt(0), 'o'.charCodeAt(0), 'm'.charCodeAt(0)]);
      AVC1_BRAND = new Uint8Array(['a'.charCodeAt(0), 'v'.charCodeAt(0), 'c'.charCodeAt(0), '1'.charCodeAt(0)]);
      MINOR_VERSION = new Uint8Array([0, 0, 0, 1]);
      VIDEO_HDLR = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x00, // pre_defined
      0x76, 0x69, 0x64, 0x65, // handler_type: 'vide'
      0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x00, 0x00, 0x00, // reserved
      0x56, 0x69, 0x64, 0x65, 0x6f, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'VideoHandler'
      ]);
      AUDIO_HDLR = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x00, // pre_defined
      0x73, 0x6f, 0x75, 0x6e, // handler_type: 'soun'
      0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x00, 0x00, 0x00, // reserved
      0x53, 0x6f, 0x75, 0x6e, 0x64, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'SoundHandler'
      ]);
      HDLR_TYPES = {
        video: VIDEO_HDLR,
        audio: AUDIO_HDLR
      };
      DREF = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x01, // entry_count
      0x00, 0x00, 0x00, 0x0c, // entry_size
      0x75, 0x72, 0x6c, 0x20, // 'url' type
      0x00, // version 0
      0x00, 0x00, 0x01 // entry_flags
      ]);
      SMHD = new Uint8Array([0x00, // version
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, // balance, 0 means centered
      0x00, 0x00 // reserved
      ]);
      STCO = new Uint8Array([0x00, // version
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x00 // entry_count
      ]);
      STSC = STCO;
      STSZ = new Uint8Array([0x00, // version
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x00, // sample_size
      0x00, 0x00, 0x00, 0x00 // sample_count
      ]);
      STTS = STCO;
      VMHD = new Uint8Array([0x00, // version
      0x00, 0x00, 0x01, // flags
      0x00, 0x00, // graphicsmode
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // opcolor
      ]);
    })();

    box = function box(type) {
      var payload = [],
          size = 0,
          i,
          result,
          view;

      for (i = 1; i < arguments.length; i++) {
        payload.push(arguments[i]);
      }

      i = payload.length;

      // calculate the total size we need to allocate
      while (i--) {
        size += payload[i].byteLength;
      }
      result = new Uint8Array(size + 8);
      view = new DataView(result.buffer, result.byteOffset, result.byteLength);
      view.setUint32(0, result.byteLength);
      result.set(type, 4);

      // copy the payload into the result
      for (i = 0, size = 8; i < payload.length; i++) {
        result.set(payload[i], size);
        size += payload[i].byteLength;
      }
      return result;
    };

    dinf = function dinf() {
      return box(types.dinf, box(types.dref, DREF));
    };

    esds = function esds(track) {
      return box(types.esds, new Uint8Array([0x00, // version
      0x00, 0x00, 0x00, // flags

      // ES_Descriptor
      0x03, // tag, ES_DescrTag
      0x19, // length
      0x00, 0x00, // ES_ID
      0x00, // streamDependenceFlag, URL_flag, reserved, streamPriority

      // DecoderConfigDescriptor
      0x04, // tag, DecoderConfigDescrTag
      0x11, // length
      0x40, // object type
      0x15, // streamType
      0x00, 0x06, 0x00, // bufferSizeDB
      0x00, 0x00, 0xda, 0xc0, // maxBitrate
      0x00, 0x00, 0xda, 0xc0, // avgBitrate

      // DecoderSpecificInfo
      0x05, // tag, DecoderSpecificInfoTag
      0x02, // length
      // ISO/IEC 14496-3, AudioSpecificConfig
      // for samplingFrequencyIndex see ISO/IEC 13818-7:2006, 8.1.3.2.2, Table 35
      track.audioobjecttype << 3 | track.samplingfrequencyindex >>> 1, track.samplingfrequencyindex << 7 | track.channelcount << 3, 0x06, 0x01, 0x02 // GASpecificConfig
      ]));
    };

    ftyp = function ftyp() {
      return box(types.ftyp, MAJOR_BRAND, MINOR_VERSION, MAJOR_BRAND, AVC1_BRAND);
    };

    hdlr = function hdlr(type) {
      return box(types.hdlr, HDLR_TYPES[type]);
    };
    mdat = function mdat(data) {
      return box(types.mdat, data);
    };
    mdhd = function mdhd(track) {
      var result = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x02, // creation_time
      0x00, 0x00, 0x00, 0x03, // modification_time
      0x00, 0x01, 0x5f, 0x90, // timescale, 90,000 "ticks" per second

      track.duration >>> 24 & 0xFF, track.duration >>> 16 & 0xFF, track.duration >>> 8 & 0xFF, track.duration & 0xFF, // duration
      0x55, 0xc4, // 'und' language (undetermined)
      0x00, 0x00]);

      // Use the sample rate from the track metadata, when it is
      // defined. The sample rate can be parsed out of an ADTS header, for
      // instance.
      if (track.samplerate) {
        result[12] = track.samplerate >>> 24 & 0xFF;
        result[13] = track.samplerate >>> 16 & 0xFF;
        result[14] = track.samplerate >>> 8 & 0xFF;
        result[15] = track.samplerate & 0xFF;
      }

      return box(types.mdhd, result);
    };
    mdia = function mdia(track) {
      return box(types.mdia, mdhd(track), hdlr(track.type), minf(track));
    };
    mfhd = function mfhd(sequenceNumber) {
      return box(types.mfhd, new Uint8Array([0x00, 0x00, 0x00, 0x00, // flags
      (sequenceNumber & 0xFF000000) >> 24, (sequenceNumber & 0xFF0000) >> 16, (sequenceNumber & 0xFF00) >> 8, sequenceNumber & 0xFF // sequence_number
      ]));
    };
    minf = function minf(track) {
      return box(types.minf, track.type === 'video' ? box(types.vmhd, VMHD) : box(types.smhd, SMHD), dinf(), stbl(track));
    };
    moof = function moof(sequenceNumber, tracks) {
      var trackFragments = [],
          i = tracks.length;
      // build traf boxes for each track fragment
      while (i--) {
        trackFragments[i] = traf(tracks[i]);
      }
      return box.apply(null, [types.moof, mfhd(sequenceNumber)].concat(trackFragments));
    };
    /**
     * Returns a movie box.
     * @param tracks {array} the tracks associated with this movie
     * @see ISO/IEC 14496-12:2012(E), section 8.2.1
     */
    moov = function moov(tracks) {
      var i = tracks.length,
          boxes = [];

      while (i--) {
        boxes[i] = trak(tracks[i]);
      }

      return box.apply(null, [types.moov, mvhd(0xffffffff)].concat(boxes).concat(mvex(tracks)));
    };
    mvex = function mvex(tracks) {
      var i = tracks.length,
          boxes = [];

      while (i--) {
        boxes[i] = trex(tracks[i]);
      }
      return box.apply(null, [types.mvex].concat(boxes));
    };
    mvhd = function mvhd(duration) {
      var bytes = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x00, // flags
      0x00, 0x00, 0x00, 0x01, // creation_time
      0x00, 0x00, 0x00, 0x02, // modification_time
      0x00, 0x01, 0x5f, 0x90, // timescale, 90,000 "ticks" per second
      (duration & 0xFF000000) >> 24, (duration & 0xFF0000) >> 16, (duration & 0xFF00) >> 8, duration & 0xFF, // duration
      0x00, 0x01, 0x00, 0x00, // 1.0 rate
      0x01, 0x00, // 1.0 volume
      0x00, 0x00, // reserved
      0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, // transformation: unity matrix
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // pre_defined
      0xff, 0xff, 0xff, 0xff // next_track_ID
      ]);
      return box(types.mvhd, bytes);
    };

    sdtp = function sdtp(track) {
      var samples = track.samples || [],
          bytes = new Uint8Array(4 + samples.length),
          flags,
          i;

      // leave the full box header (4 bytes) all zero

      // write the sample table
      for (i = 0; i < samples.length; i++) {
        flags = samples[i].flags;

        bytes[i + 4] = flags.dependsOn << 4 | flags.isDependedOn << 2 | flags.hasRedundancy;
      }

      return box(types.sdtp, bytes);
    };

    stbl = function stbl(track) {
      return box(types.stbl, stsd(track), box(types.stts, STTS), box(types.stsc, STSC), box(types.stsz, STSZ), box(types.stco, STCO));
    };

    (function () {
      var videoSample, audioSample;

      stsd = function stsd(track) {

        return box(types.stsd, new Uint8Array([0x00, // version 0
        0x00, 0x00, 0x00, // flags
        0x00, 0x00, 0x00, 0x01]), track.type === 'video' ? videoSample(track) : audioSample(track));
      };

      videoSample = function videoSample(track) {
        var sps = track.sps || [],
            pps = track.pps || [],
            sequenceParameterSets = [],
            pictureParameterSets = [],
            i,
            avc1Box;

        // assemble the SPSs
        for (i = 0; i < sps.length; i++) {
          sequenceParameterSets.push((sps[i].byteLength & 0xFF00) >>> 8);
          sequenceParameterSets.push(sps[i].byteLength & 0xFF); // sequenceParameterSetLength
          sequenceParameterSets = sequenceParameterSets.concat(Array.prototype.slice.call(sps[i])); // SPS
        }

        // assemble the PPSs
        for (i = 0; i < pps.length; i++) {
          pictureParameterSets.push((pps[i].byteLength & 0xFF00) >>> 8);
          pictureParameterSets.push(pps[i].byteLength & 0xFF);
          pictureParameterSets = pictureParameterSets.concat(Array.prototype.slice.call(pps[i]));
        }

        avc1Box = [types.avc1, new Uint8Array([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
        0x00, 0x01, // data_reference_index
        0x00, 0x00, // pre_defined
        0x00, 0x00, // reserved
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // pre_defined
        (track.width & 0xff00) >> 8, track.width & 0xff, // width
        (track.height & 0xff00) >> 8, track.height & 0xff, // height
        0x00, 0x48, 0x00, 0x00, // horizresolution
        0x00, 0x48, 0x00, 0x00, // vertresolution
        0x00, 0x00, 0x00, 0x00, // reserved
        0x00, 0x01, // frame_count
        0x13, 0x76, 0x69, 0x64, 0x65, 0x6f, 0x6a, 0x73, 0x2d, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x69, 0x62, 0x2d, 0x68, 0x6c, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // compressorname
        0x00, 0x18, // depth = 24
        0x11, 0x11 // pre_defined = -1
        ]), box(types.avcC, new Uint8Array([0x01, // configurationVersion
        track.profileIdc, // AVCProfileIndication
        track.profileCompatibility, // profile_compatibility
        track.levelIdc, // AVCLevelIndication
        0xff // lengthSizeMinusOne, hard-coded to 4 bytes
        ].concat([sps.length], // numOfSequenceParameterSets
        sequenceParameterSets, // "SPS"
        [pps.length], // numOfPictureParameterSets
        pictureParameterSets // "PPS"
        ))), box(types.btrt, new Uint8Array([0x00, 0x1c, 0x9c, 0x80, // bufferSizeDB
        0x00, 0x2d, 0xc6, 0xc0, // maxBitrate
        0x00, 0x2d, 0xc6, 0xc0 // avgBitrate
        ]))];

        if (track.sarRatio) {
          var hSpacing = track.sarRatio[0],
              vSpacing = track.sarRatio[1];

          avc1Box.push(box(types.pasp, new Uint8Array([(hSpacing & 0xFF000000) >> 24, (hSpacing & 0xFF0000) >> 16, (hSpacing & 0xFF00) >> 8, hSpacing & 0xFF, (vSpacing & 0xFF000000) >> 24, (vSpacing & 0xFF0000) >> 16, (vSpacing & 0xFF00) >> 8, vSpacing & 0xFF])));
        }

        return box.apply(null, avc1Box);
      };

      audioSample = function audioSample(track) {
        return box(types.mp4a, new Uint8Array([

        // SampleEntry, ISO/IEC 14496-12
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
        0x00, 0x01, // data_reference_index

        // AudioSampleEntry, ISO/IEC 14496-12
        0x00, 0x00, 0x00, 0x00, // reserved
        0x00, 0x00, 0x00, 0x00, // reserved
        (track.channelcount & 0xff00) >> 8, track.channelcount & 0xff, // channelcount

        (track.samplesize & 0xff00) >> 8, track.samplesize & 0xff, // samplesize
        0x00, 0x00, // pre_defined
        0x00, 0x00, // reserved

        (track.samplerate & 0xff00) >> 8, track.samplerate & 0xff, 0x00, 0x00 // samplerate, 16.16

        // MP4AudioSampleEntry, ISO/IEC 14496-14
        ]), esds(track));
      };
    })();

    tkhd = function tkhd(track) {
      var result = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x07, // flags
      0x00, 0x00, 0x00, 0x00, // creation_time
      0x00, 0x00, 0x00, 0x00, // modification_time
      (track.id & 0xFF000000) >> 24, (track.id & 0xFF0000) >> 16, (track.id & 0xFF00) >> 8, track.id & 0xFF, // track_ID
      0x00, 0x00, 0x00, 0x00, // reserved
      (track.duration & 0xFF000000) >> 24, (track.duration & 0xFF0000) >> 16, (track.duration & 0xFF00) >> 8, track.duration & 0xFF, // duration
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
      0x00, 0x00, // layer
      0x00, 0x00, // alternate_group
      0x01, 0x00, // non-audio track volume
      0x00, 0x00, // reserved
      0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, // transformation: unity matrix
      (track.width & 0xFF00) >> 8, track.width & 0xFF, 0x00, 0x00, // width
      (track.height & 0xFF00) >> 8, track.height & 0xFF, 0x00, 0x00 // height
      ]);

      return box(types.tkhd, result);
    };

    /**
     * Generate a track fragment (traf) box. A traf box collects metadata
     * about tracks in a movie fragment (moof) box.
     */
    traf = function traf(track) {
      var trackFragmentHeader, trackFragmentDecodeTime, trackFragmentRun, sampleDependencyTable, dataOffset, upperWordBaseMediaDecodeTime, lowerWordBaseMediaDecodeTime;

      trackFragmentHeader = box(types.tfhd, new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x3a, // flags
      (track.id & 0xFF000000) >> 24, (track.id & 0xFF0000) >> 16, (track.id & 0xFF00) >> 8, track.id & 0xFF, // track_ID
      0x00, 0x00, 0x00, 0x01, // sample_description_index
      0x00, 0x00, 0x00, 0x00, // default_sample_duration
      0x00, 0x00, 0x00, 0x00, // default_sample_size
      0x00, 0x00, 0x00, 0x00 // default_sample_flags
      ]));

      upperWordBaseMediaDecodeTime = Math.floor(track.baseMediaDecodeTime / (UINT32_MAX + 1));
      lowerWordBaseMediaDecodeTime = Math.floor(track.baseMediaDecodeTime % (UINT32_MAX + 1));

      trackFragmentDecodeTime = box(types.tfdt, new Uint8Array([0x01, // version 1
      0x00, 0x00, 0x00, // flags
      // baseMediaDecodeTime
      upperWordBaseMediaDecodeTime >>> 24 & 0xFF, upperWordBaseMediaDecodeTime >>> 16 & 0xFF, upperWordBaseMediaDecodeTime >>> 8 & 0xFF, upperWordBaseMediaDecodeTime & 0xFF, lowerWordBaseMediaDecodeTime >>> 24 & 0xFF, lowerWordBaseMediaDecodeTime >>> 16 & 0xFF, lowerWordBaseMediaDecodeTime >>> 8 & 0xFF, lowerWordBaseMediaDecodeTime & 0xFF]));

      // the data offset specifies the number of bytes from the start of
      // the containing moof to the first payload byte of the associated
      // mdat
      dataOffset = 32 + // tfhd
      20 + // tfdt
      8 + // traf header
      16 + // mfhd
      8 + // moof header
      8; // mdat header

      // audio tracks require less metadata
      if (track.type === 'audio') {
        trackFragmentRun = trun(track, dataOffset);
        return box(types.traf, trackFragmentHeader, trackFragmentDecodeTime, trackFragmentRun);
      }

      // video tracks should contain an independent and disposable samples
      // box (sdtp)
      // generate one and adjust offsets to match
      sampleDependencyTable = sdtp(track);
      trackFragmentRun = trun(track, sampleDependencyTable.length + dataOffset);
      return box(types.traf, trackFragmentHeader, trackFragmentDecodeTime, trackFragmentRun, sampleDependencyTable);
    };

    /**
     * Generate a track box.
     * @param track {object} a track definition
     * @return {Uint8Array} the track box
     */
    trak = function trak(track) {
      track.duration = track.duration || 0xffffffff;
      return box(types.trak, tkhd(track), mdia(track));
    };

    trex = function trex(track) {
      var result = new Uint8Array([0x00, // version 0
      0x00, 0x00, 0x00, // flags
      (track.id & 0xFF000000) >> 24, (track.id & 0xFF0000) >> 16, (track.id & 0xFF00) >> 8, track.id & 0xFF, // track_ID
      0x00, 0x00, 0x00, 0x01, // default_sample_description_index
      0x00, 0x00, 0x00, 0x00, // default_sample_duration
      0x00, 0x00, 0x00, 0x00, // default_sample_size
      0x00, 0x01, 0x00, 0x01 // default_sample_flags
      ]);
      // the last two bytes of default_sample_flags is the sample
      // degradation priority, a hint about the importance of this sample
      // relative to others. Lower the degradation priority for all sample
      // types other than video.
      if (track.type !== 'video') {
        result[result.length - 1] = 0x00;
      }

      return box(types.trex, result);
    };

    (function () {
      var audioTrun, videoTrun, trunHeader;

      // This method assumes all samples are uniform. That is, if a
      // duration is present for the first sample, it will be present for
      // all subsequent samples.
      // see ISO/IEC 14496-12:2012, Section 8.8.8.1
      trunHeader = function trunHeader(samples, offset) {
        var durationPresent = 0,
            sizePresent = 0,
            flagsPresent = 0,
            compositionTimeOffset = 0;

        // trun flag constants
        if (samples.length) {
          if (samples[0].duration !== undefined) {
            durationPresent = 0x1;
          }
          if (samples[0].size !== undefined) {
            sizePresent = 0x2;
          }
          if (samples[0].flags !== undefined) {
            flagsPresent = 0x4;
          }
          if (samples[0].compositionTimeOffset !== undefined) {
            compositionTimeOffset = 0x8;
          }
        }

        return [0x00, // version 0
        0x00, durationPresent | sizePresent | flagsPresent | compositionTimeOffset, 0x01, // flags
        (samples.length & 0xFF000000) >>> 24, (samples.length & 0xFF0000) >>> 16, (samples.length & 0xFF00) >>> 8, samples.length & 0xFF, // sample_count
        (offset & 0xFF000000) >>> 24, (offset & 0xFF0000) >>> 16, (offset & 0xFF00) >>> 8, offset & 0xFF // data_offset
        ];
      };

      videoTrun = function videoTrun(track, offset) {
        var bytes, samples, sample, i;

        samples = track.samples || [];
        offset += 8 + 12 + 16 * samples.length;

        bytes = trunHeader(samples, offset);

        for (i = 0; i < samples.length; i++) {
          sample = samples[i];
          bytes = bytes.concat([(sample.duration & 0xFF000000) >>> 24, (sample.duration & 0xFF0000) >>> 16, (sample.duration & 0xFF00) >>> 8, sample.duration & 0xFF, // sample_duration
          (sample.size & 0xFF000000) >>> 24, (sample.size & 0xFF0000) >>> 16, (sample.size & 0xFF00) >>> 8, sample.size & 0xFF, // sample_size
          sample.flags.isLeading << 2 | sample.flags.dependsOn, sample.flags.isDependedOn << 6 | sample.flags.hasRedundancy << 4 | sample.flags.paddingValue << 1 | sample.flags.isNonSyncSample, sample.flags.degradationPriority & 0xF0 << 8, sample.flags.degradationPriority & 0x0F, // sample_flags
          (sample.compositionTimeOffset & 0xFF000000) >>> 24, (sample.compositionTimeOffset & 0xFF0000) >>> 16, (sample.compositionTimeOffset & 0xFF00) >>> 8, sample.compositionTimeOffset & 0xFF // sample_composition_time_offset
          ]);
        }
        return box(types.trun, new Uint8Array(bytes));
      };

      audioTrun = function audioTrun(track, offset) {
        var bytes, samples, sample, i;

        samples = track.samples || [];
        offset += 8 + 12 + 8 * samples.length;

        bytes = trunHeader(samples, offset);

        for (i = 0; i < samples.length; i++) {
          sample = samples[i];
          bytes = bytes.concat([(sample.duration & 0xFF000000) >>> 24, (sample.duration & 0xFF0000) >>> 16, (sample.duration & 0xFF00) >>> 8, sample.duration & 0xFF, // sample_duration
          (sample.size & 0xFF000000) >>> 24, (sample.size & 0xFF0000) >>> 16, (sample.size & 0xFF00) >>> 8, sample.size & 0xFF]); // sample_size
        }

        return box(types.trun, new Uint8Array(bytes));
      };

      trun = function trun(track, offset) {
        if (track.type === 'audio') {
          return audioTrun(track, offset);
        }

        return videoTrun(track, offset);
      };
    })();

    var mp4Generator = {
      ftyp: ftyp,
      mdat: mdat,
      moof: moof,
      moov: moov,
      initSegment: function initSegment(tracks) {
        var fileType = ftyp(),
            movie = moov(tracks),
            result;

        result = new Uint8Array(fileType.byteLength + movie.byteLength);
        result.set(fileType);
        result.set(movie, fileType.byteLength);
        return result;
      }
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */
    // Convert an array of nal units into an array of frames with each frame being
    // composed of the nal units that make up that frame
    // Also keep track of cummulative data about the frame from the nal units such
    // as the frame duration, starting pts, etc.
    var groupNalsIntoFrames = function groupNalsIntoFrames(nalUnits) {
      var i,
          currentNal,
          currentFrame = [],
          frames = [];

      // TODO added for LHLS, make sure this is OK
      frames.byteLength = 0;
      frames.nalCount = 0;
      frames.duration = 0;

      currentFrame.byteLength = 0;

      for (i = 0; i < nalUnits.length; i++) {
        currentNal = nalUnits[i];

        // Split on 'aud'-type nal units
        if (currentNal.nalUnitType === 'access_unit_delimiter_rbsp') {
          // Since the very first nal unit is expected to be an AUD
          // only push to the frames array when currentFrame is not empty
          if (currentFrame.length) {
            currentFrame.duration = currentNal.dts - currentFrame.dts;
            // TODO added for LHLS, make sure this is OK
            frames.byteLength += currentFrame.byteLength;
            frames.nalCount += currentFrame.length;
            frames.duration += currentFrame.duration;
            frames.push(currentFrame);
          }
          currentFrame = [currentNal];
          currentFrame.byteLength = currentNal.data.byteLength;
          currentFrame.pts = currentNal.pts;
          currentFrame.dts = currentNal.dts;
        } else {
          // Specifically flag key frames for ease of use later
          if (currentNal.nalUnitType === 'slice_layer_without_partitioning_rbsp_idr') {
            currentFrame.keyFrame = true;
          }
          currentFrame.duration = currentNal.dts - currentFrame.dts;
          currentFrame.byteLength += currentNal.data.byteLength;
          currentFrame.push(currentNal);
        }
      }

      // For the last frame, use the duration of the previous frame if we
      // have nothing better to go on
      if (frames.length && (!currentFrame.duration || currentFrame.duration <= 0)) {
        currentFrame.duration = frames[frames.length - 1].duration;
      }

      // Push the final frame
      // TODO added for LHLS, make sure this is OK
      frames.byteLength += currentFrame.byteLength;
      frames.nalCount += currentFrame.length;
      frames.duration += currentFrame.duration;

      frames.push(currentFrame);
      return frames;
    };

    // Convert an array of frames into an array of Gop with each Gop being composed
    // of the frames that make up that Gop
    // Also keep track of cummulative data about the Gop from the frames such as the
    // Gop duration, starting pts, etc.
    var groupFramesIntoGops = function groupFramesIntoGops(frames) {
      var i,
          currentFrame,
          currentGop = [],
          gops = [];

      // We must pre-set some of the values on the Gop since we
      // keep running totals of these values
      currentGop.byteLength = 0;
      currentGop.nalCount = 0;
      currentGop.duration = 0;
      currentGop.pts = frames[0].pts;
      currentGop.dts = frames[0].dts;

      // store some metadata about all the Gops
      gops.byteLength = 0;
      gops.nalCount = 0;
      gops.duration = 0;
      gops.pts = frames[0].pts;
      gops.dts = frames[0].dts;

      for (i = 0; i < frames.length; i++) {
        currentFrame = frames[i];

        if (currentFrame.keyFrame) {
          // Since the very first frame is expected to be an keyframe
          // only push to the gops array when currentGop is not empty
          if (currentGop.length) {
            gops.push(currentGop);
            gops.byteLength += currentGop.byteLength;
            gops.nalCount += currentGop.nalCount;
            gops.duration += currentGop.duration;
          }

          currentGop = [currentFrame];
          currentGop.nalCount = currentFrame.length;
          currentGop.byteLength = currentFrame.byteLength;
          currentGop.pts = currentFrame.pts;
          currentGop.dts = currentFrame.dts;
          currentGop.duration = currentFrame.duration;
        } else {
          currentGop.duration += currentFrame.duration;
          currentGop.nalCount += currentFrame.length;
          currentGop.byteLength += currentFrame.byteLength;
          currentGop.push(currentFrame);
        }
      }

      if (gops.length && currentGop.duration <= 0) {
        currentGop.duration = gops[gops.length - 1].duration;
      }
      gops.byteLength += currentGop.byteLength;
      gops.nalCount += currentGop.nalCount;
      gops.duration += currentGop.duration;

      // push the final Gop
      gops.push(currentGop);
      return gops;
    };

    /*
     * Search for the first keyframe in the GOPs and throw away all frames
     * until that keyframe. Then extend the duration of the pulled keyframe
     * and pull the PTS and DTS of the keyframe so that it covers the time
     * range of the frames that were disposed.
     *
     * @param {Array} gops video GOPs
     * @returns {Array} modified video GOPs
     */
    var extendFirstKeyFrame = function extendFirstKeyFrame(gops) {
      var currentGop;

      if (!gops[0][0].keyFrame && gops.length > 1) {
        // Remove the first GOP
        currentGop = gops.shift();

        gops.byteLength -= currentGop.byteLength;
        gops.nalCount -= currentGop.nalCount;

        // Extend the first frame of what is now the
        // first gop to cover the time period of the
        // frames we just removed
        gops[0][0].dts = currentGop.dts;
        gops[0][0].pts = currentGop.pts;
        gops[0][0].duration += currentGop.duration;
      }

      return gops;
    };

    /**
     * Default sample object
     * see ISO/IEC 14496-12:2012, section 8.6.4.3
     */
    var createDefaultSample = function createDefaultSample() {
      return {
        size: 0,
        flags: {
          isLeading: 0,
          dependsOn: 1,
          isDependedOn: 0,
          hasRedundancy: 0,
          degradationPriority: 0,
          isNonSyncSample: 1
        }
      };
    };

    /*
     * Collates information from a video frame into an object for eventual
     * entry into an MP4 sample table.
     *
     * @param {Object} frame the video frame
     * @param {Number} dataOffset the byte offset to position the sample
     * @return {Object} object containing sample table info for a frame
     */
    var sampleForFrame = function sampleForFrame(frame, dataOffset) {
      var sample = createDefaultSample();

      sample.dataOffset = dataOffset;
      sample.compositionTimeOffset = frame.pts - frame.dts;
      sample.duration = frame.duration;
      sample.size = 4 * frame.length; // Space for nal unit size
      sample.size += frame.byteLength;

      if (frame.keyFrame) {
        sample.flags.dependsOn = 2;
        sample.flags.isNonSyncSample = 0;
      }

      return sample;
    };

    // generate the track's sample table from an array of gops
    var generateSampleTable = function generateSampleTable(gops, baseDataOffset) {
      var h,
          i,
          sample,
          currentGop,
          currentFrame,
          dataOffset = baseDataOffset || 0,
          samples = [];

      for (h = 0; h < gops.length; h++) {
        currentGop = gops[h];

        for (i = 0; i < currentGop.length; i++) {
          currentFrame = currentGop[i];

          sample = sampleForFrame(currentFrame, dataOffset);

          dataOffset += sample.size;

          samples.push(sample);
        }
      }
      return samples;
    };

    // generate the track's raw mdat data from an array of gops
    var concatenateNalData = function concatenateNalData(gops) {
      var h,
          i,
          j,
          currentGop,
          currentFrame,
          currentNal,
          dataOffset = 0,
          nalsByteLength = gops.byteLength,
          numberOfNals = gops.nalCount,
          totalByteLength = nalsByteLength + 4 * numberOfNals,
          data = new Uint8Array(totalByteLength),
          view = new DataView(data.buffer);

      // For each Gop..
      for (h = 0; h < gops.length; h++) {
        currentGop = gops[h];

        // For each Frame..
        for (i = 0; i < currentGop.length; i++) {
          currentFrame = currentGop[i];

          // For each NAL..
          for (j = 0; j < currentFrame.length; j++) {
            currentNal = currentFrame[j];

            view.setUint32(dataOffset, currentNal.data.byteLength);
            dataOffset += 4;
            data.set(currentNal.data, dataOffset);
            dataOffset += currentNal.data.byteLength;
          }
        }
      }
      return data;
    };

    // generate the track's sample table from a frame
    var generateSampleTableForFrame = function generateSampleTableForFrame(frame, baseDataOffset) {
      var sample,
          dataOffset = baseDataOffset || 0,
          samples = [];

      sample = sampleForFrame(frame, dataOffset);
      samples.push(sample);

      return samples;
    };

    // generate the track's raw mdat data from a frame
    var concatenateNalDataForFrame = function concatenateNalDataForFrame(frame) {
      var i,
          currentNal,
          dataOffset = 0,
          nalsByteLength = frame.byteLength,
          numberOfNals = frame.length,
          totalByteLength = nalsByteLength + 4 * numberOfNals,
          data = new Uint8Array(totalByteLength),
          view = new DataView(data.buffer);

      // For each NAL..
      for (i = 0; i < frame.length; i++) {
        currentNal = frame[i];

        view.setUint32(dataOffset, currentNal.data.byteLength);
        dataOffset += 4;
        data.set(currentNal.data, dataOffset);
        dataOffset += currentNal.data.byteLength;
      }

      return data;
    };

    var frameUtils = {
      groupNalsIntoFrames: groupNalsIntoFrames,
      groupFramesIntoGops: groupFramesIntoGops,
      extendFirstKeyFrame: extendFirstKeyFrame,
      generateSampleTable: generateSampleTable,
      concatenateNalData: concatenateNalData,
      generateSampleTableForFrame: generateSampleTableForFrame,
      concatenateNalDataForFrame: concatenateNalDataForFrame
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */
    var highPrefix = [33, 16, 5, 32, 164, 27];
    var lowPrefix = [33, 65, 108, 84, 1, 2, 4, 8, 168, 2, 4, 8, 17, 191, 252];
    var zeroFill = function zeroFill(count) {
      var a = [];
      while (count--) {
        a.push(0);
      }
      return a;
    };

    var makeTable = function makeTable(metaTable) {
      return Object.keys(metaTable).reduce(function (obj, key) {
        obj[key] = new Uint8Array(metaTable[key].reduce(function (arr, part) {
          return arr.concat(part);
        }, []));
        return obj;
      }, {});
    };

    // Frames-of-silence to use for filling in missing AAC frames
    var coneOfSilence = {
      96000: [highPrefix, [227, 64], zeroFill(154), [56]],
      88200: [highPrefix, [231], zeroFill(170), [56]],
      64000: [highPrefix, [248, 192], zeroFill(240), [56]],
      48000: [highPrefix, [255, 192], zeroFill(268), [55, 148, 128], zeroFill(54), [112]],
      44100: [highPrefix, [255, 192], zeroFill(268), [55, 163, 128], zeroFill(84), [112]],
      32000: [highPrefix, [255, 192], zeroFill(268), [55, 234], zeroFill(226), [112]],
      24000: [highPrefix, [255, 192], zeroFill(268), [55, 255, 128], zeroFill(268), [111, 112], zeroFill(126), [224]],
      16000: [highPrefix, [255, 192], zeroFill(268), [55, 255, 128], zeroFill(268), [111, 255], zeroFill(269), [223, 108], zeroFill(195), [1, 192]],
      12000: [lowPrefix, zeroFill(268), [3, 127, 248], zeroFill(268), [6, 255, 240], zeroFill(268), [13, 255, 224], zeroFill(268), [27, 253, 128], zeroFill(259), [56]],
      11025: [lowPrefix, zeroFill(268), [3, 127, 248], zeroFill(268), [6, 255, 240], zeroFill(268), [13, 255, 224], zeroFill(268), [27, 255, 192], zeroFill(268), [55, 175, 128], zeroFill(108), [112]],
      8000: [lowPrefix, zeroFill(268), [3, 121, 16], zeroFill(47), [7]]
    };

    var silence = makeTable(coneOfSilence);

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */
    var ONE_SECOND_IN_TS = 90000,

    // 90kHz clock
    secondsToVideoTs,
        secondsToAudioTs,
        videoTsToSeconds,
        audioTsToSeconds,
        audioTsToVideoTs,
        videoTsToAudioTs,
        metadataTsToSeconds;

    secondsToVideoTs = function secondsToVideoTs(seconds) {
      return seconds * ONE_SECOND_IN_TS;
    };

    secondsToAudioTs = function secondsToAudioTs(seconds, sampleRate) {
      return seconds * sampleRate;
    };

    videoTsToSeconds = function videoTsToSeconds(timestamp) {
      return timestamp / ONE_SECOND_IN_TS;
    };

    audioTsToSeconds = function audioTsToSeconds(timestamp, sampleRate) {
      return timestamp / sampleRate;
    };

    audioTsToVideoTs = function audioTsToVideoTs(timestamp, sampleRate) {
      return secondsToVideoTs(audioTsToSeconds(timestamp, sampleRate));
    };

    videoTsToAudioTs = function videoTsToAudioTs(timestamp, sampleRate) {
      return secondsToAudioTs(videoTsToSeconds(timestamp), sampleRate);
    };

    /**
     * Adjust ID3 tag or caption timing information by the timeline pts values
     * (if keepOriginalTimestamps is false) and convert to seconds
     */
    metadataTsToSeconds = function metadataTsToSeconds(timestamp, timelineStartPts, keepOriginalTimestamps) {
      return videoTsToSeconds(keepOriginalTimestamps ? timestamp : timestamp - timelineStartPts);
    };

    var clock = {
      ONE_SECOND_IN_TS: ONE_SECOND_IN_TS,
      secondsToVideoTs: secondsToVideoTs,
      secondsToAudioTs: secondsToAudioTs,
      videoTsToSeconds: videoTsToSeconds,
      audioTsToSeconds: audioTsToSeconds,
      audioTsToVideoTs: audioTsToVideoTs,
      videoTsToAudioTs: videoTsToAudioTs,
      metadataTsToSeconds: metadataTsToSeconds
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */

    /**
     * Sum the `byteLength` properties of the data in each AAC frame
     */
    var sumFrameByteLengths = function sumFrameByteLengths(array) {
      var i,
          currentObj,
          sum = 0;

      // sum the byteLength's all each nal unit in the frame
      for (i = 0; i < array.length; i++) {
        currentObj = array[i];
        sum += currentObj.data.byteLength;
      }

      return sum;
    };

    // Possibly pad (prefix) the audio track with silence if appending this track
    // would lead to the introduction of a gap in the audio buffer
    var prefixWithSilence = function prefixWithSilence(track, frames, audioAppendStartTs, videoBaseMediaDecodeTime) {
      var baseMediaDecodeTimeTs,
          frameDuration = 0,
          audioGapDuration = 0,
          audioFillFrameCount = 0,
          audioFillDuration = 0,
          silentFrame,
          i,
          firstFrame;

      if (!frames.length) {
        return;
      }

      baseMediaDecodeTimeTs = clock.audioTsToVideoTs(track.baseMediaDecodeTime, track.samplerate);
      // determine frame clock duration based on sample rate, round up to avoid overfills
      frameDuration = Math.ceil(clock.ONE_SECOND_IN_TS / (track.samplerate / 1024));

      if (audioAppendStartTs && videoBaseMediaDecodeTime) {
        // insert the shortest possible amount (audio gap or audio to video gap)
        audioGapDuration = baseMediaDecodeTimeTs - Math.max(audioAppendStartTs, videoBaseMediaDecodeTime);
        // number of full frames in the audio gap
        audioFillFrameCount = Math.floor(audioGapDuration / frameDuration);
        audioFillDuration = audioFillFrameCount * frameDuration;
      }

      // don't attempt to fill gaps smaller than a single frame or larger
      // than a half second
      if (audioFillFrameCount < 1 || audioFillDuration > clock.ONE_SECOND_IN_TS / 2) {
        return;
      }

      silentFrame = silence[track.samplerate];

      if (!silentFrame) {
        // we don't have a silent frame pregenerated for the sample rate, so use a frame
        // from the content instead
        silentFrame = frames[0].data;
      }

      for (i = 0; i < audioFillFrameCount; i++) {
        firstFrame = frames[0];

        frames.splice(0, 0, {
          data: silentFrame,
          dts: firstFrame.dts - frameDuration,
          pts: firstFrame.pts - frameDuration
        });
      }

      track.baseMediaDecodeTime -= Math.floor(clock.videoTsToAudioTs(audioFillDuration, track.samplerate));
    };

    // If the audio segment extends before the earliest allowed dts
    // value, remove AAC frames until starts at or after the earliest
    // allowed DTS so that we don't end up with a negative baseMedia-
    // DecodeTime for the audio track
    var trimAdtsFramesByEarliestDts = function trimAdtsFramesByEarliestDts(adtsFrames, track, earliestAllowedDts) {
      if (track.minSegmentDts >= earliestAllowedDts) {
        return adtsFrames;
      }

      // We will need to recalculate the earliest segment Dts
      track.minSegmentDts = Infinity;

      return adtsFrames.filter(function (currentFrame) {
        // If this is an allowed frame, keep it and record it's Dts
        if (currentFrame.dts >= earliestAllowedDts) {
          track.minSegmentDts = Math.min(track.minSegmentDts, currentFrame.dts);
          track.minSegmentPts = track.minSegmentDts;
          return true;
        }
        // Otherwise, discard it
        return false;
      });
    };

    // generate the track's raw mdat data from an array of frames
    var generateSampleTable$1 = function generateSampleTable(frames) {
      var i,
          currentFrame,
          samples = [];

      for (i = 0; i < frames.length; i++) {
        currentFrame = frames[i];
        samples.push({
          size: currentFrame.data.byteLength,
          duration: 1024 // For AAC audio, all samples contain 1024 samples
        });
      }
      return samples;
    };

    // generate the track's sample table from an array of frames
    var concatenateFrameData = function concatenateFrameData(frames) {
      var i,
          currentFrame,
          dataOffset = 0,
          data = new Uint8Array(sumFrameByteLengths(frames));

      for (i = 0; i < frames.length; i++) {
        currentFrame = frames[i];

        data.set(currentFrame.data, dataOffset);
        dataOffset += currentFrame.data.byteLength;
      }
      return data;
    };

    var audioFrameUtils = {
      prefixWithSilence: prefixWithSilence,
      trimAdtsFramesByEarliestDts: trimAdtsFramesByEarliestDts,
      generateSampleTable: generateSampleTable$1,
      concatenateFrameData: concatenateFrameData
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */
    var ONE_SECOND_IN_TS$1 = clock.ONE_SECOND_IN_TS;

    /**
     * Store information about the start and end of the track and the
     * duration for each frame/sample we process in order to calculate
     * the baseMediaDecodeTime
     */
    var collectDtsInfo = function collectDtsInfo(track, data) {
      if (typeof data.pts === 'number') {
        if (track.timelineStartInfo.pts === undefined) {
          track.timelineStartInfo.pts = data.pts;
        }

        if (track.minSegmentPts === undefined) {
          track.minSegmentPts = data.pts;
        } else {
          track.minSegmentPts = Math.min(track.minSegmentPts, data.pts);
        }

        if (track.maxSegmentPts === undefined) {
          track.maxSegmentPts = data.pts;
        } else {
          track.maxSegmentPts = Math.max(track.maxSegmentPts, data.pts);
        }
      }

      if (typeof data.dts === 'number') {
        if (track.timelineStartInfo.dts === undefined) {
          track.timelineStartInfo.dts = data.dts;
        }

        if (track.minSegmentDts === undefined) {
          track.minSegmentDts = data.dts;
        } else {
          track.minSegmentDts = Math.min(track.minSegmentDts, data.dts);
        }

        if (track.maxSegmentDts === undefined) {
          track.maxSegmentDts = data.dts;
        } else {
          track.maxSegmentDts = Math.max(track.maxSegmentDts, data.dts);
        }
      }
    };

    /**
     * Clear values used to calculate the baseMediaDecodeTime between
     * tracks
     */
    var clearDtsInfo = function clearDtsInfo(track) {
      delete track.minSegmentDts;
      delete track.maxSegmentDts;
      delete track.minSegmentPts;
      delete track.maxSegmentPts;
    };

    /**
     * Calculate the track's baseMediaDecodeTime based on the earliest
     * DTS the transmuxer has ever seen and the minimum DTS for the
     * current track
     * @param track {object} track metadata configuration
     * @param keepOriginalTimestamps {boolean} If true, keep the timestamps
     *        in the source; false to adjust the first segment to start at 0.
     */
    var calculateTrackBaseMediaDecodeTime = function calculateTrackBaseMediaDecodeTime(track, keepOriginalTimestamps) {
      var baseMediaDecodeTime,
          scale,
          minSegmentDts = track.minSegmentDts;

      // Optionally adjust the time so the first segment starts at zero.
      if (!keepOriginalTimestamps) {
        minSegmentDts -= track.timelineStartInfo.dts;
      }

      // track.timelineStartInfo.baseMediaDecodeTime is the location, in time, where
      // we want the start of the first segment to be placed
      baseMediaDecodeTime = track.timelineStartInfo.baseMediaDecodeTime;

      // Add to that the distance this segment is from the very first
      baseMediaDecodeTime += minSegmentDts;

      // baseMediaDecodeTime must not become negative
      baseMediaDecodeTime = Math.max(0, baseMediaDecodeTime);

      if (track.type === 'audio') {
        // Audio has a different clock equal to the sampling_rate so we need to
        // scale the PTS values into the clock rate of the track
        scale = track.samplerate / ONE_SECOND_IN_TS$1;
        baseMediaDecodeTime *= scale;
        baseMediaDecodeTime = Math.floor(baseMediaDecodeTime);
      }

      return baseMediaDecodeTime;
    };

    var trackDecodeInfo = {
      clearDtsInfo: clearDtsInfo,
      calculateTrackBaseMediaDecodeTime: calculateTrackBaseMediaDecodeTime,
      collectDtsInfo: collectDtsInfo
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     *
     * Reads in-band caption information from a video elementary
     * stream. Captions must follow the CEA-708 standard for injection
     * into an MPEG-2 transport streams.
     * @see https://en.wikipedia.org/wiki/CEA-708
     * @see https://www.gpo.gov/fdsys/pkg/CFR-2007-title47-vol1/pdf/CFR-2007-title47-vol1-sec15-119.pdf
     */

    // Supplemental enhancement information (SEI) NAL units have a
    // payload type field to indicate how they are to be
    // interpreted. CEAS-708 caption content is always transmitted with
    // payload type 0x04.

    var USER_DATA_REGISTERED_ITU_T_T35 = 4,
        RBSP_TRAILING_BITS = 128;

    /**
      * Parse a supplemental enhancement information (SEI) NAL unit.
      * Stops parsing once a message of type ITU T T35 has been found.
      *
      * @param bytes {Uint8Array} the bytes of a SEI NAL unit
      * @return {object} the parsed SEI payload
      * @see Rec. ITU-T H.264, 7.3.2.3.1
      */
    var parseSei = function parseSei(bytes) {
      var i = 0,
          result = {
        payloadType: -1,
        payloadSize: 0
      },
          payloadType = 0,
          payloadSize = 0;

      // go through the sei_rbsp parsing each each individual sei_message
      while (i < bytes.byteLength) {
        // stop once we have hit the end of the sei_rbsp
        if (bytes[i] === RBSP_TRAILING_BITS) {
          break;
        }

        // Parse payload type
        while (bytes[i] === 0xFF) {
          payloadType += 255;
          i++;
        }
        payloadType += bytes[i++];

        // Parse payload size
        while (bytes[i] === 0xFF) {
          payloadSize += 255;
          i++;
        }
        payloadSize += bytes[i++];

        // this sei_message is a 608/708 caption so save it and break
        // there can only ever be one caption message in a frame's sei
        if (!result.payload && payloadType === USER_DATA_REGISTERED_ITU_T_T35) {
          result.payloadType = payloadType;
          result.payloadSize = payloadSize;
          result.payload = bytes.subarray(i, i + payloadSize);
          break;
        }

        // skip the payload and parse the next message
        i += payloadSize;
        payloadType = 0;
        payloadSize = 0;
      }

      return result;
    };

    // see ANSI/SCTE 128-1 (2013), section 8.1
    var parseUserData = function parseUserData(sei) {
      // itu_t_t35_contry_code must be 181 (United States) for
      // captions
      if (sei.payload[0] !== 181) {
        return null;
      }

      // itu_t_t35_provider_code should be 49 (ATSC) for captions
      if ((sei.payload[1] << 8 | sei.payload[2]) !== 49) {
        return null;
      }

      // the user_identifier should be "GA94" to indicate ATSC1 data
      if (String.fromCharCode(sei.payload[3], sei.payload[4], sei.payload[5], sei.payload[6]) !== 'GA94') {
        return null;
      }

      // finally, user_data_type_code should be 0x03 for caption data
      if (sei.payload[7] !== 0x03) {
        return null;
      }

      // return the user_data_type_structure and strip the trailing
      // marker bits
      return sei.payload.subarray(8, sei.payload.length - 1);
    };

    // see CEA-708-D, section 4.4
    var parseCaptionPackets = function parseCaptionPackets(pts, userData) {
      var results = [],
          i,
          count,
          offset,
          data;

      // if this is just filler, return immediately
      if (!(userData[0] & 0x40)) {
        return results;
      }

      // parse out the cc_data_1 and cc_data_2 fields
      count = userData[0] & 0x1f;
      for (i = 0; i < count; i++) {
        offset = i * 3;
        data = {
          type: userData[offset + 2] & 0x03,
          pts: pts
        };

        // capture cc data when cc_valid is 1
        if (userData[offset + 2] & 0x04) {
          data.ccData = userData[offset + 3] << 8 | userData[offset + 4];
          results.push(data);
        }
      }
      return results;
    };

    var discardEmulationPreventionBytes = function discardEmulationPreventionBytes(data) {
      var length = data.byteLength,
          emulationPreventionBytesPositions = [],
          i = 1,
          newLength,
          newData;

      // Find all `Emulation Prevention Bytes`
      while (i < length - 2) {
        if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {
          emulationPreventionBytesPositions.push(i + 2);
          i += 2;
        } else {
          i++;
        }
      }

      // If no Emulation Prevention Bytes were found just return the original
      // array
      if (emulationPreventionBytesPositions.length === 0) {
        return data;
      }

      // Create a new array to hold the NAL unit data
      newLength = length - emulationPreventionBytesPositions.length;
      newData = new Uint8Array(newLength);
      var sourceIndex = 0;

      for (i = 0; i < newLength; sourceIndex++, i++) {
        if (sourceIndex === emulationPreventionBytesPositions[0]) {
          // Skip this byte
          sourceIndex++;
          // Remove this position index
          emulationPreventionBytesPositions.shift();
        }
        newData[i] = data[sourceIndex];
      }

      return newData;
    };

    // exports
    var captionPacketParser = {
      parseSei: parseSei,
      parseUserData: parseUserData,
      parseCaptionPackets: parseCaptionPackets,
      discardEmulationPreventionBytes: discardEmulationPreventionBytes,
      USER_DATA_REGISTERED_ITU_T_T35: USER_DATA_REGISTERED_ITU_T_T35
    };

    // -----------------
    // Link To Transport
    // -----------------


    var CaptionStream = function CaptionStream() {

      CaptionStream.prototype.init.call(this);

      this.captionPackets_ = [];

      this.ccStreams_ = [new Cea608Stream(0, 0), // eslint-disable-line no-use-before-define
      new Cea608Stream(0, 1), // eslint-disable-line no-use-before-define
      new Cea608Stream(1, 0), // eslint-disable-line no-use-before-define
      new Cea608Stream(1, 1) // eslint-disable-line no-use-before-define
      ];

      this.reset();

      // forward data and done events from CCs to this CaptionStream
      this.ccStreams_.forEach(function (cc) {
        cc.on('data', this.trigger.bind(this, 'data'));
        cc.on('partialdone', this.trigger.bind(this, 'partialdone'));
        cc.on('done', this.trigger.bind(this, 'done'));
      }, this);
    };

    CaptionStream.prototype = new stream();
    CaptionStream.prototype.push = function (event) {
      var sei, userData, newCaptionPackets;

      // only examine SEI NALs
      if (event.nalUnitType !== 'sei_rbsp') {
        return;
      }

      // parse the sei
      sei = captionPacketParser.parseSei(event.escapedRBSP);

      // ignore everything but user_data_registered_itu_t_t35
      if (sei.payloadType !== captionPacketParser.USER_DATA_REGISTERED_ITU_T_T35) {
        return;
      }

      // parse out the user data payload
      userData = captionPacketParser.parseUserData(sei);

      // ignore unrecognized userData
      if (!userData) {
        return;
      }

      // Sometimes, the same segment # will be downloaded twice. To stop the
      // caption data from being processed twice, we track the latest dts we've
      // received and ignore everything with a dts before that. However, since
      // data for a specific dts can be split across packets on either side of
      // a segment boundary, we need to make sure we *don't* ignore the packets
      // from the *next* segment that have dts === this.latestDts_. By constantly
      // tracking the number of packets received with dts === this.latestDts_, we
      // know how many should be ignored once we start receiving duplicates.
      if (event.dts < this.latestDts_) {
        // We've started getting older data, so set the flag.
        this.ignoreNextEqualDts_ = true;
        return;
      } else if (event.dts === this.latestDts_ && this.ignoreNextEqualDts_) {
        this.numSameDts_--;
        if (!this.numSameDts_) {
          // We've received the last duplicate packet, time to start processing again
          this.ignoreNextEqualDts_ = false;
        }
        return;
      }

      // parse out CC data packets and save them for later
      newCaptionPackets = captionPacketParser.parseCaptionPackets(event.pts, userData);
      this.captionPackets_ = this.captionPackets_.concat(newCaptionPackets);
      if (this.latestDts_ !== event.dts) {
        this.numSameDts_ = 0;
      }
      this.numSameDts_++;
      this.latestDts_ = event.dts;
    };

    CaptionStream.prototype.flushCCStreams = function (flushType) {
      this.ccStreams_.forEach(function (cc) {
        return flushType === 'flush' ? cc.flush() : cc.partialFlush();
      }, this);
    };

    CaptionStream.prototype.flushStream = function (flushType) {
      // make sure we actually parsed captions before proceeding
      if (!this.captionPackets_.length) {
        this.flushCCStreams(flushType);
        return;
      }

      // In Chrome, the Array#sort function is not stable so add a
      // presortIndex that we can use to ensure we get a stable-sort
      this.captionPackets_.forEach(function (elem, idx) {
        elem.presortIndex = idx;
      });

      // sort caption byte-pairs based on their PTS values
      this.captionPackets_.sort(function (a, b) {
        if (a.pts === b.pts) {
          return a.presortIndex - b.presortIndex;
        }
        return a.pts - b.pts;
      });

      this.captionPackets_.forEach(function (packet) {
        if (packet.type < 2) {
          // Dispatch packet to the right Cea608Stream
          this.dispatchCea608Packet(packet);
        }
        // this is where an 'else' would go for a dispatching packets
        // to a theoretical Cea708Stream that handles SERVICEn data
      }, this);

      this.captionPackets_.length = 0;
      this.flushCCStreams(flushType);
    };

    CaptionStream.prototype.flush = function () {
      return this.flushStream('flush');
    };

    // Only called if handling partial data
    CaptionStream.prototype.partialFlush = function () {
      return this.flushStream('partialFlush');
    };

    CaptionStream.prototype.reset = function () {
      this.latestDts_ = null;
      this.ignoreNextEqualDts_ = false;
      this.numSameDts_ = 0;
      this.activeCea608Channel_ = [null, null];
      this.ccStreams_.forEach(function (ccStream) {
        ccStream.reset();
      });
    };

    // From the CEA-608 spec:
    /*
     * When XDS sub-packets are interleaved with other services, the end of each sub-packet shall be followed
     * by a control pair to change to a different service. When any of the control codes from 0x10 to 0x1F is
     * used to begin a control code pair, it indicates the return to captioning or Text data. The control code pair
     * and subsequent data should then be processed according to the FCC rules. It may be necessary for the
     * line 21 data encoder to automatically insert a control code pair (i.e. RCL, RU2, RU3, RU4, RDC, or RTD)
     * to switch to captioning or Text.
    */
    // With that in mind, we ignore any data between an XDS control code and a
    // subsequent closed-captioning control code.
    CaptionStream.prototype.dispatchCea608Packet = function (packet) {
      // NOTE: packet.type is the CEA608 field
      if (this.setsTextOrXDSActive(packet)) {
        this.activeCea608Channel_[packet.type] = null;
      } else if (this.setsChannel1Active(packet)) {
        this.activeCea608Channel_[packet.type] = 0;
      } else if (this.setsChannel2Active(packet)) {
        this.activeCea608Channel_[packet.type] = 1;
      }
      if (this.activeCea608Channel_[packet.type] === null) {
        // If we haven't received anything to set the active channel, or the
        // packets are Text/XDS data, discard the data; we don't want jumbled
        // captions
        return;
      }
      this.ccStreams_[(packet.type << 1) + this.activeCea608Channel_[packet.type]].push(packet);
    };

    CaptionStream.prototype.setsChannel1Active = function (packet) {
      return (packet.ccData & 0x7800) === 0x1000;
    };
    CaptionStream.prototype.setsChannel2Active = function (packet) {
      return (packet.ccData & 0x7800) === 0x1800;
    };
    CaptionStream.prototype.setsTextOrXDSActive = function (packet) {
      return (packet.ccData & 0x7100) === 0x0100 || (packet.ccData & 0x78fe) === 0x102a || (packet.ccData & 0x78fe) === 0x182a;
    };

    // ----------------------
    // Session to Application
    // ----------------------

    // This hash maps non-ASCII, special, and extended character codes to their
    // proper Unicode equivalent. The first keys that are only a single byte
    // are the non-standard ASCII characters, which simply map the CEA608 byte
    // to the standard ASCII/Unicode. The two-byte keys that follow are the CEA608
    // character codes, but have their MSB bitmasked with 0x03 so that a lookup
    // can be performed regardless of the field and data channel on which the
    // character code was received.
    var CHARACTER_TRANSLATION = {
      0x2a: 0xe1, // á
      0x5c: 0xe9, // é
      0x5e: 0xed, // í
      0x5f: 0xf3, // ó
      0x60: 0xfa, // ú
      0x7b: 0xe7, // ç
      0x7c: 0xf7, // ÷
      0x7d: 0xd1, // Ñ
      0x7e: 0xf1, // ñ
      0x7f: 0x2588, // █
      0x0130: 0xae, // ®
      0x0131: 0xb0, // °
      0x0132: 0xbd, // ½
      0x0133: 0xbf, // ¿
      0x0134: 0x2122, // ™
      0x0135: 0xa2, // ¢
      0x0136: 0xa3, // £
      0x0137: 0x266a, // ♪
      0x0138: 0xe0, // à
      0x0139: 0xa0, //
      0x013a: 0xe8, // è
      0x013b: 0xe2, // â
      0x013c: 0xea, // ê
      0x013d: 0xee, // î
      0x013e: 0xf4, // ô
      0x013f: 0xfb, // û
      0x0220: 0xc1, // Á
      0x0221: 0xc9, // É
      0x0222: 0xd3, // Ó
      0x0223: 0xda, // Ú
      0x0224: 0xdc, // Ü
      0x0225: 0xfc, // ü
      0x0226: 0x2018, // ‘
      0x0227: 0xa1, // ¡
      0x0228: 0x2a, // *
      0x0229: 0x27, // '
      0x022a: 0x2014, // —
      0x022b: 0xa9, // ©
      0x022c: 0x2120, // ℠
      0x022d: 0x2022, // •
      0x022e: 0x201c, // “
      0x022f: 0x201d, // ”
      0x0230: 0xc0, // À
      0x0231: 0xc2, // Â
      0x0232: 0xc7, // Ç
      0x0233: 0xc8, // È
      0x0234: 0xca, // Ê
      0x0235: 0xcb, // Ë
      0x0236: 0xeb, // ë
      0x0237: 0xce, // Î
      0x0238: 0xcf, // Ï
      0x0239: 0xef, // ï
      0x023a: 0xd4, // Ô
      0x023b: 0xd9, // Ù
      0x023c: 0xf9, // ù
      0x023d: 0xdb, // Û
      0x023e: 0xab, // «
      0x023f: 0xbb, // »
      0x0320: 0xc3, // Ã
      0x0321: 0xe3, // ã
      0x0322: 0xcd, // Í
      0x0323: 0xcc, // Ì
      0x0324: 0xec, // ì
      0x0325: 0xd2, // Ò
      0x0326: 0xf2, // ò
      0x0327: 0xd5, // Õ
      0x0328: 0xf5, // õ
      0x0329: 0x7b, // {
      0x032a: 0x7d, // }
      0x032b: 0x5c, // \
      0x032c: 0x5e, // ^
      0x032d: 0x5f, // _
      0x032e: 0x7c, // |
      0x032f: 0x7e, // ~
      0x0330: 0xc4, // Ä
      0x0331: 0xe4, // ä
      0x0332: 0xd6, // Ö
      0x0333: 0xf6, // ö
      0x0334: 0xdf, // ß
      0x0335: 0xa5, // ¥
      0x0336: 0xa4, // ¤
      0x0337: 0x2502, // │
      0x0338: 0xc5, // Å
      0x0339: 0xe5, // å
      0x033a: 0xd8, // Ø
      0x033b: 0xf8, // ø
      0x033c: 0x250c, // ┌
      0x033d: 0x2510, // ┐
      0x033e: 0x2514, // └
      0x033f: 0x2518 // ┘
    };

    var getCharFromCode = function getCharFromCode(code) {
      if (code === null) {
        return '';
      }
      code = CHARACTER_TRANSLATION[code] || code;
      return String.fromCharCode(code);
    };

    // the index of the last row in a CEA-608 display buffer
    var BOTTOM_ROW = 14;

    // This array is used for mapping PACs -> row #, since there's no way of
    // getting it through bit logic.
    var ROWS = [0x1100, 0x1120, 0x1200, 0x1220, 0x1500, 0x1520, 0x1600, 0x1620, 0x1700, 0x1720, 0x1000, 0x1300, 0x1320, 0x1400, 0x1420];

    // CEA-608 captions are rendered onto a 34x15 matrix of character
    // cells. The "bottom" row is the last element in the outer array.
    var createDisplayBuffer = function createDisplayBuffer() {
      var result = [],
          i = BOTTOM_ROW + 1;
      while (i--) {
        result.push('');
      }
      return result;
    };

    var Cea608Stream = function Cea608Stream(field, dataChannel) {
      Cea608Stream.prototype.init.call(this);

      this.field_ = field || 0;
      this.dataChannel_ = dataChannel || 0;

      this.name_ = 'CC' + ((this.field_ << 1 | this.dataChannel_) + 1);

      this.setConstants();
      this.reset();

      this.push = function (packet) {
        var data, swap, char0, char1, text;
        // remove the parity bits
        data = packet.ccData & 0x7f7f;

        // ignore duplicate control codes; the spec demands they're sent twice
        if (data === this.lastControlCode_) {
          this.lastControlCode_ = null;
          return;
        }

        // Store control codes
        if ((data & 0xf000) === 0x1000) {
          this.lastControlCode_ = data;
        } else if (data !== this.PADDING_) {
          this.lastControlCode_ = null;
        }

        char0 = data >>> 8;
        char1 = data & 0xff;

        if (data === this.PADDING_) {
          return;
        } else if (data === this.RESUME_CAPTION_LOADING_) {
          this.mode_ = 'popOn';
        } else if (data === this.END_OF_CAPTION_) {
          // If an EOC is received while in paint-on mode, the displayed caption
          // text should be swapped to non-displayed memory as if it was a pop-on
          // caption. Because of that, we should explicitly switch back to pop-on
          // mode
          this.mode_ = 'popOn';
          this.clearFormatting(packet.pts);
          // if a caption was being displayed, it's gone now
          this.flushDisplayed(packet.pts);

          // flip memory
          swap = this.displayed_;
          this.displayed_ = this.nonDisplayed_;
          this.nonDisplayed_ = swap;

          // start measuring the time to display the caption
          this.startPts_ = packet.pts;
        } else if (data === this.ROLL_UP_2_ROWS_) {
          this.rollUpRows_ = 2;
          this.setRollUp(packet.pts);
        } else if (data === this.ROLL_UP_3_ROWS_) {
          this.rollUpRows_ = 3;
          this.setRollUp(packet.pts);
        } else if (data === this.ROLL_UP_4_ROWS_) {
          this.rollUpRows_ = 4;
          this.setRollUp(packet.pts);
        } else if (data === this.CARRIAGE_RETURN_) {
          this.clearFormatting(packet.pts);
          this.flushDisplayed(packet.pts);
          this.shiftRowsUp_();
          this.startPts_ = packet.pts;
        } else if (data === this.BACKSPACE_) {
          if (this.mode_ === 'popOn') {
            this.nonDisplayed_[this.row_] = this.nonDisplayed_[this.row_].slice(0, -1);
          } else {
            this.displayed_[this.row_] = this.displayed_[this.row_].slice(0, -1);
          }
        } else if (data === this.ERASE_DISPLAYED_MEMORY_) {
          this.flushDisplayed(packet.pts);
          this.displayed_ = createDisplayBuffer();
        } else if (data === this.ERASE_NON_DISPLAYED_MEMORY_) {
          this.nonDisplayed_ = createDisplayBuffer();
        } else if (data === this.RESUME_DIRECT_CAPTIONING_) {
          if (this.mode_ !== 'paintOn') {
            // NOTE: This should be removed when proper caption positioning is
            // implemented
            this.flushDisplayed(packet.pts);
            this.displayed_ = createDisplayBuffer();
          }
          this.mode_ = 'paintOn';
          this.startPts_ = packet.pts;

          // Append special characters to caption text
        } else if (this.isSpecialCharacter(char0, char1)) {
          // Bitmask char0 so that we can apply character transformations
          // regardless of field and data channel.
          // Then byte-shift to the left and OR with char1 so we can pass the
          // entire character code to `getCharFromCode`.
          char0 = (char0 & 0x03) << 8;
          text = getCharFromCode(char0 | char1);
          this[this.mode_](packet.pts, text);
          this.column_++;

          // Append extended characters to caption text
        } else if (this.isExtCharacter(char0, char1)) {
          // Extended characters always follow their "non-extended" equivalents.
          // IE if a "è" is desired, you'll always receive "eè"; non-compliant
          // decoders are supposed to drop the "è", while compliant decoders
          // backspace the "e" and insert "è".

          // Delete the previous character
          if (this.mode_ === 'popOn') {
            this.nonDisplayed_[this.row_] = this.nonDisplayed_[this.row_].slice(0, -1);
          } else {
            this.displayed_[this.row_] = this.displayed_[this.row_].slice(0, -1);
          }

          // Bitmask char0 so that we can apply character transformations
          // regardless of field and data channel.
          // Then byte-shift to the left and OR with char1 so we can pass the
          // entire character code to `getCharFromCode`.
          char0 = (char0 & 0x03) << 8;
          text = getCharFromCode(char0 | char1);
          this[this.mode_](packet.pts, text);
          this.column_++;

          // Process mid-row codes
        } else if (this.isMidRowCode(char0, char1)) {
          // Attributes are not additive, so clear all formatting
          this.clearFormatting(packet.pts);

          // According to the standard, mid-row codes
          // should be replaced with spaces, so add one now
          this[this.mode_](packet.pts, ' ');
          this.column_++;

          if ((char1 & 0xe) === 0xe) {
            this.addFormatting(packet.pts, ['i']);
          }

          if ((char1 & 0x1) === 0x1) {
            this.addFormatting(packet.pts, ['u']);
          }

          // Detect offset control codes and adjust cursor
        } else if (this.isOffsetControlCode(char0, char1)) {
          // Cursor position is set by indent PAC (see below) in 4-column
          // increments, with an additional offset code of 1-3 to reach any
          // of the 32 columns specified by CEA-608. So all we need to do
          // here is increment the column cursor by the given offset.
          this.column_ += char1 & 0x03;

          // Detect PACs (Preamble Address Codes)
        } else if (this.isPAC(char0, char1)) {

          // There's no logic for PAC -> row mapping, so we have to just
          // find the row code in an array and use its index :(
          var row = ROWS.indexOf(data & 0x1f20);

          // Configure the caption window if we're in roll-up mode
          if (this.mode_ === 'rollUp') {
            // This implies that the base row is incorrectly set.
            // As per the recommendation in CEA-608(Base Row Implementation), defer to the number
            // of roll-up rows set.
            if (row - this.rollUpRows_ + 1 < 0) {
              row = this.rollUpRows_ - 1;
            }

            this.setRollUp(packet.pts, row);
          }

          if (row !== this.row_) {
            // formatting is only persistent for current row
            this.clearFormatting(packet.pts);
            this.row_ = row;
          }
          // All PACs can apply underline, so detect and apply
          // (All odd-numbered second bytes set underline)
          if (char1 & 0x1 && this.formatting_.indexOf('u') === -1) {
            this.addFormatting(packet.pts, ['u']);
          }

          if ((data & 0x10) === 0x10) {
            // We've got an indent level code. Each successive even number
            // increments the column cursor by 4, so we can get the desired
            // column position by bit-shifting to the right (to get n/2)
            // and multiplying by 4.
            this.column_ = ((data & 0xe) >> 1) * 4;
          }

          if (this.isColorPAC(char1)) {
            // it's a color code, though we only support white, which
            // can be either normal or italicized. white italics can be
            // either 0x4e or 0x6e depending on the row, so we just
            // bitwise-and with 0xe to see if italics should be turned on
            if ((char1 & 0xe) === 0xe) {
              this.addFormatting(packet.pts, ['i']);
            }
          }

          // We have a normal character in char0, and possibly one in char1
        } else if (this.isNormalChar(char0)) {
          if (char1 === 0x00) {
            char1 = null;
          }
          text = getCharFromCode(char0);
          text += getCharFromCode(char1);
          this[this.mode_](packet.pts, text);
          this.column_ += text.length;
        } // finish data processing
      };
    };
    Cea608Stream.prototype = new stream();
    // Trigger a cue point that captures the current state of the
    // display buffer
    Cea608Stream.prototype.flushDisplayed = function (pts) {
      var content = this.displayed_
      // remove spaces from the start and end of the string
      .map(function (row) {
        try {
          return row.trim();
        } catch (e) {
          // Ordinarily, this shouldn't happen. However, caption
          // parsing errors should not throw exceptions and
          // break playback.
          // eslint-disable-next-line no-console
          console.error('Skipping malformed caption.');
          return '';
        }
      })
      // combine all text rows to display in one cue
      .join('\n')
      // and remove blank rows from the start and end, but not the middle
      .replace(/^\n+|\n+$/g, '');

      if (content.length) {
        this.trigger('data', {
          startPts: this.startPts_,
          endPts: pts,
          text: content,
          stream: this.name_
        });
      }
    };

    /**
     * Zero out the data, used for startup and on seek
     */
    Cea608Stream.prototype.reset = function () {
      this.mode_ = 'popOn';
      // When in roll-up mode, the index of the last row that will
      // actually display captions. If a caption is shifted to a row
      // with a lower index than this, it is cleared from the display
      // buffer
      this.topRow_ = 0;
      this.startPts_ = 0;
      this.displayed_ = createDisplayBuffer();
      this.nonDisplayed_ = createDisplayBuffer();
      this.lastControlCode_ = null;

      // Track row and column for proper line-breaking and spacing
      this.column_ = 0;
      this.row_ = BOTTOM_ROW;
      this.rollUpRows_ = 2;

      // This variable holds currently-applied formatting
      this.formatting_ = [];
    };

    /**
     * Sets up control code and related constants for this instance
     */
    Cea608Stream.prototype.setConstants = function () {
      // The following attributes have these uses:
      // ext_ :    char0 for mid-row codes, and the base for extended
      //           chars (ext_+0, ext_+1, and ext_+2 are char0s for
      //           extended codes)
      // control_: char0 for control codes, except byte-shifted to the
      //           left so that we can do this.control_ | CONTROL_CODE
      // offset_:  char0 for tab offset codes
      //
      // It's also worth noting that control codes, and _only_ control codes,
      // differ between field 1 and field2. Field 2 control codes are always
      // their field 1 value plus 1. That's why there's the "| field" on the
      // control value.
      if (this.dataChannel_ === 0) {
        this.BASE_ = 0x10;
        this.EXT_ = 0x11;
        this.CONTROL_ = (0x14 | this.field_) << 8;
        this.OFFSET_ = 0x17;
      } else if (this.dataChannel_ === 1) {
        this.BASE_ = 0x18;
        this.EXT_ = 0x19;
        this.CONTROL_ = (0x1c | this.field_) << 8;
        this.OFFSET_ = 0x1f;
      }

      // Constants for the LSByte command codes recognized by Cea608Stream. This
      // list is not exhaustive. For a more comprehensive listing and semantics see
      // http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol1/pdf/CFR-2010-title47-vol1-sec15-119.pdf
      // Padding
      this.PADDING_ = 0x0000;
      // Pop-on Mode
      this.RESUME_CAPTION_LOADING_ = this.CONTROL_ | 0x20;
      this.END_OF_CAPTION_ = this.CONTROL_ | 0x2f;
      // Roll-up Mode
      this.ROLL_UP_2_ROWS_ = this.CONTROL_ | 0x25;
      this.ROLL_UP_3_ROWS_ = this.CONTROL_ | 0x26;
      this.ROLL_UP_4_ROWS_ = this.CONTROL_ | 0x27;
      this.CARRIAGE_RETURN_ = this.CONTROL_ | 0x2d;
      // paint-on mode
      this.RESUME_DIRECT_CAPTIONING_ = this.CONTROL_ | 0x29;
      // Erasure
      this.BACKSPACE_ = this.CONTROL_ | 0x21;
      this.ERASE_DISPLAYED_MEMORY_ = this.CONTROL_ | 0x2c;
      this.ERASE_NON_DISPLAYED_MEMORY_ = this.CONTROL_ | 0x2e;
    };

    /**
     * Detects if the 2-byte packet data is a special character
     *
     * Special characters have a second byte in the range 0x30 to 0x3f,
     * with the first byte being 0x11 (for data channel 1) or 0x19 (for
     * data channel 2).
     *
     * @param  {Integer} char0 The first byte
     * @param  {Integer} char1 The second byte
     * @return {Boolean}       Whether the 2 bytes are an special character
     */
    Cea608Stream.prototype.isSpecialCharacter = function (char0, char1) {
      return char0 === this.EXT_ && char1 >= 0x30 && char1 <= 0x3f;
    };

    /**
     * Detects if the 2-byte packet data is an extended character
     *
     * Extended characters have a second byte in the range 0x20 to 0x3f,
     * with the first byte being 0x12 or 0x13 (for data channel 1) or
     * 0x1a or 0x1b (for data channel 2).
     *
     * @param  {Integer} char0 The first byte
     * @param  {Integer} char1 The second byte
     * @return {Boolean}       Whether the 2 bytes are an extended character
     */
    Cea608Stream.prototype.isExtCharacter = function (char0, char1) {
      return (char0 === this.EXT_ + 1 || char0 === this.EXT_ + 2) && char1 >= 0x20 && char1 <= 0x3f;
    };

    /**
     * Detects if the 2-byte packet is a mid-row code
     *
     * Mid-row codes have a second byte in the range 0x20 to 0x2f, with
     * the first byte being 0x11 (for data channel 1) or 0x19 (for data
     * channel 2).
     *
     * @param  {Integer} char0 The first byte
     * @param  {Integer} char1 The second byte
     * @return {Boolean}       Whether the 2 bytes are a mid-row code
     */
    Cea608Stream.prototype.isMidRowCode = function (char0, char1) {
      return char0 === this.EXT_ && char1 >= 0x20 && char1 <= 0x2f;
    };

    /**
     * Detects if the 2-byte packet is an offset control code
     *
     * Offset control codes have a second byte in the range 0x21 to 0x23,
     * with the first byte being 0x17 (for data channel 1) or 0x1f (for
     * data channel 2).
     *
     * @param  {Integer} char0 The first byte
     * @param  {Integer} char1 The second byte
     * @return {Boolean}       Whether the 2 bytes are an offset control code
     */
    Cea608Stream.prototype.isOffsetControlCode = function (char0, char1) {
      return char0 === this.OFFSET_ && char1 >= 0x21 && char1 <= 0x23;
    };

    /**
     * Detects if the 2-byte packet is a Preamble Address Code
     *
     * PACs have a first byte in the range 0x10 to 0x17 (for data channel 1)
     * or 0x18 to 0x1f (for data channel 2), with the second byte in the
     * range 0x40 to 0x7f.
     *
     * @param  {Integer} char0 The first byte
     * @param  {Integer} char1 The second byte
     * @return {Boolean}       Whether the 2 bytes are a PAC
     */
    Cea608Stream.prototype.isPAC = function (char0, char1) {
      return char0 >= this.BASE_ && char0 < this.BASE_ + 8 && char1 >= 0x40 && char1 <= 0x7f;
    };

    /**
     * Detects if a packet's second byte is in the range of a PAC color code
     *
     * PAC color codes have the second byte be in the range 0x40 to 0x4f, or
     * 0x60 to 0x6f.
     *
     * @param  {Integer} char1 The second byte
     * @return {Boolean}       Whether the byte is a color PAC
     */
    Cea608Stream.prototype.isColorPAC = function (char1) {
      return char1 >= 0x40 && char1 <= 0x4f || char1 >= 0x60 && char1 <= 0x7f;
    };

    /**
     * Detects if a single byte is in the range of a normal character
     *
     * Normal text bytes are in the range 0x20 to 0x7f.
     *
     * @param  {Integer} char  The byte
     * @return {Boolean}       Whether the byte is a normal character
     */
    Cea608Stream.prototype.isNormalChar = function (char) {
      return char >= 0x20 && char <= 0x7f;
    };

    /**
     * Configures roll-up
     *
     * @param  {Integer} pts         Current PTS
     * @param  {Integer} newBaseRow  Used by PACs to slide the current window to
     *                               a new position
     */
    Cea608Stream.prototype.setRollUp = function (pts, newBaseRow) {
      // Reset the base row to the bottom row when switching modes
      if (this.mode_ !== 'rollUp') {
        this.row_ = BOTTOM_ROW;
        this.mode_ = 'rollUp';
        // Spec says to wipe memories when switching to roll-up
        this.flushDisplayed(pts);
        this.nonDisplayed_ = createDisplayBuffer();
        this.displayed_ = createDisplayBuffer();
      }

      if (newBaseRow !== undefined && newBaseRow !== this.row_) {
        // move currently displayed captions (up or down) to the new base row
        for (var i = 0; i < this.rollUpRows_; i++) {
          this.displayed_[newBaseRow - i] = this.displayed_[this.row_ - i];
          this.displayed_[this.row_ - i] = '';
        }
      }

      if (newBaseRow === undefined) {
        newBaseRow = this.row_;
      }

      this.topRow_ = newBaseRow - this.rollUpRows_ + 1;
    };

    // Adds the opening HTML tag for the passed character to the caption text,
    // and keeps track of it for later closing
    Cea608Stream.prototype.addFormatting = function (pts, format) {
      this.formatting_ = this.formatting_.concat(format);
      var text = format.reduce(function (text, format) {
        return text + '<' + format + '>';
      }, '');
      this[this.mode_](pts, text);
    };

    // Adds HTML closing tags for current formatting to caption text and
    // clears remembered formatting
    Cea608Stream.prototype.clearFormatting = function (pts) {
      if (!this.formatting_.length) {
        return;
      }
      var text = this.formatting_.reverse().reduce(function (text, format) {
        return text + '</' + format + '>';
      }, '');
      this.formatting_ = [];
      this[this.mode_](pts, text);
    };

    // Mode Implementations
    Cea608Stream.prototype.popOn = function (pts, text) {
      var baseRow = this.nonDisplayed_[this.row_];

      // buffer characters
      baseRow += text;
      this.nonDisplayed_[this.row_] = baseRow;
    };

    Cea608Stream.prototype.rollUp = function (pts, text) {
      var baseRow = this.displayed_[this.row_];

      baseRow += text;
      this.displayed_[this.row_] = baseRow;
    };

    Cea608Stream.prototype.shiftRowsUp_ = function () {
      var i;
      // clear out inactive rows
      for (i = 0; i < this.topRow_; i++) {
        this.displayed_[i] = '';
      }
      for (i = this.row_ + 1; i < BOTTOM_ROW + 1; i++) {
        this.displayed_[i] = '';
      }
      // shift displayed rows up
      for (i = this.topRow_; i < this.row_; i++) {
        this.displayed_[i] = this.displayed_[i + 1];
      }
      // clear out the bottom row
      this.displayed_[this.row_] = '';
    };

    Cea608Stream.prototype.paintOn = function (pts, text) {
      var baseRow = this.displayed_[this.row_];

      baseRow += text;
      this.displayed_[this.row_] = baseRow;
    };

    // exports
    var captionStream = {
      CaptionStream: CaptionStream,
      Cea608Stream: Cea608Stream
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */

    var streamTypes = {
      H264_STREAM_TYPE: 0x1B,
      ADTS_STREAM_TYPE: 0x0F,
      METADATA_STREAM_TYPE: 0x15
    };

    var MAX_TS = 8589934592;

    var RO_THRESH = 4294967296;

    var TYPE_SHARED = 'shared';

    var handleRollover = function handleRollover(value, reference) {
      var direction = 1;

      if (value > reference) {
        // If the current timestamp value is greater than our reference timestamp and we detect a
        // timestamp rollover, this means the roll over is happening in the opposite direction.
        // Example scenario: Enter a long stream/video just after a rollover occurred. The reference
        // point will be set to a small number, e.g. 1. The user then seeks backwards over the
        // rollover point. In loading this segment, the timestamp values will be very large,
        // e.g. 2^33 - 1. Since this comes before the data we loaded previously, we want to adjust
        // the time stamp to be `value - 2^33`.
        direction = -1;
      }

      // Note: A seek forwards or back that is greater than the RO_THRESH (2^32, ~13 hours) will
      // cause an incorrect adjustment.
      while (Math.abs(reference - value) > RO_THRESH) {
        value += direction * MAX_TS;
      }

      return value;
    };

    var TimestampRolloverStream = function TimestampRolloverStream(type) {
      var lastDTS, referenceDTS;

      TimestampRolloverStream.prototype.init.call(this);

      // The "shared" type is used in cases where a stream will contain muxed
      // video and audio. We could use `undefined` here, but having a string
      // makes debugging a little clearer.
      this.type_ = type || TYPE_SHARED;

      this.push = function (data) {

        // Any "shared" rollover streams will accept _all_ data. Otherwise,
        // streams will only accept data that matches their type.
        if (this.type_ !== TYPE_SHARED && data.type !== this.type_) {
          return;
        }

        if (referenceDTS === undefined) {
          referenceDTS = data.dts;
        }

        data.dts = handleRollover(data.dts, referenceDTS);
        data.pts = handleRollover(data.pts, referenceDTS);

        lastDTS = data.dts;

        this.trigger('data', data);
      };

      this.flush = function () {
        referenceDTS = lastDTS;
        this.trigger('done');
      };

      this.endTimeline = function () {
        this.flush();
        this.trigger('endedtimeline');
      };

      this.discontinuity = function () {
        referenceDTS = void 0;
        lastDTS = void 0;
      };

      this.reset = function () {
        this.discontinuity();
        this.trigger('reset');
      };
    };

    TimestampRolloverStream.prototype = new stream();

    var timestampRolloverStream = {
      TimestampRolloverStream: TimestampRolloverStream,
      handleRollover: handleRollover
    };

    var percentEncode = function percentEncode(bytes, start, end) {
      var i,
          result = '';
      for (i = start; i < end; i++) {
        result += '%' + ('00' + bytes[i].toString(16)).slice(-2);
      }
      return result;
    },


    // return the string representation of the specified byte range,
    // interpreted as UTf-8.
    parseUtf8 = function parseUtf8(bytes, start, end) {
      return decodeURIComponent(percentEncode(bytes, start, end));
    },


    // return the string representation of the specified byte range,
    // interpreted as ISO-8859-1.
    parseIso88591 = function parseIso88591(bytes, start, end) {
      return unescape(percentEncode(bytes, start, end)); // jshint ignore:line
    },
        parseSyncSafeInteger = function parseSyncSafeInteger(data) {
      return data[0] << 21 | data[1] << 14 | data[2] << 7 | data[3];
    },
        tagParsers = {
      TXXX: function TXXX(tag) {
        var i;
        if (tag.data[0] !== 3) {
          // ignore frames with unrecognized character encodings
          return;
        }

        for (i = 1; i < tag.data.length; i++) {
          if (tag.data[i] === 0) {
            // parse the text fields
            tag.description = parseUtf8(tag.data, 1, i);
            // do not include the null terminator in the tag value
            tag.value = parseUtf8(tag.data, i + 1, tag.data.length).replace(/\0*$/, '');
            break;
          }
        }
        tag.data = tag.value;
      },
      WXXX: function WXXX(tag) {
        var i;
        if (tag.data[0] !== 3) {
          // ignore frames with unrecognized character encodings
          return;
        }

        for (i = 1; i < tag.data.length; i++) {
          if (tag.data[i] === 0) {
            // parse the description and URL fields
            tag.description = parseUtf8(tag.data, 1, i);
            tag.url = parseUtf8(tag.data, i + 1, tag.data.length);
            break;
          }
        }
      },
      PRIV: function PRIV(tag) {
        var i;

        for (i = 0; i < tag.data.length; i++) {
          if (tag.data[i] === 0) {
            // parse the description and URL fields
            tag.owner = parseIso88591(tag.data, 0, i);
            break;
          }
        }
        tag.privateData = tag.data.subarray(i + 1);
        tag.data = tag.privateData;
      }
    },
        _MetadataStream;

    _MetadataStream = function MetadataStream(options) {
      var settings = {
        debug: !!(options && options.debug),

        // the bytes of the program-level descriptor field in MP2T
        // see ISO/IEC 13818-1:2013 (E), section 2.6 "Program and
        // program element descriptors"
        descriptor: options && options.descriptor
      },


      // the total size in bytes of the ID3 tag being parsed
      tagSize = 0,


      // tag data that is not complete enough to be parsed
      buffer = [],


      // the total number of bytes currently in the buffer
      bufferSize = 0,
          i;

      _MetadataStream.prototype.init.call(this);

      // calculate the text track in-band metadata track dispatch type
      // https://html.spec.whatwg.org/multipage/embedded-content.html#steps-to-expose-a-media-resource-specific-text-track
      this.dispatchType = streamTypes.METADATA_STREAM_TYPE.toString(16);
      if (settings.descriptor) {
        for (i = 0; i < settings.descriptor.length; i++) {
          this.dispatchType += ('00' + settings.descriptor[i].toString(16)).slice(-2);
        }
      }

      this.push = function (chunk) {
        var tag, frameStart, frameSize, frame, i, frameHeader;
        if (chunk.type !== 'timed-metadata') {
          return;
        }

        // if data_alignment_indicator is set in the PES header,
        // we must have the start of a new ID3 tag. Assume anything
        // remaining in the buffer was malformed and throw it out
        if (chunk.dataAlignmentIndicator) {
          bufferSize = 0;
          buffer.length = 0;
        }

        // ignore events that don't look like ID3 data
        if (buffer.length === 0 && (chunk.data.length < 10 || chunk.data[0] !== 'I'.charCodeAt(0) || chunk.data[1] !== 'D'.charCodeAt(0) || chunk.data[2] !== '3'.charCodeAt(0))) {
          if (settings.debug) {
            // eslint-disable-next-line no-console
            console.log('Skipping unrecognized metadata packet');
          }
          return;
        }

        // add this chunk to the data we've collected so far

        buffer.push(chunk);
        bufferSize += chunk.data.byteLength;

        // grab the size of the entire frame from the ID3 header
        if (buffer.length === 1) {
          // the frame size is transmitted as a 28-bit integer in the
          // last four bytes of the ID3 header.
          // The most significant bit of each byte is dropped and the
          // results concatenated to recover the actual value.
          tagSize = parseSyncSafeInteger(chunk.data.subarray(6, 10));

          // ID3 reports the tag size excluding the header but it's more
          // convenient for our comparisons to include it
          tagSize += 10;
        }

        // if the entire frame has not arrived, wait for more data
        if (bufferSize < tagSize) {
          return;
        }

        // collect the entire frame so it can be parsed
        tag = {
          data: new Uint8Array(tagSize),
          frames: [],
          pts: buffer[0].pts,
          dts: buffer[0].dts
        };
        for (i = 0; i < tagSize;) {
          tag.data.set(buffer[0].data.subarray(0, tagSize - i), i);
          i += buffer[0].data.byteLength;
          bufferSize -= buffer[0].data.byteLength;
          buffer.shift();
        }

        // find the start of the first frame and the end of the tag
        frameStart = 10;
        if (tag.data[5] & 0x40) {
          // advance the frame start past the extended header
          frameStart += 4; // header size field
          frameStart += parseSyncSafeInteger(tag.data.subarray(10, 14));

          // clip any padding off the end
          tagSize -= parseSyncSafeInteger(tag.data.subarray(16, 20));
        }

        // parse one or more ID3 frames
        // http://id3.org/id3v2.3.0#ID3v2_frame_overview
        do {
          // determine the number of bytes in this frame
          frameSize = parseSyncSafeInteger(tag.data.subarray(frameStart + 4, frameStart + 8));
          if (frameSize < 1) {
            // eslint-disable-next-line no-console
            return console.log('Malformed ID3 frame encountered. Skipping metadata parsing.');
          }
          frameHeader = String.fromCharCode(tag.data[frameStart], tag.data[frameStart + 1], tag.data[frameStart + 2], tag.data[frameStart + 3]);

          frame = {
            id: frameHeader,
            data: tag.data.subarray(frameStart + 10, frameStart + frameSize + 10)
          };
          frame.key = frame.id;
          if (tagParsers[frame.id]) {
            tagParsers[frame.id](frame);

            // handle the special PRIV frame used to indicate the start
            // time for raw AAC data
            if (frame.owner === 'com.apple.streaming.transportStreamTimestamp') {
              var d = frame.data,
                  size = (d[3] & 0x01) << 30 | d[4] << 22 | d[5] << 14 | d[6] << 6 | d[7] >>> 2;

              size *= 4;
              size += d[7] & 0x03;
              frame.timeStamp = size;
              // in raw AAC, all subsequent data will be timestamped based
              // on the value of this frame
              // we couldn't have known the appropriate pts and dts before
              // parsing this ID3 tag so set those values now
              if (tag.pts === undefined && tag.dts === undefined) {
                tag.pts = frame.timeStamp;
                tag.dts = frame.timeStamp;
              }
              this.trigger('timestamp', frame);
            }
          }
          tag.frames.push(frame);

          frameStart += 10; // advance past the frame header
          frameStart += frameSize; // advance past the frame body
        } while (frameStart < tagSize);
        this.trigger('data', tag);
      };
    };
    _MetadataStream.prototype = new stream();

    var metadataStream = _MetadataStream;

    var TimestampRolloverStream$1 = timestampRolloverStream.TimestampRolloverStream;

    // object types
    var _TransportPacketStream, _TransportParseStream, _ElementaryStream;

    // constants
    var MP2T_PACKET_LENGTH = 188,

    // bytes
    SYNC_BYTE = 0x47;

    /**
     * Splits an incoming stream of binary data into MPEG-2 Transport
     * Stream packets.
     */
    _TransportPacketStream = function TransportPacketStream() {
      var buffer = new Uint8Array(MP2T_PACKET_LENGTH),
          bytesInBuffer = 0;

      _TransportPacketStream.prototype.init.call(this);

      // Deliver new bytes to the stream.

      /**
       * Split a stream of data into M2TS packets
      **/
      this.push = function (bytes) {
        var startIndex = 0,
            endIndex = MP2T_PACKET_LENGTH,
            everything;

        // If there are bytes remaining from the last segment, prepend them to the
        // bytes that were pushed in
        if (bytesInBuffer) {
          everything = new Uint8Array(bytes.byteLength + bytesInBuffer);
          everything.set(buffer.subarray(0, bytesInBuffer));
          everything.set(bytes, bytesInBuffer);
          bytesInBuffer = 0;
        } else {
          everything = bytes;
        }

        // While we have enough data for a packet
        while (endIndex < everything.byteLength) {
          // Look for a pair of start and end sync bytes in the data..
          if (everything[startIndex] === SYNC_BYTE && everything[endIndex] === SYNC_BYTE) {
            // We found a packet so emit it and jump one whole packet forward in
            // the stream
            this.trigger('data', everything.subarray(startIndex, endIndex));
            startIndex += MP2T_PACKET_LENGTH;
            endIndex += MP2T_PACKET_LENGTH;
            continue;
          }
          // If we get here, we have somehow become de-synchronized and we need to step
          // forward one byte at a time until we find a pair of sync bytes that denote
          // a packet
          startIndex++;
          endIndex++;
        }

        // If there was some data left over at the end of the segment that couldn't
        // possibly be a whole packet, keep it because it might be the start of a packet
        // that continues in the next segment
        if (startIndex < everything.byteLength) {
          buffer.set(everything.subarray(startIndex), 0);
          bytesInBuffer = everything.byteLength - startIndex;
        }
      };

      /**
       * Passes identified M2TS packets to the TransportParseStream to be parsed
      **/
      this.flush = function () {
        // If the buffer contains a whole packet when we are being flushed, emit it
        // and empty the buffer. Otherwise hold onto the data because it may be
        // important for decoding the next segment
        if (bytesInBuffer === MP2T_PACKET_LENGTH && buffer[0] === SYNC_BYTE) {
          this.trigger('data', buffer);
          bytesInBuffer = 0;
        }
        this.trigger('done');
      };

      this.endTimeline = function () {
        this.flush();
        this.trigger('endedtimeline');
      };

      this.reset = function () {
        bytesInBuffer = 0;
        this.trigger('reset');
      };
    };
    _TransportPacketStream.prototype = new stream();

    /**
     * Accepts an MP2T TransportPacketStream and emits data events with parsed
     * forms of the individual transport stream packets.
     */
    _TransportParseStream = function TransportParseStream() {
      var parsePsi, parsePat, parsePmt, self;
      _TransportParseStream.prototype.init.call(this);
      self = this;

      this.packetsWaitingForPmt = [];
      this.programMapTable = undefined;

      parsePsi = function parsePsi(payload, psi) {
        var offset = 0;

        // PSI packets may be split into multiple sections and those
        // sections may be split into multiple packets. If a PSI
        // section starts in this packet, the payload_unit_start_indicator
        // will be true and the first byte of the payload will indicate
        // the offset from the current position to the start of the
        // section.
        if (psi.payloadUnitStartIndicator) {
          offset += payload[offset] + 1;
        }

        if (psi.type === 'pat') {
          parsePat(payload.subarray(offset), psi);
        } else {
          parsePmt(payload.subarray(offset), psi);
        }
      };

      parsePat = function parsePat(payload, pat) {
        pat.section_number = payload[7]; // eslint-disable-line camelcase
        pat.last_section_number = payload[8]; // eslint-disable-line camelcase

        // skip the PSI header and parse the first PMT entry
        self.pmtPid = (payload[10] & 0x1F) << 8 | payload[11];
        pat.pmtPid = self.pmtPid;
      };

      /**
       * Parse out the relevant fields of a Program Map Table (PMT).
       * @param payload {Uint8Array} the PMT-specific portion of an MP2T
       * packet. The first byte in this array should be the table_id
       * field.
       * @param pmt {object} the object that should be decorated with
       * fields parsed from the PMT.
       */
      parsePmt = function parsePmt(payload, pmt) {
        var sectionLength, tableEnd, programInfoLength, offset;

        // PMTs can be sent ahead of the time when they should actually
        // take effect. We don't believe this should ever be the case
        // for HLS but we'll ignore "forward" PMT declarations if we see
        // them. Future PMT declarations have the current_next_indicator
        // set to zero.
        if (!(payload[5] & 0x01)) {
          return;
        }

        // overwrite any existing program map table
        self.programMapTable = {
          video: null,
          audio: null,
          'timed-metadata': {}
        };

        // the mapping table ends at the end of the current section
        sectionLength = (payload[1] & 0x0f) << 8 | payload[2];
        tableEnd = 3 + sectionLength - 4;

        // to determine where the table is, we have to figure out how
        // long the program info descriptors are
        programInfoLength = (payload[10] & 0x0f) << 8 | payload[11];

        // advance the offset to the first entry in the mapping table
        offset = 12 + programInfoLength;
        while (offset < tableEnd) {
          var streamType = payload[offset];
          var pid = (payload[offset + 1] & 0x1F) << 8 | payload[offset + 2];

          // only map a single elementary_pid for audio and video stream types
          // TODO: should this be done for metadata too? for now maintain behavior of
          //       multiple metadata streams
          if (streamType === streamTypes.H264_STREAM_TYPE && self.programMapTable.video === null) {
            self.programMapTable.video = pid;
          } else if (streamType === streamTypes.ADTS_STREAM_TYPE && self.programMapTable.audio === null) {
            self.programMapTable.audio = pid;
          } else if (streamType === streamTypes.METADATA_STREAM_TYPE) {
            // map pid to stream type for metadata streams
            self.programMapTable['timed-metadata'][pid] = streamType;
          }

          // move to the next table entry
          // skip past the elementary stream descriptors, if present
          offset += ((payload[offset + 3] & 0x0F) << 8 | payload[offset + 4]) + 5;
        }

        // record the map on the packet as well
        pmt.programMapTable = self.programMapTable;
      };

      /**
       * Deliver a new MP2T packet to the next stream in the pipeline.
       */
      this.push = function (packet) {
        var result = {},
            offset = 4;

        result.payloadUnitStartIndicator = !!(packet[1] & 0x40);

        // pid is a 13-bit field starting at the last bit of packet[1]
        result.pid = packet[1] & 0x1f;
        result.pid <<= 8;
        result.pid |= packet[2];

        // if an adaption field is present, its length is specified by the
        // fifth byte of the TS packet header. The adaptation field is
        // used to add stuffing to PES packets that don't fill a complete
        // TS packet, and to specify some forms of timing and control data
        // that we do not currently use.
        if ((packet[3] & 0x30) >>> 4 > 0x01) {
          offset += packet[offset] + 1;
        }

        // parse the rest of the packet based on the type
        if (result.pid === 0) {
          result.type = 'pat';
          parsePsi(packet.subarray(offset), result);
          this.trigger('data', result);
        } else if (result.pid === this.pmtPid) {
          result.type = 'pmt';
          parsePsi(packet.subarray(offset), result);
          this.trigger('data', result);

          // if there are any packets waiting for a PMT to be found, process them now
          while (this.packetsWaitingForPmt.length) {
            this.processPes_.apply(this, this.packetsWaitingForPmt.shift());
          }
        } else if (this.programMapTable === undefined) {
          // When we have not seen a PMT yet, defer further processing of
          // PES packets until one has been parsed
          this.packetsWaitingForPmt.push([packet, offset, result]);
        } else {
          this.processPes_(packet, offset, result);
        }
      };

      this.processPes_ = function (packet, offset, result) {
        // set the appropriate stream type
        if (result.pid === this.programMapTable.video) {
          result.streamType = streamTypes.H264_STREAM_TYPE;
        } else if (result.pid === this.programMapTable.audio) {
          result.streamType = streamTypes.ADTS_STREAM_TYPE;
        } else {
          // if not video or audio, it is timed-metadata or unknown
          // if unknown, streamType will be undefined
          result.streamType = this.programMapTable['timed-metadata'][result.pid];
        }

        result.type = 'pes';
        result.data = packet.subarray(offset);
        this.trigger('data', result);
      };
    };
    _TransportParseStream.prototype = new stream();
    _TransportParseStream.STREAM_TYPES = {
      h264: 0x1b,
      adts: 0x0f
    };

    /**
     * Reconsistutes program elementary stream (PES) packets from parsed
     * transport stream packets. That is, if you pipe an
     * mp2t.TransportParseStream into a mp2t.ElementaryStream, the output
     * events will be events which capture the bytes for individual PES
     * packets plus relevant metadata that has been extracted from the
     * container.
     */
    _ElementaryStream = function ElementaryStream() {
      var self = this,


      // PES packet fragments
      video = {
        data: [],
        size: 0
      },
          audio = {
        data: [],
        size: 0
      },
          timedMetadata = {
        data: [],
        size: 0
      },
          programMapTable,
          parsePes = function parsePes(payload, pes) {
        var ptsDtsFlags;

        // get the packet length, this will be 0 for video
        pes.packetLength = 6 + (payload[4] << 8 | payload[5]);

        // find out if this packets starts a new keyframe
        pes.dataAlignmentIndicator = (payload[6] & 0x04) !== 0;
        // PES packets may be annotated with a PTS value, or a PTS value
        // and a DTS value. Determine what combination of values is
        // available to work with.
        ptsDtsFlags = payload[7];

        // PTS and DTS are normally stored as a 33-bit number.  Javascript
        // performs all bitwise operations on 32-bit integers but javascript
        // supports a much greater range (52-bits) of integer using standard
        // mathematical operations.
        // We construct a 31-bit value using bitwise operators over the 31
        // most significant bits and then multiply by 4 (equal to a left-shift
        // of 2) before we add the final 2 least significant bits of the
        // timestamp (equal to an OR.)
        if (ptsDtsFlags & 0xC0) {
          // the PTS and DTS are not written out directly. For information
          // on how they are encoded, see
          // http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
          pes.pts = (payload[9] & 0x0E) << 27 | (payload[10] & 0xFF) << 20 | (payload[11] & 0xFE) << 12 | (payload[12] & 0xFF) << 5 | (payload[13] & 0xFE) >>> 3;
          pes.pts *= 4; // Left shift by 2
          pes.pts += (payload[13] & 0x06) >>> 1; // OR by the two LSBs
          pes.dts = pes.pts;
          if (ptsDtsFlags & 0x40) {
            pes.dts = (payload[14] & 0x0E) << 27 | (payload[15] & 0xFF) << 20 | (payload[16] & 0xFE) << 12 | (payload[17] & 0xFF) << 5 | (payload[18] & 0xFE) >>> 3;
            pes.dts *= 4; // Left shift by 2
            pes.dts += (payload[18] & 0x06) >>> 1; // OR by the two LSBs
          }
        }
        // the data section starts immediately after the PES header.
        // pes_header_data_length specifies the number of header bytes
        // that follow the last byte of the field.
        pes.data = payload.subarray(9 + payload[8]);
      },


      /**
        * Pass completely parsed PES packets to the next stream in the pipeline
       **/
      flushStream = function flushStream(stream$$1, type, forceFlush) {
        var packetData = new Uint8Array(stream$$1.size),
            event = {
          type: type
        },
            i = 0,
            offset = 0,
            packetFlushable = false,
            fragment;

        // do nothing if there is not enough buffered data for a complete
        // PES header
        if (!stream$$1.data.length || stream$$1.size < 9) {
          return;
        }
        event.trackId = stream$$1.data[0].pid;

        // reassemble the packet
        for (i = 0; i < stream$$1.data.length; i++) {
          fragment = stream$$1.data[i];

          packetData.set(fragment.data, offset);
          offset += fragment.data.byteLength;
        }

        // parse assembled packet's PES header
        parsePes(packetData, event);

        // non-video PES packets MUST have a non-zero PES_packet_length
        // check that there is enough stream data to fill the packet
        packetFlushable = type === 'video' || event.packetLength <= stream$$1.size;

        // flush pending packets if the conditions are right
        if (forceFlush || packetFlushable) {
          stream$$1.size = 0;
          stream$$1.data.length = 0;
        }

        // only emit packets that are complete. this is to avoid assembling
        // incomplete PES packets due to poor segmentation
        if (packetFlushable) {
          self.trigger('data', event);
        }
      };

      _ElementaryStream.prototype.init.call(this);

      /**
       * Identifies M2TS packet types and parses PES packets using metadata
       * parsed from the PMT
       **/
      this.push = function (data) {
        ({
          pat: function pat() {
            // we have to wait for the PMT to arrive as well before we
            // have any meaningful metadata
          },
          pes: function pes() {
            var stream$$1, streamType;

            switch (data.streamType) {
              case streamTypes.H264_STREAM_TYPE:
              case streamTypes.H264_STREAM_TYPE:
                stream$$1 = video;
                streamType = 'video';
                break;
              case streamTypes.ADTS_STREAM_TYPE:
                stream$$1 = audio;
                streamType = 'audio';
                break;
              case streamTypes.METADATA_STREAM_TYPE:
                stream$$1 = timedMetadata;
                streamType = 'timed-metadata';
                break;
              default:
                // ignore unknown stream types
                return;
            }

            // if a new packet is starting, we can flush the completed
            // packet
            if (data.payloadUnitStartIndicator) {
              flushStream(stream$$1, streamType, true);
            }

            // buffer this fragment until we are sure we've received the
            // complete payload
            stream$$1.data.push(data);
            stream$$1.size += data.data.byteLength;
          },
          pmt: function pmt() {
            var event = {
              type: 'metadata',
              tracks: []
            };

            programMapTable = data.programMapTable;

            // translate audio and video streams to tracks
            if (programMapTable.video !== null) {
              event.tracks.push({
                timelineStartInfo: {
                  baseMediaDecodeTime: 0
                },
                id: +programMapTable.video,
                codec: 'avc',
                type: 'video'
              });
            }
            if (programMapTable.audio !== null) {
              event.tracks.push({
                timelineStartInfo: {
                  baseMediaDecodeTime: 0
                },
                id: +programMapTable.audio,
                codec: 'adts',
                type: 'audio'
              });
            }

            self.trigger('data', event);
          }
        })[data.type]();
      };

      this.reset = function () {
        video.size = 0;
        video.data.length = 0;
        audio.size = 0;
        audio.data.length = 0;
        this.trigger('reset');
      };

      /**
       * Flush any remaining input. Video PES packets may be of variable
       * length. Normally, the start of a new video packet can trigger the
       * finalization of the previous packet. That is not possible if no
       * more video is forthcoming, however. In that case, some other
       * mechanism (like the end of the file) has to be employed. When it is
       * clear that no additional data is forthcoming, calling this method
       * will flush the buffered packets.
       */
      this.flushStreams_ = function () {
        // !!THIS ORDER IS IMPORTANT!!
        // video first then audio
        flushStream(video, 'video');
        flushStream(audio, 'audio');
        flushStream(timedMetadata, 'timed-metadata');
      };

      this.flush = function () {
        this.flushStreams_();
        this.trigger('done');
      };
    };
    _ElementaryStream.prototype = new stream();

    var m2ts = {
      PAT_PID: 0x0000,
      MP2T_PACKET_LENGTH: MP2T_PACKET_LENGTH,
      TransportPacketStream: _TransportPacketStream,
      TransportParseStream: _TransportParseStream,
      ElementaryStream: _ElementaryStream,
      TimestampRolloverStream: TimestampRolloverStream$1,
      CaptionStream: captionStream.CaptionStream,
      Cea608Stream: captionStream.Cea608Stream,
      MetadataStream: metadataStream
    };

    for (var type in streamTypes) {
      if (streamTypes.hasOwnProperty(type)) {
        m2ts[type] = streamTypes[type];
      }
    }

    var m2ts_1 = m2ts;

    var ONE_SECOND_IN_TS$2 = clock.ONE_SECOND_IN_TS;

    var _AdtsStream;

    var ADTS_SAMPLING_FREQUENCIES = [96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350];

    /*
     * Accepts a ElementaryStream and emits data events with parsed
     * AAC Audio Frames of the individual packets. Input audio in ADTS
     * format is unpacked and re-emitted as AAC frames.
     *
     * @see http://wiki.multimedia.cx/index.php?title=ADTS
     * @see http://wiki.multimedia.cx/?title=Understanding_AAC
     */
    _AdtsStream = function AdtsStream(handlePartialSegments) {
      var buffer,
          frameNum = 0;

      _AdtsStream.prototype.init.call(this);

      this.push = function (packet) {
        var i = 0,
            frameLength,
            protectionSkipBytes,
            frameEnd,
            oldBuffer,
            sampleCount,
            adtsFrameDuration;

        if (!handlePartialSegments) {
          frameNum = 0;
        }

        if (packet.type !== 'audio') {
          // ignore non-audio data
          return;
        }

        // Prepend any data in the buffer to the input data so that we can parse
        // aac frames the cross a PES packet boundary
        if (buffer) {
          oldBuffer = buffer;
          buffer = new Uint8Array(oldBuffer.byteLength + packet.data.byteLength);
          buffer.set(oldBuffer);
          buffer.set(packet.data, oldBuffer.byteLength);
        } else {
          buffer = packet.data;
        }

        // unpack any ADTS frames which have been fully received
        // for details on the ADTS header, see http://wiki.multimedia.cx/index.php?title=ADTS
        while (i + 5 < buffer.length) {

          // Look for the start of an ADTS header..
          if (buffer[i] !== 0xFF || (buffer[i + 1] & 0xF6) !== 0xF0) {
            // If a valid header was not found,  jump one forward and attempt to
            // find a valid ADTS header starting at the next byte
            i++;
            continue;
          }

          // The protection skip bit tells us if we have 2 bytes of CRC data at the
          // end of the ADTS header
          protectionSkipBytes = (~buffer[i + 1] & 0x01) * 2;

          // Frame length is a 13 bit integer starting 16 bits from the
          // end of the sync sequence
          frameLength = (buffer[i + 3] & 0x03) << 11 | buffer[i + 4] << 3 | (buffer[i + 5] & 0xe0) >> 5;

          sampleCount = ((buffer[i + 6] & 0x03) + 1) * 1024;
          adtsFrameDuration = sampleCount * ONE_SECOND_IN_TS$2 / ADTS_SAMPLING_FREQUENCIES[(buffer[i + 2] & 0x3c) >>> 2];

          frameEnd = i + frameLength;

          // If we don't have enough data to actually finish this ADTS frame, return
          // and wait for more data
          if (buffer.byteLength < frameEnd) {
            return;
          }

          // Otherwise, deliver the complete AAC frame
          this.trigger('data', {
            pts: packet.pts + frameNum * adtsFrameDuration,
            dts: packet.dts + frameNum * adtsFrameDuration,
            sampleCount: sampleCount,
            audioobjecttype: (buffer[i + 2] >>> 6 & 0x03) + 1,
            channelcount: (buffer[i + 2] & 1) << 2 | (buffer[i + 3] & 0xc0) >>> 6,
            samplerate: ADTS_SAMPLING_FREQUENCIES[(buffer[i + 2] & 0x3c) >>> 2],
            samplingfrequencyindex: (buffer[i + 2] & 0x3c) >>> 2,
            // assume ISO/IEC 14496-12 AudioSampleEntry default of 16
            samplesize: 16,
            data: buffer.subarray(i + 7 + protectionSkipBytes, frameEnd)
          });

          frameNum++;

          // If the buffer is empty, clear it and return
          if (buffer.byteLength === frameEnd) {
            buffer = undefined;
            return;
          }

          // Remove the finished frame from the buffer and start the process again
          buffer = buffer.subarray(frameEnd);
        }
      };

      this.flush = function () {
        frameNum = 0;
        this.trigger('done');
      };

      this.reset = function () {
        buffer = void 0;
        this.trigger('reset');
      };

      this.endTimeline = function () {
        buffer = void 0;
        this.trigger('endedtimeline');
      };
    };

    _AdtsStream.prototype = new stream();

    var adts = _AdtsStream;

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     */

    var ExpGolomb;

    /**
     * Parser for exponential Golomb codes, a variable-bitwidth number encoding
     * scheme used by h264.
     */
    ExpGolomb = function ExpGolomb(workingData) {
      var
      // the number of bytes left to examine in workingData
      workingBytesAvailable = workingData.byteLength,


      // the current word being examined
      workingWord = 0,

      // :uint

      // the number of bits left to examine in the current word
      workingBitsAvailable = 0; // :uint;

      // ():uint
      this.length = function () {
        return 8 * workingBytesAvailable;
      };

      // ():uint
      this.bitsAvailable = function () {
        return 8 * workingBytesAvailable + workingBitsAvailable;
      };

      // ():void
      this.loadWord = function () {
        var position = workingData.byteLength - workingBytesAvailable,
            workingBytes = new Uint8Array(4),
            availableBytes = Math.min(4, workingBytesAvailable);

        if (availableBytes === 0) {
          throw new Error('no bytes available');
        }

        workingBytes.set(workingData.subarray(position, position + availableBytes));
        workingWord = new DataView(workingBytes.buffer).getUint32(0);

        // track the amount of workingData that has been processed
        workingBitsAvailable = availableBytes * 8;
        workingBytesAvailable -= availableBytes;
      };

      // (count:int):void
      this.skipBits = function (count) {
        var skipBytes; // :int
        if (workingBitsAvailable > count) {
          workingWord <<= count;
          workingBitsAvailable -= count;
        } else {
          count -= workingBitsAvailable;
          skipBytes = Math.floor(count / 8);

          count -= skipBytes * 8;
          workingBytesAvailable -= skipBytes;

          this.loadWord();

          workingWord <<= count;
          workingBitsAvailable -= count;
        }
      };

      // (size:int):uint
      this.readBits = function (size) {
        var bits = Math.min(workingBitsAvailable, size),

        // :uint
        valu = workingWord >>> 32 - bits; // :uint
        // if size > 31, handle error
        workingBitsAvailable -= bits;
        if (workingBitsAvailable > 0) {
          workingWord <<= bits;
        } else if (workingBytesAvailable > 0) {
          this.loadWord();
        }

        bits = size - bits;
        if (bits > 0) {
          return valu << bits | this.readBits(bits);
        }
        return valu;
      };

      // ():uint
      this.skipLeadingZeros = function () {
        var leadingZeroCount; // :uint
        for (leadingZeroCount = 0; leadingZeroCount < workingBitsAvailable; ++leadingZeroCount) {
          if ((workingWord & 0x80000000 >>> leadingZeroCount) !== 0) {
            // the first bit of working word is 1
            workingWord <<= leadingZeroCount;
            workingBitsAvailable -= leadingZeroCount;
            return leadingZeroCount;
          }
        }

        // we exhausted workingWord and still have not found a 1
        this.loadWord();
        return leadingZeroCount + this.skipLeadingZeros();
      };

      // ():void
      this.skipUnsignedExpGolomb = function () {
        this.skipBits(1 + this.skipLeadingZeros());
      };

      // ():void
      this.skipExpGolomb = function () {
        this.skipBits(1 + this.skipLeadingZeros());
      };

      // ():uint
      this.readUnsignedExpGolomb = function () {
        var clz = this.skipLeadingZeros(); // :uint
        return this.readBits(clz + 1) - 1;
      };

      // ():int
      this.readExpGolomb = function () {
        var valu = this.readUnsignedExpGolomb(); // :int
        if (0x01 & valu) {
          // the number is odd if the low order bit is set
          return 1 + valu >>> 1; // add 1 to make it even, and divide by 2
        }
        return -1 * (valu >>> 1); // divide by two then make it negative
      };

      // Some convenience functions
      // :Boolean
      this.readBoolean = function () {
        return this.readBits(1) === 1;
      };

      // ():int
      this.readUnsignedByte = function () {
        return this.readBits(8);
      };

      this.loadWord();
    };

    var expGolomb = ExpGolomb;

    var _H264Stream, _NalByteStream;
    var PROFILES_WITH_OPTIONAL_SPS_DATA;

    /**
     * Accepts a NAL unit byte stream and unpacks the embedded NAL units.
     */
    _NalByteStream = function NalByteStream() {
      var syncPoint = 0,
          i,
          buffer;
      _NalByteStream.prototype.init.call(this);

      /*
       * Scans a byte stream and triggers a data event with the NAL units found.
       * @param {Object} data Event received from H264Stream
       * @param {Uint8Array} data.data The h264 byte stream to be scanned
       *
       * @see H264Stream.push
       */
      this.push = function (data) {
        var swapBuffer;

        if (!buffer) {
          buffer = data.data;
        } else {
          swapBuffer = new Uint8Array(buffer.byteLength + data.data.byteLength);
          swapBuffer.set(buffer);
          swapBuffer.set(data.data, buffer.byteLength);
          buffer = swapBuffer;
        }
        var len = buffer.byteLength;

        // Rec. ITU-T H.264, Annex B
        // scan for NAL unit boundaries

        // a match looks like this:
        // 0 0 1 .. NAL .. 0 0 1
        // ^ sync point        ^ i
        // or this:
        // 0 0 1 .. NAL .. 0 0 0
        // ^ sync point        ^ i

        // advance the sync point to a NAL start, if necessary
        for (; syncPoint < len - 3; syncPoint++) {
          if (buffer[syncPoint + 2] === 1) {
            // the sync point is properly aligned
            i = syncPoint + 5;
            break;
          }
        }

        while (i < len) {
          // look at the current byte to determine if we've hit the end of
          // a NAL unit boundary
          switch (buffer[i]) {
            case 0:
              // skip past non-sync sequences
              if (buffer[i - 1] !== 0) {
                i += 2;
                break;
              } else if (buffer[i - 2] !== 0) {
                i++;
                break;
              }

              // deliver the NAL unit if it isn't empty
              if (syncPoint + 3 !== i - 2) {
                this.trigger('data', buffer.subarray(syncPoint + 3, i - 2));
              }

              // drop trailing zeroes
              do {
                i++;
              } while (buffer[i] !== 1 && i < len);
              syncPoint = i - 2;
              i += 3;
              break;
            case 1:
              // skip past non-sync sequences
              if (buffer[i - 1] !== 0 || buffer[i - 2] !== 0) {
                i += 3;
                break;
              }

              // deliver the NAL unit
              this.trigger('data', buffer.subarray(syncPoint + 3, i - 2));
              syncPoint = i - 2;
              i += 3;
              break;
            default:
              // the current byte isn't a one or zero, so it cannot be part
              // of a sync sequence
              i += 3;
              break;
          }
        }
        // filter out the NAL units that were delivered
        buffer = buffer.subarray(syncPoint);
        i -= syncPoint;
        syncPoint = 0;
      };

      this.reset = function () {
        buffer = null;
        syncPoint = 0;
        this.trigger('reset');
      };

      this.flush = function () {
        // deliver the last buffered NAL unit
        if (buffer && buffer.byteLength > 3) {
          this.trigger('data', buffer.subarray(syncPoint + 3));
        }
        // reset the stream state
        buffer = null;
        syncPoint = 0;
        this.trigger('done');
      };

      this.endTimeline = function () {
        this.flush();
        this.trigger('endedtimeline');
      };
    };
    _NalByteStream.prototype = new stream();

    // values of profile_idc that indicate additional fields are included in the SPS
    // see Recommendation ITU-T H.264 (4/2013),
    // 7.3.2.1.1 Sequence parameter set data syntax
    PROFILES_WITH_OPTIONAL_SPS_DATA = {
      100: true,
      110: true,
      122: true,
      244: true,
      44: true,
      83: true,
      86: true,
      118: true,
      128: true,
      138: true,
      139: true,
      134: true
    };

    /**
     * Accepts input from a ElementaryStream and produces H.264 NAL unit data
     * events.
     */
    _H264Stream = function H264Stream() {
      var nalByteStream = new _NalByteStream(),
          self,
          trackId,
          currentPts,
          currentDts,
          discardEmulationPreventionBytes,
          readSequenceParameterSet,
          skipScalingList;

      _H264Stream.prototype.init.call(this);
      self = this;

      /*
       * Pushes a packet from a stream onto the NalByteStream
       *
       * @param {Object} packet - A packet received from a stream
       * @param {Uint8Array} packet.data - The raw bytes of the packet
       * @param {Number} packet.dts - Decode timestamp of the packet
       * @param {Number} packet.pts - Presentation timestamp of the packet
       * @param {Number} packet.trackId - The id of the h264 track this packet came from
       * @param {('video'|'audio')} packet.type - The type of packet
       *
       */
      this.push = function (packet) {
        if (packet.type !== 'video') {
          return;
        }
        trackId = packet.trackId;
        currentPts = packet.pts;
        currentDts = packet.dts;

        nalByteStream.push(packet);
      };

      /*
       * Identify NAL unit types and pass on the NALU, trackId, presentation and decode timestamps
       * for the NALUs to the next stream component.
       * Also, preprocess caption and sequence parameter NALUs.
       *
       * @param {Uint8Array} data - A NAL unit identified by `NalByteStream.push`
       * @see NalByteStream.push
       */
      nalByteStream.on('data', function (data) {
        var event = {
          trackId: trackId,
          pts: currentPts,
          dts: currentDts,
          data: data
        };

        switch (data[0] & 0x1f) {
          case 0x05:
            event.nalUnitType = 'slice_layer_without_partitioning_rbsp_idr';
            break;
          case 0x06:
            event.nalUnitType = 'sei_rbsp';
            event.escapedRBSP = discardEmulationPreventionBytes(data.subarray(1));
            break;
          case 0x07:
            event.nalUnitType = 'seq_parameter_set_rbsp';
            event.escapedRBSP = discardEmulationPreventionBytes(data.subarray(1));
            event.config = readSequenceParameterSet(event.escapedRBSP);
            break;
          case 0x08:
            event.nalUnitType = 'pic_parameter_set_rbsp';
            break;
          case 0x09:
            event.nalUnitType = 'access_unit_delimiter_rbsp';
            break;

          default:
            break;
        }
        // This triggers data on the H264Stream
        self.trigger('data', event);
      });
      nalByteStream.on('done', function () {
        self.trigger('done');
      });
      nalByteStream.on('partialdone', function () {
        self.trigger('partialdone');
      });
      nalByteStream.on('reset', function () {
        self.trigger('reset');
      });
      nalByteStream.on('endedtimeline', function () {
        self.trigger('endedtimeline');
      });

      this.flush = function () {
        nalByteStream.flush();
      };

      this.partialFlush = function () {
        nalByteStream.partialFlush();
      };

      this.reset = function () {
        nalByteStream.reset();
      };

      this.endTimeline = function () {
        nalByteStream.endTimeline();
      };

      /**
       * Advance the ExpGolomb decoder past a scaling list. The scaling
       * list is optionally transmitted as part of a sequence parameter
       * set and is not relevant to transmuxing.
       * @param count {number} the number of entries in this scaling list
       * @param expGolombDecoder {object} an ExpGolomb pointed to the
       * start of a scaling list
       * @see Recommendation ITU-T H.264, Section 7.3.2.1.1.1
       */
      skipScalingList = function skipScalingList(count, expGolombDecoder) {
        var lastScale = 8,
            nextScale = 8,
            j,
            deltaScale;

        for (j = 0; j < count; j++) {
          if (nextScale !== 0) {
            deltaScale = expGolombDecoder.readExpGolomb();
            nextScale = (lastScale + deltaScale + 256) % 256;
          }

          lastScale = nextScale === 0 ? lastScale : nextScale;
        }
      };

      /**
       * Expunge any "Emulation Prevention" bytes from a "Raw Byte
       * Sequence Payload"
       * @param data {Uint8Array} the bytes of a RBSP from a NAL
       * unit
       * @return {Uint8Array} the RBSP without any Emulation
       * Prevention Bytes
       */
      discardEmulationPreventionBytes = function discardEmulationPreventionBytes(data) {
        var length = data.byteLength,
            emulationPreventionBytesPositions = [],
            i = 1,
            newLength,
            newData;

        // Find all `Emulation Prevention Bytes`
        while (i < length - 2) {
          if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {
            emulationPreventionBytesPositions.push(i + 2);
            i += 2;
          } else {
            i++;
          }
        }

        // If no Emulation Prevention Bytes were found just return the original
        // array
        if (emulationPreventionBytesPositions.length === 0) {
          return data;
        }

        // Create a new array to hold the NAL unit data
        newLength = length - emulationPreventionBytesPositions.length;
        newData = new Uint8Array(newLength);
        var sourceIndex = 0;

        for (i = 0; i < newLength; sourceIndex++, i++) {
          if (sourceIndex === emulationPreventionBytesPositions[0]) {
            // Skip this byte
            sourceIndex++;
            // Remove this position index
            emulationPreventionBytesPositions.shift();
          }
          newData[i] = data[sourceIndex];
        }

        return newData;
      };

      /**
       * Read a sequence parameter set and return some interesting video
       * properties. A sequence parameter set is the H264 metadata that
       * describes the properties of upcoming video frames.
       * @param data {Uint8Array} the bytes of a sequence parameter set
       * @return {object} an object with configuration parsed from the
       * sequence parameter set, including the dimensions of the
       * associated video frames.
       */
      readSequenceParameterSet = function readSequenceParameterSet(data) {
        var frameCropLeftOffset = 0,
            frameCropRightOffset = 0,
            frameCropTopOffset = 0,
            frameCropBottomOffset = 0,
            sarScale = 1,
            expGolombDecoder,
            profileIdc,
            levelIdc,
            profileCompatibility,
            chromaFormatIdc,
            picOrderCntType,
            numRefFramesInPicOrderCntCycle,
            picWidthInMbsMinus1,
            picHeightInMapUnitsMinus1,
            frameMbsOnlyFlag,
            scalingListCount,
            sarRatio,
            aspectRatioIdc,
            i;

        expGolombDecoder = new expGolomb(data);
        profileIdc = expGolombDecoder.readUnsignedByte(); // profile_idc
        profileCompatibility = expGolombDecoder.readUnsignedByte(); // constraint_set[0-5]_flag
        levelIdc = expGolombDecoder.readUnsignedByte(); // level_idc u(8)
        expGolombDecoder.skipUnsignedExpGolomb(); // seq_parameter_set_id

        // some profiles have more optional data we don't need
        if (PROFILES_WITH_OPTIONAL_SPS_DATA[profileIdc]) {
          chromaFormatIdc = expGolombDecoder.readUnsignedExpGolomb();
          if (chromaFormatIdc === 3) {
            expGolombDecoder.skipBits(1); // separate_colour_plane_flag
          }
          expGolombDecoder.skipUnsignedExpGolomb(); // bit_depth_luma_minus8
          expGolombDecoder.skipUnsignedExpGolomb(); // bit_depth_chroma_minus8
          expGolombDecoder.skipBits(1); // qpprime_y_zero_transform_bypass_flag
          if (expGolombDecoder.readBoolean()) {
            // seq_scaling_matrix_present_flag
            scalingListCount = chromaFormatIdc !== 3 ? 8 : 12;
            for (i = 0; i < scalingListCount; i++) {
              if (expGolombDecoder.readBoolean()) {
                // seq_scaling_list_present_flag[ i ]
                if (i < 6) {
                  skipScalingList(16, expGolombDecoder);
                } else {
                  skipScalingList(64, expGolombDecoder);
                }
              }
            }
          }
        }

        expGolombDecoder.skipUnsignedExpGolomb(); // log2_max_frame_num_minus4
        picOrderCntType = expGolombDecoder.readUnsignedExpGolomb();

        if (picOrderCntType === 0) {
          expGolombDecoder.readUnsignedExpGolomb(); // log2_max_pic_order_cnt_lsb_minus4
        } else if (picOrderCntType === 1) {
          expGolombDecoder.skipBits(1); // delta_pic_order_always_zero_flag
          expGolombDecoder.skipExpGolomb(); // offset_for_non_ref_pic
          expGolombDecoder.skipExpGolomb(); // offset_for_top_to_bottom_field
          numRefFramesInPicOrderCntCycle = expGolombDecoder.readUnsignedExpGolomb();
          for (i = 0; i < numRefFramesInPicOrderCntCycle; i++) {
            expGolombDecoder.skipExpGolomb(); // offset_for_ref_frame[ i ]
          }
        }

        expGolombDecoder.skipUnsignedExpGolomb(); // max_num_ref_frames
        expGolombDecoder.skipBits(1); // gaps_in_frame_num_value_allowed_flag

        picWidthInMbsMinus1 = expGolombDecoder.readUnsignedExpGolomb();
        picHeightInMapUnitsMinus1 = expGolombDecoder.readUnsignedExpGolomb();

        frameMbsOnlyFlag = expGolombDecoder.readBits(1);
        if (frameMbsOnlyFlag === 0) {
          expGolombDecoder.skipBits(1); // mb_adaptive_frame_field_flag
        }

        expGolombDecoder.skipBits(1); // direct_8x8_inference_flag
        if (expGolombDecoder.readBoolean()) {
          // frame_cropping_flag
          frameCropLeftOffset = expGolombDecoder.readUnsignedExpGolomb();
          frameCropRightOffset = expGolombDecoder.readUnsignedExpGolomb();
          frameCropTopOffset = expGolombDecoder.readUnsignedExpGolomb();
          frameCropBottomOffset = expGolombDecoder.readUnsignedExpGolomb();
        }
        if (expGolombDecoder.readBoolean()) {
          // vui_parameters_present_flag
          if (expGolombDecoder.readBoolean()) {
            // aspect_ratio_info_present_flag
            aspectRatioIdc = expGolombDecoder.readUnsignedByte();
            switch (aspectRatioIdc) {
              case 1:
                sarRatio = [1, 1];break;
              case 2:
                sarRatio = [12, 11];break;
              case 3:
                sarRatio = [10, 11];break;
              case 4:
                sarRatio = [16, 11];break;
              case 5:
                sarRatio = [40, 33];break;
              case 6:
                sarRatio = [24, 11];break;
              case 7:
                sarRatio = [20, 11];break;
              case 8:
                sarRatio = [32, 11];break;
              case 9:
                sarRatio = [80, 33];break;
              case 10:
                sarRatio = [18, 11];break;
              case 11:
                sarRatio = [15, 11];break;
              case 12:
                sarRatio = [64, 33];break;
              case 13:
                sarRatio = [160, 99];break;
              case 14:
                sarRatio = [4, 3];break;
              case 15:
                sarRatio = [3, 2];break;
              case 16:
                sarRatio = [2, 1];break;
              case 255:
                {
                  sarRatio = [expGolombDecoder.readUnsignedByte() << 8 | expGolombDecoder.readUnsignedByte(), expGolombDecoder.readUnsignedByte() << 8 | expGolombDecoder.readUnsignedByte()];
                  break;
                }
            }
            if (sarRatio) {
              sarScale = sarRatio[0] / sarRatio[1];
            }
          }
        }
        return {
          profileIdc: profileIdc,
          levelIdc: levelIdc,
          profileCompatibility: profileCompatibility,
          width: Math.ceil(((picWidthInMbsMinus1 + 1) * 16 - frameCropLeftOffset * 2 - frameCropRightOffset * 2) * sarScale),
          height: (2 - frameMbsOnlyFlag) * (picHeightInMapUnitsMinus1 + 1) * 16 - frameCropTopOffset * 2 - frameCropBottomOffset * 2,
          sarRatio: sarRatio
        };
      };
    };
    _H264Stream.prototype = new stream();

    var h264 = {
      H264Stream: _H264Stream,
      NalByteStream: _NalByteStream
    };

    /**
     * mux.js
     *
     * Copyright (c) Brightcove
     * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
     *
     * Utilities to detect basic properties and metadata about Aac data.
     */

    var ADTS_SAMPLING_FREQUENCIES$1 = [96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350];

    var isLikelyAacData = function isLikelyAacData(data) {
      if (data[0] === 'I'.charCodeAt(0) && data[1] === 'D'.charCodeAt(0) && data[2] === '3'.charCodeAt(0)) {
        return true;
      }
      return false;
    };

    var parseSyncSafeInteger$1 = function parseSyncSafeInteger(data) {
      return data[0] << 21 | data[1] << 14 | data[2] << 7 | data[3];
    };

    // return a percent-encoded representation of the specified byte range
    // @see http://en.wikipedia.org/wiki/Percent-encoding
    var percentEncode$1 = function percentEncode(bytes, start, end) {
      var i,
          result = '';
      for (i = start; i < end; i++) {
        result += '%' + ('00' + bytes[i].toString(16)).slice(-2);
      }
      return result;
    };

    // return the string representation of the specified byte range,
    // interpreted as ISO-8859-1.
    var parseIso88591$1 = function parseIso88591(bytes, start, end) {
      return unescape(percentEncode$1(bytes, start, end)); // jshint ignore:line
    };

    var parseId3TagSize = function parseId3TagSize(header, byteIndex) {
      var returnSize = header[byteIndex + 6] << 21 | header[byteIndex + 7] << 14 | header[byteIndex + 8] << 7 | header[byteIndex + 9],
          flags = header[byteIndex + 5],
          footerPresent = (flags & 16) >> 4;

      if (footerPresent) {
        return returnSize + 20;
      }
      return returnSize + 10;
    };

    var parseAdtsSize = function parseAdtsSize(header, byteIndex) {
      var lowThree = (header[byteIndex + 5] & 0xE0) >> 5,
          middle = header[byteIndex + 4] << 3,
          highTwo = header[byteIndex + 3] & 0x3 << 11;

      return highTwo | middle | lowThree;
    };

    var parseType = function parseType(header, byteIndex) {
      if (header[byteIndex] === 'I'.charCodeAt(0) && header[byteIndex + 1] === 'D'.charCodeAt(0) && header[byteIndex + 2] === '3'.charCodeAt(0)) {
        return 'timed-metadata';
      } else if (header[byteIndex] & 0xff === 0xff && (header[byteIndex + 1] & 0xf0) === 0xf0) {
        return 'audio';
      }
      return null;
    };

    var parseSampleRate = function parseSampleRate(packet) {
      var i = 0;

      while (i + 5 < packet.length) {
        if (packet[i] !== 0xFF || (packet[i + 1] & 0xF6) !== 0xF0) {
          // If a valid header was not found,  jump one forward and attempt to
          // find a valid ADTS header starting at the next byte
          i++;
          continue;
        }
        return ADTS_SAMPLING_FREQUENCIES$1[(packet[i + 2] & 0x3c) >>> 2];
      }

      return null;
    };

    var parseAacTimestamp = function parseAacTimestamp(packet) {
      var frameStart, frameSize, frame, frameHeader;

      // find the start of the first frame and the end of the tag
      frameStart = 10;
      if (packet[5] & 0x40) {
        // advance the frame start past the extended header
        frameStart += 4; // header size field
        frameStart += parseSyncSafeInteger$1(packet.subarray(10, 14));
      }

      // parse one or more ID3 frames
      // http://id3.org/id3v2.3.0#ID3v2_frame_overview
      do {
        // determine the number of bytes in this frame
        frameSize = parseSyncSafeInteger$1(packet.subarray(frameStart + 4, frameStart + 8));
        if (frameSize < 1) {
          return null;
        }
        frameHeader = String.fromCharCode(packet[frameStart], packet[frameStart + 1], packet[frameStart + 2], packet[frameStart + 3]);

        if (frameHeader === 'PRIV') {
          frame = packet.subarray(frameStart + 10, frameStart + frameSize + 10);

          for (var i = 0; i < frame.byteLength; i++) {
            if (frame[i] === 0) {
              var owner = parseIso88591$1(frame, 0, i);
              if (owner === 'com.apple.streaming.transportStreamTimestamp') {
                var d = frame.subarray(i + 1);
                var size = (d[3] & 0x01) << 30 | d[4] << 22 | d[5] << 14 | d[6] << 6 | d[7] >>> 2;
                size *= 4;
                size += d[7] & 0x03;

                return size;
              }
              break;
            }
          }
        }

        frameStart += 10; // advance past the frame header
        frameStart += frameSize; // advance past the frame body
      } while (frameStart < packet.byteLength);
      return null;
    };

    var utils = {
      isLikelyAacData: isLikelyAacData,
      parseId3TagSize: parseId3TagSize,
      parseAdtsSize: parseAdtsSize,
      parseType: parseType,
      parseSampleRate: parseSampleRate,
      parseAacTimestamp: parseAacTimestamp
    };

    // Constants
    var _AacStream;

    /**
     * Splits an incoming stream of binary data into ADTS and ID3 Frames.
     */

    _AacStream = function AacStream() {
      var everything = new Uint8Array(),
          timeStamp = 0;

      _AacStream.prototype.init.call(this);

      this.setTimestamp = function (timestamp) {
        timeStamp = timestamp;
      };

      this.push = function (bytes) {
        var frameSize = 0,
            byteIndex = 0,
            bytesLeft,
            chunk,
            packet,
            tempLength;

        // If there are bytes remaining from the last segment, prepend them to the
        // bytes that were pushed in
        if (everything.length) {
          tempLength = everything.length;
          everything = new Uint8Array(bytes.byteLength + tempLength);
          everything.set(everything.subarray(0, tempLength));
          everything.set(bytes, tempLength);
        } else {
          everything = bytes;
        }

        while (everything.length - byteIndex >= 3) {
          if (everything[byteIndex] === 'I'.charCodeAt(0) && everything[byteIndex + 1] === 'D'.charCodeAt(0) && everything[byteIndex + 2] === '3'.charCodeAt(0)) {

            // Exit early because we don't have enough to parse
            // the ID3 tag header
            if (everything.length - byteIndex < 10) {
              break;
            }

            // check framesize
            frameSize = utils.parseId3TagSize(everything, byteIndex);

            // Exit early if we don't have enough in the buffer
            // to emit a full packet
            // Add to byteIndex to support multiple ID3 tags in sequence
            if (byteIndex + frameSize > everything.length) {
              break;
            }
            chunk = {
              type: 'timed-metadata',
              data: everything.subarray(byteIndex, byteIndex + frameSize)
            };
            this.trigger('data', chunk);
            byteIndex += frameSize;
            continue;
          } else if ((everything[byteIndex] & 0xff) === 0xff && (everything[byteIndex + 1] & 0xf0) === 0xf0) {

            // Exit early because we don't have enough to parse
            // the ADTS frame header
            if (everything.length - byteIndex < 7) {
              break;
            }

            frameSize = utils.parseAdtsSize(everything, byteIndex);

            // Exit early if we don't have enough in the buffer
            // to emit a full packet
            if (byteIndex + frameSize > everything.length) {
              break;
            }

            packet = {
              type: 'audio',
              data: everything.subarray(byteIndex, byteIndex + frameSize),
              pts: timeStamp,
              dts: timeStamp
            };
            this.trigger('data', packet);
            byteIndex += frameSize;
            continue;
          }
          byteIndex++;
        }
        bytesLeft = everything.length - byteIndex;

        if (bytesLeft > 0) {
          everything = everything.subarray(byteIndex);
        } else {
          everything = new Uint8Array();
        }
      };

      this.reset = function () {
        everything = new Uint8Array();
        this.trigger('reset');
      };

      this.endTimeline = function () {
        everything = new Uint8Array();
        this.trigger('endedtimeline');
      };
    };

    _AacStream.prototype = new stream();

    var aac = _AacStream;

    var H264Stream = h264.H264Stream;

    var isLikelyAacData$1 = utils.isLikelyAacData;
    var ONE_SECOND_IN_TS$3 = clock.ONE_SECOND_IN_TS;

    // constants
    var AUDIO_PROPERTIES = ['audioobjecttype', 'channelcount', 'samplerate', 'samplingfrequencyindex', 'samplesize'];

    var VIDEO_PROPERTIES = ['width', 'height', 'profileIdc', 'levelIdc', 'profileCompatibility', 'sarRatio'];

    // object types
    var _VideoSegmentStream, _AudioSegmentStream, _Transmuxer, _CoalesceStream;

    /**
     * Compare two arrays (even typed) for same-ness
     */
    var arrayEquals = function arrayEquals(a, b) {
      var i;

      if (a.length !== b.length) {
        return false;
      }

      // compare the value of each element in the array
      for (i = 0; i < a.length; i++) {
        if (a[i] !== b[i]) {
          return false;
        }
      }

      return true;
    };

    var generateVideoSegmentTimingInfo = function generateVideoSegmentTimingInfo(baseMediaDecodeTime, startDts, startPts, endDts, endPts, prependedContentDuration) {
      var ptsOffsetFromDts = startPts - startDts,
          decodeDuration = endDts - startDts,
          presentationDuration = endPts - startPts;

      // The PTS and DTS values are based on the actual stream times from the segment,
      // however, the player time values will reflect a start from the baseMediaDecodeTime.
      // In order to provide relevant values for the player times, base timing info on the
      // baseMediaDecodeTime and the DTS and PTS durations of the segment.
      return {
        start: {
          dts: baseMediaDecodeTime,
          pts: baseMediaDecodeTime + ptsOffsetFromDts
        },
        end: {
          dts: baseMediaDecodeTime + decodeDuration,
          pts: baseMediaDecodeTime + presentationDuration
        },
        prependedContentDuration: prependedContentDuration,
        baseMediaDecodeTime: baseMediaDecodeTime
      };
    };

    /**
     * Constructs a single-track, ISO BMFF media segment from AAC data
     * events. The output of this stream can be fed to a SourceBuffer
     * configured with a suitable initialization segment.
     * @param track {object} track metadata configuration
     * @param options {object} transmuxer options object
     * @param options.keepOriginalTimestamps {boolean} If true, keep the timestamps
     *        in the source; false to adjust the first segment to start at 0.
     */
    _AudioSegmentStream = function AudioSegmentStream(track, options) {
      var adtsFrames = [],
          sequenceNumber = 0,
          earliestAllowedDts = 0,
          audioAppendStartTs = 0,
          videoBaseMediaDecodeTime = Infinity;

      options = options || {};

      _AudioSegmentStream.prototype.init.call(this);

      this.push = function (data) {
        trackDecodeInfo.collectDtsInfo(track, data);

        if (track) {
          AUDIO_PROPERTIES.forEach(function (prop) {
            track[prop] = data[prop];
          });
        }

        // buffer audio data until end() is called
        adtsFrames.push(data);
      };

      this.setEarliestDts = function (earliestDts) {
        earliestAllowedDts = earliestDts - track.timelineStartInfo.baseMediaDecodeTime;
      };

      this.setVideoBaseMediaDecodeTime = function (baseMediaDecodeTime) {
        videoBaseMediaDecodeTime = baseMediaDecodeTime;
      };

      this.setAudioAppendStart = function (timestamp) {
        audioAppendStartTs = timestamp;
      };

      this.flush = function () {
        var frames, moof, mdat, boxes, frameDuration;

        // return early if no audio data has been observed
        if (adtsFrames.length === 0) {
          this.trigger('done', 'AudioSegmentStream');
          return;
        }

        frames = audioFrameUtils.trimAdtsFramesByEarliestDts(adtsFrames, track, earliestAllowedDts);
        track.baseMediaDecodeTime = trackDecodeInfo.calculateTrackBaseMediaDecodeTime(track, options.keepOriginalTimestamps);

        audioFrameUtils.prefixWithSilence(track, frames, audioAppendStartTs, videoBaseMediaDecodeTime);

        // we have to build the index from byte locations to
        // samples (that is, adts frames) in the audio data
        track.samples = audioFrameUtils.generateSampleTable(frames);

        // concatenate the audio data to constuct the mdat
        mdat = mp4Generator.mdat(audioFrameUtils.concatenateFrameData(frames));

        adtsFrames = [];

        moof = mp4Generator.moof(sequenceNumber, [track]);
        boxes = new Uint8Array(moof.byteLength + mdat.byteLength);

        // bump the sequence number for next time
        sequenceNumber++;

        boxes.set(moof);
        boxes.set(mdat, moof.byteLength);

        trackDecodeInfo.clearDtsInfo(track);

        frameDuration = Math.ceil(ONE_SECOND_IN_TS$3 * 1024 / track.samplerate);

        // TODO this check was added to maintain backwards compatibility (particularly with
        // tests) on adding the timingInfo event. However, it seems unlikely that there's a
        // valid use-case where an init segment/data should be triggered without associated
        // frames. Leaving for now, but should be looked into.
        if (frames.length) {
          this.trigger('timingInfo', {
            start: frames[0].dts,
            end: frames[0].dts + frames.length * frameDuration
          });
        }
        this.trigger('data', { track: track, boxes: boxes });
        this.trigger('done', 'AudioSegmentStream');
      };

      this.reset = function () {
        trackDecodeInfo.clearDtsInfo(track);
        adtsFrames = [];
        this.trigger('reset');
      };
    };

    _AudioSegmentStream.prototype = new stream();

    /**
     * Constructs a single-track, ISO BMFF media segment from H264 data
     * events. The output of this stream can be fed to a SourceBuffer
     * configured with a suitable initialization segment.
     * @param track {object} track metadata configuration
     * @param options {object} transmuxer options object
     * @param options.alignGopsAtEnd {boolean} If true, start from the end of the
     *        gopsToAlignWith list when attempting to align gop pts
     * @param options.keepOriginalTimestamps {boolean} If true, keep the timestamps
     *        in the source; false to adjust the first segment to start at 0.
     */
    _VideoSegmentStream = function VideoSegmentStream(track, options) {
      var sequenceNumber = 0,
          nalUnits = [],
          gopsToAlignWith = [],
          config,
          pps;

      options = options || {};

      _VideoSegmentStream.prototype.init.call(this);

      delete track.minPTS;

      this.gopCache_ = [];

      /**
        * Constructs a ISO BMFF segment given H264 nalUnits
        * @param {Object} nalUnit A data event representing a nalUnit
        * @param {String} nalUnit.nalUnitType
        * @param {Object} nalUnit.config Properties for a mp4 track
        * @param {Uint8Array} nalUnit.data The nalUnit bytes
        * @see lib/codecs/h264.js
       **/
      this.push = function (nalUnit) {
        trackDecodeInfo.collectDtsInfo(track, nalUnit);

        // record the track config
        if (nalUnit.nalUnitType === 'seq_parameter_set_rbsp' && !config) {
          config = nalUnit.config;
          track.sps = [nalUnit.data];

          VIDEO_PROPERTIES.forEach(function (prop) {
            track[prop] = config[prop];
          }, this);
        }

        if (nalUnit.nalUnitType === 'pic_parameter_set_rbsp' && !pps) {
          pps = nalUnit.data;
          track.pps = [nalUnit.data];
        }

        // buffer video until flush() is called
        nalUnits.push(nalUnit);
      };

      /**
        * Pass constructed ISO BMFF track and boxes on to the
        * next stream in the pipeline
       **/
      this.flush = function () {
        var frames,
            gopForFusion,
            gops,
            moof,
            mdat,
            boxes,
            prependedContentDuration = 0,
            firstGop,
            lastGop;

        // Throw away nalUnits at the start of the byte stream until
        // we find the first AUD
        while (nalUnits.length) {
          if (nalUnits[0].nalUnitType === 'access_unit_delimiter_rbsp') {
            break;
          }
          nalUnits.shift();
        }

        // Return early if no video data has been observed
        if (nalUnits.length === 0) {
          this.resetStream_();
          this.trigger('done', 'VideoSegmentStream');
          return;
        }

        // Organize the raw nal-units into arrays that represent
        // higher-level constructs such as frames and gops
        // (group-of-pictures)
        frames = frameUtils.groupNalsIntoFrames(nalUnits);
        gops = frameUtils.groupFramesIntoGops(frames);

        // If the first frame of this fragment is not a keyframe we have
        // a problem since MSE (on Chrome) requires a leading keyframe.
        //
        // We have two approaches to repairing this situation:
        // 1) GOP-FUSION:
        //    This is where we keep track of the GOPS (group-of-pictures)
        //    from previous fragments and attempt to find one that we can
        //    prepend to the current fragment in order to create a valid
        //    fragment.
        // 2) KEYFRAME-PULLING:
        //    Here we search for the first keyframe in the fragment and
        //    throw away all the frames between the start of the fragment
        //    and that keyframe. We then extend the duration and pull the
        //    PTS of the keyframe forward so that it covers the time range
        //    of the frames that were disposed of.
        //
        // #1 is far prefereable over #2 which can cause "stuttering" but
        // requires more things to be just right.
        if (!gops[0][0].keyFrame) {
          // Search for a gop for fusion from our gopCache
          gopForFusion = this.getGopForFusion_(nalUnits[0], track);

          if (gopForFusion) {
            // in order to provide more accurate timing information about the segment, save
            // the number of seconds prepended to the original segment due to GOP fusion
            prependedContentDuration = gopForFusion.duration;

            gops.unshift(gopForFusion);
            // Adjust Gops' metadata to account for the inclusion of the
            // new gop at the beginning
            gops.byteLength += gopForFusion.byteLength;
            gops.nalCount += gopForFusion.nalCount;
            gops.pts = gopForFusion.pts;
            gops.dts = gopForFusion.dts;
            gops.duration += gopForFusion.duration;
          } else {
            // If we didn't find a candidate gop fall back to keyframe-pulling
            gops = frameUtils.extendFirstKeyFrame(gops);
          }
        }

        // Trim gops to align with gopsToAlignWith
        if (gopsToAlignWith.length) {
          var alignedGops;

          if (options.alignGopsAtEnd) {
            alignedGops = this.alignGopsAtEnd_(gops);
          } else {
            alignedGops = this.alignGopsAtStart_(gops);
          }

          if (!alignedGops) {
            // save all the nals in the last GOP into the gop cache
            this.gopCache_.unshift({
              gop: gops.pop(),
              pps: track.pps,
              sps: track.sps
            });

            // Keep a maximum of 6 GOPs in the cache
            this.gopCache_.length = Math.min(6, this.gopCache_.length);

            // Clear nalUnits
            nalUnits = [];

            // return early no gops can be aligned with desired gopsToAlignWith
            this.resetStream_();
            this.trigger('done', 'VideoSegmentStream');
            return;
          }

          // Some gops were trimmed. clear dts info so minSegmentDts and pts are correct
          // when recalculated before sending off to CoalesceStream
          trackDecodeInfo.clearDtsInfo(track);

          gops = alignedGops;
        }

        trackDecodeInfo.collectDtsInfo(track, gops);

        // First, we have to build the index from byte locations to
        // samples (that is, frames) in the video data
        track.samples = frameUtils.generateSampleTable(gops);

        // Concatenate the video data and construct the mdat
        mdat = mp4Generator.mdat(frameUtils.concatenateNalData(gops));

        track.baseMediaDecodeTime = trackDecodeInfo.calculateTrackBaseMediaDecodeTime(track, options.keepOriginalTimestamps);

        this.trigger('processedGopsInfo', gops.map(function (gop) {
          return {
            pts: gop.pts,
            dts: gop.dts,
            byteLength: gop.byteLength
          };
        }));

        firstGop = gops[0];
        lastGop = gops[gops.length - 1];

        this.trigger('segmentTimingInfo', generateVideoSegmentTimingInfo(track.baseMediaDecodeTime, firstGop.dts, firstGop.pts, lastGop.dts + lastGop.duration, lastGop.pts + lastGop.duration, prependedContentDuration));

        this.trigger('timingInfo', {
          start: gops[0].dts,
          end: gops[gops.length - 1].dts + gops[gops.length - 1].duration
        });

        // save all the nals in the last GOP into the gop cache
        this.gopCache_.unshift({
          gop: gops.pop(),
          pps: track.pps,
          sps: track.sps
        });

        // Keep a maximum of 6 GOPs in the cache
        this.gopCache_.length = Math.min(6, this.gopCache_.length);

        // Clear nalUnits
        nalUnits = [];

        this.trigger('baseMediaDecodeTime', track.baseMediaDecodeTime);
        this.trigger('timelineStartInfo', track.timelineStartInfo);

        moof = mp4Generator.moof(sequenceNumber, [track]);

        // it would be great to allocate this array up front instead of
        // throwing away hundreds of media segment fragments
        boxes = new Uint8Array(moof.byteLength + mdat.byteLength);

        // Bump the sequence number for next time
        sequenceNumber++;

        boxes.set(moof);
        boxes.set(mdat, moof.byteLength);

        this.trigger('data', { track: track, boxes: boxes });

        this.resetStream_();

        // Continue with the flush process now
        this.trigger('done', 'VideoSegmentStream');
      };

      this.reset = function () {
        this.resetStream_();
        nalUnits = [];
        this.gopCache_.length = 0;
        gopsToAlignWith.length = 0;
        this.trigger('reset');
      };

      this.resetStream_ = function () {
        trackDecodeInfo.clearDtsInfo(track);

        // reset config and pps because they may differ across segments
        // for instance, when we are rendition switching
        config = undefined;
        pps = undefined;
      };

      // Search for a candidate Gop for gop-fusion from the gop cache and
      // return it or return null if no good candidate was found
      this.getGopForFusion_ = function (nalUnit) {
        var halfSecond = 45000,

        // Half-a-second in a 90khz clock
        allowableOverlap = 10000,

        // About 3 frames @ 30fps
        nearestDistance = Infinity,
            dtsDistance,
            nearestGopObj,
            currentGop,
            currentGopObj,
            i;

        // Search for the GOP nearest to the beginning of this nal unit
        for (i = 0; i < this.gopCache_.length; i++) {
          currentGopObj = this.gopCache_[i];
          currentGop = currentGopObj.gop;

          // Reject Gops with different SPS or PPS
          if (!(track.pps && arrayEquals(track.pps[0], currentGopObj.pps[0])) || !(track.sps && arrayEquals(track.sps[0], currentGopObj.sps[0]))) {
            continue;
          }

          // Reject Gops that would require a negative baseMediaDecodeTime
          if (currentGop.dts < track.timelineStartInfo.dts) {
            continue;
          }

          // The distance between the end of the gop and the start of the nalUnit
          dtsDistance = nalUnit.dts - currentGop.dts - currentGop.duration;

          // Only consider GOPS that start before the nal unit and end within
          // a half-second of the nal unit
          if (dtsDistance >= -allowableOverlap && dtsDistance <= halfSecond) {

            // Always use the closest GOP we found if there is more than
            // one candidate
            if (!nearestGopObj || nearestDistance > dtsDistance) {
              nearestGopObj = currentGopObj;
              nearestDistance = dtsDistance;
            }
          }
        }

        if (nearestGopObj) {
          return nearestGopObj.gop;
        }
        return null;
      };

      // trim gop list to the first gop found that has a matching pts with a gop in the list
      // of gopsToAlignWith starting from the START of the list
      this.alignGopsAtStart_ = function (gops) {
        var alignIndex, gopIndex, align, gop, byteLength, nalCount, duration, alignedGops;

        byteLength = gops.byteLength;
        nalCount = gops.nalCount;
        duration = gops.duration;
        alignIndex = gopIndex = 0;

        while (alignIndex < gopsToAlignWith.length && gopIndex < gops.length) {
          align = gopsToAlignWith[alignIndex];
          gop = gops[gopIndex];

          if (align.pts === gop.pts) {
            break;
          }

          if (gop.pts > align.pts) {
            // this current gop starts after the current gop we want to align on, so increment
            // align index
            alignIndex++;
            continue;
          }

          // current gop starts before the current gop we want to align on. so increment gop
          // index
          gopIndex++;
          byteLength -= gop.byteLength;
          nalCount -= gop.nalCount;
          duration -= gop.duration;
        }

        if (gopIndex === 0) {
          // no gops to trim
          return gops;
        }

        if (gopIndex === gops.length) {
          // all gops trimmed, skip appending all gops
          return null;
        }

        alignedGops = gops.slice(gopIndex);
        alignedGops.byteLength = byteLength;
        alignedGops.duration = duration;
        alignedGops.nalCount = nalCount;
        alignedGops.pts = alignedGops[0].pts;
        alignedGops.dts = alignedGops[0].dts;

        return alignedGops;
      };

      // trim gop list to the first gop found that has a matching pts with a gop in the list
      // of gopsToAlignWith starting from the END of the list
      this.alignGopsAtEnd_ = function (gops) {
        var alignIndex, gopIndex, align, gop, alignEndIndex, matchFound;

        alignIndex = gopsToAlignWith.length - 1;
        gopIndex = gops.length - 1;
        alignEndIndex = null;
        matchFound = false;

        while (alignIndex >= 0 && gopIndex >= 0) {
          align = gopsToAlignWith[alignIndex];
          gop = gops[gopIndex];

          if (align.pts === gop.pts) {
            matchFound = true;
            break;
          }

          if (align.pts > gop.pts) {
            alignIndex--;
            continue;
          }

          if (alignIndex === gopsToAlignWith.length - 1) {
            // gop.pts is greater than the last alignment candidate. If no match is found
            // by the end of this loop, we still want to append gops that come after this
            // point
            alignEndIndex = gopIndex;
          }

          gopIndex--;
        }

        if (!matchFound && alignEndIndex === null) {
          return null;
        }

        var trimIndex;

        if (matchFound) {
          trimIndex = gopIndex;
        } else {
          trimIndex = alignEndIndex;
        }

        if (trimIndex === 0) {
          return gops;
        }

        var alignedGops = gops.slice(trimIndex);
        var metadata = alignedGops.reduce(function (total, gop) {
          total.byteLength += gop.byteLength;
          total.duration += gop.duration;
          total.nalCount += gop.nalCount;
          return total;
        }, { byteLength: 0, duration: 0, nalCount: 0 });

        alignedGops.byteLength = metadata.byteLength;
        alignedGops.duration = metadata.duration;
        alignedGops.nalCount = metadata.nalCount;
        alignedGops.pts = alignedGops[0].pts;
        alignedGops.dts = alignedGops[0].dts;

        return alignedGops;
      };

      this.alignGopsWith = function (newGopsToAlignWith) {
        gopsToAlignWith = newGopsToAlignWith;
      };
    };

    _VideoSegmentStream.prototype = new stream();

    /**
     * A Stream that can combine multiple streams (ie. audio & video)
     * into a single output segment for MSE. Also supports audio-only
     * and video-only streams.
     * @param options {object} transmuxer options object
     * @param options.keepOriginalTimestamps {boolean} If true, keep the timestamps
     *        in the source; false to adjust the first segment to start at media timeline start.
     */
    _CoalesceStream = function CoalesceStream(options, metadataStream) {
      // Number of Tracks per output segment
      // If greater than 1, we combine multiple
      // tracks into a single segment
      this.numberOfTracks = 0;
      this.metadataStream = metadataStream;

      options = options || {};

      if (typeof options.remux !== 'undefined') {
        this.remuxTracks = !!options.remux;
      } else {
        this.remuxTracks = true;
      }

      if (typeof options.keepOriginalTimestamps === 'boolean') {
        this.keepOriginalTimestamps = options.keepOriginalTimestamps;
      } else {
        this.keepOriginalTimestamps = false;
      }

      this.pendingTracks = [];
      this.videoTrack = null;
      this.pendingBoxes = [];
      this.pendingCaptions = [];
      this.pendingMetadata = [];
      this.pendingBytes = 0;
      this.emittedTracks = 0;

      _CoalesceStream.prototype.init.call(this);

      // Take output from multiple
      this.push = function (output) {
        // buffer incoming captions until the associated video segment
        // finishes
        if (output.text) {
          return this.pendingCaptions.push(output);
        }
        // buffer incoming id3 tags until the final flush
        if (output.frames) {
          return this.pendingMetadata.push(output);
        }

        // Add this track to the list of pending tracks and store
        // important information required for the construction of
        // the final segment
        this.pendingTracks.push(output.track);
        this.pendingBytes += output.boxes.byteLength;

        // TODO: is there an issue for this against chrome?
        // We unshift audio and push video because
        // as of Chrome 75 when switching from
        // one init segment to another if the video
        // mdat does not appear after the audio mdat
        // only audio will play for the duration of our transmux.
        if (output.track.type === 'video') {
          this.videoTrack = output.track;
          this.pendingBoxes.push(output.boxes);
        }
        if (output.track.type === 'audio') {
          this.audioTrack = output.track;
          this.pendingBoxes.unshift(output.boxes);
        }
      };
    };

    _CoalesceStream.prototype = new stream();
    _CoalesceStream.prototype.flush = function (flushSource) {
      var offset = 0,
          event = {
        captions: [],
        captionStreams: {},
        metadata: [],
        info: {}
      },
          caption,
          id3,
          initSegment,
          timelineStartPts = 0,
          i;

      if (this.pendingTracks.length < this.numberOfTracks) {
        if (flushSource !== 'VideoSegmentStream' && flushSource !== 'AudioSegmentStream') {
          // Return because we haven't received a flush from a data-generating
          // portion of the segment (meaning that we have only recieved meta-data
          // or captions.)
          return;
        } else if (this.remuxTracks) {
          // Return until we have enough tracks from the pipeline to remux (if we
          // are remuxing audio and video into a single MP4)
          return;
        } else if (this.pendingTracks.length === 0) {
          // In the case where we receive a flush without any data having been
          // received we consider it an emitted track for the purposes of coalescing
          // `done` events.
          // We do this for the case where there is an audio and video track in the
          // segment but no audio data. (seen in several playlists with alternate
          // audio tracks and no audio present in the main TS segments.)
          this.emittedTracks++;

          if (this.emittedTracks >= this.numberOfTracks) {
            this.trigger('done');
            this.emittedTracks = 0;
          }
          return;
        }
      }

      if (this.videoTrack) {
        timelineStartPts = this.videoTrack.timelineStartInfo.pts;
        VIDEO_PROPERTIES.forEach(function (prop) {
          event.info[prop] = this.videoTrack[prop];
        }, this);
      } else if (this.audioTrack) {
        timelineStartPts = this.audioTrack.timelineStartInfo.pts;
        AUDIO_PROPERTIES.forEach(function (prop) {
          event.info[prop] = this.audioTrack[prop];
        }, this);
      }

      if (this.videoTrack || this.audioTrack) {
        if (this.pendingTracks.length === 1) {
          event.type = this.pendingTracks[0].type;
        } else {
          event.type = 'combined';
        }

        this.emittedTracks += this.pendingTracks.length;

        initSegment = mp4Generator.initSegment(this.pendingTracks);

        // Create a new typed array to hold the init segment
        event.initSegment = new Uint8Array(initSegment.byteLength);

        // Create an init segment containing a moov
        // and track definitions
        event.initSegment.set(initSegment);

        // Create a new typed array to hold the moof+mdats
        event.data = new Uint8Array(this.pendingBytes);

        // Append each moof+mdat (one per track) together
        for (i = 0; i < this.pendingBoxes.length; i++) {
          event.data.set(this.pendingBoxes[i], offset);
          offset += this.pendingBoxes[i].byteLength;
        }

        // Translate caption PTS times into second offsets to match the
        // video timeline for the segment, and add track info
        for (i = 0; i < this.pendingCaptions.length; i++) {
          caption = this.pendingCaptions[i];
          caption.startTime = clock.metadataTsToSeconds(caption.startPts, timelineStartPts, this.keepOriginalTimestamps);
          caption.endTime = clock.metadataTsToSeconds(caption.endPts, timelineStartPts, this.keepOriginalTimestamps);

          event.captionStreams[caption.stream] = true;
          event.captions.push(caption);
        }

        // Translate ID3 frame PTS times into second offsets to match the
        // video timeline for the segment
        for (i = 0; i < this.pendingMetadata.length; i++) {
          id3 = this.pendingMetadata[i];
          id3.cueTime = clock.metadataTsToSeconds(id3.pts, timelineStartPts, this.keepOriginalTimestamps);

          event.metadata.push(id3);
        }

        // We add this to every single emitted segment even though we only need
        // it for the first
        event.metadata.dispatchType = this.metadataStream.dispatchType;

        // Reset stream state
        this.pendingTracks.length = 0;
        this.videoTrack = null;
        this.pendingBoxes.length = 0;
        this.pendingCaptions.length = 0;
        this.pendingBytes = 0;
        this.pendingMetadata.length = 0;

        // Emit the built segment
        // We include captions and ID3 tags for backwards compatibility,
        // ideally we should send only video and audio in the data event
        this.trigger('data', event);
        // Emit each caption to the outside world
        // Ideally, this would happen immediately on parsing captions,
        // but we need to ensure that video data is sent back first
        // so that caption timing can be adjusted to match video timing
        for (i = 0; i < event.captions.length; i++) {
          caption = event.captions[i];

          this.trigger('caption', caption);
        }
        // Emit each id3 tag to the outside world
        // Ideally, this would happen immediately on parsing the tag,
        // but we need to ensure that video data is sent back first
        // so that ID3 frame timing can be adjusted to match video timing
        for (i = 0; i < event.metadata.length; i++) {
          id3 = event.metadata[i];

          this.trigger('id3Frame', id3);
        }
      }

      // Only emit `done` if all tracks have been flushed and emitted
      if (this.emittedTracks >= this.numberOfTracks) {
        this.trigger('done');
        this.emittedTracks = 0;
      }
    };

    _CoalesceStream.prototype.setRemux = function (val) {
      this.remuxTracks = val;
    };
    /**
     * A Stream that expects MP2T binary data as input and produces
     * corresponding media segments, suitable for use with Media Source
     * Extension (MSE) implementations that support the ISO BMFF byte
     * stream format, like Chrome.
     */
    _Transmuxer = function Transmuxer(options) {
      var self = this,
          hasFlushed = true,
          videoTrack,
          audioTrack;

      _Transmuxer.prototype.init.call(this);

      options = options || {};
      this.baseMediaDecodeTime = options.baseMediaDecodeTime || 0;
      this.transmuxPipeline_ = {};

      this.setupAacPipeline = function () {
        var pipeline = {};
        this.transmuxPipeline_ = pipeline;

        pipeline.type = 'aac';
        pipeline.metadataStream = new m2ts_1.MetadataStream();

        // set up the parsing pipeline
        pipeline.aacStream = new aac();
        pipeline.audioTimestampRolloverStream = new m2ts_1.TimestampRolloverStream('audio');
        pipeline.timedMetadataTimestampRolloverStream = new m2ts_1.TimestampRolloverStream('timed-metadata');
        pipeline.adtsStream = new adts();
        pipeline.coalesceStream = new _CoalesceStream(options, pipeline.metadataStream);
        pipeline.headOfPipeline = pipeline.aacStream;

        pipeline.aacStream.pipe(pipeline.audioTimestampRolloverStream).pipe(pipeline.adtsStream);
        pipeline.aacStream.pipe(pipeline.timedMetadataTimestampRolloverStream).pipe(pipeline.metadataStream).pipe(pipeline.coalesceStream);

        pipeline.metadataStream.on('timestamp', function (frame) {
          pipeline.aacStream.setTimestamp(frame.timeStamp);
        });

        pipeline.aacStream.on('data', function (data) {
          if (data.type === 'timed-metadata' && !pipeline.audioSegmentStream) {
            audioTrack = audioTrack || {
              timelineStartInfo: {
                baseMediaDecodeTime: self.baseMediaDecodeTime
              },
              codec: 'adts',
              type: 'audio'
            };
            // hook up the audio segment stream to the first track with aac data
            pipeline.coalesceStream.numberOfTracks++;
            pipeline.audioSegmentStream = new _AudioSegmentStream(audioTrack, options);

            pipeline.audioSegmentStream.on('timingInfo', self.trigger.bind(self, 'audioTimingInfo'));

            // Set up the final part of the audio pipeline
            pipeline.adtsStream.pipe(pipeline.audioSegmentStream).pipe(pipeline.coalesceStream);
          }

          // emit pmt info
          self.trigger('trackinfo', {
            hasAudio: !!audioTrack,
            hasVideo: !!videoTrack
          });
        });

        // Re-emit any data coming from the coalesce stream to the outside world
        pipeline.coalesceStream.on('data', this.trigger.bind(this, 'data'));
        // Let the consumer know we have finished flushing the entire pipeline
        pipeline.coalesceStream.on('done', this.trigger.bind(this, 'done'));
      };

      this.setupTsPipeline = function () {
        var pipeline = {};
        this.transmuxPipeline_ = pipeline;

        pipeline.type = 'ts';
        pipeline.metadataStream = new m2ts_1.MetadataStream();

        // set up the parsing pipeline
        pipeline.packetStream = new m2ts_1.TransportPacketStream();
        pipeline.parseStream = new m2ts_1.TransportParseStream();
        pipeline.elementaryStream = new m2ts_1.ElementaryStream();
        pipeline.timestampRolloverStream = new m2ts_1.TimestampRolloverStream();
        pipeline.adtsStream = new adts();
        pipeline.h264Stream = new H264Stream();
        pipeline.captionStream = new m2ts_1.CaptionStream();
        pipeline.coalesceStream = new _CoalesceStream(options, pipeline.metadataStream);
        pipeline.headOfPipeline = pipeline.packetStream;

        // disassemble MPEG2-TS packets into elementary streams
        pipeline.packetStream.pipe(pipeline.parseStream).pipe(pipeline.elementaryStream).pipe(pipeline.timestampRolloverStream);

        // !!THIS ORDER IS IMPORTANT!!
        // demux the streams
        pipeline.timestampRolloverStream.pipe(pipeline.h264Stream);

        pipeline.timestampRolloverStream.pipe(pipeline.adtsStream);

        pipeline.timestampRolloverStream.pipe(pipeline.metadataStream).pipe(pipeline.coalesceStream);

        // Hook up CEA-608/708 caption stream
        pipeline.h264Stream.pipe(pipeline.captionStream).pipe(pipeline.coalesceStream);

        pipeline.elementaryStream.on('data', function (data) {
          var i;

          if (data.type === 'metadata') {
            i = data.tracks.length;

            // scan the tracks listed in the metadata
            while (i--) {
              if (!videoTrack && data.tracks[i].type === 'video') {
                videoTrack = data.tracks[i];
                videoTrack.timelineStartInfo.baseMediaDecodeTime = self.baseMediaDecodeTime;
              } else if (!audioTrack && data.tracks[i].type === 'audio') {
                audioTrack = data.tracks[i];
                audioTrack.timelineStartInfo.baseMediaDecodeTime = self.baseMediaDecodeTime;
              }
            }

            // hook up the video segment stream to the first track with h264 data
            if (videoTrack && !pipeline.videoSegmentStream) {
              pipeline.coalesceStream.numberOfTracks++;
              pipeline.videoSegmentStream = new _VideoSegmentStream(videoTrack, options);

              pipeline.videoSegmentStream.on('timelineStartInfo', function (timelineStartInfo) {
                // When video emits timelineStartInfo data after a flush, we forward that
                // info to the AudioSegmentStream, if it exists, because video timeline
                // data takes precedence.
                if (audioTrack) {
                  audioTrack.timelineStartInfo = timelineStartInfo;
                  // On the first segment we trim AAC frames that exist before the
                  // very earliest DTS we have seen in video because Chrome will
                  // interpret any video track with a baseMediaDecodeTime that is
                  // non-zero as a gap.
                  pipeline.audioSegmentStream.setEarliestDts(timelineStartInfo.dts);
                }
              });

              pipeline.videoSegmentStream.on('processedGopsInfo', self.trigger.bind(self, 'gopInfo'));
              pipeline.videoSegmentStream.on('segmentTimingInfo', self.trigger.bind(self, 'videoSegmentTimingInfo'));

              pipeline.videoSegmentStream.on('baseMediaDecodeTime', function (baseMediaDecodeTime) {
                if (audioTrack) {
                  pipeline.audioSegmentStream.setVideoBaseMediaDecodeTime(baseMediaDecodeTime);
                }
              });

              pipeline.videoSegmentStream.on('timingInfo', self.trigger.bind(self, 'videoTimingInfo'));

              // Set up the final part of the video pipeline
              pipeline.h264Stream.pipe(pipeline.videoSegmentStream).pipe(pipeline.coalesceStream);
            }

            if (audioTrack && !pipeline.audioSegmentStream) {
              // hook up the audio segment stream to the first track with aac data
              pipeline.coalesceStream.numberOfTracks++;
              pipeline.audioSegmentStream = new _AudioSegmentStream(audioTrack, options);

              pipeline.audioSegmentStream.on('timingInfo', self.trigger.bind(self, 'audioTimingInfo'));

              // Set up the final part of the audio pipeline
              pipeline.adtsStream.pipe(pipeline.audioSegmentStream).pipe(pipeline.coalesceStream);
            }

            // emit pmt info
            self.trigger('trackinfo', {
              hasAudio: !!audioTrack,
              hasVideo: !!videoTrack
            });
          }
        });

        // Re-emit any data coming from the coalesce stream to the outside world
        pipeline.coalesceStream.on('data', this.trigger.bind(this, 'data'));
        pipeline.coalesceStream.on('id3Frame', function (id3Frame) {
          id3Frame.dispatchType = pipeline.metadataStream.dispatchType;

          self.trigger('id3Frame', id3Frame);
        });
        pipeline.coalesceStream.on('caption', this.trigger.bind(this, 'caption'));
        // Let the consumer know we have finished flushing the entire pipeline
        pipeline.coalesceStream.on('done', this.trigger.bind(this, 'done'));
      };

      // hook up the segment streams once track metadata is delivered
      this.setBaseMediaDecodeTime = function (baseMediaDecodeTime) {
        var pipeline = this.transmuxPipeline_;

        if (!options.keepOriginalTimestamps) {
          this.baseMediaDecodeTime = baseMediaDecodeTime;
        }

        if (audioTrack) {
          audioTrack.timelineStartInfo.dts = undefined;
          audioTrack.timelineStartInfo.pts = undefined;
          trackDecodeInfo.clearDtsInfo(audioTrack);
          if (!options.keepOriginalTimestamps) {
            audioTrack.timelineStartInfo.baseMediaDecodeTime = baseMediaDecodeTime;
          }
          if (pipeline.audioTimestampRolloverStream) {
            pipeline.audioTimestampRolloverStream.discontinuity();
          }
        }
        if (videoTrack) {
          if (pipeline.videoSegmentStream) {
            pipeline.videoSegmentStream.gopCache_ = [];
          }
          videoTrack.timelineStartInfo.dts = undefined;
          videoTrack.timelineStartInfo.pts = undefined;
          trackDecodeInfo.clearDtsInfo(videoTrack);
          pipeline.captionStream.reset();
          if (!options.keepOriginalTimestamps) {
            videoTrack.timelineStartInfo.baseMediaDecodeTime = baseMediaDecodeTime;
          }
        }

        if (pipeline.timestampRolloverStream) {
          pipeline.timestampRolloverStream.discontinuity();
        }
      };

      this.setAudioAppendStart = function (timestamp) {
        if (audioTrack) {
          this.transmuxPipeline_.audioSegmentStream.setAudioAppendStart(timestamp);
        }
      };

      this.setRemux = function (val) {
        var pipeline = this.transmuxPipeline_;

        options.remux = val;

        if (pipeline && pipeline.coalesceStream) {
          pipeline.coalesceStream.setRemux(val);
        }
      };

      this.alignGopsWith = function (gopsToAlignWith) {
        if (videoTrack && this.transmuxPipeline_.videoSegmentStream) {
          this.transmuxPipeline_.videoSegmentStream.alignGopsWith(gopsToAlignWith);
        }
      };

      // feed incoming data to the front of the parsing pipeline
      this.push = function (data) {
        if (hasFlushed) {
          var isAac = isLikelyAacData$1(data);

          if (isAac && this.transmuxPipeline_.type !== 'aac') {
            this.setupAacPipeline();
          } else if (!isAac && this.transmuxPipeline_.type !== 'ts') {
            this.setupTsPipeline();
          }
          hasFlushed = false;
        }
        this.transmuxPipeline_.headOfPipeline.push(data);
      };

      // flush any buffered data
      this.flush = function () {
        hasFlushed = true;
        // Start at the top of the pipeline and flush all pending work
        this.transmuxPipeline_.headOfPipeline.flush();
      };

      this.endTimeline = function () {
        this.transmuxPipeline_.headOfPipeline.endTimeline();
      };

      this.reset = function () {
        if (this.transmuxPipeline_.headOfPipeline) {
          this.transmuxPipeline_.headOfPipeline.reset();
        }
      };

      // Caption data has to be reset when seeking outside buffered range
      this.resetCaptions = function () {
        if (this.transmuxPipeline_.captionStream) {
          this.transmuxPipeline_.captionStream.reset();
        }
      };
    };
    _Transmuxer.prototype = new stream();

    var transmuxer = {
      Transmuxer: _Transmuxer,
      VideoSegmentStream: _VideoSegmentStream,
      AudioSegmentStream: _AudioSegmentStream,
      AUDIO_PROPERTIES: AUDIO_PROPERTIES,
      VIDEO_PROPERTIES: VIDEO_PROPERTIES,
      // exported for testing
      generateVideoSegmentTimingInfo: generateVideoSegmentTimingInfo
    };

    var classCallCheck = function classCallCheck(instance, Constructor) {
      if (!(instance instanceof Constructor)) {
        throw new TypeError("Cannot call a class as a function");
      }
    };

    var createClass = function () {
      function defineProperties(target, props) {
        for (var i = 0; i < props.length; i++) {
          var descriptor = props[i];
          descriptor.enumerable = descriptor.enumerable || false;
          descriptor.configurable = true;
          if ("value" in descriptor) descriptor.writable = true;
          Object.defineProperty(target, descriptor.key, descriptor);
        }
      }

      return function (Constructor, protoProps, staticProps) {
        if (protoProps) defineProperties(Constructor.prototype, protoProps);
        if (staticProps) defineProperties(Constructor, staticProps);
        return Constructor;
      };
    }();

    /**
     * @file transmuxer-worker.js
     */

    /**
     * Re-emits transmuxer events by converting them into messages to the
     * world outside the worker.
     *
     * @param {Object} transmuxer the transmuxer to wire events on
     * @private
     */
    var wireTransmuxerEvents = function wireTransmuxerEvents(self, transmuxer$$1) {
      transmuxer$$1.on('data', function (segment) {
        // transfer ownership of the underlying ArrayBuffer
        // instead of doing a copy to save memory
        // ArrayBuffers are transferable but generic TypedArrays are not
        // @link https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers#Passing_data_by_transferring_ownership_(transferable_objects)
        var initArray = segment.initSegment;

        segment.initSegment = {
          data: initArray.buffer,
          byteOffset: initArray.byteOffset,
          byteLength: initArray.byteLength
        };

        var typedArray = segment.data;

        segment.data = typedArray.buffer;
        self.postMessage({
          action: 'data',
          segment: segment,
          byteOffset: typedArray.byteOffset,
          byteLength: typedArray.byteLength
        }, [segment.data]);
      });

      if (transmuxer$$1.captionStream) {
        transmuxer$$1.captionStream.on('data', function (caption) {
          self.postMessage({
            action: 'caption',
            data: caption
          });
        });
      }

      transmuxer$$1.on('done', function (data) {
        self.postMessage({ action: 'done' });
      });

      transmuxer$$1.on('gopInfo', function (gopInfo) {
        self.postMessage({
          action: 'gopInfo',
          gopInfo: gopInfo
        });
      });

      transmuxer$$1.on('videoSegmentTimingInfo', function (videoSegmentTimingInfo) {
        self.postMessage({
          action: 'videoSegmentTimingInfo',
          videoSegmentTimingInfo: videoSegmentTimingInfo
        });
      });
    };

    /**
     * All incoming messages route through this hash. If no function exists
     * to handle an incoming message, then we ignore the message.
     *
     * @class MessageHandlers
     * @param {Object} options the options to initialize with
     */

    var MessageHandlers = function () {
      function MessageHandlers(self, options) {
        classCallCheck(this, MessageHandlers);

        this.options = options || {};
        this.self = self;
        this.init();
      }

      /**
       * initialize our web worker and wire all the events.
       */

      createClass(MessageHandlers, [{
        key: 'init',
        value: function init() {
          if (this.transmuxer) {
            this.transmuxer.dispose();
          }
          this.transmuxer = new transmuxer.Transmuxer(this.options);
          wireTransmuxerEvents(this.self, this.transmuxer);
        }

        /**
         * Adds data (a ts segment) to the start of the transmuxer pipeline for
         * processing.
         *
         * @param {ArrayBuffer} data data to push into the muxer
         */

      }, {
        key: 'push',
        value: function push(data) {
          // Cast array buffer to correct type for transmuxer
          var segment = new Uint8Array(data.data, data.byteOffset, data.byteLength);

          this.transmuxer.push(segment);
        }

        /**
         * Recreate the transmuxer so that the next segment added via `push`
         * start with a fresh transmuxer.
         */

      }, {
        key: 'reset',
        value: function reset() {
          this.init();
        }

        /**
         * Set the value that will be used as the `baseMediaDecodeTime` time for the
         * next segment pushed in. Subsequent segments will have their `baseMediaDecodeTime`
         * set relative to the first based on the PTS values.
         *
         * @param {Object} data used to set the timestamp offset in the muxer
         */

      }, {
        key: 'setTimestampOffset',
        value: function setTimestampOffset(data) {
          var timestampOffset = data.timestampOffset || 0;

          this.transmuxer.setBaseMediaDecodeTime(Math.round(timestampOffset * 90000));
        }
      }, {
        key: 'setAudioAppendStart',
        value: function setAudioAppendStart(data) {
          this.transmuxer.setAudioAppendStart(Math.ceil(data.appendStart * 90000));
        }

        /**
         * Forces the pipeline to finish processing the last segment and emit it's
         * results.
         *
         * @param {Object} data event data, not really used
         */

      }, {
        key: 'flush',
        value: function flush(data) {
          this.transmuxer.flush();
        }
      }, {
        key: 'resetCaptions',
        value: function resetCaptions() {
          this.transmuxer.resetCaptions();
        }
      }, {
        key: 'alignGopsWith',
        value: function alignGopsWith(data) {
          this.transmuxer.alignGopsWith(data.gopsToAlignWith.slice());
        }
      }]);
      return MessageHandlers;
    }();

    /**
     * Our web wroker interface so that things can talk to mux.js
     * that will be running in a web worker. the scope is passed to this by
     * webworkify.
     *
     * @param {Object} self the scope for the web worker
     */

    var TransmuxerWorker = function TransmuxerWorker(self) {
      self.onmessage = function (event) {
        if (event.data.action === 'init' && event.data.options) {
          this.messageHandlers = new MessageHandlers(self, event.data.options);
          return;
        }

        if (!this.messageHandlers) {
          this.messageHandlers = new MessageHandlers(self);
        }

        if (event.data && event.data.action && event.data.action !== 'init') {
          if (this.messageHandlers[event.data.action]) {
            this.messageHandlers[event.data.action](event.data);
          }
        }
      };
    };

    var transmuxerWorker = new TransmuxerWorker(self);

    return transmuxerWorker;
  }();
});

/**
 * @file - codecs.js - Handles tasks regarding codec strings such as translating them to
 * codec strings, or translating codec strings into objects that can be examined.
 */

// Default codec parameters if none were provided for video and/or audio
var defaultCodecs = {
  videoCodec: 'avc1',
  videoObjectTypeIndicator: '.4d400d',
  // AAC-LC
  audioProfile: '2'
};

/**
 * Replace the old apple-style `avc1.<dd>.<dd>` codec string with the standard
 * `avc1.<hhhhhh>`
 *
 * @param {Array} codecs an array of codec strings to fix
 * @return {Array} the translated codec array
 * @private
 */
var translateLegacyCodecs = function translateLegacyCodecs(codecs) {
  return codecs.map(function (codec) {
    return codec.replace(/avc1\.(\d+)\.(\d+)/i, function (orig, profile, avcLevel) {
      var profileHex = ('00' + Number(profile).toString(16)).slice(-2);
      var avcLevelHex = ('00' + Number(avcLevel).toString(16)).slice(-2);

      return 'avc1.' + profileHex + '00' + avcLevelHex;
    });
  });
};

/**
 * Parses a codec string to retrieve the number of codecs specified,
 * the video codec and object type indicator, and the audio profile.
 */

var parseCodecs = function parseCodecs() {
  var codecs = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';

  var result = {
    codecCount: 0
  };
  var parsed = void 0;

  result.codecCount = codecs.split(',').length;
  result.codecCount = result.codecCount || 2;

  // parse the video codec
  parsed = /(^|\s|,)+(avc[13])([^ ,]*)/i.exec(codecs);
  if (parsed) {
    result.videoCodec = parsed[2];
    result.videoObjectTypeIndicator = parsed[3];
  }

  // parse the last field of the audio codec
  result.audioProfile = /(^|\s|,)+mp4a.[0-9A-Fa-f]+\.([0-9A-Fa-f]+)/i.exec(codecs);
  result.audioProfile = result.audioProfile && result.audioProfile[2];

  return result;
};

/**
 * Replace codecs in the codec string with the old apple-style `avc1.<dd>.<dd>` to the
 * standard `avc1.<hhhhhh>`.
 *
 * @param codecString {String} the codec string
 * @return {String} the codec string with old apple-style codecs replaced
 *
 * @private
 */
var mapLegacyAvcCodecs = function mapLegacyAvcCodecs(codecString) {
  return codecString.replace(/avc1\.(\d+)\.(\d+)/i, function (match) {
    return translateLegacyCodecs([match])[0];
  });
};

/**
 * Build a media mime-type string from a set of parameters
 * @param {String} type either 'audio' or 'video'
 * @param {String} container either 'mp2t' or 'mp4'
 * @param {Array} codecs an array of codec strings to add
 * @return {String} a valid media mime-type
 */
var makeMimeTypeString = function makeMimeTypeString(type, container, codecs) {
  // The codecs array is filtered so that falsey values are
  // dropped and don't cause Array#join to create spurious
  // commas
  return type + '/' + container + '; codecs="' + codecs.filter(function (c) {
    return !!c;
  }).join(', ') + '"';
};

/**
 * Returns the type container based on information in the playlist
 * @param {Playlist} media the current media playlist
 * @return {String} a valid media container type
 */
var getContainerType = function getContainerType(media) {
  // An initialization segment means the media playlist is an iframe
  // playlist or is using the mp4 container. We don't currently
  // support iframe playlists, so assume this is signalling mp4
  // fragments.
  if (media.segments && media.segments.length && media.segments[0].map) {
    return 'mp4';
  }
  return 'mp2t';
};

/**
 * Returns a set of codec strings parsed from the playlist or the default
 * codec strings if no codecs were specified in the playlist
 * @param {Playlist} media the current media playlist
 * @return {Object} an object with the video and audio codecs
 */
var getCodecs = function getCodecs(media) {
  // if the codecs were explicitly specified, use them instead of the
  // defaults
  var mediaAttributes = media.attributes || {};

  if (mediaAttributes.CODECS) {
    return parseCodecs(mediaAttributes.CODECS);
  }
  return defaultCodecs;
};

var audioProfileFromDefault = function audioProfileFromDefault(master, audioGroupId) {
  if (!master.mediaGroups.AUDIO || !audioGroupId) {
    return null;
  }

  var audioGroup = master.mediaGroups.AUDIO[audioGroupId];

  if (!audioGroup) {
    return null;
  }

  for (var name in audioGroup) {
    var audioType = audioGroup[name];

    if (audioType.default && audioType.playlists) {
      // codec should be the same for all playlists within the audio type
      return parseCodecs(audioType.playlists[0].attributes.CODECS).audioProfile;
    }
  }

  return null;
};

/**
 * Calculates the MIME type strings for a working configuration of
 * SourceBuffers to play variant streams in a master playlist. If
 * there is no possible working configuration, an empty array will be
 * returned.
 *
 * @param master {Object} the m3u8 object for the master playlist
 * @param media {Object} the m3u8 object for the variant playlist
 * @return {Array} the MIME type strings. If the array has more than
 * one entry, the first element should be applied to the video
 * SourceBuffer and the second to the audio SourceBuffer.
 *
 * @private
 */
var mimeTypesForPlaylist = function mimeTypesForPlaylist(master, media) {
  var containerType = getContainerType(media);
  var codecInfo = getCodecs(media);
  var mediaAttributes = media.attributes || {};
  // Default condition for a traditional HLS (no demuxed audio/video)
  var isMuxed = true;
  var isMaat = false;

  if (!media) {
    // Not enough information
    return [];
  }

  if (master.mediaGroups.AUDIO && mediaAttributes.AUDIO) {
    var audioGroup = master.mediaGroups.AUDIO[mediaAttributes.AUDIO];

    // Handle the case where we are in a multiple-audio track scenario
    if (audioGroup) {
      isMaat = true;
      // Start with the everything demuxed then...
      isMuxed = false;
      // ...check to see if any audio group tracks are muxed (ie. lacking a uri)
      for (var groupId in audioGroup) {
        // either a uri is present (if the case of HLS and an external playlist), or
        // playlists is present (in the case of DASH where we don't have external audio
        // playlists)
        if (!audioGroup[groupId].uri && !audioGroup[groupId].playlists) {
          isMuxed = true;
          break;
        }
      }
    }
  }

  // HLS with multiple-audio tracks must always get an audio codec.
  // Put another way, there is no way to have a video-only multiple-audio HLS!
  if (isMaat && !codecInfo.audioProfile) {
    if (!isMuxed) {
      // It is possible for codecs to be specified on the audio media group playlist but
      // not on the rendition playlist. This is mostly the case for DASH, where audio and
      // video are always separate (and separately specified).
      codecInfo.audioProfile = audioProfileFromDefault(master, mediaAttributes.AUDIO);
    }

    if (!codecInfo.audioProfile) {
      videojs.log.warn('Multiple audio tracks present but no audio codec string is specified. ' + 'Attempting to use the default audio codec (mp4a.40.2)');
      codecInfo.audioProfile = defaultCodecs.audioProfile;
    }
  }

  // Generate the final codec strings from the codec object generated above
  var codecStrings = {};

  if (codecInfo.videoCodec) {
    codecStrings.video = '' + codecInfo.videoCodec + codecInfo.videoObjectTypeIndicator;
  }

  if (codecInfo.audioProfile) {
    codecStrings.audio = 'mp4a.40.' + codecInfo.audioProfile;
  }

  // Finally, make and return an array with proper mime-types depending on
  // the configuration
  var justAudio = makeMimeTypeString('audio', containerType, [codecStrings.audio]);
  var justVideo = makeMimeTypeString('video', containerType, [codecStrings.video]);
  var bothVideoAudio = makeMimeTypeString('video', containerType, [codecStrings.video, codecStrings.audio]);

  if (isMaat) {
    if (!isMuxed && codecStrings.video) {
      return [justVideo, justAudio];
    }

    if (!isMuxed && !codecStrings.video) {
      // There is no muxed content and no video codec string, so this is an audio only
      // stream with alternate audio.
      return [justAudio, justAudio];
    }

    // There exists the possiblity that this will return a `video/container`
    // mime-type for the first entry in the array even when there is only audio.
    // This doesn't appear to be a problem and simplifies the code.
    return [bothVideoAudio, justAudio];
  }

  // If there is no video codec at all, always just return a single
  // audio/<container> mime-type
  if (!codecStrings.video) {
    return [justAudio];
  }

  // When not using separate audio media groups, audio and video is
  // *always* muxed
  return [bothVideoAudio];
};

/**
 * Parse a content type header into a type and parameters
 * object
 *
 * @param {String} type the content type header
 * @return {Object} the parsed content-type
 * @private
 */
var parseContentType = function parseContentType(type) {
  var object = { type: '', parameters: {} };
  var parameters = type.trim().split(';');

  // first parameter should always be content-type
  object.type = parameters.shift().trim();
  parameters.forEach(function (parameter) {
    var pair = parameter.trim().split('=');

    if (pair.length > 1) {
      var name = pair[0].replace(/"/g, '').trim();
      var value = pair[1].replace(/"/g, '').trim();

      object.parameters[name] = value;
    }
  });

  return object;
};

/**
 * Check if a codec string refers to an audio codec.
 *
 * @param {String} codec codec string to check
 * @return {Boolean} if this is an audio codec
 * @private
 */
var isAudioCodec = function isAudioCodec(codec) {
  return (/mp4a\.\d+.\d+/i.test(codec)
  );
};

/**
 * Check if a codec string refers to a video codec.
 *
 * @param {String} codec codec string to check
 * @return {Boolean} if this is a video codec
 * @private
 */
var isVideoCodec = function isVideoCodec(codec) {
  return (/avc1\.[\da-f]+/i.test(codec)
  );
};

/**
 * Returns a list of gops in the buffer that have a pts value of 3 seconds or more in
 * front of current time.
 *
 * @param {Array} buffer
 *        The current buffer of gop information
 * @param {Number} currentTime
 *        The current time
 * @param {Double} mapping
 *        Offset to map display time to stream presentation time
 * @return {Array}
 *         List of gops considered safe to append over
 */
var gopsSafeToAlignWith = function gopsSafeToAlignWith(buffer, currentTime, mapping) {
  if (typeof currentTime === 'undefined' || currentTime === null || !buffer.length) {
    return [];
  }

  // pts value for current time + 3 seconds to give a bit more wiggle room
  var currentTimePts = Math.ceil((currentTime - mapping + 3) * 90000);

  var i = void 0;

  for (i = 0; i < buffer.length; i++) {
    if (buffer[i].pts > currentTimePts) {
      break;
    }
  }

  return buffer.slice(i);
};

/**
 * Appends gop information (timing and byteLength) received by the transmuxer for the
 * gops appended in the last call to appendBuffer
 *
 * @param {Array} buffer
 *        The current buffer of gop information
 * @param {Array} gops
 *        List of new gop information
 * @param {boolean} replace
 *        If true, replace the buffer with the new gop information. If false, append the
 *        new gop information to the buffer in the right location of time.
 * @return {Array}
 *         Updated list of gop information
 */
var updateGopBuffer = function updateGopBuffer(buffer, gops, replace) {
  if (!gops.length) {
    return buffer;
  }

  if (replace) {
    // If we are in safe append mode, then completely overwrite the gop buffer
    // with the most recent appeneded data. This will make sure that when appending
    // future segments, we only try to align with gops that are both ahead of current
    // time and in the last segment appended.
    return gops.slice();
  }

  var start = gops[0].pts;

  var i = 0;

  for (i; i < buffer.length; i++) {
    if (buffer[i].pts >= start) {
      break;
    }
  }

  return buffer.slice(0, i).concat(gops);
};

/**
 * Removes gop information in buffer that overlaps with provided start and end
 *
 * @param {Array} buffer
 *        The current buffer of gop information
 * @param {Double} start
 *        position to start the remove at
 * @param {Double} end
 *        position to end the remove at
 * @param {Double} mapping
 *        Offset to map display time to stream presentation time
 */
var removeGopBuffer = function removeGopBuffer(buffer, start, end, mapping) {
  var startPts = Math.ceil((start - mapping) * 90000);
  var endPts = Math.ceil((end - mapping) * 90000);
  var updatedBuffer = buffer.slice();

  var i = buffer.length;

  while (i--) {
    if (buffer[i].pts <= endPts) {
      break;
    }
  }

  if (i === -1) {
    // no removal because end of remove range is before start of buffer
    return updatedBuffer;
  }

  var j = i + 1;

  while (j--) {
    if (buffer[j].pts <= startPts) {
      break;
    }
  }

  // clamp remove range start to 0 index
  j = Math.max(j, 0);

  updatedBuffer.splice(j, i - j + 1);

  return updatedBuffer;
};

var buffered = function buffered(videoBuffer, audioBuffer, audioDisabled) {
  var start = null;
  var end = null;
  var arity = 0;
  var extents = [];
  var ranges = [];

  // neither buffer has been created yet
  if (!videoBuffer && !audioBuffer) {
    return videojs.createTimeRange();
  }

  // only one buffer is configured
  if (!videoBuffer) {
    return audioBuffer.buffered;
  }
  if (!audioBuffer) {
    return videoBuffer.buffered;
  }

  // both buffers are configured
  if (audioDisabled) {
    return videoBuffer.buffered;
  }

  // both buffers are empty
  if (videoBuffer.buffered.length === 0 && audioBuffer.buffered.length === 0) {
    return videojs.createTimeRange();
  }

  // Handle the case where we have both buffers and create an
  // intersection of the two
  var videoBuffered = videoBuffer.buffered;
  var audioBuffered = audioBuffer.buffered;
  var count = videoBuffered.length;

  // A) Gather up all start and end times
  while (count--) {
    extents.push({ time: videoBuffered.start(count), type: 'start' });
    extents.push({ time: videoBuffered.end(count), type: 'end' });
  }
  count = audioBuffered.length;
  while (count--) {
    extents.push({ time: audioBuffered.start(count), type: 'start' });
    extents.push({ time: audioBuffered.end(count), type: 'end' });
  }
  // B) Sort them by time
  extents.sort(function (a, b) {
    return a.time - b.time;
  });

  // C) Go along one by one incrementing arity for start and decrementing
  //    arity for ends
  for (count = 0; count < extents.length; count++) {
    if (extents[count].type === 'start') {
      arity++;

      // D) If arity is ever incremented to 2 we are entering an
      //    overlapping range
      if (arity === 2) {
        start = extents[count].time;
      }
    } else if (extents[count].type === 'end') {
      arity--;

      // E) If arity is ever decremented to 1 we leaving an
      //    overlapping range
      if (arity === 1) {
        end = extents[count].time;
      }
    }

    // F) Record overlapping ranges
    if (start !== null && end !== null) {
      ranges.push([start, end]);
      start = null;
      end = null;
    }
  }

  return videojs.createTimeRanges(ranges);
};

/**
 * @file virtual-source-buffer.js
 */

var ONE_SECOND_IN_TS = 90000;

// We create a wrapper around the SourceBuffer so that we can manage the
// state of the `updating` property manually. We have to do this because
// Firefox changes `updating` to false long before triggering `updateend`
// events and that was causing strange problems in videojs-contrib-hls
var makeWrappedSourceBuffer = function makeWrappedSourceBuffer(mediaSource, mimeType) {
  var sourceBuffer = mediaSource.addSourceBuffer(mimeType);
  var wrapper = Object.create(null);

  wrapper.updating = false;
  wrapper.realBuffer_ = sourceBuffer;

  var _loop = function _loop(key) {
    if (typeof sourceBuffer[key] === 'function') {
      wrapper[key] = function () {
        return sourceBuffer[key].apply(sourceBuffer, arguments);
      };
    } else if (typeof wrapper[key] === 'undefined') {
      Object.defineProperty(wrapper, key, {
        get: function get$$1() {
          return sourceBuffer[key];
        },
        set: function set$$1(v) {
          return sourceBuffer[key] = v;
        }
      });
    }
  };

  for (var key in sourceBuffer) {
    _loop(key);
  }

  return wrapper;
};

/**
 * VirtualSourceBuffers exist so that we can transmux non native formats
 * into a native format, but keep the same api as a native source buffer.
 * It creates a transmuxer, that works in its own thread (a web worker) and
 * that transmuxer muxes the data into a native format. VirtualSourceBuffer will
 * then send all of that data to the naive sourcebuffer so that it is
 * indestinguishable from a natively supported format.
 *
 * @param {HtmlMediaSource} mediaSource the parent mediaSource
 * @param {Array} codecs array of codecs that we will be dealing with
 * @class VirtualSourceBuffer
 * @extends video.js.EventTarget
 */

var VirtualSourceBuffer = function (_videojs$EventTarget) {
  inherits(VirtualSourceBuffer, _videojs$EventTarget);

  function VirtualSourceBuffer(mediaSource, codecs) {
    classCallCheck(this, VirtualSourceBuffer);

    var _this = possibleConstructorReturn(this, (VirtualSourceBuffer.__proto__ || Object.getPrototypeOf(VirtualSourceBuffer)).call(this, videojs.EventTarget));

    _this.timestampOffset_ = 0;
    _this.pendingBuffers_ = [];
    _this.bufferUpdating_ = false;

    _this.mediaSource_ = mediaSource;
    _this.codecs_ = codecs;
    _this.audioCodec_ = null;
    _this.videoCodec_ = null;
    _this.audioDisabled_ = false;
    _this.appendAudioInitSegment_ = true;
    _this.gopBuffer_ = [];
    _this.timeMapping_ = 0;
    _this.safeAppend_ = videojs.browser.IE_VERSION >= 11;

    var options = {
      remux: false,
      alignGopsAtEnd: _this.safeAppend_
    };

    _this.codecs_.forEach(function (codec) {
      if (isAudioCodec(codec)) {
        _this.audioCodec_ = codec;
      } else if (isVideoCodec(codec)) {
        _this.videoCodec_ = codec;
      }
    });

    // append muxed segments to their respective native buffers as
    // soon as they are available
    _this.transmuxer_ = new TransmuxWorker();
    _this.transmuxer_.postMessage({ action: 'init', options: options });

    _this.transmuxer_.onmessage = function (event) {
      if (event.data.action === 'data') {
        return _this.data_(event);
      }

      if (event.data.action === 'done') {
        return _this.done_(event);
      }

      if (event.data.action === 'gopInfo') {
        return _this.appendGopInfo_(event);
      }

      if (event.data.action === 'videoSegmentTimingInfo') {
        return _this.videoSegmentTimingInfo_(event.data.videoSegmentTimingInfo);
      }
    };

    // this timestampOffset is a property with the side-effect of resetting
    // baseMediaDecodeTime in the transmuxer on the setter
    Object.defineProperty(_this, 'timestampOffset', {
      get: function get$$1() {
        return this.timestampOffset_;
      },
      set: function set$$1(val) {
        if (typeof val === 'number' && val >= 0) {
          this.timestampOffset_ = val;
          this.appendAudioInitSegment_ = true;

          // reset gop buffer on timestampoffset as this signals a change in timeline
          this.gopBuffer_.length = 0;
          this.timeMapping_ = 0;

          // We have to tell the transmuxer to set the baseMediaDecodeTime to
          // the desired timestampOffset for the next segment
          this.transmuxer_.postMessage({
            action: 'setTimestampOffset',
            timestampOffset: val
          });
        }
      }
    });

    // setting the append window affects both source buffers
    Object.defineProperty(_this, 'appendWindowStart', {
      get: function get$$1() {
        return (this.videoBuffer_ || this.audioBuffer_).appendWindowStart;
      },
      set: function set$$1(start) {
        if (this.videoBuffer_) {
          this.videoBuffer_.appendWindowStart = start;
        }
        if (this.audioBuffer_) {
          this.audioBuffer_.appendWindowStart = start;
        }
      }
    });

    // this buffer is "updating" if either of its native buffers are
    Object.defineProperty(_this, 'updating', {
      get: function get$$1() {
        return !!(this.bufferUpdating_ || !this.audioDisabled_ && this.audioBuffer_ && this.audioBuffer_.updating || this.videoBuffer_ && this.videoBuffer_.updating);
      }
    });

    // the buffered property is the intersection of the buffered
    // ranges of the native source buffers
    Object.defineProperty(_this, 'buffered', {
      get: function get$$1() {
        return buffered(this.videoBuffer_, this.audioBuffer_, this.audioDisabled_);
      }
    });
    return _this;
  }

  /**
   * When we get a data event from the transmuxer
   * we call this function and handle the data that
   * was sent to us
   *
   * @private
   * @param {Event} event the data event from the transmuxer
   */


  createClass(VirtualSourceBuffer, [{
    key: 'data_',
    value: function data_(event) {
      var segment = event.data.segment;

      // Cast ArrayBuffer to TypedArray
      segment.data = new Uint8Array(segment.data, event.data.byteOffset, event.data.byteLength);

      segment.initSegment = new Uint8Array(segment.initSegment.data, segment.initSegment.byteOffset, segment.initSegment.byteLength);

      createTextTracksIfNecessary(this, this.mediaSource_, segment);

      // Add the segments to the pendingBuffers array
      this.pendingBuffers_.push(segment);
      return;
    }

    /**
     * When we get a done event from the transmuxer
     * we call this function and we process all
     * of the pending data that we have been saving in the
     * data_ function
     *
     * @private
     * @param {Event} event the done event from the transmuxer
     */

  }, {
    key: 'done_',
    value: function done_(event) {
      // Don't process and append data if the mediaSource is closed
      if (this.mediaSource_.readyState === 'closed') {
        this.pendingBuffers_.length = 0;
        return;
      }

      // All buffers should have been flushed from the muxer
      // start processing anything we have received
      this.processPendingSegments_();
      return;
    }
  }, {
    key: 'videoSegmentTimingInfo_',
    value: function videoSegmentTimingInfo_(timingInfo) {
      var timingInfoInSeconds = {
        start: {
          decode: timingInfo.start.dts / ONE_SECOND_IN_TS,
          presentation: timingInfo.start.pts / ONE_SECOND_IN_TS
        },
        end: {
          decode: timingInfo.end.dts / ONE_SECOND_IN_TS,
          presentation: timingInfo.end.pts / ONE_SECOND_IN_TS
        },
        baseMediaDecodeTime: timingInfo.baseMediaDecodeTime / ONE_SECOND_IN_TS
      };

      if (timingInfo.prependedContentDuration) {
        timingInfoInSeconds.prependedContentDuration = timingInfo.prependedContentDuration / ONE_SECOND_IN_TS;
      }

      this.trigger({
        type: 'videoSegmentTimingInfo',
        videoSegmentTimingInfo: timingInfoInSeconds
      });
    }

    /**
     * Create our internal native audio/video source buffers and add
     * event handlers to them with the following conditions:
     * 1. they do not already exist on the mediaSource
     * 2. this VSB has a codec for them
     *
     * @private
     */

  }, {
    key: 'createRealSourceBuffers_',
    value: function createRealSourceBuffers_() {
      var _this2 = this;

      var types = ['audio', 'video'];

      types.forEach(function (type) {
        // Don't create a SourceBuffer of this type if we don't have a
        // codec for it
        if (!_this2[type + 'Codec_']) {
          return;
        }

        // Do nothing if a SourceBuffer of this type already exists
        if (_this2[type + 'Buffer_']) {
          return;
        }

        var buffer = null;

        // If the mediasource already has a SourceBuffer for the codec
        // use that
        if (_this2.mediaSource_[type + 'Buffer_']) {
          buffer = _this2.mediaSource_[type + 'Buffer_'];
          // In multiple audio track cases, the audio source buffer is disabled
          // on the main VirtualSourceBuffer by the HTMLMediaSource much earlier
          // than createRealSourceBuffers_ is called to create the second
          // VirtualSourceBuffer because that happens as a side-effect of
          // videojs-contrib-hls starting the audioSegmentLoader. As a result,
          // the audioBuffer is essentially "ownerless" and no one will toggle
          // the `updating` state back to false once the `updateend` event is received
          //
          // Setting `updating` to false manually will work around this
          // situation and allow work to continue
          buffer.updating = false;
        } else {
          var codecProperty = type + 'Codec_';
          var mimeType = type + '/mp4;codecs="' + _this2[codecProperty] + '"';

          buffer = makeWrappedSourceBuffer(_this2.mediaSource_.nativeMediaSource_, mimeType);

          _this2.mediaSource_[type + 'Buffer_'] = buffer;
        }

        _this2[type + 'Buffer_'] = buffer;

        // Wire up the events to the SourceBuffer
        ['update', 'updatestart', 'updateend'].forEach(function (event) {
          buffer.addEventListener(event, function () {
            // if audio is disabled
            if (type === 'audio' && _this2.audioDisabled_) {
              return;
            }

            if (event === 'updateend') {
              _this2[type + 'Buffer_'].updating = false;
            }

            var shouldTrigger = types.every(function (t) {
              // skip checking audio's updating status if audio
              // is not enabled
              if (t === 'audio' && _this2.audioDisabled_) {
                return true;
              }
              // if the other type is updating we don't trigger
              if (type !== t && _this2[t + 'Buffer_'] && _this2[t + 'Buffer_'].updating) {
                return false;
              }
              return true;
            });

            if (shouldTrigger) {
              return _this2.trigger(event);
            }
          });
        });
      });
    }

    /**
     * Emulate the native mediasource function, but our function will
     * send all of the proposed segments to the transmuxer so that we
     * can transmux them before we append them to our internal
     * native source buffers in the correct format.
     *
     * @link https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer/appendBuffer
     * @param {Uint8Array} segment the segment to append to the buffer
     */

  }, {
    key: 'appendBuffer',
    value: function appendBuffer(segment) {
      // Start the internal "updating" state
      this.bufferUpdating_ = true;

      if (this.audioBuffer_ && this.audioBuffer_.buffered.length) {
        var audioBuffered = this.audioBuffer_.buffered;

        this.transmuxer_.postMessage({
          action: 'setAudioAppendStart',
          appendStart: audioBuffered.end(audioBuffered.length - 1)
        });
      }

      if (this.videoBuffer_) {
        this.transmuxer_.postMessage({
          action: 'alignGopsWith',
          gopsToAlignWith: gopsSafeToAlignWith(this.gopBuffer_, this.mediaSource_.player_ ? this.mediaSource_.player_.currentTime() : null, this.timeMapping_)
        });
      }

      this.transmuxer_.postMessage({
        action: 'push',
        // Send the typed-array of data as an ArrayBuffer so that
        // it can be sent as a "Transferable" and avoid the costly
        // memory copy
        data: segment.buffer,

        // To recreate the original typed-array, we need information
        // about what portion of the ArrayBuffer it was a view into
        byteOffset: segment.byteOffset,
        byteLength: segment.byteLength
      }, [segment.buffer]);
      this.transmuxer_.postMessage({ action: 'flush' });
    }

    /**
     * Appends gop information (timing and byteLength) received by the transmuxer for the
     * gops appended in the last call to appendBuffer
     *
     * @param {Event} event
     *        The gopInfo event from the transmuxer
     * @param {Array} event.data.gopInfo
     *        List of gop info to append
     */

  }, {
    key: 'appendGopInfo_',
    value: function appendGopInfo_(event) {
      this.gopBuffer_ = updateGopBuffer(this.gopBuffer_, event.data.gopInfo, this.safeAppend_);
    }

    /**
     * Emulate the native mediasource function and remove parts
     * of the buffer from any of our internal buffers that exist
     *
     * @link https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer/remove
     * @param {Double} start position to start the remove at
     * @param {Double} end position to end the remove at
     */

  }, {
    key: 'remove',
    value: function remove(start, end) {
      if (this.videoBuffer_) {
        this.videoBuffer_.updating = true;
        this.videoBuffer_.remove(start, end);
        this.gopBuffer_ = removeGopBuffer(this.gopBuffer_, start, end, this.timeMapping_);
      }
      if (!this.audioDisabled_ && this.audioBuffer_) {
        this.audioBuffer_.updating = true;
        this.audioBuffer_.remove(start, end);
      }

      // Remove Metadata Cues (id3)
      removeCuesFromTrack(start, end, this.metadataTrack_);

      // Remove Any Captions
      if (this.inbandTextTracks_) {
        for (var track in this.inbandTextTracks_) {
          removeCuesFromTrack(start, end, this.inbandTextTracks_[track]);
        }
      }
    }

    /**
     * Process any segments that the muxer has output
     * Concatenate segments together based on type and append them into
     * their respective sourceBuffers
     *
     * @private
     */

  }, {
    key: 'processPendingSegments_',
    value: function processPendingSegments_() {
      var sortedSegments = {
        video: {
          segments: [],
          bytes: 0
        },
        audio: {
          segments: [],
          bytes: 0
        },
        captions: [],
        metadata: []
      };

      if (!this.pendingBuffers_.length) {
        // We are no longer in the internal "updating" state
        this.trigger('updateend');
        this.bufferUpdating_ = false;
        return;
      }

      // Sort segments into separate video/audio arrays and
      // keep track of their total byte lengths
      sortedSegments = this.pendingBuffers_.reduce(function (segmentObj, segment) {
        var type = segment.type;
        var data = segment.data;
        var initSegment = segment.initSegment;

        segmentObj[type].segments.push(data);
        segmentObj[type].bytes += data.byteLength;

        segmentObj[type].initSegment = initSegment;

        // Gather any captions into a single array
        if (segment.captions) {
          segmentObj.captions = segmentObj.captions.concat(segment.captions);
        }

        if (segment.info) {
          segmentObj[type].info = segment.info;
        }

        // Gather any metadata into a single array
        if (segment.metadata) {
          segmentObj.metadata = segmentObj.metadata.concat(segment.metadata);
        }

        return segmentObj;
      }, sortedSegments);

      // Create the real source buffers if they don't exist by now since we
      // finally are sure what tracks are contained in the source
      if (!this.videoBuffer_ && !this.audioBuffer_) {
        // Remove any codecs that may have been specified by default but
        // are no longer applicable now
        if (sortedSegments.video.bytes === 0) {
          this.videoCodec_ = null;
        }
        if (sortedSegments.audio.bytes === 0) {
          this.audioCodec_ = null;
        }

        this.createRealSourceBuffers_();
      }

      if (sortedSegments.audio.info) {
        this.mediaSource_.trigger({ type: 'audioinfo', info: sortedSegments.audio.info });
      }
      if (sortedSegments.video.info) {
        this.mediaSource_.trigger({ type: 'videoinfo', info: sortedSegments.video.info });
      }

      if (this.appendAudioInitSegment_) {
        if (!this.audioDisabled_ && this.audioBuffer_) {
          sortedSegments.audio.segments.unshift(sortedSegments.audio.initSegment);
          sortedSegments.audio.bytes += sortedSegments.audio.initSegment.byteLength;
        }
        this.appendAudioInitSegment_ = false;
      }

      var triggerUpdateend = false;

      // Merge multiple video and audio segments into one and append
      if (this.videoBuffer_ && sortedSegments.video.bytes) {
        sortedSegments.video.segments.unshift(sortedSegments.video.initSegment);
        sortedSegments.video.bytes += sortedSegments.video.initSegment.byteLength;
        this.concatAndAppendSegments_(sortedSegments.video, this.videoBuffer_);
      } else if (this.videoBuffer_ && (this.audioDisabled_ || !this.audioBuffer_)) {
        // The transmuxer did not return any bytes of video, meaning it was all trimmed
        // for gop alignment. Since we have a video buffer and audio is disabled, updateend
        // will never be triggered by this source buffer, which will cause contrib-hls
        // to be stuck forever waiting for updateend. If audio is not disabled, updateend
        // will be triggered by the audio buffer, which will be sent upwards since the video
        // buffer will not be in an updating state.
        triggerUpdateend = true;
      }

      // Add text-track data for all
      addTextTrackData(this, sortedSegments.captions, sortedSegments.metadata);

      if (!this.audioDisabled_ && this.audioBuffer_) {
        this.concatAndAppendSegments_(sortedSegments.audio, this.audioBuffer_);
      }

      this.pendingBuffers_.length = 0;

      if (triggerUpdateend) {
        this.trigger('updateend');
      }

      // We are no longer in the internal "updating" state
      this.bufferUpdating_ = false;
    }

    /**
     * Combine all segments into a single Uint8Array and then append them
     * to the destination buffer
     *
     * @param {Object} segmentObj
     * @param {SourceBuffer} destinationBuffer native source buffer to append data to
     * @private
     */

  }, {
    key: 'concatAndAppendSegments_',
    value: function concatAndAppendSegments_(segmentObj, destinationBuffer) {
      var offset = 0;
      var tempBuffer = void 0;

      if (segmentObj.bytes) {
        tempBuffer = new Uint8Array(segmentObj.bytes);

        // Combine the individual segments into one large typed-array
        segmentObj.segments.forEach(function (segment) {
          tempBuffer.set(segment, offset);
          offset += segment.byteLength;
        });

        try {
          destinationBuffer.updating = true;
          destinationBuffer.appendBuffer(tempBuffer);
        } catch (error) {
          if (this.mediaSource_.player_) {
            this.mediaSource_.player_.error({
              code: -3,
              type: 'APPEND_BUFFER_ERR',
              message: error.message,
              originalError: error
            });
          }
        }
      }
    }

    /**
     * Emulate the native mediasource function. abort any soureBuffer
     * actions and throw out any un-appended data.
     *
     * @link https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer/abort
     */

  }, {
    key: 'abort',
    value: function abort() {
      if (this.videoBuffer_) {
        this.videoBuffer_.abort();
      }
      if (!this.audioDisabled_ && this.audioBuffer_) {
        this.audioBuffer_.abort();
      }
      if (this.transmuxer_) {
        this.transmuxer_.postMessage({ action: 'reset' });
      }
      this.pendingBuffers_.length = 0;
      this.bufferUpdating_ = false;
    }
  }]);
  return VirtualSourceBuffer;
}(videojs.EventTarget);

/**
 * @file html-media-source.js
 */

/**
 * Our MediaSource implementation in HTML, mimics native
 * MediaSource where/if possible.
 *
 * @link https://developer.mozilla.org/en-US/docs/Web/API/MediaSource
 * @class HtmlMediaSource
 * @extends videojs.EventTarget
 */

var HtmlMediaSource = function (_videojs$EventTarget) {
  inherits(HtmlMediaSource, _videojs$EventTarget);

  function HtmlMediaSource() {
    classCallCheck(this, HtmlMediaSource);

    var _this = possibleConstructorReturn(this, (HtmlMediaSource.__proto__ || Object.getPrototypeOf(HtmlMediaSource)).call(this));

    var property = void 0;

    _this.nativeMediaSource_ = new window$1.MediaSource();
    // delegate to the native MediaSource's methods by default
    for (property in _this.nativeMediaSource_) {
      if (!(property in HtmlMediaSource.prototype) && typeof _this.nativeMediaSource_[property] === 'function') {
        _this[property] = _this.nativeMediaSource_[property].bind(_this.nativeMediaSource_);
      }
    }

    // emulate `duration` and `seekable` until seeking can be
    // handled uniformly for live streams
    // see https://github.com/w3c/media-source/issues/5
    _this.duration_ = NaN;
    Object.defineProperty(_this, 'duration', {
      get: function get$$1() {
        if (this.duration_ === Infinity) {
          return this.duration_;
        }
        return this.nativeMediaSource_.duration;
      },
      set: function set$$1(duration) {
        this.duration_ = duration;
        if (duration !== Infinity) {
          this.nativeMediaSource_.duration = duration;
          return;
        }
      }
    });
    Object.defineProperty(_this, 'seekable', {
      get: function get$$1() {
        if (this.duration_ === Infinity) {
          return videojs.createTimeRanges([[0, this.nativeMediaSource_.duration]]);
        }
        return this.nativeMediaSource_.seekable;
      }
    });

    Object.defineProperty(_this, 'readyState', {
      get: function get$$1() {
        return this.nativeMediaSource_.readyState;
      }
    });

    Object.defineProperty(_this, 'activeSourceBuffers', {
      get: function get$$1() {
        return this.activeSourceBuffers_;
      }
    });

    // the list of virtual and native SourceBuffers created by this
    // MediaSource
    _this.sourceBuffers = [];

    _this.activeSourceBuffers_ = [];

    /**
     * update the list of active source buffers based upon various
     * imformation from HLS and video.js
     *
     * @private
     */
    _this.updateActiveSourceBuffers_ = function () {
      // Retain the reference but empty the array
      _this.activeSourceBuffers_.length = 0;

      // If there is only one source buffer, then it will always be active and audio will
      // be disabled based on the codec of the source buffer
      if (_this.sourceBuffers.length === 1) {
        var sourceBuffer = _this.sourceBuffers[0];

        sourceBuffer.appendAudioInitSegment_ = true;
        sourceBuffer.audioDisabled_ = !sourceBuffer.audioCodec_;
        _this.activeSourceBuffers_.push(sourceBuffer);
        return;
      }

      // There are 2 source buffers, a combined (possibly video only) source buffer and
      // and an audio only source buffer.
      // By default, the audio in the combined virtual source buffer is enabled
      // and the audio-only source buffer (if it exists) is disabled.
      var disableCombined = false;
      var disableAudioOnly = true;

      // TODO: maybe we can store the sourcebuffers on the track objects?
      // safari may do something like this
      for (var i = 0; i < _this.player_.audioTracks().length; i++) {
        var track = _this.player_.audioTracks()[i];

        if (track.enabled && track.kind !== 'main') {
          // The enabled track is an alternate audio track so disable the audio in
          // the combined source buffer and enable the audio-only source buffer.
          disableCombined = true;
          disableAudioOnly = false;
          break;
        }
      }

      _this.sourceBuffers.forEach(function (sourceBuffer, index) {
        /* eslinst-disable */
        // TODO once codecs are required, we can switch to using the codecs to determine
        //      what stream is the video stream, rather than relying on videoTracks
        /* eslinst-enable */

        sourceBuffer.appendAudioInitSegment_ = true;

        if (sourceBuffer.videoCodec_ && sourceBuffer.audioCodec_) {
          // combined
          sourceBuffer.audioDisabled_ = disableCombined;
        } else if (sourceBuffer.videoCodec_ && !sourceBuffer.audioCodec_) {
          // If the "combined" source buffer is video only, then we do not want
          // disable the audio-only source buffer (this is mostly for demuxed
          // audio and video hls)
          sourceBuffer.audioDisabled_ = true;
          disableAudioOnly = false;
        } else if (!sourceBuffer.videoCodec_ && sourceBuffer.audioCodec_) {
          // audio only
          // In the case of audio only with alternate audio and disableAudioOnly is true
          // this means we want to disable the audio on the alternate audio sourcebuffer
          // but not the main "combined" source buffer. The "combined" source buffer is
          // always at index 0, so this ensures audio won't be disabled in both source
          // buffers.
          sourceBuffer.audioDisabled_ = index ? disableAudioOnly : !disableAudioOnly;
          if (sourceBuffer.audioDisabled_) {
            return;
          }
        }

        _this.activeSourceBuffers_.push(sourceBuffer);
      });
    };

    _this.onPlayerMediachange_ = function () {
      _this.sourceBuffers.forEach(function (sourceBuffer) {
        sourceBuffer.appendAudioInitSegment_ = true;
      });
    };

    _this.onHlsReset_ = function () {
      _this.sourceBuffers.forEach(function (sourceBuffer) {
        if (sourceBuffer.transmuxer_) {
          sourceBuffer.transmuxer_.postMessage({ action: 'resetCaptions' });
        }
      });
    };

    _this.onHlsSegmentTimeMapping_ = function (event) {
      _this.sourceBuffers.forEach(function (buffer) {
        return buffer.timeMapping_ = event.mapping;
      });
    };

    // Re-emit MediaSource events on the polyfill
    ['sourceopen', 'sourceclose', 'sourceended'].forEach(function (eventName) {
      this.nativeMediaSource_.addEventListener(eventName, this.trigger.bind(this));
    }, _this);

    // capture the associated player when the MediaSource is
    // successfully attached
    _this.on('sourceopen', function (event) {
      // Get the player this MediaSource is attached to
      var video = document.querySelector('[src="' + _this.url_ + '"]');

      if (!video) {
        return;
      }

      _this.player_ = videojs(video.parentNode);

      if (!_this.player_) {
        return;
      }

      // hls-reset is fired by videojs.Hls on to the tech after the main SegmentLoader
      // resets its state and flushes the buffer
      _this.player_.tech_.on('hls-reset', _this.onHlsReset_);
      // hls-segment-time-mapping is fired by videojs.Hls on to the tech after the main
      // SegmentLoader inspects an MTS segment and has an accurate stream to display
      // time mapping
      _this.player_.tech_.on('hls-segment-time-mapping', _this.onHlsSegmentTimeMapping_);

      if (_this.player_.audioTracks && _this.player_.audioTracks()) {
        _this.player_.audioTracks().on('change', _this.updateActiveSourceBuffers_);
        _this.player_.audioTracks().on('addtrack', _this.updateActiveSourceBuffers_);
        _this.player_.audioTracks().on('removetrack', _this.updateActiveSourceBuffers_);
      }

      _this.player_.on('mediachange', _this.onPlayerMediachange_);
    });

    _this.on('sourceended', function (event) {
      var duration = durationOfVideo(_this.duration);

      for (var i = 0; i < _this.sourceBuffers.length; i++) {
        var sourcebuffer = _this.sourceBuffers[i];
        var cues = sourcebuffer.metadataTrack_ && sourcebuffer.metadataTrack_.cues;

        if (cues && cues.length) {
          cues[cues.length - 1].endTime = duration;
        }
      }
    });

    // explicitly terminate any WebWorkers that were created
    // by SourceHandlers
    _this.on('sourceclose', function (event) {
      this.sourceBuffers.forEach(function (sourceBuffer) {
        if (sourceBuffer.transmuxer_) {
          sourceBuffer.transmuxer_.terminate();
        }
      });

      this.sourceBuffers.length = 0;
      if (!this.player_) {
        return;
      }

      if (this.player_.audioTracks && this.player_.audioTracks()) {
        this.player_.audioTracks().off('change', this.updateActiveSourceBuffers_);
        this.player_.audioTracks().off('addtrack', this.updateActiveSourceBuffers_);
        this.player_.audioTracks().off('removetrack', this.updateActiveSourceBuffers_);
      }

      // We can only change this if the player hasn't been disposed of yet
      // because `off` eventually tries to use the el_ property. If it has
      // been disposed of, then don't worry about it because there are no
      // event handlers left to unbind anyway
      if (this.player_.el_) {
        this.player_.off('mediachange', this.onPlayerMediachange_);
      }

      if (this.player_.tech_ && this.player_.tech_.el_) {
        this.player_.tech_.off('hls-reset', this.onHlsReset_);
        this.player_.tech_.off('hls-segment-time-mapping', this.onHlsSegmentTimeMapping_);
      }
    });
    return _this;
  }

  /**
   * Add a range that that can now be seeked to.
   *
   * @param {Double} start where to start the addition
   * @param {Double} end where to end the addition
   * @private
   */


  createClass(HtmlMediaSource, [{
    key: 'addSeekableRange_',
    value: function addSeekableRange_(start, end) {
      var error = void 0;

      if (this.duration !== Infinity) {
        error = new Error('MediaSource.addSeekableRange() can only be invoked ' + 'when the duration is Infinity');
        error.name = 'InvalidStateError';
        error.code = 11;
        throw error;
      }

      if (end > this.nativeMediaSource_.duration || isNaN(this.nativeMediaSource_.duration)) {
        this.nativeMediaSource_.duration = end;
      }
    }

    /**
     * Add a source buffer to the media source.
     *
     * @link https://developer.mozilla.org/en-US/docs/Web/API/MediaSource/addSourceBuffer
     * @param {String} type the content-type of the content
     * @return {Object} the created source buffer
     */

  }, {
    key: 'addSourceBuffer',
    value: function addSourceBuffer(type) {
      var buffer = void 0;
      var parsedType = parseContentType(type);

      // Create a VirtualSourceBuffer to transmux MPEG-2 transport
      // stream segments into fragmented MP4s
      if (/^(video|audio)\/mp2t$/i.test(parsedType.type)) {
        var codecs = [];

        if (parsedType.parameters && parsedType.parameters.codecs) {
          codecs = parsedType.parameters.codecs.split(',');
          codecs = translateLegacyCodecs(codecs);
          codecs = codecs.filter(function (codec) {
            return isAudioCodec(codec) || isVideoCodec(codec);
          });
        }

        if (codecs.length === 0) {
          codecs = ['avc1.4d400d', 'mp4a.40.2'];
        }

        buffer = new VirtualSourceBuffer(this, codecs);

        if (this.sourceBuffers.length !== 0) {
          // If another VirtualSourceBuffer already exists, then we are creating a
          // SourceBuffer for an alternate audio track and therefore we know that
          // the source has both an audio and video track.
          // That means we should trigger the manual creation of the real
          // SourceBuffers instead of waiting for the transmuxer to return data
          this.sourceBuffers[0].createRealSourceBuffers_();
          buffer.createRealSourceBuffers_();

          // Automatically disable the audio on the first source buffer if
          // a second source buffer is ever created
          this.sourceBuffers[0].audioDisabled_ = true;
        }
      } else {
        // delegate to the native implementation
        buffer = this.nativeMediaSource_.addSourceBuffer(type);
      }

      this.sourceBuffers.push(buffer);
      return buffer;
    }
  }]);
  return HtmlMediaSource;
}(videojs.EventTarget);

/**
 * @file videojs-contrib-media-sources.js
 */
var urlCount = 0;

// ------------
// Media Source
// ------------

// store references to the media sources so they can be connected
// to a video element (a swf object)
// TODO: can we store this somewhere local to this module?
videojs.mediaSources = {};

/**
 * Provide a method for a swf object to notify JS that a
 * media source is now open.
 *
 * @param {String} msObjectURL string referencing the MSE Object URL
 * @param {String} swfId the swf id
 */
var open = function open(msObjectURL, swfId) {
  var mediaSource = videojs.mediaSources[msObjectURL];

  if (mediaSource) {
    mediaSource.trigger({ type: 'sourceopen', swfId: swfId });
  } else {
    throw new Error('Media Source not found (Video.js)');
  }
};

/**
 * Check to see if the native MediaSource object exists and supports
 * an MP4 container with both H.264 video and AAC-LC audio.
 *
 * @return {Boolean} if  native media sources are supported
 */
var supportsNativeMediaSources = function supportsNativeMediaSources() {
  return !!window$1.MediaSource && !!window$1.MediaSource.isTypeSupported && window$1.MediaSource.isTypeSupported('video/mp4;codecs="avc1.4d400d,mp4a.40.2"');
};

/**
 * An emulation of the MediaSource API so that we can support
 * native and non-native functionality. returns an instance of
 * HtmlMediaSource.
 *
 * @link https://developer.mozilla.org/en-US/docs/Web/API/MediaSource/MediaSource
 */
var MediaSource = function MediaSource() {
  this.MediaSource = {
    open: open,
    supportsNativeMediaSources: supportsNativeMediaSources
  };

  if (supportsNativeMediaSources()) {
    return new HtmlMediaSource();
  }

  throw new Error('Cannot use create a virtual MediaSource for this video');
};

MediaSource.open = open;
MediaSource.supportsNativeMediaSources = supportsNativeMediaSources;

/**
 * A wrapper around the native URL for our MSE object
 * implementation, this object is exposed under videojs.URL
 *
 * @link https://developer.mozilla.org/en-US/docs/Web/API/URL/URL
 */
var URL$1 = {
  /**
   * A wrapper around the native createObjectURL for our objects.
   * This function maps a native or emulated mediaSource to a blob
   * url so that it can be loaded into video.js
   *
   * @link https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL
   * @param {MediaSource} object the object to create a blob url to
   */
  createObjectURL: function createObjectURL(object) {
    var objectUrlPrefix = 'blob:vjs-media-source/';
    var url = void 0;

    // use the native MediaSource to generate an object URL
    if (object instanceof HtmlMediaSource) {
      url = window$1.URL.createObjectURL(object.nativeMediaSource_);
      object.url_ = url;
      return url;
    }
    // if the object isn't an emulated MediaSource, delegate to the
    // native implementation
    if (!(object instanceof HtmlMediaSource)) {
      url = window$1.URL.createObjectURL(object);
      object.url_ = url;
      return url;
    }

    // build a URL that can be used to map back to the emulated
    // MediaSource
    url = objectUrlPrefix + urlCount;

    urlCount++;

    // setup the mapping back to object
    videojs.mediaSources[url] = object;

    return url;
  }
};

videojs.MediaSource = MediaSource;
videojs.URL = URL$1;

var EventTarget$1 = videojs.EventTarget,
    mergeOptions$2 = videojs.mergeOptions;

/**
 * Returns a new master manifest that is the result of merging an updated master manifest
 * into the original version.
 *
 * @param {Object} oldMaster
 *        The old parsed mpd object
 * @param {Object} newMaster
 *        The updated parsed mpd object
 * @return {Object}
 *         A new object representing the original master manifest with the updated media
 *         playlists merged in
 */

var updateMaster$1 = function updateMaster$$1(oldMaster, newMaster) {
  var noChanges = void 0;
  var update = mergeOptions$2(oldMaster, {
    // These are top level properties that can be updated
    duration: newMaster.duration,
    minimumUpdatePeriod: newMaster.minimumUpdatePeriod
  });

  // First update the playlists in playlist list
  for (var i = 0; i < newMaster.playlists.length; i++) {
    var playlistUpdate = updateMaster(update, newMaster.playlists[i]);

    if (playlistUpdate) {
      update = playlistUpdate;
    } else {
      noChanges = true;
    }
  }

  // Then update media group playlists
  forEachMediaGroup(newMaster, function (properties, type, group, label) {
    if (properties.playlists && properties.playlists.length) {
      var uri = properties.playlists[0].uri;
      var _playlistUpdate = updateMaster(update, properties.playlists[0]);

      if (_playlistUpdate) {
        update = _playlistUpdate;
        // update the playlist reference within media groups
        update.mediaGroups[type][group][label].playlists[0] = update.playlists[uri];
        noChanges = false;
      }
    }
  });

  if (noChanges) {
    return null;
  }

  return update;
};

var generateSidxKey = function generateSidxKey(sidxInfo) {
  // should be non-inclusive
  var sidxByteRangeEnd = sidxInfo.byterange.offset + sidxInfo.byterange.length - 1;

  return sidxInfo.uri + '-' + sidxInfo.byterange.offset + '-' + sidxByteRangeEnd;
};

// SIDX should be equivalent if the URI and byteranges of the SIDX match.
// If the SIDXs have maps, the two maps should match,
// both `a` and `b` missing SIDXs is considered matching.
// If `a` or `b` but not both have a map, they aren't matching.
var equivalentSidx = function equivalentSidx(a, b) {
  var neitherMap = Boolean(!a.map && !b.map);

  var equivalentMap = neitherMap || Boolean(a.map && b.map && a.map.byterange.offset === b.map.byterange.offset && a.map.byterange.length === b.map.byterange.length);

  return equivalentMap && a.uri === b.uri && a.byterange.offset === b.byterange.offset && a.byterange.length === b.byterange.length;
};

// exported for testing
var compareSidxEntry = function compareSidxEntry(playlists, oldSidxMapping) {
  var newSidxMapping = {};

  for (var uri in playlists) {
    var playlist = playlists[uri];
    var currentSidxInfo = playlist.sidx;

    if (currentSidxInfo) {
      var key = generateSidxKey(currentSidxInfo);

      if (!oldSidxMapping[key]) {
        break;
      }

      var savedSidxInfo = oldSidxMapping[key].sidxInfo;

      if (equivalentSidx(savedSidxInfo, currentSidxInfo)) {
        newSidxMapping[key] = oldSidxMapping[key];
      }
    }
  }

  return newSidxMapping;
};

/**
 *  A function that filters out changed items as they need to be requested separately.
 *
 *  The method is exported for testing
 *
 *  @param {Object} masterXml the mpd XML
 *  @param {string} srcUrl the mpd url
 *  @param {Date} clientOffset a time difference between server and client (passed through and not used)
 *  @param {Object} oldSidxMapping the SIDX to compare against
 */
var filterChangedSidxMappings = function filterChangedSidxMappings(masterXml, srcUrl, clientOffset, oldSidxMapping) {
  // Don't pass current sidx mapping
  var master = mpdParser.parse(masterXml, {
    manifestUri: srcUrl,
    clientOffset: clientOffset
  });

  var videoSidx = compareSidxEntry(master.playlists, oldSidxMapping);
  var mediaGroupSidx = videoSidx;

  forEachMediaGroup(master, function (properties, mediaType, groupKey, labelKey) {
    if (properties.playlists && properties.playlists.length) {
      var playlists = properties.playlists;

      mediaGroupSidx = mergeOptions$2(mediaGroupSidx, compareSidxEntry(playlists, oldSidxMapping));
    }
  });

  return mediaGroupSidx;
};

// exported for testing
var requestSidx_ = function requestSidx_(sidxRange, playlist, xhr, options, finishProcessingFn) {
  var sidxInfo = {
    // resolve the segment URL relative to the playlist
    uri: resolveManifestRedirect(options.handleManifestRedirects, sidxRange.resolvedUri),
    // resolvedUri: sidxRange.resolvedUri,
    byterange: sidxRange.byterange,
    // the segment's playlist
    playlist: playlist
  };

  var sidxRequestOptions = videojs.mergeOptions(sidxInfo, {
    responseType: 'arraybuffer',
    headers: segmentXhrHeaders(sidxInfo)
  });

  return xhr(sidxRequestOptions, finishProcessingFn);
};

var DashPlaylistLoader = function (_EventTarget) {
  inherits(DashPlaylistLoader, _EventTarget);

  // DashPlaylistLoader must accept either a src url or a playlist because subsequent
  // playlist loader setups from media groups will expect to be able to pass a playlist
  // (since there aren't external URLs to media playlists with DASH)
  function DashPlaylistLoader(srcUrlOrPlaylist, hls) {
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    var masterPlaylistLoader = arguments[3];
    classCallCheck(this, DashPlaylistLoader);

    var _this = possibleConstructorReturn(this, (DashPlaylistLoader.__proto__ || Object.getPrototypeOf(DashPlaylistLoader)).call(this));

    var _options$withCredenti = options.withCredentials,
        withCredentials = _options$withCredenti === undefined ? false : _options$withCredenti,
        _options$handleManife = options.handleManifestRedirects,
        handleManifestRedirects = _options$handleManife === undefined ? false : _options$handleManife;


    _this.hls_ = hls;
    _this.withCredentials = withCredentials;
    _this.handleManifestRedirects = handleManifestRedirects;

    if (!srcUrlOrPlaylist) {
      throw new Error('A non-empty playlist URL or playlist is required');
    }

    // event naming?
    _this.on('minimumUpdatePeriod', function () {
      _this.refreshXml_();
    });

    // live playlist staleness timeout
    _this.on('mediaupdatetimeout', function () {
      _this.refreshMedia_(_this.media().uri);
    });

    _this.state = 'HAVE_NOTHING';
    _this.loadedPlaylists_ = {};

    // initialize the loader state
    // The masterPlaylistLoader will be created with a string
    if (typeof srcUrlOrPlaylist === 'string') {
      _this.srcUrl = srcUrlOrPlaylist;
      // TODO: reset sidxMapping between period changes
      // once multi-period is refactored
      _this.sidxMapping_ = {};
      return possibleConstructorReturn(_this);
    }

    _this.setupChildLoader(masterPlaylistLoader, srcUrlOrPlaylist);
    return _this;
  }

  createClass(DashPlaylistLoader, [{
    key: 'setupChildLoader',
    value: function setupChildLoader(masterPlaylistLoader, playlist) {
      this.masterPlaylistLoader_ = masterPlaylistLoader;
      this.childPlaylist_ = playlist;
    }
  }, {
    key: 'dispose',
    value: function dispose() {
      this.stopRequest();
      this.loadedPlaylists_ = {};
      window$1.clearTimeout(this.minimumUpdatePeriodTimeout_);
      window$1.clearTimeout(this.mediaRequest_);
      window$1.clearTimeout(this.mediaUpdateTimeout);
    }
  }, {
    key: 'hasPendingRequest',
    value: function hasPendingRequest() {
      return this.request || this.mediaRequest_;
    }
  }, {
    key: 'stopRequest',
    value: function stopRequest() {
      if (this.request) {
        var oldRequest = this.request;

        this.request = null;
        oldRequest.onreadystatechange = null;
        oldRequest.abort();
      }
    }
  }, {
    key: 'sidxRequestFinished_',
    value: function sidxRequestFinished_(playlist, master, startingState, doneFn) {
      var _this2 = this;

      return function (err, request) {
        // disposed
        if (!_this2.request) {
          return;
        }

        // pending request is cleared
        _this2.request = null;

        if (err) {
          _this2.error = {
            status: request.status,
            message: 'DASH playlist request error at URL: ' + playlist.uri,
            response: request.response,
            // MEDIA_ERR_NETWORK
            code: 2
          };
          if (startingState) {
            _this2.state = startingState;
          }

          _this2.trigger('error');
          return doneFn(master, null);
        }

        var bytes = new Uint8Array(request.response);
        var sidx = mp4Inspector.parseSidx(bytes.subarray(8));

        return doneFn(master, sidx);
      };
    }
  }, {
    key: 'media',
    value: function media(playlist) {
      var _this3 = this;

      // getter
      if (!playlist) {
        return this.media_;
      }

      // setter
      if (this.state === 'HAVE_NOTHING') {
        throw new Error('Cannot switch media playlist from ' + this.state);
      }

      var startingState = this.state;

      // find the playlist object if the target playlist has been specified by URI
      if (typeof playlist === 'string') {
        if (!this.master.playlists[playlist]) {
          throw new Error('Unknown playlist URI: ' + playlist);
        }
        playlist = this.master.playlists[playlist];
      }

      var mediaChange = !this.media_ || playlist.uri !== this.media_.uri;

      // switch to previously loaded playlists immediately
      if (mediaChange && this.loadedPlaylists_[playlist.uri] && this.loadedPlaylists_[playlist.uri].endList) {
        this.state = 'HAVE_METADATA';
        this.media_ = playlist;

        // trigger media change if the active media has been updated
        if (mediaChange) {
          this.trigger('mediachanging');
          this.trigger('mediachange');
        }
        return;
      }

      // switching to the active playlist is a no-op
      if (!mediaChange) {
        return;
      }

      // switching from an already loaded playlist
      if (this.media_) {
        this.trigger('mediachanging');
      }

      if (!playlist.sidx) {
        // Continue asynchronously if there is no sidx
        // wait one tick to allow haveMaster to run first on a child loader
        this.mediaRequest_ = window$1.setTimeout(this.haveMetadata.bind(this, { startingState: startingState, playlist: playlist }), 0);

        // exit early and don't do sidx work
        return;
      }

      // we have sidx mappings
      var oldMaster = void 0;
      var sidxMapping = void 0;

      // sidxMapping is used when parsing the masterXml, so store
      // it on the masterPlaylistLoader
      if (this.masterPlaylistLoader_) {
        oldMaster = this.masterPlaylistLoader_.master;
        sidxMapping = this.masterPlaylistLoader_.sidxMapping_;
      } else {
        oldMaster = this.master;
        sidxMapping = this.sidxMapping_;
      }

      var sidxKey = generateSidxKey(playlist.sidx);

      sidxMapping[sidxKey] = {
        sidxInfo: playlist.sidx
      };

      this.request = requestSidx_(playlist.sidx, playlist, this.hls_.xhr, { handleManifestRedirects: this.handleManifestRedirects }, this.sidxRequestFinished_(playlist, oldMaster, startingState, function (newMaster, sidx) {
        if (!newMaster || !sidx) {
          throw new Error('failed to request sidx');
        }

        // update loader's sidxMapping with parsed sidx box
        sidxMapping[sidxKey].sidx = sidx;

        // everything is ready just continue to haveMetadata
        _this3.haveMetadata({
          startingState: startingState,
          playlist: newMaster.playlists[playlist.uri]
        });
      }));
    }
  }, {
    key: 'haveMetadata',
    value: function haveMetadata(_ref) {
      var startingState = _ref.startingState,
          playlist = _ref.playlist;

      this.state = 'HAVE_METADATA';
      this.loadedPlaylists_[playlist.uri] = playlist;
      this.mediaRequest_ = null;

      // This will trigger loadedplaylist
      this.refreshMedia_(playlist.uri);

      // fire loadedmetadata the first time a media playlist is loaded
      // to resolve setup of media groups
      if (startingState === 'HAVE_MASTER') {
        this.trigger('loadedmetadata');
      } else {
        // trigger media change if the active media has been updated
        this.trigger('mediachange');
      }
    }
  }, {
    key: 'pause',
    value: function pause() {
      this.stopRequest();
      window$1.clearTimeout(this.mediaUpdateTimeout);
      window$1.clearTimeout(this.minimumUpdatePeriodTimeout_);
      if (this.state === 'HAVE_NOTHING') {
        // If we pause the loader before any data has been retrieved, its as if we never
        // started, so reset to an unstarted state.
        this.started = false;
      }
    }
  }, {
    key: 'load',
    value: function load(isFinalRendition) {
      var _this4 = this;

      window$1.clearTimeout(this.mediaUpdateTimeout);
      window$1.clearTimeout(this.minimumUpdatePeriodTimeout_);

      var media = this.media();

      if (isFinalRendition) {
        var delay = media ? media.targetDuration / 2 * 1000 : 5 * 1000;

        this.mediaUpdateTimeout = window$1.setTimeout(function () {
          return _this4.load();
        }, delay);
        return;
      }

      // because the playlists are internal to the manifest, load should either load the
      // main manifest, or do nothing but trigger an event
      if (!this.started) {
        this.start();
        return;
      }

      this.trigger('loadedplaylist');
    }

    /**
     * Parses the master xml string and updates playlist uri references
     *
     * @return {Object}
     *         The parsed mpd manifest object
     */

  }, {
    key: 'parseMasterXml',
    value: function parseMasterXml() {
      var master = mpdParser.parse(this.masterXml_, {
        manifestUri: this.srcUrl,
        clientOffset: this.clientOffset_,
        sidxMapping: this.sidxMapping_
      });

      master.uri = this.srcUrl;

      // Set up phony URIs for the playlists since we won't have external URIs for DASH
      // but reference playlists by their URI throughout the project
      // TODO: Should we create the dummy uris in mpd-parser as well (leaning towards yes).
      for (var i = 0; i < master.playlists.length; i++) {
        var phonyUri = 'placeholder-uri-' + i;

        master.playlists[i].uri = phonyUri;
        // set up by URI references
        master.playlists[phonyUri] = master.playlists[i];
      }

      // set up phony URIs for the media group playlists since we won't have external
      // URIs for DASH but reference playlists by their URI throughout the project
      forEachMediaGroup(master, function (properties, mediaType, groupKey, labelKey) {
        if (properties.playlists && properties.playlists.length) {
          var _phonyUri = 'placeholder-uri-' + mediaType + '-' + groupKey + '-' + labelKey;

          properties.playlists[0].uri = _phonyUri;
          // setup URI references
          master.playlists[_phonyUri] = properties.playlists[0];
        }
      });

      setupMediaPlaylists(master);
      resolveMediaGroupUris(master);

      return master;
    }
  }, {
    key: 'start',
    value: function start() {
      var _this5 = this;

      this.started = true;

      // We don't need to request the master manifest again
      // Call this asynchronously to match the xhr request behavior below
      if (this.masterPlaylistLoader_) {
        this.mediaRequest_ = window$1.setTimeout(this.haveMaster_.bind(this), 0);
        return;
      }

      // request the specified URL
      this.request = this.hls_.xhr({
        uri: this.srcUrl,
        withCredentials: this.withCredentials
      }, function (error, req) {
        // disposed
        if (!_this5.request) {
          return;
        }

        // clear the loader's request reference
        _this5.request = null;

        if (error) {
          _this5.error = {
            status: req.status,
            message: 'DASH playlist request error at URL: ' + _this5.srcUrl,
            responseText: req.responseText,
            // MEDIA_ERR_NETWORK
            code: 2
          };
          if (_this5.state === 'HAVE_NOTHING') {
            _this5.started = false;
          }
          return _this5.trigger('error');
        }

        _this5.masterXml_ = req.responseText;

        if (req.responseHeaders && req.responseHeaders.date) {
          _this5.masterLoaded_ = Date.parse(req.responseHeaders.date);
        } else {
          _this5.masterLoaded_ = Date.now();
        }

        _this5.srcUrl = resolveManifestRedirect(_this5.handleManifestRedirects, _this5.srcUrl, req);

        _this5.syncClientServerClock_(_this5.onClientServerClockSync_.bind(_this5));
      });
    }

    /**
     * Parses the master xml for UTCTiming node to sync the client clock to the server
     * clock. If the UTCTiming node requires a HEAD or GET request, that request is made.
     *
     * @param {Function} done
     *        Function to call when clock sync has completed
     */

  }, {
    key: 'syncClientServerClock_',
    value: function syncClientServerClock_(done) {
      var _this6 = this;

      var utcTiming = mpdParser.parseUTCTiming(this.masterXml_);

      // No UTCTiming element found in the mpd. Use Date header from mpd request as the
      // server clock
      if (utcTiming === null) {
        this.clientOffset_ = this.masterLoaded_ - Date.now();
        return done();
      }

      if (utcTiming.method === 'DIRECT') {
        this.clientOffset_ = utcTiming.value - Date.now();
        return done();
      }

      this.request = this.hls_.xhr({
        uri: resolveUrl(this.srcUrl, utcTiming.value),
        method: utcTiming.method,
        withCredentials: this.withCredentials
      }, function (error, req) {
        // disposed
        if (!_this6.request) {
          return;
        }

        if (error) {
          // sync request failed, fall back to using date header from mpd
          // TODO: log warning
          _this6.clientOffset_ = _this6.masterLoaded_ - Date.now();
          return done();
        }

        var serverTime = void 0;

        if (utcTiming.method === 'HEAD') {
          if (!req.responseHeaders || !req.responseHeaders.date) {
            // expected date header not preset, fall back to using date header from mpd
            // TODO: log warning
            serverTime = _this6.masterLoaded_;
          } else {
            serverTime = Date.parse(req.responseHeaders.date);
          }
        } else {
          serverTime = Date.parse(req.responseText);
        }

        _this6.clientOffset_ = serverTime - Date.now();

        done();
      });
    }
  }, {
    key: 'haveMaster_',
    value: function haveMaster_() {
      this.state = 'HAVE_MASTER';
      // clear media request
      this.mediaRequest_ = null;

      if (!this.masterPlaylistLoader_) {
        this.master = this.parseMasterXml();
        // We have the master playlist at this point, so
        // trigger this to allow MasterPlaylistController
        // to make an initial playlist selection
        this.trigger('loadedplaylist');
      } else if (!this.media_) {
        // no media playlist was specifically selected so select
        // the one the child playlist loader was created with
        this.media(this.childPlaylist_);
      }
    }

    /**
     * Handler for after client/server clock synchronization has happened. Sets up
     * xml refresh timer if specificed by the manifest.
     */

  }, {
    key: 'onClientServerClockSync_',
    value: function onClientServerClockSync_() {
      var _this7 = this;

      this.haveMaster_();

      if (!this.hasPendingRequest() && !this.media_) {
        this.media(this.master.playlists[0]);
      }

      // TODO: minimumUpdatePeriod can have a value of 0. Currently the manifest will not
      // be refreshed when this is the case. The inter-op guide says that when the
      // minimumUpdatePeriod is 0, the manifest should outline all currently available
      // segments, but future segments may require an update. I think a good solution
      // would be to update the manifest at the same rate that the media playlists
      // are "refreshed", i.e. every targetDuration.
      if (this.master && this.master.minimumUpdatePeriod) {
        this.minimumUpdatePeriodTimeout_ = window$1.setTimeout(function () {
          _this7.trigger('minimumUpdatePeriod');
        }, this.master.minimumUpdatePeriod);
      }
    }

    /**
     * Sends request to refresh the master xml and updates the parsed master manifest
     * TODO: Does the client offset need to be recalculated when the xml is refreshed?
     */

  }, {
    key: 'refreshXml_',
    value: function refreshXml_() {
      var _this8 = this;

      // The srcUrl here *may* need to pass through handleManifestsRedirects when
      // sidx is implemented
      this.request = this.hls_.xhr({
        uri: this.srcUrl,
        withCredentials: this.withCredentials
      }, function (error, req) {
        // disposed
        if (!_this8.request) {
          return;
        }

        // clear the loader's request reference
        _this8.request = null;

        if (error) {
          _this8.error = {
            status: req.status,
            message: 'DASH playlist request error at URL: ' + _this8.srcUrl,
            responseText: req.responseText,
            // MEDIA_ERR_NETWORK
            code: 2
          };
          if (_this8.state === 'HAVE_NOTHING') {
            _this8.started = false;
          }
          return _this8.trigger('error');
        }

        _this8.masterXml_ = req.responseText;

        // This will filter out updated sidx info from the mapping
        _this8.sidxMapping_ = filterChangedSidxMappings(_this8.masterXml_, _this8.srcUrl, _this8.clientOffset_, _this8.sidxMapping_);

        var master = _this8.parseMasterXml();
        var updatedMaster = updateMaster$1(_this8.master, master);
        var currentSidxInfo = _this8.media().sidx;

        if (updatedMaster) {
          if (currentSidxInfo) {
            var sidxKey = generateSidxKey(currentSidxInfo);

            // the sidx was updated, so the previous mapping was removed
            if (!_this8.sidxMapping_[sidxKey]) {
              var playlist = _this8.media();

              _this8.request = requestSidx_(playlist.sidx, playlist, _this8.hls_.xhr, { handleManifestRedirects: _this8.handleManifestRedirects }, _this8.sidxRequestFinished_(playlist, master, _this8.state, function (newMaster, sidx) {
                if (!newMaster || !sidx) {
                  throw new Error('failed to request sidx on minimumUpdatePeriod');
                }

                // update loader's sidxMapping with parsed sidx box
                _this8.sidxMapping_[sidxKey].sidx = sidx;

                _this8.minimumUpdatePeriodTimeout_ = window$1.setTimeout(function () {
                  _this8.trigger('minimumUpdatePeriod');
                }, _this8.master.minimumUpdatePeriod);

                // TODO: do we need to reload the current playlist?
                _this8.refreshMedia_(_this8.media().uri);

                return;
              }));
            }
          } else {

            _this8.master = updatedMaster;
          }
        }

        _this8.minimumUpdatePeriodTimeout_ = window$1.setTimeout(function () {
          _this8.trigger('minimumUpdatePeriod');
        }, _this8.master.minimumUpdatePeriod);
      });
    }

    /**
     * Refreshes the media playlist by re-parsing the master xml and updating playlist
     * references. If this is an alternate loader, the updated parsed manifest is retrieved
     * from the master loader.
     */

  }, {
    key: 'refreshMedia_',
    value: function refreshMedia_(mediaUri) {
      var _this9 = this;

      if (!mediaUri) {
        throw new Error('refreshMedia_ must take a media uri');
      }

      var oldMaster = void 0;
      var newMaster = void 0;

      if (this.masterPlaylistLoader_) {
        oldMaster = this.masterPlaylistLoader_.master;
        newMaster = this.masterPlaylistLoader_.parseMasterXml();
      } else {
        oldMaster = this.master;
        newMaster = this.parseMasterXml();
      }

      var updatedMaster = updateMaster$1(oldMaster, newMaster);

      if (updatedMaster) {
        if (this.masterPlaylistLoader_) {
          this.masterPlaylistLoader_.master = updatedMaster;
        } else {
          this.master = updatedMaster;
        }
        this.media_ = updatedMaster.playlists[mediaUri];
      } else {
        this.media_ = newMaster.playlists[mediaUri];
        this.trigger('playlistunchanged');
      }

      if (!this.media().endList) {
        this.mediaUpdateTimeout = window$1.setTimeout(function () {
          _this9.trigger('mediaupdatetimeout');
        }, refreshDelay(this.media(), !!updatedMaster));
      }

      this.trigger('loadedplaylist');
    }
  }]);
  return DashPlaylistLoader;
}(EventTarget$1);

var logger = function logger(source) {
  if (videojs.log.debug) {
    return videojs.log.debug.bind(videojs, 'VHS:', source + ' >');
  }

  return function () {};
};

function noop() {}

/**
 * @file source-updater.js
 */

/**
 * A queue of callbacks to be serialized and applied when a
 * MediaSource and its associated SourceBuffers are not in the
 * updating state. It is used by the segment loader to update the
 * underlying SourceBuffers when new data is loaded, for instance.
 *
 * @class SourceUpdater
 * @param {MediaSource} mediaSource the MediaSource to create the
 * SourceBuffer from
 * @param {String} mimeType the desired MIME type of the underlying
 * SourceBuffer
 * @param {Object} sourceBufferEmitter an event emitter that fires when a source buffer is
 * added to the media source
 */

var SourceUpdater = function () {
  function SourceUpdater(mediaSource, mimeType, type, sourceBufferEmitter) {
    classCallCheck(this, SourceUpdater);

    this.callbacks_ = [];
    this.pendingCallback_ = null;
    this.timestampOffset_ = 0;
    this.mediaSource = mediaSource;
    this.processedAppend_ = false;
    this.type_ = type;
    this.mimeType_ = mimeType;
    this.logger_ = logger('SourceUpdater[' + type + '][' + mimeType + ']');

    if (mediaSource.readyState === 'closed') {
      mediaSource.addEventListener('sourceopen', this.createSourceBuffer_.bind(this, mimeType, sourceBufferEmitter));
    } else {
      this.createSourceBuffer_(mimeType, sourceBufferEmitter);
    }
  }

  createClass(SourceUpdater, [{
    key: 'createSourceBuffer_',
    value: function createSourceBuffer_(mimeType, sourceBufferEmitter) {
      var _this = this;

      this.sourceBuffer_ = this.mediaSource.addSourceBuffer(mimeType);

      this.logger_('created SourceBuffer');

      if (sourceBufferEmitter) {
        sourceBufferEmitter.trigger('sourcebufferadded');

        if (this.mediaSource.sourceBuffers.length < 2) {
          // There's another source buffer we must wait for before we can start updating
          // our own (or else we can get into a bad state, i.e., appending video/audio data
          // before the other video/audio source buffer is available and leading to a video
          // or audio only buffer).
          sourceBufferEmitter.on('sourcebufferadded', function () {
            _this.start_();
          });
          return;
        }
      }

      this.start_();
    }
  }, {
    key: 'start_',
    value: function start_() {
      var _this2 = this;

      this.started_ = true;

      // run completion handlers and process callbacks as updateend
      // events fire
      this.onUpdateendCallback_ = function () {
        var pendingCallback = _this2.pendingCallback_;

        _this2.pendingCallback_ = null;
        _this2.sourceBuffer_.removing = false;

        _this2.logger_('buffered [' + printableRange(_this2.buffered()) + ']');

        if (pendingCallback) {
          pendingCallback();
        }

        _this2.runCallback_();
      };

      this.sourceBuffer_.addEventListener('updateend', this.onUpdateendCallback_);

      this.runCallback_();
    }

    /**
     * Aborts the current segment and resets the segment parser.
     *
     * @param {Function} done function to call when done
     * @see http://w3c.github.io/media-source/#widl-SourceBuffer-abort-void
     */

  }, {
    key: 'abort',
    value: function abort(done) {
      var _this3 = this;

      if (this.processedAppend_) {
        this.queueCallback_(function () {
          _this3.sourceBuffer_.abort();
        }, done);
      }
    }

    /**
     * Queue an update to append an ArrayBuffer.
     *
     * @param {ArrayBuffer} bytes
     * @param {Function} done the function to call when done
     * @see http://www.w3.org/TR/media-source/#widl-SourceBuffer-appendBuffer-void-ArrayBuffer-data
     */

  }, {
    key: 'appendBuffer',
    value: function appendBuffer(config, done) {
      var _this4 = this;

      this.processedAppend_ = true;
      this.queueCallback_(function () {
        if (config.videoSegmentTimingInfoCallback) {
          _this4.sourceBuffer_.addEventListener('videoSegmentTimingInfo', config.videoSegmentTimingInfoCallback);
        }
        _this4.sourceBuffer_.appendBuffer(config.bytes);
      }, function () {
        if (config.videoSegmentTimingInfoCallback) {
          _this4.sourceBuffer_.removeEventListener('videoSegmentTimingInfo', config.videoSegmentTimingInfoCallback);
        }
        done();
      });
    }

    /**
     * Indicates what TimeRanges are buffered in the managed SourceBuffer.
     *
     * @see http://www.w3.org/TR/media-source/#widl-SourceBuffer-buffered
     */

  }, {
    key: 'buffered',
    value: function buffered() {
      if (!this.sourceBuffer_) {
        return videojs.createTimeRanges();
      }
      return this.sourceBuffer_.buffered;
    }

    /**
     * Queue an update to remove a time range from the buffer.
     *
     * @param {Number} start where to start the removal
     * @param {Number} end where to end the removal
     * @param {Function} [done=noop] optional callback to be executed when the remove
     * operation is complete
     * @see http://www.w3.org/TR/media-source/#widl-SourceBuffer-remove-void-double-start-unrestricted-double-end
     */

  }, {
    key: 'remove',
    value: function remove(start, end) {
      var _this5 = this;

      var done = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : noop;

      if (this.processedAppend_) {
        this.queueCallback_(function () {
          _this5.logger_('remove [' + start + ' => ' + end + ']');
          _this5.sourceBuffer_.removing = true;
          _this5.sourceBuffer_.remove(start, end);
        }, done);
      }
    }

    /**
     * Whether the underlying sourceBuffer is updating or not
     *
     * @return {Boolean} the updating status of the SourceBuffer
     */

  }, {
    key: 'updating',
    value: function updating() {
      // we are updating if the sourcebuffer is updating or
      return !this.sourceBuffer_ || this.sourceBuffer_.updating ||
      // if we have a pending callback that is not our internal noop
      !!this.pendingCallback_ && this.pendingCallback_ !== noop;
    }

    /**
     * Set/get the timestampoffset on the SourceBuffer
     *
     * @return {Number} the timestamp offset
     */

  }, {
    key: 'timestampOffset',
    value: function timestampOffset(offset) {
      var _this6 = this;

      if (typeof offset !== 'undefined') {
        this.queueCallback_(function () {
          _this6.sourceBuffer_.timestampOffset = offset;
          _this6.runCallback_();
        });
        this.timestampOffset_ = offset;
      }
      return this.timestampOffset_;
    }

    /**
     * Queue a callback to run
     */

  }, {
    key: 'queueCallback_',
    value: function queueCallback_(callback, done) {
      this.callbacks_.push([callback.bind(this), done]);
      this.runCallback_();
    }

    /**
     * Run a queued callback
     */

  }, {
    key: 'runCallback_',
    value: function runCallback_() {
      var callbacks = void 0;

      if (!this.updating() && this.callbacks_.length && this.started_) {
        callbacks = this.callbacks_.shift();
        this.pendingCallback_ = callbacks[1];
        callbacks[0]();
      }
    }

    /**
     * dispose of the source updater and the underlying sourceBuffer
     */

  }, {
    key: 'dispose',
    value: function dispose() {
      var _this7 = this;

      var disposeFn = function disposeFn() {
        if (_this7.sourceBuffer_ && _this7.mediaSource.readyState === 'open') {
          _this7.sourceBuffer_.abort();
        }
        _this7.sourceBuffer_.removeEventListener('updateend', disposeFn);
      };

      this.sourceBuffer_.removeEventListener('updateend', this.onUpdateendCallback_);
      if (this.sourceBuffer_.removing) {
        this.sourceBuffer_.addEventListener('updateend', disposeFn);
      } else {
        disposeFn();
      }
    }
  }]);
  return SourceUpdater;
}();

var Config = {
  GOAL_BUFFER_LENGTH: 30,
  MAX_GOAL_BUFFER_LENGTH: 60,
  GOAL_BUFFER_LENGTH_RATE: 1,
  // 0.5 MB/s
  INITIAL_BANDWIDTH: 4194304,
  // A fudge factor to apply to advertised playlist bitrates to account for
  // temporary flucations in client bandwidth
  BANDWIDTH_VARIANCE: 1.2,
  // How much of the buffer must be filled before we consider upswitching
  BUFFER_LOW_WATER_LINE: 0,
  MAX_BUFFER_LOW_WATER_LINE: 30,
  BUFFER_LOW_WATER_LINE_RATE: 1
};

var REQUEST_ERRORS = {
  FAILURE: 2,
  TIMEOUT: -101,
  ABORTED: -102
};

/**
 * Abort all requests
 *
 * @param {Object} activeXhrs - an object that tracks all XHR requests
 */
var abortAll = function abortAll(activeXhrs) {
  activeXhrs.forEach(function (xhr) {
    xhr.abort();
  });
};

/**
 * Gather important bandwidth stats once a request has completed
 *
 * @param {Object} request - the XHR request from which to gather stats
 */
var getRequestStats = function getRequestStats(request) {
  return {
    bandwidth: request.bandwidth,
    bytesReceived: request.bytesReceived || 0,
    roundTripTime: request.roundTripTime || 0
  };
};

/**
 * If possible gather bandwidth stats as a request is in
 * progress
 *
 * @param {Event} progressEvent - an event object from an XHR's progress event
 */
var getProgressStats = function getProgressStats(progressEvent) {
  var request = progressEvent.target;
  var roundTripTime = Date.now() - request.requestTime;
  var stats = {
    bandwidth: Infinity,
    bytesReceived: 0,
    roundTripTime: roundTripTime || 0
  };

  stats.bytesReceived = progressEvent.loaded;
  // This can result in Infinity if stats.roundTripTime is 0 but that is ok
  // because we should only use bandwidth stats on progress to determine when
  // abort a request early due to insufficient bandwidth
  stats.bandwidth = Math.floor(stats.bytesReceived / stats.roundTripTime * 8 * 1000);

  return stats;
};

/**
 * Handle all error conditions in one place and return an object
 * with all the information
 *
 * @param {Error|null} error - if non-null signals an error occured with the XHR
 * @param {Object} request -  the XHR request that possibly generated the error
 */
var handleErrors = function handleErrors(error, request) {
  if (request.timedout) {
    return {
      status: request.status,
      message: 'HLS request timed-out at URL: ' + request.uri,
      code: REQUEST_ERRORS.TIMEOUT,
      xhr: request
    };
  }

  if (request.aborted) {
    return {
      status: request.status,
      message: 'HLS request aborted at URL: ' + request.uri,
      code: REQUEST_ERRORS.ABORTED,
      xhr: request
    };
  }

  if (error) {
    return {
      status: request.status,
      message: 'HLS request errored at URL: ' + request.uri,
      code: REQUEST_ERRORS.FAILURE,
      xhr: request
    };
  }

  return null;
};

/**
 * Handle responses for key data and convert the key data to the correct format
 * for the decryption step later
 *
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 * @param {Function} finishProcessingFn - a callback to execute to continue processing
 *                                        this request
 */
var handleKeyResponse = function handleKeyResponse(segment, finishProcessingFn) {
  return function (error, request) {
    var response = request.response;
    var errorObj = handleErrors(error, request);

    if (errorObj) {
      return finishProcessingFn(errorObj, segment);
    }

    if (response.byteLength !== 16) {
      return finishProcessingFn({
        status: request.status,
        message: 'Invalid HLS key at URL: ' + request.uri,
        code: REQUEST_ERRORS.FAILURE,
        xhr: request
      }, segment);
    }

    var view = new DataView(response);

    segment.key.bytes = new Uint32Array([view.getUint32(0), view.getUint32(4), view.getUint32(8), view.getUint32(12)]);
    return finishProcessingFn(null, segment);
  };
};

/**
 * Handle init-segment responses
 *
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 * @param {Function} finishProcessingFn - a callback to execute to continue processing
 *                                        this request
 */
var handleInitSegmentResponse = function handleInitSegmentResponse(segment, captionParser, finishProcessingFn) {
  return function (error, request) {
    var response = request.response;
    var errorObj = handleErrors(error, request);

    if (errorObj) {
      return finishProcessingFn(errorObj, segment);
    }

    // stop processing if received empty content
    if (response.byteLength === 0) {
      return finishProcessingFn({
        status: request.status,
        message: 'Empty HLS segment content at URL: ' + request.uri,
        code: REQUEST_ERRORS.FAILURE,
        xhr: request
      }, segment);
    }

    segment.map.bytes = new Uint8Array(request.response);

    // Initialize CaptionParser if it hasn't been yet
    if (captionParser && !captionParser.isInitialized()) {
      captionParser.init();
    }

    segment.map.timescales = mp4probe.timescale(segment.map.bytes);
    segment.map.videoTrackIds = mp4probe.videoTrackIds(segment.map.bytes);

    return finishProcessingFn(null, segment);
  };
};

/**
 * Response handler for segment-requests being sure to set the correct
 * property depending on whether the segment is encryped or not
 * Also records and keeps track of stats that are used for ABR purposes
 *
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 * @param {Function} finishProcessingFn - a callback to execute to continue processing
 *                                        this request
 */
var handleSegmentResponse = function handleSegmentResponse(segment, captionParser, finishProcessingFn) {
  return function (error, request) {
    var response = request.response;
    var errorObj = handleErrors(error, request);
    var parsed = void 0;

    if (errorObj) {
      return finishProcessingFn(errorObj, segment);
    }

    // stop processing if received empty content
    if (response.byteLength === 0) {
      return finishProcessingFn({
        status: request.status,
        message: 'Empty HLS segment content at URL: ' + request.uri,
        code: REQUEST_ERRORS.FAILURE,
        xhr: request
      }, segment);
    }

    segment.stats = getRequestStats(request);

    if (segment.key) {
      segment.encryptedBytes = new Uint8Array(request.response);
    } else {
      segment.bytes = new Uint8Array(request.response);
    }

    // This is likely an FMP4 and has the init segment.
    // Run through the CaptionParser in case there are captions.
    if (captionParser && segment.map && segment.map.bytes) {
      // Initialize CaptionParser if it hasn't been yet
      if (!captionParser.isInitialized()) {
        captionParser.init();
      }

      parsed = captionParser.parse(segment.bytes, segment.map.videoTrackIds, segment.map.timescales);

      if (parsed && parsed.captions) {
        segment.captionStreams = parsed.captionStreams;
        segment.fmp4Captions = parsed.captions;
      }
    }

    return finishProcessingFn(null, segment);
  };
};

/**
 * Decrypt the segment via the decryption web worker
 *
 * @param {WebWorker} decrypter - a WebWorker interface to AES-128 decryption routines
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 * @param {Function} doneFn - a callback that is executed after decryption has completed
 */
var decryptSegment = function decryptSegment(decrypter, segment, doneFn) {
  var decryptionHandler = function decryptionHandler(event) {
    if (event.data.source === segment.requestId) {
      decrypter.removeEventListener('message', decryptionHandler);
      var decrypted = event.data.decrypted;

      segment.bytes = new Uint8Array(decrypted.bytes, decrypted.byteOffset, decrypted.byteLength);
      return doneFn(null, segment);
    }
  };

  decrypter.addEventListener('message', decryptionHandler);

  var keyBytes = void 0;

  if (segment.key.bytes.slice) {
    keyBytes = segment.key.bytes.slice();
  } else {
    keyBytes = new Uint32Array(Array.prototype.slice.call(segment.key.bytes));
  }

  // this is an encrypted segment
  // incrementally decrypt the segment
  decrypter.postMessage(createTransferableMessage({
    source: segment.requestId,
    encrypted: segment.encryptedBytes,
    key: keyBytes,
    iv: segment.key.iv
  }), [segment.encryptedBytes.buffer, keyBytes.buffer]);
};

/**
 * This function waits for all XHRs to finish (with either success or failure)
 * before continueing processing via it's callback. The function gathers errors
 * from each request into a single errors array so that the error status for
 * each request can be examined later.
 *
 * @param {Object} activeXhrs - an object that tracks all XHR requests
 * @param {WebWorker} decrypter - a WebWorker interface to AES-128 decryption routines
 * @param {Function} doneFn - a callback that is executed after all resources have been
 *                            downloaded and any decryption completed
 */
var waitForCompletion = function waitForCompletion(activeXhrs, decrypter, doneFn) {
  var count = 0;
  var didError = false;

  return function (error, segment) {
    if (didError) {
      return;
    }

    if (error) {
      didError = true;
      // If there are errors, we have to abort any outstanding requests
      abortAll(activeXhrs);

      // Even though the requests above are aborted, and in theory we could wait until we
      // handle the aborted events from those requests, there are some cases where we may
      // never get an aborted event. For instance, if the network connection is lost and
      // there were two requests, the first may have triggered an error immediately, while
      // the second request remains unsent. In that case, the aborted algorithm will not
      // trigger an abort: see https://xhr.spec.whatwg.org/#the-abort()-method
      //
      // We also can't rely on the ready state of the XHR, since the request that
      // triggered the connection error may also show as a ready state of 0 (unsent).
      // Therefore, we have to finish this group of requests immediately after the first
      // seen error.
      return doneFn(error, segment);
    }

    count += 1;

    if (count === activeXhrs.length) {
      // Keep track of when *all* of the requests have completed
      segment.endOfAllRequests = Date.now();

      if (segment.encryptedBytes) {
        return decryptSegment(decrypter, segment, doneFn);
      }
      // Otherwise, everything is ready just continue
      return doneFn(null, segment);
    }
  };
};

/**
 * Simple progress event callback handler that gathers some stats before
 * executing a provided callback with the `segment` object
 *
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 * @param {Function} progressFn - a callback that is executed each time a progress event
 *                                is received
 * @param {Event} event - the progress event object from XMLHttpRequest
 */
var handleProgress = function handleProgress(segment, progressFn) {
  return function (event) {
    segment.stats = videojs.mergeOptions(segment.stats, getProgressStats(event));

    // record the time that we receive the first byte of data
    if (!segment.stats.firstBytesReceivedAt && segment.stats.bytesReceived) {
      segment.stats.firstBytesReceivedAt = Date.now();
    }

    return progressFn(event, segment);
  };
};

/**
 * Load all resources and does any processing necessary for a media-segment
 *
 * Features:
 *   decrypts the media-segment if it has a key uri and an iv
 *   aborts *all* requests if *any* one request fails
 *
 * The segment object, at minimum, has the following format:
 * {
 *   resolvedUri: String,
 *   [byterange]: {
 *     offset: Number,
 *     length: Number
 *   },
 *   [key]: {
 *     resolvedUri: String
 *     [byterange]: {
 *       offset: Number,
 *       length: Number
 *     },
 *     iv: {
 *       bytes: Uint32Array
 *     }
 *   },
 *   [map]: {
 *     resolvedUri: String,
 *     [byterange]: {
 *       offset: Number,
 *       length: Number
 *     },
 *     [bytes]: Uint8Array
 *   }
 * }
 * ...where [name] denotes optional properties
 *
 * @param {Function} xhr - an instance of the xhr wrapper in xhr.js
 * @param {Object} xhrOptions - the base options to provide to all xhr requests
 * @param {WebWorker} decryptionWorker - a WebWorker interface to AES-128
 *                                       decryption routines
 * @param {Object} segment - a simplified copy of the segmentInfo object
 *                           from SegmentLoader
 * @param {Function} progressFn - a callback that receives progress events from the main
 *                                segment's xhr request
 * @param {Function} doneFn - a callback that is executed only once all requests have
 *                            succeeded or failed
 * @returns {Function} a function that, when invoked, immediately aborts all
 *                     outstanding requests
 */
var mediaSegmentRequest = function mediaSegmentRequest(xhr, xhrOptions, decryptionWorker, captionParser, segment, progressFn, doneFn) {
  var activeXhrs = [];
  var finishProcessingFn = waitForCompletion(activeXhrs, decryptionWorker, doneFn);

  // optionally, request the decryption key
  if (segment.key && !segment.key.bytes) {
    var keyRequestOptions = videojs.mergeOptions(xhrOptions, {
      uri: segment.key.resolvedUri,
      responseType: 'arraybuffer'
    });
    var keyRequestCallback = handleKeyResponse(segment, finishProcessingFn);
    var keyXhr = xhr(keyRequestOptions, keyRequestCallback);

    activeXhrs.push(keyXhr);
  }

  // optionally, request the associated media init segment
  if (segment.map && !segment.map.bytes) {
    var initSegmentOptions = videojs.mergeOptions(xhrOptions, {
      uri: segment.map.resolvedUri,
      responseType: 'arraybuffer',
      headers: segmentXhrHeaders(segment.map)
    });
    var initSegmentRequestCallback = handleInitSegmentResponse(segment, captionParser, finishProcessingFn);
    var initSegmentXhr = xhr(initSegmentOptions, initSegmentRequestCallback);

    activeXhrs.push(initSegmentXhr);
  }

  var segmentRequestOptions = videojs.mergeOptions(xhrOptions, {
    uri: segment.resolvedUri,
    responseType: 'arraybuffer',
    headers: segmentXhrHeaders(segment)
  });
  var segmentRequestCallback = handleSegmentResponse(segment, captionParser, finishProcessingFn);
  var segmentXhr = xhr(segmentRequestOptions, segmentRequestCallback);

  segmentXhr.addEventListener('progress', handleProgress(segment, progressFn));
  activeXhrs.push(segmentXhr);

  return function () {
    return abortAll(activeXhrs);
  };
};

// Utilities

/**
 * Returns the CSS value for the specified property on an element
 * using `getComputedStyle`. Firefox has a long-standing issue where
 * getComputedStyle() may return null when running in an iframe with
 * `display: none`.
 *
 * @see https://bugzilla.mozilla.org/show_bug.cgi?id=548397
 * @param {HTMLElement} el the htmlelement to work on
 * @param {string} the proprety to get the style for
 */
var safeGetComputedStyle = function safeGetComputedStyle(el, property) {
  var result = void 0;

  if (!el) {
    return '';
  }

  result = window$1.getComputedStyle(el);
  if (!result) {
    return '';
  }

  return result[property];
};

/**
 * Resuable stable sort function
 *
 * @param {Playlists} array
 * @param {Function} sortFn Different comparators
 * @function stableSort
 */
var stableSort = function stableSort(array, sortFn) {
  var newArray = array.slice();

  array.sort(function (left, right) {
    var cmp = sortFn(left, right);

    if (cmp === 0) {
      return newArray.indexOf(left) - newArray.indexOf(right);
    }
    return cmp;
  });
};

/**
 * A comparator function to sort two playlist object by bandwidth.
 *
 * @param {Object} left a media playlist object
 * @param {Object} right a media playlist object
 * @return {Number} Greater than zero if the bandwidth attribute of
 * left is greater than the corresponding attribute of right. Less
 * than zero if the bandwidth of right is greater than left and
 * exactly zero if the two are equal.
 */
var comparePlaylistBandwidth = function comparePlaylistBandwidth(left, right) {
  var leftBandwidth = void 0;
  var rightBandwidth = void 0;

  if (left.attributes.BANDWIDTH) {
    leftBandwidth = left.attributes.BANDWIDTH;
  }
  leftBandwidth = leftBandwidth || window$1.Number.MAX_VALUE;
  if (right.attributes.BANDWIDTH) {
    rightBandwidth = right.attributes.BANDWIDTH;
  }
  rightBandwidth = rightBandwidth || window$1.Number.MAX_VALUE;

  return leftBandwidth - rightBandwidth;
};

/**
 * A comparator function to sort two playlist object by resolution (width).
 * @param {Object} left a media playlist object
 * @param {Object} right a media playlist object
 * @return {Number} Greater than zero if the resolution.width attribute of
 * left is greater than the corresponding attribute of right. Less
 * than zero if the resolution.width of right is greater than left and
 * exactly zero if the two are equal.
 */
var comparePlaylistResolution = function comparePlaylistResolution(left, right) {
  var leftWidth = void 0;
  var rightWidth = void 0;

  if (left.attributes.RESOLUTION && left.attributes.RESOLUTION.width) {
    leftWidth = left.attributes.RESOLUTION.width;
  }

  leftWidth = leftWidth || window$1.Number.MAX_VALUE;

  if (right.attributes.RESOLUTION && right.attributes.RESOLUTION.width) {
    rightWidth = right.attributes.RESOLUTION.width;
  }

  rightWidth = rightWidth || window$1.Number.MAX_VALUE;

  // NOTE - Fallback to bandwidth sort as appropriate in cases where multiple renditions
  // have the same media dimensions/ resolution
  if (leftWidth === rightWidth && left.attributes.BANDWIDTH && right.attributes.BANDWIDTH) {
    return left.attributes.BANDWIDTH - right.attributes.BANDWIDTH;
  }
  return leftWidth - rightWidth;
};

/**
 * Chooses the appropriate media playlist based on bandwidth and player size
 *
 * @param {Object} master
 *        Object representation of the master manifest
 * @param {Number} playerBandwidth
 *        Current calculated bandwidth of the player
 * @param {Number} playerWidth
 *        Current width of the player element
 * @param {Number} playerHeight
 *        Current height of the player element
 * @param {Boolean} limitRenditionByPlayerDimensions
 *        True if the player width and height should be used during the selection, false otherwise
 * @return {Playlist} the highest bitrate playlist less than the
 * currently detected bandwidth, accounting for some amount of
 * bandwidth variance
 */
var simpleSelector = function simpleSelector(master, playerBandwidth, playerWidth, playerHeight, limitRenditionByPlayerDimensions) {
  // convert the playlists to an intermediary representation to make comparisons easier
  var sortedPlaylistReps = master.playlists.map(function (playlist) {
    var width = void 0;
    var height = void 0;
    var bandwidth = void 0;

    width = playlist.attributes.RESOLUTION && playlist.attributes.RESOLUTION.width;
    height = playlist.attributes.RESOLUTION && playlist.attributes.RESOLUTION.height;
    bandwidth = playlist.attributes.BANDWIDTH;

    bandwidth = bandwidth || window$1.Number.MAX_VALUE;

    return {
      bandwidth: bandwidth,
      width: width,
      height: height,
      playlist: playlist
    };
  });

  stableSort(sortedPlaylistReps, function (left, right) {
    return left.bandwidth - right.bandwidth;
  });

  // filter out any playlists that have been excluded due to
  // incompatible configurations
  sortedPlaylistReps = sortedPlaylistReps.filter(function (rep) {
    return !Playlist.isIncompatible(rep.playlist);
  });

  // filter out any playlists that have been disabled manually through the representations
  // api or blacklisted temporarily due to playback errors.
  var enabledPlaylistReps = sortedPlaylistReps.filter(function (rep) {
    return Playlist.isEnabled(rep.playlist);
  });

  if (!enabledPlaylistReps.length) {
    // if there are no enabled playlists, then they have all been blacklisted or disabled
    // by the user through the representations api. In this case, ignore blacklisting and
    // fallback to what the user wants by using playlists the user has not disabled.
    enabledPlaylistReps = sortedPlaylistReps.filter(function (rep) {
      return !Playlist.isDisabled(rep.playlist);
    });
  }

  // filter out any variant that has greater effective bitrate
  // than the current estimated bandwidth
  var bandwidthPlaylistReps = enabledPlaylistReps.filter(function (rep) {
    return rep.bandwidth * Config.BANDWIDTH_VARIANCE < playerBandwidth;
  });

  var highestRemainingBandwidthRep = bandwidthPlaylistReps[bandwidthPlaylistReps.length - 1];

  // get all of the renditions with the same (highest) bandwidth
  // and then taking the very first element
  var bandwidthBestRep = bandwidthPlaylistReps.filter(function (rep) {
    return rep.bandwidth === highestRemainingBandwidthRep.bandwidth;
  })[0];

  // if we're not going to limit renditions by player size, make an early decision.
  if (limitRenditionByPlayerDimensions === false) {
    var _chosenRep = bandwidthBestRep || enabledPlaylistReps[0] || sortedPlaylistReps[0];

    return _chosenRep ? _chosenRep.playlist : null;
  }

  // filter out playlists without resolution information
  var haveResolution = bandwidthPlaylistReps.filter(function (rep) {
    return rep.width && rep.height;
  });

  // sort variants by resolution
  stableSort(haveResolution, function (left, right) {
    return left.width - right.width;
  });

  // if we have the exact resolution as the player use it
  var resolutionBestRepList = haveResolution.filter(function (rep) {
    return rep.width === playerWidth && rep.height === playerHeight;
  });

  highestRemainingBandwidthRep = resolutionBestRepList[resolutionBestRepList.length - 1];
  // ensure that we pick the highest bandwidth variant that have exact resolution
  var resolutionBestRep = resolutionBestRepList.filter(function (rep) {
    return rep.bandwidth === highestRemainingBandwidthRep.bandwidth;
  })[0];

  var resolutionPlusOneList = void 0;
  var resolutionPlusOneSmallest = void 0;
  var resolutionPlusOneRep = void 0;

  // find the smallest variant that is larger than the player
  // if there is no match of exact resolution
  if (!resolutionBestRep) {
    resolutionPlusOneList = haveResolution.filter(function (rep) {
      return rep.width > playerWidth || rep.height > playerHeight;
    });

    // find all the variants have the same smallest resolution
    resolutionPlusOneSmallest = resolutionPlusOneList.filter(function (rep) {
      return rep.width === resolutionPlusOneList[0].width && rep.height === resolutionPlusOneList[0].height;
    });

    // ensure that we also pick the highest bandwidth variant that
    // is just-larger-than the video player
    highestRemainingBandwidthRep = resolutionPlusOneSmallest[resolutionPlusOneSmallest.length - 1];
    resolutionPlusOneRep = resolutionPlusOneSmallest.filter(function (rep) {
      return rep.bandwidth === highestRemainingBandwidthRep.bandwidth;
    })[0];
  }

  // fallback chain of variants
  var chosenRep = resolutionPlusOneRep || resolutionBestRep || bandwidthBestRep || enabledPlaylistReps[0] || sortedPlaylistReps[0];

  return chosenRep ? chosenRep.playlist : null;
};

// Playlist Selectors

/**
 * Chooses the appropriate media playlist based on the most recent
 * bandwidth estimate and the player size.
 *
 * Expects to be called within the context of an instance of HlsHandler
 *
 * @return {Playlist} the highest bitrate playlist less than the
 * currently detected bandwidth, accounting for some amount of
 * bandwidth variance
 */
var lastBandwidthSelector = function lastBandwidthSelector() {
  return simpleSelector(this.playlists.master, this.systemBandwidth, parseInt(safeGetComputedStyle(this.tech_.el(), 'width'), 10), parseInt(safeGetComputedStyle(this.tech_.el(), 'height'), 10), this.limitRenditionByPlayerDimensions);
};

/**
 * Chooses the appropriate media playlist based on the potential to rebuffer
 *
 * @param {Object} settings
 *        Object of information required to use this selector
 * @param {Object} settings.master
 *        Object representation of the master manifest
 * @param {Number} settings.currentTime
 *        The current time of the player
 * @param {Number} settings.bandwidth
 *        Current measured bandwidth
 * @param {Number} settings.duration
 *        Duration of the media
 * @param {Number} settings.segmentDuration
 *        Segment duration to be used in round trip time calculations
 * @param {Number} settings.timeUntilRebuffer
 *        Time left in seconds until the player has to rebuffer
 * @param {Number} settings.currentTimeline
 *        The current timeline segments are being loaded from
 * @param {SyncController} settings.syncController
 *        SyncController for determining if we have a sync point for a given playlist
 * @return {Object|null}
 *         {Object} return.playlist
 *         The highest bandwidth playlist with the least amount of rebuffering
 *         {Number} return.rebufferingImpact
 *         The amount of time in seconds switching to this playlist will rebuffer. A
 *         negative value means that switching will cause zero rebuffering.
 */
var minRebufferMaxBandwidthSelector = function minRebufferMaxBandwidthSelector(settings) {
  var master = settings.master,
      currentTime = settings.currentTime,
      bandwidth = settings.bandwidth,
      duration$$1 = settings.duration,
      segmentDuration = settings.segmentDuration,
      timeUntilRebuffer = settings.timeUntilRebuffer,
      currentTimeline = settings.currentTimeline,
      syncController = settings.syncController;

  // filter out any playlists that have been excluded due to
  // incompatible configurations

  var compatiblePlaylists = master.playlists.filter(function (playlist) {
    return !Playlist.isIncompatible(playlist);
  });

  // filter out any playlists that have been disabled manually through the representations
  // api or blacklisted temporarily due to playback errors.
  var enabledPlaylists = compatiblePlaylists.filter(Playlist.isEnabled);

  if (!enabledPlaylists.length) {
    // if there are no enabled playlists, then they have all been blacklisted or disabled
    // by the user through the representations api. In this case, ignore blacklisting and
    // fallback to what the user wants by using playlists the user has not disabled.
    enabledPlaylists = compatiblePlaylists.filter(function (playlist) {
      return !Playlist.isDisabled(playlist);
    });
  }

  var bandwidthPlaylists = enabledPlaylists.filter(Playlist.hasAttribute.bind(null, 'BANDWIDTH'));

  var rebufferingEstimates = bandwidthPlaylists.map(function (playlist) {
    var syncPoint = syncController.getSyncPoint(playlist, duration$$1, currentTimeline, currentTime);
    // If there is no sync point for this playlist, switching to it will require a
    // sync request first. This will double the request time
    var numRequests = syncPoint ? 1 : 2;
    var requestTimeEstimate = Playlist.estimateSegmentRequestTime(segmentDuration, bandwidth, playlist);
    var rebufferingImpact = requestTimeEstimate * numRequests - timeUntilRebuffer;

    return {
      playlist: playlist,
      rebufferingImpact: rebufferingImpact
    };
  });

  var noRebufferingPlaylists = rebufferingEstimates.filter(function (estimate) {
    return estimate.rebufferingImpact <= 0;
  });

  // Sort by bandwidth DESC
  stableSort(noRebufferingPlaylists, function (a, b) {
    return comparePlaylistBandwidth(b.playlist, a.playlist);
  });

  if (noRebufferingPlaylists.length) {
    return noRebufferingPlaylists[0];
  }

  stableSort(rebufferingEstimates, function (a, b) {
    return a.rebufferingImpact - b.rebufferingImpact;
  });

  return rebufferingEstimates[0] || null;
};

/**
 * Chooses the appropriate media playlist, which in this case is the lowest bitrate
 * one with video.  If no renditions with video exist, return the lowest audio rendition.
 *
 * Expects to be called within the context of an instance of HlsHandler
 *
 * @return {Object|null}
 *         {Object} return.playlist
 *         The lowest bitrate playlist that contains a video codec.  If no such rendition
 *         exists pick the lowest audio rendition.
 */
var lowestBitrateCompatibleVariantSelector = function lowestBitrateCompatibleVariantSelector() {
  // filter out any playlists that have been excluded due to
  // incompatible configurations or playback errors
  var playlists = this.playlists.master.playlists.filter(Playlist.isEnabled);

  // Sort ascending by bitrate
  stableSort(playlists, function (a, b) {
    return comparePlaylistBandwidth(a, b);
  });

  // Parse and assume that playlists with no video codec have no video
  // (this is not necessarily true, although it is generally true).
  //
  // If an entire manifest has no valid videos everything will get filtered
  // out.
  var playlistsWithVideo = playlists.filter(function (playlist) {
    return parseCodecs(playlist.attributes.CODECS).videoCodec;
  });

  return playlistsWithVideo[0] || null;
};

/**
 * Create captions text tracks on video.js if they do not exist
 *
 * @param {Object} inbandTextTracks a reference to current inbandTextTracks
 * @param {Object} tech the video.js tech
 * @param {Object} captionStreams the caption streams to create
 * @private
 */
var createCaptionsTrackIfNotExists = function createCaptionsTrackIfNotExists(inbandTextTracks, tech, captionStreams) {
  for (var trackId in captionStreams) {
    if (!inbandTextTracks[trackId]) {
      tech.trigger({ type: 'usage', name: 'hls-608' });
      var track = tech.textTracks().getTrackById(trackId);

      if (track) {
        // Resuse an existing track with a CC# id because this was
        // very likely created by videojs-contrib-hls from information
        // in the m3u8 for us to use
        inbandTextTracks[trackId] = track;
      } else {
        // Otherwise, create a track with the default `CC#` label and
        // without a language
        inbandTextTracks[trackId] = tech.addRemoteTextTrack({
          kind: 'captions',
          id: trackId,
          label: trackId
        }, false).track;
      }
    }
  }
};

var addCaptionData = function addCaptionData(_ref) {
  var inbandTextTracks = _ref.inbandTextTracks,
      captionArray = _ref.captionArray,
      timestampOffset = _ref.timestampOffset;

  if (!captionArray) {
    return;
  }

  var Cue = window.WebKitDataCue || window.VTTCue;

  captionArray.forEach(function (caption) {
    var track = caption.stream;
    var startTime = caption.startTime;
    var endTime = caption.endTime;

    if (!inbandTextTracks[track]) {
      return;
    }

    startTime += timestampOffset;
    endTime += timestampOffset;

    inbandTextTracks[track].addCue(new Cue(startTime, endTime, caption.text));
  });
};

/**
 * @file segment-loader.js
 */

// in ms
var CHECK_BUFFER_DELAY = 500;

/**
 * Determines if we should call endOfStream on the media source based
 * on the state of the buffer or if appened segment was the final
 * segment in the playlist.
 *
 * @param {Object} playlist a media playlist object
 * @param {Object} mediaSource the MediaSource object
 * @param {Number} segmentIndex the index of segment we last appended
 * @returns {Boolean} do we need to call endOfStream on the MediaSource
 */
var detectEndOfStream = function detectEndOfStream(playlist, mediaSource, segmentIndex) {
  if (!playlist || !mediaSource) {
    return false;
  }

  var segments = playlist.segments;

  // determine a few boolean values to help make the branch below easier
  // to read
  var appendedLastSegment = segmentIndex === segments.length;

  // if we've buffered to the end of the video, we need to call endOfStream
  // so that MediaSources can trigger the `ended` event when it runs out of
  // buffered data instead of waiting for me
  return playlist.endList && mediaSource.readyState === 'open' && appendedLastSegment;
};

var finite = function finite(num) {
  return typeof num === 'number' && isFinite(num);
};

var illegalMediaSwitch = function illegalMediaSwitch(loaderType, startingMedia, newSegmentMedia) {
  // Although these checks should most likely cover non 'main' types, for now it narrows
  // the scope of our checks.
  if (loaderType !== 'main' || !startingMedia || !newSegmentMedia) {
    return null;
  }

  if (!newSegmentMedia.containsAudio && !newSegmentMedia.containsVideo) {
    return 'Neither audio nor video found in segment.';
  }

  if (startingMedia.containsVideo && !newSegmentMedia.containsVideo) {
    return 'Only audio found in segment when we expected video.' + ' We can\'t switch to audio only from a stream that had video.' + ' To get rid of this message, please add codec information to the manifest.';
  }

  if (!startingMedia.containsVideo && newSegmentMedia.containsVideo) {
    return 'Video found in segment when we expected only audio.' + ' We can\'t switch to a stream with video from an audio only stream.' + ' To get rid of this message, please add codec information to the manifest.';
  }

  return null;
};

/**
 * Calculates a time value that is safe to remove from the back buffer without interupting
 * playback.
 *
 * @param {TimeRange} seekable
 *        The current seekable range
 * @param {Number} currentTime
 *        The current time of the player
 * @param {Number} targetDuration
 *        The target duration of the current playlist
 * @return {Number}
 *         Time that is safe to remove from the back buffer without interupting playback
 */
var safeBackBufferTrimTime = function safeBackBufferTrimTime(seekable$$1, currentTime, targetDuration) {
  var removeToTime = void 0;

  if (seekable$$1.length && seekable$$1.start(0) > 0 && seekable$$1.start(0) < currentTime) {
    // If we have a seekable range use that as the limit for what can be removed safely
    removeToTime = seekable$$1.start(0);
  } else {
    // otherwise remove anything older than 30 seconds before the current play head
    removeToTime = currentTime - 30;
  }

  // Don't allow removing from the buffer within target duration of current time
  // to avoid the possibility of removing the GOP currently being played which could
  // cause playback stalls.
  return Math.min(removeToTime, currentTime - targetDuration);
};

var segmentInfoString = function segmentInfoString(segmentInfo) {
  var _segmentInfo$segment = segmentInfo.segment,
      start = _segmentInfo$segment.start,
      end = _segmentInfo$segment.end,
      _segmentInfo$playlist = segmentInfo.playlist,
      seq = _segmentInfo$playlist.mediaSequence,
      id = _segmentInfo$playlist.id,
      _segmentInfo$playlist2 = _segmentInfo$playlist.segments,
      segments = _segmentInfo$playlist2 === undefined ? [] : _segmentInfo$playlist2,
      index = segmentInfo.mediaIndex,
      timeline = segmentInfo.timeline;


  return ['appending [' + index + '] of [' + seq + ', ' + (seq + segments.length) + '] from playlist [' + id + ']', '[' + start + ' => ' + end + '] in timeline [' + timeline + ']'].join(' ');
};

/**
 * An object that manages segment loading and appending.
 *
 * @class SegmentLoader
 * @param {Object} options required and optional options
 * @extends videojs.EventTarget
 */

var SegmentLoader = function (_videojs$EventTarget) {
  inherits(SegmentLoader, _videojs$EventTarget);

  function SegmentLoader(settings) {
    classCallCheck(this, SegmentLoader);

    // check pre-conditions
    var _this = possibleConstructorReturn(this, (SegmentLoader.__proto__ || Object.getPrototypeOf(SegmentLoader)).call(this));

    if (!settings) {
      throw new TypeError('Initialization settings are required');
    }
    if (typeof settings.currentTime !== 'function') {
      throw new TypeError('No currentTime getter specified');
    }
    if (!settings.mediaSource) {
      throw new TypeError('No MediaSource specified');
    }
    // public properties
    _this.bandwidth = settings.bandwidth;
    _this.throughput = { rate: 0, count: 0 };
    _this.roundTrip = NaN;
    _this.resetStats_();
    _this.mediaIndex = null;

    // private settings
    _this.hasPlayed_ = settings.hasPlayed;
    _this.currentTime_ = settings.currentTime;
    _this.seekable_ = settings.seekable;
    _this.seeking_ = settings.seeking;
    _this.duration_ = settings.duration;
    _this.mediaSource_ = settings.mediaSource;
    _this.hls_ = settings.hls;
    _this.loaderType_ = settings.loaderType;
    _this.startingMedia_ = void 0;
    _this.segmentMetadataTrack_ = settings.segmentMetadataTrack;
    _this.goalBufferLength_ = settings.goalBufferLength;
    _this.sourceType_ = settings.sourceType;
    _this.inbandTextTracks_ = settings.inbandTextTracks;
    _this.state_ = 'INIT';

    // private instance variables
    _this.checkBufferTimeout_ = null;
    _this.error_ = void 0;
    _this.currentTimeline_ = -1;
    _this.pendingSegment_ = null;
    _this.mimeType_ = null;
    _this.sourceUpdater_ = null;
    _this.xhrOptions_ = null;

    // Fragmented mp4 playback
    _this.activeInitSegmentId_ = null;
    _this.initSegments_ = {};

    // HLSe playback
    _this.cacheEncryptionKeys_ = settings.cacheEncryptionKeys;
    _this.keyCache_ = {};

    // Fmp4 CaptionParser
    if (_this.loaderType_ === 'main') {
      _this.captionParser_ = new CaptionParser();
    } else {
      _this.captionParser_ = null;
    }

    _this.decrypter_ = settings.decrypter;

    // Manages the tracking and generation of sync-points, mappings
    // between a time in the display time and a segment index within
    // a playlist
    _this.syncController_ = settings.syncController;
    _this.syncPoint_ = {
      segmentIndex: 0,
      time: 0
    };

    _this.syncController_.on('syncinfoupdate', function () {
      return _this.trigger('syncinfoupdate');
    });

    _this.mediaSource_.addEventListener('sourceopen', function () {
      return _this.ended_ = false;
    });

    // ...for determining the fetch location
    _this.fetchAtBuffer_ = false;

    _this.logger_ = logger('SegmentLoader[' + _this.loaderType_ + ']');

    Object.defineProperty(_this, 'state', {
      get: function get$$1() {
        return this.state_;
      },
      set: function set$$1(newState) {
        if (newState !== this.state_) {
          this.logger_(this.state_ + ' -> ' + newState);
          this.state_ = newState;
        }
      }
    });
    return _this;
  }

  /**
   * reset all of our media stats
   *
   * @private
   */


  createClass(SegmentLoader, [{
    key: 'resetStats_',
    value: function resetStats_() {
      this.mediaBytesTransferred = 0;
      this.mediaRequests = 0;
      this.mediaRequestsAborted = 0;
      this.mediaRequestsTimedout = 0;
      this.mediaRequestsErrored = 0;
      this.mediaTransferDuration = 0;
      this.mediaSecondsLoaded = 0;
    }

    /**
     * dispose of the SegmentLoader and reset to the default state
     */

  }, {
    key: 'dispose',
    value: function dispose() {
      this.state = 'DISPOSED';
      this.pause();
      this.abort_();
      if (this.sourceUpdater_) {
        this.sourceUpdater_.dispose();
      }
      this.resetStats_();
      if (this.captionParser_) {
        this.captionParser_.reset();
      }
    }

    /**
     * abort anything that is currently doing on with the SegmentLoader
     * and reset to a default state
     */

  }, {
    key: 'abort',
    value: function abort() {
      if (this.state !== 'WAITING') {
        if (this.pendingSegment_) {
          this.pendingSegment_ = null;
        }
        return;
      }

      this.abort_();

      // We aborted the requests we were waiting on, so reset the loader's state to READY
      // since we are no longer "waiting" on any requests. XHR callback is not always run
      // when the request is aborted. This will prevent the loader from being stuck in the
      // WAITING state indefinitely.
      this.state = 'READY';

      // don't wait for buffer check timeouts to begin fetching the
      // next segment
      if (!this.paused()) {
        this.monitorBuffer_();
      }
    }

    /**
     * abort all pending xhr requests and null any pending segements
     *
     * @private
     */

  }, {
    key: 'abort_',
    value: function abort_() {
      if (this.pendingSegment_) {
        this.pendingSegment_.abortRequests();
      }

      // clear out the segment being processed
      this.pendingSegment_ = null;
    }

    /**
     * set an error on the segment loader and null out any pending segements
     *
     * @param {Error} error the error to set on the SegmentLoader
     * @return {Error} the error that was set or that is currently set
     */

  }, {
    key: 'error',
    value: function error(_error) {
      if (typeof _error !== 'undefined') {
        this.error_ = _error;
      }

      this.pendingSegment_ = null;
      return this.error_;
    }
  }, {
    key: 'endOfStream',
    value: function endOfStream() {
      this.ended_ = true;
      this.pause();
      this.trigger('ended');
    }

    /**
     * Indicates which time ranges are buffered
     *
     * @return {TimeRange}
     *         TimeRange object representing the current buffered ranges
     */

  }, {
    key: 'buffered_',
    value: function buffered_() {
      if (!this.sourceUpdater_) {
        return videojs.createTimeRanges();
      }

      return this.sourceUpdater_.buffered();
    }

    /**
     * Gets and sets init segment for the provided map
     *
     * @param {Object} map
     *        The map object representing the init segment to get or set
     * @param {Boolean=} set
     *        If true, the init segment for the provided map should be saved
     * @return {Object}
     *         map object for desired init segment
     */

  }, {
    key: 'initSegment',
    value: function initSegment(map) {
      var set$$1 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

      if (!map) {
        return null;
      }

      var id = initSegmentId(map);
      var storedMap = this.initSegments_[id];

      if (set$$1 && !storedMap && map.bytes) {
        this.initSegments_[id] = storedMap = {
          resolvedUri: map.resolvedUri,
          byterange: map.byterange,
          bytes: map.bytes,
          timescales: map.timescales,
          videoTrackIds: map.videoTrackIds
        };
      }

      return storedMap || map;
    }

    /**
     * Gets and sets key for the provided key
     *
     * @param {Object} key
     *        The key object representing the key to get or set
     * @param {Boolean=} set
     *        If true, the key for the provided key should be saved
     * @return {Object}
     *         Key object for desired key
     */

  }, {
    key: 'segmentKey',
    value: function segmentKey(key) {
      var set$$1 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

      if (!key) {
        return null;
      }

      var id = segmentKeyId(key);
      var storedKey = this.keyCache_[id];

      // TODO: We should use the HTTP Expires header to invalidate our cache per
      // https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-6.2.3
      if (this.cacheEncryptionKeys_ && set$$1 && !storedKey && key.bytes) {
        this.keyCache_[id] = storedKey = {
          resolvedUri: key.resolvedUri,
          bytes: key.bytes
        };
      }

      var result = {
        resolvedUri: (storedKey || key).resolvedUri
      };

      if (storedKey) {
        result.bytes = storedKey.bytes;
      }

      return result;
    }

    /**
     * Returns true if all configuration required for loading is present, otherwise false.
     *
     * @return {Boolean} True if the all configuration is ready for loading
     * @private
     */

  }, {
    key: 'couldBeginLoading_',
    value: function couldBeginLoading_() {
      return this.playlist_ && (
      // the source updater is created when init_ is called, so either having a
      // source updater or being in the INIT state with a mimeType is enough
      // to say we have all the needed configuration to start loading.
      this.sourceUpdater_ || this.mimeType_ && this.state === 'INIT') && !this.paused();
    }

    /**
     * load a playlist and start to fill the buffer
     */

  }, {
    key: 'load',
    value: function load() {
      // un-pause
      this.monitorBuffer_();

      // if we don't have a playlist yet, keep waiting for one to be
      // specified
      if (!this.playlist_) {
        return;
      }

      // not sure if this is the best place for this
      this.syncController_.setDateTimeMapping(this.playlist_);

      // if all the configuration is ready, initialize and begin loading
      if (this.state === 'INIT' && this.couldBeginLoading_()) {
        return this.init_();
      }

      // if we're in the middle of processing a segment already, don't
      // kick off an additional segment request
      if (!this.couldBeginLoading_() || this.state !== 'READY' && this.state !== 'INIT') {
        return;
      }

      this.state = 'READY';
    }

    /**
     * Once all the starting parameters have been specified, begin
     * operation. This method should only be invoked from the INIT
     * state.
     *
     * @private
     */

  }, {
    key: 'init_',
    value: function init_() {
      this.state = 'READY';
      this.sourceUpdater_ = new SourceUpdater(this.mediaSource_, this.mimeType_, this.loaderType_, this.sourceBufferEmitter_);
      this.resetEverything();
      return this.monitorBuffer_();
    }

    /**
     * set a playlist on the segment loader
     *
     * @param {PlaylistLoader} media the playlist to set on the segment loader
     */

  }, {
    key: 'playlist',
    value: function playlist(newPlaylist) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

      if (!newPlaylist) {
        return;
      }

      var oldPlaylist = this.playlist_;
      var segmentInfo = this.pendingSegment_;

      this.playlist_ = newPlaylist;
      this.xhrOptions_ = options;

      // when we haven't started playing yet, the start of a live playlist
      // is always our zero-time so force a sync update each time the playlist
      // is refreshed from the server
      if (!this.hasPlayed_()) {
        newPlaylist.syncInfo = {
          mediaSequence: newPlaylist.mediaSequence,
          time: 0
        };
      }

      var oldId = null;

      if (oldPlaylist) {
        if (oldPlaylist.id) {
          oldId = oldPlaylist.id;
        } else if (oldPlaylist.uri) {
          oldId = oldPlaylist.uri;
        }
      }

      this.logger_('playlist update [' + oldId + ' => ' + (newPlaylist.id || newPlaylist.uri) + ']');

      // in VOD, this is always a rendition switch (or we updated our syncInfo above)
      // in LIVE, we always want to update with new playlists (including refreshes)
      this.trigger('syncinfoupdate');

      // if we were unpaused but waiting for a playlist, start
      // buffering now
      if (this.state === 'INIT' && this.couldBeginLoading_()) {
        return this.init_();
      }

      if (!oldPlaylist || oldPlaylist.uri !== newPlaylist.uri) {
        if (this.mediaIndex !== null) {
          // we must "resync" the segment loader when we switch renditions and
          // the segment loader is already synced to the previous rendition
          this.resyncLoader();
        }

        // the rest of this function depends on `oldPlaylist` being defined
        return;
      }

      // we reloaded the same playlist so we are in a live scenario
      // and we will likely need to adjust the mediaIndex
      var mediaSequenceDiff = newPlaylist.mediaSequence - oldPlaylist.mediaSequence;

      this.logger_('live window shift [' + mediaSequenceDiff + ']');

      // update the mediaIndex on the SegmentLoader
      // this is important because we can abort a request and this value must be
      // equal to the last appended mediaIndex
      if (this.mediaIndex !== null) {
        this.mediaIndex -= mediaSequenceDiff;
      }

      // update the mediaIndex on the SegmentInfo object
      // this is important because we will update this.mediaIndex with this value
      // in `handleUpdateEnd_` after the segment has been successfully appended
      if (segmentInfo) {
        segmentInfo.mediaIndex -= mediaSequenceDiff;

        // we need to update the referenced segment so that timing information is
        // saved for the new playlist's segment, however, if the segment fell off the
        // playlist, we can leave the old reference and just lose the timing info
        if (segmentInfo.mediaIndex >= 0) {
          segmentInfo.segment = newPlaylist.segments[segmentInfo.mediaIndex];
        }
      }

      this.syncController_.saveExpiredSegmentInfo(oldPlaylist, newPlaylist);
    }

    /**
     * Prevent the loader from fetching additional segments. If there
     * is a segment request outstanding, it will finish processing
     * before the loader halts. A segment loader can be unpaused by
     * calling load().
     */

  }, {
    key: 'pause',
    value: function pause() {
      if (this.checkBufferTimeout_) {
        window$1.clearTimeout(this.checkBufferTimeout_);

        this.checkBufferTimeout_ = null;
      }
    }

    /**
     * Returns whether the segment loader is fetching additional
     * segments when given the opportunity. This property can be
     * modified through calls to pause() and load().
     */

  }, {
    key: 'paused',
    value: function paused() {
      return this.checkBufferTimeout_ === null;
    }

    /**
     * create/set the following mimetype on the SourceBuffer through a
     * SourceUpdater
     *
     * @param {String} mimeType the mime type string to use
     * @param {Object} sourceBufferEmitter an event emitter that fires when a source buffer
     * is added to the media source
     */

  }, {
    key: 'mimeType',
    value: function mimeType(_mimeType, sourceBufferEmitter) {
      if (this.mimeType_) {
        return;
      }

      this.mimeType_ = _mimeType;
      this.sourceBufferEmitter_ = sourceBufferEmitter;
      // if we were unpaused but waiting for a sourceUpdater, start
      // buffering now
      if (this.state === 'INIT' && this.couldBeginLoading_()) {
        this.init_();
      }
    }

    /**
     * Delete all the buffered data and reset the SegmentLoader
     * @param {Function} [done] an optional callback to be executed when the remove
     * operation is complete
     */

  }, {
    key: 'resetEverything',
    value: function resetEverything(done) {
      this.ended_ = false;
      this.resetLoader();
      this.remove(0, this.duration_(), done);
      // clears fmp4 captions
      if (this.captionParser_) {
        this.captionParser_.clearAllCaptions();
      }
      this.trigger('reseteverything');
    }

    /**
     * Force the SegmentLoader to resync and start loading around the currentTime instead
     * of starting at the end of the buffer
     *
     * Useful for fast quality changes
     */

  }, {
    key: 'resetLoader',
    value: function resetLoader() {
      this.fetchAtBuffer_ = false;
      this.resyncLoader();
    }

    /**
     * Force the SegmentLoader to restart synchronization and make a conservative guess
     * before returning to the simple walk-forward method
     */

  }, {
    key: 'resyncLoader',
    value: function resyncLoader() {
      this.mediaIndex = null;
      this.syncPoint_ = null;
      this.abort();
    }

    /**
     * Remove any data in the source buffer between start and end times
     * @param {Number} start - the start time of the region to remove from the buffer
     * @param {Number} end - the end time of the region to remove from the buffer
     * @param {Function} [done] - an optional callback to be executed when the remove
     * operation is complete
     */

  }, {
    key: 'remove',
    value: function remove(start, end, done) {
      if (this.sourceUpdater_) {
        this.sourceUpdater_.remove(start, end, done);
      }
      removeCuesFromTrack(start, end, this.segmentMetadataTrack_);

      if (this.inbandTextTracks_) {
        for (var id in this.inbandTextTracks_) {
          removeCuesFromTrack(start, end, this.inbandTextTracks_[id]);
        }
      }
    }

    /**
     * (re-)schedule monitorBufferTick_ to run as soon as possible
     *
     * @private
     */

  }, {
    key: 'monitorBuffer_',
    value: function monitorBuffer_() {
      if (this.checkBufferTimeout_) {
        window$1.clearTimeout(this.checkBufferTimeout_);
      }

      this.checkBufferTimeout_ = window$1.setTimeout(this.monitorBufferTick_.bind(this), 1);
    }

    /**
     * As long as the SegmentLoader is in the READY state, periodically
     * invoke fillBuffer_().
     *
     * @private
     */

  }, {
    key: 'monitorBufferTick_',
    value: function monitorBufferTick_() {
      if (this.state === 'READY') {
        this.fillBuffer_();
      }

      if (this.checkBufferTimeout_) {
        window$1.clearTimeout(this.checkBufferTimeout_);
      }

      this.checkBufferTimeout_ = window$1.setTimeout(this.monitorBufferTick_.bind(this), CHECK_BUFFER_DELAY);
    }

    /**
     * fill the buffer with segements unless the sourceBuffers are
     * currently updating
     *
     * Note: this function should only ever be called by monitorBuffer_
     * and never directly
     *
     * @private
     */

  }, {
    key: 'fillBuffer_',
    value: function fillBuffer_() {
      if (this.sourceUpdater_.updating()) {
        return;
      }

      if (!this.syncPoint_) {
        this.syncPoint_ = this.syncController_.getSyncPoint(this.playlist_, this.duration_(), this.currentTimeline_, this.currentTime_());
      }

      // see if we need to begin loading immediately
      var segmentInfo = this.checkBuffer_(this.buffered_(), this.playlist_, this.mediaIndex, this.hasPlayed_(), this.currentTime_(), this.syncPoint_);

      if (!segmentInfo) {
        return;
      }

      if (this.isEndOfStream_(segmentInfo.mediaIndex)) {
        this.endOfStream();
        return;
      }

      if (segmentInfo.mediaIndex === this.playlist_.segments.length - 1 && this.mediaSource_.readyState === 'ended' && !this.seeking_()) {
        return;
      }

      // We will need to change timestampOffset of the sourceBuffer if:
      // - The segment.timeline !== this.currentTimeline
      //   (we are crossing a discontinuity somehow)
      // - The "timestampOffset" for the start of this segment is less than
      //   the currently set timestampOffset
      // Also, clear captions if we are crossing a discontinuity boundary
      // Previously, we changed the timestampOffset if the start of this segment
      // is less than the currently set timestampOffset but this isn't wanted
      // as it can produce bad behavior, especially around long running
      // live streams
      if (segmentInfo.timeline !== this.currentTimeline_) {
        this.syncController_.reset();
        segmentInfo.timestampOffset = segmentInfo.startOfSegment;
        if (this.captionParser_) {
          this.captionParser_.clearAllCaptions();
        }
      }

      this.loadSegment_(segmentInfo);
    }

    /**
     * Determines if this segment loader is at the end of it's stream.
     *
     * @param {Number} mediaIndex the index of segment we last appended
     * @param {Object} [playlist=this.playlist_] a media playlist object
     * @returns {Boolean} true if at end of stream, false otherwise.
     */

  }, {
    key: 'isEndOfStream_',
    value: function isEndOfStream_(mediaIndex) {
      var playlist = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : this.playlist_;

      return detectEndOfStream(playlist, this.mediaSource_, mediaIndex) && !this.sourceUpdater_.updating();
    }

    /**
     * Determines what segment request should be made, given current playback
     * state.
     *
     * @param {TimeRanges} buffered - the state of the buffer
     * @param {Object} playlist - the playlist object to fetch segments from
     * @param {Number} mediaIndex - the previous mediaIndex fetched or null
     * @param {Boolean} hasPlayed - a flag indicating whether we have played or not
     * @param {Number} currentTime - the playback position in seconds
     * @param {Object} syncPoint - a segment info object that describes the
     * @returns {Object} a segment request object that describes the segment to load
     */

  }, {
    key: 'checkBuffer_',
    value: function checkBuffer_(buffered, playlist, mediaIndex, hasPlayed, currentTime, syncPoint) {
      var lastBufferedEnd = 0;
      var startOfSegment = void 0;

      if (buffered.length) {
        lastBufferedEnd = buffered.end(buffered.length - 1);
      }

      var bufferedTime = Math.max(0, lastBufferedEnd - currentTime);

      if (!playlist.segments.length) {
        return null;
      }

      // if there is plenty of content buffered, and the video has
      // been played before relax for awhile
      if (bufferedTime >= this.goalBufferLength_()) {
        return null;
      }

      // if the video has not yet played once, and we already have
      // one segment downloaded do nothing
      if (!hasPlayed && bufferedTime >= 1) {
        return null;
      }

      // When the syncPoint is null, there is no way of determining a good
      // conservative segment index to fetch from
      // The best thing to do here is to get the kind of sync-point data by
      // making a request
      if (syncPoint === null) {
        mediaIndex = this.getSyncSegmentCandidate_(playlist);
        return this.generateSegmentInfo_(playlist, mediaIndex, null, true);
      }

      // Under normal playback conditions fetching is a simple walk forward
      if (mediaIndex !== null) {
        var segment = playlist.segments[mediaIndex];

        startOfSegment = lastBufferedEnd;

        return this.generateSegmentInfo_(playlist, mediaIndex + 1, startOfSegment, false);
      }

      // There is a sync-point but the lack of a mediaIndex indicates that
      // we need to make a good conservative guess about which segment to
      // fetch
      if (this.fetchAtBuffer_) {
        // Find the segment containing the end of the buffer
        var mediaSourceInfo = Playlist.getMediaInfoForTime(playlist, lastBufferedEnd, syncPoint.segmentIndex, syncPoint.time);

        mediaIndex = mediaSourceInfo.mediaIndex;
        startOfSegment = mediaSourceInfo.startTime;
      } else {
        // Find the segment containing currentTime
        var _mediaSourceInfo = Playlist.getMediaInfoForTime(playlist, currentTime, syncPoint.segmentIndex, syncPoint.time);

        mediaIndex = _mediaSourceInfo.mediaIndex;
        startOfSegment = _mediaSourceInfo.startTime;
      }

      return this.generateSegmentInfo_(playlist, mediaIndex, startOfSegment, false);
    }

    /**
     * The segment loader has no recourse except to fetch a segment in the
     * current playlist and use the internal timestamps in that segment to
     * generate a syncPoint. This function returns a good candidate index
     * for that process.
     *
     * @param {Object} playlist - the playlist object to look for a
     * @returns {Number} An index of a segment from the playlist to load
     */

  }, {
    key: 'getSyncSegmentCandidate_',
    value: function getSyncSegmentCandidate_(playlist) {
      var _this2 = this;

      if (this.currentTimeline_ === -1) {
        return 0;
      }

      var segmentIndexArray = playlist.segments.map(function (s, i) {
        return {
          timeline: s.timeline,
          segmentIndex: i
        };
      }).filter(function (s) {
        return s.timeline === _this2.currentTimeline_;
      });

      if (segmentIndexArray.length) {
        return segmentIndexArray[Math.min(segmentIndexArray.length - 1, 1)].segmentIndex;
      }

      return Math.max(playlist.segments.length - 1, 0);
    }
  }, {
    key: 'generateSegmentInfo_',
    value: function generateSegmentInfo_(playlist, mediaIndex, startOfSegment, isSyncRequest) {
      if (mediaIndex < 0 || mediaIndex >= playlist.segments.length) {
        return null;
      }

      var segment = playlist.segments[mediaIndex];

      return {
        requestId: 'segment-loader-' + Math.random(),
        // resolve the segment URL relative to the playlist
        uri: segment.resolvedUri,
        // the segment's mediaIndex at the time it was requested
        mediaIndex: mediaIndex,
        // whether or not to update the SegmentLoader's state with this
        // segment's mediaIndex
        isSyncRequest: isSyncRequest,
        startOfSegment: startOfSegment,
        // the segment's playlist
        playlist: playlist,
        // unencrypted bytes of the segment
        bytes: null,
        // when a key is defined for this segment, the encrypted bytes
        encryptedBytes: null,
        // The target timestampOffset for this segment when we append it
        // to the source buffer
        timestampOffset: null,
        // The timeline that the segment is in
        timeline: segment.timeline,
        // The expected duration of the segment in seconds
        duration: segment.duration,
        // retain the segment in case the playlist updates while doing an async process
        segment: segment
      };
    }

    /**
     * Determines if the network has enough bandwidth to complete the current segment
     * request in a timely manner. If not, the request will be aborted early and bandwidth
     * updated to trigger a playlist switch.
     *
     * @param {Object} stats
     *        Object containing stats about the request timing and size
     * @return {Boolean} True if the request was aborted, false otherwise
     * @private
     */

  }, {
    key: 'abortRequestEarly_',
    value: function abortRequestEarly_(stats) {
      if (this.hls_.tech_.paused() ||
      // Don't abort if the current playlist is on the lowestEnabledRendition
      // TODO: Replace using timeout with a boolean indicating whether this playlist is
      //       the lowestEnabledRendition.
      !this.xhrOptions_.timeout ||
      // Don't abort if we have no bandwidth information to estimate segment sizes
      !this.playlist_.attributes.BANDWIDTH) {
        return false;
      }

      // Wait at least 1 second since the first byte of data has been received before
      // using the calculated bandwidth from the progress event to allow the bitrate
      // to stabilize
      if (Date.now() - (stats.firstBytesReceivedAt || Date.now()) < 1000) {
        return false;
      }

      var currentTime = this.currentTime_();
      var measuredBandwidth = stats.bandwidth;
      var segmentDuration = this.pendingSegment_.duration;

      var requestTimeRemaining = Playlist.estimateSegmentRequestTime(segmentDuration, measuredBandwidth, this.playlist_, stats.bytesReceived);

      // Subtract 1 from the timeUntilRebuffer so we still consider an early abort
      // if we are only left with less than 1 second when the request completes.
      // A negative timeUntilRebuffering indicates we are already rebuffering
      var timeUntilRebuffer$$1 = timeUntilRebuffer(this.buffered_(), currentTime, this.hls_.tech_.playbackRate()) - 1;

      // Only consider aborting early if the estimated time to finish the download
      // is larger than the estimated time until the player runs out of forward buffer
      if (requestTimeRemaining <= timeUntilRebuffer$$1) {
        return false;
      }

      var switchCandidate = minRebufferMaxBandwidthSelector({
        master: this.hls_.playlists.master,
        currentTime: currentTime,
        bandwidth: measuredBandwidth,
        duration: this.duration_(),
        segmentDuration: segmentDuration,
        timeUntilRebuffer: timeUntilRebuffer$$1,
        currentTimeline: this.currentTimeline_,
        syncController: this.syncController_
      });

      if (!switchCandidate) {
        return;
      }

      var rebufferingImpact = requestTimeRemaining - timeUntilRebuffer$$1;

      var timeSavedBySwitching = rebufferingImpact - switchCandidate.rebufferingImpact;

      var minimumTimeSaving = 0.5;

      // If we are already rebuffering, increase the amount of variance we add to the
      // potential round trip time of the new request so that we are not too aggressive
      // with switching to a playlist that might save us a fraction of a second.
      if (timeUntilRebuffer$$1 <= TIME_FUDGE_FACTOR) {
        minimumTimeSaving = 1;
      }

      if (!switchCandidate.playlist || switchCandidate.playlist.uri === this.playlist_.uri || timeSavedBySwitching < minimumTimeSaving) {
        return false;
      }

      // set the bandwidth to that of the desired playlist being sure to scale by
      // BANDWIDTH_VARIANCE and add one so the playlist selector does not exclude it
      // don't trigger a bandwidthupdate as the bandwidth is artifial
      this.bandwidth = switchCandidate.playlist.attributes.BANDWIDTH * Config.BANDWIDTH_VARIANCE + 1;
      this.abort();
      this.trigger('earlyabort');
      return true;
    }

    /**
     * XHR `progress` event handler
     *
     * @param {Event}
     *        The XHR `progress` event
     * @param {Object} simpleSegment
     *        A simplified segment object copy
     * @private
     */

  }, {
    key: 'handleProgress_',
    value: function handleProgress_(event, simpleSegment) {
      if (!this.pendingSegment_ || simpleSegment.requestId !== this.pendingSegment_.requestId || this.abortRequestEarly_(simpleSegment.stats)) {
        return;
      }

      this.trigger('progress');
    }

    /**
     * load a specific segment from a request into the buffer
     *
     * @private
     */

  }, {
    key: 'loadSegment_',
    value: function loadSegment_(segmentInfo) {
      this.state = 'WAITING';
      this.pendingSegment_ = segmentInfo;
      this.trimBackBuffer_(segmentInfo);

      segmentInfo.abortRequests = mediaSegmentRequest(this.hls_.xhr, this.xhrOptions_, this.decrypter_, this.captionParser_, this.createSimplifiedSegmentObj_(segmentInfo),
      // progress callback
      this.handleProgress_.bind(this), this.segmentRequestFinished_.bind(this));
    }

    /**
     * trim the back buffer so that we don't have too much data
     * in the source buffer
     *
     * @private
     *
     * @param {Object} segmentInfo - the current segment
     */

  }, {
    key: 'trimBackBuffer_',
    value: function trimBackBuffer_(segmentInfo) {
      var removeToTime = safeBackBufferTrimTime(this.seekable_(), this.currentTime_(), this.playlist_.targetDuration || 10);

      // Chrome has a hard limit of 150MB of
      // buffer and a very conservative "garbage collector"
      // We manually clear out the old buffer to ensure
      // we don't trigger the QuotaExceeded error
      // on the source buffer during subsequent appends

      if (removeToTime > 0) {
        this.remove(0, removeToTime);
      }
    }

    /**
     * created a simplified copy of the segment object with just the
     * information necessary to perform the XHR and decryption
     *
     * @private
     *
     * @param {Object} segmentInfo - the current segment
     * @returns {Object} a simplified segment object copy
     */

  }, {
    key: 'createSimplifiedSegmentObj_',
    value: function createSimplifiedSegmentObj_(segmentInfo) {
      var segment = segmentInfo.segment;
      var simpleSegment = {
        resolvedUri: segment.resolvedUri,
        byterange: segment.byterange,
        requestId: segmentInfo.requestId
      };

      if (segment.key) {
        // if the media sequence is greater than 2^32, the IV will be incorrect
        // assuming 10s segments, that would be about 1300 years
        var iv = segment.key.iv || new Uint32Array([0, 0, 0, segmentInfo.mediaIndex + segmentInfo.playlist.mediaSequence]);

        simpleSegment.key = this.segmentKey(segment.key);
        simpleSegment.key.iv = iv;
      }

      if (segment.map) {
        simpleSegment.map = this.initSegment(segment.map);
      }

      return simpleSegment;
    }

    /**
     * Handle the callback from the segmentRequest function and set the
     * associated SegmentLoader state and errors if necessary
     *
     * @private
     */

  }, {
    key: 'segmentRequestFinished_',
    value: function segmentRequestFinished_(error, simpleSegment) {
      // every request counts as a media request even if it has been aborted
      // or canceled due to a timeout
      this.mediaRequests += 1;

      if (simpleSegment.stats) {
        this.mediaBytesTransferred += simpleSegment.stats.bytesReceived;
        this.mediaTransferDuration += simpleSegment.stats.roundTripTime;
      }

      // The request was aborted and the SegmentLoader has already been reset
      if (!this.pendingSegment_) {
        this.mediaRequestsAborted += 1;
        return;
      }

      // the request was aborted and the SegmentLoader has already started
      // another request. this can happen when the timeout for an aborted
      // request triggers due to a limitation in the XHR library
      // do not count this as any sort of request or we risk double-counting
      if (simpleSegment.requestId !== this.pendingSegment_.requestId) {
        return;
      }

      // an error occurred from the active pendingSegment_ so reset everything
      if (error) {
        this.pendingSegment_ = null;
        this.state = 'READY';

        // the requests were aborted just record the aborted stat and exit
        // this is not a true error condition and nothing corrective needs
        // to be done
        if (error.code === REQUEST_ERRORS.ABORTED) {
          this.mediaRequestsAborted += 1;
          return;
        }

        this.pause();

        // the error is really just that at least one of the requests timed-out
        // set the bandwidth to a very low value and trigger an ABR switch to
        // take emergency action
        if (error.code === REQUEST_ERRORS.TIMEOUT) {
          this.mediaRequestsTimedout += 1;
          this.bandwidth = 1;
          this.roundTrip = NaN;
          this.trigger('bandwidthupdate');
          return;
        }

        // if control-flow has arrived here, then the error is real
        // emit an error event to blacklist the current playlist
        this.mediaRequestsErrored += 1;
        this.error(error);
        this.trigger('error');
        return;
      }

      // the response was a success so set any bandwidth stats the request
      // generated for ABR purposes
      this.bandwidth = simpleSegment.stats.bandwidth;
      this.roundTrip = simpleSegment.stats.roundTripTime;

      // if this request included an initialization segment, save that data
      // to the initSegment cache
      if (simpleSegment.map) {
        simpleSegment.map = this.initSegment(simpleSegment.map, true);
      }

      // if this request included a segment key, save that data in the cache
      if (simpleSegment.key) {
        this.segmentKey(simpleSegment.key, true);
      }

      this.processSegmentResponse_(simpleSegment);
    }

    /**
     * Move any important data from the simplified segment object
     * back to the real segment object for future phases
     *
     * @private
     */

  }, {
    key: 'processSegmentResponse_',
    value: function processSegmentResponse_(simpleSegment) {
      var segmentInfo = this.pendingSegment_;

      segmentInfo.bytes = simpleSegment.bytes;
      if (simpleSegment.map) {
        segmentInfo.segment.map.bytes = simpleSegment.map.bytes;
      }

      segmentInfo.endOfAllRequests = simpleSegment.endOfAllRequests;

      // This has fmp4 captions, add them to text tracks
      if (simpleSegment.fmp4Captions) {
        createCaptionsTrackIfNotExists(this.inbandTextTracks_, this.hls_.tech_, simpleSegment.captionStreams);
        addCaptionData({
          inbandTextTracks: this.inbandTextTracks_,
          captionArray: simpleSegment.fmp4Captions,
          // fmp4s will not have a timestamp offset
          timestampOffset: 0
        });
        // Reset stored captions since we added parsed
        // captions to a text track at this point
        if (this.captionParser_) {
          this.captionParser_.clearParsedCaptions();
        }
      }

      this.handleSegment_();
    }

    /**
     * append a decrypted segement to the SourceBuffer through a SourceUpdater
     *
     * @private
     */

  }, {
    key: 'handleSegment_',
    value: function handleSegment_() {
      var _this3 = this;

      if (!this.pendingSegment_) {
        this.state = 'READY';
        return;
      }

      var segmentInfo = this.pendingSegment_;
      var segment = segmentInfo.segment;
      var timingInfo = this.syncController_.probeSegmentInfo(segmentInfo);

      // When we have our first timing info, determine what media types this loader is
      // dealing with. Although we're maintaining extra state, it helps to preserve the
      // separation of segment loader from the actual source buffers.
      if (typeof this.startingMedia_ === 'undefined' && timingInfo && (
      // Guard against cases where we're not getting timing info at all until we are
      // certain that all streams will provide it.
      timingInfo.containsAudio || timingInfo.containsVideo)) {
        this.startingMedia_ = {
          containsAudio: timingInfo.containsAudio,
          containsVideo: timingInfo.containsVideo
        };
      }

      var illegalMediaSwitchError = illegalMediaSwitch(this.loaderType_, this.startingMedia_, timingInfo);

      if (illegalMediaSwitchError) {
        this.error({
          message: illegalMediaSwitchError,
          blacklistDuration: Infinity
        });
        this.trigger('error');
        return;
      }

      if (segmentInfo.isSyncRequest) {
        this.trigger('syncinfoupdate');
        this.pendingSegment_ = null;
        this.state = 'READY';
        return;
      }

      if (segmentInfo.timestampOffset !== null && segmentInfo.timestampOffset !== this.sourceUpdater_.timestampOffset()) {

        // Subtract any difference between the PTS and DTS times of the first frame
        // from the timeStampOffset (which currently equals the buffered.end) to prevent
        // creating any gaps in the buffer
        if (timingInfo && timingInfo.segmentTimestampInfo) {
          var ptsStartTime = timingInfo.segmentTimestampInfo[0].ptsTime;
          var dtsStartTime = timingInfo.segmentTimestampInfo[0].dtsTime;

          segmentInfo.timestampOffset -= ptsStartTime - dtsStartTime;
        }

        this.sourceUpdater_.timestampOffset(segmentInfo.timestampOffset);
        // fired when a timestamp offset is set in HLS (can also identify discontinuities)
        this.trigger('timestampoffset');
      }

      var timelineMapping = this.syncController_.mappingForTimeline(segmentInfo.timeline);

      if (timelineMapping !== null) {
        this.trigger({
          type: 'segmenttimemapping',
          mapping: timelineMapping
        });
      }

      this.state = 'APPENDING';

      // if the media initialization segment is changing, append it
      // before the content segment
      if (segment.map) {
        var initId = initSegmentId(segment.map);

        if (!this.activeInitSegmentId_ || this.activeInitSegmentId_ !== initId) {
          var initSegment = this.initSegment(segment.map);

          this.sourceUpdater_.appendBuffer({
            bytes: initSegment.bytes
          }, function () {
            _this3.activeInitSegmentId_ = initId;
          });
        }
      }

      segmentInfo.byteLength = segmentInfo.bytes.byteLength;
      if (typeof segment.start === 'number' && typeof segment.end === 'number') {
        this.mediaSecondsLoaded += segment.end - segment.start;
      } else {
        this.mediaSecondsLoaded += segment.duration;
      }

      this.logger_(segmentInfoString(segmentInfo));

      this.sourceUpdater_.appendBuffer({
        bytes: segmentInfo.bytes,
        videoSegmentTimingInfoCallback: this.handleVideoSegmentTimingInfo_.bind(this, segmentInfo.requestId)
      }, this.handleUpdateEnd_.bind(this));
    }
  }, {
    key: 'handleVideoSegmentTimingInfo_',
    value: function handleVideoSegmentTimingInfo_(requestId, event) {
      if (!this.pendingSegment_ || requestId !== this.pendingSegment_.requestId) {
        return;
      }

      var segment = this.pendingSegment_.segment;

      if (!segment.videoTimingInfo) {
        segment.videoTimingInfo = {};
      }

      segment.videoTimingInfo.transmuxerPrependedSeconds = event.videoSegmentTimingInfo.prependedContentDuration || 0;
      segment.videoTimingInfo.transmuxedPresentationStart = event.videoSegmentTimingInfo.start.presentation;
      segment.videoTimingInfo.transmuxedPresentationEnd = event.videoSegmentTimingInfo.end.presentation;
      // mainly used as a reference for debugging
      segment.videoTimingInfo.baseMediaDecodeTime = event.videoSegmentTimingInfo.baseMediaDecodeTime;
    }

    /**
     * callback to run when appendBuffer is finished. detects if we are
     * in a good state to do things with the data we got, or if we need
     * to wait for more
     *
     * @private
     */

  }, {
    key: 'handleUpdateEnd_',
    value: function handleUpdateEnd_() {
      if (!this.pendingSegment_) {
        this.state = 'READY';
        if (!this.paused()) {
          this.monitorBuffer_();
        }
        return;
      }

      var segmentInfo = this.pendingSegment_;
      var segment = segmentInfo.segment;
      var isWalkingForward = this.mediaIndex !== null;

      this.pendingSegment_ = null;
      this.recordThroughput_(segmentInfo);
      this.addSegmentMetadataCue_(segmentInfo);

      this.state = 'READY';

      this.mediaIndex = segmentInfo.mediaIndex;
      this.fetchAtBuffer_ = true;
      this.currentTimeline_ = segmentInfo.timeline;

      // We must update the syncinfo to recalculate the seekable range before
      // the following conditional otherwise it may consider this a bad "guess"
      // and attempt to resync when the post-update seekable window and live
      // point would mean that this was the perfect segment to fetch
      this.trigger('syncinfoupdate');

      // If we previously appended a segment that ends more than 3 targetDurations before
      // the currentTime_ that means that our conservative guess was too conservative.
      // In that case, reset the loader state so that we try to use any information gained
      // from the previous request to create a new, more accurate, sync-point.
      if (segment.end && this.currentTime_() - segment.end > segmentInfo.playlist.targetDuration * 3) {
        this.resetEverything();
        return;
      }

      // Don't do a rendition switch unless we have enough time to get a sync segment
      // and conservatively guess
      if (isWalkingForward) {
        this.trigger('bandwidthupdate');
      }
      this.trigger('progress');

      // any time an update finishes and the last segment is in the
      // buffer, end the stream. this ensures the "ended" event will
      // fire if playback reaches that point.
      if (this.isEndOfStream_(segmentInfo.mediaIndex + 1, segmentInfo.playlist)) {
        this.endOfStream();
      }

      if (!this.paused()) {
        this.monitorBuffer_();
      }
    }

    /**
     * Records the current throughput of the decrypt, transmux, and append
     * portion of the semgment pipeline. `throughput.rate` is a the cumulative
     * moving average of the throughput. `throughput.count` is the number of
     * data points in the average.
     *
     * @private
     * @param {Object} segmentInfo the object returned by loadSegment
     */

  }, {
    key: 'recordThroughput_',
    value: function recordThroughput_(segmentInfo) {
      var rate = this.throughput.rate;
      // Add one to the time to ensure that we don't accidentally attempt to divide
      // by zero in the case where the throughput is ridiculously high
      var segmentProcessingTime = Date.now() - segmentInfo.endOfAllRequests + 1;
      // Multiply by 8000 to convert from bytes/millisecond to bits/second
      var segmentProcessingThroughput = Math.floor(segmentInfo.byteLength / segmentProcessingTime * 8 * 1000);

      // This is just a cumulative moving average calculation:
      //   newAvg = oldAvg + (sample - oldAvg) / (sampleCount + 1)
      this.throughput.rate += (segmentProcessingThroughput - rate) / ++this.throughput.count;
    }

    /**
     * Adds a cue to the segment-metadata track with some metadata information about the
     * segment
     *
     * @private
     * @param {Object} segmentInfo
     *        the object returned by loadSegment
     * @method addSegmentMetadataCue_
     */

  }, {
    key: 'addSegmentMetadataCue_',
    value: function addSegmentMetadataCue_(segmentInfo) {
      if (!this.segmentMetadataTrack_) {
        return;
      }

      var segment = segmentInfo.segment;
      var start = segment.start;
      var end = segment.end;

      // Do not try adding the cue if the start and end times are invalid.
      if (!finite(start) || !finite(end)) {
        return;
      }

      removeCuesFromTrack(start, end, this.segmentMetadataTrack_);

      var Cue = window$1.WebKitDataCue || window$1.VTTCue;
      var value = {
        custom: segment.custom,
        dateTimeObject: segment.dateTimeObject,
        dateTimeString: segment.dateTimeString,
        bandwidth: segmentInfo.playlist.attributes.BANDWIDTH,
        resolution: segmentInfo.playlist.attributes.RESOLUTION,
        codecs: segmentInfo.playlist.attributes.CODECS,
        byteLength: segmentInfo.byteLength,
        uri: segmentInfo.uri,
        timeline: segmentInfo.timeline,
        playlist: segmentInfo.playlist.uri,
        start: start,
        end: end
      };
      var data = JSON.stringify(value);
      var cue = new Cue(start, end, data);

      // Attach the metadata to the value property of the cue to keep consistency between
      // the differences of WebKitDataCue in safari and VTTCue in other browsers
      cue.value = value;

      this.segmentMetadataTrack_.addCue(cue);
    }
  }]);
  return SegmentLoader;
}(videojs.EventTarget);

var uint8ToUtf8 = function uint8ToUtf8(uintArray) {
  return decodeURIComponent(escape(String.fromCharCode.apply(null, uintArray)));
};

/**
 * @file vtt-segment-loader.js
 */

var VTT_LINE_TERMINATORS = new Uint8Array('\n\n'.split('').map(function (char) {
  return char.charCodeAt(0);
}));

/**
 * An object that manages segment loading and appending.
 *
 * @class VTTSegmentLoader
 * @param {Object} options required and optional options
 * @extends videojs.EventTarget
 */

var VTTSegmentLoader = function (_SegmentLoader) {
  inherits(VTTSegmentLoader, _SegmentLoader);

  function VTTSegmentLoader(settings) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    classCallCheck(this, VTTSegmentLoader);

    // SegmentLoader requires a MediaSource be specified or it will throw an error;
    // however, VTTSegmentLoader has no need of a media source, so delete the reference
    var _this = possibleConstructorReturn(this, (VTTSegmentLoader.__proto__ || Object.getPrototypeOf(VTTSegmentLoader)).call(this, settings, options));

    _this.mediaSource_ = null;

    _this.subtitlesTrack_ = null;
    return _this;
  }

  /**
   * Indicates which time ranges are buffered
   *
   * @return {TimeRange}
   *         TimeRange object representing the current buffered ranges
   */


  createClass(VTTSegmentLoader, [{
    key: 'buffered_',
    value: function buffered_() {
      if (!this.subtitlesTrack_ || !this.subtitlesTrack_.cues.length) {
        return videojs.createTimeRanges();
      }

      var cues = this.subtitlesTrack_.cues;
      var start = cues[0].startTime;
      var end = cues[cues.length - 1].startTime;

      return videojs.createTimeRanges([[start, end]]);
    }

    /**
     * Gets and sets init segment for the provided map
     *
     * @param {Object} map
     *        The map object representing the init segment to get or set
     * @param {Boolean=} set
     *        If true, the init segment for the provided map should be saved
     * @return {Object}
     *         map object for desired init segment
     */

  }, {
    key: 'initSegment',
    value: function initSegment(map) {
      var set$$1 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

      if (!map) {
        return null;
      }

      var id = initSegmentId(map);
      var storedMap = this.initSegments_[id];

      if (set$$1 && !storedMap && map.bytes) {
        // append WebVTT line terminators to the media initialization segment if it exists
        // to follow the WebVTT spec (https://w3c.github.io/webvtt/#file-structure) that
        // requires two or more WebVTT line terminators between the WebVTT header and the
        // rest of the file
        var combinedByteLength = VTT_LINE_TERMINATORS.byteLength + map.bytes.byteLength;
        var combinedSegment = new Uint8Array(combinedByteLength);

        combinedSegment.set(map.bytes);
        combinedSegment.set(VTT_LINE_TERMINATORS, map.bytes.byteLength);

        this.initSegments_[id] = storedMap = {
          resolvedUri: map.resolvedUri,
          byterange: map.byterange,
          bytes: combinedSegment
        };
      }

      return storedMap || map;
    }

    /**
     * Returns true if all configuration required for loading is present, otherwise false.
     *
     * @return {Boolean} True if the all configuration is ready for loading
     * @private
     */

  }, {
    key: 'couldBeginLoading_',
    value: function couldBeginLoading_() {
      return this.playlist_ && this.subtitlesTrack_ && !this.paused();
    }

    /**
     * Once all the starting parameters have been specified, begin
     * operation. This method should only be invoked from the INIT
     * state.
     *
     * @private
     */

  }, {
    key: 'init_',
    value: function init_() {
      this.state = 'READY';
      this.resetEverything();
      return this.monitorBuffer_();
    }

    /**
     * Set a subtitle track on the segment loader to add subtitles to
     *
     * @param {TextTrack=} track
     *        The text track to add loaded subtitles to
     * @return {TextTrack}
     *        Returns the subtitles track
     */

  }, {
    key: 'track',
    value: function track(_track) {
      if (typeof _track === 'undefined') {
        return this.subtitlesTrack_;
      }

      this.subtitlesTrack_ = _track;

      // if we were unpaused but waiting for a sourceUpdater, start
      // buffering now
      if (this.state === 'INIT' && this.couldBeginLoading_()) {
        this.init_();
      }

      return this.subtitlesTrack_;
    }

    /**
     * Remove any data in the source buffer between start and end times
     * @param {Number} start - the start time of the region to remove from the buffer
     * @param {Number} end - the end time of the region to remove from the buffer
     */

  }, {
    key: 'remove',
    value: function remove(start, end) {
      removeCuesFromTrack(start, end, this.subtitlesTrack_);
    }

    /**
     * fill the buffer with segements unless the sourceBuffers are
     * currently updating
     *
     * Note: this function should only ever be called by monitorBuffer_
     * and never directly
     *
     * @private
     */

  }, {
    key: 'fillBuffer_',
    value: function fillBuffer_() {
      var _this2 = this;

      if (!this.syncPoint_) {
        this.syncPoint_ = this.syncController_.getSyncPoint(this.playlist_, this.duration_(), this.currentTimeline_, this.currentTime_());
      }

      // see if we need to begin loading immediately
      var segmentInfo = this.checkBuffer_(this.buffered_(), this.playlist_, this.mediaIndex, this.hasPlayed_(), this.currentTime_(), this.syncPoint_);

      segmentInfo = this.skipEmptySegments_(segmentInfo);

      if (!segmentInfo) {
        return;
      }

      if (this.syncController_.timestampOffsetForTimeline(segmentInfo.timeline) === null) {
        // We don't have the timestamp offset that we need to sync subtitles.
        // Rerun on a timestamp offset or user interaction.
        var checkTimestampOffset = function checkTimestampOffset() {
          _this2.state = 'READY';
          if (!_this2.paused()) {
            // if not paused, queue a buffer check as soon as possible
            _this2.monitorBuffer_();
          }
        };

        this.syncController_.one('timestampoffset', checkTimestampOffset);
        this.state = 'WAITING_ON_TIMELINE';
        return;
      }

      this.loadSegment_(segmentInfo);
    }

    /**
     * Prevents the segment loader from requesting segments we know contain no subtitles
     * by walking forward until we find the next segment that we don't know whether it is
     * empty or not.
     *
     * @param {Object} segmentInfo
     *        a segment info object that describes the current segment
     * @return {Object}
     *         a segment info object that describes the current segment
     */

  }, {
    key: 'skipEmptySegments_',
    value: function skipEmptySegments_(segmentInfo) {
      while (segmentInfo && segmentInfo.segment.empty) {
        segmentInfo = this.generateSegmentInfo_(segmentInfo.playlist, segmentInfo.mediaIndex + 1, segmentInfo.startOfSegment + segmentInfo.duration, segmentInfo.isSyncRequest);
      }
      return segmentInfo;
    }

    /**
     * append a decrypted segement to the SourceBuffer through a SourceUpdater
     *
     * @private
     */

  }, {
    key: 'handleSegment_',
    value: function handleSegment_() {
      var _this3 = this;

      if (!this.pendingSegment_ || !this.subtitlesTrack_) {
        this.state = 'READY';
        return;
      }

      this.state = 'APPENDING';

      var segmentInfo = this.pendingSegment_;
      var segment = segmentInfo.segment;

      // Make sure that vttjs has loaded, otherwise, wait till it finished loading
      if (typeof window$1.WebVTT !== 'function' && this.subtitlesTrack_ && this.subtitlesTrack_.tech_) {

        var loadHandler = void 0;
        var errorHandler = function errorHandler() {
          _this3.subtitlesTrack_.tech_.off('vttjsloaded', loadHandler);
          _this3.error({
            message: 'Error loading vtt.js'
          });
          _this3.state = 'READY';
          _this3.pause();
          _this3.trigger('error');
        };

        loadHandler = function loadHandler() {
          _this3.subtitlesTrack_.tech_.off('vttjserror', errorHandler);
          _this3.handleSegment_();
        };

        this.state = 'WAITING_ON_VTTJS';
        this.subtitlesTrack_.tech_.one('vttjsloaded', loadHandler);
        this.subtitlesTrack_.tech_.one('vttjserror', errorHandler);

        return;
      }

      segment.requested = true;

      try {
        this.parseVTTCues_(segmentInfo);
      } catch (e) {
        this.error({
          message: e.message
        });
        this.state = 'READY';
        this.pause();
        return this.trigger('error');
      }

      this.updateTimeMapping_(segmentInfo, this.syncController_.timelines[segmentInfo.timeline], this.playlist_);

      if (segmentInfo.isSyncRequest) {
        this.trigger('syncinfoupdate');
        this.pendingSegment_ = null;
        this.state = 'READY';
        return;
      }

      segmentInfo.byteLength = segmentInfo.bytes.byteLength;

      this.mediaSecondsLoaded += segment.duration;

      if (segmentInfo.cues.length) {
        // remove any overlapping cues to prevent doubling
        this.remove(segmentInfo.cues[0].endTime, segmentInfo.cues[segmentInfo.cues.length - 1].endTime);
      }

      segmentInfo.cues.forEach(function (cue) {
        _this3.subtitlesTrack_.addCue(cue);
      });

      this.handleUpdateEnd_();
    }

    /**
     * Uses the WebVTT parser to parse the segment response
     *
     * @param {Object} segmentInfo
     *        a segment info object that describes the current segment
     * @private
     */

  }, {
    key: 'parseVTTCues_',
    value: function parseVTTCues_(segmentInfo) {
      var decoder = void 0;
      var decodeBytesToString = false;

      if (typeof window$1.TextDecoder === 'function') {
        decoder = new window$1.TextDecoder('utf8');
      } else {
        decoder = window$1.WebVTT.StringDecoder();
        decodeBytesToString = true;
      }

      var parser = new window$1.WebVTT.Parser(window$1, window$1.vttjs, decoder);

      segmentInfo.cues = [];
      segmentInfo.timestampmap = { MPEGTS: 0, LOCAL: 0 };

      parser.oncue = segmentInfo.cues.push.bind(segmentInfo.cues);
      parser.ontimestampmap = function (map) {
        return segmentInfo.timestampmap = map;
      };
      parser.onparsingerror = function (error) {
        videojs.log.warn('Error encountered when parsing cues: ' + error.message);
      };

      if (segmentInfo.segment.map) {
        var mapData = segmentInfo.segment.map.bytes;

        if (decodeBytesToString) {
          mapData = uint8ToUtf8(mapData);
        }

        parser.parse(mapData);
      }

      var segmentData = segmentInfo.bytes;

      if (decodeBytesToString) {
        segmentData = uint8ToUtf8(segmentData);
      }

      parser.parse(segmentData);
      parser.flush();
    }

    /**
     * Updates the start and end times of any cues parsed by the WebVTT parser using
     * the information parsed from the X-TIMESTAMP-MAP header and a TS to media time mapping
     * from the SyncController
     *
     * @param {Object} segmentInfo
     *        a segment info object that describes the current segment
     * @param {Object} mappingObj
     *        object containing a mapping from TS to media time
     * @param {Object} playlist
     *        the playlist object containing the segment
     * @private
     */

  }, {
    key: 'updateTimeMapping_',
    value: function updateTimeMapping_(segmentInfo, mappingObj, playlist) {
      var segment = segmentInfo.segment;

      if (!mappingObj) {
        // If the sync controller does not have a mapping of TS to Media Time for the
        // timeline, then we don't have enough information to update the cue
        // start/end times
        return;
      }

      if (!segmentInfo.cues.length) {
        // If there are no cues, we also do not have enough information to figure out
        // segment timing. Mark that the segment contains no cues so we don't re-request
        // an empty segment.
        segment.empty = true;
        return;
      }

      var timestampmap = segmentInfo.timestampmap;
      var diff = timestampmap.MPEGTS / 90000 - timestampmap.LOCAL + mappingObj.mapping;

      segmentInfo.cues.forEach(function (cue) {
        // First convert cue time to TS time using the timestamp-map provided within the vtt
        cue.startTime += diff;
        cue.endTime += diff;
      });

      if (!playlist.syncInfo) {
        var firstStart = segmentInfo.cues[0].startTime;
        var lastStart = segmentInfo.cues[segmentInfo.cues.length - 1].startTime;

        playlist.syncInfo = {
          mediaSequence: playlist.mediaSequence + segmentInfo.mediaIndex,
          time: Math.min(firstStart, lastStart - segment.duration)
        };
      }
    }
  }]);
  return VTTSegmentLoader;
}(SegmentLoader);

/**
 * @file ad-cue-tags.js
 */

/**
 * Searches for an ad cue that overlaps with the given mediaTime
 */
var findAdCue = function findAdCue(track, mediaTime) {
  var cues = track.cues;

  for (var i = 0; i < cues.length; i++) {
    var cue = cues[i];

    if (mediaTime >= cue.adStartTime && mediaTime <= cue.adEndTime) {
      return cue;
    }
  }
  return null;
};

var updateAdCues = function updateAdCues(media, track) {
  var offset = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;

  if (!media.segments) {
    return;
  }

  var mediaTime = offset;
  var cue = void 0;

  for (var i = 0; i < media.segments.length; i++) {
    var segment = media.segments[i];

    if (!cue) {
      // Since the cues will span for at least the segment duration, adding a fudge
      // factor of half segment duration will prevent duplicate cues from being
      // created when timing info is not exact (e.g. cue start time initialized
      // at 10.006677, but next call mediaTime is 10.003332 )
      cue = findAdCue(track, mediaTime + segment.duration / 2);
    }

    if (cue) {
      if ('cueIn' in segment) {
        // Found a CUE-IN so end the cue
        cue.endTime = mediaTime;
        cue.adEndTime = mediaTime;
        mediaTime += segment.duration;
        cue = null;
        continue;
      }

      if (mediaTime < cue.endTime) {
        // Already processed this mediaTime for this cue
        mediaTime += segment.duration;
        continue;
      }

      // otherwise extend cue until a CUE-IN is found
      cue.endTime += segment.duration;
    } else {
      if ('cueOut' in segment) {
        cue = new window$1.VTTCue(mediaTime, mediaTime + segment.duration, segment.cueOut);
        cue.adStartTime = mediaTime;
        // Assumes tag format to be
        // #EXT-X-CUE-OUT:30
        cue.adEndTime = mediaTime + parseFloat(segment.cueOut);
        track.addCue(cue);
      }

      if ('cueOutCont' in segment) {
        // Entered into the middle of an ad cue
        var adOffset = void 0;
        var adTotal = void 0;

        // Assumes tag formate to be
        // #EXT-X-CUE-OUT-CONT:10/30

        var _segment$cueOutCont$s = segment.cueOutCont.split('/').map(parseFloat);

        var _segment$cueOutCont$s2 = slicedToArray(_segment$cueOutCont$s, 2);

        adOffset = _segment$cueOutCont$s2[0];
        adTotal = _segment$cueOutCont$s2[1];


        cue = new window$1.VTTCue(mediaTime, mediaTime + segment.duration, '');
        cue.adStartTime = mediaTime - adOffset;
        cue.adEndTime = cue.adStartTime + adTotal;
        track.addCue(cue);
      }
    }
    mediaTime += segment.duration;
  }
};

/**
 * @file sync-controller.js
 */

var tsprobe = tsInspector.inspect;

var syncPointStrategies = [
// Stategy "VOD": Handle the VOD-case where the sync-point is *always*
//                the equivalence display-time 0 === segment-index 0
{
  name: 'VOD',
  run: function run(syncController, playlist, duration$$1, currentTimeline, currentTime) {
    if (duration$$1 !== Infinity) {
      var syncPoint = {
        time: 0,
        segmentIndex: 0
      };

      return syncPoint;
    }
    return null;
  }
},
// Stategy "ProgramDateTime": We have a program-date-time tag in this playlist
{
  name: 'ProgramDateTime',
  run: function run(syncController, playlist, duration$$1, currentTimeline, currentTime) {
    if (!syncController.datetimeToDisplayTime) {
      return null;
    }

    var segments = playlist.segments || [];
    var syncPoint = null;
    var lastDistance = null;

    currentTime = currentTime || 0;

    for (var i = 0; i < segments.length; i++) {
      var segment = segments[i];

      if (segment.dateTimeObject) {
        var segmentTime = segment.dateTimeObject.getTime() / 1000;
        var segmentStart = segmentTime + syncController.datetimeToDisplayTime;
        var distance = Math.abs(currentTime - segmentStart);

        // Once the distance begins to increase, or if distance is 0, we have passed
        // currentTime and can stop looking for better candidates
        if (lastDistance !== null && (distance === 0 || lastDistance < distance)) {
          break;
        }

        lastDistance = distance;
        syncPoint = {
          time: segmentStart,
          segmentIndex: i
        };
      }
    }
    return syncPoint;
  }
},
// Stategy "Segment": We have a known time mapping for a timeline and a
//                    segment in the current timeline with timing data
{
  name: 'Segment',
  run: function run(syncController, playlist, duration$$1, currentTimeline, currentTime) {
    var segments = playlist.segments || [];
    var syncPoint = null;
    var lastDistance = null;

    currentTime = currentTime || 0;

    for (var i = 0; i < segments.length; i++) {
      var segment = segments[i];

      if (segment.timeline === currentTimeline && typeof segment.start !== 'undefined') {
        var distance = Math.abs(currentTime - segment.start);

        // Once the distance begins to increase, we have passed
        // currentTime and can stop looking for better candidates
        if (lastDistance !== null && lastDistance < distance) {
          break;
        }

        if (!syncPoint || lastDistance === null || lastDistance >= distance) {
          lastDistance = distance;
          syncPoint = {
            time: segment.start,
            segmentIndex: i
          };
        }
      }
    }
    return syncPoint;
  }
},
// Stategy "Discontinuity": We have a discontinuity with a known
//                          display-time
{
  name: 'Discontinuity',
  run: function run(syncController, playlist, duration$$1, currentTimeline, currentTime) {
    var syncPoint = null;

    currentTime = currentTime || 0;

    if (playlist.discontinuityStarts && playlist.discontinuityStarts.length) {
      var lastDistance = null;

      for (var i = 0; i < playlist.discontinuityStarts.length; i++) {
        var segmentIndex = playlist.discontinuityStarts[i];
        var discontinuity = playlist.discontinuitySequence + i + 1;
        var discontinuitySync = syncController.discontinuities[discontinuity];

        if (discontinuitySync) {
          var distance = Math.abs(currentTime - discontinuitySync.time);

          // Once the distance begins to increase, we have passed
          // currentTime and can stop looking for better candidates
          if (lastDistance !== null && lastDistance < distance) {
            break;
          }

          if (!syncPoint || lastDistance === null || lastDistance >= distance) {
            lastDistance = distance;
            syncPoint = {
              time: discontinuitySync.time,
              segmentIndex: segmentIndex
            };
          }
        }
      }
    }
    return syncPoint;
  }
},
// Stategy "Playlist": We have a playlist with a known mapping of
//                     segment index to display time
{
  name: 'Playlist',
  run: function run(syncController, playlist, duration$$1, currentTimeline, currentTime) {
    if (playlist.syncInfo) {
      var syncPoint = {
        time: playlist.syncInfo.time,
        segmentIndex: playlist.syncInfo.mediaSequence - playlist.mediaSequence
      };

      return syncPoint;
    }
    return null;
  }
}];

var SyncController = function (_videojs$EventTarget) {
  inherits(SyncController, _videojs$EventTarget);

  function SyncController() {
    classCallCheck(this, SyncController);

    // Segment Loader state variables...
    // ...for synching across variants
    var _this = possibleConstructorReturn(this, (SyncController.__proto__ || Object.getPrototypeOf(SyncController)).call(this));

    _this.inspectCache_ = undefined;

    // ...for synching across variants
    _this.timelines = [];
    _this.discontinuities = [];
    _this.datetimeToDisplayTime = null;

    _this.logger_ = logger('SyncController');
    return _this;
  }

  /**
   * Find a sync-point for the playlist specified
   *
   * A sync-point is defined as a known mapping from display-time to
   * a segment-index in the current playlist.
   *
   * @param {Playlist} playlist
   *        The playlist that needs a sync-point
   * @param {Number} duration
   *        Duration of the MediaSource (Infinite if playing a live source)
   * @param {Number} currentTimeline
   *        The last timeline from which a segment was loaded
   * @returns {Object}
   *          A sync-point object
   */


  createClass(SyncController, [{
    key: 'getSyncPoint',
    value: function getSyncPoint(playlist, duration$$1, currentTimeline, currentTime) {
      var syncPoints = this.runStrategies_(playlist, duration$$1, currentTimeline, currentTime);

      if (!syncPoints.length) {
        // Signal that we need to attempt to get a sync-point manually
        // by fetching a segment in the playlist and constructing
        // a sync-point from that information
        return null;
      }

      // Now find the sync-point that is closest to the currentTime because
      // that should result in the most accurate guess about which segment
      // to fetch
      return this.selectSyncPoint_(syncPoints, { key: 'time', value: currentTime });
    }

    /**
     * Calculate the amount of time that has expired off the playlist during playback
     *
     * @param {Playlist} playlist
     *        Playlist object to calculate expired from
     * @param {Number} duration
     *        Duration of the MediaSource (Infinity if playling a live source)
     * @returns {Number|null}
     *          The amount of time that has expired off the playlist during playback. Null
     *          if no sync-points for the playlist can be found.
     */

  }, {
    key: 'getExpiredTime',
    value: function getExpiredTime(playlist, duration$$1) {
      if (!playlist || !playlist.segments) {
        return null;
      }

      var syncPoints = this.runStrategies_(playlist, duration$$1, playlist.discontinuitySequence, 0);

      // Without sync-points, there is not enough information to determine the expired time
      if (!syncPoints.length) {
        return null;
      }

      var syncPoint = this.selectSyncPoint_(syncPoints, {
        key: 'segmentIndex',
        value: 0
      });

      // If the sync-point is beyond the start of the playlist, we want to subtract the
      // duration from index 0 to syncPoint.segmentIndex instead of adding.
      if (syncPoint.segmentIndex > 0) {
        syncPoint.time *= -1;
      }

      return Math.abs(syncPoint.time + sumDurations(playlist, syncPoint.segmentIndex, 0));
    }

    /**
     * Runs each sync-point strategy and returns a list of sync-points returned by the
     * strategies
     *
     * @private
     * @param {Playlist} playlist
     *        The playlist that needs a sync-point
     * @param {Number} duration
     *        Duration of the MediaSource (Infinity if playing a live source)
     * @param {Number} currentTimeline
     *        The last timeline from which a segment was loaded
     * @returns {Array}
     *          A list of sync-point objects
     */

  }, {
    key: 'runStrategies_',
    value: function runStrategies_(playlist, duration$$1, currentTimeline, currentTime) {
      var syncPoints = [];

      // Try to find a sync-point in by utilizing various strategies...
      for (var i = 0; i < syncPointStrategies.length; i++) {
        var strategy = syncPointStrategies[i];
        var syncPoint = strategy.run(this, playlist, duration$$1, currentTimeline, currentTime);

        if (syncPoint) {
          syncPoint.strategy = strategy.name;
          syncPoints.push({
            strategy: strategy.name,
            syncPoint: syncPoint
          });
        }
      }

      return syncPoints;
    }

    /**
     * Selects the sync-point nearest the specified target
     *
     * @private
     * @param {Array} syncPoints
     *        List of sync-points to select from
     * @param {Object} target
     *        Object specifying the property and value we are targeting
     * @param {String} target.key
     *        Specifies the property to target. Must be either 'time' or 'segmentIndex'
     * @param {Number} target.value
     *        The value to target for the specified key.
     * @returns {Object}
     *          The sync-point nearest the target
     */

  }, {
    key: 'selectSyncPoint_',
    value: function selectSyncPoint_(syncPoints, target) {
      var bestSyncPoint = syncPoints[0].syncPoint;
      var bestDistance = Math.abs(syncPoints[0].syncPoint[target.key] - target.value);
      var bestStrategy = syncPoints[0].strategy;

      for (var i = 1; i < syncPoints.length; i++) {
        var newDistance = Math.abs(syncPoints[i].syncPoint[target.key] - target.value);

        if (newDistance < bestDistance) {
          bestDistance = newDistance;
          bestSyncPoint = syncPoints[i].syncPoint;
          bestStrategy = syncPoints[i].strategy;
        }
      }

      this.logger_('syncPoint for [' + target.key + ': ' + target.value + '] chosen with strategy' + (' [' + bestStrategy + ']: [time:' + bestSyncPoint.time + ',') + (' segmentIndex:' + bestSyncPoint.segmentIndex + ']'));

      return bestSyncPoint;
    }

    /**
     * Save any meta-data present on the segments when segments leave
     * the live window to the playlist to allow for synchronization at the
     * playlist level later.
     *
     * @param {Playlist} oldPlaylist - The previous active playlist
     * @param {Playlist} newPlaylist - The updated and most current playlist
     */

  }, {
    key: 'saveExpiredSegmentInfo',
    value: function saveExpiredSegmentInfo(oldPlaylist, newPlaylist) {
      var mediaSequenceDiff = newPlaylist.mediaSequence - oldPlaylist.mediaSequence;

      // When a segment expires from the playlist and it has a start time
      // save that information as a possible sync-point reference in future
      for (var i = mediaSequenceDiff - 1; i >= 0; i--) {
        var lastRemovedSegment = oldPlaylist.segments[i];

        if (lastRemovedSegment && typeof lastRemovedSegment.start !== 'undefined') {
          newPlaylist.syncInfo = {
            mediaSequence: oldPlaylist.mediaSequence + i,
            time: lastRemovedSegment.start
          };
          this.logger_('playlist refresh sync: [time:' + newPlaylist.syncInfo.time + ',' + (' mediaSequence: ' + newPlaylist.syncInfo.mediaSequence + ']'));
          this.trigger('syncinfoupdate');
          break;
        }
      }
    }

    /**
     * Save the mapping from playlist's ProgramDateTime to display. This should
     * only ever happen once at the start of playback.
     *
     * @param {Playlist} playlist - The currently active playlist
     */

  }, {
    key: 'setDateTimeMapping',
    value: function setDateTimeMapping(playlist) {
      if (!this.datetimeToDisplayTime && playlist.segments && playlist.segments.length && playlist.segments[0].dateTimeObject) {
        var playlistTimestamp = playlist.segments[0].dateTimeObject.getTime() / 1000;

        this.datetimeToDisplayTime = -playlistTimestamp;
      }
    }

    /**
     * Reset the state of the inspection cache when we do a rendition
     * switch
     */

  }, {
    key: 'reset',
    value: function reset() {
      this.inspectCache_ = undefined;
    }

    /**
     * Probe or inspect a fmp4 or an mpeg2-ts segment to determine the start
     * and end of the segment in it's internal "media time". Used to generate
     * mappings from that internal "media time" to the display time that is
     * shown on the player.
     *
     * @param {SegmentInfo} segmentInfo - The current active request information
     */

  }, {
    key: 'probeSegmentInfo',
    value: function probeSegmentInfo(segmentInfo) {
      var segment = segmentInfo.segment;
      var playlist = segmentInfo.playlist;
      var timingInfo = void 0;

      if (segment.map) {
        timingInfo = this.probeMp4Segment_(segmentInfo);
      } else {
        timingInfo = this.probeTsSegment_(segmentInfo);
      }

      if (timingInfo) {
        if (this.calculateSegmentTimeMapping_(segmentInfo, timingInfo)) {
          this.saveDiscontinuitySyncInfo_(segmentInfo);

          // If the playlist does not have sync information yet, record that information
          // now with segment timing information
          if (!playlist.syncInfo) {
            playlist.syncInfo = {
              mediaSequence: playlist.mediaSequence + segmentInfo.mediaIndex,
              time: segment.start
            };
          }
        }
      }

      return timingInfo;
    }

    /**
     * Probe an fmp4 or an mpeg2-ts segment to determine the start of the segment
     * in it's internal "media time".
     *
     * @private
     * @param {SegmentInfo} segmentInfo - The current active request information
     * @return {object} The start and end time of the current segment in "media time"
     */

  }, {
    key: 'probeMp4Segment_',
    value: function probeMp4Segment_(segmentInfo) {
      var segment = segmentInfo.segment;
      var timescales = mp4probe.timescale(segment.map.bytes);
      var startTime = mp4probe.startTime(timescales, segmentInfo.bytes);

      if (segmentInfo.timestampOffset !== null) {
        segmentInfo.timestampOffset -= startTime;
      }

      return {
        start: startTime,
        end: startTime + segment.duration
      };
    }

    /**
     * Probe an mpeg2-ts segment to determine the start and end of the segment
     * in it's internal "media time".
     *
     * @private
     * @param {SegmentInfo} segmentInfo - The current active request information
     * @return {object} The start and end time of the current segment in "media time"
     */

  }, {
    key: 'probeTsSegment_',
    value: function probeTsSegment_(segmentInfo) {
      var timeInfo = tsprobe(segmentInfo.bytes, this.inspectCache_);
      var segmentStartTime = void 0;
      var segmentEndTime = void 0;
      var segmentTimestampInfo = void 0;

      if (!timeInfo) {
        return null;
      }

      if (timeInfo.video && timeInfo.video.length === 2) {
        this.inspectCache_ = timeInfo.video[1].dts;
        segmentStartTime = timeInfo.video[0].dtsTime;
        segmentEndTime = timeInfo.video[1].dtsTime;
        segmentTimestampInfo = timeInfo.video;
      } else if (timeInfo.audio && timeInfo.audio.length === 2) {
        this.inspectCache_ = timeInfo.audio[1].dts;
        segmentStartTime = timeInfo.audio[0].dtsTime;
        segmentEndTime = timeInfo.audio[1].dtsTime;
        segmentTimestampInfo = timeInfo.audio;
      }

      var probedInfo = {
        segmentTimestampInfo: segmentTimestampInfo,
        start: segmentStartTime,
        end: segmentEndTime,
        containsVideo: timeInfo.video && timeInfo.video.length === 2,
        containsAudio: timeInfo.audio && timeInfo.audio.length === 2
      };

      return probedInfo;
    }
  }, {
    key: 'timestampOffsetForTimeline',
    value: function timestampOffsetForTimeline(timeline) {
      if (typeof this.timelines[timeline] === 'undefined') {
        return null;
      }
      return this.timelines[timeline].time;
    }
  }, {
    key: 'mappingForTimeline',
    value: function mappingForTimeline(timeline) {
      if (typeof this.timelines[timeline] === 'undefined') {
        return null;
      }
      return this.timelines[timeline].mapping;
    }

    /**
     * Use the "media time" for a segment to generate a mapping to "display time" and
     * save that display time to the segment.
     *
     * @private
     * @param {SegmentInfo} segmentInfo
     *        The current active request information
     * @param {object} timingInfo
     *        The start and end time of the current segment in "media time"
     * @returns {Boolean}
     *          Returns false if segment time mapping could not be calculated
     */

  }, {
    key: 'calculateSegmentTimeMapping_',
    value: function calculateSegmentTimeMapping_(segmentInfo, timingInfo) {
      var segment = segmentInfo.segment;
      var mappingObj = this.timelines[segmentInfo.timeline];

      if (segmentInfo.timestampOffset !== null) {
        mappingObj = {
          time: segmentInfo.startOfSegment,
          mapping: segmentInfo.startOfSegment - timingInfo.start
        };
        this.timelines[segmentInfo.timeline] = mappingObj;
        this.trigger('timestampoffset');

        this.logger_('time mapping for timeline ' + segmentInfo.timeline + ': ' + ('[time: ' + mappingObj.time + '] [mapping: ' + mappingObj.mapping + ']'));

        segment.start = segmentInfo.startOfSegment;
        segment.end = timingInfo.end + mappingObj.mapping;
      } else if (mappingObj) {
        segment.start = timingInfo.start + mappingObj.mapping;
        segment.end = timingInfo.end + mappingObj.mapping;
      } else {
        return false;
      }

      return true;
    }

    /**
     * Each time we have discontinuity in the playlist, attempt to calculate the location
     * in display of the start of the discontinuity and save that. We also save an accuracy
     * value so that we save values with the most accuracy (closest to 0.)
     *
     * @private
     * @param {SegmentInfo} segmentInfo - The current active request information
     */

  }, {
    key: 'saveDiscontinuitySyncInfo_',
    value: function saveDiscontinuitySyncInfo_(segmentInfo) {
      var playlist = segmentInfo.playlist;
      var segment = segmentInfo.segment;

      // If the current segment is a discontinuity then we know exactly where
      // the start of the range and it's accuracy is 0 (greater accuracy values
      // mean more approximation)
      if (segment.discontinuity) {
        this.discontinuities[segment.timeline] = {
          time: segment.start,
          accuracy: 0
        };
      } else if (playlist.discontinuityStarts && playlist.discontinuityStarts.length) {
        // Search for future discontinuities that we can provide better timing
        // information for and save that information for sync purposes
        for (var i = 0; i < playlist.discontinuityStarts.length; i++) {
          var segmentIndex = playlist.discontinuityStarts[i];
          var discontinuity = playlist.discontinuitySequence + i + 1;
          var mediaIndexDiff = segmentIndex - segmentInfo.mediaIndex;
          var accuracy = Math.abs(mediaIndexDiff);

          if (!this.discontinuities[discontinuity] || this.discontinuities[discontinuity].accuracy > accuracy) {
            var time = void 0;

            if (mediaIndexDiff < 0) {
              time = segment.start - sumDurations(playlist, segmentInfo.mediaIndex, segmentIndex);
            } else {
              time = segment.end + sumDurations(playlist, segmentInfo.mediaIndex + 1, segmentIndex);
            }

            this.discontinuities[discontinuity] = {
              time: time,
              accuracy: accuracy
            };
          }
        }
      }
    }
  }]);
  return SyncController;
}(videojs.EventTarget);

var Decrypter = new shimWorker("./decrypter-worker.worker.js", function (window, document$$1) {
  var self = this;
  var decrypterWorker = function () {

    /*
     * pkcs7.pad
     * https://github.com/brightcove/pkcs7
     *
     * Copyright (c) 2014 Brightcove
     * Licensed under the apache2 license.
     */

    /**
     * Returns the subarray of a Uint8Array without PKCS#7 padding.
     * @param padded {Uint8Array} unencrypted bytes that have been padded
     * @return {Uint8Array} the unpadded bytes
     * @see http://tools.ietf.org/html/rfc5652
     */

    function unpad(padded) {
      return padded.subarray(0, padded.byteLength - padded[padded.byteLength - 1]);
    }

    var classCallCheck = function classCallCheck(instance, Constructor) {
      if (!(instance instanceof Constructor)) {
        throw new TypeError("Cannot call a class as a function");
      }
    };

    var createClass = function () {
      function defineProperties(target, props) {
        for (var i = 0; i < props.length; i++) {
          var descriptor = props[i];
          descriptor.enumerable = descriptor.enumerable || false;
          descriptor.configurable = true;
          if ("value" in descriptor) descriptor.writable = true;
          Object.defineProperty(target, descriptor.key, descriptor);
        }
      }

      return function (Constructor, protoProps, staticProps) {
        if (protoProps) defineProperties(Constructor.prototype, protoProps);
        if (staticProps) defineProperties(Constructor, staticProps);
        return Constructor;
      };
    }();

    var inherits = function inherits(subClass, superClass) {
      if (typeof superClass !== "function" && superClass !== null) {
        throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
      }

      subClass.prototype = Object.create(superClass && superClass.prototype, {
        constructor: {
          value: subClass,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
      if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
    };

    var possibleConstructorReturn = function possibleConstructorReturn(self, call) {
      if (!self) {
        throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
      }

      return call && (typeof call === "object" || typeof call === "function") ? call : self;
    };

    /**
     * @file aes.js
     *
     * This file contains an adaptation of the AES decryption algorithm
     * from the Standford Javascript Cryptography Library. That work is
     * covered by the following copyright and permissions notice:
     *
     * Copyright 2009-2010 Emily Stark, Mike Hamburg, Dan Boneh.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions are
     * met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     *
     * 2. Redistributions in binary form must reproduce the above
     *    copyright notice, this list of conditions and the following
     *    disclaimer in the documentation and/or other materials provided
     *    with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR CONTRIBUTORS BE
     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * The views and conclusions contained in the software and documentation
     * are those of the authors and should not be interpreted as representing
     * official policies, either expressed or implied, of the authors.
     */

    /**
     * Expand the S-box tables.
     *
     * @private
     */
    var precompute = function precompute() {
      var tables = [[[], [], [], [], []], [[], [], [], [], []]];
      var encTable = tables[0];
      var decTable = tables[1];
      var sbox = encTable[4];
      var sboxInv = decTable[4];
      var i = void 0;
      var x = void 0;
      var xInv = void 0;
      var d = [];
      var th = [];
      var x2 = void 0;
      var x4 = void 0;
      var x8 = void 0;
      var s = void 0;
      var tEnc = void 0;
      var tDec = void 0;

      // Compute double and third tables
      for (i = 0; i < 256; i++) {
        th[(d[i] = i << 1 ^ (i >> 7) * 283) ^ i] = i;
      }

      for (x = xInv = 0; !sbox[x]; x ^= x2 || 1, xInv = th[xInv] || 1) {
        // Compute sbox
        s = xInv ^ xInv << 1 ^ xInv << 2 ^ xInv << 3 ^ xInv << 4;
        s = s >> 8 ^ s & 255 ^ 99;
        sbox[x] = s;
        sboxInv[s] = x;

        // Compute MixColumns
        x8 = d[x4 = d[x2 = d[x]]];
        tDec = x8 * 0x1010101 ^ x4 * 0x10001 ^ x2 * 0x101 ^ x * 0x1010100;
        tEnc = d[s] * 0x101 ^ s * 0x1010100;

        for (i = 0; i < 4; i++) {
          encTable[i][x] = tEnc = tEnc << 24 ^ tEnc >>> 8;
          decTable[i][s] = tDec = tDec << 24 ^ tDec >>> 8;
        }
      }

      // Compactify. Considerable speedup on Firefox.
      for (i = 0; i < 5; i++) {
        encTable[i] = encTable[i].slice(0);
        decTable[i] = decTable[i].slice(0);
      }
      return tables;
    };
    var aesTables = null;

    /**
     * Schedule out an AES key for both encryption and decryption. This
     * is a low-level class. Use a cipher mode to do bulk encryption.
     *
     * @class AES
     * @param key {Array} The key as an array of 4, 6 or 8 words.
     */

    var AES = function () {
      function AES(key) {
        classCallCheck(this, AES);

        /**
         * The expanded S-box and inverse S-box tables. These will be computed
         * on the client so that we don't have to send them down the wire.
         *
         * There are two tables, _tables[0] is for encryption and
         * _tables[1] is for decryption.
         *
         * The first 4 sub-tables are the expanded S-box with MixColumns. The
         * last (_tables[01][4]) is the S-box itself.
         *
         * @private
         */
        // if we have yet to precompute the S-box tables
        // do so now
        if (!aesTables) {
          aesTables = precompute();
        }
        // then make a copy of that object for use
        this._tables = [[aesTables[0][0].slice(), aesTables[0][1].slice(), aesTables[0][2].slice(), aesTables[0][3].slice(), aesTables[0][4].slice()], [aesTables[1][0].slice(), aesTables[1][1].slice(), aesTables[1][2].slice(), aesTables[1][3].slice(), aesTables[1][4].slice()]];
        var i = void 0;
        var j = void 0;
        var tmp = void 0;
        var encKey = void 0;
        var decKey = void 0;
        var sbox = this._tables[0][4];
        var decTable = this._tables[1];
        var keyLen = key.length;
        var rcon = 1;

        if (keyLen !== 4 && keyLen !== 6 && keyLen !== 8) {
          throw new Error('Invalid aes key size');
        }

        encKey = key.slice(0);
        decKey = [];
        this._key = [encKey, decKey];

        // schedule encryption keys
        for (i = keyLen; i < 4 * keyLen + 28; i++) {
          tmp = encKey[i - 1];

          // apply sbox
          if (i % keyLen === 0 || keyLen === 8 && i % keyLen === 4) {
            tmp = sbox[tmp >>> 24] << 24 ^ sbox[tmp >> 16 & 255] << 16 ^ sbox[tmp >> 8 & 255] << 8 ^ sbox[tmp & 255];

            // shift rows and add rcon
            if (i % keyLen === 0) {
              tmp = tmp << 8 ^ tmp >>> 24 ^ rcon << 24;
              rcon = rcon << 1 ^ (rcon >> 7) * 283;
            }
          }

          encKey[i] = encKey[i - keyLen] ^ tmp;
        }

        // schedule decryption keys
        for (j = 0; i; j++, i--) {
          tmp = encKey[j & 3 ? i : i - 4];
          if (i <= 4 || j < 4) {
            decKey[j] = tmp;
          } else {
            decKey[j] = decTable[0][sbox[tmp >>> 24]] ^ decTable[1][sbox[tmp >> 16 & 255]] ^ decTable[2][sbox[tmp >> 8 & 255]] ^ decTable[3][sbox[tmp & 255]];
          }
        }
      }

      /**
       * Decrypt 16 bytes, specified as four 32-bit words.
       *
       * @param {Number} encrypted0 the first word to decrypt
       * @param {Number} encrypted1 the second word to decrypt
       * @param {Number} encrypted2 the third word to decrypt
       * @param {Number} encrypted3 the fourth word to decrypt
       * @param {Int32Array} out the array to write the decrypted words
       * into
       * @param {Number} offset the offset into the output array to start
       * writing results
       * @return {Array} The plaintext.
       */

      AES.prototype.decrypt = function decrypt(encrypted0, encrypted1, encrypted2, encrypted3, out, offset) {
        var key = this._key[1];
        // state variables a,b,c,d are loaded with pre-whitened data
        var a = encrypted0 ^ key[0];
        var b = encrypted3 ^ key[1];
        var c = encrypted2 ^ key[2];
        var d = encrypted1 ^ key[3];
        var a2 = void 0;
        var b2 = void 0;
        var c2 = void 0;

        // key.length === 2 ?
        var nInnerRounds = key.length / 4 - 2;
        var i = void 0;
        var kIndex = 4;
        var table = this._tables[1];

        // load up the tables
        var table0 = table[0];
        var table1 = table[1];
        var table2 = table[2];
        var table3 = table[3];
        var sbox = table[4];

        // Inner rounds. Cribbed from OpenSSL.
        for (i = 0; i < nInnerRounds; i++) {
          a2 = table0[a >>> 24] ^ table1[b >> 16 & 255] ^ table2[c >> 8 & 255] ^ table3[d & 255] ^ key[kIndex];
          b2 = table0[b >>> 24] ^ table1[c >> 16 & 255] ^ table2[d >> 8 & 255] ^ table3[a & 255] ^ key[kIndex + 1];
          c2 = table0[c >>> 24] ^ table1[d >> 16 & 255] ^ table2[a >> 8 & 255] ^ table3[b & 255] ^ key[kIndex + 2];
          d = table0[d >>> 24] ^ table1[a >> 16 & 255] ^ table2[b >> 8 & 255] ^ table3[c & 255] ^ key[kIndex + 3];
          kIndex += 4;
          a = a2;b = b2;c = c2;
        }

        // Last round.
        for (i = 0; i < 4; i++) {
          out[(3 & -i) + offset] = sbox[a >>> 24] << 24 ^ sbox[b >> 16 & 255] << 16 ^ sbox[c >> 8 & 255] << 8 ^ sbox[d & 255] ^ key[kIndex++];
          a2 = a;a = b;b = c;c = d;d = a2;
        }
      };

      return AES;
    }();

    /**
     * @file stream.js
     */
    /**
     * A lightweight readable stream implemention that handles event dispatching.
     *
     * @class Stream
     */
    var Stream = function () {
      function Stream() {
        classCallCheck(this, Stream);

        this.listeners = {};
      }

      /**
       * Add a listener for a specified event type.
       *
       * @param {String} type the event name
       * @param {Function} listener the callback to be invoked when an event of
       * the specified type occurs
       */

      Stream.prototype.on = function on(type, listener) {
        if (!this.listeners[type]) {
          this.listeners[type] = [];
        }
        this.listeners[type].push(listener);
      };

      /**
       * Remove a listener for a specified event type.
       *
       * @param {String} type the event name
       * @param {Function} listener  a function previously registered for this
       * type of event through `on`
       * @return {Boolean} if we could turn it off or not
       */

      Stream.prototype.off = function off(type, listener) {
        if (!this.listeners[type]) {
          return false;
        }

        var index = this.listeners[type].indexOf(listener);

        this.listeners[type].splice(index, 1);
        return index > -1;
      };

      /**
       * Trigger an event of the specified type on this stream. Any additional
       * arguments to this function are passed as parameters to event listeners.
       *
       * @param {String} type the event name
       */

      Stream.prototype.trigger = function trigger(type) {
        var callbacks = this.listeners[type];

        if (!callbacks) {
          return;
        }

        // Slicing the arguments on every invocation of this method
        // can add a significant amount of overhead. Avoid the
        // intermediate object creation for the common case of a
        // single callback argument
        if (arguments.length === 2) {
          var length = callbacks.length;

          for (var i = 0; i < length; ++i) {
            callbacks[i].call(this, arguments[1]);
          }
        } else {
          var args = Array.prototype.slice.call(arguments, 1);
          var _length = callbacks.length;

          for (var _i = 0; _i < _length; ++_i) {
            callbacks[_i].apply(this, args);
          }
        }
      };

      /**
       * Destroys the stream and cleans up.
       */

      Stream.prototype.dispose = function dispose() {
        this.listeners = {};
      };
      /**
       * Forwards all `data` events on this stream to the destination stream. The
       * destination stream should provide a method `push` to receive the data
       * events as they arrive.
       *
       * @param {Stream} destination the stream that will receive all `data` events
       * @see http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options
       */

      Stream.prototype.pipe = function pipe(destination) {
        this.on('data', function (data) {
          destination.push(data);
        });
      };

      return Stream;
    }();

    /**
     * @file async-stream.js
     */
    /**
     * A wrapper around the Stream class to use setTiemout
     * and run stream "jobs" Asynchronously
     *
     * @class AsyncStream
     * @extends Stream
     */

    var AsyncStream = function (_Stream) {
      inherits(AsyncStream, _Stream);

      function AsyncStream() {
        classCallCheck(this, AsyncStream);

        var _this = possibleConstructorReturn(this, _Stream.call(this, Stream));

        _this.jobs = [];
        _this.delay = 1;
        _this.timeout_ = null;
        return _this;
      }

      /**
       * process an async job
       *
       * @private
       */

      AsyncStream.prototype.processJob_ = function processJob_() {
        this.jobs.shift()();
        if (this.jobs.length) {
          this.timeout_ = setTimeout(this.processJob_.bind(this), this.delay);
        } else {
          this.timeout_ = null;
        }
      };

      /**
       * push a job into the stream
       *
       * @param {Function} job the job to push into the stream
       */

      AsyncStream.prototype.push = function push(job) {
        this.jobs.push(job);
        if (!this.timeout_) {
          this.timeout_ = setTimeout(this.processJob_.bind(this), this.delay);
        }
      };

      return AsyncStream;
    }(Stream);

    /**
     * @file decrypter.js
     *
     * An asynchronous implementation of AES-128 CBC decryption with
     * PKCS#7 padding.
     */

    /**
     * Convert network-order (big-endian) bytes into their little-endian
     * representation.
     */
    var ntoh = function ntoh(word) {
      return word << 24 | (word & 0xff00) << 8 | (word & 0xff0000) >> 8 | word >>> 24;
    };

    /**
     * Decrypt bytes using AES-128 with CBC and PKCS#7 padding.
     *
     * @param {Uint8Array} encrypted the encrypted bytes
     * @param {Uint32Array} key the bytes of the decryption key
     * @param {Uint32Array} initVector the initialization vector (IV) to
     * use for the first round of CBC.
     * @return {Uint8Array} the decrypted bytes
     *
     * @see http://en.wikipedia.org/wiki/Advanced_Encryption_Standard
     * @see http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_Block_Chaining_.28CBC.29
     * @see https://tools.ietf.org/html/rfc2315
     */
    var decrypt = function decrypt(encrypted, key, initVector) {
      // word-level access to the encrypted bytes
      var encrypted32 = new Int32Array(encrypted.buffer, encrypted.byteOffset, encrypted.byteLength >> 2);

      var decipher = new AES(Array.prototype.slice.call(key));

      // byte and word-level access for the decrypted output
      var decrypted = new Uint8Array(encrypted.byteLength);
      var decrypted32 = new Int32Array(decrypted.buffer);

      // temporary variables for working with the IV, encrypted, and
      // decrypted data
      var init0 = void 0;
      var init1 = void 0;
      var init2 = void 0;
      var init3 = void 0;
      var encrypted0 = void 0;
      var encrypted1 = void 0;
      var encrypted2 = void 0;
      var encrypted3 = void 0;

      // iteration variable
      var wordIx = void 0;

      // pull out the words of the IV to ensure we don't modify the
      // passed-in reference and easier access
      init0 = initVector[0];
      init1 = initVector[1];
      init2 = initVector[2];
      init3 = initVector[3];

      // decrypt four word sequences, applying cipher-block chaining (CBC)
      // to each decrypted block
      for (wordIx = 0; wordIx < encrypted32.length; wordIx += 4) {
        // convert big-endian (network order) words into little-endian
        // (javascript order)
        encrypted0 = ntoh(encrypted32[wordIx]);
        encrypted1 = ntoh(encrypted32[wordIx + 1]);
        encrypted2 = ntoh(encrypted32[wordIx + 2]);
        encrypted3 = ntoh(encrypted32[wordIx + 3]);

        // decrypt the block
        decipher.decrypt(encrypted0, encrypted1, encrypted2, encrypted3, decrypted32, wordIx);

        // XOR with the IV, and restore network byte-order to obtain the
        // plaintext
        decrypted32[wordIx] = ntoh(decrypted32[wordIx] ^ init0);
        decrypted32[wordIx + 1] = ntoh(decrypted32[wordIx + 1] ^ init1);
        decrypted32[wordIx + 2] = ntoh(decrypted32[wordIx + 2] ^ init2);
        decrypted32[wordIx + 3] = ntoh(decrypted32[wordIx + 3] ^ init3);

        // setup the IV for the next round
        init0 = encrypted0;
        init1 = encrypted1;
        init2 = encrypted2;
        init3 = encrypted3;
      }

      return decrypted;
    };

    /**
     * The `Decrypter` class that manages decryption of AES
     * data through `AsyncStream` objects and the `decrypt`
     * function
     *
     * @param {Uint8Array} encrypted the encrypted bytes
     * @param {Uint32Array} key the bytes of the decryption key
     * @param {Uint32Array} initVector the initialization vector (IV) to
     * @param {Function} done the function to run when done
     * @class Decrypter
     */

    var Decrypter = function () {
      function Decrypter(encrypted, key, initVector, done) {
        classCallCheck(this, Decrypter);

        var step = Decrypter.STEP;
        var encrypted32 = new Int32Array(encrypted.buffer);
        var decrypted = new Uint8Array(encrypted.byteLength);
        var i = 0;

        this.asyncStream_ = new AsyncStream();

        // split up the encryption job and do the individual chunks asynchronously
        this.asyncStream_.push(this.decryptChunk_(encrypted32.subarray(i, i + step), key, initVector, decrypted));
        for (i = step; i < encrypted32.length; i += step) {
          initVector = new Uint32Array([ntoh(encrypted32[i - 4]), ntoh(encrypted32[i - 3]), ntoh(encrypted32[i - 2]), ntoh(encrypted32[i - 1])]);
          this.asyncStream_.push(this.decryptChunk_(encrypted32.subarray(i, i + step), key, initVector, decrypted));
        }
        // invoke the done() callback when everything is finished
        this.asyncStream_.push(function () {
          // remove pkcs#7 padding from the decrypted bytes
          done(null, unpad(decrypted));
        });
      }

      /**
       * a getter for step the maximum number of bytes to process at one time
       *
       * @return {Number} the value of step 32000
       */

      /**
       * @private
       */
      Decrypter.prototype.decryptChunk_ = function decryptChunk_(encrypted, key, initVector, decrypted) {
        return function () {
          var bytes = decrypt(encrypted, key, initVector);

          decrypted.set(bytes, encrypted.byteOffset);
        };
      };

      createClass(Decrypter, null, [{
        key: 'STEP',
        get: function get$$1() {
          // 4 * 8000;
          return 32000;
        }
      }]);
      return Decrypter;
    }();

    /**
     * @file bin-utils.js
     */

    /**
     * Creates an object for sending to a web worker modifying properties that are TypedArrays
     * into a new object with seperated properties for the buffer, byteOffset, and byteLength.
     *
     * @param {Object} message
     *        Object of properties and values to send to the web worker
     * @return {Object}
     *         Modified message with TypedArray values expanded
     * @function createTransferableMessage
     */
    var createTransferableMessage = function createTransferableMessage(message) {
      var transferable = {};

      Object.keys(message).forEach(function (key) {
        var value = message[key];

        if (ArrayBuffer.isView(value)) {
          transferable[key] = {
            bytes: value.buffer,
            byteOffset: value.byteOffset,
            byteLength: value.byteLength
          };
        } else {
          transferable[key] = value;
        }
      });

      return transferable;
    };

    /**
     * Our web worker interface so that things can talk to aes-decrypter
     * that will be running in a web worker. the scope is passed to this by
     * webworkify.
     *
     * @param {Object} self
     *        the scope for the web worker
     */
    var DecrypterWorker = function DecrypterWorker(self) {
      self.onmessage = function (event) {
        var data = event.data;
        var encrypted = new Uint8Array(data.encrypted.bytes, data.encrypted.byteOffset, data.encrypted.byteLength);
        var key = new Uint32Array(data.key.bytes, data.key.byteOffset, data.key.byteLength / 4);
        var iv = new Uint32Array(data.iv.bytes, data.iv.byteOffset, data.iv.byteLength / 4);

        /* eslint-disable no-new, handle-callback-err */
        new Decrypter(encrypted, key, iv, function (err, bytes) {
          self.postMessage(createTransferableMessage({
            source: data.source,
            decrypted: bytes
          }), [bytes.buffer]);
        });
        /* eslint-enable */
      };
    };

    var decrypterWorker = new DecrypterWorker(self);

    return decrypterWorker;
  }();
});

/**
 * Convert the properties of an HLS track into an audioTrackKind.
 *
 * @private
 */
var audioTrackKind_ = function audioTrackKind_(properties) {
  var kind = properties.default ? 'main' : 'alternative';

  if (properties.characteristics && properties.characteristics.indexOf('public.accessibility.describes-video') >= 0) {
    kind = 'main-desc';
  }

  return kind;
};

/**
 * Pause provided segment loader and playlist loader if active
 *
 * @param {SegmentLoader} segmentLoader
 *        SegmentLoader to pause
 * @param {Object} mediaType
 *        Active media type
 * @function stopLoaders
 */
var stopLoaders = function stopLoaders(segmentLoader, mediaType) {
  segmentLoader.abort();
  segmentLoader.pause();

  if (mediaType && mediaType.activePlaylistLoader) {
    mediaType.activePlaylistLoader.pause();
    mediaType.activePlaylistLoader = null;
  }
};

/**
 * Start loading provided segment loader and playlist loader
 *
 * @param {PlaylistLoader} playlistLoader
 *        PlaylistLoader to start loading
 * @param {Object} mediaType
 *        Active media type
 * @function startLoaders
 */
var startLoaders = function startLoaders(playlistLoader, mediaType) {
  // Segment loader will be started after `loadedmetadata` or `loadedplaylist` from the
  // playlist loader
  mediaType.activePlaylistLoader = playlistLoader;
  playlistLoader.load();
};

/**
 * Returns a function to be called when the media group changes. It performs a
 * non-destructive (preserve the buffer) resync of the SegmentLoader. This is because a
 * change of group is merely a rendition switch of the same content at another encoding,
 * rather than a change of content, such as switching audio from English to Spanish.
 *
 * @param {String} type
 *        MediaGroup type
 * @param {Object} settings
 *        Object containing required information for media groups
 * @return {Function}
 *         Handler for a non-destructive resync of SegmentLoader when the active media
 *         group changes.
 * @function onGroupChanged
 */
var onGroupChanged = function onGroupChanged(type, settings) {
  return function () {
    var _settings$segmentLoad = settings.segmentLoaders,
        segmentLoader = _settings$segmentLoad[type],
        mainSegmentLoader = _settings$segmentLoad.main,
        mediaType = settings.mediaTypes[type];

    var activeTrack = mediaType.activeTrack();
    var activeGroup = mediaType.activeGroup(activeTrack);
    var previousActiveLoader = mediaType.activePlaylistLoader;

    stopLoaders(segmentLoader, mediaType);

    if (!activeGroup) {
      // there is no group active
      return;
    }

    if (!activeGroup.playlistLoader) {
      if (previousActiveLoader) {
        // The previous group had a playlist loader but the new active group does not
        // this means we are switching from demuxed to muxed audio. In this case we want to
        // do a destructive reset of the main segment loader and not restart the audio
        // loaders.
        mainSegmentLoader.resetEverything();
      }
      return;
    }

    // Non-destructive resync
    segmentLoader.resyncLoader();

    startLoaders(activeGroup.playlistLoader, mediaType);
  };
};

/**
 * Returns a function to be called when the media track changes. It performs a
 * destructive reset of the SegmentLoader to ensure we start loading as close to
 * currentTime as possible.
 *
 * @param {String} type
 *        MediaGroup type
 * @param {Object} settings
 *        Object containing required information for media groups
 * @return {Function}
 *         Handler for a destructive reset of SegmentLoader when the active media
 *         track changes.
 * @function onTrackChanged
 */
var onTrackChanged = function onTrackChanged(type, settings) {
  return function () {
    var _settings$segmentLoad2 = settings.segmentLoaders,
        segmentLoader = _settings$segmentLoad2[type],
        mainSegmentLoader = _settings$segmentLoad2.main,
        mediaType = settings.mediaTypes[type];

    var activeTrack = mediaType.activeTrack();
    var activeGroup = mediaType.activeGroup(activeTrack);
    var previousActiveLoader = mediaType.activePlaylistLoader;

    stopLoaders(segmentLoader, mediaType);

    if (!activeGroup) {
      // there is no group active so we do not want to restart loaders
      return;
    }

    if (!activeGroup.playlistLoader) {
      // when switching from demuxed audio/video to muxed audio/video (noted by no playlist
      // loader for the audio group), we want to do a destructive reset of the main segment
      // loader and not restart the audio loaders
      mainSegmentLoader.resetEverything();
      return;
    }

    if (previousActiveLoader === activeGroup.playlistLoader) {
      // Nothing has actually changed. This can happen because track change events can fire
      // multiple times for a "single" change. One for enabling the new active track, and
      // one for disabling the track that was active
      startLoaders(activeGroup.playlistLoader, mediaType);
      return;
    }

    if (segmentLoader.track) {
      // For WebVTT, set the new text track in the segmentloader
      segmentLoader.track(activeTrack);
    }

    // destructive reset
    segmentLoader.resetEverything();

    startLoaders(activeGroup.playlistLoader, mediaType);
  };
};

var onError = {
  /**
   * Returns a function to be called when a SegmentLoader or PlaylistLoader encounters
   * an error.
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @return {Function}
   *         Error handler. Logs warning (or error if the playlist is blacklisted) to
   *         console and switches back to default audio track.
   * @function onError.AUDIO
   */
  AUDIO: function AUDIO(type, settings) {
    return function () {
      var segmentLoader = settings.segmentLoaders[type],
          mediaType = settings.mediaTypes[type],
          blacklistCurrentPlaylist = settings.blacklistCurrentPlaylist;


      stopLoaders(segmentLoader, mediaType);

      // switch back to default audio track
      var activeTrack = mediaType.activeTrack();
      var activeGroup = mediaType.activeGroup();
      var id = (activeGroup.filter(function (group) {
        return group.default;
      })[0] || activeGroup[0]).id;
      var defaultTrack = mediaType.tracks[id];

      if (activeTrack === defaultTrack) {
        // Default track encountered an error. All we can do now is blacklist the current
        // rendition and hope another will switch audio groups
        blacklistCurrentPlaylist({
          message: 'Problem encountered loading the default audio track.'
        });
        return;
      }

      videojs.log.warn('Problem encountered loading the alternate audio track.' + 'Switching back to default.');

      for (var trackId in mediaType.tracks) {
        mediaType.tracks[trackId].enabled = mediaType.tracks[trackId] === defaultTrack;
      }

      mediaType.onTrackChanged();
    };
  },
  /**
   * Returns a function to be called when a SegmentLoader or PlaylistLoader encounters
   * an error.
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @return {Function}
   *         Error handler. Logs warning to console and disables the active subtitle track
   * @function onError.SUBTITLES
   */
  SUBTITLES: function SUBTITLES(type, settings) {
    return function () {
      var segmentLoader = settings.segmentLoaders[type],
          mediaType = settings.mediaTypes[type];


      videojs.log.warn('Problem encountered loading the subtitle track.' + 'Disabling subtitle track.');

      stopLoaders(segmentLoader, mediaType);

      var track = mediaType.activeTrack();

      if (track) {
        track.mode = 'disabled';
      }

      mediaType.onTrackChanged();
    };
  }
};

var setupListeners = {
  /**
   * Setup event listeners for audio playlist loader
   *
   * @param {String} type
   *        MediaGroup type
   * @param {PlaylistLoader|null} playlistLoader
   *        PlaylistLoader to register listeners on
   * @param {Object} settings
   *        Object containing required information for media groups
   * @function setupListeners.AUDIO
   */
  AUDIO: function AUDIO(type, playlistLoader, settings) {
    if (!playlistLoader) {
      // no playlist loader means audio will be muxed with the video
      return;
    }

    var tech = settings.tech,
        requestOptions = settings.requestOptions,
        segmentLoader = settings.segmentLoaders[type];


    playlistLoader.on('loadedmetadata', function () {
      var media = playlistLoader.media();

      segmentLoader.playlist(media, requestOptions);

      // if the video is already playing, or if this isn't a live video and preload
      // permits, start downloading segments
      if (!tech.paused() || media.endList && tech.preload() !== 'none') {
        segmentLoader.load();
      }
    });

    playlistLoader.on('loadedplaylist', function () {
      segmentLoader.playlist(playlistLoader.media(), requestOptions);

      // If the player isn't paused, ensure that the segment loader is running
      if (!tech.paused()) {
        segmentLoader.load();
      }
    });

    playlistLoader.on('error', onError[type](type, settings));
  },
  /**
   * Setup event listeners for subtitle playlist loader
   *
   * @param {String} type
   *        MediaGroup type
   * @param {PlaylistLoader|null} playlistLoader
   *        PlaylistLoader to register listeners on
   * @param {Object} settings
   *        Object containing required information for media groups
   * @function setupListeners.SUBTITLES
   */
  SUBTITLES: function SUBTITLES(type, playlistLoader, settings) {
    var tech = settings.tech,
        requestOptions = settings.requestOptions,
        segmentLoader = settings.segmentLoaders[type],
        mediaType = settings.mediaTypes[type];


    playlistLoader.on('loadedmetadata', function () {
      var media = playlistLoader.media();

      segmentLoader.playlist(media, requestOptions);
      segmentLoader.track(mediaType.activeTrack());

      // if the video is already playing, or if this isn't a live video and preload
      // permits, start downloading segments
      if (!tech.paused() || media.endList && tech.preload() !== 'none') {
        segmentLoader.load();
      }
    });

    playlistLoader.on('loadedplaylist', function () {
      segmentLoader.playlist(playlistLoader.media(), requestOptions);

      // If the player isn't paused, ensure that the segment loader is running
      if (!tech.paused()) {
        segmentLoader.load();
      }
    });

    playlistLoader.on('error', onError[type](type, settings));
  }
};

var initialize = {
  /**
   * Setup PlaylistLoaders and AudioTracks for the audio groups
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @function initialize.AUDIO
   */
  'AUDIO': function AUDIO(type, settings) {
    var hls = settings.hls,
        sourceType = settings.sourceType,
        segmentLoader = settings.segmentLoaders[type],
        requestOptions = settings.requestOptions,
        mediaGroups = settings.master.mediaGroups,
        _settings$mediaTypes$ = settings.mediaTypes[type],
        groups = _settings$mediaTypes$.groups,
        tracks = _settings$mediaTypes$.tracks,
        masterPlaylistLoader = settings.masterPlaylistLoader;

    // force a default if we have none

    if (!mediaGroups[type] || Object.keys(mediaGroups[type]).length === 0) {
      mediaGroups[type] = { main: { default: { default: true } } };
    }

    for (var groupId in mediaGroups[type]) {
      if (!groups[groupId]) {
        groups[groupId] = [];
      }

      // List of playlists that have an AUDIO attribute value matching the current
      // group ID

      for (var variantLabel in mediaGroups[type][groupId]) {
        var properties = mediaGroups[type][groupId][variantLabel];
        var playlistLoader = void 0;

        if (properties.resolvedUri) {
          playlistLoader = new PlaylistLoader(properties.resolvedUri, hls, requestOptions);
        } else if (properties.playlists && sourceType === 'dash') {
          playlistLoader = new DashPlaylistLoader(properties.playlists[0], hls, requestOptions, masterPlaylistLoader);
        } else {
          // no resolvedUri means the audio is muxed with the video when using this
          // audio track
          playlistLoader = null;
        }

        properties = videojs.mergeOptions({ id: variantLabel, playlistLoader: playlistLoader }, properties);

        setupListeners[type](type, properties.playlistLoader, settings);

        groups[groupId].push(properties);

        if (typeof tracks[variantLabel] === 'undefined') {
          var track = new videojs.AudioTrack({
            id: variantLabel,
            kind: audioTrackKind_(properties),
            enabled: false,
            language: properties.language,
            default: properties.default,
            label: variantLabel
          });

          tracks[variantLabel] = track;
        }
      }
    }

    // setup single error event handler for the segment loader
    segmentLoader.on('error', onError[type](type, settings));
  },
  /**
   * Setup PlaylistLoaders and TextTracks for the subtitle groups
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @function initialize.SUBTITLES
   */
  'SUBTITLES': function SUBTITLES(type, settings) {
    var tech = settings.tech,
        hls = settings.hls,
        sourceType = settings.sourceType,
        segmentLoader = settings.segmentLoaders[type],
        requestOptions = settings.requestOptions,
        mediaGroups = settings.master.mediaGroups,
        _settings$mediaTypes$2 = settings.mediaTypes[type],
        groups = _settings$mediaTypes$2.groups,
        tracks = _settings$mediaTypes$2.tracks,
        masterPlaylistLoader = settings.masterPlaylistLoader;


    for (var groupId in mediaGroups[type]) {
      if (!groups[groupId]) {
        groups[groupId] = [];
      }

      for (var variantLabel in mediaGroups[type][groupId]) {
        if (mediaGroups[type][groupId][variantLabel].forced) {
          // Subtitle playlists with the forced attribute are not selectable in Safari.
          // According to Apple's HLS Authoring Specification:
          //   If content has forced subtitles and regular subtitles in a given language,
          //   the regular subtitles track in that language MUST contain both the forced
          //   subtitles and the regular subtitles for that language.
          // Because of this requirement and that Safari does not add forced subtitles,
          // forced subtitles are skipped here to maintain consistent experience across
          // all platforms
          continue;
        }

        var properties = mediaGroups[type][groupId][variantLabel];

        var playlistLoader = void 0;

        if (sourceType === 'hls') {
          playlistLoader = new PlaylistLoader(properties.resolvedUri, hls, requestOptions);
        } else if (sourceType === 'dash') {
          playlistLoader = new DashPlaylistLoader(properties.playlists[0], hls, requestOptions, masterPlaylistLoader);
        }

        properties = videojs.mergeOptions({
          id: variantLabel,
          playlistLoader: playlistLoader
        }, properties);

        setupListeners[type](type, properties.playlistLoader, settings);

        groups[groupId].push(properties);

        if (typeof tracks[variantLabel] === 'undefined') {
          var track = tech.addRemoteTextTrack({
            id: variantLabel,
            kind: 'subtitles',
            default: properties.default && properties.autoselect,
            language: properties.language,
            label: variantLabel
          }, false).track;

          tracks[variantLabel] = track;
        }
      }
    }

    // setup single error event handler for the segment loader
    segmentLoader.on('error', onError[type](type, settings));
  },
  /**
   * Setup TextTracks for the closed-caption groups
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @function initialize['CLOSED-CAPTIONS']
   */
  'CLOSED-CAPTIONS': function CLOSEDCAPTIONS(type, settings) {
    var tech = settings.tech,
        mediaGroups = settings.master.mediaGroups,
        _settings$mediaTypes$3 = settings.mediaTypes[type],
        groups = _settings$mediaTypes$3.groups,
        tracks = _settings$mediaTypes$3.tracks;


    for (var groupId in mediaGroups[type]) {
      if (!groups[groupId]) {
        groups[groupId] = [];
      }

      for (var variantLabel in mediaGroups[type][groupId]) {
        var properties = mediaGroups[type][groupId][variantLabel];

        // We only support CEA608 captions for now, so ignore anything that
        // doesn't use a CCx INSTREAM-ID
        if (!properties.instreamId.match(/CC\d/)) {
          continue;
        }

        // No PlaylistLoader is required for Closed-Captions because the captions are
        // embedded within the video stream
        groups[groupId].push(videojs.mergeOptions({ id: variantLabel }, properties));

        if (typeof tracks[variantLabel] === 'undefined') {
          var track = tech.addRemoteTextTrack({
            id: properties.instreamId,
            kind: 'captions',
            default: properties.default && properties.autoselect,
            language: properties.language,
            label: variantLabel
          }, false).track;

          tracks[variantLabel] = track;
        }
      }
    }
  }
};

/**
 * Returns a function used to get the active group of the provided type
 *
 * @param {String} type
 *        MediaGroup type
 * @param {Object} settings
 *        Object containing required information for media groups
 * @return {Function}
 *         Function that returns the active media group for the provided type. Takes an
 *         optional parameter {TextTrack} track. If no track is provided, a list of all
 *         variants in the group, otherwise the variant corresponding to the provided
 *         track is returned.
 * @function activeGroup
 */
var activeGroup = function activeGroup(type, settings) {
  return function (track) {
    var masterPlaylistLoader = settings.masterPlaylistLoader,
        groups = settings.mediaTypes[type].groups;


    var media = masterPlaylistLoader.media();

    if (!media) {
      return null;
    }

    var variants = null;

    if (media.attributes[type]) {
      variants = groups[media.attributes[type]];
    }

    variants = variants || groups.main;

    if (typeof track === 'undefined') {
      return variants;
    }

    if (track === null) {
      // An active track was specified so a corresponding group is expected. track === null
      // means no track is currently active so there is no corresponding group
      return null;
    }

    return variants.filter(function (props) {
      return props.id === track.id;
    })[0] || null;
  };
};

var activeTrack = {
  /**
   * Returns a function used to get the active track of type provided
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @return {Function}
   *         Function that returns the active media track for the provided type. Returns
   *         null if no track is active
   * @function activeTrack.AUDIO
   */
  AUDIO: function AUDIO(type, settings) {
    return function () {
      var tracks = settings.mediaTypes[type].tracks;


      for (var id in tracks) {
        if (tracks[id].enabled) {
          return tracks[id];
        }
      }

      return null;
    };
  },
  /**
   * Returns a function used to get the active track of type provided
   *
   * @param {String} type
   *        MediaGroup type
   * @param {Object} settings
   *        Object containing required information for media groups
   * @return {Function}
   *         Function that returns the active media track for the provided type. Returns
   *         null if no track is active
   * @function activeTrack.SUBTITLES
   */
  SUBTITLES: function SUBTITLES(type, settings) {
    return function () {
      var tracks = settings.mediaTypes[type].tracks;


      for (var id in tracks) {
        if (tracks[id].mode === 'showing') {
          return tracks[id];
        }
      }

      return null;
    };
  }
};

/**
 * Setup PlaylistLoaders and Tracks for media groups (Audio, Subtitles,
 * Closed-Captions) specified in the master manifest.
 *
 * @param {Object} settings
 *        Object containing required information for setting up the media groups
 * @param {SegmentLoader} settings.segmentLoaders.AUDIO
 *        Audio segment loader
 * @param {SegmentLoader} settings.segmentLoaders.SUBTITLES
 *        Subtitle segment loader
 * @param {SegmentLoader} settings.segmentLoaders.main
 *        Main segment loader
 * @param {Tech} settings.tech
 *        The tech of the player
 * @param {Object} settings.requestOptions
 *        XHR request options used by the segment loaders
 * @param {PlaylistLoader} settings.masterPlaylistLoader
 *        PlaylistLoader for the master source
 * @param {HlsHandler} settings.hls
 *        HLS SourceHandler
 * @param {Object} settings.master
 *        The parsed master manifest
 * @param {Object} settings.mediaTypes
 *        Object to store the loaders, tracks, and utility methods for each media type
 * @param {Function} settings.blacklistCurrentPlaylist
 *        Blacklists the current rendition and forces a rendition switch.
 * @function setupMediaGroups
 */
var setupMediaGroups = function setupMediaGroups(settings) {
  ['AUDIO', 'SUBTITLES', 'CLOSED-CAPTIONS'].forEach(function (type) {
    initialize[type](type, settings);
  });

  var mediaTypes = settings.mediaTypes,
      masterPlaylistLoader = settings.masterPlaylistLoader,
      tech = settings.tech,
      hls = settings.hls;

  // setup active group and track getters and change event handlers

  ['AUDIO', 'SUBTITLES'].forEach(function (type) {
    mediaTypes[type].activeGroup = activeGroup(type, settings);
    mediaTypes[type].activeTrack = activeTrack[type](type, settings);
    mediaTypes[type].onGroupChanged = onGroupChanged(type, settings);
    mediaTypes[type].onTrackChanged = onTrackChanged(type, settings);
  });

  // DO NOT enable the default subtitle or caption track.
  // DO enable the default audio track
  var audioGroup = mediaTypes.AUDIO.activeGroup();
  var groupId = (audioGroup.filter(function (group) {
    return group.default;
  })[0] || audioGroup[0]).id;

  mediaTypes.AUDIO.tracks[groupId].enabled = true;
  mediaTypes.AUDIO.onTrackChanged();

  masterPlaylistLoader.on('mediachange', function () {
    ['AUDIO', 'SUBTITLES'].forEach(function (type) {
      return mediaTypes[type].onGroupChanged();
    });
  });

  // custom audio track change event handler for usage event
  var onAudioTrackChanged = function onAudioTrackChanged() {
    mediaTypes.AUDIO.onTrackChanged();
    tech.trigger({ type: 'usage', name: 'hls-audio-change' });
  };

  tech.audioTracks().addEventListener('change', onAudioTrackChanged);
  tech.remoteTextTracks().addEventListener('change', mediaTypes.SUBTITLES.onTrackChanged);

  hls.on('dispose', function () {
    tech.audioTracks().removeEventListener('change', onAudioTrackChanged);
    tech.remoteTextTracks().removeEventListener('change', mediaTypes.SUBTITLES.onTrackChanged);
  });

  // clear existing audio tracks and add the ones we just created
  tech.clearTracks('audio');

  for (var id in mediaTypes.AUDIO.tracks) {
    tech.audioTracks().addTrack(mediaTypes.AUDIO.tracks[id]);
  }
};

/**
 * Creates skeleton object used to store the loaders, tracks, and utility methods for each
 * media type
 *
 * @return {Object}
 *         Object to store the loaders, tracks, and utility methods for each media type
 * @function createMediaTypes
 */
var createMediaTypes = function createMediaTypes() {
  var mediaTypes = {};

  ['AUDIO', 'SUBTITLES', 'CLOSED-CAPTIONS'].forEach(function (type) {
    mediaTypes[type] = {
      groups: {},
      tracks: {},
      activePlaylistLoader: null,
      activeGroup: noop,
      activeTrack: noop,
      onGroupChanged: noop,
      onTrackChanged: noop
    };
  });

  return mediaTypes;
};

/**
 * @file master-playlist-controller.js
 */

var ABORT_EARLY_BLACKLIST_SECONDS = 60 * 2;

var Hls = void 0;

// SegmentLoader stats that need to have each loader's
// values summed to calculate the final value
var loaderStats = ['mediaRequests', 'mediaRequestsAborted', 'mediaRequestsTimedout', 'mediaRequestsErrored', 'mediaTransferDuration', 'mediaBytesTransferred'];
var sumLoaderStat = function sumLoaderStat(stat) {
  return this.audioSegmentLoader_[stat] + this.mainSegmentLoader_[stat];
};

/**
 * the master playlist controller controller all interactons
 * between playlists and segmentloaders. At this time this mainly
 * involves a master playlist and a series of audio playlists
 * if they are available
 *
 * @class MasterPlaylistController
 * @extends videojs.EventTarget
 */
var MasterPlaylistController = function (_videojs$EventTarget) {
  inherits(MasterPlaylistController, _videojs$EventTarget);

  function MasterPlaylistController(options) {
    classCallCheck(this, MasterPlaylistController);

    var _this = possibleConstructorReturn(this, (MasterPlaylistController.__proto__ || Object.getPrototypeOf(MasterPlaylistController)).call(this));

    var url = options.url,
        handleManifestRedirects = options.handleManifestRedirects,
        withCredentials = options.withCredentials,
        tech = options.tech,
        bandwidth = options.bandwidth,
        externHls = options.externHls,
        useCueTags = options.useCueTags,
        blacklistDuration = options.blacklistDuration,
        enableLowInitialPlaylist = options.enableLowInitialPlaylist,
        sourceType = options.sourceType,
        seekTo = options.seekTo,
        cacheEncryptionKeys = options.cacheEncryptionKeys;


    if (!url) {
      throw new Error('A non-empty playlist URL is required');
    }

    Hls = externHls;

    _this.withCredentials = withCredentials;
    _this.tech_ = tech;
    _this.hls_ = tech.hls;
    _this.seekTo_ = seekTo;
    _this.sourceType_ = sourceType;
    _this.useCueTags_ = useCueTags;
    _this.blacklistDuration = blacklistDuration;
    _this.enableLowInitialPlaylist = enableLowInitialPlaylist;
    if (_this.useCueTags_) {
      _this.cueTagsTrack_ = _this.tech_.addTextTrack('metadata', 'ad-cues');
      _this.cueTagsTrack_.inBandMetadataTrackDispatchType = '';
    }

    _this.requestOptions_ = {
      withCredentials: withCredentials,
      handleManifestRedirects: handleManifestRedirects,
      timeout: null
    };

    _this.mediaTypes_ = createMediaTypes();

    _this.mediaSource = new videojs.MediaSource();

    // load the media source into the player
    _this.mediaSource.addEventListener('sourceopen', _this.handleSourceOpen_.bind(_this));

    _this.seekable_ = videojs.createTimeRanges();
    _this.hasPlayed_ = function () {
      return false;
    };

    _this.syncController_ = new SyncController(options);
    _this.segmentMetadataTrack_ = tech.addRemoteTextTrack({
      kind: 'metadata',
      label: 'segment-metadata'
    }, false).track;

    _this.decrypter_ = new Decrypter();
    _this.inbandTextTracks_ = {};

    var segmentLoaderSettings = {
      hls: _this.hls_,
      mediaSource: _this.mediaSource,
      currentTime: _this.tech_.currentTime.bind(_this.tech_),
      seekable: function seekable$$1() {
        return _this.seekable();
      },
      seeking: function seeking() {
        return _this.tech_.seeking();
      },
      duration: function duration$$1() {
        return _this.mediaSource.duration;
      },
      hasPlayed: function hasPlayed() {
        return _this.hasPlayed_();
      },
      goalBufferLength: function goalBufferLength() {
        return _this.goalBufferLength();
      },
      bandwidth: bandwidth,
      syncController: _this.syncController_,
      decrypter: _this.decrypter_,
      sourceType: _this.sourceType_,
      inbandTextTracks: _this.inbandTextTracks_,
      cacheEncryptionKeys: cacheEncryptionKeys
    };

    _this.masterPlaylistLoader_ = _this.sourceType_ === 'dash' ? new DashPlaylistLoader(url, _this.hls_, _this.requestOptions_) : new PlaylistLoader(url, _this.hls_, _this.requestOptions_);
    _this.setupMasterPlaylistLoaderListeners_();

    // setup segment loaders
    // combined audio/video or just video when alternate audio track is selected
    _this.mainSegmentLoader_ = new SegmentLoader(videojs.mergeOptions(segmentLoaderSettings, {
      segmentMetadataTrack: _this.segmentMetadataTrack_,
      loaderType: 'main'
    }), options);

    // alternate audio track
    _this.audioSegmentLoader_ = new SegmentLoader(videojs.mergeOptions(segmentLoaderSettings, {
      loaderType: 'audio'
    }), options);

    _this.subtitleSegmentLoader_ = new VTTSegmentLoader(videojs.mergeOptions(segmentLoaderSettings, {
      loaderType: 'vtt'
    }), options);

    _this.setupSegmentLoaderListeners_();

    // Create SegmentLoader stat-getters
    loaderStats.forEach(function (stat) {
      _this[stat + '_'] = sumLoaderStat.bind(_this, stat);
    });

    _this.logger_ = logger('MPC');

    _this.masterPlaylistLoader_.load();
    return _this;
  }

  /**
   * Register event handlers on the master playlist loader. A helper
   * function for construction time.
   *
   * @private
   */


  createClass(MasterPlaylistController, [{
    key: 'setupMasterPlaylistLoaderListeners_',
    value: function setupMasterPlaylistLoaderListeners_() {
      var _this2 = this;

      this.masterPlaylistLoader_.on('loadedmetadata', function () {
        var media = _this2.masterPlaylistLoader_.media();
        var requestTimeout = media.targetDuration * 1.5 * 1000;

        // If we don't have any more available playlists, we don't want to
        // timeout the request.
        if (isLowestEnabledRendition(_this2.masterPlaylistLoader_.master, _this2.masterPlaylistLoader_.media())) {
          _this2.requestOptions_.timeout = 0;
        } else {
          _this2.requestOptions_.timeout = requestTimeout;
        }

        // if this isn't a live video and preload permits, start
        // downloading segments
        if (media.endList && _this2.tech_.preload() !== 'none') {
          _this2.mainSegmentLoader_.playlist(media, _this2.requestOptions_);
          _this2.mainSegmentLoader_.load();
        }

        setupMediaGroups({
          sourceType: _this2.sourceType_,
          segmentLoaders: {
            AUDIO: _this2.audioSegmentLoader_,
            SUBTITLES: _this2.subtitleSegmentLoader_,
            main: _this2.mainSegmentLoader_
          },
          tech: _this2.tech_,
          requestOptions: _this2.requestOptions_,
          masterPlaylistLoader: _this2.masterPlaylistLoader_,
          hls: _this2.hls_,
          master: _this2.master(),
          mediaTypes: _this2.mediaTypes_,
          blacklistCurrentPlaylist: _this2.blacklistCurrentPlaylist.bind(_this2)
        });

        _this2.triggerPresenceUsage_(_this2.master(), media);

        try {
          _this2.setupSourceBuffers_();
        } catch (e) {
          videojs.log.warn('Failed to create SourceBuffers', e);
          return _this2.mediaSource.endOfStream('decode');
        }
        _this2.setupFirstPlay();

        if (!_this2.mediaTypes_.AUDIO.activePlaylistLoader || _this2.mediaTypes_.AUDIO.activePlaylistLoader.media()) {
          _this2.trigger('selectedinitialmedia');
        } else {
          // We must wait for the active audio playlist loader to
          // finish setting up before triggering this event so the
          // representations API and EME setup is correct
          _this2.mediaTypes_.AUDIO.activePlaylistLoader.one('loadedmetadata', function () {
            _this2.trigger('selectedinitialmedia');
          });
        }
      });

      this.masterPlaylistLoader_.on('loadedplaylist', function () {
        var updatedPlaylist = _this2.masterPlaylistLoader_.media();

        if (!updatedPlaylist) {
          // blacklist any variants that are not supported by the browser before selecting
          // an initial media as the playlist selectors do not consider browser support
          _this2.excludeUnsupportedVariants_();

          var selectedMedia = void 0;

          if (_this2.enableLowInitialPlaylist) {
            selectedMedia = _this2.selectInitialPlaylist();
          }

          if (!selectedMedia) {
            selectedMedia = _this2.selectPlaylist();
          }

          _this2.initialMedia_ = selectedMedia;
          _this2.masterPlaylistLoader_.media(_this2.initialMedia_);
          return;
        }

        if (_this2.useCueTags_) {
          _this2.updateAdCues_(updatedPlaylist);
        }

        // TODO: Create a new event on the PlaylistLoader that signals
        // that the segments have changed in some way and use that to
        // update the SegmentLoader instead of doing it twice here and
        // on `mediachange`
        _this2.mainSegmentLoader_.playlist(updatedPlaylist, _this2.requestOptions_);
        _this2.updateDuration();

        // If the player isn't paused, ensure that the segment loader is running,
        // as it is possible that it was temporarily stopped while waiting for
        // a playlist (e.g., in case the playlist errored and we re-requested it).
        if (!_this2.tech_.paused()) {
          _this2.mainSegmentLoader_.load();
          if (_this2.audioSegmentLoader_) {
            _this2.audioSegmentLoader_.load();
          }
        }

        if (!updatedPlaylist.endList) {
          var addSeekableRange = function addSeekableRange() {
            var seekable$$1 = _this2.seekable();

            if (seekable$$1.length !== 0) {
              _this2.mediaSource.addSeekableRange_(seekable$$1.start(0), seekable$$1.end(0));
            }
          };

          if (_this2.duration() !== Infinity) {
            var onDurationchange = function onDurationchange() {
              if (_this2.duration() === Infinity) {
                addSeekableRange();
              } else {
                _this2.tech_.one('durationchange', onDurationchange);
              }
            };

            _this2.tech_.one('durationchange', onDurationchange);
          } else {
            addSeekableRange();
          }
        }
      });

      this.masterPlaylistLoader_.on('error', function () {
        _this2.blacklistCurrentPlaylist(_this2.masterPlaylistLoader_.error);
      });

      this.masterPlaylistLoader_.on('mediachanging', function () {
        _this2.mainSegmentLoader_.abort();
        _this2.mainSegmentLoader_.pause();
      });

      this.masterPlaylistLoader_.on('mediachange', function () {
        var media = _this2.masterPlaylistLoader_.media();
        var requestTimeout = media.targetDuration * 1.5 * 1000;

        // If we don't have any more available playlists, we don't want to
        // timeout the request.
        if (isLowestEnabledRendition(_this2.masterPlaylistLoader_.master, _this2.masterPlaylistLoader_.media())) {
          _this2.requestOptions_.timeout = 0;
        } else {
          _this2.requestOptions_.timeout = requestTimeout;
        }

        // TODO: Create a new event on the PlaylistLoader that signals
        // that the segments have changed in some way and use that to
        // update the SegmentLoader instead of doing it twice here and
        // on `loadedplaylist`
        _this2.mainSegmentLoader_.playlist(media, _this2.requestOptions_);

        _this2.mainSegmentLoader_.load();

        _this2.tech_.trigger({
          type: 'mediachange',
          bubbles: true
        });
      });

      this.masterPlaylistLoader_.on('playlistunchanged', function () {
        var updatedPlaylist = _this2.masterPlaylistLoader_.media();
        var playlistOutdated = _this2.stuckAtPlaylistEnd_(updatedPlaylist);

        if (playlistOutdated) {
          // Playlist has stopped updating and we're stuck at its end. Try to
          // blacklist it and switch to another playlist in the hope that that
          // one is updating (and give the player a chance to re-adjust to the
          // safe live point).
          _this2.blacklistCurrentPlaylist({
            message: 'Playlist no longer updating.'
          });
          // useful for monitoring QoS
          _this2.tech_.trigger('playliststuck');
        }
      });

      this.masterPlaylistLoader_.on('renditiondisabled', function () {
        _this2.tech_.trigger({ type: 'usage', name: 'hls-rendition-disabled' });
      });
      this.masterPlaylistLoader_.on('renditionenabled', function () {
        _this2.tech_.trigger({ type: 'usage', name: 'hls-rendition-enabled' });
      });
    }

    /**
     * A helper function for triggerring presence usage events once per source
     *
     * @private
     */

  }, {
    key: 'triggerPresenceUsage_',
    value: function triggerPresenceUsage_(master, media) {
      var mediaGroups = master.mediaGroups || {};
      var defaultDemuxed = true;
      var audioGroupKeys = Object.keys(mediaGroups.AUDIO);

      for (var mediaGroup in mediaGroups.AUDIO) {
        for (var label in mediaGroups.AUDIO[mediaGroup]) {
          var properties = mediaGroups.AUDIO[mediaGroup][label];

          if (!properties.uri) {
            defaultDemuxed = false;
          }
        }
      }

      if (defaultDemuxed) {
        this.tech_.trigger({ type: 'usage', name: 'hls-demuxed' });
      }

      if (Object.keys(mediaGroups.SUBTITLES).length) {
        this.tech_.trigger({ type: 'usage', name: 'hls-webvtt' });
      }

      if (Hls.Playlist.isAes(media)) {
        this.tech_.trigger({ type: 'usage', name: 'hls-aes' });
      }

      if (Hls.Playlist.isFmp4(media)) {
        this.tech_.trigger({ type: 'usage', name: 'hls-fmp4' });
      }

      if (audioGroupKeys.length && Object.keys(mediaGroups.AUDIO[audioGroupKeys[0]]).length > 1) {
        this.tech_.trigger({ type: 'usage', name: 'hls-alternate-audio' });
      }

      if (this.useCueTags_) {
        this.tech_.trigger({ type: 'usage', name: 'hls-playlist-cue-tags' });
      }
    }
    /**
     * Register event handlers on the segment loaders. A helper function
     * for construction time.
     *
     * @private
     */

  }, {
    key: 'setupSegmentLoaderListeners_',
    value: function setupSegmentLoaderListeners_() {
      var _this3 = this;

      this.mainSegmentLoader_.on('bandwidthupdate', function () {
        var nextPlaylist = _this3.selectPlaylist();
        var currentPlaylist = _this3.masterPlaylistLoader_.media();
        var buffered = _this3.tech_.buffered();
        var forwardBuffer = buffered.length ? buffered.end(buffered.length - 1) - _this3.tech_.currentTime() : 0;

        var bufferLowWaterLine = _this3.bufferLowWaterLine();

        // If the playlist is live, then we want to not take low water line into account.
        // This is because in LIVE, the player plays 3 segments from the end of the
        // playlist, and if `BUFFER_LOW_WATER_LINE` is greater than the duration availble
        // in those segments, a viewer will never experience a rendition upswitch.
        if (!currentPlaylist.endList ||
        // For the same reason as LIVE, we ignore the low water line when the VOD
        // duration is below the max potential low water line
        _this3.duration() < Config.MAX_BUFFER_LOW_WATER_LINE ||
        // we want to switch down to lower resolutions quickly to continue playback, but
        nextPlaylist.attributes.BANDWIDTH < currentPlaylist.attributes.BANDWIDTH ||
        // ensure we have some buffer before we switch up to prevent us running out of
        // buffer while loading a higher rendition.
        forwardBuffer >= bufferLowWaterLine) {
          _this3.masterPlaylistLoader_.media(nextPlaylist);
        }

        _this3.tech_.trigger('bandwidthupdate');
      });
      this.mainSegmentLoader_.on('progress', function () {
        _this3.trigger('progress');
      });

      this.mainSegmentLoader_.on('error', function () {
        _this3.blacklistCurrentPlaylist(_this3.mainSegmentLoader_.error());
      });

      this.mainSegmentLoader_.on('syncinfoupdate', function () {
        _this3.onSyncInfoUpdate_();
      });

      this.mainSegmentLoader_.on('timestampoffset', function () {
        _this3.tech_.trigger({ type: 'usage', name: 'hls-timestamp-offset' });
      });
      this.audioSegmentLoader_.on('syncinfoupdate', function () {
        _this3.onSyncInfoUpdate_();
      });

      this.mainSegmentLoader_.on('ended', function () {
        _this3.onEndOfStream();
      });

      this.mainSegmentLoader_.on('earlyabort', function () {
        _this3.blacklistCurrentPlaylist({
          message: 'Aborted early because there isn\'t enough bandwidth to complete the ' + 'request without rebuffering.'
        }, ABORT_EARLY_BLACKLIST_SECONDS);
      });

      this.mainSegmentLoader_.on('reseteverything', function () {
        // If playing an MTS stream, a videojs.MediaSource is listening for
        // hls-reset to reset caption parsing state in the transmuxer
        _this3.tech_.trigger('hls-reset');
      });

      this.mainSegmentLoader_.on('segmenttimemapping', function (event) {
        // If playing an MTS stream in html, a videojs.MediaSource is listening for
        // hls-segment-time-mapping update its internal mapping of stream to display time
        _this3.tech_.trigger({
          type: 'hls-segment-time-mapping',
          mapping: event.mapping
        });
      });

      this.audioSegmentLoader_.on('ended', function () {
        _this3.onEndOfStream();
      });
    }
  }, {
    key: 'mediaSecondsLoaded_',
    value: function mediaSecondsLoaded_() {
      return Math.max(this.audioSegmentLoader_.mediaSecondsLoaded + this.mainSegmentLoader_.mediaSecondsLoaded);
    }

    /**
     * Call load on our SegmentLoaders
     */

  }, {
    key: 'load',
    value: function load() {
      this.mainSegmentLoader_.load();
      if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
        this.audioSegmentLoader_.load();
      }
      if (this.mediaTypes_.SUBTITLES.activePlaylistLoader) {
        this.subtitleSegmentLoader_.load();
      }
    }

    /**
     * Re-tune playback quality level for the current player
     * conditions without performing destructive actions, like
     * removing already buffered content
     *
     * @private
     */

  }, {
    key: 'smoothQualityChange_',
    value: function smoothQualityChange_() {
      var media = this.selectPlaylist();

      if (media !== this.masterPlaylistLoader_.media()) {
        this.masterPlaylistLoader_.media(media);

        this.mainSegmentLoader_.resetLoader();
        // don't need to reset audio as it is reset when media changes
      }
    }

    /**
     * Re-tune playback quality level for the current player
     * conditions. This method will perform destructive actions like removing
     * already buffered content in order to readjust the currently active
     * playlist quickly. This is good for manual quality changes
     *
     * @private
     */

  }, {
    key: 'fastQualityChange_',
    value: function fastQualityChange_() {
      var _this4 = this;

      var media = this.selectPlaylist();

      if (media === this.masterPlaylistLoader_.media()) {
        return;
      }

      this.masterPlaylistLoader_.media(media);

      // Delete all buffered data to allow an immediate quality switch, then seek to give
      // the browser a kick to remove any cached frames from the previous rendtion (.04 seconds
      // ahead is roughly the minimum that will accomplish this across a variety of content
      // in IE and Edge, but seeking in place is sufficient on all other browsers)
      // Edge/IE bug: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/14600375/
      // Chrome bug: https://bugs.chromium.org/p/chromium/issues/detail?id=651904
      this.mainSegmentLoader_.resetEverything(function () {
        // Since this is not a typical seek, we avoid the seekTo method which can cause segments
        // from the previously enabled rendition to load before the new playlist has finished loading
        if (videojs.browser.IE_VERSION || videojs.browser.IS_EDGE) {
          _this4.tech_.setCurrentTime(_this4.tech_.currentTime() + 0.04);
        } else {
          _this4.tech_.setCurrentTime(_this4.tech_.currentTime());
        }
      });

      // don't need to reset audio as it is reset when media changes
    }

    /**
     * Begin playback.
     */

  }, {
    key: 'play',
    value: function play() {
      if (this.setupFirstPlay()) {
        return;
      }

      if (this.tech_.ended()) {
        this.seekTo_(0);
      }

      if (this.hasPlayed_()) {
        this.load();
      }

      var seekable$$1 = this.tech_.seekable();

      // if the viewer has paused and we fell out of the live window,
      // seek forward to the live point
      if (this.tech_.duration() === Infinity) {
        if (this.tech_.currentTime() < seekable$$1.start(0)) {
          return this.seekTo_(seekable$$1.end(seekable$$1.length - 1));
        }
      }
    }

    /**
     * Seek to the latest media position if this is a live video and the
     * player and video are loaded and initialized.
     */

  }, {
    key: 'setupFirstPlay',
    value: function setupFirstPlay() {
      var _this5 = this;

      var media = this.masterPlaylistLoader_.media();

      // Check that everything is ready to begin buffering for the first call to play
      //  If 1) there is no active media
      //     2) the player is paused
      //     3) the first play has already been setup
      // then exit early
      if (!media || this.tech_.paused() || this.hasPlayed_()) {
        return false;
      }

      // when the video is a live stream
      if (!media.endList) {
        var seekable$$1 = this.seekable();

        if (!seekable$$1.length) {
          // without a seekable range, the player cannot seek to begin buffering at the live
          // point
          return false;
        }

        if (videojs.browser.IE_VERSION && this.tech_.readyState() === 0) {
          // IE11 throws an InvalidStateError if you try to set currentTime while the
          // readyState is 0, so it must be delayed until the tech fires loadedmetadata.
          this.tech_.one('loadedmetadata', function () {
            _this5.trigger('firstplay');
            _this5.seekTo_(seekable$$1.end(0));
            _this5.hasPlayed_ = function () {
              return true;
            };
          });

          return false;
        }

        // trigger firstplay to inform the source handler to ignore the next seek event
        this.trigger('firstplay');
        // seek to the live point
        this.seekTo_(seekable$$1.end(0));
      }

      this.hasPlayed_ = function () {
        return true;
      };
      // we can begin loading now that everything is ready
      this.load();
      return true;
    }

    /**
     * handle the sourceopen event on the MediaSource
     *
     * @private
     */

  }, {
    key: 'handleSourceOpen_',
    value: function handleSourceOpen_() {
      // Only attempt to create the source buffer if none already exist.
      // handleSourceOpen is also called when we are "re-opening" a source buffer
      // after `endOfStream` has been called (in response to a seek for instance)
      try {
        this.setupSourceBuffers_();
      } catch (e) {
        videojs.log.warn('Failed to create Source Buffers', e);
        return this.mediaSource.endOfStream('decode');
      }

      // if autoplay is enabled, begin playback. This is duplicative of
      // code in video.js but is required because play() must be invoked
      // *after* the media source has opened.
      if (this.tech_.autoplay()) {
        var playPromise = this.tech_.play();

        // Catch/silence error when a pause interrupts a play request
        // on browsers which return a promise
        if (typeof playPromise !== 'undefined' && typeof playPromise.then === 'function') {
          playPromise.then(null, function (e) {});
        }
      }

      this.trigger('sourceopen');
    }

    /**
     * Calls endOfStream on the media source when all active stream types have called
     * endOfStream
     *
     * @param {string} streamType
     *        Stream type of the segment loader that called endOfStream
     * @private
     */

  }, {
    key: 'onEndOfStream',
    value: function onEndOfStream() {
      var isEndOfStream = this.mainSegmentLoader_.ended_;

      if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
        // if the audio playlist loader exists, then alternate audio is active
        if (!this.mainSegmentLoader_.startingMedia_ || this.mainSegmentLoader_.startingMedia_.containsVideo) {
          // if we do not know if the main segment loader contains video yet or if we
          // definitively know the main segment loader contains video, then we need to wait
          // for both main and audio segment loaders to call endOfStream
          isEndOfStream = isEndOfStream && this.audioSegmentLoader_.ended_;
        } else {
          // otherwise just rely on the audio loader
          isEndOfStream = this.audioSegmentLoader_.ended_;
        }
      }

      if (!isEndOfStream) {
        return;
      }

      this.logger_('calling mediaSource.endOfStream()');
      // on chrome calling endOfStream can sometimes cause an exception,
      // even when the media source is in a valid state.
      try {
        this.mediaSource.endOfStream();
      } catch (e) {
        videojs.log.warn('Failed to call media source endOfStream', e);
      }
    }

    /**
     * Check if a playlist has stopped being updated
     * @param {Object} playlist the media playlist object
     * @return {boolean} whether the playlist has stopped being updated or not
     */

  }, {
    key: 'stuckAtPlaylistEnd_',
    value: function stuckAtPlaylistEnd_(playlist) {
      var seekable$$1 = this.seekable();

      if (!seekable$$1.length) {
        // playlist doesn't have enough information to determine whether we are stuck
        return false;
      }

      var expired = this.syncController_.getExpiredTime(playlist, this.mediaSource.duration);

      if (expired === null) {
        return false;
      }

      // does not use the safe live end to calculate playlist end, since we
      // don't want to say we are stuck while there is still content
      var absolutePlaylistEnd = Hls.Playlist.playlistEnd(playlist, expired);
      var currentTime = this.tech_.currentTime();
      var buffered = this.tech_.buffered();

      if (!buffered.length) {
        // return true if the playhead reached the absolute end of the playlist
        return absolutePlaylistEnd - currentTime <= SAFE_TIME_DELTA;
      }
      var bufferedEnd = buffered.end(buffered.length - 1);

      // return true if there is too little buffer left and buffer has reached absolute
      // end of playlist
      return bufferedEnd - currentTime <= SAFE_TIME_DELTA && absolutePlaylistEnd - bufferedEnd <= SAFE_TIME_DELTA;
    }

    /**
     * Blacklists a playlist when an error occurs for a set amount of time
     * making it unavailable for selection by the rendition selection algorithm
     * and then forces a new playlist (rendition) selection.
     *
     * @param {Object=} error an optional error that may include the playlist
     * to blacklist
     * @param {Number=} blacklistDuration an optional number of seconds to blacklist the
     * playlist
     */

  }, {
    key: 'blacklistCurrentPlaylist',
    value: function blacklistCurrentPlaylist() {
      var error = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
      var blacklistDuration = arguments[1];

      var currentPlaylist = void 0;
      var nextPlaylist = void 0;

      // If the `error` was generated by the playlist loader, it will contain
      // the playlist we were trying to load (but failed) and that should be
      // blacklisted instead of the currently selected playlist which is likely
      // out-of-date in this scenario
      currentPlaylist = error.playlist || this.masterPlaylistLoader_.media();

      blacklistDuration = blacklistDuration || error.blacklistDuration || this.blacklistDuration;

      // If there is no current playlist, then an error occurred while we were
      // trying to load the master OR while we were disposing of the tech
      if (!currentPlaylist) {
        this.error = error;

        try {
          return this.mediaSource.endOfStream('network');
        } catch (e) {
          return this.trigger('error');
        }
      }

      var isFinalRendition = this.masterPlaylistLoader_.master.playlists.filter(isEnabled).length === 1;
      var playlists = this.masterPlaylistLoader_.master.playlists;

      if (playlists.length === 1) {
        // Never blacklisting this playlist because it's the only playlist
        videojs.log.warn('Problem encountered with the current ' + 'HLS playlist. Trying again since it is the only playlist.');

        this.tech_.trigger('retryplaylist');
        return this.masterPlaylistLoader_.load(isFinalRendition);
      }

      if (isFinalRendition) {
        // Since we're on the final non-blacklisted playlist, and we're about to blacklist
        // it, instead of erring the player or retrying this playlist, clear out the current
        // blacklist. This allows other playlists to be attempted in case any have been
        // fixed.
        videojs.log.warn('Removing all playlists from the blacklist because the last ' + 'rendition is about to be blacklisted.');
        playlists.forEach(function (playlist) {
          if (playlist.excludeUntil !== Infinity) {
            delete playlist.excludeUntil;
          }
        });
        // Technically we are retrying a playlist, in that we are simply retrying a previous
        // playlist. This is needed for users relying on the retryplaylist event to catch a
        // case where the player might be stuck and looping through "dead" playlists.
        this.tech_.trigger('retryplaylist');
      }

      // Blacklist this playlist
      currentPlaylist.excludeUntil = Date.now() + blacklistDuration * 1000;
      this.tech_.trigger('blacklistplaylist');
      this.tech_.trigger({ type: 'usage', name: 'hls-rendition-blacklisted' });

      // Select a new playlist
      nextPlaylist = this.selectPlaylist();
      videojs.log.warn('Problem encountered with the current HLS playlist.' + (error.message ? ' ' + error.message : '') + ' Switching to another playlist.');

      return this.masterPlaylistLoader_.media(nextPlaylist, isFinalRendition);
    }

    /**
     * Pause all segment loaders
     */

  }, {
    key: 'pauseLoading',
    value: function pauseLoading() {
      this.mainSegmentLoader_.pause();
      if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
        this.audioSegmentLoader_.pause();
      }
      if (this.mediaTypes_.SUBTITLES.activePlaylistLoader) {
        this.subtitleSegmentLoader_.pause();
      }
    }

    /**
     * set the current time on all segment loaders
     *
     * @param {TimeRange} currentTime the current time to set
     * @return {TimeRange} the current time
     */

  }, {
    key: 'setCurrentTime',
    value: function setCurrentTime(currentTime) {
      var buffered = findRange(this.tech_.buffered(), currentTime);

      if (!(this.masterPlaylistLoader_ && this.masterPlaylistLoader_.media())) {
        // return immediately if the metadata is not ready yet
        return 0;
      }

      // it's clearly an edge-case but don't thrown an error if asked to
      // seek within an empty playlist
      if (!this.masterPlaylistLoader_.media().segments) {
        return 0;
      }

      // In flash playback, the segment loaders should be reset on every seek, even
      // in buffer seeks. If the seek location is already buffered, continue buffering as
      // usual
      // TODO: redo this comment
      if (buffered && buffered.length) {
        return currentTime;
      }

      // cancel outstanding requests so we begin buffering at the new
      // location
      this.mainSegmentLoader_.resetEverything();
      this.mainSegmentLoader_.abort();
      if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
        this.audioSegmentLoader_.resetEverything();
        this.audioSegmentLoader_.abort();
      }
      if (this.mediaTypes_.SUBTITLES.activePlaylistLoader) {
        this.subtitleSegmentLoader_.resetEverything();
        this.subtitleSegmentLoader_.abort();
      }

      // start segment loader loading in case they are paused
      this.load();
    }

    /**
     * get the current duration
     *
     * @return {TimeRange} the duration
     */

  }, {
    key: 'duration',
    value: function duration$$1() {
      if (!this.masterPlaylistLoader_) {
        return 0;
      }

      if (this.mediaSource) {
        return this.mediaSource.duration;
      }

      return Hls.Playlist.duration(this.masterPlaylistLoader_.media());
    }

    /**
     * check the seekable range
     *
     * @return {TimeRange} the seekable range
     */

  }, {
    key: 'seekable',
    value: function seekable$$1() {
      return this.seekable_;
    }
  }, {
    key: 'onSyncInfoUpdate_',
    value: function onSyncInfoUpdate_() {
      var mainSeekable = void 0;
      var audioSeekable = void 0;

      if (!this.masterPlaylistLoader_) {
        return;
      }

      var media = this.masterPlaylistLoader_.media();

      if (!media) {
        return;
      }

      var expired = this.syncController_.getExpiredTime(media, this.mediaSource.duration);

      if (expired === null) {
        // not enough information to update seekable
        return;
      }

      mainSeekable = Hls.Playlist.seekable(media, expired);

      if (mainSeekable.length === 0) {
        return;
      }

      if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
        media = this.mediaTypes_.AUDIO.activePlaylistLoader.media();
        expired = this.syncController_.getExpiredTime(media, this.mediaSource.duration);

        if (expired === null) {
          return;
        }

        audioSeekable = Hls.Playlist.seekable(media, expired);

        if (audioSeekable.length === 0) {
          return;
        }
      }

      var oldEnd = void 0;
      var oldStart = void 0;

      if (this.seekable_ && this.seekable_.length) {
        oldEnd = this.seekable_.end(0);
        oldStart = this.seekable_.start(0);
      }

      if (!audioSeekable) {
        // seekable has been calculated based on buffering video data so it
        // can be returned directly
        this.seekable_ = mainSeekable;
      } else if (audioSeekable.start(0) > mainSeekable.end(0) || mainSeekable.start(0) > audioSeekable.end(0)) {
        // seekables are pretty far off, rely on main
        this.seekable_ = mainSeekable;
      } else {
        this.seekable_ = videojs.createTimeRanges([[audioSeekable.start(0) > mainSeekable.start(0) ? audioSeekable.start(0) : mainSeekable.start(0), audioSeekable.end(0) < mainSeekable.end(0) ? audioSeekable.end(0) : mainSeekable.end(0)]]);
      }

      // seekable is the same as last time
      if (this.seekable_ && this.seekable_.length) {
        if (this.seekable_.end(0) === oldEnd && this.seekable_.start(0) === oldStart) {
          return;
        }
      }

      this.logger_('seekable updated [' + printableRange(this.seekable_) + ']');

      this.tech_.trigger('seekablechanged');
    }

    /**
     * Update the player duration
     */

  }, {
    key: 'updateDuration',
    value: function updateDuration() {
      var _this6 = this;

      var oldDuration = this.mediaSource.duration;
      var newDuration = Hls.Playlist.duration(this.masterPlaylistLoader_.media());
      var buffered = this.tech_.buffered();
      var setDuration = function setDuration() {
        // on firefox setting the duration may sometimes cause an exception
        // even if the media source is open and source buffers are not
        // updating, something about the media source being in an invalid state.
        _this6.logger_('Setting duration from ' + _this6.mediaSource.duration + ' => ' + newDuration);
        try {
          _this6.mediaSource.duration = newDuration;
        } catch (e) {
          videojs.log.warn('Failed to set media source duration', e);
        }
        _this6.tech_.trigger('durationchange');

        _this6.mediaSource.removeEventListener('sourceopen', setDuration);
      };

      if (buffered.length > 0) {
        newDuration = Math.max(newDuration, buffered.end(buffered.length - 1));
      }

      // if the duration has changed, invalidate the cached value
      if (oldDuration !== newDuration) {
        // update the duration
        if (this.mediaSource.readyState !== 'open') {
          this.mediaSource.addEventListener('sourceopen', setDuration);
        } else {
          setDuration();
        }
      }
    }

    /**
     * dispose of the MasterPlaylistController and everything
     * that it controls
     */

  }, {
    key: 'dispose',
    value: function dispose() {
      var _this7 = this;

      this.decrypter_.terminate();
      this.masterPlaylistLoader_.dispose();
      this.mainSegmentLoader_.dispose();

      ['AUDIO', 'SUBTITLES'].forEach(function (type) {
        var groups = _this7.mediaTypes_[type].groups;

        for (var id in groups) {
          groups[id].forEach(function (group) {
            if (group.playlistLoader) {
              group.playlistLoader.dispose();
            }
          });
        }
      });

      this.audioSegmentLoader_.dispose();
      this.subtitleSegmentLoader_.dispose();
    }

    /**
     * return the master playlist object if we have one
     *
     * @return {Object} the master playlist object that we parsed
     */

  }, {
    key: 'master',
    value: function master() {
      return this.masterPlaylistLoader_.master;
    }

    /**
     * return the currently selected playlist
     *
     * @return {Object} the currently selected playlist object that we parsed
     */

  }, {
    key: 'media',
    value: function media() {
      // playlist loader will not return media if it has not been fully loaded
      return this.masterPlaylistLoader_.media() || this.initialMedia_;
    }

    /**
     * setup our internal source buffers on our segment Loaders
     *
     * @private
     */

  }, {
    key: 'setupSourceBuffers_',
    value: function setupSourceBuffers_() {
      var media = this.masterPlaylistLoader_.media();
      var mimeTypes = void 0;

      // wait until a media playlist is available and the Media Source is
      // attached
      if (!media || this.mediaSource.readyState !== 'open') {
        return;
      }

      mimeTypes = mimeTypesForPlaylist(this.masterPlaylistLoader_.master, media);
      if (mimeTypes.length < 1) {
        this.error = 'No compatible SourceBuffer configuration for the variant stream:' + media.resolvedUri;
        return this.mediaSource.endOfStream('decode');
      }

      this.configureLoaderMimeTypes_(mimeTypes);
      // exclude any incompatible variant streams from future playlist
      // selection
      this.excludeIncompatibleVariants_(media);
    }
  }, {
    key: 'configureLoaderMimeTypes_',
    value: function configureLoaderMimeTypes_(mimeTypes) {
      // If the content is demuxed, we can't start appending segments to a source buffer
      // until both source buffers are set up, or else the browser may not let us add the
      // second source buffer (it will assume we are playing either audio only or video
      // only).
      var sourceBufferEmitter =
      // If there is more than one mime type
      mimeTypes.length > 1 &&
      // and the first mime type does not have muxed video and audio
      mimeTypes[0].indexOf(',') === -1 &&
      // and the two mime types are different (they can be the same in the case of audio
      // only with alternate audio)
      mimeTypes[0] !== mimeTypes[1] ?
      // then we want to wait on the second source buffer
      new videojs.EventTarget() :
      // otherwise there is no need to wait as the content is either audio only,
      // video only, or muxed content.
      null;

      this.mainSegmentLoader_.mimeType(mimeTypes[0], sourceBufferEmitter);
      if (mimeTypes[1]) {
        this.audioSegmentLoader_.mimeType(mimeTypes[1], sourceBufferEmitter);
      }
    }

    /**
     * Blacklists playlists with codecs that are unsupported by the browser.
     */

  }, {
    key: 'excludeUnsupportedVariants_',
    value: function excludeUnsupportedVariants_() {
      this.master().playlists.forEach(function (variant) {
        if (variant.attributes.CODECS && window$1.MediaSource && window$1.MediaSource.isTypeSupported && !window$1.MediaSource.isTypeSupported('video/mp4; codecs="' + mapLegacyAvcCodecs(variant.attributes.CODECS) + '"')) {
          variant.excludeUntil = Infinity;
        }
      });
    }

    /**
     * Blacklist playlists that are known to be codec or
     * stream-incompatible with the SourceBuffer configuration. For
     * instance, Media Source Extensions would cause the video element to
     * stall waiting for video data if you switched from a variant with
     * video and audio to an audio-only one.
     *
     * @param {Object} media a media playlist compatible with the current
     * set of SourceBuffers. Variants in the current master playlist that
     * do not appear to have compatible codec or stream configurations
     * will be excluded from the default playlist selection algorithm
     * indefinitely.
     * @private
     */

  }, {
    key: 'excludeIncompatibleVariants_',
    value: function excludeIncompatibleVariants_(media) {
      var codecCount = 2;
      var videoCodec = null;
      var codecs = void 0;

      if (media.attributes.CODECS) {
        codecs = parseCodecs(media.attributes.CODECS);
        videoCodec = codecs.videoCodec;
        codecCount = codecs.codecCount;
      }

      this.master().playlists.forEach(function (variant) {
        var variantCodecs = {
          codecCount: 2,
          videoCodec: null
        };

        if (variant.attributes.CODECS) {
          variantCodecs = parseCodecs(variant.attributes.CODECS);
        }

        // if the streams differ in the presence or absence of audio or
        // video, they are incompatible
        if (variantCodecs.codecCount !== codecCount) {
          variant.excludeUntil = Infinity;
        }

        // if h.264 is specified on the current playlist, some flavor of
        // it must be specified on all compatible variants
        if (variantCodecs.videoCodec !== videoCodec) {
          variant.excludeUntil = Infinity;
        }
      });
    }
  }, {
    key: 'updateAdCues_',
    value: function updateAdCues_(media) {
      var offset = 0;
      var seekable$$1 = this.seekable();

      if (seekable$$1.length) {
        offset = seekable$$1.start(0);
      }

      updateAdCues(media, this.cueTagsTrack_, offset);
    }

    /**
     * Calculates the desired forward buffer length based on current time
     *
     * @return {Number} Desired forward buffer length in seconds
     */

  }, {
    key: 'goalBufferLength',
    value: function goalBufferLength() {
      var currentTime = this.tech_.currentTime();
      var initial = Config.GOAL_BUFFER_LENGTH;
      var rate = Config.GOAL_BUFFER_LENGTH_RATE;
      var max = Math.max(initial, Config.MAX_GOAL_BUFFER_LENGTH);

      return Math.min(initial + currentTime * rate, max);
    }

    /**
     * Calculates the desired buffer low water line based on current time
     *
     * @return {Number} Desired buffer low water line in seconds
     */

  }, {
    key: 'bufferLowWaterLine',
    value: function bufferLowWaterLine() {
      var currentTime = this.tech_.currentTime();
      var initial = Config.BUFFER_LOW_WATER_LINE;
      var rate = Config.BUFFER_LOW_WATER_LINE_RATE;
      var max = Math.max(initial, Config.MAX_BUFFER_LOW_WATER_LINE);

      return Math.min(initial + currentTime * rate, max);
    }
  }]);
  return MasterPlaylistController;
}(videojs.EventTarget);

/**
 * Returns a function that acts as the Enable/disable playlist function.
 *
 * @param {PlaylistLoader} loader - The master playlist loader
 * @param {String} playlistUri - uri of the playlist
 * @param {Function} changePlaylistFn - A function to be called after a
 * playlist's enabled-state has been changed. Will NOT be called if a
 * playlist's enabled-state is unchanged
 * @param {Boolean=} enable - Value to set the playlist enabled-state to
 * or if undefined returns the current enabled-state for the playlist
 * @return {Function} Function for setting/getting enabled
 */
var enableFunction = function enableFunction(loader, playlistUri, changePlaylistFn) {
  return function (enable) {
    var playlist = loader.master.playlists[playlistUri];
    var incompatible = isIncompatible(playlist);
    var currentlyEnabled = isEnabled(playlist);

    if (typeof enable === 'undefined') {
      return currentlyEnabled;
    }

    if (enable) {
      delete playlist.disabled;
    } else {
      playlist.disabled = true;
    }

    if (enable !== currentlyEnabled && !incompatible) {
      // Ensure the outside world knows about our changes
      changePlaylistFn();
      if (enable) {
        loader.trigger('renditionenabled');
      } else {
        loader.trigger('renditiondisabled');
      }
    }
    return enable;
  };
};

/**
 * The representation object encapsulates the publicly visible information
 * in a media playlist along with a setter/getter-type function (enabled)
 * for changing the enabled-state of a particular playlist entry
 *
 * @class Representation
 */

var Representation = function Representation(hlsHandler, playlist, id) {
  classCallCheck(this, Representation);
  var mpc = hlsHandler.masterPlaylistController_,
      smoothQualityChange = hlsHandler.options_.smoothQualityChange;
  // Get a reference to a bound version of the quality change function

  var changeType = smoothQualityChange ? 'smooth' : 'fast';
  var qualityChangeFunction = mpc[changeType + 'QualityChange_'].bind(mpc);

  // some playlist attributes are optional
  if (playlist.attributes.RESOLUTION) {
    var resolution = playlist.attributes.RESOLUTION;

    this.width = resolution.width;
    this.height = resolution.height;
  }

  this.bandwidth = playlist.attributes.BANDWIDTH;

  // The id is simply the ordinality of the media playlist
  // within the master playlist
  this.id = id;

  // Partially-apply the enableFunction to create a playlist-
  // specific variant
  this.enabled = enableFunction(hlsHandler.playlists, playlist.uri, qualityChangeFunction);
};

/**
 * A mixin function that adds the `representations` api to an instance
 * of the HlsHandler class
 * @param {HlsHandler} hlsHandler - An instance of HlsHandler to add the
 * representation API into
 */


var renditionSelectionMixin = function renditionSelectionMixin(hlsHandler) {
  var playlists = hlsHandler.playlists;

  // Add a single API-specific function to the HlsHandler instance
  hlsHandler.representations = function () {
    return playlists.master.playlists.filter(function (media) {
      return !isIncompatible(media);
    }).map(function (e, i) {
      return new Representation(hlsHandler, e, e.uri);
    });
  };
};

/**
 * @file playback-watcher.js
 *
 * Playback starts, and now my watch begins. It shall not end until my death. I shall
 * take no wait, hold no uncleared timeouts, father no bad seeks. I shall wear no crowns
 * and win no glory. I shall live and die at my post. I am the corrector of the underflow.
 * I am the watcher of gaps. I am the shield that guards the realms of seekable. I pledge
 * my life and honor to the Playback Watch, for this Player and all the Players to come.
 */

// Set of events that reset the playback-watcher time check logic and clear the timeout
var timerCancelEvents = ['seeking', 'seeked', 'pause', 'playing', 'error'];

/**
 * @class PlaybackWatcher
 */

var PlaybackWatcher = function () {
  /**
   * Represents an PlaybackWatcher object.
   * @constructor
   * @param {object} options an object that includes the tech and settings
   */
  function PlaybackWatcher(options) {
    var _this = this;

    classCallCheck(this, PlaybackWatcher);

    this.tech_ = options.tech;
    this.seekable = options.seekable;
    this.seekTo = options.seekTo;
    this.allowSeeksWithinUnsafeLiveWindow = options.allowSeeksWithinUnsafeLiveWindow;
    this.media = options.media;

    this.consecutiveUpdates = 0;
    this.lastRecordedTime = null;
    this.timer_ = null;
    this.checkCurrentTimeTimeout_ = null;
    this.logger_ = logger('PlaybackWatcher');

    this.logger_('initialize');

    var canPlayHandler = function canPlayHandler() {
      return _this.monitorCurrentTime_();
    };
    var waitingHandler = function waitingHandler() {
      return _this.techWaiting_();
    };
    var cancelTimerHandler = function cancelTimerHandler() {
      return _this.cancelTimer_();
    };
    var fixesBadSeeksHandler = function fixesBadSeeksHandler() {
      return _this.fixesBadSeeks_();
    };

    this.tech_.on('seekablechanged', fixesBadSeeksHandler);
    this.tech_.on('waiting', waitingHandler);
    this.tech_.on(timerCancelEvents, cancelTimerHandler);
    this.tech_.on('canplay', canPlayHandler);

    // Define the dispose function to clean up our events
    this.dispose = function () {
      _this.logger_('dispose');
      _this.tech_.off('seekablechanged', fixesBadSeeksHandler);
      _this.tech_.off('waiting', waitingHandler);
      _this.tech_.off(timerCancelEvents, cancelTimerHandler);
      _this.tech_.off('canplay', canPlayHandler);
      if (_this.checkCurrentTimeTimeout_) {
        window$1.clearTimeout(_this.checkCurrentTimeTimeout_);
      }
      _this.cancelTimer_();
    };
  }

  /**
   * Periodically check current time to see if playback stopped
   *
   * @private
   */


  createClass(PlaybackWatcher, [{
    key: 'monitorCurrentTime_',
    value: function monitorCurrentTime_() {
      this.checkCurrentTime_();

      if (this.checkCurrentTimeTimeout_) {
        window$1.clearTimeout(this.checkCurrentTimeTimeout_);
      }

      // 42 = 24 fps // 250 is what Webkit uses // FF uses 15
      this.checkCurrentTimeTimeout_ = window$1.setTimeout(this.monitorCurrentTime_.bind(this), 250);
    }

    /**
     * The purpose of this function is to emulate the "waiting" event on
     * browsers that do not emit it when they are waiting for more
     * data to continue playback
     *
     * @private
     */

  }, {
    key: 'checkCurrentTime_',
    value: function checkCurrentTime_() {
      if (this.tech_.seeking() && this.fixesBadSeeks_()) {
        this.consecutiveUpdates = 0;
        this.lastRecordedTime = this.tech_.currentTime();
        return;
      }

      if (this.tech_.paused() || this.tech_.seeking()) {
        return;
      }

      var currentTime = this.tech_.currentTime();
      var buffered = this.tech_.buffered();

      if (this.lastRecordedTime === currentTime && (!buffered.length || currentTime + SAFE_TIME_DELTA >= buffered.end(buffered.length - 1))) {
        // If current time is at the end of the final buffered region, then any playback
        // stall is most likely caused by buffering in a low bandwidth environment. The tech
        // should fire a `waiting` event in this scenario, but due to browser and tech
        // inconsistencies. Calling `techWaiting_` here allows us to simulate
        // responding to a native `waiting` event when the tech fails to emit one.
        return this.techWaiting_();
      }

      if (this.consecutiveUpdates >= 5 && currentTime === this.lastRecordedTime) {
        this.consecutiveUpdates++;
        this.waiting_();
      } else if (currentTime === this.lastRecordedTime) {
        this.consecutiveUpdates++;
      } else {
        this.consecutiveUpdates = 0;
        this.lastRecordedTime = currentTime;
      }
    }

    /**
     * Cancels any pending timers and resets the 'timeupdate' mechanism
     * designed to detect that we are stalled
     *
     * @private
     */

  }, {
    key: 'cancelTimer_',
    value: function cancelTimer_() {
      this.consecutiveUpdates = 0;

      if (this.timer_) {
        this.logger_('cancelTimer_');
        clearTimeout(this.timer_);
      }

      this.timer_ = null;
    }

    /**
     * Fixes situations where there's a bad seek
     *
     * @return {Boolean} whether an action was taken to fix the seek
     * @private
     */

  }, {
    key: 'fixesBadSeeks_',
    value: function fixesBadSeeks_() {
      var seeking = this.tech_.seeking();

      if (!seeking) {
        return false;
      }

      var seekable = this.seekable();
      var currentTime = this.tech_.currentTime();
      var isAfterSeekableRange = this.afterSeekableWindow_(seekable, currentTime, this.media(), this.allowSeeksWithinUnsafeLiveWindow);
      var seekTo = void 0;

      if (isAfterSeekableRange) {
        var seekableEnd = seekable.end(seekable.length - 1);

        // sync to live point (if VOD, our seekable was updated and we're simply adjusting)
        seekTo = seekableEnd;
      }

      if (this.beforeSeekableWindow_(seekable, currentTime)) {
        var seekableStart = seekable.start(0);

        // sync to the beginning of the live window
        // provide a buffer of .1 seconds to handle rounding/imprecise numbers
        seekTo = seekableStart + SAFE_TIME_DELTA;
      }

      if (typeof seekTo !== 'undefined') {
        this.logger_('Trying to seek outside of seekable at time ' + currentTime + ' with ' + ('seekable range ' + printableRange(seekable) + '. Seeking to ') + (seekTo + '.'));

        this.seekTo(seekTo);
        return true;
      }

      return false;
    }

    /**
     * Handler for situations when we determine the player is waiting.
     *
     * @private
     */

  }, {
    key: 'waiting_',
    value: function waiting_() {
      if (this.techWaiting_()) {
        return;
      }

      // All tech waiting checks failed. Use last resort correction
      var currentTime = this.tech_.currentTime();
      var buffered = this.tech_.buffered();
      var currentRange = findRange(buffered, currentTime);

      // Sometimes the player can stall for unknown reasons within a contiguous buffered
      // region with no indication that anything is amiss (seen in Firefox). Seeking to
      // currentTime is usually enough to kickstart the player. This checks that the player
      // is currently within a buffered region before attempting a corrective seek.
      // Chrome does not appear to continue `timeupdate` events after a `waiting` event
      // until there is ~ 3 seconds of forward buffer available. PlaybackWatcher should also
      // make sure there is ~3 seconds of forward buffer before taking any corrective action
      // to avoid triggering an `unknownwaiting` event when the network is slow.
      if (currentRange.length && currentTime + 3 <= currentRange.end(0)) {
        this.cancelTimer_();
        this.seekTo(currentTime);

        this.logger_('Stopped at ' + currentTime + ' while inside a buffered region ' + ('[' + currentRange.start(0) + ' -> ' + currentRange.end(0) + ']. Attempting to resume ') + 'playback by seeking to the current time.');

        // unknown waiting corrections may be useful for monitoring QoS
        this.tech_.trigger({ type: 'usage', name: 'hls-unknown-waiting' });
        return;
      }
    }

    /**
     * Handler for situations when the tech fires a `waiting` event
     *
     * @return {Boolean}
     *         True if an action (or none) was needed to correct the waiting. False if no
     *         checks passed
     * @private
     */

  }, {
    key: 'techWaiting_',
    value: function techWaiting_() {
      var seekable = this.seekable();
      var currentTime = this.tech_.currentTime();

      if (this.tech_.seeking() && this.fixesBadSeeks_()) {
        // Tech is seeking or bad seek fixed, no action needed
        return true;
      }

      if (this.tech_.seeking() || this.timer_ !== null) {
        // Tech is seeking or already waiting on another action, no action needed
        return true;
      }

      if (this.beforeSeekableWindow_(seekable, currentTime)) {
        var livePoint = seekable.end(seekable.length - 1);

        this.logger_('Fell out of live window at time ' + currentTime + '. Seeking to ' + ('live point (seekable end) ' + livePoint));
        this.cancelTimer_();
        this.seekTo(livePoint);

        // live window resyncs may be useful for monitoring QoS
        this.tech_.trigger({ type: 'usage', name: 'hls-live-resync' });
        return true;
      }

      var buffered = this.tech_.buffered();
      var nextRange = findNextRange(buffered, currentTime);

      if (this.videoUnderflow_(nextRange, buffered, currentTime)) {
        // Even though the video underflowed and was stuck in a gap, the audio overplayed
        // the gap, leading currentTime into a buffered range. Seeking to currentTime
        // allows the video to catch up to the audio position without losing any audio
        // (only suffering ~3 seconds of frozen video and a pause in audio playback).
        this.cancelTimer_();
        this.seekTo(currentTime);

        // video underflow may be useful for monitoring QoS
        this.tech_.trigger({ type: 'usage', name: 'hls-video-underflow' });
        return true;
      }

      // check for gap
      if (nextRange.length > 0) {
        var difference = nextRange.start(0) - currentTime;

        this.logger_('Stopped at ' + currentTime + ', setting timer for ' + difference + ', seeking ' + ('to ' + nextRange.start(0)));

        this.timer_ = setTimeout(this.skipTheGap_.bind(this), difference * 1000, currentTime);
        return true;
      }

      // All checks failed. Returning false to indicate failure to correct waiting
      return false;
    }
  }, {
    key: 'afterSeekableWindow_',
    value: function afterSeekableWindow_(seekable, currentTime, playlist) {
      var allowSeeksWithinUnsafeLiveWindow = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;

      if (!seekable.length) {
        // we can't make a solid case if there's no seekable, default to false
        return false;
      }

      var allowedEnd = seekable.end(seekable.length - 1) + SAFE_TIME_DELTA;
      var isLive = !playlist.endList;

      if (isLive && allowSeeksWithinUnsafeLiveWindow) {
        allowedEnd = seekable.end(seekable.length - 1) + playlist.targetDuration * 3;
      }

      if (currentTime > allowedEnd) {
        return true;
      }

      return false;
    }
  }, {
    key: 'beforeSeekableWindow_',
    value: function beforeSeekableWindow_(seekable, currentTime) {
      if (seekable.length &&
      // can't fall before 0 and 0 seekable start identifies VOD stream
      seekable.start(0) > 0 && currentTime < seekable.start(0) - SAFE_TIME_DELTA) {
        return true;
      }

      return false;
    }
  }, {
    key: 'videoUnderflow_',
    value: function videoUnderflow_(nextRange, buffered, currentTime) {
      if (nextRange.length === 0) {
        // Even if there is no available next range, there is still a possibility we are
        // stuck in a gap due to video underflow.
        var gap = this.gapFromVideoUnderflow_(buffered, currentTime);

        if (gap) {
          this.logger_('Encountered a gap in video from ' + gap.start + ' to ' + gap.end + '. ' + ('Seeking to current time ' + currentTime));

          return true;
        }
      }

      return false;
    }

    /**
     * Timer callback. If playback still has not proceeded, then we seek
     * to the start of the next buffered region.
     *
     * @private
     */

  }, {
    key: 'skipTheGap_',
    value: function skipTheGap_(scheduledCurrentTime) {
      var buffered = this.tech_.buffered();
      var currentTime = this.tech_.currentTime();
      var nextRange = findNextRange(buffered, currentTime);

      this.cancelTimer_();

      if (nextRange.length === 0 || currentTime !== scheduledCurrentTime) {
        return;
      }

      this.logger_('skipTheGap_:', 'currentTime:', currentTime, 'scheduled currentTime:', scheduledCurrentTime, 'nextRange start:', nextRange.start(0));

      // only seek if we still have not played
      this.seekTo(nextRange.start(0) + TIME_FUDGE_FACTOR);

      this.tech_.trigger({ type: 'usage', name: 'hls-gap-skip' });
    }
  }, {
    key: 'gapFromVideoUnderflow_',
    value: function gapFromVideoUnderflow_(buffered, currentTime) {
      // At least in Chrome, if there is a gap in the video buffer, the audio will continue
      // playing for ~3 seconds after the video gap starts. This is done to account for
      // video buffer underflow/underrun (note that this is not done when there is audio
      // buffer underflow/underrun -- in that case the video will stop as soon as it
      // encounters the gap, as audio stalls are more noticeable/jarring to a user than
      // video stalls). The player's time will reflect the playthrough of audio, so the
      // time will appear as if we are in a buffered region, even if we are stuck in a
      // "gap."
      //
      // Example:
      // video buffer:   0 => 10.1, 10.2 => 20
      // audio buffer:   0 => 20
      // overall buffer: 0 => 10.1, 10.2 => 20
      // current time: 13
      //
      // Chrome's video froze at 10 seconds, where the video buffer encountered the gap,
      // however, the audio continued playing until it reached ~3 seconds past the gap
      // (13 seconds), at which point it stops as well. Since current time is past the
      // gap, findNextRange will return no ranges.
      //
      // To check for this issue, we see if there is a gap that starts somewhere within
      // a 3 second range (3 seconds +/- 1 second) back from our current time.
      var gaps = findGaps(buffered);

      for (var i = 0; i < gaps.length; i++) {
        var start = gaps.start(i);
        var end = gaps.end(i);

        // gap is starts no more than 4 seconds back
        if (currentTime - start < 4 && currentTime - start > 2) {
          return {
            start: start,
            end: end
          };
        }
      }

      return null;
    }
  }]);
  return PlaybackWatcher;
}();

var defaultOptions = {
  errorInterval: 30,
  getSource: function getSource(next) {
    var tech = this.tech({ IWillNotUseThisInPlugins: true });
    var sourceObj = tech.currentSource_;

    return next(sourceObj);
  }
};

/**
 * Main entry point for the plugin
 *
 * @param {Player} player a reference to a videojs Player instance
 * @param {Object} [options] an object with plugin options
 * @private
 */
var initPlugin = function initPlugin(player, options) {
  var lastCalled = 0;
  var seekTo = 0;
  var localOptions = videojs.mergeOptions(defaultOptions, options);

  player.ready(function () {
    player.trigger({ type: 'usage', name: 'hls-error-reload-initialized' });
  });

  /**
   * Player modifications to perform that must wait until `loadedmetadata`
   * has been triggered
   *
   * @private
   */
  var loadedMetadataHandler = function loadedMetadataHandler() {
    if (seekTo) {
      player.currentTime(seekTo);
    }
  };

  /**
   * Set the source on the player element, play, and seek if necessary
   *
   * @param {Object} sourceObj An object specifying the source url and mime-type to play
   * @private
   */
  var setSource = function setSource(sourceObj) {
    if (sourceObj === null || sourceObj === undefined) {
      return;
    }
    seekTo = player.duration() !== Infinity && player.currentTime() || 0;

    player.one('loadedmetadata', loadedMetadataHandler);

    player.src(sourceObj);
    player.trigger({ type: 'usage', name: 'hls-error-reload' });
    player.play();
  };

  /**
   * Attempt to get a source from either the built-in getSource function
   * or a custom function provided via the options
   *
   * @private
   */
  var errorHandler = function errorHandler() {
    // Do not attempt to reload the source if a source-reload occurred before
    // 'errorInterval' time has elapsed since the last source-reload
    if (Date.now() - lastCalled < localOptions.errorInterval * 1000) {
      player.trigger({ type: 'usage', name: 'hls-error-reload-canceled' });
      return;
    }

    if (!localOptions.getSource || typeof localOptions.getSource !== 'function') {
      videojs.log.error('ERROR: reloadSourceOnError - The option getSource must be a function!');
      return;
    }
    lastCalled = Date.now();

    return localOptions.getSource.call(player, setSource);
  };

  /**
   * Unbind any event handlers that were bound by the plugin
   *
   * @private
   */
  var cleanupEvents = function cleanupEvents() {
    player.off('loadedmetadata', loadedMetadataHandler);
    player.off('error', errorHandler);
    player.off('dispose', cleanupEvents);
  };

  /**
   * Cleanup before re-initializing the plugin
   *
   * @param {Object} [newOptions] an object with plugin options
   * @private
   */
  var reinitPlugin = function reinitPlugin(newOptions) {
    cleanupEvents();
    initPlugin(player, newOptions);
  };

  player.on('error', errorHandler);
  player.on('dispose', cleanupEvents);

  // Overwrite the plugin function so that we can correctly cleanup before
  // initializing the plugin
  player.reloadSourceOnError = reinitPlugin;
};

/**
 * Reload the source when an error is detected as long as there
 * wasn't an error previously within the last 30 seconds
 *
 * @param {Object} [options] an object with plugin options
 */
var reloadSourceOnError = function reloadSourceOnError(options) {
  initPlugin(this, options);
};

var version = "1.10.6";

// since VHS handles HLS and DASH (and in the future, more types), use * to capture all
videojs.use('*', function (player) {
  return {
    setSource: function setSource(srcObj, next) {
      // pass null as the first argument to indicate that the source is not rejected
      next(null, srcObj);
    },


    // VHS needs to know when seeks happen. For external seeks (generated at the player
    // level), this middleware will capture the action. For internal seeks (generated at
    // the tech level), we use a wrapped function so that we can handle it on our own
    // (specified elsewhere).
    setCurrentTime: function setCurrentTime(time) {
      if (player.vhs && player.currentSource().src === player.vhs.source_.src) {
        player.vhs.setCurrentTime(time);
      }

      return time;
    },


    // Sync VHS after play requests.
    // This specifically handles replay where the order of actions is
    // play, video element will seek to 0 (skipping the setCurrentTime middleware)
    // then triggers a play event.
    play: function play() {
      if (player.vhs && player.currentSource().src === player.vhs.source_.src) {
        player.vhs.setCurrentTime(player.tech_.currentTime());
      }
    }
  };
});

/**
 * @file videojs-http-streaming.js
 *
 * The main file for the HLS project.
 * License: https://github.com/videojs/videojs-http-streaming/blob/master/LICENSE
 */

var Hls$1 = {
  PlaylistLoader: PlaylistLoader,
  Playlist: Playlist,
  Decrypter: aesDecrypter.Decrypter,
  AsyncStream: aesDecrypter.AsyncStream,
  decrypt: aesDecrypter.decrypt,
  utils: utils,

  STANDARD_PLAYLIST_SELECTOR: lastBandwidthSelector,
  INITIAL_PLAYLIST_SELECTOR: lowestBitrateCompatibleVariantSelector,
  comparePlaylistBandwidth: comparePlaylistBandwidth,
  comparePlaylistResolution: comparePlaylistResolution,

  xhr: xhrFactory()
};

// Define getter/setters for config properites
['GOAL_BUFFER_LENGTH', 'MAX_GOAL_BUFFER_LENGTH', 'GOAL_BUFFER_LENGTH_RATE', 'BUFFER_LOW_WATER_LINE', 'MAX_BUFFER_LOW_WATER_LINE', 'BUFFER_LOW_WATER_LINE_RATE', 'BANDWIDTH_VARIANCE'].forEach(function (prop) {
  Object.defineProperty(Hls$1, prop, {
    get: function get$$1() {
      videojs.log.warn('using Hls.' + prop + ' is UNSAFE be sure you know what you are doing');
      return Config[prop];
    },
    set: function set$$1(value) {
      videojs.log.warn('using Hls.' + prop + ' is UNSAFE be sure you know what you are doing');

      if (typeof value !== 'number' || value < 0) {
        videojs.log.warn('value of Hls.' + prop + ' must be greater than or equal to 0');
        return;
      }

      Config[prop] = value;
    }
  });
});

var LOCAL_STORAGE_KEY = 'videojs-vhs';

var simpleTypeFromSourceType = function simpleTypeFromSourceType(type) {
  var mpegurlRE = /^(audio|video|application)\/(x-|vnd\.apple\.)?mpegurl/i;

  if (mpegurlRE.test(type)) {
    return 'hls';
  }

  var dashRE = /^application\/dash\+xml/i;

  if (dashRE.test(type)) {
    return 'dash';
  }

  return null;
};

/**
 * Updates the selectedIndex of the QualityLevelList when a mediachange happens in hls.
 *
 * @param {QualityLevelList} qualityLevels The QualityLevelList to update.
 * @param {PlaylistLoader} playlistLoader PlaylistLoader containing the new media info.
 * @function handleHlsMediaChange
 */
var handleHlsMediaChange = function handleHlsMediaChange(qualityLevels, playlistLoader) {
  var newPlaylist = playlistLoader.media();
  var selectedIndex = -1;

  for (var i = 0; i < qualityLevels.length; i++) {
    if (qualityLevels[i].id === newPlaylist.uri) {
      selectedIndex = i;
      break;
    }
  }

  qualityLevels.selectedIndex_ = selectedIndex;
  qualityLevels.trigger({
    selectedIndex: selectedIndex,
    type: 'change'
  });
};

/**
 * Adds quality levels to list once playlist metadata is available
 *
 * @param {QualityLevelList} qualityLevels The QualityLevelList to attach events to.
 * @param {Object} hls Hls object to listen to for media events.
 * @function handleHlsLoadedMetadata
 */
var handleHlsLoadedMetadata = function handleHlsLoadedMetadata(qualityLevels, hls) {
  hls.representations().forEach(function (rep) {
    qualityLevels.addQualityLevel(rep);
  });
  handleHlsMediaChange(qualityLevels, hls.playlists);
};

// HLS is a source handler, not a tech. Make sure attempts to use it
// as one do not cause exceptions.
Hls$1.canPlaySource = function () {
  return videojs.log.warn('HLS is no longer a tech. Please remove it from ' + 'your player\'s techOrder.');
};

var emeKeySystems = function emeKeySystems(keySystemOptions, videoPlaylist, audioPlaylist) {
  if (!keySystemOptions) {
    return keySystemOptions;
  }

  // upsert the content types based on the selected playlist
  var keySystemContentTypes = {};

  for (var keySystem in keySystemOptions) {
    keySystemContentTypes[keySystem] = {
      audioContentType: 'audio/mp4; codecs="' + audioPlaylist.attributes.CODECS + '"',
      videoContentType: 'video/mp4; codecs="' + videoPlaylist.attributes.CODECS + '"'
    };

    if (videoPlaylist.contentProtection && videoPlaylist.contentProtection[keySystem] && videoPlaylist.contentProtection[keySystem].pssh) {
      keySystemContentTypes[keySystem].pssh = videoPlaylist.contentProtection[keySystem].pssh;
    }

    // videojs-contrib-eme accepts the option of specifying: 'com.some.cdm': 'url'
    // so we need to prevent overwriting the URL entirely
    if (typeof keySystemOptions[keySystem] === 'string') {
      keySystemContentTypes[keySystem].url = keySystemOptions[keySystem];
    }
  }

  return videojs.mergeOptions(keySystemOptions, keySystemContentTypes);
};

var setupEmeOptions = function setupEmeOptions(hlsHandler) {
  if (hlsHandler.options_.sourceType !== 'dash') {
    return;
  }
  var player = videojs.players[hlsHandler.tech_.options_.playerId];

  if (player.eme) {
    var sourceOptions = emeKeySystems(hlsHandler.source_.keySystems, hlsHandler.playlists.media(), hlsHandler.masterPlaylistController_.mediaTypes_.AUDIO.activePlaylistLoader.media());

    if (sourceOptions) {
      player.currentSource().keySystems = sourceOptions;

      // works around https://bugs.chromium.org/p/chromium/issues/detail?id=895449
      if (player.eme.initializeMediaKeys) {
        player.eme.initializeMediaKeys();
      }
    }
  }
};

var getVhsLocalStorage = function getVhsLocalStorage() {
  if (!window.localStorage) {
    return null;
  }

  var storedObject = window.localStorage.getItem(LOCAL_STORAGE_KEY);

  if (!storedObject) {
    return null;
  }

  try {
    return JSON.parse(storedObject);
  } catch (e) {
    // someone may have tampered with the value
    return null;
  }
};

var updateVhsLocalStorage = function updateVhsLocalStorage(options) {
  if (!window.localStorage) {
    return false;
  }

  var objectToStore = getVhsLocalStorage();

  objectToStore = objectToStore ? videojs.mergeOptions(objectToStore, options) : options;

  try {
    window.localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(objectToStore));
  } catch (e) {
    // Throws if storage is full (e.g., always on iOS 5+ Safari private mode, where
    // storage is set to 0).
    // https://developer.mozilla.org/en-US/docs/Web/API/Storage/setItem#Exceptions
    // No need to perform any operation.
    return false;
  }

  return objectToStore;
};

/**
 * Whether the browser has built-in HLS support.
 */
Hls$1.supportsNativeHls = function () {
  var video = document.createElement('video');

  // native HLS is definitely not supported if HTML5 video isn't
  if (!videojs.getTech('Html5').isSupported()) {
    return false;
  }

  // HLS manifests can go by many mime-types
  var canPlay = [
  // Apple santioned
  'application/vnd.apple.mpegurl',
  // Apple sanctioned for backwards compatibility
  'audio/mpegurl',
  // Very common
  'audio/x-mpegurl',
  // Very common
  'application/x-mpegurl',
  // Included for completeness
  'video/x-mpegurl', 'video/mpegurl', 'application/mpegurl'];

  return canPlay.some(function (canItPlay) {
    return (/maybe|probably/i.test(video.canPlayType(canItPlay))
    );
  });
}();

Hls$1.supportsNativeDash = function () {
  if (!videojs.getTech('Html5').isSupported()) {
    return false;
  }

  return (/maybe|probably/i.test(document.createElement('video').canPlayType('application/dash+xml'))
  );
}();

Hls$1.supportsTypeNatively = function (type) {
  if (type === 'hls') {
    return Hls$1.supportsNativeHls;
  }

  if (type === 'dash') {
    return Hls$1.supportsNativeDash;
  }

  return false;
};

/**
 * HLS is a source handler, not a tech. Make sure attempts to use it
 * as one do not cause exceptions.
 */
Hls$1.isSupported = function () {
  return videojs.log.warn('HLS is no longer a tech. Please remove it from ' + 'your player\'s techOrder.');
};

var Component = videojs.getComponent('Component');

/**
 * The Hls Handler object, where we orchestrate all of the parts
 * of HLS to interact with video.js
 *
 * @class HlsHandler
 * @extends videojs.Component
 * @param {Object} source the soruce object
 * @param {Tech} tech the parent tech object
 * @param {Object} options optional and required options
 */

var HlsHandler = function (_Component) {
  inherits(HlsHandler, _Component);

  function HlsHandler(source, tech, options) {
    classCallCheck(this, HlsHandler);

    // tech.player() is deprecated but setup a reference to HLS for
    // backwards-compatibility
    var _this = possibleConstructorReturn(this, (HlsHandler.__proto__ || Object.getPrototypeOf(HlsHandler)).call(this, tech, options.hls));

    if (tech.options_ && tech.options_.playerId) {
      var _player = videojs(tech.options_.playerId);

      if (!_player.hasOwnProperty('hls')) {
        Object.defineProperty(_player, 'hls', {
          get: function get$$1() {
            videojs.log.warn('player.hls is deprecated. Use player.tech().hls instead.');
            tech.trigger({ type: 'usage', name: 'hls-player-access' });
            return _this;
          },
          configurable: true
        });
      }

      // Set up a reference to the HlsHandler from player.vhs. This allows users to start
      // migrating from player.tech_.hls... to player.vhs... for API access. Although this
      // isn't the most appropriate form of reference for video.js (since all APIs should
      // be provided through core video.js), it is a common pattern for plugins, and vhs
      // will act accordingly.
      _player.vhs = _this;
      // deprecated, for backwards compatibility
      _player.dash = _this;

      _this.player_ = _player;
    }

    _this.tech_ = tech;
    _this.source_ = source;
    _this.stats = {};
    _this.setOptions_();

    if (_this.options_.overrideNative && tech.overrideNativeAudioTracks && tech.overrideNativeVideoTracks) {
      tech.overrideNativeAudioTracks(true);
      tech.overrideNativeVideoTracks(true);
    } else if (_this.options_.overrideNative && (tech.featuresNativeVideoTracks || tech.featuresNativeAudioTracks)) {
      // overriding native HLS only works if audio tracks have been emulated
      // error early if we're misconfigured
      throw new Error('Overriding native HLS requires emulated tracks. ' + 'See https://git.io/vMpjB');
    }

    // listen for fullscreenchange events for this player so that we
    // can adjust our quality selection quickly
    _this.on(document, ['fullscreenchange', 'webkitfullscreenchange', 'mozfullscreenchange', 'MSFullscreenChange'], function (event) {
      var fullscreenElement = document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement;

      if (fullscreenElement && fullscreenElement.contains(_this.tech_.el())) {
        _this.masterPlaylistController_.smoothQualityChange_();
      }
    });

    // Handle seeking when looping - middleware doesn't handle this seek event from the tech
    _this.on(_this.tech_, 'seeking', function () {
      if (this.tech_.currentTime() === 0 && this.tech_.player_.loop()) {
        this.setCurrentTime(0);
      }
    });

    _this.on(_this.tech_, 'error', function () {
      if (this.masterPlaylistController_) {
        this.masterPlaylistController_.pauseLoading();
      }
    });

    _this.on(_this.tech_, 'play', _this.play);
    return _this;
  }

  createClass(HlsHandler, [{
    key: 'setOptions_',
    value: function setOptions_() {
      var _this2 = this;

      // defaults
      this.options_.withCredentials = this.options_.withCredentials || false;
      this.options_.handleManifestRedirects = this.options_.handleManifestRedirects || false;
      this.options_.limitRenditionByPlayerDimensions = this.options_.limitRenditionByPlayerDimensions === false ? false : true;
      this.options_.smoothQualityChange = this.options_.smoothQualityChange || false;
      this.options_.useBandwidthFromLocalStorage = typeof this.source_.useBandwidthFromLocalStorage !== 'undefined' ? this.source_.useBandwidthFromLocalStorage : this.options_.useBandwidthFromLocalStorage || false;
      this.options_.customTagParsers = this.options_.customTagParsers || [];
      this.options_.customTagMappers = this.options_.customTagMappers || [];
      this.options_.cacheEncryptionKeys = this.options_.cacheEncryptionKeys || false;

      if (typeof this.options_.blacklistDuration !== 'number') {
        this.options_.blacklistDuration = 5 * 60;
      }

      if (typeof this.options_.bandwidth !== 'number') {
        if (this.options_.useBandwidthFromLocalStorage) {
          var storedObject = getVhsLocalStorage();

          if (storedObject && storedObject.bandwidth) {
            this.options_.bandwidth = storedObject.bandwidth;
            this.tech_.trigger({ type: 'usage', name: 'hls-bandwidth-from-local-storage' });
          }
          if (storedObject && storedObject.throughput) {
            this.options_.throughput = storedObject.throughput;
            this.tech_.trigger({ type: 'usage', name: 'hls-throughput-from-local-storage' });
          }
        }
      }
      // if bandwidth was not set by options or pulled from local storage, start playlist
      // selection at a reasonable bandwidth
      if (typeof this.options_.bandwidth !== 'number') {
        this.options_.bandwidth = Config.INITIAL_BANDWIDTH;
      }

      // If the bandwidth number is unchanged from the initial setting
      // then this takes precedence over the enableLowInitialPlaylist option
      this.options_.enableLowInitialPlaylist = this.options_.enableLowInitialPlaylist && this.options_.bandwidth === Config.INITIAL_BANDWIDTH;

      // grab options passed to player.src
      ['withCredentials', 'limitRenditionByPlayerDimensions', 'bandwidth', 'smoothQualityChange', 'customTagParsers', 'customTagMappers', 'handleManifestRedirects', 'cacheEncryptionKeys'].forEach(function (option) {
        if (typeof _this2.source_[option] !== 'undefined') {
          _this2.options_[option] = _this2.source_[option];
        }
      });

      this.limitRenditionByPlayerDimensions = this.options_.limitRenditionByPlayerDimensions;
    }
    /**
     * called when player.src gets called, handle a new source
     *
     * @param {Object} src the source object to handle
     */

  }, {
    key: 'src',
    value: function src(_src, type) {
      var _this3 = this;

      // do nothing if the src is falsey
      if (!_src) {
        return;
      }
      this.setOptions_();
      // add master playlist controller options
      this.options_.url = this.source_.src;
      this.options_.tech = this.tech_;
      this.options_.externHls = Hls$1;
      this.options_.sourceType = simpleTypeFromSourceType(type);
      // Whenever we seek internally, we should update both the tech and call our own
      // setCurrentTime function. This is needed because "seeking" events aren't always
      // reliable. External seeks (via the player object) are handled via middleware.
      this.options_.seekTo = function (time) {
        _this3.tech_.setCurrentTime(time);
        _this3.setCurrentTime(time);
      };

      this.masterPlaylistController_ = new MasterPlaylistController(this.options_);
      this.playbackWatcher_ = new PlaybackWatcher(videojs.mergeOptions(this.options_, {
        seekable: function seekable$$1() {
          return _this3.seekable();
        },
        media: function media() {
          return _this3.masterPlaylistController_.media();
        }
      }));

      this.masterPlaylistController_.on('error', function () {
        var player = videojs.players[_this3.tech_.options_.playerId];

        player.error(_this3.masterPlaylistController_.error);
      });

      // `this` in selectPlaylist should be the HlsHandler for backwards
      // compatibility with < v2
      this.masterPlaylistController_.selectPlaylist = this.selectPlaylist ? this.selectPlaylist.bind(this) : Hls$1.STANDARD_PLAYLIST_SELECTOR.bind(this);

      this.masterPlaylistController_.selectInitialPlaylist = Hls$1.INITIAL_PLAYLIST_SELECTOR.bind(this);

      // re-expose some internal objects for backwards compatibility with < v2
      this.playlists = this.masterPlaylistController_.masterPlaylistLoader_;
      this.mediaSource = this.masterPlaylistController_.mediaSource;

      // Proxy assignment of some properties to the master playlist
      // controller. Using a custom property for backwards compatibility
      // with < v2
      Object.defineProperties(this, {
        selectPlaylist: {
          get: function get$$1() {
            return this.masterPlaylistController_.selectPlaylist;
          },
          set: function set$$1(selectPlaylist) {
            this.masterPlaylistController_.selectPlaylist = selectPlaylist.bind(this);
          }
        },
        throughput: {
          get: function get$$1() {
            return this.masterPlaylistController_.mainSegmentLoader_.throughput.rate;
          },
          set: function set$$1(throughput) {
            this.masterPlaylistController_.mainSegmentLoader_.throughput.rate = throughput;
            // By setting `count` to 1 the throughput value becomes the starting value
            // for the cumulative average
            this.masterPlaylistController_.mainSegmentLoader_.throughput.count = 1;
          }
        },
        bandwidth: {
          get: function get$$1() {
            return this.masterPlaylistController_.mainSegmentLoader_.bandwidth;
          },
          set: function set$$1(bandwidth) {
            this.masterPlaylistController_.mainSegmentLoader_.bandwidth = bandwidth;
            // setting the bandwidth manually resets the throughput counter
            // `count` is set to zero that current value of `rate` isn't included
            // in the cumulative average
            this.masterPlaylistController_.mainSegmentLoader_.throughput = {
              rate: 0,
              count: 0
            };
          }
        },
        /**
         * `systemBandwidth` is a combination of two serial processes bit-rates. The first
         * is the network bitrate provided by `bandwidth` and the second is the bitrate of
         * the entire process after that - decryption, transmuxing, and appending - provided
         * by `throughput`.
         *
         * Since the two process are serial, the overall system bandwidth is given by:
         *   sysBandwidth = 1 / (1 / bandwidth + 1 / throughput)
         */
        systemBandwidth: {
          get: function get$$1() {
            var invBandwidth = 1 / (this.bandwidth || 1);
            var invThroughput = void 0;

            if (this.throughput > 0) {
              invThroughput = 1 / this.throughput;
            } else {
              invThroughput = 0;
            }

            var systemBitrate = Math.floor(1 / (invBandwidth + invThroughput));

            return systemBitrate;
          },
          set: function set$$1() {
            videojs.log.error('The "systemBandwidth" property is read-only');
          }
        }
      });

      if (this.options_.bandwidth) {
        this.bandwidth = this.options_.bandwidth;
      }
      if (this.options_.throughput) {
        this.throughput = this.options_.throughput;
      }

      Object.defineProperties(this.stats, {
        bandwidth: {
          get: function get$$1() {
            return _this3.bandwidth || 0;
          },
          enumerable: true
        },
        mediaRequests: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaRequests_() || 0;
          },
          enumerable: true
        },
        mediaRequestsAborted: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaRequestsAborted_() || 0;
          },
          enumerable: true
        },
        mediaRequestsTimedout: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaRequestsTimedout_() || 0;
          },
          enumerable: true
        },
        mediaRequestsErrored: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaRequestsErrored_() || 0;
          },
          enumerable: true
        },
        mediaTransferDuration: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaTransferDuration_() || 0;
          },
          enumerable: true
        },
        mediaBytesTransferred: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaBytesTransferred_() || 0;
          },
          enumerable: true
        },
        mediaSecondsLoaded: {
          get: function get$$1() {
            return _this3.masterPlaylistController_.mediaSecondsLoaded_() || 0;
          },
          enumerable: true
        },
        buffered: {
          get: function get$$1() {
            return timeRangesToArray(_this3.tech_.buffered());
          },
          enumerable: true
        },
        currentTime: {
          get: function get$$1() {
            return _this3.tech_.currentTime();
          },
          enumerable: true
        },
        currentSource: {
          get: function get$$1() {
            return _this3.tech_.currentSource_;
          },
          enumerable: true
        },
        currentTech: {
          get: function get$$1() {
            return _this3.tech_.name_;
          },
          enumerable: true
        },
        duration: {
          get: function get$$1() {
            return _this3.tech_.duration();
          },
          enumerable: true
        },
        master: {
          get: function get$$1() {
            return _this3.playlists.master;
          },
          enumerable: true
        },
        playerDimensions: {
          get: function get$$1() {
            return _this3.tech_.currentDimensions();
          },
          enumerable: true
        },
        seekable: {
          get: function get$$1() {
            return timeRangesToArray(_this3.tech_.seekable());
          },
          enumerable: true
        },
        timestamp: {
          get: function get$$1() {
            return Date.now();
          },
          enumerable: true
        },
        videoPlaybackQuality: {
          get: function get$$1() {
            return _this3.tech_.getVideoPlaybackQuality();
          },
          enumerable: true
        }
      });

      this.tech_.one('canplay', this.masterPlaylistController_.setupFirstPlay.bind(this.masterPlaylistController_));

      this.tech_.on('bandwidthupdate', function () {
        if (_this3.options_.useBandwidthFromLocalStorage) {
          updateVhsLocalStorage({
            bandwidth: _this3.bandwidth,
            throughput: Math.round(_this3.throughput)
          });
        }
      });

      this.masterPlaylistController_.on('selectedinitialmedia', function () {
        // Add the manual rendition mix-in to HlsHandler
        renditionSelectionMixin(_this3);
        setupEmeOptions(_this3);
      });

      // the bandwidth of the primary segment loader is our best
      // estimate of overall bandwidth
      this.on(this.masterPlaylistController_, 'progress', function () {
        this.tech_.trigger('progress');
      });

      this.tech_.ready(function () {
        return _this3.setupQualityLevels_();
      });

      // do nothing if the tech has been disposed already
      // this can occur if someone sets the src in player.ready(), for instance
      if (!this.tech_.el()) {
        return;
      }

      this.tech_.src(videojs.URL.createObjectURL(this.masterPlaylistController_.mediaSource));
    }

    /**
     * Initializes the quality levels and sets listeners to update them.
     *
     * @method setupQualityLevels_
     * @private
     */

  }, {
    key: 'setupQualityLevels_',
    value: function setupQualityLevels_() {
      var _this4 = this;

      var player = videojs.players[this.tech_.options_.playerId];

      if (player && player.qualityLevels) {
        this.qualityLevels_ = player.qualityLevels();

        this.masterPlaylistController_.on('selectedinitialmedia', function () {
          handleHlsLoadedMetadata(_this4.qualityLevels_, _this4);
        });

        this.playlists.on('mediachange', function () {
          handleHlsMediaChange(_this4.qualityLevels_, _this4.playlists);
        });
      }
    }

    /**
     * Begin playing the video.
     */

  }, {
    key: 'play',
    value: function play() {
      this.masterPlaylistController_.play();
    }

    /**
     * a wrapper around the function in MasterPlaylistController
     */

  }, {
    key: 'setCurrentTime',
    value: function setCurrentTime(currentTime) {
      this.masterPlaylistController_.setCurrentTime(currentTime);
    }

    /**
     * a wrapper around the function in MasterPlaylistController
     */

  }, {
    key: 'duration',
    value: function duration$$1() {
      return this.masterPlaylistController_.duration();
    }

    /**
     * a wrapper around the function in MasterPlaylistController
     */

  }, {
    key: 'seekable',
    value: function seekable$$1() {
      return this.masterPlaylistController_.seekable();
    }

    /**
     * Abort all outstanding work and cleanup.
     */

  }, {
    key: 'dispose',
    value: function dispose() {
      if (this.playbackWatcher_) {
        this.playbackWatcher_.dispose();
      }
      if (this.masterPlaylistController_) {
        this.masterPlaylistController_.dispose();
      }
      if (this.qualityLevels_) {
        this.qualityLevels_.dispose();
      }

      if (this.player_) {
        delete this.player_.vhs;
        delete this.player_.dash;
        delete this.player_.hls;
      }

      if (this.tech_ && this.tech_.hls) {
        delete this.tech_.hls;
      }

      get(HlsHandler.prototype.__proto__ || Object.getPrototypeOf(HlsHandler.prototype), 'dispose', this).call(this);
    }
  }, {
    key: 'convertToProgramTime',
    value: function convertToProgramTime(time, callback) {
      return getProgramTime({
        playlist: this.masterPlaylistController_.media(),
        time: time,
        callback: callback
      });
    }

    // the player must be playing before calling this

  }, {
    key: 'seekToProgramTime',
    value: function seekToProgramTime$$1(programTime, callback) {
      var pauseAfterSeek = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
      var retryCount = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 2;

      return seekToProgramTime({
        programTime: programTime,
        playlist: this.masterPlaylistController_.media(),
        retryCount: retryCount,
        pauseAfterSeek: pauseAfterSeek,
        seekTo: this.options_.seekTo,
        tech: this.options_.tech,
        callback: callback
      });
    }
  }]);
  return HlsHandler;
}(Component);

/**
 * The Source Handler object, which informs video.js what additional
 * MIME types are supported and sets up playback. It is registered
 * automatically to the appropriate tech based on the capabilities of
 * the browser it is running in. It is not necessary to use or modify
 * this object in normal usage.
 */


var HlsSourceHandler = {
  name: 'videojs-http-streaming',
  VERSION: version,
  canHandleSource: function canHandleSource(srcObj) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    var localOptions = videojs.mergeOptions(videojs.options, options);

    return HlsSourceHandler.canPlayType(srcObj.type, localOptions);
  },
  handleSource: function handleSource(source, tech) {
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

    var localOptions = videojs.mergeOptions(videojs.options, options);

    tech.hls = new HlsHandler(source, tech, localOptions);
    tech.hls.xhr = xhrFactory();

    tech.hls.src(source.src, source.type);
    return tech.hls;
  },
  canPlayType: function canPlayType(type) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    var _videojs$mergeOptions = videojs.mergeOptions(videojs.options, options),
        overrideNative = _videojs$mergeOptions.hls.overrideNative;

    var supportedType = simpleTypeFromSourceType(type);
    var canUseMsePlayback = supportedType && (!Hls$1.supportsTypeNatively(supportedType) || overrideNative);

    return canUseMsePlayback ? 'maybe' : '';
  }
};

if (typeof videojs.MediaSource === 'undefined' || typeof videojs.URL === 'undefined') {
  videojs.MediaSource = MediaSource;
  videojs.URL = URL$1;
}

// register source handlers with the appropriate techs
if (MediaSource.supportsNativeMediaSources()) {
  videojs.getTech('Html5').registerSourceHandler(HlsSourceHandler, 0);
}

videojs.HlsHandler = HlsHandler;
videojs.HlsSourceHandler = HlsSourceHandler;
videojs.Hls = Hls$1;
if (!videojs.use) {
  videojs.registerComponent('Hls', Hls$1);
}
videojs.options.hls = videojs.options.hls || {};

if (videojs.registerPlugin) {
  videojs.registerPlugin('reloadSourceOnError', reloadSourceOnError);
} else {
  videojs.plugin('reloadSourceOnError', reloadSourceOnError);
}

exports.LOCAL_STORAGE_KEY = LOCAL_STORAGE_KEY;
exports.Hls = Hls$1;
exports.HlsHandler = HlsHandler;
exports.HlsSourceHandler = HlsSourceHandler;
exports.emeKeySystems = emeKeySystems;
exports.simpleTypeFromSourceType = simpleTypeFromSourceType;
