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452 lines
15 KiB
452 lines
15 KiB
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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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"); } }; }();
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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; }; }();
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var _stream = require('./stream');
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var _stream2 = _interopRequireDefault(_stream);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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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; }
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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; } /**
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* @file m3u8/parse-stream.js
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*/
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/**
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* "forgiving" attribute list psuedo-grammar:
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* attributes -> keyvalue (',' keyvalue)*
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* keyvalue -> key '=' value
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* key -> [^=]*
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* value -> '"' [^"]* '"' | [^,]*
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*/
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var attributeSeparator = function attributeSeparator() {
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var key = '[^=]*';
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var value = '"[^"]*"|[^,]*';
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var keyvalue = '(?:' + key + ')=(?:' + value + ')';
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return new RegExp('(?:^|,)(' + keyvalue + ')');
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};
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/**
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* Parse attributes from a line given the seperator
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*
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* @param {String} attributes the attibute line to parse
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*/
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var parseAttributes = function parseAttributes(attributes) {
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// split the string using attributes as the separator
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var attrs = attributes.split(attributeSeparator());
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var result = {};
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var i = attrs.length;
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var attr = void 0;
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while (i--) {
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// filter out unmatched portions of the string
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if (attrs[i] === '') {
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continue;
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}
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// split the key and value
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attr = /([^=]*)=(.*)/.exec(attrs[i]).slice(1);
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// trim whitespace and remove optional quotes around the value
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attr[0] = attr[0].replace(/^\s+|\s+$/g, '');
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attr[1] = attr[1].replace(/^\s+|\s+$/g, '');
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attr[1] = attr[1].replace(/^['"](.*)['"]$/g, '$1');
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result[attr[0]] = attr[1];
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}
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return result;
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};
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/**
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* A line-level M3U8 parser event stream. It expects to receive input one
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* line at a time and performs a context-free parse of its contents. A stream
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* interpretation of a manifest can be useful if the manifest is expected to
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* be too large to fit comfortably into memory or the entirety of the input
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* is not immediately available. Otherwise, it's probably much easier to work
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* with a regular `Parser` object.
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*
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* Produces `data` events with an object that captures the parser's
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* interpretation of the input. That object has a property `tag` that is one
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* of `uri`, `comment`, or `tag`. URIs only have a single additional
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* property, `line`, which captures the entirety of the input without
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* interpretation. Comments similarly have a single additional property
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* `text` which is the input without the leading `#`.
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*
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* Tags always have a property `tagType` which is the lower-cased version of
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* the M3U8 directive without the `#EXT` or `#EXT-X-` prefix. For instance,
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* `#EXT-X-MEDIA-SEQUENCE` becomes `media-sequence` when parsed. Unrecognized
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* tags are given the tag type `unknown` and a single additional property
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* `data` with the remainder of the input.
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*
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* @class ParseStream
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* @extends Stream
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*/
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var ParseStream = function (_Stream) {
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_inherits(ParseStream, _Stream);
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function ParseStream() {
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_classCallCheck(this, ParseStream);
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return _possibleConstructorReturn(this, (ParseStream.__proto__ || Object.getPrototypeOf(ParseStream)).call(this));
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}
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/**
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* Parses an additional line of input.
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*
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* @param {String} line a single line of an M3U8 file to parse
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*/
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_createClass(ParseStream, [{
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key: 'push',
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value: function push(line) {
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var match = void 0;
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var event = void 0;
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// strip whitespace
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line = line.replace(/^[\u0000\s]+|[\u0000\s]+$/g, '');
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if (line.length === 0) {
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// ignore empty lines
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return;
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}
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// URIs
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if (line[0] !== '#') {
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this.trigger('data', {
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type: 'uri',
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uri: line
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});
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return;
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}
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// Comments
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if (line.indexOf('#EXT') !== 0) {
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this.trigger('data', {
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type: 'comment',
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text: line.slice(1)
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});
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return;
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}
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// strip off any carriage returns here so the regex matching
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// doesn't have to account for them.
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line = line.replace('\r', '');
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// Tags
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match = /^#EXTM3U/.exec(line);
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if (match) {
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this.trigger('data', {
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type: 'tag',
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tagType: 'm3u'
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});
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return;
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}
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match = /^#EXTINF:?([0-9\.]*)?,?(.*)?$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'inf'
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};
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if (match[1]) {
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event.duration = parseFloat(match[1]);
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}
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if (match[2]) {
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event.title = match[2];
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-TARGETDURATION:?([0-9.]*)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'targetduration'
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};
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if (match[1]) {
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event.duration = parseInt(match[1], 10);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#ZEN-TOTAL-DURATION:?([0-9.]*)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'totalduration'
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};
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if (match[1]) {
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event.duration = parseInt(match[1], 10);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-VERSION:?([0-9.]*)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'version'
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};
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if (match[1]) {
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event.version = parseInt(match[1], 10);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-MEDIA-SEQUENCE:?(\-?[0-9.]*)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'media-sequence'
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};
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if (match[1]) {
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event.number = parseInt(match[1], 10);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-DISCONTINUITY-SEQUENCE:?(\-?[0-9.]*)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'discontinuity-sequence'
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};
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if (match[1]) {
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event.number = parseInt(match[1], 10);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-PLAYLIST-TYPE:?(.*)?$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'playlist-type'
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};
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if (match[1]) {
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event.playlistType = match[1];
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-BYTERANGE:?([0-9.]*)?@?([0-9.]*)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'byterange'
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};
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if (match[1]) {
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event.length = parseInt(match[1], 10);
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}
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if (match[2]) {
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event.offset = parseInt(match[2], 10);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-ALLOW-CACHE:?(YES|NO)?/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'allow-cache'
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};
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if (match[1]) {
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event.allowed = !/NO/.test(match[1]);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-MAP:?(.*)$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'map'
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};
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if (match[1]) {
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var attributes = parseAttributes(match[1]);
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if (attributes.URI) {
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event.uri = attributes.URI;
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}
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if (attributes.BYTERANGE) {
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var _attributes$BYTERANGE = attributes.BYTERANGE.split('@'),
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_attributes$BYTERANGE2 = _slicedToArray(_attributes$BYTERANGE, 2),
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length = _attributes$BYTERANGE2[0],
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offset = _attributes$BYTERANGE2[1];
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event.byterange = {};
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if (length) {
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event.byterange.length = parseInt(length, 10);
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}
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if (offset) {
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event.byterange.offset = parseInt(offset, 10);
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}
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}
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-STREAM-INF:?(.*)$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'stream-inf'
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};
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if (match[1]) {
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event.attributes = parseAttributes(match[1]);
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if (event.attributes.RESOLUTION) {
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var split = event.attributes.RESOLUTION.split('x');
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var resolution = {};
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if (split[0]) {
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resolution.width = parseInt(split[0], 10);
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}
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if (split[1]) {
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resolution.height = parseInt(split[1], 10);
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}
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event.attributes.RESOLUTION = resolution;
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}
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if (event.attributes.BANDWIDTH) {
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event.attributes.BANDWIDTH = parseInt(event.attributes.BANDWIDTH, 10);
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}
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if (event.attributes['PROGRAM-ID']) {
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event.attributes['PROGRAM-ID'] = parseInt(event.attributes['PROGRAM-ID'], 10);
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}
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-MEDIA:?(.*)$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'media'
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};
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if (match[1]) {
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event.attributes = parseAttributes(match[1]);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-ENDLIST/.exec(line);
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if (match) {
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this.trigger('data', {
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type: 'tag',
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tagType: 'endlist'
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});
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return;
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}
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match = /^#EXT-X-DISCONTINUITY/.exec(line);
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if (match) {
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this.trigger('data', {
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type: 'tag',
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tagType: 'discontinuity'
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});
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return;
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}
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match = /^#EXT-X-PROGRAM-DATE-TIME:?(.*)$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'program-date-time'
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};
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if (match[1]) {
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event.dateTimeString = match[1];
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event.dateTimeObject = new Date(match[1]);
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-KEY:?(.*)$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'key'
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};
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if (match[1]) {
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event.attributes = parseAttributes(match[1]);
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// parse the IV string into a Uint32Array
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if (event.attributes.IV) {
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if (event.attributes.IV.substring(0, 2).toLowerCase() === '0x') {
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event.attributes.IV = event.attributes.IV.substring(2);
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}
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event.attributes.IV = event.attributes.IV.match(/.{8}/g);
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event.attributes.IV[0] = parseInt(event.attributes.IV[0], 16);
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event.attributes.IV[1] = parseInt(event.attributes.IV[1], 16);
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event.attributes.IV[2] = parseInt(event.attributes.IV[2], 16);
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event.attributes.IV[3] = parseInt(event.attributes.IV[3], 16);
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event.attributes.IV = new Uint32Array(event.attributes.IV);
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}
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-CUE-OUT-CONT:?(.*)?$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'cue-out-cont'
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};
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if (match[1]) {
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event.data = match[1];
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} else {
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event.data = '';
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-CUE-OUT:?(.*)?$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'cue-out'
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};
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if (match[1]) {
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event.data = match[1];
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} else {
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event.data = '';
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}
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this.trigger('data', event);
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return;
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}
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match = /^#EXT-X-CUE-IN:?(.*)?$/.exec(line);
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if (match) {
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event = {
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type: 'tag',
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tagType: 'cue-in'
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};
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if (match[1]) {
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event.data = match[1];
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} else {
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event.data = '';
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}
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this.trigger('data', event);
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return;
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}
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// unknown tag type
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this.trigger('data', {
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type: 'tag',
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data: line.slice(4)
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});
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}
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}]);
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return ParseStream;
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}(_stream2['default']);
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exports['default'] = ParseStream; |