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116 lines
3.3 KiB
116 lines
3.3 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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exports.parseTs = void 0;
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var _byteHelpers = require("./byte-helpers.js");
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var SYNC_BYTE = 0x47;
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var parseTs = function parseTs(bytes, maxPes) {
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if (maxPes === void 0) {
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maxPes = Infinity;
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}
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bytes = (0, _byteHelpers.toUint8)(bytes);
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var startIndex = 0;
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var endIndex = 188;
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var pmt = {};
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var pesCount = 0;
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while (endIndex < bytes.byteLength && pesCount < maxPes) {
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if (bytes[startIndex] !== SYNC_BYTE && bytes[endIndex] !== SYNC_BYTE) {
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endIndex += 1;
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startIndex += 1;
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continue;
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}
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var packet = bytes.subarray(startIndex, endIndex);
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var pid = (packet[1] & 0x1f) << 8 | packet[2];
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var hasPusi = !!(packet[1] & 0x40);
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var hasAdaptationHeader = (packet[3] & 0x30) >>> 4 > 0x01;
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var payloadOffset = 4 + (hasAdaptationHeader ? packet[4] + 1 : 0);
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if (hasPusi) {
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payloadOffset += packet[payloadOffset] + 1;
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}
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if (pid === 0 && !pmt.pid) {
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pmt.pid = (packet[payloadOffset + 10] & 0x1f) << 8 | packet[payloadOffset + 11];
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} else if (pmt.pid && pid === pmt.pid && !pmt.streams) {
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var isNotForward = packet[payloadOffset + 5] & 0x01; // ignore forward pmt delarations
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if (!isNotForward) {
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continue;
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}
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pmt.streams = {};
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var sectionLength = (packet[payloadOffset + 1] & 0x0f) << 8 | packet[payloadOffset + 2];
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var tableEnd = 3 + sectionLength - 4;
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var programInfoLength = (packet[payloadOffset + 10] & 0x0f) << 8 | packet[payloadOffset + 11];
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var offset = 12 + programInfoLength;
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while (offset < tableEnd) {
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// add an entry that maps the elementary_pid to the stream_type
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var i = payloadOffset + offset;
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var type = packet[i];
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var esPid = (packet[i + 1] & 0x1F) << 8 | packet[i + 2];
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var esLength = (packet[i + 3] & 0x0f) << 8 | packet[i + 4];
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var esInfo = packet.subarray(i + 5, i + 5 + esLength);
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var stream = pmt.streams[esPid] = {
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esInfo: esInfo,
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typeNumber: type,
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packets: [],
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type: '',
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codec: ''
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};
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if (type === 0x06 && (0, _byteHelpers.bytesMatch)(esInfo, [0x4F, 0x70, 0x75, 0x73], {
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offset: 2
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})) {
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stream.type = 'audio';
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stream.codec = 'opus';
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} else if (type === 0x1B || type === 0x20) {
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stream.type = 'video';
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stream.codec = 'avc1';
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} else if (type === 0x24) {
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stream.type = 'video';
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stream.codec = 'hev1';
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} else if (type === 0x10) {
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stream.type = 'video';
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stream.codec = 'mp4v.20';
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} else if (type === 0x0F) {
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stream.type = 'audio';
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stream.codec = 'aac';
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} else if (type === 0x81) {
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stream.type = 'audio';
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stream.codec = 'ac-3';
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} else if (type === 0x87) {
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stream.type = 'audio';
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stream.codec = 'ec-3';
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} else if (type === 0x03 || type === 0x04) {
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stream.type = 'audio';
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stream.codec = 'mp3';
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}
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offset += esLength + 5;
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}
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} else if (pmt.pid && pmt.streams) {
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pmt.streams[pid].packets.push(packet.subarray(payloadOffset));
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pesCount++;
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}
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startIndex += 188;
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endIndex += 188;
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}
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if (!pmt.streams) {
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pmt.streams = {};
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}
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return pmt;
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};
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exports.parseTs = parseTs; |