Source: lib/media/media_source_engine.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.media.MediaSourceEngine');
  9. goog.require('goog.asserts');
  10. goog.require('shaka.log');
  11. goog.require('shaka.config.CodecSwitchingStrategy');
  12. goog.require('shaka.media.Capabilities');
  13. goog.require('shaka.media.ContentWorkarounds');
  14. goog.require('shaka.media.ClosedCaptionParser');
  15. goog.require('shaka.media.IClosedCaptionParser');
  16. goog.require('shaka.media.ManifestParser');
  17. goog.require('shaka.media.SegmentReference');
  18. goog.require('shaka.media.TimeRangesUtils');
  19. goog.require('shaka.text.TextEngine');
  20. goog.require('shaka.transmuxer.TransmuxerEngine');
  21. goog.require('shaka.util.BufferUtils');
  22. goog.require('shaka.util.Destroyer');
  23. goog.require('shaka.util.Dom');
  24. goog.require('shaka.util.Error');
  25. goog.require('shaka.util.EventManager');
  26. goog.require('shaka.util.FakeEvent');
  27. goog.require('shaka.util.Functional');
  28. goog.require('shaka.util.IDestroyable');
  29. goog.require('shaka.util.Id3Utils');
  30. goog.require('shaka.util.ManifestParserUtils');
  31. goog.require('shaka.util.MimeUtils');
  32. goog.require('shaka.util.Mp4BoxParsers');
  33. goog.require('shaka.util.Mp4Parser');
  34. goog.require('shaka.util.Platform');
  35. goog.require('shaka.util.PublicPromise');
  36. goog.require('shaka.util.StreamUtils');
  37. goog.require('shaka.util.TsParser');
  38. goog.require('shaka.lcevc.Dec');
  41. /**
  42.  * @summary
  43.  * MediaSourceEngine wraps all operations on MediaSource and SourceBuffers.
  44.  * All asynchronous operations return a Promise, and all operations are
  45.  * internally synchronized and serialized as needed.  Operations that can
  46.  * be done in parallel will be done in parallel.
  47.  *
  48.  * @implements {shaka.util.IDestroyable}
  49.  */
  50. shaka.media.MediaSourceEngine = class {
  51.   /**
  52.    * @param {HTMLMediaElement} video The video element, whose source is tied to
  53.    *   MediaSource during the lifetime of the MediaSourceEngine.
  54.    * @param {!shaka.extern.TextDisplayer} textDisplayer
  55.    *    The text displayer that will be used with the text engine.
  56.    *    MediaSourceEngine takes ownership of the displayer. When
  57.    *    MediaSourceEngine is destroyed, it will destroy the displayer.
  58.    * @param {!shaka.media.MediaSourceEngine.PlayerInterface} playerInterface
  59.    *   Interface for common player methods.
  60.    * @param {?shaka.lcevc.Dec} [lcevcDec] Optional -  LCEVC Decoder Object
  61.    */
  62.   constructor(video, textDisplayer, playerInterface, lcevcDec) {
  63.     /** @private {HTMLMediaElement} */
  64.     this.video_ = video;
  66.     /** @private {?shaka.media.MediaSourceEngine.PlayerInterface} */
  67.     this.playerInterface_ = playerInterface;
  69.     /** @private {?shaka.extern.MediaSourceConfiguration} */
  70.     this.config_ = null;
  72.     /** @private {shaka.extern.TextDisplayer} */
  73.     this.textDisplayer_ = textDisplayer;
  75.     /**
  76.      * @private {!Object<shaka.util.ManifestParserUtils.ContentType,
  77.      *                    SourceBuffer>}
  78.      */
  79.     this.sourceBuffers_ = {};
  81.     /**
  82.      * @private {!Object<shaka.util.ManifestParserUtils.ContentType,
  83.      *                    string>}
  84.      */
  85.     this.sourceBufferTypes_ = {};
  88.     /**
  89.      * @private {!Object<shaka.util.ManifestParserUtils.ContentType,
  90.      *                    boolean>}
  91.      */
  92.     this.expectedEncryption_ = {};
  94.     /** @private {shaka.text.TextEngine} */
  95.     this.textEngine_ = null;
  97.     /** @private {boolean} */
  98.     this.segmentRelativeVttTiming_ = false;
  100.     /** @private {?shaka.lcevc.Dec} */
  101.     this.lcevcDec_ = lcevcDec || null;
  103.     /**
  104.      * @private {!Object<string,
  105.      *                    !Array<shaka.media.MediaSourceEngine.Operation>>}
  106.      */
  107.     this.queues_ = {};
  109.     /** @private {shaka.util.EventManager} */
  110.     this.eventManager_ = new shaka.util.EventManager();
  112.     /** @private {!Object<string, !shaka.extern.Transmuxer>} */
  113.     this.transmuxers_ = {};
  115.     /** @private {?shaka.media.IClosedCaptionParser} */
  116.     this.captionParser_ = null;
  118.     /** @private {!shaka.util.PublicPromise} */
  119.     this.mediaSourceOpen_ = new shaka.util.PublicPromise();
  121.     /** @private {string} */
  122.     this.url_ = '';
  124.     /** @private {boolean} */
  125.     this.playbackHasBegun_ = false;
  127.     /** @private {boolean} */
  128.     this.streamingAllowed_ = true;
  130.     /** @private {boolean} */
  131.     this.usingRemotePlayback_ = false;
  133.     /** @private {HTMLSourceElement} */
  134.     this.source_ = null;
  136.     /**
  137.      * Fallback source element with direct media URI, used for casting
  138.      * purposes.
  139.      * @private {HTMLSourceElement}
  140.      */
  141.     this.secondarySource_ = null;
  143.     /** @private {MediaSource} */
  144.     this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
  146.     /** @private {boolean} */
  147.     this.reloadingMediaSource_ = false;
  149.     /** @type {!shaka.util.Destroyer} */
  150.     this.destroyer_ = new shaka.util.Destroyer(() => this.doDestroy_());
  152.     /** @private {boolean} */
  153.     this.sequenceMode_ = false;
  155.     /** @private {string} */
  156.     this.manifestType_ = shaka.media.ManifestParser.UNKNOWN;
  158.     /** @private {boolean} */
  159.     this.ignoreManifestTimestampsInSegmentsMode_ = false;
  161.     /** @private {boolean} */
  162.     this.attemptTimestampOffsetCalculation_ = false;
  164.     /** @private {!shaka.util.PublicPromise<number>} */
  165.     this.textSequenceModeOffset_ = new shaka.util.PublicPromise();
  167.     /** @private {boolean} */
  168.     this.needSplitMuxedContent_ = false;
  170.     /** @private {?number} */
  171.     this.lastDuration_ = null;
  173.     /**
  174.      * @private {!Object<shaka.util.ManifestParserUtils.ContentType,
  175.      *                    !shaka.util.TsParser>}
  176.      */
  177.     this.tsParsers_ = {};
  179.     /** @private {?number} */
  180.     this.firstVideoTimestamp_ = null;
  182.     /** @private {?number} */
  183.     this.firstVideoReferenceStartTime_ = null;
  185.     /** @private {?number} */
  186.     this.firstAudioTimestamp_ = null;
  188.     /** @private {?number} */
  189.     this.firstAudioReferenceStartTime_ = null;
  191.     /** @private {!shaka.util.PublicPromise<number>} */
  192.     this.audioCompensation_ = new shaka.util.PublicPromise();
  194.     if (this.video_.remote) {
  195.       this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
  197.       this.eventManager_.listen(this.video_.remote, 'connect', () => {
  198.         this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
  199.       });
  201.       this.eventManager_.listen(this.video_.remote, 'connecting', () => {
  202.         this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
  203.       });
  205.       this.eventManager_.listen(this.video_.remote, 'disconnect', () => {
  206.         this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
  207.       });
  208.     }
  209.   }
  211.   /**
  212.    * Create a MediaSource object, attach it to the video element, and return it.
  213.    * Resolves the given promise when the MediaSource is ready.
  214.    *
  215.    * Replaced by unit tests.
  216.    *
  217.    * @param {!shaka.util.PublicPromise} p
  218.    * @return {!MediaSource}
  219.    */
  220.   createMediaSource(p) {
  221.     this.streamingAllowed_ = true;
  223.     /** @type {!MediaSource} */
  224.     let mediaSource;
  226.     if (window.ManagedMediaSource) {
  227.       if (!this.secondarySource_) {
  228.         this.video_.disableRemotePlayback = true;
  229.       }
  231.       mediaSource = new ManagedMediaSource();
  233.       this.eventManager_.listen(
  234.           mediaSource, 'startstreaming', () => {
  235.             shaka.log.info('MMS startstreaming');
  236.             this.streamingAllowed_ = true;
  237.           });
  239.       this.eventManager_.listen(
  240.           mediaSource, 'endstreaming', () => {
  241.             shaka.log.info('MMS endstreaming');
  242.             this.streamingAllowed_ = false;
  243.           });
  244.     } else {
  245.       mediaSource = new MediaSource();
  246.     }
  248.     // Set up MediaSource on the video element.
  249.     this.eventManager_.listenOnce(
  250.         mediaSource, 'sourceopen', () => this.onSourceOpen_(p));
  252.     // Correctly set when playback has begun.
  253.     this.eventManager_.listenOnce(this.video_, 'playing', () => {
  254.       this.playbackHasBegun_ = true;
  255.     });
  257.     // Store the object URL for releasing it later.
  258.     this.url_ = shaka.media.MediaSourceEngine.createObjectURL(mediaSource);
  260.     this.video_.removeAttribute('src');
  261.     if (this.source_) {
  262.       this.video_.removeChild(this.source_);
  263.     }
  264.     if (this.secondarySource_) {
  265.       this.video_.removeChild(this.secondarySource_);
  266.     }
  267.     this.source_ = shaka.util.Dom.createSourceElement(this.url_);
  268.     this.video_.appendChild(this.source_);
  269.     if (this.secondarySource_) {
  270.       this.video_.appendChild(this.secondarySource_);
  271.     }
  272.     this.video_.load();
  274.     return mediaSource;
  275.   }
  277.   /**
  278.    * @param {string} uri
  279.    * @param {string} mimeType
  280.    */
  281.   addSecondarySource(uri, mimeType) {
  282.     if (!this.video_ || !window.ManagedMediaSource || !this.mediaSource_) {
  283.       shaka.log.warning(
  284.           'Secondary source is used only with ManagedMediaSource');
  285.       return;
  286.     }
  287.     if (this.secondarySource_) {
  288.       this.video_.removeChild(this.secondarySource_);
  289.     }
  290.     this.secondarySource_ = shaka.util.Dom.createSourceElement(uri, mimeType);
  291.     this.video_.appendChild(this.secondarySource_);
  292.     this.video_.disableRemotePlayback = false;
  293.   }
  295.   /**
  296.    * @param {shaka.util.PublicPromise} p
  297.    * @private
  298.    */
  299.   onSourceOpen_(p) {
  300.     goog.asserts.assert(this.url_, 'Must have object URL');
  302.     // Release the object URL that was previously created, to prevent memory
  303.     // leak.
  304.     // createObjectURL creates a strong reference to the MediaSource object
  305.     // inside the browser.  Setting the src of the video then creates another
  306.     // reference within the video element.  revokeObjectURL will remove the
  307.     // strong reference to the MediaSource object, and allow it to be
  308.     // garbage-collected later.
  309.     URL.revokeObjectURL(this.url_);
  310.     p.resolve();
  311.   }
  313.   /**
  314.    * Checks if a certain type is supported.
  315.    *
  316.    * @param {shaka.extern.Stream} stream
  317.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  318.    * @return {!Promise<boolean>}
  319.    */
  320.   static async isStreamSupported(stream, contentType) {
  321.     if (stream.createSegmentIndex) {
  322.       await stream.createSegmentIndex();
  323.     }
  324.     if (!stream.segmentIndex) {
  325.       return false;
  326.     }
  327.     if (stream.segmentIndex.isEmpty()) {
  328.       return true;
  329.     }
  330.     const MimeUtils = shaka.util.MimeUtils;
  331.     const TransmuxerEngine = shaka.transmuxer.TransmuxerEngine;
  332.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  333.     const StreamUtils = shaka.util.StreamUtils;
  334.     const seenCombos = new Set();
  335.     // Check each combination of mimeType and codecs within the segment index.
  336.     // Unfortunately we cannot use fullMimeTypes, as we ALSO need to check the
  337.     // getFullTypeWithAllCodecs (for the sake of the transmuxer) and we have no
  338.     // way of going from a full mimeType to a full mimeType with all codecs.
  339.     // As this function is only called in debug mode, a little inefficiency is
  340.     // acceptable.
  341.     for (const ref of stream.segmentIndex) {
  342.       const mimeType = ref.mimeType || stream.mimeType || '';
  343.       let codecs = ref.codecs || stream.codecs || '';
  344.       // Optimization for the case where the codecs and mimetype of the stream
  345.       // match the reference.
  346.       if (mimeType == stream.mimeType && codecs == stream.codecs) {
  347.         continue;
  348.       }
  349.       // Don't check the same combination of mimetype + codecs twice.
  350.       const combo = mimeType + ':' + codecs;
  351.       if (seenCombos.has(combo)) {
  352.         continue;
  353.       }
  354.       seenCombos.add(combo);
  355.       if (contentType == ContentType.TEXT) {
  356.         const fullMimeType = MimeUtils.getFullType(mimeType, codecs);
  357.         if (!shaka.text.TextEngine.isTypeSupported(fullMimeType)) {
  358.           return false;
  359.         }
  360.       } else {
  361.         if (contentType == ContentType.VIDEO) {
  362.           codecs = StreamUtils.getCorrectVideoCodecs(codecs);
  363.         } else if (contentType == ContentType.AUDIO) {
  364.           codecs = StreamUtils.getCorrectAudioCodecs(codecs, mimeType);
  365.         }
  366.         const extendedMimeType = MimeUtils.getExtendedType(
  367.             stream, mimeType, codecs);
  368.         const fullMimeType = MimeUtils.getFullTypeWithAllCodecs(
  369.             mimeType, codecs);
  370.         if (!shaka.media.Capabilities.isTypeSupported(extendedMimeType) &&
  371.             !TransmuxerEngine.isSupported(fullMimeType, stream.type)) {
  372.           return false;
  373.         }
  374.       }
  375.     }
  376.     return true;
  377.   }
  379.   /**
  380.    * Returns a map of MediaSource support for well-known types.
  381.    *
  382.    * @return {!Object<string, boolean>}
  383.    */
  384.   static probeSupport() {
  385.     const testMimeTypes = [
  386.       // MP4 types
  387.       'video/mp4; codecs="avc1.42E01E"',
  388.       'video/mp4; codecs="avc3.42E01E"',
  389.       'video/mp4; codecs="hev1.1.6.L93.90"',
  390.       'video/mp4; codecs="hvc1.1.6.L93.90"',
  391.       'video/mp4; codecs="hev1.2.4.L153.B0"; eotf="smpte2084"',  // HDR HEVC
  392.       'video/mp4; codecs="hvc1.2.4.L153.B0"; eotf="smpte2084"',  // HDR HEVC
  393.       'video/mp4; codecs="vp9"',
  394.       'video/mp4; codecs="vp09.00.10.08"',
  395.       'video/mp4; codecs="av01.0.01M.08"',
  396.       'video/mp4; codecs="dvh1.05.01"',
  397.       'video/mp4; codecs="dvh1.20.01"',
  398.       'audio/mp4; codecs="mp4a.40.2"',
  399.       'audio/mp4; codecs="ac-3"',
  400.       'audio/mp4; codecs="ec-3"',
  401.       'audio/mp4; codecs="ac-4.02.01.01"',
  402.       'audio/mp4; codecs="opus"',
  403.       'audio/mp4; codecs="flac"',
  404.       'audio/mp4; codecs="dtsc"', // DTS Digital Surround
  405.       'audio/mp4; codecs="dtse"', // DTS Express
  406.       'audio/mp4; codecs="dtsx"', // DTS:X
  407.       // WebM types
  408.       'video/webm; codecs="vp8"',
  409.       'video/webm; codecs="vp9"',
  410.       'video/webm; codecs="vp09.00.10.08"',
  411.       'audio/webm; codecs="vorbis"',
  412.       'audio/webm; codecs="opus"',
  413.       // MPEG2 TS types (video/ is also used for audio: https://bit.ly/TsMse)
  414.       'video/mp2t; codecs="avc1.42E01E"',
  415.       'video/mp2t; codecs="avc3.42E01E"',
  416.       'video/mp2t; codecs="hvc1.1.6.L93.90"',
  417.       'video/mp2t; codecs="mp4a.40.2"',
  418.       'video/mp2t; codecs="ac-3"',
  419.       'video/mp2t; codecs="ec-3"',
  420.       // WebVTT types
  421.       'text/vtt',
  422.       'application/mp4; codecs="wvtt"',
  423.       // TTML types
  424.       'application/ttml+xml',
  425.       'application/mp4; codecs="stpp"',
  426.       // Containerless types
  427.       ...shaka.util.MimeUtils.RAW_FORMATS,
  428.     ];
  430.     const support = {};
  431.     for (const type of testMimeTypes) {
  432.       if (shaka.text.TextEngine.isTypeSupported(type)) {
  433.         support[type] = true;
  434.       } else if (shaka.util.Platform.supportsMediaSource()) {
  435.         support[type] = shaka.media.Capabilities.isTypeSupported(type) ||
  436.                         shaka.transmuxer.TransmuxerEngine.isSupported(type);
  437.       } else {
  438.         support[type] = shaka.util.Platform.supportsMediaType(type);
  439.       }
  441.       const basicType = type.split(';')[0];
  442.       support[basicType] = support[basicType] || support[type];
  443.     }
  445.     return support;
  446.   }
  448.   /** @override */
  449.   destroy() {
  450.     return this.destroyer_.destroy();
  451.   }
  453.   /** @private */
  454.   async doDestroy_() {
  455.     const Functional = shaka.util.Functional;
  457.     const cleanup = [];
  459.     for (const contentType in this.queues_) {
  460.       // Make a local copy of the queue and the first item.
  461.       const q = this.queues_[contentType];
  462.       const inProgress = q[0];
  464.       // Drop everything else out of the original queue.
  465.       this.queues_[contentType] = q.slice(0, 1);
  467.       // We will wait for this item to complete/fail.
  468.       if (inProgress) {
  469.         cleanup.push(inProgress.p.catch(Functional.noop));
  470.       }
  472.       // The rest will be rejected silently if possible.
  473.       for (const item of q.slice(1)) {
  474.         item.p.reject(shaka.util.Destroyer.destroyedError());
  475.       }
  476.     }
  478.     if (this.textEngine_) {
  479.       cleanup.push(this.textEngine_.destroy());
  480.     }
  482.     await Promise.all(cleanup);
  484.     for (const contentType in this.transmuxers_) {
  485.       this.transmuxers_[contentType].destroy();
  486.     }
  488.     if (this.eventManager_) {
  489.       this.eventManager_.release();
  490.       this.eventManager_ = null;
  491.     }
  493.     if (this.video_ && this.secondarySource_) {
  494.       this.video_.removeChild(this.secondarySource_);
  495.     }
  496.     if (this.video_ && this.source_) {
  497.       // "unload" the video element.
  498.       this.video_.removeChild(this.source_);
  499.       this.video_.load();
  500.       this.video_.disableRemotePlayback = false;
  501.     }
  503.     this.video_ = null;
  504.     this.source_ = null;
  505.     this.secondarySource_ = null;
  506.     this.config_ = null;
  507.     this.mediaSource_ = null;
  508.     this.textEngine_ = null;
  509.     this.textDisplayer_ = null;
  510.     this.sourceBuffers_ = {};
  511.     this.transmuxers_ = {};
  512.     this.captionParser_ = null;
  513.     if (goog.DEBUG) {
  514.       for (const contentType in this.queues_) {
  515.         goog.asserts.assert(
  516.             this.queues_[contentType].length == 0,
  517.             contentType + ' queue should be empty after destroy!');
  518.       }
  519.     }
  520.     this.queues_ = {};
  522.     // This object is owned by Player
  523.     this.lcevcDec_ = null;
  525.     this.tsParsers_ = {};
  526.     this.playerInterface_ = null;
  527.   }
  529.   /**
  530.    * @return {!Promise} Resolved when MediaSource is open and attached to the
  531.    *   media element.  This process is actually initiated by the constructor.
  532.    */
  533.   open() {
  534.     return this.mediaSourceOpen_;
  535.   }
  537.   /**
  538.    * Initialize MediaSourceEngine.
  539.    *
  540.    * Note that it is not valid to call this multiple times, except to add or
  541.    * reinitialize text streams.
  542.    *
  543.    * @param {!Map<shaka.util.ManifestParserUtils.ContentType,
  544.    *               shaka.extern.Stream>} streamsByType
  545.    *   A map of content types to streams.  All streams must be supported
  546.    *   according to MediaSourceEngine.isStreamSupported.
  547.    * @param {boolean=} sequenceMode
  548.    *   If true, the media segments are appended to the SourceBuffer in strict
  549.    *   sequence.
  550.    * @param {string=} manifestType
  551.    *   Indicates the type of the manifest.
  552.    * @param {boolean=} ignoreManifestTimestampsInSegmentsMode
  553.    *   If true, don't adjust the timestamp offset to account for manifest
  554.    *   segment durations being out of sync with segment durations. In other
  555.    *   words, assume that there are no gaps in the segments when appending
  556.    *   to the SourceBuffer, even if the manifest and segment times disagree.
  557.    *   Indicates if the manifest has text streams.
  558.    *
  559.    * @return {!Promise}
  560.    */
  561.   async init(streamsByType, sequenceMode=false,
  562.       manifestType=shaka.media.ManifestParser.UNKNOWN,
  563.       ignoreManifestTimestampsInSegmentsMode=false) {
  564.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  566.     await this.mediaSourceOpen_;
  567.     if (this.ended() || this.closed()) {
  568.       shaka.log.alwaysError('Expected MediaSource to be open during init(); ' +
  569.           'reopening the media source.');
  570.       this.mediaSourceOpen_ = new shaka.util.PublicPromise();
  571.       this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
  572.       await this.mediaSourceOpen_;
  573.     }
  575.     this.sequenceMode_ = sequenceMode;
  576.     this.manifestType_ = manifestType;
  577.     this.ignoreManifestTimestampsInSegmentsMode_ =
  578.       ignoreManifestTimestampsInSegmentsMode;
  580.     this.attemptTimestampOffsetCalculation_ = !this.sequenceMode_ &&
  581.         this.manifestType_ == shaka.media.ManifestParser.HLS &&
  582.         !this.ignoreManifestTimestampsInSegmentsMode_;
  584.     this.tsParsers_ = {};
  585.     this.firstVideoTimestamp_ = null;
  586.     this.firstVideoReferenceStartTime_ = null;
  587.     this.firstAudioTimestamp_ = null;
  588.     this.firstAudioReferenceStartTime_ = null;
  589.     this.audioCompensation_ = new shaka.util.PublicPromise();
  591.     for (const contentType of streamsByType.keys()) {
  592.       const stream = streamsByType.get(contentType);
  593.       // eslint-disable-next-line no-await-in-loop
  594.       await this.initSourceBuffer_(contentType, stream, stream.codecs);
  595.       if (this.needSplitMuxedContent_) {
  596.         this.queues_[ContentType.AUDIO] = [];
  597.         this.queues_[ContentType.VIDEO] = [];
  598.       } else {
  599.         this.queues_[contentType] = [];
  600.       }
  601.     }
  602.     const audio = streamsByType.get(ContentType.AUDIO);
  603.     if (audio && audio.isAudioMuxedInVideo) {
  604.       this.needSplitMuxedContent_ = true;
  605.     }
  606.   }
  608.   /**
  609.    * Initialize a specific SourceBuffer.
  610.    *
  611.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  612.    * @param {shaka.extern.Stream} stream
  613.    * @param {string} codecs
  614.    * @return {!Promise}
  615.    * @private
  616.    */
  617.   async initSourceBuffer_(contentType, stream, codecs) {
  618.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  620.     goog.asserts.assert(
  621.         await shaka.media.MediaSourceEngine.isStreamSupported(
  622.             stream, contentType),
  623.         'Type negotiation should happen before MediaSourceEngine.init!');
  625.     if (contentType == ContentType.AUDIO && codecs) {
  626.       codecs = shaka.util.StreamUtils.getCorrectAudioCodecs(
  627.           codecs, stream.mimeType);
  628.     }
  630.     let mimeType = shaka.util.MimeUtils.getFullType(
  631.         stream.mimeType, codecs);
  632.     if (contentType == ContentType.TEXT) {
  633.       this.reinitText(mimeType, this.sequenceMode_, stream.external);
  634.     } else {
  635.       let needTransmux = this.config_.forceTransmux;
  636.       if (!shaka.media.Capabilities.isTypeSupported(mimeType) ||
  637.           (!this.sequenceMode_ &&
  638.           shaka.util.MimeUtils.RAW_FORMATS.includes(mimeType))) {
  639.         needTransmux = true;
  640.       }
  641.       const mimeTypeWithAllCodecs =
  642.           shaka.util.MimeUtils.getFullTypeWithAllCodecs(
  643.               stream.mimeType, codecs);
  644.       if (needTransmux) {
  645.         const audioCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
  646.             ContentType.AUDIO, (codecs || '').split(','));
  647.         const videoCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
  648.             ContentType.VIDEO, (codecs || '').split(','));
  649.         if (audioCodec && videoCodec) {
  650.           this.needSplitMuxedContent_ = true;
  651.           await this.initSourceBuffer_(ContentType.AUDIO, stream, audioCodec);
  652.           await this.initSourceBuffer_(ContentType.VIDEO, stream, videoCodec);
  653.           return;
  654.         }
  655.         const transmuxerPlugin = shaka.transmuxer.TransmuxerEngine
  656.             .findTransmuxer(mimeTypeWithAllCodecs);
  657.         if (transmuxerPlugin) {
  658.           const transmuxer = transmuxerPlugin();
  659.           this.transmuxers_[contentType] = transmuxer;
  660.           mimeType =
  661.               transmuxer.convertCodecs(contentType, mimeTypeWithAllCodecs);
  662.         }
  663.       }
  664.       const type = this.addExtraFeaturesToMimeType_(mimeType);
  666.       this.destroyer_.ensureNotDestroyed();
  668.       let sourceBuffer;
  670.       try {
  671.         sourceBuffer = this.mediaSource_.addSourceBuffer(type);
  672.       } catch (exception) {
  673.         throw new shaka.util.Error(
  674.             shaka.util.Error.Severity.CRITICAL,
  675.             shaka.util.Error.Category.MEDIA,
  676.             shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_THREW,
  677.             exception,
  678.             'The mediaSource_ status was ' + this.mediaSource_.readyState +
  679.             ' expected \'open\'',
  680.             null);
  681.       }
  683.       if (this.sequenceMode_) {
  684.         sourceBuffer.mode =
  685.             shaka.media.MediaSourceEngine.SourceBufferMode_.SEQUENCE;
  686.       }
  688.       this.eventManager_.listen(
  689.           sourceBuffer, 'error',
  690.           () => this.onError_(contentType));
  691.       this.eventManager_.listen(
  692.           sourceBuffer, 'updateend',
  693.           () => this.onUpdateEnd_(contentType));
  694.       this.sourceBuffers_[contentType] = sourceBuffer;
  695.       this.sourceBufferTypes_[contentType] = mimeType;
  696.       this.expectedEncryption_[contentType] = !!stream.drmInfos.length;
  697.     }
  698.   }
  700.   /**
  701.    * Called by the Player to provide an updated configuration any time it
  702.    * changes. Must be called at least once before init().
  703.    *
  704.    * @param {shaka.extern.MediaSourceConfiguration} config
  705.    */
  706.   configure(config) {
  707.     this.config_ = config;
  708.     if (this.textEngine_) {
  709.       this.textEngine_.setModifyCueCallback(config.modifyCueCallback);
  710.     }
  711.   }
  713.   /**
  714.    * Indicate if the streaming is allowed by MediaSourceEngine.
  715.    * If we using MediaSource we always returns true.
  716.    *
  717.    * @return {boolean}
  718.    */
  719.   isStreamingAllowed() {
  720.     return this.streamingAllowed_ && !this.usingRemotePlayback_ &&
  721.         !this.reloadingMediaSource_;
  722.   }
  724.   /**
  725.    * Reinitialize the TextEngine for a new text type.
  726.    * @param {string} mimeType
  727.    * @param {boolean} sequenceMode
  728.    * @param {boolean} external
  729.    */
  730.   reinitText(mimeType, sequenceMode, external) {
  731.     if (!this.textEngine_) {
  732.       this.textEngine_ = new shaka.text.TextEngine(this.textDisplayer_);
  733.       if (this.textEngine_) {
  734.         this.textEngine_.setModifyCueCallback(this.config_.modifyCueCallback);
  735.       }
  736.     }
  737.     this.textEngine_.initParser(mimeType, sequenceMode,
  738.         external || this.segmentRelativeVttTiming_, this.manifestType_);
  739.   }
  741.   /**
  742.    * @return {boolean} True if the MediaSource is in an "ended" state, or if the
  743.    *   object has been destroyed.
  744.    */
  745.   ended() {
  746.     if (this.reloadingMediaSource_) {
  747.       return false;
  748.     }
  749.     return this.mediaSource_ ? this.mediaSource_.readyState == 'ended' : true;
  750.   }
  752.   /**
  753.    * @return {boolean} True if the MediaSource is in an "closed" state, or if
  754.    *   the object has been destroyed.
  755.    */
  756.   closed() {
  757.     if (this.reloadingMediaSource_) {
  758.       return false;
  759.     }
  760.     return this.mediaSource_ ? this.mediaSource_.readyState == 'closed' : true;
  761.   }
  763.   /**
  764.    * Gets the first timestamp in buffer for the given content type.
  765.    *
  766.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  767.    * @return {?number} The timestamp in seconds, or null if nothing is buffered.
  768.    */
  769.   bufferStart(contentType) {
  770.     if (!Object.keys(this.sourceBuffers_).length) {
  771.       return null;
  772.     }
  773.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  774.     if (contentType == ContentType.TEXT) {
  775.       return this.textEngine_.bufferStart();
  776.     }
  777.     return shaka.media.TimeRangesUtils.bufferStart(
  778.         this.getBuffered_(contentType));
  779.   }
  781.   /**
  782.    * Gets the last timestamp in buffer for the given content type.
  783.    *
  784.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  785.    * @return {?number} The timestamp in seconds, or null if nothing is buffered.
  786.    */
  787.   bufferEnd(contentType) {
  788.     if (!Object.keys(this.sourceBuffers_).length) {
  789.       return null;
  790.     }
  791.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  792.     if (contentType == ContentType.TEXT) {
  793.       return this.textEngine_.bufferEnd();
  794.     }
  795.     return shaka.media.TimeRangesUtils.bufferEnd(
  796.         this.getBuffered_(contentType));
  797.   }
  799.   /**
  800.    * Determines if the given time is inside the buffered range of the given
  801.    * content type.
  802.    *
  803.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  804.    * @param {number} time Playhead time
  805.    * @return {boolean}
  806.    */
  807.   isBuffered(contentType, time) {
  808.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  809.     if (contentType == ContentType.TEXT) {
  810.       return this.textEngine_.isBuffered(time);
  811.     } else {
  812.       const buffered = this.getBuffered_(contentType);
  813.       return shaka.media.TimeRangesUtils.isBuffered(buffered, time);
  814.     }
  815.   }
  817.   /**
  818.    * Computes how far ahead of the given timestamp is buffered for the given
  819.    * content type.
  820.    *
  821.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  822.    * @param {number} time
  823.    * @return {number} The amount of time buffered ahead in seconds.
  824.    */
  825.   bufferedAheadOf(contentType, time) {
  826.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  827.     if (contentType == ContentType.TEXT) {
  828.       return this.textEngine_.bufferedAheadOf(time);
  829.     } else {
  830.       const buffered = this.getBuffered_(contentType);
  831.       return shaka.media.TimeRangesUtils.bufferedAheadOf(buffered, time);
  832.     }
  833.   }
  835.   /**
  836.    * Returns info about what is currently buffered.
  837.    * @return {shaka.extern.BufferedInfo}
  838.    */
  839.   getBufferedInfo() {
  840.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  841.     const TimeRangesUtils = shaka.media.TimeRangesUtils;
  843.     const info = {
  844.       total: this.reloadingMediaSource_ ? [] :
  845.         TimeRangesUtils.getBufferedInfo(this.video_.buffered),
  846.       audio:
  847.         TimeRangesUtils.getBufferedInfo(this.getBuffered_(ContentType.AUDIO)),
  848.       video:
  849.         TimeRangesUtils.getBufferedInfo(this.getBuffered_(ContentType.VIDEO)),
  850.       text: [],
  851.     };
  853.     if (this.textEngine_) {
  854.       const start = this.textEngine_.bufferStart();
  855.       const end = this.textEngine_.bufferEnd();
  857.       if (start != null && end != null) {
  858.         info.text.push({start: start, end: end});
  859.       }
  860.     }
  861.     return info;
  862.   }
  864.   /**
  865.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  866.    * @return {TimeRanges} The buffered ranges for the given content type, or
  867.    *   null if the buffered ranges could not be obtained.
  868.    * @private
  869.    */
  870.   getBuffered_(contentType) {
  871.     if (this.reloadingMediaSource_ || this.usingRemotePlayback_) {
  872.       return null;
  873.     }
  874.     try {
  875.       return this.sourceBuffers_[contentType].buffered;
  876.     } catch (exception) {
  877.       if (contentType in this.sourceBuffers_) {
  878.         // Note: previous MediaSource errors may cause access to |buffered| to
  879.         // throw.
  880.         shaka.log.error('failed to get buffered range for ' + contentType,
  881.             exception);
  882.       }
  883.       return null;
  884.     }
  885.   }
  887.   /**
  888.    * Create a new closed caption parser. This will ONLY be replaced by tests as
  889.    * a way to inject fake closed caption parser instances.
  890.    *
  891.    * @param {string} mimeType
  892.    * @return {!shaka.media.IClosedCaptionParser}
  893.    */
  894.   getCaptionParser(mimeType) {
  895.     return new shaka.media.ClosedCaptionParser(mimeType);
  896.   }
  898.   /**
  899.    * This method is only public for testing.
  900.    *
  901.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  902.    * @param {!BufferSource} data
  903.    * @param {!shaka.media.SegmentReference} reference The segment reference
  904.    *   we are appending
  905.    * @param {shaka.extern.Stream} stream
  906.    * @param {!string} mimeType
  907.    * @return {{timestamp: ?number, metadata: !Array<shaka.extern.ID3Metadata>}}
  908.    */
  909.   getTimestampAndDispatchMetadata(contentType, data, reference, stream,
  910.       mimeType) {
  911.     let timestamp = null;
  912.     let metadata = [];
  914.     const uint8ArrayData = shaka.util.BufferUtils.toUint8(data);
  915.     if (shaka.util.MimeUtils.RAW_FORMATS.includes(mimeType)) {
  916.       const frames = shaka.util.Id3Utils.getID3Frames(uint8ArrayData);
  917.       if (frames.length && reference) {
  918.         const metadataTimestamp = frames.find((frame) => {
  919.           return frame.description ===
  920.               'com.apple.streaming.transportStreamTimestamp';
  921.         });
  922.         if (metadataTimestamp) {
  923.           timestamp = Math.round(metadataTimestamp.data) / 1000;
  924.         }
  925.         /** @private {shaka.extern.ID3Metadata} */
  926.         const id3Metadata = {
  927.           cueTime: reference.startTime,
  928.           data: uint8ArrayData,
  929.           frames: frames,
  930.           dts: reference.startTime,
  931.           pts: reference.startTime,
  932.         };
  933.         this.playerInterface_.onMetadata(
  934.             [id3Metadata], /* offset= */ 0, reference.endTime);
  935.       }
  936.     } else if (mimeType.includes('/mp4') &&
  937.         reference &&
  938.         reference.initSegmentReference &&
  939.         reference.initSegmentReference.timescale) {
  940.       const timescale = reference.initSegmentReference.timescale;
  941.       if (!isNaN(timescale)) {
  942.         const hasEmsg = ((stream.emsgSchemeIdUris != null &&
  943.             stream.emsgSchemeIdUris.length > 0) ||
  944.             this.config_.dispatchAllEmsgBoxes);
  945.         const Mp4Parser = shaka.util.Mp4Parser;
  946.         let startTime = 0;
  947.         let parsedMedia = false;
  948.         const parser = new Mp4Parser();
  949.         if (hasEmsg) {
  950.           parser.fullBox('emsg', (box) =>
  951.             this.parseEMSG_(reference, stream.emsgSchemeIdUris, box));
  952.         }
  953.         parser.fullBox('prft', (box) => this.parsePrft_(timescale, box))
  954.             .box('moof', Mp4Parser.children)
  955.             .box('traf', Mp4Parser.children)
  956.             .fullBox('tfdt', (box) => {
  957.               if (!parsedMedia) {
  958.                 goog.asserts.assert(
  959.                     box.version == 0 || box.version == 1,
  960.                     'TFDT version can only be 0 or 1');
  961.                 const parsed = shaka.util.Mp4BoxParsers.parseTFDTInaccurate(
  962.                     box.reader, box.version);
  963.                 startTime = parsed.baseMediaDecodeTime / timescale;
  964.                 parsedMedia = true;
  965.                 if (!hasEmsg) {
  966.                   box.parser.stop();
  967.                 }
  968.               }
  969.             }).parse(data, /* partialOkay= */ true);
  970.         if (parsedMedia && reference.timestampOffset == 0) {
  971.           timestamp = startTime;
  972.         }
  973.       }
  974.     } else if (!mimeType.includes('/mp4') && !mimeType.includes('/webm') &&
  975.         shaka.util.TsParser.probe(uint8ArrayData)) {
  976.       if (!this.tsParsers_[contentType]) {
  977.         this.tsParsers_[contentType] = new shaka.util.TsParser();
  978.       } else {
  979.         this.tsParsers_[contentType].clearData();
  980.       }
  981.       const tsParser = this.tsParsers_[contentType].parse(uint8ArrayData);
  982.       const startTime = tsParser.getStartTime(contentType);
  983.       if (startTime != null) {
  984.         timestamp = startTime;
  985.       }
  986.       metadata = tsParser.getMetadata();
  987.     }
  988.     return {timestamp, metadata};
  989.   }
  992.   /**
  993.    * Parse the EMSG box from a MP4 container.
  994.    *
  995.    * @param {!shaka.media.SegmentReference} reference
  996.    * @param {?Array<string>} emsgSchemeIdUris Array of emsg
  997.    *     scheme_id_uri for which emsg boxes should be parsed.
  998.    * @param {!shaka.extern.ParsedBox} box
  999.    * @private
  1000.    * https://dashif-documents.azurewebsites.net/Events/master/event.html#emsg-format
  1001.    * aligned(8) class DASHEventMessageBox
  1002.    *    extends FullBox(‘emsg’, version, flags = 0){
  1003.    * if (version==0) {
  1004.    *   string scheme_id_uri;
  1005.    *   string value;
  1006.    *   unsigned int(32) timescale;
  1007.    *   unsigned int(32) presentation_time_delta;
  1008.    *   unsigned int(32) event_duration;
  1009.    *   unsigned int(32) id;
  1010.    * } else if (version==1) {
  1011.    *   unsigned int(32) timescale;
  1012.    *   unsigned int(64) presentation_time;
  1013.    *   unsigned int(32) event_duration;
  1014.    *   unsigned int(32) id;
  1015.    *   string scheme_id_uri;
  1016.    *   string value;
  1017.    * }
  1018.    * unsigned int(8) message_data[];
  1019.    */
  1020.   parseEMSG_(reference, emsgSchemeIdUris, box) {
  1021.     let timescale;
  1022.     let id;
  1023.     let eventDuration;
  1024.     let schemeId;
  1025.     let startTime;
  1026.     let presentationTimeDelta;
  1027.     let value;
  1029.     if (box.version === 0) {
  1030.       schemeId = box.reader.readTerminatedString();
  1031.       value = box.reader.readTerminatedString();
  1032.       timescale = box.reader.readUint32();
  1033.       presentationTimeDelta = box.reader.readUint32();
  1034.       eventDuration = box.reader.readUint32();
  1035.       id = box.reader.readUint32();
  1036.       startTime = reference.startTime + (presentationTimeDelta / timescale);
  1037.     } else {
  1038.       timescale = box.reader.readUint32();
  1039.       const pts = box.reader.readUint64();
  1040.       startTime = (pts / timescale) + reference.timestampOffset;
  1041.       presentationTimeDelta = startTime - reference.startTime;
  1042.       eventDuration = box.reader.readUint32();
  1043.       id = box.reader.readUint32();
  1044.       schemeId = box.reader.readTerminatedString();
  1045.       value = box.reader.readTerminatedString();
  1046.     }
  1047.     const messageData = box.reader.readBytes(
  1048.         box.reader.getLength() - box.reader.getPosition());
  1050.     // See DASH sec. 5.10.3.3.1
  1051.     // If a DASH client detects an event message box with a scheme that is not
  1052.     // defined in MPD, the client is expected to ignore it.
  1053.     if ((emsgSchemeIdUris && emsgSchemeIdUris.includes(schemeId)) ||
  1054.         this.config_.dispatchAllEmsgBoxes) {
  1055.       // See DASH sec. 5.10.4.1
  1056.       // A special scheme in DASH used to signal manifest updates.
  1057.       if (schemeId == 'urn:mpeg:dash:event:2012') {
  1058.         this.playerInterface_.onManifestUpdate();
  1059.       } else {
  1060.         // All other schemes are dispatched as a general 'emsg' event.
  1061.         const endTime = startTime + (eventDuration / timescale);
  1062.         /** @type {shaka.extern.EmsgInfo} */
  1063.         const emsg = {
  1064.           startTime: startTime,
  1065.           endTime: endTime,
  1066.           schemeIdUri: schemeId,
  1067.           value: value,
  1068.           timescale: timescale,
  1069.           presentationTimeDelta: presentationTimeDelta,
  1070.           eventDuration: eventDuration,
  1071.           id: id,
  1072.           messageData: messageData,
  1073.         };
  1075.         // Dispatch an event to notify the application about the emsg box.
  1076.         const eventName = shaka.util.FakeEvent.EventName.Emsg;
  1077.         const data = (new Map()).set('detail', emsg);
  1078.         const event = new shaka.util.FakeEvent(eventName, data);
  1079.         // A user can call preventDefault() on a cancelable event.
  1080.         event.cancelable = true;
  1082.         this.playerInterface_.onEvent(event);
  1084.         if (event.defaultPrevented) {
  1085.           // If the caller uses preventDefault() on the 'emsg' event, don't
  1086.           // process any further, and don't generate an ID3 'metadata' event
  1087.           // for the same data.
  1088.           return;
  1089.         }
  1091.         // Additionally, ID3 events generate a 'metadata' event.  This is a
  1092.         // pre-parsed version of the metadata blob already dispatched in the
  1093.         // 'emsg' event.
  1094.         if (schemeId == 'https://aomedia.org/emsg/ID3' ||
  1095.             schemeId == 'https://developer.apple.com/streaming/emsg-id3') {
  1096.           // See https://aomediacodec.github.io/id3-emsg/
  1097.           const frames = shaka.util.Id3Utils.getID3Frames(messageData);
  1098.           if (frames.length) {
  1099.             /** @private {shaka.extern.ID3Metadata} */
  1100.             const metadata = {
  1101.               cueTime: startTime,
  1102.               data: messageData,
  1103.               frames: frames,
  1104.               dts: startTime,
  1105.               pts: startTime,
  1106.             };
  1107.             this.playerInterface_.onMetadata(
  1108.                 [metadata], /* offset= */ 0, endTime);
  1109.           }
  1110.         }
  1111.       }
  1112.     }
  1113.   }
  1115.   /**
  1116.    * Parse PRFT box.
  1117.    * @param {number} timescale
  1118.    * @param {!shaka.extern.ParsedBox} box
  1119.    * @private
  1120.    */
  1121.   parsePrft_(timescale, box) {
  1122.     goog.asserts.assert(
  1123.         box.version == 0 || box.version == 1,
  1124.         'PRFT version can only be 0 or 1');
  1125.     const parsed = shaka.util.Mp4BoxParsers.parsePRFTInaccurate(
  1126.         box.reader, box.version);
  1128.     const wallClockTime = this.convertNtp_(parsed.ntpTimestamp);
  1129.     const programStartDate = new Date(wallClockTime -
  1130.       (parsed.mediaTime / timescale) * 1000);
  1131.     /** @type {shaka.extern.ProducerReferenceTime} */
  1132.     const prftInfo = {
  1133.       wallClockTime,
  1134.       programStartDate,
  1135.     };
  1137.     const eventName = shaka.util.FakeEvent.EventName.Prft;
  1138.     const data = (new Map()).set('detail', prftInfo);
  1139.     const event = new shaka.util.FakeEvent(
  1140.         eventName, data);
  1141.     this.playerInterface_.onEvent(event);
  1142.   }
  1145.   /**
  1146.    * Convert Ntp ntpTimeStamp to UTC Time
  1147.    *
  1148.    * @param {number} ntpTimeStamp
  1149.    * @return {number} utcTime
  1150.    * @private
  1151.    */
  1152.   convertNtp_(ntpTimeStamp) {
  1153.     const start = new Date(Date.UTC(1900, 0, 1, 0, 0, 0));
  1154.     return new Date(start.getTime() + ntpTimeStamp).getTime();
  1155.   }
  1157.   /**
  1158.    * Enqueue an operation to append data to the SourceBuffer.
  1159.    * Start and end times are needed for TextEngine, but not for MediaSource.
  1160.    * Start and end times may be null for initialization segments; if present
  1161.    * they are relative to the presentation timeline.
  1162.    *
  1163.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1164.    * @param {!BufferSource} data
  1165.    * @param {?shaka.media.SegmentReference} reference The segment reference
  1166.    *   we are appending, or null for init segments
  1167.    * @param {shaka.extern.Stream} stream
  1168.    * @param {?boolean} hasClosedCaptions True if the buffer contains CEA closed
  1169.    *   captions
  1170.    * @param {boolean=} seeked True if we just seeked
  1171.    * @param {boolean=} adaptation True if we just automatically switched active
  1172.    *   variant(s).
  1173.    * @param {boolean=} isChunkedData True if we add to the buffer from the
  1174.    *   partial read of the segment.
  1175.    * @return {!Promise}
  1176.    */
  1177.   async appendBuffer(
  1178.       contentType, data, reference, stream, hasClosedCaptions, seeked = false,
  1179.       adaptation = false, isChunkedData = false, fromSplit = false) {
  1180.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1182.     if (contentType == ContentType.TEXT) {
  1183.       if (this.manifestType_ == shaka.media.ManifestParser.HLS) {
  1184.         // This won't be known until the first video segment is appended.
  1185.         const offset = await this.textSequenceModeOffset_;
  1186.         this.textEngine_.setTimestampOffset(offset);
  1187.       }
  1188.       await this.textEngine_.appendBuffer(
  1189.           data,
  1190.           reference ? reference.startTime : null,
  1191.           reference ? reference.endTime : null,
  1192.           reference ? reference.getUris()[0] : null);
  1193.       return;
  1194.     }
  1196.     if (!fromSplit && this.needSplitMuxedContent_) {
  1197.       await this.appendBuffer(ContentType.AUDIO, data, reference, stream,
  1198.           hasClosedCaptions, seeked, adaptation, isChunkedData,
  1199.           /* fromSplit= */ true);
  1200.       await this.appendBuffer(ContentType.VIDEO, data, reference, stream,
  1201.           hasClosedCaptions, seeked, adaptation, isChunkedData,
  1202.           /* fromSplit= */ true);
  1203.       return;
  1204.     }
  1206.     if (!this.sourceBuffers_[contentType]) {
  1207.       shaka.log.warning('Attempted to restore a non-existent source buffer');
  1208.       return;
  1209.     }
  1211.     let timestampOffset = this.sourceBuffers_[contentType].timestampOffset;
  1213.     let mimeType = this.sourceBufferTypes_[contentType];
  1214.     if (this.transmuxers_[contentType]) {
  1215.       mimeType = this.transmuxers_[contentType].getOriginalMimeType();
  1216.     }
  1217.     if (reference) {
  1218.       const {timestamp, metadata} = this.getTimestampAndDispatchMetadata(
  1219.           contentType, data, reference, stream, mimeType);
  1220.       if (timestamp != null) {
  1221.         if (this.firstVideoTimestamp_ == null &&
  1222.             contentType == ContentType.VIDEO) {
  1223.           this.firstVideoTimestamp_ = timestamp;
  1224.           this.firstVideoReferenceStartTime_ = reference.startTime;
  1225.           if (this.firstAudioTimestamp_ != null) {
  1226.             let compensation = 0;
  1227.             // Only apply compensation if video and audio segment startTime
  1228.             // match, to avoid introducing sync issues.
  1229.             if (this.firstVideoReferenceStartTime_ ==
  1230.                 this.firstAudioReferenceStartTime_) {
  1231.               compensation =
  1232.                   this.firstVideoTimestamp_ - this.firstAudioTimestamp_;
  1233.             }
  1234.             this.audioCompensation_.resolve(compensation);
  1235.           }
  1236.         }
  1237.         if (this.firstAudioTimestamp_ == null &&
  1238.             contentType == ContentType.AUDIO) {
  1239.           this.firstAudioTimestamp_ = timestamp;
  1240.           this.firstAudioReferenceStartTime_ = reference.startTime;
  1241.           if (this.firstVideoTimestamp_ != null) {
  1242.             let compensation = 0;
  1243.             // Only apply compensation if video and audio segment startTime
  1244.             // match, to avoid introducing sync issues.
  1245.             if (this.firstVideoReferenceStartTime_ ==
  1246.                 this.firstAudioReferenceStartTime_) {
  1247.               compensation =
  1248.                   this.firstVideoTimestamp_ - this.firstAudioTimestamp_;
  1249.             }
  1250.             this.audioCompensation_.resolve(compensation);
  1251.           }
  1252.         }
  1253.         let realTimestamp = timestamp;
  1254.         const RAW_FORMATS = shaka.util.MimeUtils.RAW_FORMATS;
  1255.         // For formats without containers and using segments mode, we need to
  1256.         // adjust TimestampOffset relative to 0 because segments do not have
  1257.         // any timestamp information.
  1258.         if (!this.sequenceMode_ &&
  1259.             RAW_FORMATS.includes(this.sourceBufferTypes_[contentType])) {
  1260.           realTimestamp = 0;
  1261.         }
  1262.         const calculatedTimestampOffset = reference.startTime - realTimestamp;
  1263.         const timestampOffsetDifference =
  1264.             Math.abs(timestampOffset - calculatedTimestampOffset);
  1265.         if ((timestampOffsetDifference >= 0.001 || seeked || adaptation) &&
  1266.             (!isChunkedData || calculatedTimestampOffset > 0 ||
  1267.             !timestampOffset)) {
  1268.           timestampOffset = calculatedTimestampOffset;
  1269.           if (this.attemptTimestampOffsetCalculation_) {
  1270.             this.enqueueOperation_(
  1271.                 contentType,
  1272.                 () => this.abort_(contentType),
  1273.                 null);
  1274.             this.enqueueOperation_(
  1275.                 contentType,
  1276.                 () => this.setTimestampOffset_(contentType, timestampOffset),
  1277.                 null);
  1278.           }
  1279.         }
  1280.         // Timestamps can only be reliably extracted from video, not audio.
  1281.         // Packed audio formats do not have internal timestamps at all.
  1282.         // Prefer video for this when available.
  1283.         const isBestSourceBufferForTimestamps =
  1284.             contentType == ContentType.VIDEO ||
  1285.             !(ContentType.VIDEO in this.sourceBuffers_);
  1286.         if (isBestSourceBufferForTimestamps) {
  1287.           this.textSequenceModeOffset_.resolve(timestampOffset);
  1288.         }
  1289.       }
  1290.       if (metadata.length) {
  1291.         this.playerInterface_.onMetadata(metadata, timestampOffset,
  1292.             reference ? reference.endTime : null);
  1293.       }
  1294.     }
  1295.     if (hasClosedCaptions && contentType == ContentType.VIDEO) {
  1296.       if (!this.textEngine_) {
  1297.         this.reinitText(shaka.util.MimeUtils.CEA608_CLOSED_CAPTION_MIMETYPE,
  1298.             this.sequenceMode_, /* external= */ false);
  1299.       }
  1300.       if (!this.captionParser_) {
  1301.         const basicType = mimeType.split(';', 1)[0];
  1302.         this.captionParser_ = this.getCaptionParser(basicType);
  1303.       }
  1304.       // If it is the init segment for closed captions, initialize the closed
  1305.       // caption parser.
  1306.       if (!reference) {
  1307.         this.captionParser_.init(data, adaptation);
  1308.       } else {
  1309.         const closedCaptions = this.captionParser_.parseFrom(data);
  1310.         if (closedCaptions.length) {
  1311.           this.textEngine_.storeAndAppendClosedCaptions(
  1312.               closedCaptions,
  1313.               reference.startTime,
  1314.               reference.endTime,
  1315.               timestampOffset);
  1316.         }
  1317.       }
  1318.     }
  1320.     if (this.transmuxers_[contentType]) {
  1321.       data = await this.transmuxers_[contentType].transmux(
  1322.           data, stream, reference, this.mediaSource_.duration, contentType);
  1323.     }
  1325.     data = this.workAroundBrokenPlatforms_(
  1326.         data, reference ? reference.startTime : null, contentType,
  1327.         reference ? reference.getUris()[0] : null);
  1329.     if (reference && this.sequenceMode_ && contentType != ContentType.TEXT) {
  1330.       // In sequence mode, for non-text streams, if we just cleared the buffer
  1331.       // and are either performing an unbuffered seek or handling an automatic
  1332.       // adaptation, we need to set a new timestampOffset on the sourceBuffer.
  1333.       if (seeked || adaptation) {
  1334.         let timestampOffset = reference.startTime;
  1335.         // Audio and video may not be aligned, so we will compensate for audio
  1336.         // if necessary.
  1337.         if (this.manifestType_ == shaka.media.ManifestParser.HLS &&
  1338.             !this.needSplitMuxedContent_ &&
  1339.             contentType == ContentType.AUDIO &&
  1340.             this.sourceBuffers_[ContentType.VIDEO]) {
  1341.           const compensation = await this.audioCompensation_;
  1342.           // Only apply compensation if the difference is greater than 100ms
  1343.           if (Math.abs(compensation) > 0.1) {
  1344.             timestampOffset -= compensation;
  1345.           }
  1346.         }
  1347.         // The logic to call abort() before setting the timestampOffset is
  1348.         // extended during unbuffered seeks or automatic adaptations; it is
  1349.         // possible for the append state to be PARSING_MEDIA_SEGMENT from the
  1350.         // previous SourceBuffer#appendBuffer() call.
  1351.         this.enqueueOperation_(
  1352.             contentType,
  1353.             () => this.abort_(contentType),
  1354.             null);
  1355.         this.enqueueOperation_(
  1356.             contentType,
  1357.             () => this.setTimestampOffset_(contentType, timestampOffset),
  1358.             null);
  1359.       }
  1360.     }
  1362.     let bufferedBefore = null;
  1364.     await this.enqueueOperation_(contentType, () => {
  1365.       if (goog.DEBUG && reference && !reference.isPreload() && !isChunkedData) {
  1366.         bufferedBefore = this.getBuffered_(contentType);
  1367.       }
  1368.       this.append_(contentType, data, timestampOffset);
  1369.     }, reference ? reference.getUris()[0] : null);
  1371.     if (goog.DEBUG && reference && !reference.isPreload() && !isChunkedData) {
  1372.       const bufferedAfter = this.getBuffered_(contentType);
  1373.       const newBuffered = shaka.media.TimeRangesUtils.computeAddedRange(
  1374.           bufferedBefore, bufferedAfter);
  1375.       if (newBuffered) {
  1376.         const segmentDuration = reference.endTime - reference.startTime;
  1377.         const timeAdded = newBuffered.end - newBuffered.start;
  1378.         // Check end times instead of start times.  We may be overwriting a
  1379.         // buffer and only the end changes, and that would be fine.
  1380.         // Also, exclude tiny segments.  Sometimes alignment segments as small
  1381.         // as 33ms are seen in Google DAI content.  For such tiny segments,
  1382.         // half a segment duration would be no issue.
  1383.         const offset = Math.abs(newBuffered.end - reference.endTime);
  1384.         if (segmentDuration > 0.100 && (offset > segmentDuration / 2 ||
  1385.             Math.abs(segmentDuration - timeAdded) > 0.030)) {
  1386.           shaka.log.error('Possible encoding problem detected!',
  1387.               'Unexpected buffered range for reference', reference,
  1388.               'from URIs', reference.getUris(),
  1389.               'should be', {start: reference.startTime, end: reference.endTime},
  1390.               'but got', newBuffered);
  1391.         }
  1392.       }
  1393.     }
  1394.   }
  1396.   /**
  1397.    * Set the selected closed captions Id and language.
  1398.    *
  1399.    * @param {string} id
  1400.    */
  1401.   setSelectedClosedCaptionId(id) {
  1402.     const VIDEO = shaka.util.ManifestParserUtils.ContentType.VIDEO;
  1403.     const videoBufferEndTime = this.bufferEnd(VIDEO) || 0;
  1404.     this.textEngine_.setSelectedClosedCaptionId(id, videoBufferEndTime);
  1405.   }
  1407.   /** Disable embedded closed captions. */
  1408.   clearSelectedClosedCaptionId() {
  1409.     if (this.textEngine_) {
  1410.       this.textEngine_.setSelectedClosedCaptionId('', 0);
  1411.     }
  1412.   }
  1414.   /**
  1415.    * Enqueue an operation to remove data from the SourceBuffer.
  1416.    *
  1417.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1418.    * @param {number} startTime relative to the start of the presentation
  1419.    * @param {number} endTime relative to the start of the presentation
  1420.    * @return {!Promise}
  1421.    */
  1422.   async remove(contentType, startTime, endTime) {
  1423.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1424.     if (contentType == ContentType.TEXT) {
  1425.       await this.textEngine_.remove(startTime, endTime);
  1426.     } else {
  1427.       await this.enqueueOperation_(
  1428.           contentType,
  1429.           () => this.remove_(contentType, startTime, endTime),
  1430.           null);
  1431.       if (this.needSplitMuxedContent_) {
  1432.         await this.enqueueOperation_(
  1433.             ContentType.AUDIO,
  1434.             () => this.remove_(ContentType.AUDIO, startTime, endTime),
  1435.             null);
  1436.       }
  1437.     }
  1438.   }
  1440.   /**
  1441.    * Enqueue an operation to clear the SourceBuffer.
  1442.    *
  1443.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1444.    * @return {!Promise}
  1445.    */
  1446.   async clear(contentType) {
  1447.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1448.     if (contentType == ContentType.TEXT) {
  1449.       if (!this.textEngine_) {
  1450.         return;
  1451.       }
  1452.       await this.textEngine_.remove(0, Infinity);
  1453.     } else {
  1454.       // Note that not all platforms allow clearing to Infinity.
  1455.       await this.enqueueOperation_(
  1456.           contentType,
  1457.           () => this.remove_(contentType, 0, this.mediaSource_.duration),
  1458.           null);
  1459.       if (this.needSplitMuxedContent_) {
  1460.         await this.enqueueOperation_(
  1461.             ContentType.AUDIO,
  1462.             () => this.remove_(
  1463.                 ContentType.AUDIO, 0, this.mediaSource_.duration),
  1464.             null);
  1465.       }
  1466.     }
  1467.   }
  1469.   /**
  1470.    * Fully reset the state of the caption parser owned by MediaSourceEngine.
  1471.    */
  1472.   resetCaptionParser() {
  1473.     if (this.captionParser_) {
  1474.       this.captionParser_.reset();
  1475.     }
  1476.   }
  1478.   /**
  1479.    * Enqueue an operation to flush the SourceBuffer.
  1480.    * This is a workaround for what we believe is a Chromecast bug.
  1481.    *
  1482.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1483.    * @return {!Promise}
  1484.    */
  1485.   async flush(contentType) {
  1486.     // Flush the pipeline.  Necessary on Chromecast, even though we have removed
  1487.     // everything.
  1488.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1489.     if (contentType == ContentType.TEXT) {
  1490.       // Nothing to flush for text.
  1491.       return;
  1492.     }
  1493.     await this.enqueueOperation_(
  1494.         contentType,
  1495.         () => this.flush_(contentType),
  1496.         null);
  1497.     if (this.needSplitMuxedContent_) {
  1498.       await this.enqueueOperation_(
  1499.           ContentType.AUDIO,
  1500.           () => this.flush_(ContentType.AUDIO),
  1501.           null);
  1502.     }
  1503.   }
  1505.   /**
  1506.    * Sets the timestamp offset and append window end for the given content type.
  1507.    *
  1508.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1509.    * @param {number} timestampOffset The timestamp offset.  Segments which start
  1510.    *   at time t will be inserted at time t + timestampOffset instead.  This
  1511.    *   value does not affect segments which have already been inserted.
  1512.    * @param {number} appendWindowStart The timestamp to set the append window
  1513.    *   start to.  For future appends, frames/samples with timestamps less than
  1514.    *   this value will be dropped.
  1515.    * @param {number} appendWindowEnd The timestamp to set the append window end
  1516.    *   to.  For future appends, frames/samples with timestamps greater than this
  1517.    *   value will be dropped.
  1518.    * @param {boolean} ignoreTimestampOffset  If true, the timestampOffset will
  1519.    *   not be applied in this step.
  1520.    * @param {string} mimeType
  1521.    * @param {string} codecs
  1522.    * @param {!Map<shaka.util.ManifestParserUtils.ContentType,
  1523.    *               shaka.extern.Stream>} streamsByType
  1524.    *   A map of content types to streams.  All streams must be supported
  1525.    *   according to MediaSourceEngine.isStreamSupported.
  1526.    *
  1527.    * @return {!Promise}
  1528.    */
  1529.   async setStreamProperties(
  1530.       contentType, timestampOffset, appendWindowStart, appendWindowEnd,
  1531.       ignoreTimestampOffset, mimeType, codecs, streamsByType) {
  1532.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1533.     if (contentType == ContentType.TEXT) {
  1534.       if (!ignoreTimestampOffset) {
  1535.         this.textEngine_.setTimestampOffset(timestampOffset);
  1536.       }
  1537.       this.textEngine_.setAppendWindow(appendWindowStart, appendWindowEnd);
  1538.       return;
  1539.     }
  1540.     const operations = [];
  1542.     const hasChangedCodecs = await this.codecSwitchIfNecessary_(
  1543.         contentType, mimeType, codecs, streamsByType);
  1545.     if (!hasChangedCodecs) {
  1546.       // Queue an abort() to help MSE splice together overlapping segments.
  1547.       // We set appendWindowEnd when we change periods in DASH content, and the
  1548.       // period transition may result in overlap.
  1549.       //
  1550.       // An abort() also helps with MPEG2-TS.  When we append a TS segment, we
  1551.       // always enter a PARSING_MEDIA_SEGMENT state and we can't change the
  1552.       // timestamp offset.  By calling abort(), we reset the state so we can
  1553.       // set it.
  1554.       operations.push(this.enqueueOperation_(
  1555.           contentType,
  1556.           () => this.abort_(contentType),
  1557.           null));
  1558.       if (this.needSplitMuxedContent_) {
  1559.         operations.push(this.enqueueOperation_(
  1560.             ContentType.AUDIO,
  1561.             () => this.abort_(ContentType.AUDIO),
  1562.             null));
  1563.       }
  1564.     }
  1565.     if (!ignoreTimestampOffset) {
  1566.       operations.push(this.enqueueOperation_(
  1567.           contentType,
  1568.           () => this.setTimestampOffset_(contentType, timestampOffset),
  1569.           null));
  1570.       if (this.needSplitMuxedContent_) {
  1571.         operations.push(this.enqueueOperation_(
  1572.             ContentType.AUDIO,
  1573.             () => this.setTimestampOffset_(
  1574.                 ContentType.AUDIO, timestampOffset),
  1575.             null));
  1576.       }
  1577.     }
  1578.     if (appendWindowStart != 0 || appendWindowEnd != Infinity) {
  1579.       operations.push(this.enqueueOperation_(
  1580.           contentType,
  1581.           () => this.setAppendWindow_(
  1582.               contentType, appendWindowStart, appendWindowEnd),
  1583.           null));
  1584.       if (this.needSplitMuxedContent_) {
  1585.         operations.push(this.enqueueOperation_(
  1586.             ContentType.AUDIO,
  1587.             () => this.setAppendWindow_(
  1588.                 ContentType.AUDIO, appendWindowStart, appendWindowEnd),
  1589.             null));
  1590.       }
  1591.     }
  1593.     if (operations.length) {
  1594.       await Promise.all(operations);
  1595.     }
  1596.   }
  1598.   /**
  1599.    * Adjust timestamp offset to maintain AV sync across discontinuities.
  1600.    *
  1601.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1602.    * @param {number} timestampOffset
  1603.    * @return {!Promise}
  1604.    */
  1605.   async resync(contentType, timestampOffset) {
  1606.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1608.     if (contentType == ContentType.TEXT) {
  1609.       // This operation is for audio and video only.
  1610.       return;
  1611.     }
  1613.     // Reset the promise in case the timestamp offset changed during
  1614.     // a period/discontinuity transition.
  1615.     if (contentType == ContentType.VIDEO) {
  1616.       this.textSequenceModeOffset_ = new shaka.util.PublicPromise();
  1617.     }
  1619.     if (!this.sequenceMode_) {
  1620.       return;
  1621.     }
  1623.     // Avoid changing timestampOffset when the difference is less than 100 ms
  1624.     // from the end of the current buffer.
  1625.     const bufferEnd = this.bufferEnd(contentType);
  1626.     if (bufferEnd && Math.abs(bufferEnd - timestampOffset) < 0.1) {
  1627.       return;
  1628.     }
  1630.     // Queue an abort() to help MSE splice together overlapping segments.
  1631.     // We set appendWindowEnd when we change periods in DASH content, and the
  1632.     // period transition may result in overlap.
  1633.     //
  1634.     // An abort() also helps with MPEG2-TS.  When we append a TS segment, we
  1635.     // always enter a PARSING_MEDIA_SEGMENT state and we can't change the
  1636.     // timestamp offset.  By calling abort(), we reset the state so we can
  1637.     // set it.
  1638.     this.enqueueOperation_(
  1639.         contentType,
  1640.         () => this.abort_(contentType),
  1641.         null);
  1642.     if (this.needSplitMuxedContent_) {
  1643.       this.enqueueOperation_(
  1644.           ContentType.AUDIO,
  1645.           () => this.abort_(ContentType.AUDIO),
  1646.           null);
  1647.     }
  1648.     await this.enqueueOperation_(
  1649.         contentType,
  1650.         () => this.setTimestampOffset_(contentType, timestampOffset),
  1651.         null);
  1652.     if (this.needSplitMuxedContent_) {
  1653.       await this.enqueueOperation_(
  1654.           ContentType.AUDIO,
  1655.           () => this.setTimestampOffset_(ContentType.AUDIO, timestampOffset),
  1656.           null);
  1657.     }
  1658.   }
  1660.   /**
  1661.    * @param {string=} reason Valid reasons are 'network' and 'decode'.
  1662.    * @return {!Promise}
  1663.    * @see http://w3c.github.io/media-source/#idl-def-EndOfStreamError
  1664.    */
  1665.   async endOfStream(reason) {
  1666.     await this.enqueueBlockingOperation_(() => {
  1667.       // If endOfStream() has already been called on the media source,
  1668.       // don't call it again. Also do not call if readyState is
  1669.       // 'closed' (not attached to video element) since it is not a
  1670.       // valid operation.
  1671.       if (this.ended() || this.closed()) {
  1672.         return;
  1673.       }
  1674.       // Tizen won't let us pass undefined, but it will let us omit the
  1675.       // argument.
  1676.       if (reason) {
  1677.         this.mediaSource_.endOfStream(reason);
  1678.       } else {
  1679.         this.mediaSource_.endOfStream();
  1680.       }
  1681.     });
  1682.   }
  1684.   /**
  1685.    * @param {number} duration
  1686.    * @return {!Promise}
  1687.    */
  1688.   async setDuration(duration) {
  1689.     await this.enqueueBlockingOperation_(() => {
  1690.       // Reducing the duration causes the MSE removal algorithm to run, which
  1691.       // triggers an 'updateend' event to fire.  To handle this scenario, we
  1692.       // have to insert a dummy operation into the beginning of each queue,
  1693.       // which the 'updateend' handler will remove.
  1694.       if (duration < this.mediaSource_.duration) {
  1695.         for (const contentType in this.sourceBuffers_) {
  1696.           const dummyOperation = {
  1697.             start: () => {},
  1698.             p: new shaka.util.PublicPromise(),
  1699.             uri: null,
  1700.           };
  1701.           this.queues_[contentType].unshift(dummyOperation);
  1702.         }
  1703.       }
  1705.       this.mediaSource_.duration = duration;
  1706.       this.lastDuration_ = duration;
  1707.     });
  1708.   }
  1710.   /**
  1711.    * Get the current MediaSource duration.
  1712.    *
  1713.    * @return {number}
  1714.    */
  1715.   getDuration() {
  1716.     return this.mediaSource_.duration;
  1717.   }
  1719.   /**
  1720.    * Updates the live seekable range.
  1721.    *
  1722.    * @param {number} startTime
  1723.    * @param {number} endTime
  1724.    */
  1725.   async setLiveSeekableRange(startTime, endTime) {
  1726.     goog.asserts.assert('setLiveSeekableRange' in this.mediaSource_,
  1727.         'Using setLiveSeekableRange on not supported platform');
  1728.     if (this.ended() || this.closed()) {
  1729.       return;
  1730.     }
  1731.     await this.enqueueBlockingOperation_(() => {
  1732.       if (this.ended() || this.closed()) {
  1733.         return;
  1734.       }
  1735.       this.mediaSource_.setLiveSeekableRange(startTime, endTime);
  1736.     });
  1737.   }
  1739.   /**
  1740.    * Clear the current live seekable range.
  1741.    */
  1742.   async clearLiveSeekableRange() {
  1743.     goog.asserts.assert('clearLiveSeekableRange' in this.mediaSource_,
  1744.         'Using clearLiveSeekableRange on not supported platform');
  1745.     if (this.ended() || this.closed()) {
  1746.       return;
  1747.     }
  1748.     await this.enqueueBlockingOperation_(() => {
  1749.       if (this.ended() || this.closed()) {
  1750.         return;
  1751.       }
  1752.       this.mediaSource_.clearLiveSeekableRange();
  1753.     });
  1754.   }
  1756.   /**
  1757.    * Append data to the SourceBuffer.
  1758.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1759.    * @param {BufferSource} data
  1760.    * @param {number} timestampOffset
  1761.    * @private
  1762.    */
  1763.   append_(contentType, data, timestampOffset) {
  1764.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  1766.     // Append only video data to the LCEVC Dec.
  1767.     if (contentType == ContentType.VIDEO && this.lcevcDec_) {
  1768.       // Append video buffers to the LCEVC Dec for parsing and storing
  1769.       // of LCEVC data.
  1770.       this.lcevcDec_.appendBuffer(data, timestampOffset);
  1771.     }
  1773.     // This will trigger an 'updateend' event.
  1774.     this.sourceBuffers_[contentType].appendBuffer(data);
  1775.   }
  1777.   /**
  1778.    * Remove data from the SourceBuffer.
  1779.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1780.    * @param {number} startTime relative to the start of the presentation
  1781.    * @param {number} endTime relative to the start of the presentation
  1782.    * @private
  1783.    */
  1784.   remove_(contentType, startTime, endTime) {
  1785.     if (endTime <= startTime) {
  1786.       // Ignore removal of inverted or empty ranges.
  1787.       // Fake 'updateend' event to resolve the operation.
  1788.       this.onUpdateEnd_(contentType);
  1789.       return;
  1790.     }
  1792.     // This will trigger an 'updateend' event.
  1793.     this.sourceBuffers_[contentType].remove(startTime, endTime);
  1794.   }
  1796.   /**
  1797.    * Call abort() on the SourceBuffer.
  1798.    * This resets MSE's last_decode_timestamp on all track buffers, which should
  1799.    * trigger the splicing logic for overlapping segments.
  1800.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1801.    * @private
  1802.    */
  1803.   abort_(contentType) {
  1804.     // Save the append window, which is reset on abort().
  1805.     const appendWindowStart =
  1806.         this.sourceBuffers_[contentType].appendWindowStart;
  1807.     const appendWindowEnd = this.sourceBuffers_[contentType].appendWindowEnd;
  1809.     // This will not trigger an 'updateend' event, since nothing is happening.
  1810.     // This is only to reset MSE internals, not to abort an actual operation.
  1811.     this.sourceBuffers_[contentType].abort();
  1813.     // Restore the append window.
  1814.     this.sourceBuffers_[contentType].appendWindowStart = appendWindowStart;
  1815.     this.sourceBuffers_[contentType].appendWindowEnd = appendWindowEnd;
  1817.     // Fake an 'updateend' event to resolve the operation.
  1818.     this.onUpdateEnd_(contentType);
  1819.   }
  1821.   /**
  1822.    * Nudge the playhead to force the media pipeline to be flushed.
  1823.    * This seems to be necessary on Chromecast to get new content to replace old
  1824.    * content.
  1825.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1826.    * @private
  1827.    */
  1828.   flush_(contentType) {
  1829.     // Never use flush_ if there's data.  It causes a hiccup in playback.
  1830.     goog.asserts.assert(
  1831.         this.video_.buffered.length == 0, 'MediaSourceEngine.flush_ should ' +
  1832.         'only be used after clearing all data!');
  1834.     // Seeking forces the pipeline to be flushed.
  1835.     this.video_.currentTime -= 0.001;
  1837.     // Fake an 'updateend' event to resolve the operation.
  1838.     this.onUpdateEnd_(contentType);
  1839.   }
  1841.   /**
  1842.    * Set the SourceBuffer's timestamp offset.
  1843.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1844.    * @param {number} timestampOffset
  1845.    * @private
  1846.    */
  1847.   setTimestampOffset_(contentType, timestampOffset) {
  1848.     // Work around for
  1849.     // https://github.com/shaka-project/shaka-player/issues/1281:
  1850.     // TODO(https://bit.ly/2ttKiBU): follow up when this is fixed in Edge
  1851.     if (timestampOffset < 0) {
  1852.       // Try to prevent rounding errors in Edge from removing the first
  1853.       // keyframe.
  1854.       timestampOffset += 0.001;
  1855.     }
  1857.     this.sourceBuffers_[contentType].timestampOffset = timestampOffset;
  1859.     // Fake an 'updateend' event to resolve the operation.
  1860.     this.onUpdateEnd_(contentType);
  1861.   }
  1863.   /**
  1864.    * Set the SourceBuffer's append window end.
  1865.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1866.    * @param {number} appendWindowStart
  1867.    * @param {number} appendWindowEnd
  1868.    * @private
  1869.    */
  1870.   setAppendWindow_(contentType, appendWindowStart, appendWindowEnd) {
  1871.     // You can't set start > end, so first set start to 0, then set the new
  1872.     // end, then set the new start.  That way, there are no intermediate
  1873.     // states which are invalid.
  1874.     this.sourceBuffers_[contentType].appendWindowStart = 0;
  1875.     this.sourceBuffers_[contentType].appendWindowEnd = appendWindowEnd;
  1876.     this.sourceBuffers_[contentType].appendWindowStart = appendWindowStart;
  1878.     // Fake an 'updateend' event to resolve the operation.
  1879.     this.onUpdateEnd_(contentType);
  1880.   }
  1882.   /**
  1883.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1884.    * @private
  1885.    */
  1886.   onError_(contentType) {
  1887.     const operation = this.queues_[contentType][0];
  1888.     goog.asserts.assert(operation, 'Spurious error event!');
  1889.     goog.asserts.assert(!this.sourceBuffers_[contentType].updating,
  1890.         'SourceBuffer should not be updating on error!');
  1891.     const code = this.video_.error ? this.video_.error.code : 0;
  1892.     operation.p.reject(new shaka.util.Error(
  1893.         shaka.util.Error.Severity.CRITICAL,
  1894.         shaka.util.Error.Category.MEDIA,
  1895.         shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_FAILED,
  1896.         code, operation.uri));
  1897.     // Do not pop from queue.  An 'updateend' event will fire next, and to
  1898.     // avoid synchronizing these two event handlers, we will allow that one to
  1899.     // pop from the queue as normal.  Note that because the operation has
  1900.     // already been rejected, the call to resolve() in the 'updateend' handler
  1901.     // will have no effect.
  1902.   }
  1904.   /**
  1905.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1906.    * @private
  1907.    */
  1908.   onUpdateEnd_(contentType) {
  1909.     if (this.reloadingMediaSource_) {
  1910.       return;
  1911.     }
  1912.     const operation = this.queues_[contentType][0];
  1913.     goog.asserts.assert(operation, 'Spurious updateend event!');
  1914.     if (!operation) {
  1915.       return;
  1916.     }
  1917.     goog.asserts.assert(!this.sourceBuffers_[contentType].updating,
  1918.         'SourceBuffer should not be updating on updateend!');
  1919.     operation.p.resolve();
  1920.     this.popFromQueue_(contentType);
  1921.   }
  1923.   /**
  1924.    * Enqueue an operation and start it if appropriate.
  1925.    *
  1926.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  1927.    * @param {function()} start
  1928.    * @param {?string} uri
  1929.    * @return {!Promise}
  1930.    * @private
  1931.    */
  1932.   enqueueOperation_(contentType, start, uri) {
  1933.     this.destroyer_.ensureNotDestroyed();
  1934.     const operation = {
  1935.       start: start,
  1936.       p: new shaka.util.PublicPromise(),
  1937.       uri,
  1938.     };
  1939.     this.queues_[contentType].push(operation);
  1941.     if (this.queues_[contentType].length == 1) {
  1942.       this.startOperation_(contentType);
  1943.     }
  1944.     return operation.p;
  1945.   }
  1947.   /**
  1948.    * Enqueue an operation which must block all other operations on all
  1949.    * SourceBuffers.
  1950.    *
  1951.    * @param {function():(Promise|undefined)} run
  1952.    * @return {!Promise}
  1953.    * @private
  1954.    */
  1955.   async enqueueBlockingOperation_(run) {
  1956.     this.destroyer_.ensureNotDestroyed();
  1958.     /** @type {!Array<!shaka.util.PublicPromise>} */
  1959.     const allWaiters = [];
  1960.     /** @type {!Array<!shaka.util.ManifestParserUtils.ContentType>} */
  1961.     const contentTypes = Object.keys(this.sourceBuffers_);
  1963.     // Enqueue a 'wait' operation onto each queue.
  1964.     // This operation signals its readiness when it starts.
  1965.     // When all wait operations are ready, the real operation takes place.
  1966.     for (const contentType of contentTypes) {
  1967.       const ready = new shaka.util.PublicPromise();
  1968.       const operation = {
  1969.         start: () => ready.resolve(),
  1970.         p: ready,
  1971.         uri: null,
  1972.       };
  1974.       this.queues_[contentType].push(operation);
  1975.       allWaiters.push(ready);
  1977.       if (this.queues_[contentType].length == 1) {
  1978.         operation.start();
  1979.       }
  1980.     }
  1982.     // Return a Promise to the real operation, which waits to begin until
  1983.     // there are no other in-progress operations on any SourceBuffers.
  1984.     try {
  1985.       await Promise.all(allWaiters);
  1986.     } catch (error) {
  1987.       // One of the waiters failed, which means we've been destroyed.
  1988.       goog.asserts.assert(
  1989.           this.destroyer_.destroyed(), 'Should be destroyed by now');
  1990.       // We haven't popped from the queue.  Canceled waiters have been removed
  1991.       // by destroy.  What's left now should just be resolved waiters.  In
  1992.       // uncompiled mode, we will maintain good hygiene and make sure the
  1993.       // assert at the end of destroy passes.  In compiled mode, the queues
  1994.       // are wiped in destroy.
  1995.       if (goog.DEBUG) {
  1996.         for (const contentType of contentTypes) {
  1997.           if (this.queues_[contentType].length) {
  1998.             goog.asserts.assert(
  1999.                 this.queues_[contentType].length == 1,
  2000.                 'Should be at most one item in queue!');
  2001.             goog.asserts.assert(
  2002.                 allWaiters.includes(this.queues_[contentType][0].p),
  2003.                 'The item in queue should be one of our waiters!');
  2004.             this.queues_[contentType].shift();
  2005.           }
  2006.         }
  2007.       }
  2008.       throw error;
  2009.     }
  2011.     if (goog.DEBUG) {
  2012.       // If we did it correctly, nothing is updating.
  2013.       for (const contentType of contentTypes) {
  2014.         goog.asserts.assert(
  2015.             this.sourceBuffers_[contentType].updating == false,
  2016.             'SourceBuffers should not be updating after a blocking op!');
  2017.       }
  2018.     }
  2020.     // Run the real operation, which can be asynchronous.
  2021.     try {
  2022.       await run();
  2023.     } catch (exception) {
  2024.       throw new shaka.util.Error(
  2025.           shaka.util.Error.Severity.CRITICAL,
  2026.           shaka.util.Error.Category.MEDIA,
  2027.           shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_THREW,
  2028.           exception,
  2029.           this.video_.error || 'No error in the media element',
  2030.           null);
  2031.     } finally {
  2032.       // Unblock the queues.
  2033.       for (const contentType of contentTypes) {
  2034.         this.popFromQueue_(contentType);
  2035.       }
  2036.     }
  2037.   }
  2039.   /**
  2040.    * Pop from the front of the queue and start a new operation.
  2041.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2042.    * @private
  2043.    */
  2044.   popFromQueue_(contentType) {
  2045.     goog.asserts.assert(this.queues_[contentType], 'Queue should exist');
  2046.     // Remove the in-progress operation, which is now complete.
  2047.     this.queues_[contentType].shift();
  2048.     this.startOperation_(contentType);
  2049.   }
  2051.   /**
  2052.    * Starts the next operation in the queue.
  2053.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2054.    * @private
  2055.    */
  2056.   startOperation_(contentType) {
  2057.     // Retrieve the next operation, if any, from the queue and start it.
  2058.     const next = this.queues_[contentType][0];
  2059.     if (next) {
  2060.       try {
  2061.         next.start();
  2062.       } catch (exception) {
  2063.         if (exception.name == 'QuotaExceededError') {
  2064.           next.p.reject(new shaka.util.Error(
  2065.               shaka.util.Error.Severity.CRITICAL,
  2066.               shaka.util.Error.Category.MEDIA,
  2067.               shaka.util.Error.Code.QUOTA_EXCEEDED_ERROR,
  2068.               contentType));
  2069.         } else {
  2070.           next.p.reject(new shaka.util.Error(
  2071.               shaka.util.Error.Severity.CRITICAL,
  2072.               shaka.util.Error.Category.MEDIA,
  2073.               shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_THREW,
  2074.               exception,
  2075.               this.video_.error || 'No error in the media element',
  2076.               next.uri));
  2077.         }
  2078.         this.popFromQueue_(contentType);
  2079.       }
  2080.     }
  2081.   }
  2083.   /**
  2084.    * @return {!shaka.extern.TextDisplayer}
  2085.    */
  2086.   getTextDisplayer() {
  2087.     goog.asserts.assert(
  2088.         this.textDisplayer_,
  2089.         'TextDisplayer should only be null when this is destroyed');
  2091.     return this.textDisplayer_;
  2092.   }
  2094.   /**
  2095.    * @param {!shaka.extern.TextDisplayer} textDisplayer
  2096.    */
  2097.   setTextDisplayer(textDisplayer) {
  2098.     this.textDisplayer_ = textDisplayer;
  2099.     if (this.textEngine_) {
  2100.       this.textEngine_.setDisplayer(textDisplayer);
  2101.     }
  2102.   }
  2104.   /**
  2105.    * @param {boolean} segmentRelativeVttTiming
  2106.    */
  2107.   setSegmentRelativeVttTiming(segmentRelativeVttTiming) {
  2108.     this.segmentRelativeVttTiming_ = segmentRelativeVttTiming;
  2109.   }
  2111.   /**
  2112.    * Apply platform-specific transformations to this segment to work around
  2113.    * issues in the platform.
  2114.    *
  2115.    * @param {!BufferSource} segment
  2116.    * @param {?number} startTime
  2117.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2118.    * @param {?string} uri
  2119.    * @return {!BufferSource}
  2120.    * @private
  2121.    */
  2122.   workAroundBrokenPlatforms_(segment, startTime, contentType, uri) {
  2123.     const Platform = shaka.util.Platform;
  2125.     const isInitSegment = startTime == null;
  2126.     const encryptionExpected = this.expectedEncryption_[contentType];
  2127.     const keySystem = this.playerInterface_.getKeySystem();
  2129.     // If:
  2130.     //   1. the configuration tells to insert fake encryption,
  2131.     //   2. and this is an init segment,
  2132.     //   3. and encryption is expected,
  2133.     //   4. and the platform requires encryption in all init segments,
  2134.     //   5. and the content is MP4 (mimeType == "video/mp4" or "audio/mp4"),
  2135.     // then insert fake encryption metadata for init segments that lack it.
  2136.     // The MP4 requirement is because we can currently only do this
  2137.     // transformation on MP4 containers.
  2138.     // See: https://github.com/shaka-project/shaka-player/issues/2759
  2139.     if (this.config_.insertFakeEncryptionInInit &&
  2140.         isInitSegment &&
  2141.         encryptionExpected &&
  2142.         Platform.requiresEncryptionInfoInAllInitSegments(keySystem) &&
  2143.         shaka.util.MimeUtils.getContainerType(
  2144.             this.sourceBufferTypes_[contentType]) == 'mp4') {
  2145.       shaka.log.debug('Forcing fake encryption information in init segment.');
  2146.       segment = shaka.media.ContentWorkarounds.fakeEncryption(segment, uri);
  2147.     }
  2149.     if (isInitSegment &&
  2150.         Platform.requiresEC3InitSegments() &&
  2151.         shaka.util.MimeUtils.getContainerType(
  2152.             this.sourceBufferTypes_[contentType]) == 'mp4') {
  2153.       shaka.log.debug('Forcing fake EC-3 information in init segment.');
  2154.       segment = shaka.media.ContentWorkarounds.fakeEC3(segment);
  2155.     }
  2157.     return segment;
  2158.   }
  2160.   /**
  2161.    * Prepare the SourceBuffer to parse a potentially new type or codec.
  2162.    *
  2163.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2164.    * @param {string} mimeType
  2165.    * @param {?shaka.extern.Transmuxer} transmuxer
  2166.    * @private
  2167.    */
  2168.   change_(contentType, mimeType, transmuxer) {
  2169.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  2170.     if (contentType === ContentType.TEXT) {
  2171.       shaka.log.debug(`Change not supported for ${contentType}`);
  2172.       return;
  2173.     }
  2174.     shaka.log.debug(
  2175.         `Change Type: ${this.sourceBufferTypes_[contentType]} -> ${mimeType}`);
  2176.     if (shaka.media.Capabilities.isChangeTypeSupported()) {
  2177.       if (this.transmuxers_[contentType]) {
  2178.         this.transmuxers_[contentType].destroy();
  2179.         delete this.transmuxers_[contentType];
  2180.       }
  2181.       if (transmuxer) {
  2182.         this.transmuxers_[contentType] = transmuxer;
  2183.       }
  2184.       const type = this.addExtraFeaturesToMimeType_(mimeType);
  2185.       this.sourceBuffers_[contentType].changeType(type);
  2186.       this.sourceBufferTypes_[contentType] = mimeType;
  2187.     } else {
  2188.       shaka.log.debug('Change Type not supported');
  2189.     }
  2191.     // Fake an 'updateend' event to resolve the operation.
  2192.     this.onUpdateEnd_(contentType);
  2193.   }
  2195.   /**
  2196.    * Enqueue an operation to prepare the SourceBuffer to parse a potentially new
  2197.    * type or codec.
  2198.    *
  2199.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2200.    * @param {string} mimeType
  2201.    * @param {?shaka.extern.Transmuxer} transmuxer
  2202.    * @return {!Promise}
  2203.    */
  2204.   changeType(contentType, mimeType, transmuxer) {
  2205.     return this.enqueueOperation_(
  2206.         contentType,
  2207.         () => this.change_(contentType, mimeType, transmuxer),
  2208.         null);
  2209.   }
  2211.   /**
  2212.    * Resets the MediaSource and re-adds source buffers due to codec mismatch
  2213.    *
  2214.    * @param {!Map<shaka.util.ManifestParserUtils.ContentType,
  2215.    *               shaka.extern.Stream>} streamsByType
  2216.    * @private
  2217.    */
  2218.   async reset_(streamsByType) {
  2219.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  2220.     this.reloadingMediaSource_ = true;
  2221.     this.needSplitMuxedContent_ = false;
  2222.     const currentTime = this.video_.currentTime;
  2224.     // When codec switching if the user is currently paused we don't want
  2225.     // to trigger a play when switching codec.
  2226.     // Playing can also end up in a paused state after a codec switch
  2227.     // so we need to remember the current states.
  2228.     const previousAutoPlayState = this.video_.autoplay;
  2229.     const previousPausedState = this.video_.paused;
  2230.     if (this.playbackHasBegun_) {
  2231.       // Only set autoplay to false if the video playback has already begun.
  2232.       // When a codec switch happens before playback has begun this can cause
  2233.       // autoplay not to work as expected.
  2234.       this.video_.autoplay = false;
  2235.     }
  2237.     try {
  2238.       this.eventManager_.removeAll();
  2240.       for (const contentType in this.transmuxers_) {
  2241.         this.transmuxers_[contentType].destroy();
  2242.       }
  2243.       for (const contentType in this.sourceBuffers_) {
  2244.         const sourceBuffer = this.sourceBuffers_[contentType];
  2245.         try {
  2246.           this.mediaSource_.removeSourceBuffer(sourceBuffer);
  2247.         } catch (e) {
  2248.           shaka.log.debug('Exception on removeSourceBuffer', e);
  2249.         }
  2250.       }
  2251.       this.transmuxers_ = {};
  2252.       this.sourceBuffers_ = {};
  2254.       const previousDuration = this.mediaSource_.duration;
  2255.       this.mediaSourceOpen_ = new shaka.util.PublicPromise();
  2256.       this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
  2257.       await this.mediaSourceOpen_;
  2258.       if (!isNaN(previousDuration) && previousDuration) {
  2259.         this.mediaSource_.duration = previousDuration;
  2260.       } else if (!isNaN(this.lastDuration_) && this.lastDuration_) {
  2261.         this.mediaSource_.duration = this.lastDuration_;
  2262.       }
  2264.       const sourceBufferAdded = new shaka.util.PublicPromise();
  2265.       const sourceBuffers =
  2266.         /** @type {EventTarget} */(this.mediaSource_.sourceBuffers);
  2268.       const totalOfBuffers = streamsByType.size;
  2269.       let numberOfSourceBufferAdded = 0;
  2270.       const onSourceBufferAdded = () => {
  2271.         numberOfSourceBufferAdded++;
  2272.         if (numberOfSourceBufferAdded === totalOfBuffers) {
  2273.           sourceBufferAdded.resolve();
  2274.           this.eventManager_.unlisten(sourceBuffers, 'addsourcebuffer',
  2275.               onSourceBufferAdded);
  2276.         }
  2277.       };
  2279.       this.eventManager_.listen(sourceBuffers, 'addsourcebuffer',
  2280.           onSourceBufferAdded);
  2282.       for (const contentType of streamsByType.keys()) {
  2283.         const stream = streamsByType.get(contentType);
  2284.         // eslint-disable-next-line no-await-in-loop
  2285.         await this.initSourceBuffer_(contentType, stream, stream.codecs);
  2286.       }
  2287.       const audio = streamsByType.get(ContentType.AUDIO);
  2288.       if (audio && audio.isAudioMuxedInVideo) {
  2289.         this.needSplitMuxedContent_ = true;
  2290.       }
  2291.       if (this.needSplitMuxedContent_ && !this.queues_[ContentType.AUDIO]) {
  2292.         this.queues_[ContentType.AUDIO] = [];
  2293.       }
  2295.       // Fake a seek to catchup the playhead.
  2296.       this.video_.currentTime = currentTime;
  2298.       await sourceBufferAdded;
  2299.     } finally {
  2300.       this.reloadingMediaSource_ = false;
  2302.       this.destroyer_.ensureNotDestroyed();
  2304.       this.eventManager_.listenOnce(this.video_, 'canplaythrough', () => {
  2305.         // Don't use ensureNotDestroyed() from this event listener, because
  2306.         // that results in an uncaught exception.  Instead, just check the
  2307.         // flag.
  2308.         if (this.destroyer_.destroyed()) {
  2309.           return;
  2310.         }
  2312.         this.video_.autoplay = previousAutoPlayState;
  2313.         if (!previousPausedState) {
  2314.           this.video_.play();
  2315.         }
  2316.       });
  2317.     }
  2318.   }
  2320.   /**
  2321.    * Resets the Media Source
  2322.    * @param {!Map<shaka.util.ManifestParserUtils.ContentType,
  2323.    *               shaka.extern.Stream>} streamsByType
  2324.    * @return {!Promise}
  2325.    */
  2326.   reset(streamsByType) {
  2327.     return this.enqueueBlockingOperation_(
  2328.         () => this.reset_(streamsByType));
  2329.   }
  2331.   /**
  2332.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2333.    * @param {string} mimeType
  2334.    * @param {string} codecs
  2335.    * @return {{transmuxer: ?shaka.extern.Transmuxer,
  2336.    *          transmuxerMuxed: boolean, basicType: string, codec: string,
  2337.    *          mimeType: string}}
  2338.    * @private
  2339.    */
  2340.   getRealInfo_(contentType, mimeType, codecs) {
  2341.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  2342.     const MimeUtils = shaka.util.MimeUtils;
  2343.     /** @type {?shaka.extern.Transmuxer} */
  2344.     let transmuxer;
  2345.     let transmuxerMuxed = false;
  2346.     const audioCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
  2347.         ContentType.AUDIO, (codecs || '').split(','));
  2348.     const videoCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
  2349.         ContentType.VIDEO, (codecs || '').split(','));
  2350.     let codec = videoCodec;
  2351.     if (contentType == ContentType.AUDIO) {
  2352.       codec = audioCodec;
  2353.     }
  2354.     if (!codec) {
  2355.       codec = codecs;
  2356.     }
  2357.     let newMimeType = shaka.util.MimeUtils.getFullType(mimeType, codec);
  2358.     let needTransmux = this.config_.forceTransmux;
  2359.     if (!shaka.media.Capabilities.isTypeSupported(newMimeType) ||
  2360.         (!this.sequenceMode_ &&
  2361.         shaka.util.MimeUtils.RAW_FORMATS.includes(newMimeType))) {
  2362.       needTransmux = true;
  2363.     }
  2364.     const TransmuxerEngine = shaka.transmuxer.TransmuxerEngine;
  2365.     if (needTransmux) {
  2366.       const newMimeTypeWithAllCodecs =
  2367.           shaka.util.MimeUtils.getFullTypeWithAllCodecs(mimeType, codec);
  2368.       const transmuxerPlugin =
  2369.           TransmuxerEngine.findTransmuxer(newMimeTypeWithAllCodecs);
  2370.       if (transmuxerPlugin) {
  2371.         transmuxer = transmuxerPlugin();
  2372.         if (audioCodec && videoCodec) {
  2373.           transmuxerMuxed = true;
  2374.         }
  2375.         newMimeType =
  2376.             transmuxer.convertCodecs(contentType, newMimeTypeWithAllCodecs);
  2377.       }
  2378.     }
  2380.     const newCodec = MimeUtils.getNormalizedCodec(
  2381.         MimeUtils.getCodecs(newMimeType));
  2382.     const newBasicType = MimeUtils.getBasicType(newMimeType);
  2383.     return {
  2384.       transmuxer,
  2385.       transmuxerMuxed,
  2386.       basicType: newBasicType,
  2387.       codec: newCodec,
  2388.       mimeType: newMimeType,
  2389.     };
  2390.   }
  2392.   /**
  2393.    * Codec switch if necessary, this will not resolve until the codec
  2394.    * switch is over.
  2395.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2396.    * @param {string} mimeType
  2397.    * @param {string} codecs
  2398.    * @param {!Map<shaka.util.ManifestParserUtils.ContentType,
  2399.    *               shaka.extern.Stream>} streamsByType
  2400.    * @return {!Promise<boolean>} true if there was a codec switch,
  2401.    *                              false otherwise.
  2402.    * @private
  2403.    */
  2404.   async codecSwitchIfNecessary_(contentType, mimeType, codecs, streamsByType) {
  2405.     const ContentType = shaka.util.ManifestParserUtils.ContentType;
  2406.     if (contentType == ContentType.TEXT) {
  2407.       return false;
  2408.     }
  2409.     const MimeUtils = shaka.util.MimeUtils;
  2410.     const currentCodec = MimeUtils.getNormalizedCodec(
  2411.         MimeUtils.getCodecs(this.sourceBufferTypes_[contentType]));
  2412.     const currentBasicType = MimeUtils.getBasicType(
  2413.         this.sourceBufferTypes_[contentType]);
  2415.     const realInfo = this.getRealInfo_(contentType, mimeType, codecs);
  2416.     const transmuxer = realInfo.transmuxer;
  2417.     const transmuxerMuxed = realInfo.transmuxerMuxed;
  2418.     const newBasicType = realInfo.basicType;
  2419.     const newCodec = realInfo.codec;
  2420.     const newMimeType = realInfo.mimeType;
  2422.     let muxedContentCheck = true;
  2423.     if (transmuxerMuxed) {
  2424.       const muxedRealInfo =
  2425.           this.getRealInfo_(ContentType.AUDIO, mimeType, codecs);
  2426.       const muxedCurrentCodec = MimeUtils.getNormalizedCodec(
  2427.           MimeUtils.getCodecs(this.sourceBufferTypes_[ContentType.AUDIO]));
  2428.       const muxedCurrentBasicType = MimeUtils.getBasicType(
  2429.           this.sourceBufferTypes_[ContentType.AUDIO]);
  2430.       muxedContentCheck = muxedCurrentCodec == muxedRealInfo.codec &&
  2431.         muxedCurrentBasicType == muxedRealInfo.basicType;
  2432.       if (muxedRealInfo.transmuxer) {
  2433.         muxedRealInfo.transmuxer.destroy();
  2434.       }
  2435.     }
  2437.     // Current/new codecs base and basic type match then no need to switch
  2438.     if (currentCodec === newCodec && currentBasicType === newBasicType &&
  2439.         muxedContentCheck) {
  2440.       if (this.transmuxers_[contentType] && !transmuxer) {
  2441.         this.transmuxers_[contentType].destroy();
  2442.         delete this.transmuxers_[contentType];
  2443.       } else if (!this.transmuxers_[contentType] && transmuxer) {
  2444.         this.transmuxers_[contentType] = transmuxer;
  2445.       } else if (transmuxer) {
  2446.         // Compare if the transmuxer is different
  2447.         if (this.transmuxers_[contentType] &&
  2448.             this.transmuxers_[contentType].transmux != transmuxer.transmux) {
  2449.           this.transmuxers_[contentType].destroy();
  2450.           delete this.transmuxers_[contentType];
  2451.           this.transmuxers_[contentType] = transmuxer;
  2452.         } else {
  2453.           transmuxer.destroy();
  2454.         }
  2455.       }
  2456.       return false;
  2457.     }
  2459.     let allowChangeType = true;
  2460.     if (this.needSplitMuxedContent_ || (transmuxerMuxed &&
  2461.         transmuxer && !this.transmuxers_[contentType])) {
  2462.       allowChangeType = false;
  2463.     }
  2465.     if (allowChangeType && this.config_.codecSwitchingStrategy ===
  2466.         shaka.config.CodecSwitchingStrategy.SMOOTH &&
  2467.           shaka.media.Capabilities.isChangeTypeSupported()) {
  2468.       await this.changeType(contentType, newMimeType, transmuxer);
  2469.     } else {
  2470.       if (transmuxer) {
  2471.         transmuxer.destroy();
  2472.       }
  2473.       await this.reset(streamsByType);
  2474.     }
  2475.     return true;
  2476.   }
  2478.   /**
  2479.    * Returns true if it's necessary codec switch to load the new stream.
  2480.    *
  2481.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2482.    * @param {string} refMimeType
  2483.    * @param {string} refCodecs
  2484.    * @return {boolean}
  2485.    * @private
  2486.    */
  2487.   isCodecSwitchNecessary_(contentType, refMimeType, refCodecs) {
  2488.     if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
  2489.       return false;
  2490.     }
  2491.     const MimeUtils = shaka.util.MimeUtils;
  2492.     const currentCodec = MimeUtils.getNormalizedCodec(
  2493.         MimeUtils.getCodecs(this.sourceBufferTypes_[contentType]));
  2494.     const currentBasicType = MimeUtils.getBasicType(
  2495.         this.sourceBufferTypes_[contentType]);
  2497.     let newMimeType = shaka.util.MimeUtils.getFullType(refMimeType, refCodecs);
  2498.     let needTransmux = this.config_.forceTransmux;
  2499.     if (!shaka.media.Capabilities.isTypeSupported(newMimeType) ||
  2500.         (!this.sequenceMode_ &&
  2501.         shaka.util.MimeUtils.RAW_FORMATS.includes(newMimeType))) {
  2502.       needTransmux = true;
  2503.     }
  2504.     const newMimeTypeWithAllCodecs =
  2505.         shaka.util.MimeUtils.getFullTypeWithAllCodecs(
  2506.             refMimeType, refCodecs);
  2507.     const TransmuxerEngine = shaka.transmuxer.TransmuxerEngine;
  2508.     if (needTransmux) {
  2509.       const transmuxerPlugin =
  2510.           TransmuxerEngine.findTransmuxer(newMimeTypeWithAllCodecs);
  2511.       if (transmuxerPlugin) {
  2512.         const transmuxer = transmuxerPlugin();
  2513.         newMimeType =
  2514.             transmuxer.convertCodecs(contentType, newMimeTypeWithAllCodecs);
  2515.         transmuxer.destroy();
  2516.       }
  2517.     }
  2519.     const newCodec = MimeUtils.getNormalizedCodec(
  2520.         MimeUtils.getCodecs(newMimeType));
  2521.     const newBasicType = MimeUtils.getBasicType(newMimeType);
  2523.     return currentCodec !== newCodec || currentBasicType !== newBasicType;
  2524.   }
  2526.   /**
  2527.    * Returns true if it's necessary reset the media source to load the
  2528.    * new stream.
  2529.    *
  2530.    * @param {shaka.util.ManifestParserUtils.ContentType} contentType
  2531.    * @param {string} mimeType
  2532.    * @param {string} codecs
  2533.    * @return {boolean}
  2534.    */
  2535.   isResetMediaSourceNecessary(contentType, mimeType, codecs) {
  2536.     if (!this.isCodecSwitchNecessary_(contentType, mimeType, codecs)) {
  2537.       return false;
  2538.     }
  2540.     return this.config_.codecSwitchingStrategy !==
  2541.         shaka.config.CodecSwitchingStrategy.SMOOTH ||
  2542.         !shaka.media.Capabilities.isChangeTypeSupported() ||
  2543.         this.needSplitMuxedContent_;
  2544.   }
  2546.   /**
  2547.    * Update LCEVC Decoder object when ready for LCEVC Decode.
  2548.    * @param {?shaka.lcevc.Dec} lcevcDec
  2549.    */
  2550.   updateLcevcDec(lcevcDec) {
  2551.     this.lcevcDec_ = lcevcDec;
  2552.   }
  2554.   /**
  2555.    * @param {string} mimeType
  2556.    * @return {string}
  2557.    * @private
  2558.    */
  2559.   addExtraFeaturesToMimeType_(mimeType) {
  2560.     const extraFeatures = this.config_.addExtraFeaturesToSourceBuffer(mimeType);
  2561.     const extendedType = mimeType + extraFeatures;
  2562.     shaka.log.debug('Using full mime type', extendedType);
  2564.     return extendedType;
  2565.   }
  2566. };
  2569. /**
  2570.  * Internal reference to window.URL.createObjectURL function to avoid
  2571.  * compatibility issues with other libraries and frameworks such as React
  2572.  * Native. For use in unit tests only, not meant for external use.
  2573.  *
  2574.  * @type {function(?):string}
  2575.  */
  2576. shaka.media.MediaSourceEngine.createObjectURL = window.URL.createObjectURL;
  2579. /**
  2580.  * @typedef {{
  2581.  *   start: function(),
  2582.  *   p: !shaka.util.PublicPromise,
  2583.  *   uri: ?string
  2584.  * }}
  2585.  *
  2586.  * @summary An operation in queue.
  2587.  * @property {function()} start
  2588.  *   The function which starts the operation.
  2589.  * @property {!shaka.util.PublicPromise} p
  2590.  *   The PublicPromise which is associated with this operation.
  2591.  * @property {?string} uri
  2592.  *   A segment URI (if any) associated with this operation.
  2593.  */
  2594. shaka.media.MediaSourceEngine.Operation;
  2597. /**
  2598.  * @enum {string}
  2599.  * @private
  2600.  */
  2601. shaka.media.MediaSourceEngine.SourceBufferMode_ = {
  2602.   SEQUENCE: 'sequence',
  2603.   SEGMENTS: 'segments',
  2604. };
  2607. /**
  2608.  * @typedef {{
  2609.  *   getKeySystem: function():?string,
  2610.  *   onMetadata: function(!Array<shaka.extern.ID3Metadata>, number, ?number),
  2611.  *   onEvent: function(!Event),
  2612.  *   onManifestUpdate: function()
  2613.  * }}
  2614.  *
  2615.  * @summary Player interface
  2616.  * @property {function():?string} getKeySystem
  2617.  *   Gets currently used key system or null if not used.
  2618.  * @property {function(
  2619.  *     !Array<shaka.extern.ID3Metadata>, number, ?number)} onMetadata
  2620.  *   Callback to use when metadata arrives.
  2621.  * @property {function(!Event)} onEvent
  2622.  *   Called when an event occurs that should be sent to the app.
  2623.  * @property {function()} onManifestUpdate
  2624.  *   Called when an embedded 'emsg' box should trigger a manifest update.
  2625.  */
  2626. shaka.media.MediaSourceEngine.PlayerInterface;