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media_source_engine.js
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/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.media.MediaSourceEngine');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.config.CodecSwitchingStrategy');
goog.require('shaka.media.Capabilities');
goog.require('shaka.media.ContentWorkarounds');
goog.require('shaka.media.ClosedCaptionParser');
goog.require('shaka.media.IClosedCaptionParser');
goog.require('shaka.media.ManifestParser');
goog.require('shaka.media.SegmentReference');
goog.require('shaka.media.TimeRangesUtils');
goog.require('shaka.text.TextEngine');
goog.require('shaka.transmuxer.TransmuxerEngine');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.Destroyer');
goog.require('shaka.util.Dom');
goog.require('shaka.util.Error');
goog.require('shaka.util.EventManager');
goog.require('shaka.util.FakeEvent');
goog.require('shaka.util.Functional');
goog.require('shaka.util.IDestroyable');
goog.require('shaka.util.Id3Utils');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.Mp4BoxParsers');
goog.require('shaka.util.Mp4Parser');
goog.require('shaka.util.Platform');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.StreamUtils');
goog.require('shaka.util.TsParser');
goog.require('shaka.lcevc.Dec');
/**
* @summary
* MediaSourceEngine wraps all operations on MediaSource and SourceBuffers.
* All asynchronous operations return a Promise, and all operations are
* internally synchronized and serialized as needed. Operations that can
* be done in parallel will be done in parallel.
*
* @implements {shaka.util.IDestroyable}
*/
shaka.media.MediaSourceEngine = class {
/**
* @param {HTMLMediaElement} video The video element, whose source is tied to
* MediaSource during the lifetime of the MediaSourceEngine.
* @param {!shaka.extern.TextDisplayer} textDisplayer
* The text displayer that will be used with the text engine.
* MediaSourceEngine takes ownership of the displayer. When
* MediaSourceEngine is destroyed, it will destroy the displayer.
* @param {!shaka.media.MediaSourceEngine.PlayerInterface} playerInterface
* Interface for common player methods.
* @param {?shaka.lcevc.Dec} [lcevcDec] Optional - LCEVC Decoder Object
*/
constructor(video, textDisplayer, playerInterface, lcevcDec) {
/** @private {HTMLMediaElement} */
this.video_ = video;
/** @private {?shaka.media.MediaSourceEngine.PlayerInterface} */
this.playerInterface_ = playerInterface;
/** @private {?shaka.extern.MediaSourceConfiguration} */
this.config_ = null;
/** @private {shaka.extern.TextDisplayer} */
this.textDisplayer_ = textDisplayer;
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* SourceBuffer>}
*/
this.sourceBuffers_ = {};
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* string>}
*/
this.sourceBufferTypes_ = {};
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* boolean>}
*/
this.expectedEncryption_ = {};
/** @private {shaka.text.TextEngine} */
this.textEngine_ = null;
/** @private {boolean} */
this.segmentRelativeVttTiming_ = false;
/** @private {?shaka.lcevc.Dec} */
this.lcevcDec_ = lcevcDec || null;
/**
* @private {!Object<string,
* !Array<shaka.media.MediaSourceEngine.Operation>>}
*/
this.queues_ = {};
/** @private {shaka.util.EventManager} */
this.eventManager_ = new shaka.util.EventManager();
/** @private {!Object<string, !shaka.extern.Transmuxer>} */
this.transmuxers_ = {};
/** @private {?shaka.media.IClosedCaptionParser} */
this.captionParser_ = null;
/** @private {!shaka.util.PublicPromise} */
this.mediaSourceOpen_ = new shaka.util.PublicPromise();
/** @private {string} */
this.url_ = '';
/** @private {boolean} */
this.playbackHasBegun_ = false;
/** @private {boolean} */
this.streamingAllowed_ = true;
/** @private {boolean} */
this.usingRemotePlayback_ = false;
/** @private {HTMLSourceElement} */
this.source_ = null;
/**
* Fallback source element with direct media URI, used for casting
* purposes.
* @private {HTMLSourceElement}
*/
this.secondarySource_ = null;
/** @private {MediaSource} */
this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
/** @private {boolean} */
this.reloadingMediaSource_ = false;
/** @type {!shaka.util.Destroyer} */
this.destroyer_ = new shaka.util.Destroyer(() => this.doDestroy_());
/** @private {boolean} */
this.sequenceMode_ = false;
/** @private {string} */
this.manifestType_ = shaka.media.ManifestParser.UNKNOWN;
/** @private {boolean} */
this.ignoreManifestTimestampsInSegmentsMode_ = false;
/** @private {boolean} */
this.attemptTimestampOffsetCalculation_ = false;
/** @private {!shaka.util.PublicPromise<number>} */
this.textSequenceModeOffset_ = new shaka.util.PublicPromise();
/** @private {boolean} */
this.needSplitMuxedContent_ = false;
/** @private {?number} */
this.lastDuration_ = null;
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* !shaka.util.TsParser>}
*/
this.tsParsers_ = {};
/** @private {?number} */
this.firstVideoTimestamp_ = null;
/** @private {?number} */
this.firstVideoReferenceStartTime_ = null;
/** @private {?number} */
this.firstAudioTimestamp_ = null;
/** @private {?number} */
this.firstAudioReferenceStartTime_ = null;
/** @private {!shaka.util.PublicPromise<number>} */
this.audioCompensation_ = new shaka.util.PublicPromise();
if (this.video_.remote) {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
this.eventManager_.listen(this.video_.remote, 'connect', () => {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
});
this.eventManager_.listen(this.video_.remote, 'connecting', () => {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
});
this.eventManager_.listen(this.video_.remote, 'disconnect', () => {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
});
}
}
/**
* Create a MediaSource object, attach it to the video element, and return it.
* Resolves the given promise when the MediaSource is ready.
*
* Replaced by unit tests.
*
* @param {!shaka.util.PublicPromise} p
* @return {!MediaSource}
*/
createMediaSource(p) {
this.streamingAllowed_ = true;
/** @type {!MediaSource} */
let mediaSource;
if (window.ManagedMediaSource) {
if (!this.secondarySource_) {
this.video_.disableRemotePlayback = true;
}
mediaSource = new ManagedMediaSource();
this.eventManager_.listen(
mediaSource, 'startstreaming', () => {
shaka.log.info('MMS startstreaming');
this.streamingAllowed_ = true;
});
this.eventManager_.listen(
mediaSource, 'endstreaming', () => {
shaka.log.info('MMS endstreaming');
this.streamingAllowed_ = false;
});
} else {
mediaSource = new MediaSource();
}
// Set up MediaSource on the video element.
this.eventManager_.listenOnce(
mediaSource, 'sourceopen', () => this.onSourceOpen_(p));
// Correctly set when playback has begun.
this.eventManager_.listenOnce(this.video_, 'playing', () => {
this.playbackHasBegun_ = true;
});
// Store the object URL for releasing it later.
this.url_ = shaka.media.MediaSourceEngine.createObjectURL(mediaSource);
this.video_.removeAttribute('src');
if (this.source_) {
this.video_.removeChild(this.source_);
}
if (this.secondarySource_) {
this.video_.removeChild(this.secondarySource_);
}
this.source_ = shaka.util.Dom.createSourceElement(this.url_);
this.video_.appendChild(this.source_);
if (this.secondarySource_) {
this.video_.appendChild(this.secondarySource_);
}
this.video_.load();
return mediaSource;
}
/**
* @param {string} uri
* @param {string} mimeType
*/
addSecondarySource(uri, mimeType) {
if (!this.video_ || !window.ManagedMediaSource || !this.mediaSource_) {
shaka.log.warning(
'Secondary source is used only with ManagedMediaSource');
return;
}
if (this.secondarySource_) {
this.video_.removeChild(this.secondarySource_);
}
this.secondarySource_ = shaka.util.Dom.createSourceElement(uri, mimeType);
this.video_.appendChild(this.secondarySource_);
this.video_.disableRemotePlayback = false;
}
/**
* @param {shaka.util.PublicPromise} p
* @private
*/
onSourceOpen_(p) {
goog.asserts.assert(this.url_, 'Must have object URL');
// Release the object URL that was previously created, to prevent memory
// leak.
// createObjectURL creates a strong reference to the MediaSource object
// inside the browser. Setting the src of the video then creates another
// reference within the video element. revokeObjectURL will remove the
// strong reference to the MediaSource object, and allow it to be
// garbage-collected later.
URL.revokeObjectURL(this.url_);
p.resolve();
}
/**
* Checks if a certain type is supported.
*
* @param {shaka.extern.Stream} stream
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {!Promise<boolean>}
*/
static async isStreamSupported(stream, contentType) {
if (stream.createSegmentIndex) {
await stream.createSegmentIndex();
}
if (!stream.segmentIndex) {
return false;
}
if (stream.segmentIndex.isEmpty()) {
return true;
}
const MimeUtils = shaka.util.MimeUtils;
const TransmuxerEngine = shaka.transmuxer.TransmuxerEngine;
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const StreamUtils = shaka.util.StreamUtils;
const seenCombos = new Set();
// Check each combination of mimeType and codecs within the segment index.
// Unfortunately we cannot use fullMimeTypes, as we ALSO need to check the
// getFullTypeWithAllCodecs (for the sake of the transmuxer) and we have no
// way of going from a full mimeType to a full mimeType with all codecs.
// As this function is only called in debug mode, a little inefficiency is
// acceptable.
for (const ref of stream.segmentIndex) {
const mimeType = ref.mimeType || stream.mimeType || '';
let codecs = ref.codecs || stream.codecs || '';
// Optimization for the case where the codecs and mimetype of the stream
// match the reference.
if (mimeType == stream.mimeType && codecs == stream.codecs) {
continue;
}
// Don't check the same combination of mimetype + codecs twice.
const combo = mimeType + ':' + codecs;
if (seenCombos.has(combo)) {
continue;
}
seenCombos.add(combo);
if (contentType == ContentType.TEXT) {
const fullMimeType = MimeUtils.getFullType(mimeType, codecs);
if (!shaka.text.TextEngine.isTypeSupported(fullMimeType)) {
return false;
}
} else {
if (contentType == ContentType.VIDEO) {
codecs = StreamUtils.getCorrectVideoCodecs(codecs);
} else if (contentType == ContentType.AUDIO) {
codecs = StreamUtils.getCorrectAudioCodecs(codecs, mimeType);
}
const extendedMimeType = MimeUtils.getExtendedType(
stream, mimeType, codecs);
const fullMimeType = MimeUtils.getFullTypeWithAllCodecs(
mimeType, codecs);
if (!shaka.media.Capabilities.isTypeSupported(extendedMimeType) &&
!TransmuxerEngine.isSupported(fullMimeType, stream.type)) {
return false;
}
}
}
return true;
}
/**
* Returns a map of MediaSource support for well-known types.
*
* @return {!Object<string, boolean>}
*/
static probeSupport() {
const testMimeTypes = [
// MP4 types
'video/mp4; codecs="avc1.42E01E"',
'video/mp4; codecs="avc3.42E01E"',
'video/mp4; codecs="hev1.1.6.L93.90"',
'video/mp4; codecs="hvc1.1.6.L93.90"',
'video/mp4; codecs="hev1.2.4.L153.B0"; eotf="smpte2084"', // HDR HEVC
'video/mp4; codecs="hvc1.2.4.L153.B0"; eotf="smpte2084"', // HDR HEVC
'video/mp4; codecs="vp9"',
'video/mp4; codecs="vp09.00.10.08"',
'video/mp4; codecs="av01.0.01M.08"',
'video/mp4; codecs="dvh1.05.01"',
'video/mp4; codecs="dvh1.20.01"',
'audio/mp4; codecs="mp4a.40.2"',
'audio/mp4; codecs="ac-3"',
'audio/mp4; codecs="ec-3"',
'audio/mp4; codecs="ac-4.02.01.01"',
'audio/mp4; codecs="opus"',
'audio/mp4; codecs="flac"',
'audio/mp4; codecs="dtsc"', // DTS Digital Surround
'audio/mp4; codecs="dtse"', // DTS Express
'audio/mp4; codecs="dtsx"', // DTS:X
// WebM types
'video/webm; codecs="vp8"',
'video/webm; codecs="vp9"',
'video/webm; codecs="vp09.00.10.08"',
'audio/webm; codecs="vorbis"',
'audio/webm; codecs="opus"',
// MPEG2 TS types (video/ is also used for audio: https://bit.ly/TsMse)
'video/mp2t; codecs="avc1.42E01E"',
'video/mp2t; codecs="avc3.42E01E"',
'video/mp2t; codecs="hvc1.1.6.L93.90"',
'video/mp2t; codecs="mp4a.40.2"',
'video/mp2t; codecs="ac-3"',
'video/mp2t; codecs="ec-3"',
// WebVTT types
'text/vtt',
'application/mp4; codecs="wvtt"',
// TTML types
'application/ttml+xml',
'application/mp4; codecs="stpp"',
// Containerless types
...shaka.util.MimeUtils.RAW_FORMATS,
];
const support = {};
for (const type of testMimeTypes) {
if (shaka.text.TextEngine.isTypeSupported(type)) {
support[type] = true;
} else if (shaka.util.Platform.supportsMediaSource()) {
support[type] = shaka.media.Capabilities.isTypeSupported(type) ||
shaka.transmuxer.TransmuxerEngine.isSupported(type);
} else {
support[type] = shaka.util.Platform.supportsMediaType(type);
}
const basicType = type.split(';')[0];
support[basicType] = support[basicType] || support[type];
}
return support;
}
/** @override */
destroy() {
return this.destroyer_.destroy();
}
/** @private */
async doDestroy_() {
const Functional = shaka.util.Functional;
const cleanup = [];
for (const contentType in this.queues_) {
// Make a local copy of the queue and the first item.
const q = this.queues_[contentType];
const inProgress = q[0];
// Drop everything else out of the original queue.
this.queues_[contentType] = q.slice(0, 1);
// We will wait for this item to complete/fail.
if (inProgress) {
cleanup.push(inProgress.p.catch(Functional.noop));
}
// The rest will be rejected silently if possible.
for (const item of q.slice(1)) {
item.p.reject(shaka.util.Destroyer.destroyedError());
}
}
if (this.textEngine_) {
cleanup.push(this.textEngine_.destroy());
}
await Promise.all(cleanup);
for (const contentType in this.transmuxers_) {
this.transmuxers_[contentType].destroy();
}
if (this.eventManager_) {
this.eventManager_.release();
this.eventManager_ = null;
}
if (this.video_ && this.secondarySource_) {
this.video_.removeChild(this.secondarySource_);
}
if (this.video_ && this.source_) {
// "unload" the video element.
this.video_.removeChild(this.source_);
this.video_.load();
this.video_.disableRemotePlayback = false;
}
this.video_ = null;
this.source_ = null;
this.secondarySource_ = null;
this.config_ = null;
this.mediaSource_ = null;
this.textEngine_ = null;
this.textDisplayer_ = null;
this.sourceBuffers_ = {};
this.transmuxers_ = {};
this.captionParser_ = null;
if (goog.DEBUG) {
for (const contentType in this.queues_) {
goog.asserts.assert(
this.queues_[contentType].length == 0,
contentType + ' queue should be empty after destroy!');
}
}
this.queues_ = {};
// This object is owned by Player
this.lcevcDec_ = null;
this.tsParsers_ = {};
this.playerInterface_ = null;
}
/**
* @return {!Promise} Resolved when MediaSource is open and attached to the
* media element. This process is actually initiated by the constructor.
*/
open() {
return this.mediaSourceOpen_;
}
/**
* Initialize MediaSourceEngine.
*
* Note that it is not valid to call this multiple times, except to add or
* reinitialize text streams.
*
* @param {!Map<shaka.util.ManifestParserUtils.ContentType,
* shaka.extern.Stream>} streamsByType
* A map of content types to streams. All streams must be supported
* according to MediaSourceEngine.isStreamSupported.
* @param {boolean=} sequenceMode
* If true, the media segments are appended to the SourceBuffer in strict
* sequence.
* @param {string=} manifestType
* Indicates the type of the manifest.
* @param {boolean=} ignoreManifestTimestampsInSegmentsMode
* If true, don't adjust the timestamp offset to account for manifest
* segment durations being out of sync with segment durations. In other
* words, assume that there are no gaps in the segments when appending
* to the SourceBuffer, even if the manifest and segment times disagree.
* Indicates if the manifest has text streams.
*
* @return {!Promise}
*/
async init(streamsByType, sequenceMode=false,
manifestType=shaka.media.ManifestParser.UNKNOWN,
ignoreManifestTimestampsInSegmentsMode=false) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
await this.mediaSourceOpen_;
if (this.ended() || this.closed()) {
shaka.log.alwaysError('Expected MediaSource to be open during init(); ' +
'reopening the media source.');
this.mediaSourceOpen_ = new shaka.util.PublicPromise();
this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
await this.mediaSourceOpen_;
}
this.sequenceMode_ = sequenceMode;
this.manifestType_ = manifestType;
this.ignoreManifestTimestampsInSegmentsMode_ =
ignoreManifestTimestampsInSegmentsMode;
this.attemptTimestampOffsetCalculation_ = !this.sequenceMode_ &&
this.manifestType_ == shaka.media.ManifestParser.HLS &&
!this.ignoreManifestTimestampsInSegmentsMode_;
this.tsParsers_ = {};
this.firstVideoTimestamp_ = null;
this.firstVideoReferenceStartTime_ = null;
this.firstAudioTimestamp_ = null;
this.firstAudioReferenceStartTime_ = null;
this.audioCompensation_ = new shaka.util.PublicPromise();
for (const contentType of streamsByType.keys()) {
const stream = streamsByType.get(contentType);
// eslint-disable-next-line no-await-in-loop
await this.initSourceBuffer_(contentType, stream, stream.codecs);
if (this.needSplitMuxedContent_) {
this.queues_[ContentType.AUDIO] = [];
this.queues_[ContentType.VIDEO] = [];
} else {
this.queues_[contentType] = [];
}
}
const audio = streamsByType.get(ContentType.AUDIO);
if (audio && audio.isAudioMuxedInVideo) {
this.needSplitMuxedContent_ = true;
}
}
/**
* Initialize a specific SourceBuffer.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {shaka.extern.Stream} stream
* @param {string} codecs
* @return {!Promise}
* @private
*/
async initSourceBuffer_(contentType, stream, codecs) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
goog.asserts.assert(
await shaka.media.MediaSourceEngine.isStreamSupported(
stream, contentType),
'Type negotiation should happen before MediaSourceEngine.init!');
let mimeType = shaka.util.MimeUtils.getFullType(
stream.mimeType, codecs);
if (contentType == ContentType.TEXT) {
this.reinitText(mimeType, this.sequenceMode_, stream.external);
} else {
let needTransmux = this.config_.forceTransmux;
if (!shaka.media.Capabilities.isTypeSupported(mimeType) ||
(!this.sequenceMode_ &&
shaka.util.MimeUtils.RAW_FORMATS.includes(mimeType))) {
needTransmux = true;
}
const mimeTypeWithAllCodecs =
shaka.util.MimeUtils.getFullTypeWithAllCodecs(
stream.mimeType, codecs);
if (needTransmux) {
const audioCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
ContentType.AUDIO, (codecs || '').split(','));
const videoCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
ContentType.VIDEO, (codecs || '').split(','));
if (audioCodec && videoCodec) {
this.needSplitMuxedContent_ = true;
await this.initSourceBuffer_(ContentType.AUDIO, stream, audioCodec);
await this.initSourceBuffer_(ContentType.VIDEO, stream, videoCodec);
return;
}
const transmuxerPlugin = shaka.transmuxer.TransmuxerEngine
.findTransmuxer(mimeTypeWithAllCodecs);
if (transmuxerPlugin) {
const transmuxer = transmuxerPlugin();
this.transmuxers_[contentType] = transmuxer;
mimeType =
transmuxer.convertCodecs(contentType, mimeTypeWithAllCodecs);
}
}
const type = this.addExtraFeaturesToMimeType_(mimeType);
this.destroyer_.ensureNotDestroyed();
let sourceBuffer;
try {
sourceBuffer = this.mediaSource_.addSourceBuffer(type);
} catch (exception) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MEDIA,
shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_THREW,
exception,
'The mediaSource_ status was ' + this.mediaSource_.readyState +
' expected \'open\'',
null);
}
if (this.sequenceMode_) {
sourceBuffer.mode =
shaka.media.MediaSourceEngine.SourceBufferMode_.SEQUENCE;
}
this.eventManager_.listen(
sourceBuffer, 'error',
() => this.onError_(contentType));
this.eventManager_.listen(
sourceBuffer, 'updateend',
() => this.onUpdateEnd_(contentType));
this.sourceBuffers_[contentType] = sourceBuffer;
this.sourceBufferTypes_[contentType] = mimeType;
this.expectedEncryption_[contentType] = !!stream.drmInfos.length;
}
}
/**
* Called by the Player to provide an updated configuration any time it
* changes. Must be called at least once before init().
*
* @param {shaka.extern.MediaSourceConfiguration} config
*/
configure(config) {
this.config_ = config;
if (this.textEngine_) {
this.textEngine_.setModifyCueCallback(config.modifyCueCallback);
}
}
/**
* Indicate if the streaming is allowed by MediaSourceEngine.
* If we using MediaSource we always returns true.
*
* @return {boolean}
*/
isStreamingAllowed() {
return this.streamingAllowed_ && !this.usingRemotePlayback_ &&
!this.reloadingMediaSource_;
}
/**
* Reinitialize the TextEngine for a new text type.
* @param {string} mimeType
* @param {boolean} sequenceMode
* @param {boolean} external
*/
reinitText(mimeType, sequenceMode, external) {
if (!this.textEngine_) {
this.textEngine_ = new shaka.text.TextEngine(this.textDisplayer_);
if (this.textEngine_) {
this.textEngine_.setModifyCueCallback(this.config_.modifyCueCallback);
}
}
this.textEngine_.initParser(mimeType, sequenceMode,
external || this.segmentRelativeVttTiming_, this.manifestType_);
}
/**
* @return {boolean} True if the MediaSource is in an "ended" state, or if the
* object has been destroyed.
*/
ended() {
if (this.reloadingMediaSource_) {
return false;
}
return this.mediaSource_ ? this.mediaSource_.readyState == 'ended' : true;
}
/**
* @return {boolean} True if the MediaSource is in an "closed" state, or if
* the object has been destroyed.
*/
closed() {
if (this.reloadingMediaSource_) {
return false;
}
return this.mediaSource_ ? this.mediaSource_.readyState == 'closed' : true;
}
/**
* Gets the first timestamp in buffer for the given content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {?number} The timestamp in seconds, or null if nothing is buffered.
*/
bufferStart(contentType) {
if (!Object.keys(this.sourceBuffers_).length) {
return null;
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.bufferStart();
}
return shaka.media.TimeRangesUtils.bufferStart(
this.getBuffered_(contentType));
}
/**
* Gets the last timestamp in buffer for the given content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {?number} The timestamp in seconds, or null if nothing is buffered.
*/
bufferEnd(contentType) {
if (!Object.keys(this.sourceBuffers_).length) {
return null;
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.bufferEnd();
}
return shaka.media.TimeRangesUtils.bufferEnd(
this.getBuffered_(contentType));
}
/**
* Determines if the given time is inside the buffered range of the given
* content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {number} time Playhead time
* @return {boolean}
*/
isBuffered(contentType, time) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.isBuffered(time);
} else {
const buffered = this.getBuffered_(contentType);
return shaka.media.TimeRangesUtils.isBuffered(buffered, time);
}
}
/**
* Computes how far ahead of the given timestamp is buffered for the given
* content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {number} time
* @return {number} The amount of time buffered ahead in seconds.
*/
bufferedAheadOf(contentType, time) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.bufferedAheadOf(time);
} else {
const buffered = this.getBuffered_(contentType);
return shaka.media.TimeRangesUtils.bufferedAheadOf(buffered, time);
}
}
/**
* Returns info about what is currently buffered.
* @return {shaka.extern.BufferedInfo}
*/
getBufferedInfo() {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const TimeRangesUtils = shaka.media.TimeRangesUtils;
const info = {
total: this.reloadingMediaSource_ ? [] :
TimeRangesUtils.getBufferedInfo(this.video_.buffered),
audio:
TimeRangesUtils.getBufferedInfo(this.getBuffered_(ContentType.AUDIO)),
video:
TimeRangesUtils.getBufferedInfo(this.getBuffered_(ContentType.VIDEO)),
text: [],
};
if (this.textEngine_) {
const start = this.textEngine_.bufferStart();
const end = this.textEngine_.bufferEnd();
if (start != null && end != null) {
info.text.push({start: start, end: end});
}
}
return info;
}
/**
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {TimeRanges} The buffered ranges for the given content type, or
* null if the buffered ranges could not be obtained.
* @private
*/
getBuffered_(contentType) {
if (this.reloadingMediaSource_ || this.usingRemotePlayback_) {
return null;
}
try {
return this.sourceBuffers_[contentType].buffered;
} catch (exception) {
if (contentType in this.sourceBuffers_) {
// Note: previous MediaSource errors may cause access to |buffered| to
// throw.
shaka.log.error('failed to get buffered range for ' + contentType,
exception);
}
return null;
}
}
/**
* Create a new closed caption parser. This will ONLY be replaced by tests as
* a way to inject fake closed caption parser instances.
*
* @param {string} mimeType
* @return {!shaka.media.IClosedCaptionParser}
*/
getCaptionParser(mimeType) {
return new shaka.media.ClosedCaptionParser(mimeType);
}
/**
* This method is only public for testing.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {!BufferSource} data
* @param {!shaka.media.SegmentReference} reference The segment reference
* we are appending
* @param {shaka.extern.Stream} stream
* @param {!string} mimeType
* @return {{timestamp: ?number, metadata: !Array<shaka.extern.ID3Metadata>}}
*/
getTimestampAndDispatchMetadata(contentType, data, reference, stream,
mimeType) {
let timestamp = null;
let metadata = [];
const uint8ArrayData = shaka.util.BufferUtils.toUint8(data);
if (shaka.util.MimeUtils.RAW_FORMATS.includes(mimeType)) {
const frames = shaka.util.Id3Utils.getID3Frames(uint8ArrayData);
if (frames.length && reference) {
const metadataTimestamp = frames.find((frame) => {
return frame.description ===
'com.apple.streaming.transportStreamTimestamp';
});
if (metadataTimestamp) {
timestamp = Math.round(metadataTimestamp.data) / 1000;
}
/** @private {shaka.extern.ID3Metadata} */
const id3Metadata = {
cueTime: reference.startTime,
data: uint8ArrayData,
frames: frames,
dts: reference.startTime,
pts: reference.startTime,
};
this.playerInterface_.onMetadata(
[id3Metadata], /* offset= */ 0, reference.endTime);
}
} else if (mimeType.includes('/mp4') &&
reference &&
reference.initSegmentReference &&
reference.initSegmentReference.timescale) {
const timescale = reference.initSegmentReference.timescale;
if (!isNaN(timescale)) {
const hasEmsg = ((stream.emsgSchemeIdUris != null &&
stream.emsgSchemeIdUris.length > 0) ||
this.config_.dispatchAllEmsgBoxes);
const Mp4Parser = shaka.util.Mp4Parser;
let startTime = 0;
let parsedMedia = false;
const parser = new Mp4Parser();
if (hasEmsg) {
parser.fullBox('emsg', (box) =>
this.parseEMSG_(reference, stream.emsgSchemeIdUris, box));
}
parser.fullBox('prft', (box) => this.parsePrft_(timescale, box))
.box('moof', Mp4Parser.children)
.box('traf', Mp4Parser.children)
.fullBox('tfdt', (box) => {
if (!parsedMedia) {
goog.asserts.assert(
box.version == 0 || box.version == 1,
'TFDT version can only be 0 or 1');
const parsed = shaka.util.Mp4BoxParsers.parseTFDTInaccurate(
box.reader, box.version);
startTime = parsed.baseMediaDecodeTime / timescale;
parsedMedia = true;
if (!hasEmsg) {
box.parser.stop();
}
}
}).parse(data, /* partialOkay= */ true);
if (parsedMedia && reference.timestampOffset == 0) {
timestamp = startTime;
}
}
} else if (!mimeType.includes('/mp4') && !mimeType.includes('/webm') &&
shaka.util.TsParser.probe(uint8ArrayData)) {
if (!this.tsParsers_[contentType]) {
this.tsParsers_[contentType] = new shaka.util.TsParser();
} else {
this.tsParsers_[contentType].clearData();
}
const tsParser = this.tsParsers_[contentType].parse(uint8ArrayData);
const startTime = tsParser.getStartTime(contentType);
if (startTime != null) {
timestamp = startTime;
}
metadata = tsParser.getMetadata();
}
return {timestamp, metadata};
}
/**
* Parse the EMSG box from a MP4 container.
*
* @param {!shaka.media.SegmentReference} reference
* @param {?Array<string>} emsgSchemeIdUris Array of emsg
* scheme_id_uri for which emsg boxes should be parsed.
* @param {!shaka.extern.ParsedBox} box
* @private
* https://dashif-documents.azurewebsites.net/Events/master/event.html#emsg-format
* aligned(8) class DASHEventMessageBox
* extends FullBox(‘emsg’, version, flags = 0){
* if (version==0) {
* string scheme_id_uri;
* string value;