mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-14 15:56:38 +03:00
Álvaro Velad Galván
1051 lines
35 KiB
JavaScript
1051 lines
35 KiB
JavaScript
/** @license
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.provide('shaka.media.MediaSourceEngine');
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goog.require('goog.asserts');
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goog.require('shaka.log');
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goog.require('shaka.media.IClosedCaptionParser');
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goog.require('shaka.media.TimeRangesUtils');
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goog.require('shaka.media.Transmuxer');
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goog.require('shaka.text.TextEngine');
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goog.require('shaka.util.Destroyer');
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goog.require('shaka.util.Error');
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goog.require('shaka.util.EventManager');
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goog.require('shaka.util.Functional');
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goog.require('shaka.util.IDestroyable');
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goog.require('shaka.util.ManifestParserUtils');
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goog.require('shaka.util.MimeUtils');
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goog.require('shaka.util.Platform');
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goog.require('shaka.util.PublicPromise');
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/**
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* @summary
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* MediaSourceEngine wraps all operations on MediaSource and SourceBuffers.
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* All asynchronous operations return a Promise, and all operations are
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* internally synchronized and serialized as needed. Operations that can
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* be done in parallel will be done in parallel.
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*
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* @implements {shaka.util.IDestroyable}
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*/
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shaka.media.MediaSourceEngine = class {
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/**
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* @param {HTMLMediaElement} video The video element, whose source is tied to
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* MediaSource during the lifetime of the MediaSourceEngine.
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* @param {!shaka.media.IClosedCaptionParser} closedCaptionParser
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* The closed caption parser that should be used to parser closed captions
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* from the video stream. MediaSourceEngine takes ownership of the parser.
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* When MediaSourceEngine is destroyed, it will destroy the parser.
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* @param {!shaka.extern.TextDisplayer} textDisplayer
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* The text displayer that will be used with the text engine.
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* MediaSourceEngine takes ownership of the displayer. When
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* MediaSourceEngine is destroyed, it will destroy the displayer.
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*/
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constructor(video, closedCaptionParser, textDisplayer) {
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/** @private {HTMLMediaElement} */
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this.video_ = video;
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/** @private {shaka.extern.TextDisplayer} */
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this.textDisplayer_ = textDisplayer;
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/** @private {!Object.<shaka.util.ManifestParserUtils.ContentType,
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SourceBuffer>} */
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this.sourceBuffers_ = {};
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/** @private {shaka.text.TextEngine} */
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this.textEngine_ = null;
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/**
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* @private {!Object.<string,
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* !Array.<shaka.media.MediaSourceEngine.Operation>>}
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*/
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this.queues_ = {};
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/** @private {shaka.util.EventManager} */
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this.eventManager_ = new shaka.util.EventManager();
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/** @private {!Object.<string, !shaka.media.Transmuxer>} */
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this.transmuxers_ = {};
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/** @private {shaka.media.IClosedCaptionParser} */
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this.captionParser_ = closedCaptionParser;
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/** @private {!shaka.util.PublicPromise} */
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this.mediaSourceOpen_ = new shaka.util.PublicPromise();
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/** @private {MediaSource} */
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this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
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/** @type {!shaka.util.Destroyer} */
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this.destroyer_ = new shaka.util.Destroyer(() => this.doDestroy_());
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}
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/**
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* Create a MediaSource object, attach it to the video element, and return it.
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* Resolves the given promise when the MediaSource is ready.
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*
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* Replaced by unit tests.
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*
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* @param {!shaka.util.PublicPromise} p
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* @return {!MediaSource}
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*/
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createMediaSource(p) {
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const mediaSource = new MediaSource();
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// Set up MediaSource on the video element.
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this.eventManager_.listenOnce(mediaSource, 'sourceopen', p.resolve);
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this.video_.src =
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shaka.media.MediaSourceEngine.createObjectURL(mediaSource);
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return mediaSource;
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}
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/**
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* Checks if a certain type is supported.
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*
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* @param {shaka.extern.Stream} stream
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* @return {boolean}
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*/
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static isStreamSupported(stream) {
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const fullMimeType = shaka.util.MimeUtils.getFullType(
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stream.mimeType, stream.codecs);
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const extendedMimeType = shaka.util.MimeUtils.getExtendedType(stream);
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return shaka.text.TextEngine.isTypeSupported(fullMimeType) ||
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MediaSource.isTypeSupported(extendedMimeType) ||
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shaka.media.Transmuxer.isSupported(fullMimeType, stream.type);
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}
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/**
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* Returns a map of MediaSource support for well-known types.
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*
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* @return {!Object.<string, boolean>}
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*/
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static probeSupport() {
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const testMimeTypes = [
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// MP4 types
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'video/mp4; codecs="avc1.42E01E"',
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'video/mp4; codecs="avc3.42E01E"',
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'video/mp4; codecs="hev1.1.6.L93.90"',
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'video/mp4; codecs="hvc1.1.6.L93.90"',
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'video/mp4; codecs="hev1.2.4.L153.B0"; eotf="smpte2084"', // HDR HEVC
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'video/mp4; codecs="hvc1.2.4.L153.B0"; eotf="smpte2084"', // HDR HEVC
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'video/mp4; codecs="vp9"',
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'video/mp4; codecs="vp09.00.10.08"',
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'video/mp4; codecs="av01.0.01M.08"',
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'audio/mp4; codecs="mp4a.40.2"',
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'audio/mp4; codecs="ac-3"',
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'audio/mp4; codecs="ec-3"',
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'audio/mp4; codecs="opus"',
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'audio/mp4; codecs="flac"',
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// WebM types
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'video/webm; codecs="vp8"',
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'video/webm; codecs="vp9"',
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'video/webm; codecs="vp09.00.10.08"',
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'audio/webm; codecs="vorbis"',
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'audio/webm; codecs="opus"',
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// MPEG2 TS types (video/ is also used for audio: https://bit.ly/TsMse)
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'video/mp2t; codecs="avc1.42E01E"',
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'video/mp2t; codecs="avc3.42E01E"',
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'video/mp2t; codecs="hvc1.1.6.L93.90"',
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'video/mp2t; codecs="mp4a.40.2"',
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'video/mp2t; codecs="ac-3"',
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'video/mp2t; codecs="ec-3"',
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// WebVTT types
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'text/vtt',
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'application/mp4; codecs="wvtt"',
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// TTML types
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'application/ttml+xml',
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'application/mp4; codecs="stpp"',
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];
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const support = {};
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for (const type of testMimeTypes) {
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if (shaka.util.Platform.supportsMediaSource()) {
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// Our TextEngine is only effective for MSE platforms at the moment.
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if (shaka.text.TextEngine.isTypeSupported(type)) {
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support[type] = true;
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} else {
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support[type] = MediaSource.isTypeSupported(type) ||
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shaka.media.Transmuxer.isSupported(type);
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}
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} else {
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support[type] = shaka.util.Platform.supportsMediaType(type);
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}
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const basicType = type.split(';')[0];
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support[basicType] = support[basicType] || support[type];
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}
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return support;
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}
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/** @override */
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destroy() {
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return this.destroyer_.destroy();
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}
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/** @private */
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async doDestroy_() {
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const Functional = shaka.util.Functional;
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const cleanup = [];
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for (const contentType in this.queues_) {
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// Make a local copy of the queue and the first item.
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const q = this.queues_[contentType];
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const inProgress = q[0];
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// Drop everything else out of the original queue.
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this.queues_[contentType] = q.slice(0, 1);
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// We will wait for this item to complete/fail.
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if (inProgress) {
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cleanup.push(inProgress.p.catch(Functional.noop));
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}
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// The rest will be rejected silently if possible.
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for (const item of q.slice(1)) {
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item.p.reject(shaka.util.Destroyer.destroyedError());
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}
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}
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if (this.textEngine_) {
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cleanup.push(this.textEngine_.destroy());
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}
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if (this.textDisplayer_) {
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cleanup.push(this.textDisplayer_.destroy());
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}
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for (const contentType in this.transmuxers_) {
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cleanup.push(this.transmuxers_[contentType].destroy());
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}
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await Promise.all(cleanup);
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if (this.eventManager_) {
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this.eventManager_.release();
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this.eventManager_ = null;
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}
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if (this.video_) {
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// "unload" the video element.
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this.video_.removeAttribute('src');
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this.video_.load();
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this.video_ = null;
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}
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this.mediaSource_ = null;
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this.textEngine_ = null;
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this.textDisplayer_ = null;
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this.sourceBuffers_ = {};
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this.transmuxers_ = {};
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this.captionParser_ = null;
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if (goog.DEBUG) {
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for (const contentType in this.queues_) {
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goog.asserts.assert(
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this.queues_[contentType].length == 0,
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contentType + ' queue should be empty after destroy!');
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}
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}
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this.queues_ = {};
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}
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/**
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* @return {!Promise} Resolved when MediaSource is open and attached to the
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* media element. This process is actually initiated by the constructor.
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*/
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open() {
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return this.mediaSourceOpen_;
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}
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/**
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* Initialize MediaSourceEngine.
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*
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* Note that it is not valid to call this multiple times, except to add or
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* reinitialize text streams.
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*
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* @param {!Map.<shaka.util.ManifestParserUtils.ContentType,
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* shaka.extern.Stream>} streamsByType
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* A map of content types to streams. All streams must be supported
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* according to MediaSourceEngine.isStreamSupported.
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* @param {boolean} forceTransmuxTS
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* If true, this will transmux TS content even if it is natively supported.
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*
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* @return {!Promise}
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*/
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async init(streamsByType, forceTransmuxTS) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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await this.mediaSourceOpen_;
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for (const contentType of streamsByType.keys()) {
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const stream = streamsByType.get(contentType);
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goog.asserts.assert(
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shaka.media.MediaSourceEngine.isStreamSupported(stream),
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'Type negotiation should happen before MediaSourceEngine.init!');
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let mimeType = shaka.util.MimeUtils.getFullType(
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stream.mimeType, stream.codecs);
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if (contentType == ContentType.TEXT) {
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this.reinitText(mimeType);
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} else {
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if ((forceTransmuxTS || !MediaSource.isTypeSupported(mimeType)) &&
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shaka.media.Transmuxer.isSupported(mimeType, contentType)) {
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this.transmuxers_[contentType] = new shaka.media.Transmuxer();
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mimeType =
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shaka.media.Transmuxer.convertTsCodecs(contentType, mimeType);
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}
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const sourceBuffer = this.mediaSource_.addSourceBuffer(mimeType);
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this.eventManager_.listen(
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sourceBuffer, 'error',
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() => this.onError_(contentType));
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this.eventManager_.listen(
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sourceBuffer, 'updateend',
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() => this.onUpdateEnd_(contentType));
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this.sourceBuffers_[contentType] = sourceBuffer;
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this.queues_[contentType] = [];
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}
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}
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}
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/**
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* Reinitialize the TextEngine for a new text type.
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* @param {string} mimeType
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*/
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reinitText(mimeType) {
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if (!this.textEngine_) {
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this.textEngine_ = new shaka.text.TextEngine(this.textDisplayer_);
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}
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this.textEngine_.initParser(mimeType);
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}
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/**
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* @return {boolean} True if the MediaSource is in an "ended" state, or if the
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* object has been destroyed.
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*/
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ended() {
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return this.mediaSource_ ? this.mediaSource_.readyState == 'ended' : true;
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}
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/**
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* Gets the first timestamp in buffer for the given content type.
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*
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* @param {shaka.util.ManifestParserUtils.ContentType} contentType
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* @return {?number} The timestamp in seconds, or null if nothing is buffered.
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*/
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bufferStart(contentType) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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if (contentType == ContentType.TEXT) {
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return this.textEngine_.bufferStart();
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}
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return shaka.media.TimeRangesUtils.bufferStart(
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this.getBuffered_(contentType));
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}
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/**
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* Gets the last timestamp in buffer for the given content type.
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*
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* @param {shaka.util.ManifestParserUtils.ContentType} contentType
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* @return {?number} The timestamp in seconds, or null if nothing is buffered.
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*/
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bufferEnd(contentType) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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if (contentType == ContentType.TEXT) {
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return this.textEngine_.bufferEnd();
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}
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return shaka.media.TimeRangesUtils.bufferEnd(
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this.getBuffered_(contentType));
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}
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/**
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* Determines if the given time is inside the buffered range of the given
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* content type.
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*
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* @param {shaka.util.ManifestParserUtils.ContentType} contentType
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* @param {number} time Playhead time
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* @param {number=} smallGapLimit
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* @return {boolean}
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*/
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isBuffered(contentType, time, smallGapLimit) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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if (contentType == ContentType.TEXT) {
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return this.textEngine_.isBuffered(time);
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} else {
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const buffered = this.getBuffered_(contentType);
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return shaka.media.TimeRangesUtils.isBuffered(
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buffered, time, smallGapLimit);
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}
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}
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/**
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* Computes how far ahead of the given timestamp is buffered for the given
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* content type.
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*
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* @param {shaka.util.ManifestParserUtils.ContentType} contentType
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* @param {number} time
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* @return {number} The amount of time buffered ahead in seconds.
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*/
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bufferedAheadOf(contentType, time) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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if (contentType == ContentType.TEXT) {
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return this.textEngine_.bufferedAheadOf(time);
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} else {
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const buffered = this.getBuffered_(contentType);
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return shaka.media.TimeRangesUtils.bufferedAheadOf(buffered, time);
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}
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}
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/**
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* Fill in the given buffered info object with the buffered info that media
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* source knows about.
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*
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* @param {shaka.extern.BufferedInfo} info
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*/
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getBufferedInfo(info) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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const getBufferedInfo = shaka.media.TimeRangesUtils.getBufferedInfo;
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info.total = getBufferedInfo(this.video_.buffered);
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info.audio = getBufferedInfo(this.getBuffered_(ContentType.AUDIO));
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info.video = getBufferedInfo(this.getBuffered_(ContentType.VIDEO));
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info.text = [];
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if (this.textEngine_) {
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const start = this.textEngine_.bufferStart();
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const end = this.textEngine_.bufferEnd();
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if (start != null && end != null) {
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info.text.push({start: start, end: end});
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}
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}
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}
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/**
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* @param {shaka.util.ManifestParserUtils.ContentType} contentType
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* @return {TimeRanges} The buffered ranges for the given content type, or
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* null if the buffered ranges could not be obtained.
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* @private
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*/
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getBuffered_(contentType) {
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try {
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return this.sourceBuffers_[contentType].buffered;
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} catch (exception) {
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if (contentType in this.sourceBuffers_) {
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// Note: previous MediaSource errors may cause access to |buffered| to
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// throw.
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shaka.log.error('failed to get buffered range for ' + contentType,
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exception);
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}
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return null;
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}
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}
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/**
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* Enqueue an operation to append data to the SourceBuffer.
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* Start and end times are needed for TextEngine, but not for MediaSource.
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* Start and end times may be null for initialization segments; if present
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* they are relative to the presentation timeline.
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*
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* @param {shaka.util.ManifestParserUtils.ContentType} contentType
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* @param {BufferSource} data
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* @param {?number} startTime relative to the start of the presentation
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* @param {?number} endTime relative to the start of the presentation
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* @param {?boolean} hasClosedCaptions True if the buffer contains CEA closed
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* captions
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* @return {!Promise}
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*/
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async appendBuffer(contentType, data, startTime, endTime, hasClosedCaptions) {
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const ContentType = shaka.util.ManifestParserUtils.ContentType;
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if (contentType == ContentType.TEXT) {
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await this.textEngine_.appendBuffer(data, startTime, endTime);
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} else if (this.transmuxers_[contentType]) {
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const transmuxedData =
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await this.transmuxers_[contentType].transmux(data);
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// For HLS CEA-608/708 CLOSED-CAPTIONS, text data is embedded in
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// the video stream, so textEngine may not have been initialized.
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if (!this.textEngine_) {
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this.reinitText('text/vtt');
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}
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// This doesn't work for native TS support (ex. Edge/Chromecast),
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// since no transmuxing is needed for native TS.
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if (transmuxedData.captions && transmuxedData.captions.length) {
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const videoOffset =
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this.sourceBuffers_[ContentType.VIDEO].timestampOffset;
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this.textEngine_.storeAndAppendClosedCaptions(
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transmuxedData.captions, startTime, endTime, videoOffset);
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}
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await this.enqueueOperation_(
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contentType, () => this.append_(contentType, transmuxedData.data));
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} else if (hasClosedCaptions && window.muxjs) {
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if (!this.textEngine_) {
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this.reinitText('text/vtt');
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}
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// If it is the init segment for closed captions, initialize the closed
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// caption parser.
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if (startTime == null && endTime == null) {
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this.captionParser_.init(data);
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} else {
|
|
this.captionParser_.parseFrom(data, (captions) => {
|
|
if (captions.length) {
|
|
const videoOffset =
|
|
this.sourceBuffers_[ContentType.VIDEO].timestampOffset;
|
|
this.textEngine_.storeAndAppendClosedCaptions(
|
|
captions, startTime, endTime, videoOffset);
|
|
}
|
|
});
|
|
}
|
|
await this.enqueueOperation_(
|
|
contentType,
|
|
() => this.append_(contentType, data));
|
|
} else {
|
|
await this.enqueueOperation_(
|
|
contentType,
|
|
() => this.append_(contentType, data));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set the selected closed captions Id and language.
|
|
*
|
|
* @param {string} id
|
|
*/
|
|
setSelectedClosedCaptionId(id) {
|
|
const VIDEO = shaka.util.ManifestParserUtils.ContentType.VIDEO;
|
|
const videoBufferEndTime = this.bufferEnd(VIDEO) || 0;
|
|
this.textEngine_.setSelectedClosedCaptionId(id, videoBufferEndTime);
|
|
}
|
|
|
|
/**
|
|
* Enqueue an operation to remove data from the SourceBuffer.
|
|
*
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {number} startTime relative to the start of the presentation
|
|
* @param {number} endTime relative to the start of the presentation
|
|
* @return {!Promise}
|
|
*/
|
|
async remove(contentType, startTime, endTime) {
|
|
// On IE11, this operation would be permitted, but would have no effect!
|
|
// See https://github.com/google/shaka-player/issues/251
|
|
goog.asserts.assert(endTime < Number.MAX_VALUE,
|
|
'remove() with MAX_VALUE or Infinity is not IE-compatible!');
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
if (contentType == ContentType.TEXT) {
|
|
await this.textEngine_.remove(startTime, endTime);
|
|
} else {
|
|
await this.enqueueOperation_(
|
|
contentType,
|
|
() => this.remove_(contentType, startTime, endTime));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Enqueue an operation to clear the SourceBuffer.
|
|
*
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @return {!Promise}
|
|
*/
|
|
async clear(contentType) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
if (contentType == ContentType.TEXT) {
|
|
if (!this.textEngine_) {
|
|
return;
|
|
}
|
|
|
|
// CaptionParser tracks the latest timestamp and uses this to filter
|
|
// for duplicate captions. We do this ourselves, so we must reset
|
|
// the CaptionParser when we seek. The best indicator of an
|
|
// unbuffered seek in MediaSourceEngine is clear(). This causes a
|
|
// small glitch when we change languages (which also calls clear()),
|
|
// where the first caption in the new language may be missing.
|
|
// TODO: Ask mux.js for a switch to remove this timestamp-tracking
|
|
// feature so that we can do away with these hacks.
|
|
this.captionParser_.reset();
|
|
|
|
await this.textEngine_.remove(0, Infinity);
|
|
} else {
|
|
// Note that not all platforms allow clearing to Infinity.
|
|
await this.enqueueOperation_(
|
|
contentType,
|
|
() => this.remove_(contentType, 0, this.mediaSource_.duration));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Enqueue an operation to flush the SourceBuffer.
|
|
* This is a workaround for what we believe is a Chromecast bug.
|
|
*
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @return {!Promise}
|
|
*/
|
|
async flush(contentType) {
|
|
// Flush the pipeline. Necessary on Chromecast, even though we have removed
|
|
// everything.
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
if (contentType == ContentType.TEXT) {
|
|
// Nothing to flush for text.
|
|
return;
|
|
}
|
|
await this.enqueueOperation_(
|
|
contentType,
|
|
() => this.flush_(contentType));
|
|
}
|
|
|
|
/**
|
|
* Sets the timestamp offset and append window end for the given content type.
|
|
*
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {number} timestampOffset The timestamp offset. Segments which start
|
|
* at time t will be inserted at time t + timestampOffset instead. This
|
|
* value does not affect segments which have already been inserted.
|
|
* @param {number} appendWindowStart The timestamp to set the append window
|
|
* start to. For future appends, frames/samples with timestamps less than
|
|
* this value will be dropped.
|
|
* @param {number} appendWindowEnd The timestamp to set the append window end
|
|
* to. For future appends, frames/samples with timestamps greater than this
|
|
* value will be dropped.
|
|
* @return {!Promise}
|
|
*/
|
|
async setStreamProperties(
|
|
contentType, timestampOffset, appendWindowStart, appendWindowEnd) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
if (contentType == ContentType.TEXT) {
|
|
this.textEngine_.setTimestampOffset(timestampOffset);
|
|
this.textEngine_.setAppendWindow(appendWindowStart, appendWindowEnd);
|
|
return;
|
|
}
|
|
|
|
await Promise.all([
|
|
// Queue an abort() to help MSE splice together overlapping segments.
|
|
// We set appendWindowEnd when we change periods in DASH content, and the
|
|
// period transition may result in overlap.
|
|
//
|
|
// An abort() also helps with MPEG2-TS. When we append a TS segment, we
|
|
// always enter a PARSING_MEDIA_SEGMENT state and we can't change the
|
|
// timestamp offset. By calling abort(), we reset the state so we can
|
|
// set it.
|
|
this.enqueueOperation_(
|
|
contentType,
|
|
() => this.abort_(contentType)),
|
|
this.enqueueOperation_(
|
|
contentType,
|
|
() => this.setTimestampOffset_(contentType, timestampOffset)),
|
|
this.enqueueOperation_(
|
|
contentType,
|
|
() => this.setAppendWindow_(
|
|
contentType, appendWindowStart, appendWindowEnd)),
|
|
]);
|
|
}
|
|
|
|
/**
|
|
* @param {string=} reason Valid reasons are 'network' and 'decode'.
|
|
* @return {!Promise}
|
|
* @see http://w3c.github.io/media-source/#idl-def-EndOfStreamError
|
|
*/
|
|
async endOfStream(reason) {
|
|
await this.enqueueBlockingOperation_(() => {
|
|
// If endOfStream() has already been called on the media source,
|
|
// don't call it again.
|
|
if (this.ended()) {
|
|
return;
|
|
}
|
|
// Tizen and IE11 won't let us pass undefined, but it will let us omit the
|
|
// argument.
|
|
if (reason) {
|
|
this.mediaSource_.endOfStream(reason);
|
|
} else {
|
|
this.mediaSource_.endOfStream();
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* We only support increasing duration at this time. Decreasing duration
|
|
* causes the MSE removal algorithm to run, which results in an 'updateend'
|
|
* event. Supporting this scenario would be complicated, and is not currently
|
|
* needed.
|
|
*
|
|
* @param {number} duration
|
|
* @return {!Promise}
|
|
*/
|
|
async setDuration(duration) {
|
|
goog.asserts.assert(
|
|
isNaN(this.mediaSource_.duration) ||
|
|
this.mediaSource_.duration <= duration,
|
|
'duration cannot decrease: ' + this.mediaSource_.duration + ' -> ' +
|
|
duration);
|
|
await this.enqueueBlockingOperation_(() => {
|
|
this.mediaSource_.duration = duration;
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Get the current MediaSource duration.
|
|
*
|
|
* @return {number}
|
|
*/
|
|
getDuration() {
|
|
return this.mediaSource_.duration;
|
|
}
|
|
|
|
/**
|
|
* Append data to the SourceBuffer.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {BufferSource} data
|
|
* @private
|
|
*/
|
|
append_(contentType, data) {
|
|
// This will trigger an 'updateend' event.
|
|
this.sourceBuffers_[contentType].appendBuffer(data);
|
|
}
|
|
|
|
/**
|
|
* Remove data from the SourceBuffer.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {number} startTime relative to the start of the presentation
|
|
* @param {number} endTime relative to the start of the presentation
|
|
* @private
|
|
*/
|
|
remove_(contentType, startTime, endTime) {
|
|
if (endTime <= startTime) {
|
|
// Ignore removal of inverted or empty ranges.
|
|
// Fake 'updateend' event to resolve the operation.
|
|
this.onUpdateEnd_(contentType);
|
|
return;
|
|
}
|
|
|
|
// This will trigger an 'updateend' event.
|
|
this.sourceBuffers_[contentType].remove(startTime, endTime);
|
|
}
|
|
|
|
/**
|
|
* Call abort() on the SourceBuffer.
|
|
* This resets MSE's last_decode_timestamp on all track buffers, which should
|
|
* trigger the splicing logic for overlapping segments.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @private
|
|
*/
|
|
abort_(contentType) {
|
|
// Save the append window, which is reset on abort().
|
|
const appendWindowStart =
|
|
this.sourceBuffers_[contentType].appendWindowStart;
|
|
const appendWindowEnd = this.sourceBuffers_[contentType].appendWindowEnd;
|
|
|
|
// This will not trigger an 'updateend' event, since nothing is happening.
|
|
// This is only to reset MSE internals, not to abort an actual operation.
|
|
this.sourceBuffers_[contentType].abort();
|
|
|
|
// Restore the append window.
|
|
this.sourceBuffers_[contentType].appendWindowStart = appendWindowStart;
|
|
this.sourceBuffers_[contentType].appendWindowEnd = appendWindowEnd;
|
|
|
|
// Fake an 'updateend' event to resolve the operation.
|
|
this.onUpdateEnd_(contentType);
|
|
}
|
|
|
|
/**
|
|
* Nudge the playhead to force the media pipeline to be flushed.
|
|
* This seems to be necessary on Chromecast to get new content to replace old
|
|
* content.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @private
|
|
*/
|
|
flush_(contentType) {
|
|
// Never use flush_ if there's data. It causes a hiccup in playback.
|
|
goog.asserts.assert(
|
|
this.video_.buffered.length == 0, 'MediaSourceEngine.flush_ should ' +
|
|
'only be used after clearing all data!');
|
|
|
|
// Seeking forces the pipeline to be flushed.
|
|
this.video_.currentTime -= 0.001;
|
|
|
|
// Fake an 'updateend' event to resolve the operation.
|
|
this.onUpdateEnd_(contentType);
|
|
}
|
|
|
|
/**
|
|
* Set the SourceBuffer's timestamp offset.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {number} timestampOffset
|
|
* @private
|
|
*/
|
|
setTimestampOffset_(contentType, timestampOffset) {
|
|
// Work around for https://github.com/google/shaka-player/issues/1281:
|
|
// TODO(https://bit.ly/2ttKiBU): follow up when this is fixed in Edge
|
|
if (timestampOffset < 0) {
|
|
// Try to prevent rounding errors in Edge from removing the first
|
|
// keyframe.
|
|
timestampOffset += 0.001;
|
|
}
|
|
|
|
this.sourceBuffers_[contentType].timestampOffset = timestampOffset;
|
|
|
|
// Fake an 'updateend' event to resolve the operation.
|
|
this.onUpdateEnd_(contentType);
|
|
}
|
|
|
|
/**
|
|
* Set the SourceBuffer's append window end.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {number} appendWindowStart
|
|
* @param {number} appendWindowEnd
|
|
* @private
|
|
*/
|
|
setAppendWindow_(contentType, appendWindowStart, appendWindowEnd) {
|
|
// You can't set start > end, so first set start to 0, then set the new
|
|
// end, then set the new start. That way, there are no intermediate
|
|
// states which are invalid.
|
|
this.sourceBuffers_[contentType].appendWindowStart = 0;
|
|
this.sourceBuffers_[contentType].appendWindowEnd = appendWindowEnd;
|
|
this.sourceBuffers_[contentType].appendWindowStart = appendWindowStart;
|
|
|
|
// Fake an 'updateend' event to resolve the operation.
|
|
this.onUpdateEnd_(contentType);
|
|
}
|
|
|
|
/**
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @private
|
|
*/
|
|
onError_(contentType) {
|
|
const operation = this.queues_[contentType][0];
|
|
goog.asserts.assert(operation, 'Spurious error event!');
|
|
goog.asserts.assert(!this.sourceBuffers_[contentType].updating,
|
|
'SourceBuffer should not be updating on error!');
|
|
const code = this.video_.error ? this.video_.error.code : 0;
|
|
operation.p.reject(new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MEDIA,
|
|
shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_FAILED,
|
|
code));
|
|
// Do not pop from queue. An 'updateend' event will fire next, and to
|
|
// avoid synchronizing these two event handlers, we will allow that one to
|
|
// pop from the queue as normal. Note that because the operation has
|
|
// already been rejected, the call to resolve() in the 'updateend' handler
|
|
// will have no effect.
|
|
}
|
|
|
|
/**
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @private
|
|
*/
|
|
onUpdateEnd_(contentType) {
|
|
const operation = this.queues_[contentType][0];
|
|
goog.asserts.assert(operation, 'Spurious updateend event!');
|
|
if (!operation) {
|
|
return;
|
|
}
|
|
goog.asserts.assert(!this.sourceBuffers_[contentType].updating,
|
|
'SourceBuffer should not be updating on updateend!');
|
|
operation.p.resolve();
|
|
this.popFromQueue_(contentType);
|
|
}
|
|
|
|
/**
|
|
* Enqueue an operation and start it if appropriate.
|
|
*
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @param {function()} start
|
|
* @return {!Promise}
|
|
* @private
|
|
*/
|
|
enqueueOperation_(contentType, start) {
|
|
this.destroyer_.ensureNotDestroyed();
|
|
|
|
const operation = {
|
|
start: start,
|
|
p: new shaka.util.PublicPromise(),
|
|
};
|
|
this.queues_[contentType].push(operation);
|
|
|
|
if (this.queues_[contentType].length == 1) {
|
|
this.startOperation_(contentType);
|
|
}
|
|
return operation.p;
|
|
}
|
|
|
|
/**
|
|
* Enqueue an operation which must block all other operations on all
|
|
* SourceBuffers.
|
|
*
|
|
* @param {function()} run
|
|
* @return {!Promise}
|
|
* @private
|
|
*/
|
|
async enqueueBlockingOperation_(run) {
|
|
this.destroyer_.ensureNotDestroyed();
|
|
|
|
/** @type {Array.<!shaka.util.PublicPromise>} */
|
|
const allWaiters = [];
|
|
|
|
// Enqueue a 'wait' operation onto each queue.
|
|
// This operation signals its readiness when it starts.
|
|
// When all wait operations are ready, the real operation takes place.
|
|
for (const contentType in this.sourceBuffers_) {
|
|
const ready = new shaka.util.PublicPromise();
|
|
const operation = {
|
|
start: () => ready.resolve(),
|
|
p: ready,
|
|
};
|
|
|
|
this.queues_[contentType].push(operation);
|
|
allWaiters.push(ready);
|
|
|
|
if (this.queues_[contentType].length == 1) {
|
|
operation.start();
|
|
}
|
|
}
|
|
|
|
// Return a Promise to the real operation, which waits to begin until
|
|
// there are no other in-progress operations on any SourceBuffers.
|
|
try {
|
|
await Promise.all(allWaiters);
|
|
} catch (error) {
|
|
// One of the waiters failed, which means we've been destroyed.
|
|
goog.asserts.assert(
|
|
this.destroyer_.destroyed(), 'Should be destroyed by now');
|
|
// We haven't popped from the queue. Canceled waiters have been removed
|
|
// by destroy. What's left now should just be resolved waiters. In
|
|
// uncompiled mode, we will maintain good hygiene and make sure the
|
|
// assert at the end of destroy passes. In compiled mode, the queues
|
|
// are wiped in destroy.
|
|
if (goog.DEBUG) {
|
|
for (const contentType in this.sourceBuffers_) {
|
|
if (this.queues_[contentType].length) {
|
|
goog.asserts.assert(
|
|
this.queues_[contentType].length == 1,
|
|
'Should be at most one item in queue!');
|
|
goog.asserts.assert(
|
|
allWaiters.includes(this.queues_[contentType][0].p),
|
|
'The item in queue should be one of our waiters!');
|
|
this.queues_[contentType].shift();
|
|
}
|
|
}
|
|
}
|
|
throw error;
|
|
}
|
|
|
|
if (goog.DEBUG) {
|
|
// If we did it correctly, nothing is updating.
|
|
for (const contentType in this.sourceBuffers_) {
|
|
goog.asserts.assert(
|
|
this.sourceBuffers_[contentType].updating == false,
|
|
'SourceBuffers should not be updating after a blocking op!');
|
|
}
|
|
}
|
|
|
|
// Run the real operation, which is synchronous.
|
|
try {
|
|
run();
|
|
} 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);
|
|
} finally {
|
|
// Unblock the queues.
|
|
for (const contentType in this.sourceBuffers_) {
|
|
this.popFromQueue_(contentType);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Pop from the front of the queue and start a new operation.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @private
|
|
*/
|
|
popFromQueue_(contentType) {
|
|
// Remove the in-progress operation, which is now complete.
|
|
this.queues_[contentType].shift();
|
|
this.startOperation_(contentType);
|
|
}
|
|
|
|
/**
|
|
* Starts the next operation in the queue.
|
|
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
|
|
* @private
|
|
*/
|
|
startOperation_(contentType) {
|
|
// Retrieve the next operation, if any, from the queue and start it.
|
|
const next = this.queues_[contentType][0];
|
|
if (next) {
|
|
try {
|
|
next.start();
|
|
} catch (exception) {
|
|
if (exception.name == 'QuotaExceededError') {
|
|
next.p.reject(new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MEDIA,
|
|
shaka.util.Error.Code.QUOTA_EXCEEDED_ERROR,
|
|
contentType));
|
|
} else {
|
|
next.p.reject(new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MEDIA,
|
|
shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_THREW,
|
|
exception));
|
|
}
|
|
this.popFromQueue_(contentType);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return {!shaka.extern.TextDisplayer}
|
|
*/
|
|
getTextDisplayer() {
|
|
goog.asserts.assert(
|
|
this.textDisplayer_,
|
|
'TextDisplayer should only be null when this is destroyed');
|
|
|
|
return this.textDisplayer_;
|
|
}
|
|
|
|
/**
|
|
* @param {!shaka.extern.TextDisplayer} textDisplayer
|
|
*/
|
|
setTextDisplayer(textDisplayer) {
|
|
const oldTextDisplayer = this.textDisplayer_;
|
|
this.textDisplayer_ = textDisplayer;
|
|
if (oldTextDisplayer) {
|
|
textDisplayer.setTextVisibility(oldTextDisplayer.isTextVisible());
|
|
oldTextDisplayer.destroy();
|
|
}
|
|
if (this.textEngine_) {
|
|
this.textEngine_.setDisplayer(textDisplayer);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Internal reference to window.URL.createObjectURL function to avoid
|
|
* compatibility issues with other libraries and frameworks such as React
|
|
* Native. For use in unit tests only, not meant for external use.
|
|
*
|
|
* @type {function(?):string}
|
|
*/
|
|
shaka.media.MediaSourceEngine.createObjectURL = window.URL.createObjectURL;
|
|
|
|
|
|
/**
|
|
* @typedef {{
|
|
* start: function(),
|
|
* p: !shaka.util.PublicPromise
|
|
* }}
|
|
*
|
|
* @summary An operation in queue.
|
|
* @property {function()} start
|
|
* The function which starts the operation.
|
|
* @property {!shaka.util.PublicPromise} p
|
|
* The PublicPromise which is associated with this operation.
|
|
*/
|
|
shaka.media.MediaSourceEngine.Operation;
|
|
|
|
|