1944 lines
63 KiB
JavaScript
1944 lines
63 KiB
JavaScript
/**
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* @file master-playlist-controller.js
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*/
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import window from 'global/window';
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import PlaylistLoader from './playlist-loader';
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import DashPlaylistLoader from './dash-playlist-loader';
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import { isEnabled, isLowestEnabledRendition } from './playlist.js';
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import SegmentLoader from './segment-loader';
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import SourceUpdater from './source-updater';
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import VTTSegmentLoader from './vtt-segment-loader';
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import * as Ranges from './ranges';
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import videojs from 'video.js';
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import { updateAdCues } from './ad-cue-tags';
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import SyncController from './sync-controller';
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import TimelineChangeController from './timeline-change-controller';
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import Decrypter from 'worker!./decrypter-worker.js';
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import Config from './config';
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import {
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parseCodecs,
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browserSupportsCodec,
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muxerSupportsCodec,
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DEFAULT_AUDIO_CODEC,
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DEFAULT_VIDEO_CODEC
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} from '@videojs/vhs-utils/es/codecs.js';
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import { codecsForPlaylist, unwrapCodecList, codecCount } from './util/codecs.js';
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import { createMediaTypes, setupMediaGroups } from './media-groups';
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import logger from './util/logger';
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const ABORT_EARLY_BLACKLIST_SECONDS = 60 * 2;
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let Vhs;
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// SegmentLoader stats that need to have each loader's
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// values summed to calculate the final value
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const loaderStats = [
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'mediaRequests',
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'mediaRequestsAborted',
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'mediaRequestsTimedout',
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'mediaRequestsErrored',
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'mediaTransferDuration',
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'mediaBytesTransferred',
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'mediaAppends'
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];
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const sumLoaderStat = function(stat) {
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return this.audioSegmentLoader_[stat] +
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this.mainSegmentLoader_[stat];
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};
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const shouldSwitchToMedia = function({
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currentPlaylist,
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nextPlaylist,
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forwardBuffer,
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bufferLowWaterLine,
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bufferHighWaterLine,
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duration,
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experimentalBufferBasedABR,
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log
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}) {
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// we have no other playlist to switch to
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if (!nextPlaylist) {
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videojs.log.warn('We received no playlist to switch to. Please check your stream.');
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return false;
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}
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const sharedLogLine = `allowing switch ${currentPlaylist && currentPlaylist.id || 'null'} -> ${nextPlaylist.id}`;
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// If the playlist is live, then we want to not take low water line into account.
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// This is because in LIVE, the player plays 3 segments from the end of the
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// playlist, and if `BUFFER_LOW_WATER_LINE` is greater than the duration availble
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// in those segments, a viewer will never experience a rendition upswitch.
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if (!currentPlaylist || !currentPlaylist.endList) {
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log(`${sharedLogLine} as current playlist ` + (!currentPlaylist ? 'is not set' : 'is live'));
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return true;
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}
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// no need to switch playlist is the same
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if (nextPlaylist.id === currentPlaylist.id) {
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return false;
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}
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const maxBufferLowWaterLine = experimentalBufferBasedABR ?
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Config.EXPERIMENTAL_MAX_BUFFER_LOW_WATER_LINE : Config.MAX_BUFFER_LOW_WATER_LINE;
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// For the same reason as LIVE, we ignore the low water line when the VOD
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// duration is below the max potential low water line
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if (duration < maxBufferLowWaterLine) {
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log(`${sharedLogLine} as duration < max low water line (${duration} < ${maxBufferLowWaterLine})`);
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return true;
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}
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const nextBandwidth = nextPlaylist.attributes.BANDWIDTH;
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const currBandwidth = currentPlaylist.attributes.BANDWIDTH;
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// when switching down, if our buffer is lower than the high water line,
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// we can switch down
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if (nextBandwidth < currBandwidth && (!experimentalBufferBasedABR || forwardBuffer < bufferHighWaterLine)) {
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let logLine = `${sharedLogLine} as next bandwidth < current bandwidth (${nextBandwidth} < ${currBandwidth})`;
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if (experimentalBufferBasedABR) {
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logLine += ` and forwardBuffer < bufferHighWaterLine (${forwardBuffer} < ${bufferHighWaterLine})`;
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}
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log(logLine);
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return true;
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}
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// and if our buffer is higher than the low water line,
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// we can switch up
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if ((!experimentalBufferBasedABR || nextBandwidth > currBandwidth) && forwardBuffer >= bufferLowWaterLine) {
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let logLine = `${sharedLogLine} as forwardBuffer >= bufferLowWaterLine (${forwardBuffer} >= ${bufferLowWaterLine})`;
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if (experimentalBufferBasedABR) {
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logLine += ` and next bandwidth > current bandwidth (${nextBandwidth} > ${currBandwidth})`;
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}
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log(logLine);
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return true;
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}
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log(`not ${sharedLogLine} as no switching criteria met`);
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return false;
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};
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/**
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* the master playlist controller controller all interactons
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* between playlists and segmentloaders. At this time this mainly
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* involves a master playlist and a series of audio playlists
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* if they are available
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*
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* @class MasterPlaylistController
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* @extends videojs.EventTarget
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*/
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export class MasterPlaylistController extends videojs.EventTarget {
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constructor(options) {
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super();
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const {
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src,
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handleManifestRedirects,
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withCredentials,
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tech,
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bandwidth,
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externVhs,
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useCueTags,
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blacklistDuration,
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enableLowInitialPlaylist,
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sourceType,
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cacheEncryptionKeys,
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experimentalBufferBasedABR
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} = options;
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if (!src) {
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throw new Error('A non-empty playlist URL or JSON manifest string is required');
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}
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let { maxPlaylistRetries } = options;
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if (maxPlaylistRetries === null || typeof maxPlaylistRetries === 'undefined') {
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maxPlaylistRetries = Infinity;
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}
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Vhs = externVhs;
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this.experimentalBufferBasedABR = Boolean(experimentalBufferBasedABR);
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this.withCredentials = withCredentials;
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this.tech_ = tech;
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this.vhs_ = tech.vhs;
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this.sourceType_ = sourceType;
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this.useCueTags_ = useCueTags;
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this.blacklistDuration = blacklistDuration;
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this.maxPlaylistRetries = maxPlaylistRetries;
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this.enableLowInitialPlaylist = enableLowInitialPlaylist;
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if (this.useCueTags_) {
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this.cueTagsTrack_ = this.tech_.addTextTrack(
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'metadata',
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'ad-cues'
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);
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this.cueTagsTrack_.inBandMetadataTrackDispatchType = '';
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}
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this.requestOptions_ = {
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withCredentials,
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handleManifestRedirects,
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maxPlaylistRetries,
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timeout: null
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};
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this.on('error', this.pauseLoading);
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this.mediaTypes_ = createMediaTypes();
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this.mediaSource = new window.MediaSource();
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this.handleDurationChange_ = this.handleDurationChange_.bind(this);
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this.handleSourceOpen_ = this.handleSourceOpen_.bind(this);
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this.handleSourceEnded_ = this.handleSourceEnded_.bind(this);
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this.mediaSource.addEventListener('durationchange', this.handleDurationChange_);
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// load the media source into the player
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this.mediaSource.addEventListener('sourceopen', this.handleSourceOpen_);
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this.mediaSource.addEventListener('sourceended', this.handleSourceEnded_);
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// we don't have to handle sourceclose since dispose will handle termination of
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// everything, and the MediaSource should not be detached without a proper disposal
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this.seekable_ = videojs.createTimeRanges();
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this.hasPlayed_ = false;
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this.syncController_ = new SyncController(options);
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this.segmentMetadataTrack_ = tech.addRemoteTextTrack({
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kind: 'metadata',
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label: 'segment-metadata'
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}, false).track;
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this.decrypter_ = new Decrypter();
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this.sourceUpdater_ = new SourceUpdater(this.mediaSource);
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this.inbandTextTracks_ = {};
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this.timelineChangeController_ = new TimelineChangeController();
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const segmentLoaderSettings = {
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vhs: this.vhs_,
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parse708captions: options.parse708captions,
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mediaSource: this.mediaSource,
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currentTime: this.tech_.currentTime.bind(this.tech_),
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seekable: () => this.seekable(),
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seeking: () => this.tech_.seeking(),
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duration: () => this.duration(),
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hasPlayed: () => this.hasPlayed_,
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goalBufferLength: () => this.goalBufferLength(),
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bandwidth,
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syncController: this.syncController_,
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decrypter: this.decrypter_,
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sourceType: this.sourceType_,
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inbandTextTracks: this.inbandTextTracks_,
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cacheEncryptionKeys,
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sourceUpdater: this.sourceUpdater_,
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timelineChangeController: this.timelineChangeController_
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};
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// The source type check not only determines whether a special DASH playlist loader
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// should be used, but also covers the case where the provided src is a vhs-json
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// manifest object (instead of a URL). In the case of vhs-json, the default
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// PlaylistLoader should be used.
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this.masterPlaylistLoader_ = this.sourceType_ === 'dash' ?
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new DashPlaylistLoader(src, this.vhs_, this.requestOptions_) :
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new PlaylistLoader(src, this.vhs_, this.requestOptions_);
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this.setupMasterPlaylistLoaderListeners_();
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// setup segment loaders
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// combined audio/video or just video when alternate audio track is selected
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this.mainSegmentLoader_ =
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new SegmentLoader(videojs.mergeOptions(segmentLoaderSettings, {
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segmentMetadataTrack: this.segmentMetadataTrack_,
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loaderType: 'main'
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}), options);
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// alternate audio track
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this.audioSegmentLoader_ =
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new SegmentLoader(videojs.mergeOptions(segmentLoaderSettings, {
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loaderType: 'audio'
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}), options);
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this.subtitleSegmentLoader_ =
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new VTTSegmentLoader(videojs.mergeOptions(segmentLoaderSettings, {
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loaderType: 'vtt',
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featuresNativeTextTracks: this.tech_.featuresNativeTextTracks
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}), options);
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this.setupSegmentLoaderListeners_();
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if (this.experimentalBufferBasedABR) {
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this.masterPlaylistLoader_.one('loadedplaylist', () => this.startABRTimer_());
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this.tech_.on('pause', () => this.stopABRTimer_());
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this.tech_.on('play', () => this.startABRTimer_());
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}
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// Create SegmentLoader stat-getters
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// mediaRequests_
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// mediaRequestsAborted_
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// mediaRequestsTimedout_
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// mediaRequestsErrored_
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// mediaTransferDuration_
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// mediaBytesTransferred_
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// mediaAppends_
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loaderStats.forEach((stat) => {
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this[stat + '_'] = sumLoaderStat.bind(this, stat);
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});
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this.logger_ = logger('MPC');
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this.triggeredFmp4Usage = false;
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if (this.tech_.preload() === 'none') {
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this.loadOnPlay_ = () => {
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this.loadOnPlay_ = null;
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this.masterPlaylistLoader_.load();
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};
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this.tech_.one('play', this.loadOnPlay_);
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} else {
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this.masterPlaylistLoader_.load();
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}
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this.timeToLoadedData__ = -1;
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this.mainAppendsToLoadedData__ = -1;
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this.audioAppendsToLoadedData__ = -1;
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const event = this.tech_.preload() === 'none' ? 'play' : 'loadstart';
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// start the first frame timer on loadstart or play (for preload none)
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this.tech_.one(event, () => {
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const timeToLoadedDataStart = Date.now();
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this.tech_.one('loadeddata', () => {
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this.timeToLoadedData__ = Date.now() - timeToLoadedDataStart;
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this.mainAppendsToLoadedData__ = this.mainSegmentLoader_.mediaAppends;
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this.audioAppendsToLoadedData__ = this.audioSegmentLoader_.mediaAppends;
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});
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});
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}
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mainAppendsToLoadedData_() {
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return this.mainAppendsToLoadedData__;
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}
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audioAppendsToLoadedData_() {
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return this.audioAppendsToLoadedData__;
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}
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appendsToLoadedData_() {
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const main = this.mainAppendsToLoadedData_();
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const audio = this.audioAppendsToLoadedData_();
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if (main === -1 || audio === -1) {
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return -1;
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}
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return main + audio;
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}
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timeToLoadedData_() {
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return this.timeToLoadedData__;
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}
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/**
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* Run selectPlaylist and switch to the new playlist if we should
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*
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* @private
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*
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*/
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checkABR_() {
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const nextPlaylist = this.selectPlaylist();
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if (this.shouldSwitchToMedia_(nextPlaylist)) {
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this.switchMedia_(nextPlaylist, 'abr');
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}
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}
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switchMedia_(playlist, cause, delay) {
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const oldMedia = this.media();
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const oldId = oldMedia && (oldMedia.id || oldMedia.uri);
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const newId = playlist.id || playlist.uri;
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if (oldId && oldId !== newId) {
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this.logger_(`switch media ${oldId} -> ${newId} from ${cause}`);
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this.tech_.trigger({type: 'usage', name: `vhs-rendition-change-${cause}`});
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}
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this.masterPlaylistLoader_.media(playlist, delay);
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}
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/**
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* Start a timer that periodically calls checkABR_
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*
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* @private
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*/
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startABRTimer_() {
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this.stopABRTimer_();
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this.abrTimer_ = window.setInterval(() => this.checkABR_(), 250);
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}
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/**
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* Stop the timer that periodically calls checkABR_
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*
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* @private
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*/
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stopABRTimer_() {
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// if we're scrubbing, we don't need to pause.
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// This getter will be added to Video.js in version 7.11.
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if (this.tech_.scrubbing && this.tech_.scrubbing()) {
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return;
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}
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window.clearInterval(this.abrTimer_);
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this.abrTimer_ = null;
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}
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/**
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* Get a list of playlists for the currently selected audio playlist
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*
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* @return {Array} the array of audio playlists
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*/
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getAudioTrackPlaylists_() {
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const master = this.master();
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// if we don't have any audio groups then we can only
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// assume that the audio tracks are contained in masters
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// playlist array, use that or an empty array.
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if (!master || !master.mediaGroups || !master.mediaGroups.AUDIO) {
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return master && master.playlists || [];
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}
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const AUDIO = master.mediaGroups.AUDIO;
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const groupKeys = Object.keys(AUDIO);
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let track;
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// get the current active track
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if (Object.keys(this.mediaTypes_.AUDIO.groups).length) {
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track = this.mediaTypes_.AUDIO.activeTrack();
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// or get the default track from master if mediaTypes_ isn't setup yet
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} else {
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// default group is `main` or just the first group.
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const defaultGroup = AUDIO.main || groupKeys.length && AUDIO[groupKeys[0]];
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for (const label in defaultGroup) {
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if (defaultGroup[label].default) {
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track = {label};
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break;
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}
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}
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}
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// no active track no playlists.
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if (!track) {
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return [];
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}
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const playlists = [];
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// get all of the playlists that are possible for the
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// active track.
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for (const group in AUDIO) {
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if (AUDIO[group][track.label]) {
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const properties = AUDIO[group][track.label];
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if (properties.playlists) {
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playlists.push.apply(playlists, properties.playlists);
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} else {
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playlists.push(properties);
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}
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}
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}
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return playlists;
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}
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/**
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* Register event handlers on the master playlist loader. A helper
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* function for construction time.
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*
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* @private
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*/
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setupMasterPlaylistLoaderListeners_() {
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this.masterPlaylistLoader_.on('loadedmetadata', () => {
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const media = this.masterPlaylistLoader_.media();
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const requestTimeout = (media.targetDuration * 1.5) * 1000;
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// If we don't have any more available playlists, we don't want to
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// timeout the request.
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if (isLowestEnabledRendition(this.masterPlaylistLoader_.master, this.masterPlaylistLoader_.media())) {
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this.requestOptions_.timeout = 0;
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} else {
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this.requestOptions_.timeout = requestTimeout;
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}
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// if this isn't a live video and preload permits, start
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// downloading segments
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if (media.endList && this.tech_.preload() !== 'none') {
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this.mainSegmentLoader_.playlist(media, this.requestOptions_);
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this.mainSegmentLoader_.load();
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}
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setupMediaGroups({
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sourceType: this.sourceType_,
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segmentLoaders: {
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AUDIO: this.audioSegmentLoader_,
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SUBTITLES: this.subtitleSegmentLoader_,
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main: this.mainSegmentLoader_
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},
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tech: this.tech_,
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requestOptions: this.requestOptions_,
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masterPlaylistLoader: this.masterPlaylistLoader_,
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vhs: this.vhs_,
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master: this.master(),
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mediaTypes: this.mediaTypes_,
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blacklistCurrentPlaylist: this.blacklistCurrentPlaylist.bind(this)
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});
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this.triggerPresenceUsage_(this.master(), media);
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this.setupFirstPlay();
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if (!this.mediaTypes_.AUDIO.activePlaylistLoader ||
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this.mediaTypes_.AUDIO.activePlaylistLoader.media()) {
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this.trigger('selectedinitialmedia');
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} else {
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// We must wait for the active audio playlist loader to
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// finish setting up before triggering this event so the
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// representations API and EME setup is correct
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this.mediaTypes_.AUDIO.activePlaylistLoader.one('loadedmetadata', () => {
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this.trigger('selectedinitialmedia');
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});
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}
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});
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this.masterPlaylistLoader_.on('loadedplaylist', () => {
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if (this.loadOnPlay_) {
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this.tech_.off('play', this.loadOnPlay_);
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}
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let updatedPlaylist = this.masterPlaylistLoader_.media();
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if (!updatedPlaylist) {
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// exclude any variants that are not supported by the browser before selecting
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// an initial media as the playlist selectors do not consider browser support
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this.excludeUnsupportedVariants_();
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let selectedMedia;
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if (this.enableLowInitialPlaylist) {
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selectedMedia = this.selectInitialPlaylist();
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}
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if (!selectedMedia) {
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selectedMedia = this.selectPlaylist();
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}
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|
|
if (!selectedMedia || !this.shouldSwitchToMedia_(selectedMedia)) {
|
|
return;
|
|
}
|
|
|
|
this.initialMedia_ = selectedMedia;
|
|
|
|
this.switchMedia_(this.initialMedia_, 'initial');
|
|
|
|
// Under the standard case where a source URL is provided, loadedplaylist will
|
|
// fire again since the playlist will be requested. In the case of vhs-json
|
|
// (where the manifest object is provided as the source), when the media
|
|
// playlist's `segments` list is already available, a media playlist won't be
|
|
// requested, and loadedplaylist won't fire again, so the playlist handler must be
|
|
// called on its own here.
|
|
const haveJsonSource = this.sourceType_ === 'vhs-json' && this.initialMedia_.segments;
|
|
|
|
if (!haveJsonSource) {
|
|
return;
|
|
}
|
|
updatedPlaylist = this.initialMedia_;
|
|
}
|
|
|
|
this.handleUpdatedMediaPlaylist(updatedPlaylist);
|
|
});
|
|
|
|
this.masterPlaylistLoader_.on('error', () => {
|
|
this.blacklistCurrentPlaylist(this.masterPlaylistLoader_.error);
|
|
});
|
|
|
|
this.masterPlaylistLoader_.on('mediachanging', () => {
|
|
this.mainSegmentLoader_.abort();
|
|
this.mainSegmentLoader_.pause();
|
|
});
|
|
|
|
this.masterPlaylistLoader_.on('mediachange', () => {
|
|
const media = this.masterPlaylistLoader_.media();
|
|
const requestTimeout = (media.targetDuration * 1.5) * 1000;
|
|
|
|
// If we don't have any more available playlists, we don't want to
|
|
// timeout the request.
|
|
if (isLowestEnabledRendition(this.masterPlaylistLoader_.master, this.masterPlaylistLoader_.media())) {
|
|
this.requestOptions_.timeout = 0;
|
|
} else {
|
|
this.requestOptions_.timeout = requestTimeout;
|
|
}
|
|
|
|
// TODO: Create a new event on the PlaylistLoader that signals
|
|
// that the segments have changed in some way and use that to
|
|
// update the SegmentLoader instead of doing it twice here and
|
|
// on `loadedplaylist`
|
|
this.mainSegmentLoader_.playlist(media, this.requestOptions_);
|
|
|
|
this.mainSegmentLoader_.load();
|
|
|
|
this.tech_.trigger({
|
|
type: 'mediachange',
|
|
bubbles: true
|
|
});
|
|
});
|
|
|
|
this.masterPlaylistLoader_.on('playlistunchanged', () => {
|
|
const updatedPlaylist = this.masterPlaylistLoader_.media();
|
|
|
|
// ignore unchanged playlists that have already been
|
|
// excluded for not-changing. We likely just have a really slowly updating
|
|
// playlist.
|
|
if (updatedPlaylist.lastExcludeReason_ === 'playlist-unchanged') {
|
|
return;
|
|
}
|
|
|
|
const playlistOutdated = this.stuckAtPlaylistEnd_(updatedPlaylist);
|
|
|
|
if (playlistOutdated) {
|
|
// Playlist has stopped updating and we're stuck at its end. Try to
|
|
// blacklist it and switch to another playlist in the hope that that
|
|
// one is updating (and give the player a chance to re-adjust to the
|
|
// safe live point).
|
|
this.blacklistCurrentPlaylist({
|
|
message: 'Playlist no longer updating.',
|
|
reason: 'playlist-unchanged'
|
|
});
|
|
// useful for monitoring QoS
|
|
this.tech_.trigger('playliststuck');
|
|
}
|
|
});
|
|
|
|
this.masterPlaylistLoader_.on('renditiondisabled', () => {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-rendition-disabled'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-rendition-disabled'});
|
|
});
|
|
this.masterPlaylistLoader_.on('renditionenabled', () => {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-rendition-enabled'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-rendition-enabled'});
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Given an updated media playlist (whether it was loaded for the first time, or
|
|
* refreshed for live playlists), update any relevant properties and state to reflect
|
|
* changes in the media that should be accounted for (e.g., cues and duration).
|
|
*
|
|
* @param {Object} updatedPlaylist the updated media playlist object
|
|
*
|
|
* @private
|
|
*/
|
|
handleUpdatedMediaPlaylist(updatedPlaylist) {
|
|
if (this.useCueTags_) {
|
|
this.updateAdCues_(updatedPlaylist);
|
|
}
|
|
|
|
// TODO: Create a new event on the PlaylistLoader that signals
|
|
// that the segments have changed in some way and use that to
|
|
// update the SegmentLoader instead of doing it twice here and
|
|
// on `mediachange`
|
|
this.mainSegmentLoader_.playlist(updatedPlaylist, this.requestOptions_);
|
|
this.updateDuration(!updatedPlaylist.endList);
|
|
|
|
// If the player isn't paused, ensure that the segment loader is running,
|
|
// as it is possible that it was temporarily stopped while waiting for
|
|
// a playlist (e.g., in case the playlist errored and we re-requested it).
|
|
if (!this.tech_.paused()) {
|
|
this.mainSegmentLoader_.load();
|
|
if (this.audioSegmentLoader_) {
|
|
this.audioSegmentLoader_.load();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A helper function for triggerring presence usage events once per source
|
|
*
|
|
* @private
|
|
*/
|
|
triggerPresenceUsage_(master, media) {
|
|
const mediaGroups = master.mediaGroups || {};
|
|
let defaultDemuxed = true;
|
|
const audioGroupKeys = Object.keys(mediaGroups.AUDIO);
|
|
|
|
for (const mediaGroup in mediaGroups.AUDIO) {
|
|
for (const label in mediaGroups.AUDIO[mediaGroup]) {
|
|
const properties = mediaGroups.AUDIO[mediaGroup][label];
|
|
|
|
if (!properties.uri) {
|
|
defaultDemuxed = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (defaultDemuxed) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-demuxed'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-demuxed'});
|
|
}
|
|
|
|
if (Object.keys(mediaGroups.SUBTITLES).length) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-webvtt'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-webvtt'});
|
|
}
|
|
|
|
if (Vhs.Playlist.isAes(media)) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-aes'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-aes'});
|
|
}
|
|
|
|
if (audioGroupKeys.length &&
|
|
Object.keys(mediaGroups.AUDIO[audioGroupKeys[0]]).length > 1) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-alternate-audio'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-alternate-audio'});
|
|
}
|
|
|
|
if (this.useCueTags_) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-playlist-cue-tags'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-playlist-cue-tags'});
|
|
}
|
|
}
|
|
|
|
shouldSwitchToMedia_(nextPlaylist) {
|
|
const currentPlaylist = this.masterPlaylistLoader_.media();
|
|
const buffered = this.tech_.buffered();
|
|
const forwardBuffer = buffered.length ?
|
|
buffered.end(buffered.length - 1) - this.tech_.currentTime() : 0;
|
|
|
|
const bufferLowWaterLine = this.bufferLowWaterLine();
|
|
const bufferHighWaterLine = this.bufferHighWaterLine();
|
|
|
|
return shouldSwitchToMedia({
|
|
currentPlaylist,
|
|
nextPlaylist,
|
|
forwardBuffer,
|
|
bufferLowWaterLine,
|
|
bufferHighWaterLine,
|
|
duration: this.duration(),
|
|
experimentalBufferBasedABR: this.experimentalBufferBasedABR,
|
|
log: this.logger_
|
|
});
|
|
}
|
|
/**
|
|
* Register event handlers on the segment loaders. A helper function
|
|
* for construction time.
|
|
*
|
|
* @private
|
|
*/
|
|
setupSegmentLoaderListeners_() {
|
|
if (!this.experimentalBufferBasedABR) {
|
|
this.mainSegmentLoader_.on('bandwidthupdate', () => {
|
|
const nextPlaylist = this.selectPlaylist();
|
|
|
|
if (this.shouldSwitchToMedia_(nextPlaylist)) {
|
|
this.switchMedia_(nextPlaylist, 'bandwidthupdate');
|
|
}
|
|
|
|
this.tech_.trigger('bandwidthupdate');
|
|
});
|
|
|
|
this.mainSegmentLoader_.on('progress', () => {
|
|
this.trigger('progress');
|
|
});
|
|
}
|
|
|
|
this.mainSegmentLoader_.on('error', () => {
|
|
this.blacklistCurrentPlaylist(this.mainSegmentLoader_.error());
|
|
});
|
|
|
|
this.mainSegmentLoader_.on('appenderror', () => {
|
|
this.error = this.mainSegmentLoader_.error_;
|
|
this.trigger('error');
|
|
});
|
|
|
|
this.mainSegmentLoader_.on('syncinfoupdate', () => {
|
|
this.onSyncInfoUpdate_();
|
|
});
|
|
|
|
this.mainSegmentLoader_.on('timestampoffset', () => {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-timestamp-offset'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-timestamp-offset'});
|
|
});
|
|
this.audioSegmentLoader_.on('syncinfoupdate', () => {
|
|
this.onSyncInfoUpdate_();
|
|
});
|
|
|
|
this.audioSegmentLoader_.on('appenderror', () => {
|
|
this.error = this.audioSegmentLoader_.error_;
|
|
this.trigger('error');
|
|
});
|
|
|
|
this.mainSegmentLoader_.on('ended', () => {
|
|
this.logger_('main segment loader ended');
|
|
this.onEndOfStream();
|
|
});
|
|
|
|
this.mainSegmentLoader_.on('earlyabort', (event) => {
|
|
// never try to early abort with the new ABR algorithm
|
|
if (this.experimentalBufferBasedABR) {
|
|
return;
|
|
}
|
|
|
|
this.delegateLoaders_('all', ['abort']);
|
|
|
|
this.blacklistCurrentPlaylist({
|
|
message: 'Aborted early because there isn\'t enough bandwidth to complete the ' +
|
|
'request without rebuffering.'
|
|
}, ABORT_EARLY_BLACKLIST_SECONDS);
|
|
});
|
|
|
|
const updateCodecs = () => {
|
|
if (!this.sourceUpdater_.hasCreatedSourceBuffers()) {
|
|
return this.tryToCreateSourceBuffers_();
|
|
}
|
|
|
|
const codecs = this.getCodecsOrExclude_();
|
|
|
|
// no codecs means that the playlist was excluded
|
|
if (!codecs) {
|
|
return;
|
|
}
|
|
|
|
this.sourceUpdater_.addOrChangeSourceBuffers(codecs);
|
|
};
|
|
|
|
this.mainSegmentLoader_.on('trackinfo', updateCodecs);
|
|
this.audioSegmentLoader_.on('trackinfo', updateCodecs);
|
|
|
|
this.mainSegmentLoader_.on('fmp4', () => {
|
|
if (!this.triggeredFmp4Usage) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-fmp4'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-fmp4'});
|
|
this.triggeredFmp4Usage = true;
|
|
}
|
|
});
|
|
|
|
this.audioSegmentLoader_.on('fmp4', () => {
|
|
if (!this.triggeredFmp4Usage) {
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-fmp4'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-fmp4'});
|
|
this.triggeredFmp4Usage = true;
|
|
}
|
|
});
|
|
|
|
this.audioSegmentLoader_.on('ended', () => {
|
|
this.logger_('audioSegmentLoader ended');
|
|
this.onEndOfStream();
|
|
});
|
|
}
|
|
|
|
mediaSecondsLoaded_() {
|
|
return Math.max(this.audioSegmentLoader_.mediaSecondsLoaded +
|
|
this.mainSegmentLoader_.mediaSecondsLoaded);
|
|
}
|
|
|
|
/**
|
|
* Call load on our SegmentLoaders
|
|
*/
|
|
load() {
|
|
this.mainSegmentLoader_.load();
|
|
if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
|
|
this.audioSegmentLoader_.load();
|
|
}
|
|
if (this.mediaTypes_.SUBTITLES.activePlaylistLoader) {
|
|
this.subtitleSegmentLoader_.load();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Re-tune playback quality level for the current player
|
|
* conditions without performing destructive actions, like
|
|
* removing already buffered content
|
|
*
|
|
* @private
|
|
* @deprecated
|
|
*/
|
|
smoothQualityChange_(media = this.selectPlaylist()) {
|
|
this.fastQualityChange_(media);
|
|
}
|
|
|
|
/**
|
|
* Re-tune playback quality level for the current player
|
|
* conditions. This method will perform destructive actions like removing
|
|
* already buffered content in order to readjust the currently active
|
|
* playlist quickly. This is good for manual quality changes
|
|
*
|
|
* @private
|
|
*/
|
|
fastQualityChange_(media = this.selectPlaylist()) {
|
|
if (media === this.masterPlaylistLoader_.media()) {
|
|
this.logger_('skipping fastQualityChange because new media is same as old');
|
|
return;
|
|
}
|
|
|
|
this.switchMedia_(media, 'fast-quality');
|
|
|
|
// Delete all buffered data to allow an immediate quality switch, then seek to give
|
|
// the browser a kick to remove any cached frames from the previous rendtion (.04 seconds
|
|
// ahead is roughly the minimum that will accomplish this across a variety of content
|
|
// in IE and Edge, but seeking in place is sufficient on all other browsers)
|
|
// Edge/IE bug: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/14600375/
|
|
// Chrome bug: https://bugs.chromium.org/p/chromium/issues/detail?id=651904
|
|
this.mainSegmentLoader_.resetEverything(() => {
|
|
// Since this is not a typical seek, we avoid the seekTo method which can cause segments
|
|
// from the previously enabled rendition to load before the new playlist has finished loading
|
|
if (videojs.browser.IE_VERSION || videojs.browser.IS_EDGE) {
|
|
this.tech_.setCurrentTime(this.tech_.currentTime() + 0.04);
|
|
} else {
|
|
this.tech_.setCurrentTime(this.tech_.currentTime());
|
|
}
|
|
});
|
|
|
|
// don't need to reset audio as it is reset when media changes
|
|
}
|
|
|
|
/**
|
|
* Begin playback.
|
|
*/
|
|
play() {
|
|
if (this.setupFirstPlay()) {
|
|
return;
|
|
}
|
|
|
|
if (this.tech_.ended()) {
|
|
this.tech_.setCurrentTime(0);
|
|
}
|
|
|
|
if (this.hasPlayed_) {
|
|
this.load();
|
|
}
|
|
|
|
const seekable = this.tech_.seekable();
|
|
|
|
// if the viewer has paused and we fell out of the live window,
|
|
// seek forward to the live point
|
|
if (this.tech_.duration() === Infinity) {
|
|
if (this.tech_.currentTime() < seekable.start(0)) {
|
|
return this.tech_.setCurrentTime(seekable.end(seekable.length - 1));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Seek to the latest media position if this is a live video and the
|
|
* player and video are loaded and initialized.
|
|
*/
|
|
setupFirstPlay() {
|
|
const media = this.masterPlaylistLoader_.media();
|
|
|
|
// Check that everything is ready to begin buffering for the first call to play
|
|
// If 1) there is no active media
|
|
// 2) the player is paused
|
|
// 3) the first play has already been setup
|
|
// then exit early
|
|
if (!media || this.tech_.paused() || this.hasPlayed_) {
|
|
return false;
|
|
}
|
|
|
|
// when the video is a live stream
|
|
if (!media.endList) {
|
|
const seekable = this.seekable();
|
|
|
|
if (!seekable.length) {
|
|
// without a seekable range, the player cannot seek to begin buffering at the live
|
|
// point
|
|
return false;
|
|
}
|
|
|
|
if (videojs.browser.IE_VERSION &&
|
|
this.tech_.readyState() === 0) {
|
|
// IE11 throws an InvalidStateError if you try to set currentTime while the
|
|
// readyState is 0, so it must be delayed until the tech fires loadedmetadata.
|
|
this.tech_.one('loadedmetadata', () => {
|
|
this.trigger('firstplay');
|
|
this.tech_.setCurrentTime(seekable.end(0));
|
|
this.hasPlayed_ = true;
|
|
});
|
|
|
|
return false;
|
|
}
|
|
|
|
// trigger firstplay to inform the source handler to ignore the next seek event
|
|
this.trigger('firstplay');
|
|
// seek to the live point
|
|
this.tech_.setCurrentTime(seekable.end(0));
|
|
}
|
|
|
|
this.hasPlayed_ = true;
|
|
// we can begin loading now that everything is ready
|
|
this.load();
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* handle the sourceopen event on the MediaSource
|
|
*
|
|
* @private
|
|
*/
|
|
handleSourceOpen_() {
|
|
// Only attempt to create the source buffer if none already exist.
|
|
// handleSourceOpen is also called when we are "re-opening" a source buffer
|
|
// after `endOfStream` has been called (in response to a seek for instance)
|
|
this.tryToCreateSourceBuffers_();
|
|
|
|
// if autoplay is enabled, begin playback. This is duplicative of
|
|
// code in video.js but is required because play() must be invoked
|
|
// *after* the media source has opened.
|
|
if (this.tech_.autoplay()) {
|
|
const playPromise = this.tech_.play();
|
|
|
|
// Catch/silence error when a pause interrupts a play request
|
|
// on browsers which return a promise
|
|
if (typeof playPromise !== 'undefined' && typeof playPromise.then === 'function') {
|
|
playPromise.then(null, (e) => {});
|
|
}
|
|
}
|
|
|
|
this.trigger('sourceopen');
|
|
}
|
|
|
|
/**
|
|
* handle the sourceended event on the MediaSource
|
|
*
|
|
* @private
|
|
*/
|
|
handleSourceEnded_() {
|
|
if (!this.inbandTextTracks_.metadataTrack_) {
|
|
return;
|
|
}
|
|
|
|
const cues = this.inbandTextTracks_.metadataTrack_.cues;
|
|
|
|
if (!cues || !cues.length) {
|
|
return;
|
|
}
|
|
|
|
const duration = this.duration();
|
|
|
|
cues[cues.length - 1].endTime = isNaN(duration) || Math.abs(duration) === Infinity ?
|
|
Number.MAX_VALUE : duration;
|
|
}
|
|
|
|
/**
|
|
* handle the durationchange event on the MediaSource
|
|
*
|
|
* @private
|
|
*/
|
|
handleDurationChange_() {
|
|
this.tech_.trigger('durationchange');
|
|
}
|
|
|
|
/**
|
|
* Calls endOfStream on the media source when all active stream types have called
|
|
* endOfStream
|
|
*
|
|
* @param {string} streamType
|
|
* Stream type of the segment loader that called endOfStream
|
|
* @private
|
|
*/
|
|
onEndOfStream() {
|
|
let isEndOfStream = this.mainSegmentLoader_.ended_;
|
|
|
|
if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
|
|
// if the audio playlist loader exists, then alternate audio is active
|
|
if (!this.mainSegmentLoader_.currentMediaInfo_ ||
|
|
this.mainSegmentLoader_.currentMediaInfo_.hasVideo) {
|
|
// if we do not know if the main segment loader contains video yet or if we
|
|
// definitively know the main segment loader contains video, then we need to wait
|
|
// for both main and audio segment loaders to call endOfStream
|
|
isEndOfStream = isEndOfStream && this.audioSegmentLoader_.ended_;
|
|
} else {
|
|
// otherwise just rely on the audio loader
|
|
isEndOfStream = this.audioSegmentLoader_.ended_;
|
|
}
|
|
}
|
|
|
|
if (!isEndOfStream) {
|
|
return;
|
|
}
|
|
|
|
this.stopABRTimer_();
|
|
this.sourceUpdater_.endOfStream();
|
|
}
|
|
|
|
/**
|
|
* Check if a playlist has stopped being updated
|
|
*
|
|
* @param {Object} playlist the media playlist object
|
|
* @return {boolean} whether the playlist has stopped being updated or not
|
|
*/
|
|
stuckAtPlaylistEnd_(playlist) {
|
|
const seekable = this.seekable();
|
|
|
|
if (!seekable.length) {
|
|
// playlist doesn't have enough information to determine whether we are stuck
|
|
return false;
|
|
}
|
|
|
|
const expired =
|
|
this.syncController_.getExpiredTime(playlist, this.duration());
|
|
|
|
if (expired === null) {
|
|
return false;
|
|
}
|
|
|
|
// does not use the safe live end to calculate playlist end, since we
|
|
// don't want to say we are stuck while there is still content
|
|
const absolutePlaylistEnd = Vhs.Playlist.playlistEnd(playlist, expired);
|
|
const currentTime = this.tech_.currentTime();
|
|
const buffered = this.tech_.buffered();
|
|
|
|
if (!buffered.length) {
|
|
// return true if the playhead reached the absolute end of the playlist
|
|
return absolutePlaylistEnd - currentTime <= Ranges.SAFE_TIME_DELTA;
|
|
}
|
|
const bufferedEnd = buffered.end(buffered.length - 1);
|
|
|
|
// return true if there is too little buffer left and buffer has reached absolute
|
|
// end of playlist
|
|
return bufferedEnd - currentTime <= Ranges.SAFE_TIME_DELTA &&
|
|
absolutePlaylistEnd - bufferedEnd <= Ranges.SAFE_TIME_DELTA;
|
|
}
|
|
|
|
/**
|
|
* Blacklists a playlist when an error occurs for a set amount of time
|
|
* making it unavailable for selection by the rendition selection algorithm
|
|
* and then forces a new playlist (rendition) selection.
|
|
*
|
|
* @param {Object=} error an optional error that may include the playlist
|
|
* to blacklist
|
|
* @param {number=} blacklistDuration an optional number of seconds to blacklist the
|
|
* playlist
|
|
*/
|
|
blacklistCurrentPlaylist(error = {}, blacklistDuration) {
|
|
// If the `error` was generated by the playlist loader, it will contain
|
|
// the playlist we were trying to load (but failed) and that should be
|
|
// blacklisted instead of the currently selected playlist which is likely
|
|
// out-of-date in this scenario
|
|
const currentPlaylist = error.playlist || this.masterPlaylistLoader_.media();
|
|
|
|
blacklistDuration = blacklistDuration ||
|
|
error.blacklistDuration ||
|
|
this.blacklistDuration;
|
|
|
|
// If there is no current playlist, then an error occurred while we were
|
|
// trying to load the master OR while we were disposing of the tech
|
|
if (!currentPlaylist) {
|
|
this.error = error;
|
|
|
|
if (this.mediaSource.readyState !== 'open') {
|
|
this.trigger('error');
|
|
} else {
|
|
this.sourceUpdater_.endOfStream('network');
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
currentPlaylist.playlistErrors_++;
|
|
|
|
const playlists = this.masterPlaylistLoader_.master.playlists;
|
|
const enabledPlaylists = playlists.filter(isEnabled);
|
|
const isFinalRendition = enabledPlaylists.length === 1 && enabledPlaylists[0] === currentPlaylist;
|
|
|
|
// Don't blacklist the only playlist unless it was blacklisted
|
|
// forever
|
|
if (playlists.length === 1 && blacklistDuration !== Infinity) {
|
|
videojs.log.warn(`Problem encountered with playlist ${currentPlaylist.id}. ` +
|
|
'Trying again since it is the only playlist.');
|
|
|
|
this.tech_.trigger('retryplaylist');
|
|
// if this is a final rendition, we should delay
|
|
return this.masterPlaylistLoader_.load(isFinalRendition);
|
|
}
|
|
|
|
if (isFinalRendition) {
|
|
// Since we're on the final non-blacklisted playlist, and we're about to blacklist
|
|
// it, instead of erring the player or retrying this playlist, clear out the current
|
|
// blacklist. This allows other playlists to be attempted in case any have been
|
|
// fixed.
|
|
let reincluded = false;
|
|
|
|
playlists.forEach((playlist) => {
|
|
// skip current playlist which is about to be blacklisted
|
|
if (playlist === currentPlaylist) {
|
|
return;
|
|
}
|
|
const excludeUntil = playlist.excludeUntil;
|
|
|
|
// a playlist cannot be reincluded if it wasn't excluded to begin with.
|
|
if (typeof excludeUntil !== 'undefined' && excludeUntil !== Infinity) {
|
|
reincluded = true;
|
|
delete playlist.excludeUntil;
|
|
}
|
|
});
|
|
|
|
if (reincluded) {
|
|
videojs.log.warn('Removing other playlists from the exclusion list because the last ' +
|
|
'rendition is about to be excluded.');
|
|
// Technically we are retrying a playlist, in that we are simply retrying a previous
|
|
// playlist. This is needed for users relying on the retryplaylist event to catch a
|
|
// case where the player might be stuck and looping through "dead" playlists.
|
|
this.tech_.trigger('retryplaylist');
|
|
}
|
|
}
|
|
|
|
// Blacklist this playlist
|
|
let excludeUntil;
|
|
|
|
if (currentPlaylist.playlistErrors_ > this.maxPlaylistRetries) {
|
|
excludeUntil = Infinity;
|
|
} else {
|
|
excludeUntil = Date.now() + (blacklistDuration * 1000);
|
|
}
|
|
|
|
currentPlaylist.excludeUntil = excludeUntil;
|
|
|
|
if (error.reason) {
|
|
currentPlaylist.lastExcludeReason_ = error.reason;
|
|
}
|
|
this.tech_.trigger('blacklistplaylist');
|
|
this.tech_.trigger({type: 'usage', name: 'vhs-rendition-blacklisted'});
|
|
this.tech_.trigger({type: 'usage', name: 'hls-rendition-blacklisted'});
|
|
|
|
// TODO: should we select a new playlist if this blacklist wasn't for the currentPlaylist?
|
|
// Would be something like media().id !=== currentPlaylist.id and we would need something
|
|
// like `pendingMedia` in playlist loaders to check against that too. This will prevent us
|
|
// from loading a new playlist on any blacklist.
|
|
// Select a new playlist
|
|
const nextPlaylist = this.selectPlaylist();
|
|
|
|
if (!nextPlaylist) {
|
|
this.error = 'Playback cannot continue. No available working or supported playlists.';
|
|
this.trigger('error');
|
|
return;
|
|
}
|
|
|
|
const logFn = error.internal ? this.logger_ : videojs.log.warn;
|
|
const errorMessage = error.message ? (' ' + error.message) : '';
|
|
|
|
logFn(`${(error.internal ? 'Internal problem' : 'Problem')} encountered with playlist ${currentPlaylist.id}.` +
|
|
`${errorMessage} Switching to playlist ${nextPlaylist.id}.`);
|
|
|
|
// if audio group changed reset audio loaders
|
|
if (nextPlaylist.attributes.AUDIO !== currentPlaylist.attributes.AUDIO) {
|
|
this.delegateLoaders_('audio', ['abort', 'pause']);
|
|
}
|
|
|
|
// if subtitle group changed reset subtitle loaders
|
|
if (nextPlaylist.attributes.SUBTITLES !== currentPlaylist.attributes.SUBTITLES) {
|
|
this.delegateLoaders_('subtitle', ['abort', 'pause']);
|
|
}
|
|
|
|
this.delegateLoaders_('main', ['abort', 'pause']);
|
|
|
|
const delayDuration = (nextPlaylist.targetDuration / 2) * 1000 || 5 * 1000;
|
|
const shouldDelay = typeof nextPlaylist.lastRequest === 'number' &&
|
|
(Date.now() - nextPlaylist.lastRequest) <= delayDuration;
|
|
|
|
// delay if it's a final rendition or if the last refresh is sooner than half targetDuration
|
|
return this.switchMedia_(nextPlaylist, 'exclude', isFinalRendition || shouldDelay);
|
|
}
|
|
|
|
/**
|
|
* Pause all segment/playlist loaders
|
|
*/
|
|
pauseLoading() {
|
|
this.delegateLoaders_('all', ['abort', 'pause']);
|
|
this.stopABRTimer_();
|
|
}
|
|
|
|
/**
|
|
* Call a set of functions in order on playlist loaders, segment loaders,
|
|
* or both types of loaders.
|
|
*
|
|
* @param {string} filter
|
|
* Filter loaders that should call fnNames using a string. Can be:
|
|
* * all - run on all loaders
|
|
* * audio - run on all audio loaders
|
|
* * subtitle - run on all subtitle loaders
|
|
* * main - run on the main/master loaders
|
|
*
|
|
* @param {Array|string} fnNames
|
|
* A string or array of function names to call.
|
|
*/
|
|
delegateLoaders_(filter, fnNames) {
|
|
const loaders = [];
|
|
|
|
const dontFilterPlaylist = filter === 'all';
|
|
|
|
if (dontFilterPlaylist || filter === 'main') {
|
|
loaders.push(this.masterPlaylistLoader_);
|
|
}
|
|
|
|
const mediaTypes = [];
|
|
|
|
if (dontFilterPlaylist || filter === 'audio') {
|
|
mediaTypes.push('AUDIO');
|
|
}
|
|
|
|
if (dontFilterPlaylist || filter === 'subtitle') {
|
|
mediaTypes.push('CLOSED-CAPTIONS');
|
|
mediaTypes.push('SUBTITLES');
|
|
}
|
|
|
|
mediaTypes.forEach((mediaType) => {
|
|
const loader = this.mediaTypes_[mediaType] &&
|
|
this.mediaTypes_[mediaType].activePlaylistLoader;
|
|
|
|
if (loader) {
|
|
loaders.push(loader);
|
|
}
|
|
});
|
|
|
|
['main', 'audio', 'subtitle'].forEach((name) => {
|
|
const loader = this[`${name}SegmentLoader_`];
|
|
|
|
if (loader && (filter === name || filter === 'all')) {
|
|
loaders.push(loader);
|
|
}
|
|
});
|
|
|
|
loaders.forEach((loader) => fnNames.forEach((fnName) => {
|
|
if (typeof loader[fnName] === 'function') {
|
|
loader[fnName]();
|
|
}
|
|
}));
|
|
}
|
|
|
|
/**
|
|
* set the current time on all segment loaders
|
|
*
|
|
* @param {TimeRange} currentTime the current time to set
|
|
* @return {TimeRange} the current time
|
|
*/
|
|
setCurrentTime(currentTime) {
|
|
const buffered = Ranges.findRange(this.tech_.buffered(), currentTime);
|
|
|
|
if (!(this.masterPlaylistLoader_ && this.masterPlaylistLoader_.media())) {
|
|
// return immediately if the metadata is not ready yet
|
|
return 0;
|
|
}
|
|
|
|
// it's clearly an edge-case but don't thrown an error if asked to
|
|
// seek within an empty playlist
|
|
if (!this.masterPlaylistLoader_.media().segments) {
|
|
return 0;
|
|
}
|
|
|
|
// if the seek location is already buffered, continue buffering as usual
|
|
if (buffered && buffered.length) {
|
|
return currentTime;
|
|
}
|
|
|
|
// cancel outstanding requests so we begin buffering at the new
|
|
// location
|
|
this.mainSegmentLoader_.resetEverything();
|
|
this.mainSegmentLoader_.abort();
|
|
if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
|
|
this.audioSegmentLoader_.resetEverything();
|
|
this.audioSegmentLoader_.abort();
|
|
}
|
|
if (this.mediaTypes_.SUBTITLES.activePlaylistLoader) {
|
|
this.subtitleSegmentLoader_.resetEverything();
|
|
this.subtitleSegmentLoader_.abort();
|
|
}
|
|
|
|
// start segment loader loading in case they are paused
|
|
this.load();
|
|
}
|
|
|
|
/**
|
|
* get the current duration
|
|
*
|
|
* @return {TimeRange} the duration
|
|
*/
|
|
duration() {
|
|
if (!this.masterPlaylistLoader_) {
|
|
return 0;
|
|
}
|
|
|
|
const media = this.masterPlaylistLoader_.media();
|
|
|
|
if (!media) {
|
|
// no playlists loaded yet, so can't determine a duration
|
|
return 0;
|
|
}
|
|
|
|
// Don't rely on the media source for duration in the case of a live playlist since
|
|
// setting the native MediaSource's duration to infinity ends up with consequences to
|
|
// seekable behavior. See https://github.com/w3c/media-source/issues/5 for details.
|
|
//
|
|
// This is resolved in the spec by https://github.com/w3c/media-source/pull/92,
|
|
// however, few browsers have support for setLiveSeekableRange()
|
|
// https://developer.mozilla.org/en-US/docs/Web/API/MediaSource/setLiveSeekableRange
|
|
//
|
|
// Until a time when the duration of the media source can be set to infinity, and a
|
|
// seekable range specified across browsers, just return Infinity.
|
|
if (!media.endList) {
|
|
return Infinity;
|
|
}
|
|
|
|
// Since this is a VOD video, it is safe to rely on the media source's duration (if
|
|
// available). If it's not available, fall back to a playlist-calculated estimate.
|
|
|
|
if (this.mediaSource) {
|
|
return this.mediaSource.duration;
|
|
}
|
|
|
|
return Vhs.Playlist.duration(media);
|
|
}
|
|
|
|
/**
|
|
* check the seekable range
|
|
*
|
|
* @return {TimeRange} the seekable range
|
|
*/
|
|
seekable() {
|
|
return this.seekable_;
|
|
}
|
|
|
|
onSyncInfoUpdate_() {
|
|
let audioSeekable;
|
|
|
|
if (!this.masterPlaylistLoader_) {
|
|
return;
|
|
}
|
|
|
|
let media = this.masterPlaylistLoader_.media();
|
|
|
|
if (!media) {
|
|
return;
|
|
}
|
|
|
|
let expired = this.syncController_.getExpiredTime(media, this.duration());
|
|
|
|
if (expired === null) {
|
|
// not enough information to update seekable
|
|
return;
|
|
}
|
|
|
|
const master = this.masterPlaylistLoader_.master;
|
|
const mainSeekable = Vhs.Playlist.seekable(
|
|
media,
|
|
expired,
|
|
Vhs.Playlist.liveEdgeDelay(master, media)
|
|
);
|
|
|
|
if (mainSeekable.length === 0) {
|
|
return;
|
|
}
|
|
|
|
if (this.mediaTypes_.AUDIO.activePlaylistLoader) {
|
|
media = this.mediaTypes_.AUDIO.activePlaylistLoader.media();
|
|
expired = this.syncController_.getExpiredTime(media, this.duration());
|
|
|
|
if (expired === null) {
|
|
return;
|
|
}
|
|
|
|
audioSeekable = Vhs.Playlist.seekable(
|
|
media,
|
|
expired,
|
|
Vhs.Playlist.liveEdgeDelay(master, media)
|
|
);
|
|
|
|
if (audioSeekable.length === 0) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
let oldEnd;
|
|
let oldStart;
|
|
|
|
if (this.seekable_ && this.seekable_.length) {
|
|
oldEnd = this.seekable_.end(0);
|
|
oldStart = this.seekable_.start(0);
|
|
}
|
|
|
|
if (!audioSeekable) {
|
|
// seekable has been calculated based on buffering video data so it
|
|
// can be returned directly
|
|
this.seekable_ = mainSeekable;
|
|
} else if (audioSeekable.start(0) > mainSeekable.end(0) ||
|
|
mainSeekable.start(0) > audioSeekable.end(0)) {
|
|
// seekables are pretty far off, rely on main
|
|
this.seekable_ = mainSeekable;
|
|
} else {
|
|
this.seekable_ = videojs.createTimeRanges([[
|
|
(audioSeekable.start(0) > mainSeekable.start(0)) ? audioSeekable.start(0) :
|
|
mainSeekable.start(0),
|
|
(audioSeekable.end(0) < mainSeekable.end(0)) ? audioSeekable.end(0) :
|
|
mainSeekable.end(0)
|
|
]]);
|
|
}
|
|
|
|
// seekable is the same as last time
|
|
if (this.seekable_ && this.seekable_.length) {
|
|
if (this.seekable_.end(0) === oldEnd && this.seekable_.start(0) === oldStart) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
this.logger_(`seekable updated [${Ranges.printableRange(this.seekable_)}]`);
|
|
|
|
this.tech_.trigger('seekablechanged');
|
|
}
|
|
|
|
/**
|
|
* Update the player duration
|
|
*/
|
|
updateDuration(isLive) {
|
|
if (this.updateDuration_) {
|
|
this.mediaSource.removeEventListener('sourceopen', this.updateDuration_);
|
|
this.updateDuration_ = null;
|
|
}
|
|
if (this.mediaSource.readyState !== 'open') {
|
|
this.updateDuration_ = this.updateDuration.bind(this, isLive);
|
|
this.mediaSource.addEventListener('sourceopen', this.updateDuration_);
|
|
return;
|
|
}
|
|
|
|
if (isLive) {
|
|
const seekable = this.seekable();
|
|
|
|
if (!seekable.length) {
|
|
return;
|
|
}
|
|
|
|
// Even in the case of a live playlist, the native MediaSource's duration should not
|
|
// be set to Infinity (even though this would be expected for a live playlist), since
|
|
// setting the native MediaSource's duration to infinity ends up with consequences to
|
|
// seekable behavior. See https://github.com/w3c/media-source/issues/5 for details.
|
|
//
|
|
// This is resolved in the spec by https://github.com/w3c/media-source/pull/92,
|
|
// however, few browsers have support for setLiveSeekableRange()
|
|
// https://developer.mozilla.org/en-US/docs/Web/API/MediaSource/setLiveSeekableRange
|
|
//
|
|
// Until a time when the duration of the media source can be set to infinity, and a
|
|
// seekable range specified across browsers, the duration should be greater than or
|
|
// equal to the last possible seekable value.
|
|
|
|
// MediaSource duration starts as NaN
|
|
// It is possible (and probable) that this case will never be reached for many
|
|
// sources, since the MediaSource reports duration as the highest value without
|
|
// accounting for timestamp offset. For example, if the timestamp offset is -100 and
|
|
// we buffered times 0 to 100 with real times of 100 to 200, even though current
|
|
// time will be between 0 and 100, the native media source may report the duration
|
|
// as 200. However, since we report duration separate from the media source (as
|
|
// Infinity), and as long as the native media source duration value is greater than
|
|
// our reported seekable range, seeks will work as expected. The large number as
|
|
// duration for live is actually a strategy used by some players to work around the
|
|
// issue of live seekable ranges cited above.
|
|
if (isNaN(this.mediaSource.duration) || this.mediaSource.duration < seekable.end(seekable.length - 1)) {
|
|
this.sourceUpdater_.setDuration(seekable.end(seekable.length - 1));
|
|
}
|
|
return;
|
|
}
|
|
|
|
const buffered = this.tech_.buffered();
|
|
let duration = Vhs.Playlist.duration(this.masterPlaylistLoader_.media());
|
|
|
|
if (buffered.length > 0) {
|
|
duration = Math.max(duration, buffered.end(buffered.length - 1));
|
|
}
|
|
|
|
if (this.mediaSource.duration !== duration) {
|
|
this.sourceUpdater_.setDuration(duration);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* dispose of the MasterPlaylistController and everything
|
|
* that it controls
|
|
*/
|
|
dispose() {
|
|
this.trigger('dispose');
|
|
this.decrypter_.terminate();
|
|
this.masterPlaylistLoader_.dispose();
|
|
this.mainSegmentLoader_.dispose();
|
|
|
|
if (this.loadOnPlay_) {
|
|
this.tech_.off('play', this.loadOnPlay_);
|
|
}
|
|
|
|
['AUDIO', 'SUBTITLES'].forEach((type) => {
|
|
const groups = this.mediaTypes_[type].groups;
|
|
|
|
for (const id in groups) {
|
|
groups[id].forEach((group) => {
|
|
if (group.playlistLoader) {
|
|
group.playlistLoader.dispose();
|
|
}
|
|
});
|
|
}
|
|
});
|
|
|
|
this.audioSegmentLoader_.dispose();
|
|
this.subtitleSegmentLoader_.dispose();
|
|
this.sourceUpdater_.dispose();
|
|
this.timelineChangeController_.dispose();
|
|
|
|
this.stopABRTimer_();
|
|
|
|
if (this.updateDuration_) {
|
|
this.mediaSource.removeEventListener('sourceopen', this.updateDuration_);
|
|
}
|
|
|
|
this.mediaSource.removeEventListener('durationchange', this.handleDurationChange_);
|
|
|
|
// load the media source into the player
|
|
this.mediaSource.removeEventListener('sourceopen', this.handleSourceOpen_);
|
|
this.mediaSource.removeEventListener('sourceended', this.handleSourceEnded_);
|
|
this.off();
|
|
}
|
|
|
|
/**
|
|
* return the master playlist object if we have one
|
|
*
|
|
* @return {Object} the master playlist object that we parsed
|
|
*/
|
|
master() {
|
|
return this.masterPlaylistLoader_.master;
|
|
}
|
|
|
|
/**
|
|
* return the currently selected playlist
|
|
*
|
|
* @return {Object} the currently selected playlist object that we parsed
|
|
*/
|
|
media() {
|
|
// playlist loader will not return media if it has not been fully loaded
|
|
return this.masterPlaylistLoader_.media() || this.initialMedia_;
|
|
}
|
|
|
|
areMediaTypesKnown_() {
|
|
const usingAudioLoader = !!this.mediaTypes_.AUDIO.activePlaylistLoader;
|
|
|
|
// one or both loaders has not loaded sufficently to get codecs
|
|
if (!this.mainSegmentLoader_.currentMediaInfo_ || (usingAudioLoader && !this.audioSegmentLoader_.currentMediaInfo_)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
getCodecsOrExclude_() {
|
|
const media = {
|
|
main: this.mainSegmentLoader_.currentMediaInfo_ || {},
|
|
audio: this.audioSegmentLoader_.currentMediaInfo_ || {}
|
|
};
|
|
|
|
// set "main" media equal to video
|
|
media.video = media.main;
|
|
const playlistCodecs = codecsForPlaylist(this.master(), this.media());
|
|
const codecs = {};
|
|
const usingAudioLoader = !!this.mediaTypes_.AUDIO.activePlaylistLoader;
|
|
|
|
if (media.main.hasVideo) {
|
|
codecs.video = playlistCodecs.video || media.main.videoCodec || DEFAULT_VIDEO_CODEC;
|
|
}
|
|
|
|
if (media.main.isMuxed) {
|
|
codecs.video += `,${playlistCodecs.audio || media.main.audioCodec || DEFAULT_AUDIO_CODEC}`;
|
|
}
|
|
|
|
if ((media.main.hasAudio && !media.main.isMuxed) || media.audio.hasAudio || usingAudioLoader) {
|
|
codecs.audio = playlistCodecs.audio || media.main.audioCodec || media.audio.audioCodec || DEFAULT_AUDIO_CODEC;
|
|
// set audio isFmp4 so we use the correct "supports" function below
|
|
media.audio.isFmp4 = (media.main.hasAudio && !media.main.isMuxed) ? media.main.isFmp4 : media.audio.isFmp4;
|
|
}
|
|
|
|
// no codecs, no playback.
|
|
if (!codecs.audio && !codecs.video) {
|
|
this.blacklistCurrentPlaylist({
|
|
playlist: this.media(),
|
|
message: 'Could not determine codecs for playlist.',
|
|
blacklistDuration: Infinity
|
|
});
|
|
return;
|
|
}
|
|
|
|
// fmp4 relies on browser support, while ts relies on muxer support
|
|
const supportFunction = (isFmp4, codec) => (isFmp4 ? browserSupportsCodec(codec) : muxerSupportsCodec(codec));
|
|
const unsupportedCodecs = {};
|
|
let unsupportedAudio;
|
|
|
|
['video', 'audio'].forEach(function(type) {
|
|
if (codecs.hasOwnProperty(type) && !supportFunction(media[type].isFmp4, codecs[type])) {
|
|
const supporter = media[type].isFmp4 ? 'browser' : 'muxer';
|
|
|
|
unsupportedCodecs[supporter] = unsupportedCodecs[supporter] || [];
|
|
unsupportedCodecs[supporter].push(codecs[type]);
|
|
|
|
if (type === 'audio') {
|
|
unsupportedAudio = supporter;
|
|
}
|
|
}
|
|
});
|
|
|
|
if (usingAudioLoader && unsupportedAudio && this.media().attributes.AUDIO) {
|
|
const audioGroup = this.media().attributes.AUDIO;
|
|
|
|
this.master().playlists.forEach(variant => {
|
|
const variantAudioGroup = variant.attributes && variant.attributes.AUDIO;
|
|
|
|
if (variantAudioGroup === audioGroup && variant !== this.media()) {
|
|
variant.excludeUntil = Infinity;
|
|
}
|
|
});
|
|
this.logger_(`excluding audio group ${audioGroup} as ${unsupportedAudio} does not support codec(s): "${codecs.audio}"`);
|
|
}
|
|
|
|
// if we have any unsupported codecs blacklist this playlist.
|
|
if (Object.keys(unsupportedCodecs).length) {
|
|
const message = Object.keys(unsupportedCodecs).reduce((acc, supporter) => {
|
|
|
|
if (acc) {
|
|
acc += ', ';
|
|
}
|
|
|
|
acc += `${supporter} does not support codec(s): "${unsupportedCodecs[supporter].join(',')}"`;
|
|
|
|
return acc;
|
|
}, '') + '.';
|
|
|
|
this.blacklistCurrentPlaylist({
|
|
playlist: this.media(),
|
|
internal: true,
|
|
message,
|
|
blacklistDuration: Infinity
|
|
});
|
|
return;
|
|
}
|
|
// check if codec switching is happening
|
|
if (
|
|
this.sourceUpdater_.hasCreatedSourceBuffers() &&
|
|
!this.sourceUpdater_.canChangeType()
|
|
) {
|
|
const switchMessages = [];
|
|
|
|
['video', 'audio'].forEach((type) => {
|
|
const newCodec = (parseCodecs(this.sourceUpdater_.codecs[type] || '')[0] || {}).type;
|
|
const oldCodec = (parseCodecs(codecs[type] || '')[0] || {}).type;
|
|
|
|
if (newCodec && oldCodec && newCodec.toLowerCase() !== oldCodec.toLowerCase()) {
|
|
switchMessages.push(`"${this.sourceUpdater_.codecs[type]}" -> "${codecs[type]}"`);
|
|
}
|
|
});
|
|
|
|
if (switchMessages.length) {
|
|
this.blacklistCurrentPlaylist({
|
|
playlist: this.media(),
|
|
message: `Codec switching not supported: ${switchMessages.join(', ')}.`,
|
|
blacklistDuration: Infinity,
|
|
internal: true
|
|
});
|
|
return;
|
|
}
|
|
}
|
|
|
|
// TODO: when using the muxer shouldn't we just return
|
|
// the codecs that the muxer outputs?
|
|
return codecs;
|
|
}
|
|
|
|
/**
|
|
* Create source buffers and exlude any incompatible renditions.
|
|
*
|
|
* @private
|
|
*/
|
|
tryToCreateSourceBuffers_() {
|
|
// media source is not ready yet or sourceBuffers are already
|
|
// created.
|
|
if (
|
|
this.mediaSource.readyState !== 'open' ||
|
|
this.sourceUpdater_.hasCreatedSourceBuffers()
|
|
) {
|
|
return;
|
|
}
|
|
|
|
if (!this.areMediaTypesKnown_()) {
|
|
return;
|
|
}
|
|
|
|
const codecs = this.getCodecsOrExclude_();
|
|
|
|
// no codecs means that the playlist was excluded
|
|
if (!codecs) {
|
|
return;
|
|
}
|
|
|
|
this.sourceUpdater_.createSourceBuffers(codecs);
|
|
|
|
const codecString = [codecs.video, codecs.audio].filter(Boolean).join(',');
|
|
|
|
this.excludeIncompatibleVariants_(codecString);
|
|
}
|
|
|
|
/**
|
|
* Excludes playlists with codecs that are unsupported by the muxer and browser.
|
|
*/
|
|
excludeUnsupportedVariants_() {
|
|
const playlists = this.master().playlists;
|
|
const ids = [];
|
|
|
|
// TODO: why don't we have a property to loop through all
|
|
// playlist? Why did we ever mix indexes and keys?
|
|
Object.keys(playlists).forEach(key => {
|
|
const variant = playlists[key];
|
|
|
|
// check if we already processed this playlist.
|
|
if (ids.indexOf(variant.id) !== -1) {
|
|
return;
|
|
}
|
|
|
|
ids.push(variant.id);
|
|
|
|
const codecs = codecsForPlaylist(this.master, variant);
|
|
const unsupported = [];
|
|
|
|
if (codecs.audio && !muxerSupportsCodec(codecs.audio) && !browserSupportsCodec(codecs.audio)) {
|
|
unsupported.push(`audio codec ${codecs.audio}`);
|
|
}
|
|
|
|
if (codecs.video && !muxerSupportsCodec(codecs.video) && !browserSupportsCodec(codecs.video)) {
|
|
unsupported.push(`video codec ${codecs.video}`);
|
|
}
|
|
|
|
if (codecs.text && codecs.text === 'stpp.ttml.im1t') {
|
|
unsupported.push(`text codec ${codecs.text}`);
|
|
}
|
|
|
|
if (unsupported.length) {
|
|
variant.excludeUntil = Infinity;
|
|
this.logger_(`excluding ${variant.id} for unsupported: ${unsupported.join(', ')}`);
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Blacklist playlists that are known to be codec or
|
|
* stream-incompatible with the SourceBuffer configuration. For
|
|
* instance, Media Source Extensions would cause the video element to
|
|
* stall waiting for video data if you switched from a variant with
|
|
* video and audio to an audio-only one.
|
|
*
|
|
* @param {Object} media a media playlist compatible with the current
|
|
* set of SourceBuffers. Variants in the current master playlist that
|
|
* do not appear to have compatible codec or stream configurations
|
|
* will be excluded from the default playlist selection algorithm
|
|
* indefinitely.
|
|
* @private
|
|
*/
|
|
excludeIncompatibleVariants_(codecString) {
|
|
const ids = [];
|
|
const playlists = this.master().playlists;
|
|
const codecs = unwrapCodecList(parseCodecs(codecString));
|
|
const codecCount_ = codecCount(codecs);
|
|
const videoDetails = codecs.video && parseCodecs(codecs.video)[0] || null;
|
|
const audioDetails = codecs.audio && parseCodecs(codecs.audio)[0] || null;
|
|
|
|
Object.keys(playlists).forEach((key) => {
|
|
const variant = playlists[key];
|
|
|
|
// check if we already processed this playlist.
|
|
// or it if it is already excluded forever.
|
|
if (ids.indexOf(variant.id) !== -1 || variant.excludeUntil === Infinity) {
|
|
return;
|
|
}
|
|
|
|
ids.push(variant.id);
|
|
const blacklistReasons = [];
|
|
|
|
// get codecs from the playlist for this variant
|
|
const variantCodecs = codecsForPlaylist(this.masterPlaylistLoader_.master, variant);
|
|
const variantCodecCount = codecCount(variantCodecs);
|
|
|
|
// if no codecs are listed, we cannot determine that this
|
|
// variant is incompatible. Wait for mux.js to probe
|
|
if (!variantCodecs.audio && !variantCodecs.video) {
|
|
return;
|
|
}
|
|
|
|
// TODO: we can support this by removing the
|
|
// old media source and creating a new one, but it will take some work.
|
|
// The number of streams cannot change
|
|
if (variantCodecCount !== codecCount_) {
|
|
blacklistReasons.push(`codec count "${variantCodecCount}" !== "${codecCount_}"`);
|
|
}
|
|
|
|
// only exclude playlists by codec change, if codecs cannot switch
|
|
// during playback.
|
|
if (!this.sourceUpdater_.canChangeType()) {
|
|
const variantVideoDetails = variantCodecs.video && parseCodecs(variantCodecs.video)[0] || null;
|
|
const variantAudioDetails = variantCodecs.audio && parseCodecs(variantCodecs.audio)[0] || null;
|
|
|
|
// the video codec cannot change
|
|
if (variantVideoDetails && videoDetails && variantVideoDetails.type.toLowerCase() !== videoDetails.type.toLowerCase()) {
|
|
blacklistReasons.push(`video codec "${variantVideoDetails.type}" !== "${videoDetails.type}"`);
|
|
}
|
|
|
|
// the audio codec cannot change
|
|
if (variantAudioDetails && audioDetails && variantAudioDetails.type.toLowerCase() !== audioDetails.type.toLowerCase()) {
|
|
blacklistReasons.push(`audio codec "${variantAudioDetails.type}" !== "${audioDetails.type}"`);
|
|
}
|
|
}
|
|
|
|
if (blacklistReasons.length) {
|
|
variant.excludeUntil = Infinity;
|
|
this.logger_(`blacklisting ${variant.id}: ${blacklistReasons.join(' && ')}`);
|
|
}
|
|
});
|
|
}
|
|
|
|
updateAdCues_(media) {
|
|
let offset = 0;
|
|
const seekable = this.seekable();
|
|
|
|
if (seekable.length) {
|
|
offset = seekable.start(0);
|
|
}
|
|
|
|
updateAdCues(media, this.cueTagsTrack_, offset);
|
|
}
|
|
|
|
/**
|
|
* Calculates the desired forward buffer length based on current time
|
|
*
|
|
* @return {number} Desired forward buffer length in seconds
|
|
*/
|
|
goalBufferLength() {
|
|
const currentTime = this.tech_.currentTime();
|
|
const initial = Config.GOAL_BUFFER_LENGTH;
|
|
const rate = Config.GOAL_BUFFER_LENGTH_RATE;
|
|
const max = Math.max(initial, Config.MAX_GOAL_BUFFER_LENGTH);
|
|
|
|
return Math.min(initial + currentTime * rate, max);
|
|
}
|
|
|
|
/**
|
|
* Calculates the desired buffer low water line based on current time
|
|
*
|
|
* @return {number} Desired buffer low water line in seconds
|
|
*/
|
|
bufferLowWaterLine() {
|
|
const currentTime = this.tech_.currentTime();
|
|
const initial = Config.BUFFER_LOW_WATER_LINE;
|
|
const rate = Config.BUFFER_LOW_WATER_LINE_RATE;
|
|
const max = Math.max(initial, Config.MAX_BUFFER_LOW_WATER_LINE);
|
|
const newMax = Math.max(initial, Config.EXPERIMENTAL_MAX_BUFFER_LOW_WATER_LINE);
|
|
|
|
return Math.min(initial + currentTime * rate, this.experimentalBufferBasedABR ? newMax : max);
|
|
}
|
|
|
|
bufferHighWaterLine() {
|
|
return Config.BUFFER_HIGH_WATER_LINE;
|
|
}
|
|
|
|
}
|