/**
* @file master-playlist-controller.js
*/
import PlaylistLoader from './playlist-loader';
import SegmentLoader from './segment-loader';
import Ranges from './ranges';
import videojs from 'video.js';
import AdCueTags from './ad-cue-tags';
// 5 minute blacklist
const BLACKLIST_DURATION = 5 * 60 * 1000;
let Hls;
/**
* determine if an object a is differnt from
* and object b. both only having one dimensional
* properties
*
* @param {Object} a object one
* @param {Object} b object two
* @return {Boolean} if the object has changed or not
*/
const objectChanged = function(a, b) {
if (typeof a !== typeof b) {
return true;
}
// if we have a different number of elements
// something has changed
if (Object.keys(a).length !== Object.keys(b).length) {
return true;
}
for (let prop in a) {
if (a[prop] !== b[prop]) {
return true;
}
}
return false;
};
/**
* Parses a codec string to retrieve the number of codecs specified,
* the video codec and object type indicator, and the audio profile.
*
* @private
*/
const parseCodecs = function(codecs) {
let result = {
codecCount: 0,
videoCodec: null,
videoObjectTypeIndicator: null,
audioProfile: null
};
let parsed;
result.codecCount = codecs.split(',').length;
result.codecCount = result.codecCount || 2;
// parse the video codec
parsed = (/(^|\s|,)+(avc1)([^ ,]*)/i).exec(codecs);
if (parsed) {
result.videoCodec = parsed[2];
result.videoObjectTypeIndicator = parsed[3];
}
// parse the last field of the audio codec
result.audioProfile =
(/(^|\s|,)+mp4a.[0-9A-Fa-f]+\.([0-9A-Fa-f]+)/i).exec(codecs);
result.audioProfile = result.audioProfile && result.audioProfile[2];
return result;
};
/**
* Calculates the MIME type strings for a working configuration of
* SourceBuffers to play variant streams in a master playlist. If
* there is no possible working configuration, an empty array will be
* returned.
*
* @param master {Object} the m3u8 object for the master playlist
* @param media {Object} the m3u8 object for the variant playlist
* @return {Array} the MIME type strings. If the array has more than
* one entry, the first element should be applied to the video
* SourceBuffer and the second to the audio SourceBuffer.
*
* @private
*/
export const mimeTypesForPlaylist_ = function(master, media) {
let container = 'mp2t';
let codecs = {
videoCodec: 'avc1',
videoObjectTypeIndicator: '.4d400d',
audioProfile: '2'
};
let audioGroup = [];
let mediaAttributes;
let previousGroup = null;
if (!media) {
// not enough information, return an error
return [];
}
// An initialization segment means the media playlists is an iframe
// playlist or is using the mp4 container. We don't currently
// support iframe playlists, so assume this is signalling mp4
// fragments.
// the existence check for segments can be removed once
// https://github.com/videojs/m3u8-parser/issues/8 is closed
if (media.segments && media.segments.length && media.segments[0].map) {
container = 'mp4';
}
// if the codecs were explicitly specified, use them instead of the
// defaults
mediaAttributes = media.attributes || {};
if (mediaAttributes.CODECS) {
let parsedCodecs = parseCodecs(mediaAttributes.CODECS);
Object.keys(parsedCodecs).forEach((key) => {
codecs[key] = parsedCodecs[key] || codecs[key];
});
}
if (master.mediaGroups.AUDIO) {
audioGroup = master.mediaGroups.AUDIO[mediaAttributes.AUDIO];
}
// if audio could be muxed or unmuxed, use mime types appropriate
// for both scenarios
for (let groupId in audioGroup) {
if (previousGroup && (!!audioGroup[groupId].uri !== !!previousGroup.uri)) {
// one source buffer with muxed video and audio and another for
// the alternate audio
return [
'video/' + container + '; codecs="' +
codecs.videoCodec + codecs.videoObjectTypeIndicator + ', mp4a.40.' + codecs.audioProfile + '"',
'audio/' + container + '; codecs="mp4a.40.' + codecs.audioProfile + '"'
];
}
previousGroup = audioGroup[groupId];
}
// if all video and audio is unmuxed, use two single-codec mime
// types
if (previousGroup && previousGroup.uri) {
return [
'video/' + container + '; codecs="' +
codecs.videoCodec + codecs.videoObjectTypeIndicator + '"',
'audio/' + container + '; codecs="mp4a.40.' + codecs.audioProfile + '"'
];
}
// all video and audio are muxed, use a dual-codec mime type
return [
'video/' + container + '; codecs="' +
codecs.videoCodec + codecs.videoObjectTypeIndicator +
', mp4a.40.' + codecs.audioProfile + '"'
];
};
/**
* the master playlist controller controller all interactons
* between playlists and segmentloaders. At this time this mainly
* involves a master playlist and a series of audio playlists
* if they are available
*
* @class MasterPlaylistController
* @extends videojs.EventTarget
*/
export class MasterPlaylistController extends videojs.EventTarget {
constructor(options) {
super();
let {
url,
withCredentials,
mode,
tech,
bandwidth,
externHls,
useCueTags
} = options;
if (!url) {
throw new Error('A non-empty playlist URL is required');
}
Hls = externHls;
this.withCredentials = withCredentials;
this.tech_ = tech;
this.hls_ = tech.hls;
this.mode_ = mode;
this.useCueTags_ = useCueTags;
if (this.useCueTags_) {
this.cueTagsTrack_ = this.tech_.addTextTrack('metadata',
'ad-cues');
this.cueTagsTrack_.inBandMetadataTrackDispatchType = '';
this.tech_.textTracks().addTrack_(this.cueTagsTrack_);
}
this.audioTracks_ = [];
this.requestOptions_ = {
withCredentials: this.withCredentials,
timeout: null
};
this.audioGroups_ = {};
this.mediaSource = new videojs.MediaSource({ mode });
this.audioinfo_ = null;
this.mediaSource.on('audioinfo', this.handleAudioinfoUpdate_.bind(this));
// load the media source into the player
this.mediaSource.addEventListener('sourceopen', this.handleSourceOpen_.bind(this));
this.hasPlayed_ = () => false;
let segmentLoaderOptions = {
hls: this.hls_,
mediaSource: this.mediaSource,
currentTime: this.tech_.currentTime.bind(this.tech_),
seekable: () => this.seekable(),
seeking: () => this.tech_.seeking(),
setCurrentTime: (a) => this.tech_.setCurrentTime(a),
hasPlayed: () => this.hasPlayed_(),
bandwidth
};
// setup playlist loaders
this.masterPlaylistLoader_ = new PlaylistLoader(url, this.hls_, this.withCredentials);
this.setupMasterPlaylistLoaderListeners_();
this.audioPlaylistLoader_ = null;
// setup segment loaders
// combined audio/video or just video when alternate audio track is selected
this.mainSegmentLoader_ = new SegmentLoader(segmentLoaderOptions);
// alternate audio track
this.audioSegmentLoader_ = new SegmentLoader(segmentLoaderOptions);
this.setupSegmentLoaderListeners_();
this.masterPlaylistLoader_.start();
}
/**
* Register event handlers on the master playlist loader. A helper
* function for construction time.
*
* @private
*/
setupMasterPlaylistLoaderListeners_() {
this.masterPlaylistLoader_.on('loadedmetadata', () => {
let media = this.masterPlaylistLoader_.media();
let requestTimeout = (this.masterPlaylistLoader_.targetDuration * 1.5) * 1000;
this.requestOptions_.timeout = requestTimeout;
// if this isn't a live video and preload permits, start
// downloading segments
if (media.endList && this.tech_.preload() !== 'none') {
this.mainSegmentLoader_.playlist(media, this.requestOptions_);
this.mainSegmentLoader_.load();
}
this.fillAudioTracks_();
this.setupAudio();
try {
this.setupSourceBuffers_();
} catch (e) {
videojs.log.warn('Failed to create SourceBuffers', e);
return this.mediaSource.endOfStream('decode');
}
this.setupFirstPlay();
this.trigger('audioupdate');
this.trigger('selectedinitialmedia');
});
this.masterPlaylistLoader_.on('loadedplaylist', () => {
let updatedPlaylist = this.masterPlaylistLoader_.media();
let seekable;
if (!updatedPlaylist) {
// select the initial variant
this.initialMedia_ = this.selectPlaylist();
this.masterPlaylistLoader_.media(this.initialMedia_);
return;
}
if (this.useCueTags_) {
this.updateAdCues_(updatedPlaylist,
this.masterPlaylistLoader_.expired_);
}
// 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();
// update seekable
seekable = this.seekable();
if (!updatedPlaylist.endList && seekable.length !== 0) {
this.mediaSource.addSeekableRange_(seekable.start(0), seekable.end(0));
}
});
this.masterPlaylistLoader_.on('error', () => {
this.blacklistCurrentPlaylist(this.masterPlaylistLoader_.error);
});
this.masterPlaylistLoader_.on('mediachanging', () => {
this.mainSegmentLoader_.abort();
this.mainSegmentLoader_.pause();
});
this.masterPlaylistLoader_.on('mediachange', () => {
let media = this.masterPlaylistLoader_.media();
let requestTimeout = (this.masterPlaylistLoader_.targetDuration * 1.5) * 1000;
let activeAudioGroup;
let activeTrack;
// If we don't have any more available playlists, we don't want to
// timeout the request.
if (this.masterPlaylistLoader_.isLowestEnabledRendition_()) {
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();
// if the audio group has changed, a new audio track has to be
// enabled
activeAudioGroup = this.activeAudioGroup();
activeTrack = activeAudioGroup.filter((track) => track.enabled)[0];
if (!activeTrack) {
this.setupAudio();
this.trigger('audioupdate');
}
this.tech_.trigger({
type: 'mediachange',
bubbles: true
});
});
}
/**
* Register event handlers on the segment loaders. A helper function
* for construction time.
*
* @private
*/
setupSegmentLoaderListeners_() {
this.mainSegmentLoader_.on('progress', () => {
// figure out what stream the next segment should be downloaded from
// with the updated bandwidth information
this.masterPlaylistLoader_.media(this.selectPlaylist());
this.trigger('progress');
});
this.mainSegmentLoader_.on('error', () => {
this.blacklistCurrentPlaylist(this.mainSegmentLoader_.error());
});
this.audioSegmentLoader_.on('error', () => {
videojs.log.warn('Problem encountered with the current alternate audio track' +
'. Switching back to default.');
this.audioSegmentLoader_.abort();
this.audioPlaylistLoader_ = null;
this.setupAudio();
});
}
handleAudioinfoUpdate_(event) {
if (Hls.supportsAudioInfoChange_() ||
!this.audioInfo_ ||
!objectChanged(this.audioInfo_, event.info)) {
this.audioInfo_ = event.info;
return;
}
let error = 'had different audio properties (channels, sample rate, etc.) ' +
'or changed in some other way. This behavior is currently ' +
'unsupported in Firefox 48 and below due to an issue: \n\n' +
'https://bugzilla.mozilla.org/show_bug.cgi?id=1247138\n\n';
let enabledIndex =
this.activeAudioGroup()
.map((track) => track.enabled)
.indexOf(true);
let enabledTrack = this.activeAudioGroup()[enabledIndex];
let defaultTrack = this.activeAudioGroup().filter((track) => {
return track.properties_ && track.properties_.default;
})[0];
// they did not switch audiotracks
// blacklist the current playlist
if (!this.audioPlaylistLoader_) {
error = `The rendition that we tried to switch to ${error}` +
'Unfortunately that means we will have to blacklist ' +
'the current playlist and switch to another. Sorry!';
this.blacklistCurrentPlaylist();
} else {
error = `The audio track '${enabledTrack.label}' that we tried to ` +
`switch to ${error} Unfortunately this means we will have to ` +
`return you to the main track '${defaultTrack.label}'. Sorry!`;
defaultTrack.enabled = true;
this.activeAudioGroup().splice(enabledIndex, 1);
this.trigger('audioupdate');
}
videojs.log.warn(error);
this.setupAudio();
}
/**
* get the total number of media requests from the `audiosegmentloader_`
* and the `mainSegmentLoader_`
*
* @private
*/
mediaRequests_() {
return this.audioSegmentLoader_.mediaRequests +
this.mainSegmentLoader_.mediaRequests;
}
/**
* get the total time that media requests have spent trnasfering
* from the `audiosegmentloader_` and the `mainSegmentLoader_`
*
* @private
*/
mediaTransferDuration_() {
return this.audioSegmentLoader_.mediaTransferDuration +
this.mainSegmentLoader_.mediaTransferDuration;
}
/**
* get the total number of bytes transfered during media requests
* from the `audiosegmentloader_` and the `mainSegmentLoader_`
*
* @private
*/
mediaBytesTransferred_() {
return this.audioSegmentLoader_.mediaBytesTransferred +
this.mainSegmentLoader_.mediaBytesTransferred;
}
mediaSecondsLoaded_() {
return Math.max(this.audioSegmentLoader_.mediaSecondsLoaded +
this.mainSegmentLoader_.mediaSecondsLoaded);
}
/**
* fill our internal list of HlsAudioTracks with data from
* the master playlist or use a default
*
* @private
*/
fillAudioTracks_() {
let master = this.master();
let mediaGroups = master.mediaGroups || {};
// force a default if we have none or we are not
// in html5 mode (the only mode to support more than one
// audio track)
if (!mediaGroups ||
!mediaGroups.AUDIO ||
Object.keys(mediaGroups.AUDIO).length === 0 ||
this.mode_ !== 'html5') {
// "main" audio group, track name "default"
mediaGroups.AUDIO = { main: { default: { default: true }}};
}
for (let mediaGroup in mediaGroups.AUDIO) {
if (!this.audioGroups_[mediaGroup]) {
this.audioGroups_[mediaGroup] = [];
}
for (let label in mediaGroups.AUDIO[mediaGroup]) {
let properties = mediaGroups.AUDIO[mediaGroup][label];
let track = new videojs.AudioTrack({
id: label,
kind: properties.default ? 'main' : 'alternative',
enabled: false,
language: properties.language,
label
});
track.properties_ = properties;
this.audioGroups_[mediaGroup].push(track);
}
}
// enable the default active track
(this.activeAudioGroup().filter((audioTrack) => {
return audioTrack.properties_.default;
})[0] || this.activeAudioGroup()[0]).enabled = true;
}
/**
* Call load on our SegmentLoaders
*/
load() {
this.mainSegmentLoader_.load();
if (this.audioPlaylistLoader_) {
this.audioSegmentLoader_.load();
}
}
/**
* Returns the audio group for the currently active primary
* media playlist.
*/
activeAudioGroup() {
let videoPlaylist = this.masterPlaylistLoader_.media();
let result;
if (videoPlaylist.attributes && videoPlaylist.attributes.AUDIO) {
result = this.audioGroups_[videoPlaylist.attributes.AUDIO];
}
return result || this.audioGroups_.main;
}
/**
* Determine the correct audio rendition based on the active
* AudioTrack and initialize a PlaylistLoader and SegmentLoader if
* necessary. This method is called once automatically before
* playback begins to enable the default audio track and should be
* invoked again if the track is changed.
*/
setupAudio() {
// determine whether seperate loaders are required for the audio
// rendition
let audioGroup = this.activeAudioGroup();
let track = audioGroup.filter((audioTrack) => {
return audioTrack.enabled;
})[0];
if (!track) {
track = audioGroup.filter((audioTrack) => {
return audioTrack.properties_.default;
})[0] || audioGroup[0];
track.enabled = true;
}
// stop playlist and segment loading for audio
if (this.audioPlaylistLoader_) {
this.audioPlaylistLoader_.dispose();
this.audioPlaylistLoader_ = null;
}
this.audioSegmentLoader_.pause();
if (!track.properties_.resolvedUri) {
this.mainSegmentLoader_.resetEverything();
return;
}
this.audioSegmentLoader_.resetEverything();
// startup playlist and segment loaders for the enabled audio
// track
this.audioPlaylistLoader_ = new PlaylistLoader(track.properties_.resolvedUri,
this.hls_,
this.withCredentials);
this.audioPlaylistLoader_.start();
this.audioPlaylistLoader_.on('loadedmetadata', () => {
let audioPlaylist = this.audioPlaylistLoader_.media();
this.audioSegmentLoader_.playlist(audioPlaylist, this.requestOptions_);
// if the video is already playing, or if this isn't a live video and preload
// permits, start downloading segments
if (!this.tech_.paused() ||
(audioPlaylist.endList && this.tech_.preload() !== 'none')) {
this.audioSegmentLoader_.load();
}
if (!audioPlaylist.endList) {
// trigger the playlist loader to start "expired time"-tracking
this.audioPlaylistLoader_.trigger('firstplay');
}
});
this.audioPlaylistLoader_.on('loadedplaylist', () => {
let updatedPlaylist;
if (this.audioPlaylistLoader_) {
updatedPlaylist = this.audioPlaylistLoader_.media();
}
if (!updatedPlaylist) {
// only one playlist to select
this.audioPlaylistLoader_.media(
this.audioPlaylistLoader_.playlists.master.playlists[0]);
return;
}
this.audioSegmentLoader_.playlist(updatedPlaylist, this.requestOptions_);
});
this.audioPlaylistLoader_.on('error', () => {
videojs.log.warn('Problem encountered loading the alternate audio track' +
'. Switching back to default.');
this.audioSegmentLoader_.abort();
this.setupAudio();
});
}
/**
* Re-tune playback quality level for the current player
* conditions. This method may perform destructive actions, like
* removing already buffered content, to readjust the currently
* active playlist quickly.
*
* @private
*/
fastQualityChange_() {
let media = this.selectPlaylist();
if (media !== this.masterPlaylistLoader_.media()) {
this.masterPlaylistLoader_.media(media);
this.mainSegmentLoader_.resetLoader();
if (this.audiosegmentloader_) {
this.audioSegmentLoader_.resetLoader();
}
}
}
/**
* Begin playback.
*/
play() {
if (this.setupFirstPlay()) {
return;
}
if (this.tech_.ended()) {
this.tech_.setCurrentTime(0);
}
if (this.hasPlayed_()) {
this.load();
}
// if the viewer has paused and we fell out of the live window,
// seek forward to the earliest available position
if (this.tech_.duration() === Infinity) {
if (this.tech_.currentTime() < this.tech_.seekable().start(0)) {
return this.tech_.setCurrentTime(this.tech_.seekable().start(0));
}
}
}
/**
* Seek to the latest media position if this is a live video and the
* player and video are loaded and initialized.
*/
setupFirstPlay() {
let seekable;
let media = this.masterPlaylistLoader_.media();
// check that everything is ready to begin buffering in the live
// scenario
// 1) the active media playlist is available
if (media &&
// 2) the player is not paused
!this.tech_.paused() &&
// 3) the player has not started playing
!this.hasPlayed_()) {
// when the video is a live stream
if (!media.endList) {
// trigger the playlist loader to start "expired time"-tracking
this.masterPlaylistLoader_.trigger('firstplay');
this.trigger('firstplay');
// seek to the latest media position for live videos
seekable = this.seekable();
if (seekable.length) {
this.tech_.setCurrentTime(seekable.end(0));
}
}
this.hasPlayed_ = () => true;
// now that we are ready, load the segment
this.load();
return true;
}
return false;
}
/**
* 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)
try {
this.setupSourceBuffers_();
} catch (e) {
videojs.log.warn('Failed to create Source Buffers', e);
return this.mediaSource.endOfStream('decode');
}
// 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()) {
this.tech_.play();
}
this.trigger('sourceopen');
}
/**
* 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
*/
blacklistCurrentPlaylist(error = {}) {
let currentPlaylist;
let nextPlaylist;
// 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
currentPlaylist = error.playlist || this.masterPlaylistLoader_.media();
// 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;
return this.mediaSource.endOfStream('network');
}
// Blacklist this playlist
currentPlaylist.excludeUntil = Date.now() + BLACKLIST_DURATION;
// Select a new playlist
nextPlaylist = this.selectPlaylist();
if (nextPlaylist) {
videojs.log.warn('Problem encountered with the current ' +
'HLS playlist. Switching to another playlist.');
return this.masterPlaylistLoader_.media(nextPlaylist);
}
videojs.log.warn('Problem encountered with the current ' +
'HLS playlist. No suitable alternatives found.');
// We have no more playlists we can select so we must fail
this.error = error;
return this.mediaSource.endOfStream('network');
}
/**
* Pause all segment loaders
*/
pauseLoading() {
this.mainSegmentLoader_.pause();
if (this.audioPlaylistLoader_) {
this.audioSegmentLoader_.pause();
}
}
/**
* set the current time on all segment loaders
*
* @param {TimeRange} currentTime the current time to set
* @return {TimeRange} the current time
*/
setCurrentTime(currentTime) {
let 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_.abort();
this.mainSegmentLoader_.resetEverything();
if (this.audioPlaylistLoader_) {
this.audioSegmentLoader_.abort();
this.audioSegmentLoader_.resetEverything();
}
if (!this.tech_.paused()) {
this.mainSegmentLoader_.load();
if (this.audioPlaylistLoader_) {
this.audioSegmentLoader_.load();
}
}
}
/**
* get the current duration
*
* @return {TimeRange} the duration
*/
duration() {
if (!this.masterPlaylistLoader_) {
return 0;
}
if (this.mediaSource) {
return this.mediaSource.duration;
}
return Hls.Playlist.duration(this.masterPlaylistLoader_.media());
}
/**
* check the seekable range
*
* @return {TimeRange} the seekable range
*/
seekable() {
let media;
let mainSeekable;
let audioSeekable;
if (!this.masterPlaylistLoader_) {
return videojs.createTimeRanges();
}
media = this.masterPlaylistLoader_.media();
if (!media) {
return videojs.createTimeRanges();
}
mainSeekable = Hls.Playlist.seekable(media,
this.masterPlaylistLoader_.expired_);
if (mainSeekable.length === 0) {
return mainSeekable;
}
if (this.audioPlaylistLoader_) {
audioSeekable = Hls.Playlist.seekable(this.audioPlaylistLoader_.media(),
this.audioPlaylistLoader_.expired_);
if (audioSeekable.length === 0) {
return audioSeekable;
}
}
if (!audioSeekable) {
// seekable has been calculated based on buffering video data so it
// can be returned directly
return mainSeekable;
}
return 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)
]]);
}
/**
* Update the player duration
*/
updateDuration() {
let oldDuration = this.mediaSource.duration;
let newDuration = Hls.Playlist.duration(this.masterPlaylistLoader_.media());
let buffered = this.tech_.buffered();
let setDuration = () => {
this.mediaSource.duration = newDuration;
this.tech_.trigger('durationchange');
this.mediaSource.removeEventListener('sourceopen', setDuration);
};
if (buffered.length > 0) {
newDuration = Math.max(newDuration, buffered.end(buffered.length - 1));
}
// if the duration has changed, invalidate the cached value
if (oldDuration !== newDuration) {
// update the duration
if (this.mediaSource.readyState !== 'open') {
this.mediaSource.addEventListener('sourceopen', setDuration);
} else {
setDuration();
}
}
}
/**
* dispose of the MasterPlaylistController and everything
* that it controls
*/
dispose() {
this.masterPlaylistLoader_.dispose();
this.mainSegmentLoader_.dispose();
this.audioSegmentLoader_.dispose();
}
/**
* 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_;
}
/**
* setup our internal source buffers on our segment Loaders
*
* @private
*/
setupSourceBuffers_() {
let media = this.masterPlaylistLoader_.media();
let mimeTypes;
// wait until a media playlist is available and the Media Source is
// attached
if (!media || this.mediaSource.readyState !== 'open') {
return;
}
mimeTypes = mimeTypesForPlaylist_(this.masterPlaylistLoader_.master, media);
if (mimeTypes.length < 1) {
this.error =
'No compatible SourceBuffer configuration for the variant stream:' +
media.resolvedUri;
return this.mediaSource.endOfStream('decode');
}
this.mainSegmentLoader_.mimeType(mimeTypes[0]);
if (mimeTypes[1]) {
this.audioSegmentLoader_.mimeType(mimeTypes[1]);
}
// exclude any incompatible variant streams from future playlist
// selection
this.excludeIncompatibleVariants_(media);
}
/**
* 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_(media) {
let master = this.masterPlaylistLoader_.master;
let codecCount = 2;
let videoCodec = null;
let audioProfile = null;
let codecs;
if (media.attributes && media.attributes.CODECS) {
codecs = parseCodecs(media.attributes.CODECS);
videoCodec = codecs.videoCodec;
audioProfile = codecs.audioProfile;
codecCount = codecs.codecCount;
}
master.playlists.forEach(function(variant) {
let variantCodecs = {
codecCount: 2,
videoCodec: null,
audioProfile: null
};
if (variant.attributes && variant.attributes.CODECS) {
let codecString = variant.attributes.CODECS;
variantCodecs = parseCodecs(codecString);
if (window.MediaSource &&
window.MediaSource.isTypeSupported &&
!window.MediaSource.isTypeSupported('video/mp4; codecs="' + codecString + '"')) {
variant.excludeUntil = Infinity;
}
}
// if the streams differ in the presence or absence of audio or
// video, they are incompatible
if (variantCodecs.codecCount !== codecCount) {
variant.excludeUntil = Infinity;
}
// if h.264 is specified on the current playlist, some flavor of
// it must be specified on all compatible variants
if (variantCodecs.videoCodec !== videoCodec) {
variant.excludeUntil = Infinity;
}
// HE-AAC ("mp4a.40.5") is incompatible with all other versions of
// AAC audio in Chrome 46. Don't mix the two.
if ((variantCodecs.audioProfile === '5' && audioProfile !== '5') ||
(audioProfile === '5' && variantCodecs.audioProfile !== '5')) {
variant.excludeUntil = Infinity;
}
});
}
updateAdCues_(media, offset = 0) {
AdCueTags.updateAdCues(media, this.cueTagsTrack_, offset);
}
}