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import {
ErrorTypes,
ErrorDetails
} from './errors';
import PlaylistLoader from './loader/playlist-loader';
import FragmentLoader from './loader/fragment-loader';
import KeyLoader from './loader/key-loader';
import StreamController from './controller/stream-controller';
import LevelController from './controller/level-controller';
import ID3TrackController from './controller/id3-track-controller';
import { isSupported } from './helper/is-supported';
import { logger, enableLogs } from './utils/logger';
import { hlsDefaultConfig } from './config';
import { FragmentTracker } from './helper/fragment-tracker';
import HlsEvents from './events';
import EventEmitter from 'events';
// polyfill for IE11
require('string.prototype.endswith');
/**
* @module Hls
* @class
* @constructor
*/
export default class Hls {
/**
* @type {string}
*/
static get version () {
return __VERSION__;
}
/**
* @type {boolean}
*/
static isSupported () {
return isSupported();
}
/**
* @type {HlsEvents}
*/
static get Events () {
return HlsEvents;
}
/**
* @type {HlsErrorTypes}
*/
static get ErrorTypes () {
return ErrorTypes;
}
/**
* @type {HlsErrorDetails}
*/
static get ErrorDetails () {
return ErrorDetails;
}
/**
* @type {HlsConfig}
*/
static get DefaultConfig () {
Eif (!Hls.defaultConfig)
return hlsDefaultConfig;
return Hls.defaultConfig;
}
/**
* @type {HlsConfig}
*/
static set DefaultConfig (defaultConfig) {
Hls.defaultConfig = defaultConfig;
}
/**
* Creates an instance of an HLS client that can attach to exactly one `HTMLMediaElement`.
*
* @constructs Hls
* @param {HlsConfig} config
*/
constructor (config = {}) {
let defaultConfig = Hls.DefaultConfig;
Iif ((config.liveSyncDurationCount || config.liveMaxLatencyDurationCount) && (config.liveSyncDuration || config.liveMaxLatencyDuration))
throw new Error('Illegal hls.js config: don\'t mix up liveSyncDurationCount/liveMaxLatencyDurationCount and liveSyncDuration/liveMaxLatencyDuration');
for (let prop in defaultConfig) {
if (prop in config) continue;
config[prop] = defaultConfig[prop];
}
Iif (config.liveMaxLatencyDurationCount !== undefined && config.liveMaxLatencyDurationCount <= config.liveSyncDurationCount)
throw new Error('Illegal hls.js config: "liveMaxLatencyDurationCount" must be gt "liveSyncDurationCount"');
Iif (config.liveMaxLatencyDuration !== undefined && (config.liveMaxLatencyDuration <= config.liveSyncDuration || config.liveSyncDuration === undefined))
throw new Error('Illegal hls.js config: "liveMaxLatencyDuration" must be gt "liveSyncDuration"');
enableLogs(config.debug);
this.config = config;
this._autoLevelCapping = -1;
// observer setup
let observer = this.observer = new EventEmitter();
observer.trigger = function trigger (event, ...data) {
observer.emit(event, event, ...data);
};
observer.off = function off (event, ...data) {
observer.removeListener(event, ...data);
};
this.on = observer.on.bind(observer);
this.off = observer.off.bind(observer);
this.trigger = observer.trigger.bind(observer);
// core controllers and network loaders
/**
* @member {AbrController} abrController
*/
const abrController = this.abrController = new config.abrController(this);
const bufferController = new config.bufferController(this);
const capLevelController = new config.capLevelController(this);
const fpsController = new config.fpsController(this);
const playListLoader = new PlaylistLoader(this);
const fragmentLoader = new FragmentLoader(this);
const keyLoader = new KeyLoader(this);
const id3TrackController = new ID3TrackController(this);
// network controllers
/**
* @member {LevelController} levelController
*/
const levelController = this.levelController = new LevelController(this);
// FIXME: FragmentTracker must be defined before StreamController because the order of event handling is important
const fragmentTracker = new FragmentTracker(this);
/**
* @member {StreamController} streamController
*/
const streamController = this.streamController = new StreamController(this, fragmentTracker);
let networkControllers = [levelController, streamController];
// optional audio stream controller
/**
* @var {ICoreComponent | Controller}
*/
let Controller = config.audioStreamController;
Eif (Controller)
networkControllers.push(new Controller(this, fragmentTracker));
/**
* @member {INetworkController[]} networkControllers
*/
this.networkControllers = networkControllers;
/**
* @var {ICoreComponent[]}
*/
const coreComponents = [
playListLoader,
fragmentLoader,
keyLoader,
abrController,
bufferController,
capLevelController,
fpsController,
id3TrackController,
fragmentTracker
];
// optional audio track and subtitle controller
Controller = config.audioTrackController;
Eif (Controller) {
const audioTrackController = new Controller(this);
/**
* @member {AudioTrackController} audioTrackController
*/
this.audioTrackController = audioTrackController;
coreComponents.push(audioTrackController);
}
Controller = config.subtitleTrackController;
Eif (Controller) {
const subtitleTrackController = new Controller(this);
/**
* @member {SubtitleTrackController} subtitleTrackController
*/
this.subtitleTrackController = subtitleTrackController;
coreComponents.push(subtitleTrackController);
}
Controller = config.emeController;
Eif (Controller) {
const emeController = new Controller(this);
/**
* @member {EMEController} emeController
*/
this.emeController = emeController;
coreComponents.push(emeController);
}
// optional subtitle controller
[config.subtitleStreamController, config.timelineController].forEach(Controller => {
Eif (Controller)
coreComponents.push(new Controller(this));
});
/**
* @member {ICoreComponent[]}
*/
this.coreComponents = coreComponents;
}
/**
* Dispose of the instance
*/
destroy () {
logger.log('destroy');
this.trigger(HlsEvents.DESTROYING);
this.detachMedia();
this.coreComponents.concat(this.networkControllers).forEach(component => { component.destroy(); });
this.url = null;
this.observer.removeAllListeners();
this._autoLevelCapping = -1;
}
/**
* Attach a media element
* @param {HTMLMediaElement} media
*/
attachMedia (media) {
logger.log('attachMedia');
this.media = media;
this.trigger(HlsEvents.MEDIA_ATTACHING, { media: media });
}
/**
* Detach from the media
*/
detachMedia () {
logger.log('detachMedia');
this.trigger(HlsEvents.MEDIA_DETACHING);
this.media = null;
}
/**
* Set the source URL. Can be relative or absolute.
* @param {string} url
*/
loadSource (url) {
url = URLToolkit.buildAbsoluteURL(window.location.href, url, { alwaysNormalize: true });
logger.log(`loadSource:${url}`);
this.url = url;
// when attaching to a source URL, trigger a playlist load
this.trigger(HlsEvents.MANIFEST_LOADING, { url: url });
}
/**
* Start loading data from the stream source.
* Depending on default config, client starts loading automatically when a source is set.
*
* @param {number} startPosition Set the start position to stream from
* @default -1 None (from earliest point)
*/
startLoad (startPosition = -1) {
logger.log(`startLoad(${startPosition})`);
this.networkControllers.forEach(controller => { controller.startLoad(startPosition); });
}
/**
* Stop loading of any stream data.
*/
stopLoad () {
logger.log('stopLoad');
this.networkControllers.forEach(controller => { controller.stopLoad(); });
}
/**
* Swap through possible audio codecs in the stream (for example to switch from stereo to 5.1)
*/
swapAudioCodec () {
logger.log('swapAudioCodec');
this.streamController.swapAudioCodec();
}
/**
* When the media-element fails, this allows to detach and then re-attach it
* as one call (convenience method).
*
* Automatic recovery of media-errors by this process is configurable.
*/
recoverMediaError () {
logger.log('recoverMediaError');
let media = this.media;
this.detachMedia();
this.attachMedia(media);
}
/**
* @type {QualityLevel[]}
*/
get levels () {
return this.levelController.levels;
}
/**
* Index of quality level currently played
* @type {number}
*/
get currentLevel () {
return this.streamController.currentLevel;
}
/**
* Set quality level index immediately .
* This will flush the current buffer to replace the quality asap.
* That means playback will interrupt at least shortly to re-buffer and re-sync eventually.
* @type {number} -1 for automatic level selection
*/
set currentLevel (newLevel) {
logger.log(`set currentLevel:${newLevel}`);
this.loadLevel = newLevel;
this.streamController.immediateLevelSwitch();
}
/**
* Index of next quality level loaded as scheduled by stream controller.
* @type {number}
*/
get nextLevel () {
return this.streamController.nextLevel;
}
/**
* Set quality level index for next loaded data.
* This will switch the video quality asap, without interrupting playback.
* May abort current loading of data, and flush parts of buffer (outside currently played fragment region).
* @type {number} -1 for automatic level selection
*/
set nextLevel (newLevel) {
logger.log(`set nextLevel:${newLevel}`);
this.levelController.manualLevel = newLevel;
this.streamController.nextLevelSwitch();
}
/**
* Return the quality level of the currently or last (of none is loaded currently) segment
* @type {number}
*/
get loadLevel () {
return this.levelController.level;
}
/**
* Set quality level index for next loaded data in a conservative way.
* This will switch the quality without flushing, but interrupt current loading.
* Thus the moment when the quality switch will appear in effect will only be after the already existing buffer.
* @type {number} newLevel -1 for automatic level selection
*/
set loadLevel (newLevel) {
logger.log(`set loadLevel:${newLevel}`);
this.levelController.manualLevel = newLevel;
}
/**
* get next quality level loaded
* @type {number}
*/
get nextLoadLevel () {
return this.levelController.nextLoadLevel;
}
/**
* Set quality level of next loaded segment in a fully "non-destructive" way.
* Same as `loadLevel` but will wait for next switch (until current loading is done).
* @type {number} level
*/
set nextLoadLevel (level) {
this.levelController.nextLoadLevel = level;
}
/**
* Return "first level": like a default level, if not set,
* falls back to index of first level referenced in manifest
* @type {number}
*/
get firstLevel () {
return Math.max(this.levelController.firstLevel, this.minAutoLevel);
}
/**
* Sets "first-level", see getter.
* @type {number}
*/
set firstLevel (newLevel) {
logger.log(`set firstLevel:${newLevel}`);
this.levelController.firstLevel = newLevel;
}
/**
* Return start level (level of first fragment that will be played back)
* if not overrided by user, first level appearing in manifest will be used as start level
* if -1 : automatic start level selection, playback will start from level matching download bandwidth
* (determined from download of first segment)
* @type {number}
*/
get startLevel () {
return this.levelController.startLevel;
}
/**
* set start level (level of first fragment that will be played back)
* if not overrided by user, first level appearing in manifest will be used as start level
* if -1 : automatic start level selection, playback will start from level matching download bandwidth
* (determined from download of first segment)
* @type {number} newLevel
*/
set startLevel (newLevel) {
logger.log(`set startLevel:${newLevel}`);
const hls = this;
// if not in automatic start level detection, ensure startLevel is greater than minAutoLevel
if (newLevel !== -1)
newLevel = Math.max(newLevel, hls.minAutoLevel);
hls.levelController.startLevel = newLevel;
}
/**
* Capping/max level value that should be used by automatic level selection algorithm (`ABRController`)
* @type {number}
*/
get autoLevelCapping () {
return this._autoLevelCapping;
}
/**
* Capping/max level value that should be used by automatic level selection algorithm (`ABRController`)
* @type {number}
*/
set autoLevelCapping (newLevel) {
logger.log(`set autoLevelCapping:${newLevel}`);
this._autoLevelCapping = newLevel;
}
/**
* True when automatic level selection enabled
* @type {boolean}
*/
get autoLevelEnabled () {
return (this.levelController.manualLevel === -1);
}
/**
* Level set manually (if any)
* @type {number}
*/
get manualLevel () {
return this.levelController.manualLevel;
}
/**
* min level selectable in auto mode according to config.minAutoBitrate
* @type {number}
*/
get minAutoLevel () {
let hls = this, levels = hls.levels, minAutoBitrate = hls.config.minAutoBitrate, len = levels ? levels.length : 0;
for (let i = 0; i < len; i++) {
const levelNextBitrate = levels[i].realBitrate ? Math.max(levels[i].realBitrate, levels[i].bitrate) : levels[i].bitrate;
Eif (levelNextBitrate > minAutoBitrate)
return i;
}
return 0;
}
/**
* max level selectable in auto mode according to autoLevelCapping
* @type {number}
*/
get maxAutoLevel () {
const hls = this;
const levels = hls.levels;
const autoLevelCapping = hls.autoLevelCapping;
let maxAutoLevel;
Eif (autoLevelCapping === -1 && levels && levels.length)
maxAutoLevel = levels.length - 1;
else
maxAutoLevel = autoLevelCapping;
return maxAutoLevel;
}
/**
* next automatically selected quality level
* @type {number}
*/
get nextAutoLevel () {
const hls = this;
// ensure next auto level is between min and max auto level
return Math.min(Math.max(hls.abrController.nextAutoLevel, hls.minAutoLevel), hls.maxAutoLevel);
}
/**
* this setter is used to force next auto level.
* this is useful to force a switch down in auto mode:
* in case of load error on level N, hls.js can set nextAutoLevel to N-1 for example)
* forced value is valid for one fragment. upon succesful frag loading at forced level,
* this value will be resetted to -1 by ABR controller.
* @type {number}
*/
set nextAutoLevel (nextLevel) {
const hls = this;
hls.abrController.nextAutoLevel = Math.max(hls.minAutoLevel, nextLevel);
}
/**
* @type {AudioTrack[]}
*/
get audioTracks () {
const audioTrackController = this.audioTrackController;
return audioTrackController ? audioTrackController.audioTracks : [];
}
/**
* index of the selected audio track (index in audio track lists)
* @type {number}
*/
get audioTrack () {
const audioTrackController = this.audioTrackController;
return audioTrackController ? audioTrackController.audioTrack : -1;
}
/**
* selects an audio track, based on its index in audio track lists
* @type {number}
*/
set audioTrack (audioTrackId) {
const audioTrackController = this.audioTrackController;
if (audioTrackController)
audioTrackController.audioTrack = audioTrackId;
}
/**
* @type {Seconds}
*/
get liveSyncPosition () {
return this.streamController.liveSyncPosition;
}
/**
* get alternate subtitle tracks list from playlist
* @type {SubtitleTrack[]}
*/
get subtitleTracks () {
const subtitleTrackController = this.subtitleTrackController;
return subtitleTrackController ? subtitleTrackController.subtitleTracks : [];
}
/**
* index of the selected subtitle track (index in subtitle track lists)
* @type {number}
*/
get subtitleTrack () {
const subtitleTrackController = this.subtitleTrackController;
return subtitleTrackController ? subtitleTrackController.subtitleTrack : -1;
}
/**
* select an subtitle track, based on its index in subtitle track lists
* @type{number}
*/
set subtitleTrack (subtitleTrackId) {
const subtitleTrackController = this.subtitleTrackController;
if (subtitleTrackController)
subtitleTrackController.subtitleTrack = subtitleTrackId;
}
/**
* @type {booelan}
*/
get subtitleDisplay () {
const subtitleTrackController = this.subtitleTrackController;
return subtitleTrackController ? subtitleTrackController.subtitleDisplay : false;
}
/**
* Enable/disable subtitle display rendering
* @type {boolean}
*/
set subtitleDisplay (value) {
const subtitleTrackController = this.subtitleTrackController;
if (subtitleTrackController)
subtitleTrackController.subtitleDisplay = value;
}
}
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