dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="https://dashif.org/img/favicon.ico"><link type="text/css" rel="stylesheet" href="jsdoc-custom.css"><title>Source: streaming/text/TextController.js</title><!--[if lt IE 9]>
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href="MediaPlayerEvents.html#event:BUFFER_LEVEL_UPDATED">BUFFER_LEVEL_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:BUFFER_LOADED">BUFFER_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAN_PLAY">CAN_PLAY</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAN_PLAY_THROUGH">CAN_PLAY_THROUGH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAPTION_CONTAINER_RESIZE">CAPTION_CONTAINER_RESIZE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAPTION_RENDERED">CAPTION_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CONFORMANCE_VIOLATION">CONFORMANCE_VIOLATION</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CONTENT_STEERING_REQUEST_COMPLETED">CONTENT_STEERING_REQUEST_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CUE_ENTER">CUE_ENTER</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CUE_ENTER">CUE_ENTER</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_ADDED">DVB_FONT_DOWNLOAD_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_COMPLETE">DVB_FONT_DOWNLOAD_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_FAILED">DVB_FONT_DOWNLOAD_FAILED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DYNAMIC_TO_STATIC">DYNAMIC_TO_STATIC</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:ERROR">ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:EVENT_MODE_ON_RECEIVE">EVENT_MODE_ON_RECEIVE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:EVENT_MODE_ON_START">EVENT_MODE_ON_START</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_ABANDONED">FRAGMENT_LOADING_ABANDONED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_COMPLETED">FRAGMENT_LOADING_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_PROGRESS">FRAGMENT_LOADING_PROGRESS</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_STARTED">FRAGMENT_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:INBAND_PRFT">INBAND_PRFT</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:LOG">LOG</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADED">MANIFEST_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_FINISHED">MANIFEST_LOADING_FINISHED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_STARTED">MANIFEST_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_VALIDITY_CHANGED">MANIFEST_VALIDITY_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_ADDED">METRIC_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_CHANGED">METRIC_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_UPDATED">METRIC_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRICS_CHANGED">METRICS_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_COMPLETED">PERIOD_SWITCH_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_STARTED">PERIOD_SWITCH_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ENDED">PLAYBACK_ENDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ERROR">PLAYBACK_ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_LOADED_DATA">PLAYBACK_LOADED_DATA</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_METADATA_LOADED">PLAYBACK_METADATA_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_NOT_ALLOWED">PLAYBACK_NOT_ALLOWED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PAUSED">PLAYBACK_PAUSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PLAYING">PLAYBACK_PLAYING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PROGRESS">PLAYBACK_PROGRESS</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_RATE_CHANGED">PLAYBACK_RATE_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_SEEKED">PLAYBACK_SEEKED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_SEEKING">PLAYBACK_SEEKING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_STALLED">PLAYBACK_STALLED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_STARTED">PLAYBACK_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_TIME_UPDATED">PLAYBACK_TIME_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_VOLUME_CHANGED">PLAYBACK_VOLUME_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_WAITING">PLAYBACK_WAITING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_RENDERED">QUALITY_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_REQUESTED">QUALITY_CHANGE_REQUESTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:REPRESENTATION_SWITCH">REPRESENTATION_SWITCH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_ACTIVATED">STREAM_ACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_DEACTIVATED">STREAM_DEACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZED">STREAM_INITIALIZED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZING">STREAM_INITIALIZING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_TEARDOWN_COMPLETE">STREAM_TEARDOWN_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_UPDATED">STREAM_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACK_ADDED">TEXT_TRACK_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACKS_ADDED">TEXT_TRACKS_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:THROUGHPUT_MEASUREMENT_STORED">THROUGHPUT_MEASUREMENT_STORED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TRACK_CHANGE_RENDERED">TRACK_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_PARSED">TTML_PARSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_TO_PARSE">TTML_TO_PARSE</a></div><div class="sidebar-section-children"><a href="MetricsReportingEvents.html#event:CMCD_DATA_GENERATED">CMCD_DATA_GENERATED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_FINISHED">OFFLINE_RECORD_FINISHED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_LOADEDMETADATA">OFFLINE_RECORD_LOADEDMETADATA</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STARTED">OFFLINE_RECORD_STARTED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STOPPED">OFFLINE_RECORD_STOPPED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_ADDED">KEY_ADDED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_ERROR">KEY_ERROR</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_MESSAGE">KEY_MESSAGE</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SESSION_CLOSED">KEY_SESSION_CLOSED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SESSION_CREATED">KEY_SESSION_CREATED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SESSION_REMOVED">KEY_SESSION_REMOVED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_STATUSES_CHANGED">KEY_STATUSES_CHANGED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SYSTEM_ACCESS_COMPLETE">KEY_SYSTEM_ACCESS_COMPLETE</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SYSTEM_SELECTED">KEY_SYSTEM_SELECTED</a></div><div 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class="has-anchor">streaming_text_TextController.js</h1></header><article><pre class="prettyprint source lang-js"><code>/**
* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
import Constants from '../constants/Constants';
import FactoryMaker from '../../core/FactoryMaker';
import TextSourceBuffer from './TextSourceBuffer';
import TextTracks from './TextTracks';
import VTTParser from '../utils/VTTParser';
import VttCustomRenderingParser from '../utils/VttCustomRenderingParser';
import TTMLParser from '../utils/TTMLParser';
import Debug from '../../core/Debug';
import EventBus from '../../core/EventBus';
import Events from '../../core/events/Events';
import MediaPlayerEvents from '../../streaming/MediaPlayerEvents';
import {checkParameterType} from '../utils/SupervisorTools';
import DVBFonts from './DVBFonts';
function TextController(config) {
let context = this.context;
const adapter = config.adapter;
const errHandler = config.errHandler;
const manifestModel = config.manifestModel;
const mediaController = config.mediaController;
const baseURLController = config.baseURLController;
const videoModel = config.videoModel;
const settings = config.settings;
let instance,
streamData,
textSourceBuffers,
textTracks,
vttParser,
vttCustomRenderingParser,
ttmlParser,
eventBus,
allTracksAreDisabled,
forceTextStreaming,
textTracksAdded,
disableTextBeforeTextTracksAdded,
dvbFonts,
logger;
function setup() {
forceTextStreaming = false;
textTracksAdded = false;
disableTextBeforeTextTracksAdded = false;
vttParser = VTTParser(context).getInstance();
vttCustomRenderingParser = VttCustomRenderingParser(context).getInstance();
ttmlParser = TTMLParser(context).getInstance();
eventBus = EventBus(context).getInstance();
logger = Debug(context).getInstance().getLogger(instance);
resetInitialSettings();
}
function initialize() {
dvbFonts = DVBFonts(context).create({
adapter,
baseURLController,
});
eventBus.on(Events.TEXT_TRACKS_QUEUE_INITIALIZED, _onTextTracksAdded, instance);
eventBus.on(Events.DVB_FONT_DOWNLOAD_FAILED, _onFontDownloadFailure, instance);
eventBus.on(Events.DVB_FONT_DOWNLOAD_COMPLETE, _onFontDownloadSuccess, instance);
if (settings.get().streaming.text.webvtt.customRenderingEnabled) {
eventBus.on(Events.PLAYBACK_TIME_UPDATED, _onPlaybackTimeUpdated, instance);
eventBus.on(Events.PLAYBACK_SEEKING, _onPlaybackSeeking, instance);
}
}
function initializeForStream(streamInfo) {
const streamId = streamInfo.id;
const tracks = TextTracks(context).create({
videoModel,
settings,
streamInfo
});
tracks.initialize();
textTracks[streamId] = tracks;
const textSourceBuffer = TextSourceBuffer(context).create({
errHandler,
adapter,
dvbFonts,
manifestModel,
mediaController,
videoModel,
textTracks: tracks,
vttParser,
vttCustomRenderingParser,
ttmlParser,
streamInfo,
settings
});
textSourceBuffer.initialize();
textSourceBuffers[streamId] = textSourceBuffer;
streamData[streamId] = {};
streamData[streamId].lastEnabledIndex = -1;
}
/**
* All media infos have been added. Start creating the track objects
* @param {object} streamInfo
*/
function createTracks(streamInfo) {
const streamId = streamInfo.id;
if (!textTracks[streamId]) {
return;
}
textTracks[streamId].createTracks();
}
/**
* Adds the new mediaInfo objects to the textSourceBuffer.
* @param {object} streamInfo
* @param {array} mInfos
* @param {string|null} mimeType
* @param {object} fragmentModel
*/
function addMediaInfosToBuffer(streamInfo, type, mInfos, fragmentModel = null) {
const streamId = streamInfo.id;
if (!textSourceBuffers[streamId]) {
return;
}
textSourceBuffers[streamId].addMediaInfos(type, mInfos, fragmentModel);
}
function getTextSourceBuffer(streamInfo) {
const streamId = streamInfo.id;
if (textSourceBuffers && textSourceBuffers[streamId]) {
return textSourceBuffers[streamId];
}
}
function getAllTracksAreDisabled() {
return allTracksAreDisabled;
}
function addEmbeddedTrack(streamInfo, mediaInfo) {
const streamId = streamInfo.id;
if (!textSourceBuffers[streamId]) {
return;
}
textSourceBuffers[streamId].addEmbeddedTrack(mediaInfo);
}
/**
* Event that is triggered if a font download of a font described in an essential property descriptor
* tag fails.
* @param {FontInfo} font - font information
* @private
*/
function _onFontDownloadFailure(font) {
logger.error(`Could not download ${font.isEssential ? 'an essential' : 'a'} font - fontFamily: ${font.fontFamily}, url: ${font.url}`);
if (font.isEssential) {
let idx = textTracks[font.streamId].getTrackIdxForId(font.trackId);
textTracks[font.streamId].setModeForTrackIdx(idx, Constants.TEXT_DISABLED);
}
};
/**
* Set a font with an essential property
* @private
*/
function _onFontDownloadSuccess(font) {
logger.debug(`Successfully downloaded ${font.isEssential ? 'an essential' : 'a'} font - fontFamily: ${font.fontFamily}, url: ${font.url}`);
if (font.isEssential) {
let idx = textTracks[font.streamId].getTrackIdxForId(font.trackId);
if (idx === textTracks[font.streamId].getCurrentTrackIdx()) {
textTracks[font.streamId].setModeForTrackIdx(idx, Constants.TEXT_SHOWING);
} else {
textTracks[font.streamId].setModeForTrackIdx(idx, Constants.TEXT_HIDDEN);
}
}
}
function _onTextTracksAdded(e) {
let tracks = e.tracks;
let index = e.index;
const streamId = e.streamId;
const textDefaultEnabled = settings.get().streaming.text.defaultEnabled;
if ((textDefaultEnabled === false && !isTextEnabled()) || disableTextBeforeTextTracksAdded) {
// disable text at startup if explicitly configured with setTextDefaultEnabled(false) or if there is no defaultSettings (configuration or from domStorage)
setTextTrack(streamId, -1);
} else {
const currentTrack = mediaController.getCurrentTrackFor(Constants.TEXT, streamId);
if (currentTrack) {
const defaultSettings = {
lang: currentTrack.lang,
role: currentTrack.roles[0],
index: currentTrack.index,
codec: currentTrack.codec,
accessibility: currentTrack.accessibility[0]
};
tracks.some((item, idx) => {
// matchSettings is compatible with setTextDefaultLanguage and setInitialSettings
if (mediaController.matchSettings(defaultSettings, item)) {
setTextTrack(streamId, idx);
index = idx;
return true;
}
});
}
allTracksAreDisabled = false;
}
streamData[streamId].lastEnabledIndex = index;
eventBus.trigger(MediaPlayerEvents.TEXT_TRACKS_ADDED, {
enabled: isTextEnabled(),
index: index,
tracks: tracks,
streamId
});
textTracksAdded = true;
dvbFonts.addFontsFromTracks(tracks, streamId);
// Initially disable any tracks with essential property font downloads
dvbFonts.getFonts().forEach(font => {
if (font.isEssential) {
let idx = textTracks[font.streamId].getTrackIdxForId(font.trackId);
textTracks[font.streamId].setModeForTrackIdx(idx, Constants.TEXT_DISABLED);
}
});
dvbFonts.downloadFonts();
}
function _onPlaybackTimeUpdated(e) {
try {
const streamId = e.streamId;
if (!textTracks[streamId] || isNaN(e.time)) {
return;
}
textTracks[streamId].manualCueProcessing(e.time);
} catch (err) {
}
}
function _onPlaybackSeeking(e) {
try {
const streamId = e.streamId;
if (!textTracks[streamId]) {
return;
}
textTracks[streamId].disableManualTracks();
} catch (e) {
}
}
function enableText(streamId, enable) {
checkParameterType(enable, 'boolean');
if (isTextEnabled() !== enable) {
// change track selection
if (enable) {
// apply last enabled track
setTextTrack(streamId, streamData[streamId].lastEnabledIndex);
}
if (!enable) {
// keep last index and disable text track
streamData[streamId].lastEnabledIndex = getCurrentTrackIdx(streamId);
if (!textTracksAdded) {
disableTextBeforeTextTracksAdded = true;
} else {
setTextTrack(streamId, -1);
}
}
}
return true
}
function isTextEnabled() {
let enabled = true;
if (allTracksAreDisabled && !forceTextStreaming) {
enabled = false;
}
return enabled;
}
// when set to true ScheduleController will allow schedule of chunks even if tracks are all disabled. Allowing streaming to hidden track for external players to work with.
function enableForcedTextStreaming(enable) {
checkParameterType(enable, 'boolean');
forceTextStreaming = enable;
return true
}
function setTextTrack(streamId, idx) {
// For external time text file, the only action needed to change a track is marking the track mode to showing.
// Fragmented text tracks need the additional step of calling TextController.setTextTrack();
allTracksAreDisabled = idx === -1;
if (allTracksAreDisabled && mediaController) {
mediaController.saveTextSettingsDisabled();
}
let oldTrackIdx = getCurrentTrackIdx(streamId);
// No change, no action required
if (oldTrackIdx === idx || !textTracks[streamId]) {
return;
}
textTracks[streamId].disableManualTracks();
let currentTrackInfo = textTracks[streamId].getCurrentTrackInfo();
let currentNativeTrackInfo = (currentTrackInfo) ? videoModel.getTextTrack(currentTrackInfo.kind, currentTrackInfo.id, currentTrackInfo.lang, currentTrackInfo.isTTML, currentTrackInfo.isEmbedded) : null;
// Don't change disabled tracks - dvb font download for essential property failed or not complete
if (currentNativeTrackInfo && (currentNativeTrackInfo.mode !== Constants.TEXT_DISABLED)) {
textTracks[streamId].setModeForTrackIdx(oldTrackIdx, Constants.TEXT_HIDDEN);
}
textTracks[streamId].setCurrentTrackIdx(idx);
currentTrackInfo = textTracks[streamId].getCurrentTrackInfo();
const dispatchForManualRendering = settings.get().streaming.text.dispatchForManualRendering;
if (currentTrackInfo && !dispatchForManualRendering && (currentTrackInfo.mode !== Constants.TEXT_DISABLED)) {
textTracks[streamId].setModeForTrackIdx(idx, Constants.TEXT_SHOWING);
}
if (currentTrackInfo && currentTrackInfo.isFragmented && !currentTrackInfo.isEmbedded) {
_setFragmentedTextTrack(streamId, currentTrackInfo, oldTrackIdx);
} else if (currentTrackInfo && !currentTrackInfo.isFragmented) {
_setNonFragmentedTextTrack(streamId, currentTrackInfo);
}
mediaController.setTrack(currentTrackInfo);
}
function _setFragmentedTextTrack(streamId, currentTrackInfo, oldTrackIdx) {
if (!textSourceBuffers[streamId]) {
return;
}
let config = textSourceBuffers[streamId].getConfig();
let fragmentedTracks = config.fragmentedTracks;
for (let i = 0; i < fragmentedTracks.length; i++) {
let mediaInfo = fragmentedTracks[i];
if (currentTrackInfo.lang === mediaInfo.lang &&
(mediaInfo.id ? currentTrackInfo.id === mediaInfo.id : currentTrackInfo.index === mediaInfo.index)) {
let currentFragTrack = mediaController.getCurrentTrackFor(Constants.TEXT, streamId);
if (mediaInfo.id ? currentFragTrack.id !== mediaInfo.id : currentFragTrack.index !== mediaInfo.index) {
textTracks[streamId].deleteCuesFromTrackIdx(oldTrackIdx);
textSourceBuffers[streamId].setCurrentFragmentedTrackIdx(i);
} else if (oldTrackIdx === -1) {
// in fragmented use case, if the user selects the older track (the one selected before disabled text track)
// no CURRENT_TRACK_CHANGED event will be triggered because the mediaInfo in the StreamProcessor is equal to the one we are selecting
// For that reason we reactivate the StreamProcessor and the ScheduleController
eventBus.trigger(Events.SET_FRAGMENTED_TEXT_AFTER_DISABLED, {}, {
streamId,
mediaType: Constants.TEXT
});
}
}
}
}
function _setNonFragmentedTextTrack(streamId, currentTrackInfo) {
eventBus.trigger(Events.SET_NON_FRAGMENTED_TEXT, {
currentTrackInfo
}, {
streamId,
mediaType: Constants.TEXT
});
}
function getCurrentTrackIdx(streamId) {
return textTracks[streamId].getCurrentTrackIdx();
}
function deactivateStream(streamInfo) {
if (!streamInfo) {
return;
}
const streamId = streamInfo.id;
if (textSourceBuffers[streamId]) {
textSourceBuffers[streamId].resetMediaInfos();
}
if (textTracks[streamId]) {
textTracks[streamId].deleteAllTextTracks();
}
}
function resetInitialSettings() {
textSourceBuffers = {};
textTracks = {};
streamData = {};
allTracksAreDisabled = true;
textTracksAdded = false;
disableTextBeforeTextTracksAdded = false;
}
function reset() {
dvbFonts.reset();
resetInitialSettings();
eventBus.off(Events.TEXT_TRACKS_QUEUE_INITIALIZED, _onTextTracksAdded, instance);
eventBus.off(Events.DVB_FONT_DOWNLOAD_FAILED, _onFontDownloadFailure, instance);
eventBus.off(Events.DVB_FONT_DOWNLOAD_COMPLETE, _onFontDownloadSuccess, instance);
if (settings.get().streaming.text.webvtt.customRenderingEnabled) {
eventBus.off(Events.PLAYBACK_TIME_UPDATED, _onPlaybackTimeUpdated, instance);
eventBus.off(Events.PLAYBACK_SEEKING, _onPlaybackSeeking, instance)
}
Object.keys(textSourceBuffers).forEach((key) => {
textSourceBuffers[key].resetEmbedded();
textSourceBuffers[key].reset();
});
}
instance = {
deactivateStream,
initialize,
initializeForStream,
createTracks,
getTextSourceBuffer,
getAllTracksAreDisabled,
addEmbeddedTrack,
enableText,
isTextEnabled,
setTextTrack,
getCurrentTrackIdx,
enableForcedTextStreaming,
addMediaInfosToBuffer,
reset
};
setup();
return instance;
}
TextController.__dashjs_factory_name = 'TextController';
export default FactoryMaker.getClassFactory(TextController);
</code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="mobile-nav-links"></div><div 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href="MetricsReportingEvents.html#event:CMCD_DATA_GENERATED">CMCD_DATA_GENERATED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_FINISHED">OFFLINE_RECORD