dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<h1 class="page-title">Source: streaming/text/TextController.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">/**
* 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 TTMLParser from '../utils/TTMLParser';
import EventBus from '../../core/EventBus';
import Events from '../../core/events/Events';
import MediaPlayerEvents from '../../streaming/MediaPlayerEvents';
import {checkParameterType} from '../utils/SupervisorTools';
function TextController(config) {
let context = this.context;
const adapter = config.adapter;
const errHandler = config.errHandler;
const manifestModel = config.manifestModel;
const mediaController = config.mediaController;
const videoModel = config.videoModel;
const settings = config.settings;
let instance,
streamData,
textSourceBuffers,
textTracks,
vttParser,
ttmlParser,
eventBus,
defaultSettings,
initialSettingsSet,
allTracksAreDisabled,
forceTextStreaming,
textTracksAdded,
disableTextBeforeTextTracksAdded;
function setup() {
defaultSettings = null;
forceTextStreaming = false;
textTracksAdded = false;
initialSettingsSet = false;
disableTextBeforeTextTracksAdded = false;
vttParser = VTTParser(context).getInstance();
ttmlParser = TTMLParser(context).getInstance();
eventBus = EventBus(context).getInstance();
resetInitialSettings();
}
function initialize() {
eventBus.on(Events.CURRENT_TRACK_CHANGED, _onCurrentTrackChanged, instance);
eventBus.on(Events.TEXT_TRACKS_QUEUE_INITIALIZED, _onTextTracksAdded, instance);
}
function initializeForStream(streamInfo) {
const streamId = streamInfo.id;
const tracks = TextTracks(context).create({
videoModel,
streamInfo
});
tracks.initialize();
textTracks[streamId] = tracks;
const textSourceBuffer = TextSourceBuffer(context).create({
errHandler,
adapter,
manifestModel,
mediaController,
videoModel,
textTracks: tracks,
vttParser,
ttmlParser,
streamInfo
});
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);
}
function setInitialSettings(settings) {
defaultSettings = settings;
initialSettingsSet = true;
}
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 {
if (defaultSettings) {
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;
}
function _onCurrentTrackChanged(event) {
if (!initialSettingsSet && event && event.newMediaInfo) {
let mediaInfo = event.newMediaInfo;
if (mediaInfo.type === Constants.TEXT) {
defaultSettings = {
lang: mediaInfo.lang,
role: mediaInfo.roles[0],
index: mediaInfo.index,
codec: mediaInfo.codec,
accessibility: mediaInfo.accessibility[0]
};
}
}
}
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);
}
}
}
}
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;
}
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].setModeForTrackIdx(oldTrackIdx, Constants.TEXT_HIDDEN);
textTracks[streamId].setCurrentTrackIdx(idx);
textTracks[streamId].setModeForTrackIdx(idx, Constants.TEXT_SHOWING);
let currentTrackInfo = textTracks[streamId].getCurrentTrackInfo();
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() {
resetInitialSettings();
eventBus.off(Events.CURRENT_TRACK_CHANGED, _onCurrentTrackChanged, instance);
eventBus.off(Events.TEXT_TRACKS_QUEUE_INITIALIZED, _onTextTracksAdded, instance);
Object.keys(textSourceBuffers).forEach((key) => {
textSourceBuffers[key].resetEmbedded();
textSourceBuffers[key].reset();
});
}
instance = {
deactivateStream,
initialize,
initializeForStream,
createTracks,
getTextSourceBuffer,
getAllTracksAreDisabled,
addEmbeddedTrack,
setInitialSettings,
enableText,
isTextEnabled,
setTextTrack,
getCurrentTrackIdx,
enableForcedTextStreaming,
addMediaInfosToBuffer,
reset
};
setup();
return instance;
}
TextController.__dashjs_factory_name = 'TextController';
export default FactoryMaker.getClassFactory(TextController);
</pre>
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var $this = $( this );
var example = $this.find( "code" );
exampleText = example.html();
var lang = /{@lang (.*?)}/.exec( exampleText );
if ( lang && lang[1] ) {
exampleText = exampleText.replace( lang[0], "" );
example.html( exampleText );
lang = lang[1];
} else {
var langClassMatch = example.parent()[0].className.match(/lang\-(\S+)/);
lang = langClassMatch ? langClassMatch[1] : "javascript";
}
if ( lang ) {
$this
.addClass( "sunlight-highlight-" + lang )
.addClass( "linenums" )
.html( example.html() );
}
} );
Sunlight.highlightAll( {
lineNumbers : true,
showMenu : true,
enableDoclinks : true
} );
$.catchAnchorLinks( {
navbarOffset: 10
} );
$( "#toc" ).toc( {
anchorName : function ( i, heading, prefix ) {
return $( heading ).attr( "id" ) || ( prefix + i );
},
selectors : "#toc-content h1,#toc-content h2,#toc-content h3,#toc-content h4",
showAndHide : false,
smoothScrolling: true
} );
$( "#main span[id^='toc']" ).addClass( "toc-shim" );
$( '.dropdown-toggle' ).dropdown();
$( "table" ).each( function () {
var $this = $( this );
$this.addClass('table');
} );
} );
</script>
<!--Navigation and Symbol Display-->
<script>
$( function () {
$( '#main' ).localScroll( {
offset : { top : 60 } //offset by the height of your header (give or take a few px, see what works for you)
} );
$( "dt.name" ).each( function () {
var $this = $( this ).find("h4");
var icon = $( "<i/>" ).addClass( "icon-plus-sign" ).addClass( "pull-right" ).addClass( "icon-white" );
var dt = $(this);
var children = dt.next( "dd" );
dt.prepend( icon ).css( {cursor : "pointer"} );
dt.addClass( "member-collapsed" ).addClass( "member" );
children.hide();
dt.children().on( "click", function () {
children = dt.next( "dd" );
children.slideToggle( "fast", function () {
if ( children.is( ":visible" ) ) {
icon.addClass( "icon-minus-sign" ).removeClass( "icon-plus-sign" ).removeClass( "icon-white" );
dt.addClass( "member-open" ).animate( "member-collapsed" );
} else {
icon.addClass( "icon-plus-sign" ).removeClass( "icon-minus-sign" ).addClass( "icon-white" );
dt.addClass( "member-collapsed" ).removeClass( "member-open" );
}
} );
} );
} );
} );
</script>
<!--Google Analytics-->
<script type="text/javascript">
$(document).ready(function() {
SearcherDisplay.init();
});
</script>
</body>
</html>