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* 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.js';
import FactoryMaker from '../../core/FactoryMaker.js';
import TextSourceBuffer from './TextSourceBuffer.js';
import TextTracks from './TextTracks.js';
import VTTParser from '../utils/VTTParser.js';
import VttCustomRenderingParser from '../utils/VttCustomRenderingParser.js';
import TTMLParser from '../utils/TTMLParser.js';
import EventBus from '../../core/EventBus.js';
import Debug from '../../core/Debug.js';
import Events from '../../core/events/Events.js';
import MediaPlayerEvents from '../../streaming/MediaPlayerEvents.js';
import {checkParameterType} from '../utils/SupervisorTools.js';
import DVBFonts from './DVBFonts.js';
import DashConstants from '../../dash/constants/DashConstants.js';
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);
eventBus.on(Events.MEDIAINFO_UPDATED, _onMediaInfoUpdated, instance);
eventBus.on(Events.PLAYBACK_TIME_UPDATED, _onPlaybackTimeUpdated, instance);
Iif (settings.get().streaming.text.webvtt.customRenderingEnabled) {
eventBus.on(Events.PLAYBACK_SEEKING, _onPlaybackSeeking, instance);
}
eventBus.on(Events.PLAYBACK_SEEKED, _onPlaybackSeeked, 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;
Iif (!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;
Iif (!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;
Iif ((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);
Iif (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;
const tracks = textTracks[streamId];
if (!tracks || isNaN(e.time)) {
return;
}
tracks.updateTextTrackWindow(e.time);
if (settings.get().streaming.text.webvtt.customRenderingEnabled) {
tracks.manualCueProcessing(e.time);
}
} catch (err) {
}
}
function _onPlaybackSeeking(e) {
try {
const streamId = e.streamId;
if (!textTracks[streamId]) {
return;
}
textTracks[streamId].disableManualTracks();
} catch (e) {
}
}
function _onPlaybackSeeked(e) {
try {
const tracks = textTracks[e.streamId];
if (!tracks) {
return;
}
const currentTime = videoModel.getTime() || 0;
tracks.updateTextTrackWindow(currentTime, true);
} catch (e) {
logger.error(e);
}
}
function _onMediaInfoUpdated(e) {
try {
if (!e || !e.mediaType || e.mediaType !== Constants.AUDIO || !e.currentMediaInfo) {
return
}
const currentTextTrackInfo = textTracks[e.streamId].getCurrentTextTrackInfo();
let suitableForcedSubtitleIndex = NaN;
if (allTracksAreDisabled) {
suitableForcedSubtitleIndex = _getSuitableForceSubtitleTrackIndex(e.streamId);
} else if (_isForcedSubtitleTrack(currentTextTrackInfo) && e.currentMediaInfo.lang && e.currentMediaInfo.lang !== currentTextTrackInfo.lang) {
suitableForcedSubtitleIndex = _getSuitableForceSubtitleTrackIndex(e.streamId);
if (isNaN(suitableForcedSubtitleIndex)) {
suitableForcedSubtitleIndex = -1;
}
}
if (!isNaN(suitableForcedSubtitleIndex)) {
setTextTrack(e.streamId, suitableForcedSubtitleIndex);
}
} catch (e) {
logger.error(e);
}
}
function enableText(streamId, enable) {
checkParameterType(enable, 'boolean');
Iif (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;
Iif (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
Iif (oldTrackIdx === idx || !textTracks[streamId]) {
return;
}
textTracks[streamId].disableManualTracks();
textTracks[streamId].invalidateCueWindow();
let currentTrackInfo = textTracks[streamId].getCurrentTextTrackInfo();
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].getCurrentTextTrackInfo();
const dispatchForManualRendering = settings.get().streaming.text.dispatchForManualRendering;
if (currentTrackInfo && !dispatchForManualRendering && (currentTrackInfo.mode !== Constants.TEXT_DISABLED)) {
textTracks[streamId].setModeForTrackIdx(idx, Constants.TEXT_SHOWING);
}
Iif (currentTrackInfo && currentTrackInfo.isFragmented && !currentTrackInfo.isEmbedded) {
_setFragmentedTextTrack(streamId, currentTrackInfo, oldTrackIdx);
} else if (currentTrackInfo && !currentTrackInfo.isFragmented) {
_setNonFragmentedTextTrack(streamId, currentTrackInfo);
} else if (!currentTrackInfo && allTracksAreDisabled) {
const forcedSubtitleTrackIndex = _getSuitableForceSubtitleTrackIndex(streamId)
Iif (!isNaN(forcedSubtitleTrackIndex)) {
setTextTrack(streamId, forcedSubtitleTrackIndex);
}
return
}
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 _getSuitableForceSubtitleTrackIndex(streamId) {
const forcedSubtitleTracks = _getForcedSubtitleTracks(streamId);
if (!forcedSubtitleTracks || forcedSubtitleTracks.length <= 0) {
return NaN
}
const currentAudioTrack = mediaController.getCurrentTrackFor(Constants.AUDIO, streamId);
if (!currentAudioTrack) {
return NaN
}
const suitableTrack = forcedSubtitleTracks.find((track) => {
return currentAudioTrack.lang === track.lang
})
if (suitableTrack) {
return suitableTrack._indexToSelect
}
return NaN
}
function _getForcedSubtitleTracks(streamId) {
const textTrackInfos = textTracks[streamId].getTextTrackInfos();
return textTrackInfos.filter((textTrackInfo, index) => {
textTrackInfo._indexToSelect = index;
Iif (textTrackInfo && textTrackInfo.roles && textTrackInfo.roles.length > 0) {
return _isForcedSubtitleTrack(textTrackInfo);
}
return false
});
}
function _isForcedSubtitleTrack(textTrackInfo) {
if (!textTrackInfo || !textTrackInfo.roles || textTrackInfo.roles.length === 0) {
return false
}
return textTrackInfo.roles.some((role) => {
return role.schemeIdUri === Constants.DASH_ROLE_SCHEME_ID && role.value === DashConstants.FORCED_SUBTITLE
})
}
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 clearDataForStream(streamId) {
if (textSourceBuffers[streamId]) {
textSourceBuffers[streamId].resetEmbedded();
textSourceBuffers[streamId].reset();
delete textSourceBuffers[streamId];
}
if (textTracks[streamId]) {
textTracks[streamId].deleteAllTextTracks();
delete textTracks[streamId];
}
if (streamData[streamId]) {
delete streamData[streamId];
}
}
function resetInitialSettings() {
textSourceBuffers = {};
textTracks = {};
streamData = {};
allTracksAreDisabled = true;
textTracksAdded = false;
disableTextBeforeTextTracksAdded = false;
}
function reset() {
Object.keys(textSourceBuffers).forEach((key) => {
textSourceBuffers[key].resetEmbedded();
textSourceBuffers[key].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);
eventBus.off(Events.MEDIAINFO_UPDATED, _onMediaInfoUpdated, instance);
eventBus.off(Events.PLAYBACK_TIME_UPDATED, _onPlaybackTimeUpdated, instance);
Iif (settings.get().streaming.text.webvtt.customRenderingEnabled) {
eventBus.off(Events.PLAYBACK_SEEKING, _onPlaybackSeeking, instance);
}
eventBus.off(Events.PLAYBACK_SEEKED, _onPlaybackSeeked, instance);
}
instance = {
addEmbeddedTrack,
addMediaInfosToBuffer,
createTracks,
deactivateStream,
enableForcedTextStreaming,
enableText,
getAllTracksAreDisabled,
getCurrentTrackIdx,
getTextSourceBuffer,
initialize,
initializeForStream,
isTextEnabled,
reset,
setTextTrack,
clearDataForStream,
};
setup();
return instance;
}
TextController.__dashjs_factory_name = 'TextController';
export default FactoryMaker.getClassFactory(TextController);
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