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Fix #1017, fix #980, fix #1014: Captions rewrite (use index internally)

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Albin Larsson
2018-06-08 14:49:35 +02:00
parent 1fab4919c0
commit c83487a293
5 changed files with 163 additions and 141 deletions
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174
src/js/captions.js
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@ -69,12 +69,18 @@ const captions = {
({ active } = this.config.captions);
}
// Set toggled state
this.toggleCaptions(active);
// Get language from storage, fallback to config
let language = this.storage.get('language') || this.config.captions.language;
if (language === 'auto') {
[ language ] = (navigator.language || navigator.userLanguage).split('-');
}
// Set language and show if active
captions.setLanguage.call(this, language, active);
// Watch changes to textTracks and update captions menu
if (this.config.captions.update) {
utils.on(this.media.textTracks, 'addtrack removetrack', captions.update.bind(this));
if (this.isHTML5) {
const trackEvents = this.config.captions.update ? 'addtrack removetrack' : 'removetrack';
utils.on(this.media.textTracks, trackEvents, captions.update.bind(this));
}
// Update available languages in list next tick (the event must not be triggered before the listeners)
@ -82,21 +88,39 @@ const captions = {
},
update() {
// Update tracks
const tracks = captions.getTracks.call(this);
this.options.captions = tracks.map(({language}) => language);
const tracks = captions.getTracks.call(this, true);
// Get the wanted language
const { language, meta } = this.captions;
// Set language if it hasn't been set already
if (!this.language) {
let { language } = this.config.captions;
if (language === 'auto') {
[ language ] = (navigator.language || navigator.userLanguage).split('-');
}
this.language = this.storage.get('language') || (language || '').toLowerCase();
// Handle tracks (add event listener and "pseudo"-default)
if (this.isHTML5 && this.isVideo) {
tracks
.filter(track => !meta.get(track))
.forEach(track => {
this.debug.log('Track added', track);
// Attempt to store if the original dom element was "default"
meta.set(track, {
default: track.mode === 'showing',
});
// Turn off native caption rendering to avoid double captions
track.mode = 'hidden';
// Add event listener for cue changes
utils.on(track, 'cuechange', () => captions.updateCues.call(this));
});
}
// Toggle the class hooks
utils.toggleClass(this.elements.container, this.config.classNames.captions.enabled, !utils.is.empty(captions.getTracks.call(this)));
const trackRemoved = !tracks.find(track => track === this.captions.currentTrackNode);
const firstMatch = this.language !== language && tracks.find(track => track.language === language);
// Update language if removed or first matching track added
if (trackRemoved || firstMatch) {
captions.setLanguage.call(this, language, this.config.captions.active);
}
// Enable or disable captions based on track length
utils.toggleClass(this.elements.container, this.config.classNames.captions.enabled, !utils.is.empty(tracks));
// Update available languages in list
if ((this.config.controls || []).includes('settings') && this.config.settings.includes('captions')) {
@ -104,60 +128,94 @@ const captions = {
}
},
// Set the captions language
setLanguage() {
// Setup HTML5 track rendering
set(index, setLanguage = true, show = true) {
const tracks = captions.getTracks.call(this);
// Disable captions if setting to -1
if (index === -1) {
this.toggleCaptions(false);
return;
}
if (!utils.is.number(index)) {
this.debug.warn('Invalid caption argument', index);
return;
}
if (!(index in tracks)) {
this.debug.warn('Track not found', index);
return;
}
if (this.captions.currentTrack !== index) {
this.captions.currentTrack = index;
const track = captions.getCurrentTrack.call(this);
const { language } = track || {};
// Store reference to node for invalidation on remove
this.captions.currentTrackNode = track;
// Prevent setting language in some cases, since it can violate user's intentions
if (setLanguage) {
this.captions.language = language;
}
// Handle Vimeo captions
if (this.isVimeo) {
this.embed.enableTextTrack(language);
}
// Trigger event
utils.dispatchEvent.call(this, this.media, 'languagechange');
}
if (this.isHTML5 && this.isVideo) {
captions.getTracks.call(this).forEach(track => {
// Show track
utils.on(track, 'cuechange', () => captions.updateCues.call(this));
// Turn off native caption rendering to avoid double captions
// eslint-disable-next-line
track.mode = 'hidden';
});
// If we change the active track while a cue is already displayed we need to update it
captions.updateCues.call(this);
}
} else if (this.isVimeo && this.captions.active) {
this.embed.enableTextTrack(this.language);
// Show captions
if (show) {
this.toggleCaptions(true);
}
},
// Get the tracks
getTracks() {
setLanguage(language, show = true) {
if (!utils.is.string(language)) {
this.debug.warn('Invalid language argument', language);
return;
}
// Normalize
this.captions.language = language.toLowerCase();
// Set currentTrack
const tracks = captions.getTracks.call(this);
const track = captions.getCurrentTrack.call(this, true);
captions.set.call(this, tracks.indexOf(track), false, show);
},
// Get current valid caption tracks
// If update is false it will also ignore tracks without metadata
// This is used to "freeze" the language options when captions.update is false
getTracks(update = false) {
// Handle media or textTracks missing or null
const { textTracks } = this.media || {};
// Filter out invalid tracks kinds (like metadata)
return Array.from(textTracks || []).filter(track => [
'captions',
'subtitles',
].includes(track.kind));
const tracks = Array.from((this.media || {}).textTracks || []);
// For HTML5, use cache instead of current tracks when it exists (if captions.update is false)
// Filter out removed tracks and tracks that aren't captions/subtitles (for example metadata)
return tracks
.filter(track => !this.isHTML5 || update || this.captions.meta.has(track))
.filter(track => [
'captions',
'subtitles',
].includes(track.kind));
},
// Get the current track for the current language
getCurrentTrack() {
getCurrentTrack(fromLanguage = false) {
const tracks = captions.getTracks.call(this);
if (!tracks.length) {
return null;
}
// Get track based on current language
let track = tracks.find(track => track.language.toLowerCase() === this.language);
// Get the <track> with default attribute
if (!track) {
track = utils.getElement.call(this, 'track[default]');
}
// Get the first track
if (!track) {
[track] = tracks;
}
return track;
const sortIsDefault = track => Number((this.captions.meta.get(track) || {}).default);
const sorted = Array.from(tracks).sort((a, b) => sortIsDefault(b) - sortIsDefault(a));
return (!fromLanguage && tracks[this.currentTrack]) || sorted.find(track => track.language === this.captions.language) || sorted[0];
},
// Get UI label for track