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// ==========================================================================
// Plyr Captions
// TODO: Create as class
// ==========================================================================
import support from './support';
import utils from './utils';
import controls from './controls';
import i18n from './i18n';
const captions = {
// Setup captions
setup() {
// Requires UI support
if (!this.supported.ui) {
return;
}
// Set default language if not set
const stored = this.storage.get('language');
if (!utils.is.empty(stored)) {
this.captions.language = stored;
}
if (utils.is.empty(this.captions.language)) {
this.captions.language = this.config.captions.language.toLowerCase();
}
// Set captions enabled state if not set
if (!utils.is.boolean(this.captions.active)) {
const active = this.storage.get('captions');
if (utils.is.boolean(active)) {
this.captions.active = active;
} else {
this.captions.active = this.config.captions.active;
}
}
// Only Vimeo and HTML5 video supported at this point
if (!this.isVideo || this.isYouTube || (this.isHTML5 && !support.textTracks)) {
// Clear menu and hide
if (utils.is.array(this.config.controls) && this.config.controls.includes('settings') && this.config.settings.includes('captions')) {
controls.setCaptionsMenu.call(this);
}
return;
}
// Inject the container
if (!utils.is.element(this.elements.captions)) {
this.elements.captions = utils.createElement('div', utils.getAttributesFromSelector(this.config.selectors.captions));
utils.insertAfter(this.elements.captions, this.elements.wrapper);
}
// Set the class hook
utils.toggleClass(this.elements.container, this.config.classNames.captions.enabled, !utils.is.empty(captions.getTracks.call(this)));
// Get tracks
const tracks = captions.getTracks.call(this);
// If no caption file exists, hide container for caption text
if (utils.is.empty(tracks)) {
return;
}
// Get browser info
const browser = utils.getBrowser();
// Fix IE captions if CORS is used
// Fetch captions and inject as blobs instead (data URIs not supported!)
if (browser.isIE && window.URL) {
const elements = this.media.querySelectorAll('track');
Array.from(elements).forEach(track => {
const src = track.getAttribute('src');
const href = utils.parseUrl(src);
if (href.hostname !== window.location.href.hostname && [
'http:',
'https:',
].includes(href.protocol)) {
utils
.fetch(src, 'blob')
.then(blob => {
track.setAttribute('src', window.URL.createObjectURL(blob));
})
.catch(() => {
utils.removeElement(track);
});
}
});
}
// Set language
captions.setLanguage.call(this);
// Enable UI
captions.show.call(this);
// Set available languages in list
if (utils.is.array(this.config.controls) && this.config.controls.includes('settings') && this.config.settings.includes('captions')) {
controls.setCaptionsMenu.call(this);
}
},
// Set the captions language
setLanguage() {
// Setup HTML5 track rendering
if (this.isHTML5 && this.isVideo) {
captions.getTracks.call(this).forEach(track => {
// Show track
utils.on(track, 'cuechange', event => captions.setCue.call(this, event));
// Turn off native caption rendering to avoid double captions
// eslint-disable-next-line
track.mode = 'hidden';
});
// Get current track
const currentTrack = captions.getCurrentTrack.call(this);
// Check if suported kind
if (utils.is.track(currentTrack)) {
// If we change the active track while a cue is already displayed we need to update it
if (Array.from(currentTrack.activeCues || []).length) {
captions.setCue.call(this, currentTrack);
}
}
} else if (this.isVimeo && this.captions.active) {
this.embed.enableTextTrack(this.language);
}
},
// Get the tracks
getTracks() {
// Return empty array at least
if (utils.is.nullOrUndefined(this.media)) {
return [];
}
// Only get accepted kinds
return Array.from(this.media.textTracks || []).filter(track => [
'captions',
'subtitles',
].includes(track.kind));
},
// Get the current track for the current language
getCurrentTrack() {
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;
},
// Get UI label for track
getLabel(track) {
let currentTrack = track;
if (!utils.is.track(currentTrack) && support.textTracks && this.captions.active) {
currentTrack = captions.getCurrentTrack.call(this);
}
if (utils.is.track(currentTrack)) {
if (!utils.is.empty(currentTrack.label)) {
return currentTrack.label;
}
if (!utils.is.empty(currentTrack.language)) {
return track.language.toUpperCase();
}
return i18n.get('enabled', this.config);
}
return i18n.get('disabled', this.config);
},
// Display active caption if it contains text
setCue(input) {
// Get the track from the event if needed
const track = utils.is.event(input) ? input.target : input;
const { activeCues } = track;
const active = activeCues.length && activeCues[0];
const currentTrack = captions.getCurrentTrack.call(this);
// Only display current track
if (track !== currentTrack) {
return;
}
// Display a cue, if there is one
if (utils.is.cue(active)) {
captions.setText.call(this, active.getCueAsHTML());
} else {
captions.setText.call(this, null);
}
utils.dispatchEvent.call(this, this.media, 'cuechange');
},
// Set the current caption
setText(input) {
// Requires UI
if (!this.supported.ui) {
return;
}
if (utils.is.element(this.elements.captions)) {
const content = utils.createElement('span');
// Empty the container
utils.emptyElement(this.elements.captions);
// Default to empty
const caption = !utils.is.nullOrUndefined(input) ? input : '';
// Set the span content
if (utils.is.string(caption)) {
content.textContent = caption.trim();
} else {
content.appendChild(caption);
}
// Set new caption text
this.elements.captions.appendChild(content);
} else {
this.debug.warn('No captions element to render to');
}
},
// Display captions container and button (for initialization)
show() {
// Try to load the value from storage
let active = this.storage.get('captions');
// Otherwise fall back to the default config
if (!utils.is.boolean(active)) {
({ active } = this.config.captions);
} else {
this.captions.active = active;
}
if (active) {
utils.toggleClass(this.elements.container, this.config.classNames.captions.active, true);
utils.toggleState(this.elements.buttons.captions, true);
}
},
};
export default captions;
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