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youtube.js
File metadata and controls
368 lines (330 loc) · 11.8 KB
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(function ($) {
AblePlayer.prototype.initYouTubePlayer = function () {
var thisObj, deferred, promise, youTubeId;
thisObj = this;
deferred = new $.Deferred();
promise = deferred.promise();
this.youTubePlayerReady = false;
// if a described version is available && user prefers desription
// init player using the described version
if (this.youTubeDescId && this.prefDesc) {
youTubeId = this.youTubeDescId;
}
else {
youTubeId = this.youTubeId;
}
this.activeYouTubeId = youTubeId;
if (AblePlayer.youTubeIframeAPIReady) {
// Script already loaded and ready.
thisObj.finalizeYoutubeInit().then(function() {
deferred.resolve();
});
}
else {
// Has another player already started loading the script? If so, abort...
if (!AblePlayer.loadingYouTubeIframeAPI) {
$.getScript('https://www.youtube.com/iframe_api').fail(function () {
deferred.fail();
});
}
// Otherwise, keeping waiting for script load event...
$('body').on('youTubeIframeAPIReady', function () {
thisObj.finalizeYoutubeInit().then(function() {
deferred.resolve();
});
});
}
return promise;
};
AblePlayer.prototype.finalizeYoutubeInit = function () {
// This is called once we're sure the Youtube iFrame API is loaded -- see above
var deferred, promise, thisObj, containerId, ccLoadPolicy, autoplay;
deferred = new $.Deferred();
promise = deferred.promise();
thisObj = this;
containerId = this.mediaId + '_youtube';
this.$mediaContainer.prepend($('<div>').attr('id', containerId));
// cc_load_policy:
// 0 - show captions depending on user's preference on YouTube
// 1 - show captions by default, even if the user has turned them off
// IMPORTANT: This *must* be set to 1 or some browsers
// fail to load any texttracks (observed in Chrome, not in Firefox)
ccLoadPolicy = 1;
if (this.okToPlay) {
autoplay = 1;
}
else {
autoplay = 0;
}
// Documentation https://developers.google.com/youtube/player_parameters
if (typeof this.captionLang == 'undefined') {
// init using the default player lang
this.captionLang = this.lang;
}
this.youTubePlayer = new YT.Player(containerId, {
videoId: this.activeYouTubeId,
host: this.youTubeNoCookie ? 'https://www.youtube-nocookie.com' : 'https://www.youtube.com',
playerVars: {
autoplay: autoplay,
enablejsapi: 1,
disableKb: 1, // disable keyboard shortcuts, using our own
playsinline: this.playsInline,
start: this.startTime,
controls: 0, // no controls, using our own
cc_load_policy: ccLoadPolicy,
cc_lang_pref: this.captionLang, // set the caption language
hl: this.lang, // set the UI language to match Able Player
modestbranding: 1, // no YouTube logo in controller
rel: 0, // when video ends, show only related videos from same channel (1 shows any)
iv_load_policy: 3 // do not show video annotations
},
events: {
onReady: function () {
thisObj.youTubePlayerReady = true;
if (!thisObj.playerWidth || !thisObj.playerHeight) {
thisObj.getYouTubeDimensions();
}
if (thisObj.playerWidth && thisObj.playerHeight) {
thisObj.youTubePlayer.setSize(thisObj.playerWidth,thisObj.playerHeight);
thisObj.$ableWrapper.css({
'width': thisObj.playerWidth + 'px'
});
}
if (thisObj.swappingSrc) {
// swap is now complete
thisObj.swappingSrc = false;
thisObj.restoreFocus();
thisObj.cueingPlaylistItem = false;
if (thisObj.playing || thisObj.okToPlay) {
// resume playing
thisObj.playMedia();
}
}
if (thisObj.userClickedPlaylist) {
thisObj.userClickedPlaylist = false; // reset
}
if (thisObj.recreatingPlayer) {
thisObj.recreatingPlayer = false; // reset
}
deferred.resolve();
},
onError: function (x) {
deferred.fail();
},
onStateChange: function (x) {
thisObj.getPlayerState().then(function(playerState) {
// values of playerState: 'playing','paused','buffering','ended'
if (playerState === 'playing') {
if (thisObj.hasSignLanguage && thisObj.signVideo) {
thisObj.signVideo.play(true);
}
thisObj.playing = true;
thisObj.startedPlaying = true;
thisObj.paused = false;
}
else if (playerState == 'ended') {
thisObj.onMediaComplete();
}
else {
thisObj.playing = false;
thisObj.paused = true;
}
if (thisObj.stoppingYouTube && playerState === 'paused') {
if (thisObj.hasSignLanguage && thisObj.signVideo) {
thisObj.signVideo.pause(true);
}
if (typeof thisObj.$posterImg !== 'undefined') {
thisObj.$posterImg.show();
}
thisObj.stoppingYouTube = false;
thisObj.seeking = false;
thisObj.playing = false;
thisObj.paused = true;
}
});
// If caption tracks are hosted locally, but are also available on YouTube,
// we need to turn them off on YouTube or there will be redundant captions
// This is the most reliable event on which to unload the caption module
if (thisObj.player === 'youtube' && !thisObj.usingYouTubeCaptions) {
if (thisObj.youTubePlayer.getOptions('captions')) {
thisObj.youTubePlayer.unloadModule('captions');
}
}
},
onApiChange: function() {
// getDuration() can be fetched during API change event.
thisObj.duration = thisObj.youTubePlayer.getDuration();
},
onPlaybackQualityChange: function () {
// do something
},
}
});
if (!this.hasPlaylist) {
// remove the media element, since YouTube replaces that with its own element in an iframe
// this is handled differently for playlists. See buildplayer.js > cuePlaylistItem()
this.$media.remove();
}
return promise;
};
AblePlayer.prototype.getYouTubeDimensions = function (youTubeContainerId) {
// The YouTube iframe API does not have a getSize() of equivalent method
// so, need to get dimensions from YouTube's iframe
var $iframe, width, height;
$iframe = this.$ableWrapper.find('iframe');
if (typeof $iframe !== 'undefined') {
if ($iframe.prop('width')) {
width = $iframe.prop('width');
if ($iframe.prop('height')) {
height = $iframe.prop('height');
this.resizePlayer(width,height);
}
}
}
};
AblePlayer.prototype.getYouTubeCaptionTracks = function (youTubeId) {
// get data via YouTube IFrame Player API, and push data to this.tracks & this.captions
// NOTE: Caption tracks are not available through the IFrame Player API
// until AFTER the video has started playing.
// Therefore, this function plays the video briefly in order to load the captions module
// then stops the video and collects the data needed to build the cc menu
// This is stupid, but seemingly unavoidable.
// Caption tracks could be obtained through the YouTube Data API
// but this required authors to have a Google API key,
// which would complicate Able Player installation
var deferred = new $.Deferred();
var promise = deferred.promise();
var thisObj, ytTracks, i, trackLang, trackLabel, isDefaultTrack;
thisObj = this;
if (!this.youTubePlayer.getOption('captions','tracklist') ) {
// no tracks were found, probably because the captions module hasn't loaded
// play video briefly (required in order to load the captions module)
// and after the apiChange event is triggered, try again to retrieve tracks
this.youTubePlayer.addEventListener('onApiChange',function(x) {
// getDuration() also requires video to play briefly
// so, let's set that while we're here
thisObj.duration = thisObj.youTubePlayer.getDuration();
if (thisObj.loadingYouTubeCaptions) {
// loadingYouTubeCaptions is a stopgap in case onApiChange is called more than once
ytTracks = thisObj.youTubePlayer.getOption('captions','tracklist');
if (!thisObj.okToPlay) {
// Don't stopVideo() - that cancels loading
// Just pause
// No need to seekTo(0) - so little time has passed it isn't noticeable to the user
thisObj.youTubePlayer.pauseVideo();
}
if (ytTracks && ytTracks.length) {
// Step through ytTracks and add them to global tracks array
// Note: Unlike YouTube Data API, the IFrame Player API only returns
// tracks that are published, and does NOT include ASR captions
// So, no additional filtering is required
for (i=0; i < ytTracks.length; i++) {
trackLang = ytTracks[i].languageCode;
trackLabel = ytTracks[i].languageName; // displayName and languageName seem to always have the same value
isDefaultTrack = false;
if (typeof thisObj.captionLang !== 'undefined') {
if (trackLang === thisObj.captionLang) {
isDefaultTrack = true;
}
}
else if (typeof thisObj.lang !== 'undefined') {
if (trackLang === thisObj.lang) {
isDefaultTrack = true;
}
}
thisObj.tracks.push({
'kind': 'captions',
'language': trackLang,
'label': trackLabel,
'def': isDefaultTrack
});
thisObj.captions.push({
'language': trackLang,
'label': trackLabel,
'def': isDefaultTrack,
'cues': null
});
}
thisObj.hasCaptions = true;
// setupPopups again with new captions array, replacing original
thisObj.setupPopups('captions');
}
else {
// there are no YouTube captions
thisObj.usingYouTubeCaptions = false;
thisObj.hasCaptions = false;
}
thisObj.loadingYouTubeCaptions = false;
if (thisObj.okToPlay) {
thisObj.youTubePlayer.playVideo();
}
}
if (thisObj.captionLangPending) {
// user selected a new caption language prior to playback starting
// set it now
thisObj.youTubePlayer.setOption('captions', 'track', {'languageCode': thisObj.captionLangPending});
thisObj.captionLangPending = null;
}
if (typeof thisObj.prefCaptionsSize !== 'undefined') {
// set the default caption size
// this doesn't work until the captions module is loaded
thisObj.youTubePlayer.setOption('captions','fontSize',thisObj.translatePrefs('size',thisObj.prefCaptionsSize,'youtube'));
}
deferred.resolve();
});
// Trigger the above event listener by briefly playing the video
this.loadingYouTubeCaptions = true;
this.youTubePlayer.playVideo();
}
return promise;
};
AblePlayer.prototype.getYouTubePosterUrl = function (youTubeId, width) {
// return a URL for retrieving a YouTube poster image
// supported values of width: 120, 320, 480, 640, 1280, 1920.
var url = 'https://img.youtube.com/vi/' + youTubeId;
if (width == '120') {
// default (small) thumbnail, 120 x 90
return url + '/default.jpg';
}
else if (width == '320') {
// medium quality thumbnail, 320 x 180
return url + '/mqdefault.jpg';
}
else if (width == '480') {
// high quality thumbnail, 480 x 360
return url + '/hqdefault.jpg';
}
else if (width == '640') {
// standard definition poster image, 640 x 480
return url + '/sddefault.jpg';
}
else if (width == '1280') {
// standard definition poster image, 640 x 480
return url + '/hq720.jpg';
}
else if ( width == '1920' ) {
// standard definition poster image, 640 x 480
return url + '/maxresdefault.jpg';
}
return false;
};
AblePlayer.prototype.getYouTubeId = function (url) {
// return a YouTube ID, extracted from a full YouTube URL
// Supported URL patterns (with http or https):
// https://youtu.be/xxx
// https://www.youtube.com/watch?v=xxx
// https://www.youtube.com/embed/xxx
// in all supported patterns, the id is the last 11 characters
var idStartPos, id;
if (url.indexOf('youtu') !== -1) {
// this is a full Youtube URL
url = url.trim();
idStartPos = url.length - 11;
id = url.substring(idStartPos);
return id;
}
else {
return url;
}
};
})(jQuery);