367 lines
10 KiB
JavaScript
367 lines
10 KiB
JavaScript
(function($){
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if(webshims.support.texttrackapi && document.addEventListener){
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var trackOptions = webshims.cfg.track;
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var trackListener = function(e){
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$(e.target).filter('track').each(changeApi);
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};
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var trackBugs = webshims.bugs.track;
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var changeApi = function(){
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if(trackBugs || (!trackOptions.override && $.prop(this, 'readyState') == 3)){
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trackOptions.override = true;
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webshims.reTest('track');
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document.removeEventListener('error', trackListener, true);
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if(this && $.nodeName(this, 'track')){
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webshims.error("track support was overwritten. Please check your vtt including your vtt mime-type");
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} else {
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webshims.info("track support was overwritten. due to bad browser support");
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}
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return false;
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}
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};
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var detectTrackError = function(){
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document.addEventListener('error', trackListener, true);
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if(trackBugs){
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changeApi();
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} else {
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$('track').each(changeApi);
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}
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if(!trackBugs && !trackOptions.override){
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webshims.defineProperty(TextTrack.prototype, 'shimActiveCues', {
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get: function(){
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return this._shimActiveCues || this.activeCues;
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}
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});
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}
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};
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if(!trackOptions.override){
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$(detectTrackError);
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}
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}
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})(webshims.$);
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webshims.register('track-ui', function($, webshims, window, document, undefined){
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"use strict";
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var options = webshims.cfg.track;
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var support = webshims.support;
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//descriptions are not really shown, but they are inserted into the dom
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var showTracks = {subtitles: 1, captions: 1, descriptions: 1};
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var mediaelement = webshims.mediaelement;
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var usesNativeTrack = function(){
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return !options.override && support.texttrackapi;
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};
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var trackDisplay = {
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update: function(baseData, media){
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if(!baseData.activeCues.length){
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this.hide(baseData);
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} else {
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if(!compareArray(baseData.displayedActiveCues, baseData.activeCues)){
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baseData.displayedActiveCues = baseData.activeCues;
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if(!baseData.trackDisplay){
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baseData.trackDisplay = $('<div class="cue-display '+webshims.shadowClass+'"><span class="description-cues" aria-live="assertive" /></div>').insertAfter(media);
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this.addEvents(baseData, media);
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webshims.docObserve();
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}
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if(baseData.hasDirtyTrackDisplay){
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media.triggerHandler('forceupdatetrackdisplay');
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}
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this.showCues(baseData);
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}
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}
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},
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showCues: function(baseData){
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var element = $('<span class="cue-wrapper" />');
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$.each(baseData.displayedActiveCues, function(i, cue){
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var id = (cue.id) ? 'id="cue-id-'+cue.id +'"' : '';
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var cueHTML = $('<span class="cue-line"><span '+ id+ ' class="cue" /></span>').find('span').html(cue.getCueAsHTML()).end();
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if(cue.track.kind == 'descriptions'){
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setTimeout(function(){
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$('span.description-cues', baseData.trackDisplay).html(cueHTML);
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}, 0);
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} else {
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element.prepend(cueHTML);
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}
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});
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$('span.cue-wrapper', baseData.trackDisplay).remove();
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baseData.trackDisplay.append(element);
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},
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addEvents: function(baseData, media){
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if(options.positionDisplay){
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var timer;
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var positionDisplay = function(_force){
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if(baseData.displayedActiveCues.length || _force === true){
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baseData.trackDisplay.css({display: 'none'});
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var uiElement = media.getShadowElement();
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var uiHeight = uiElement.innerHeight();
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var uiWidth = uiElement.innerWidth();
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var position = uiElement.position();
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baseData.trackDisplay.css({
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left: position.left,
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width: uiWidth,
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height: uiHeight - 45,
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top: position.top,
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display: 'block'
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});
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baseData.trackDisplay.css('fontSize', Math.max(Math.round(uiHeight / 30), 7));
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baseData.hasDirtyTrackDisplay = false;
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} else {
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baseData.hasDirtyTrackDisplay = true;
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}
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};
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var delayed = function(e){
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clearTimeout(timer);
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timer = setTimeout(positionDisplay, 0);
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};
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var forceUpdate = function(){
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positionDisplay(true);
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};
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media.on('playerdimensionchange mediaelementapichange updatetrackdisplay updatemediaelementdimensions swfstageresize', delayed);
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media.on('forceupdatetrackdisplay', forceUpdate).onWSOff('updateshadowdom', delayed);
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forceUpdate();
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}
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},
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hide: function(baseData){
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if(baseData.trackDisplay && baseData.displayedActiveCues.length){
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baseData.displayedActiveCues = [];
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$('span.cue-wrapper', baseData.trackDisplay).remove();
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$('span.description-cues', baseData.trackDisplay).empty();
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}
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}
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};
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function compareArray(a1, a2){
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var ret = true;
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var i = 0;
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var len = a1.length;
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if(len != a2.length){
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ret = false;
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} else {
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for(; i < len; i++){
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if(a1[i] != a2[i]){
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ret = false;
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break;
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}
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}
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}
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return ret;
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}
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mediaelement.trackDisplay = trackDisplay;
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if(!mediaelement.createCueList){
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var cueListProto = {
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getCueById: function(id){
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var cue = null;
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for(var i = 0, len = this.length; i < len; i++){
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if(this[i].id === id){
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cue = this[i];
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break;
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}
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}
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return cue;
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}
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};
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mediaelement.createCueList = function(){
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return $.extend([], cueListProto);
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};
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}
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mediaelement.getActiveCue = function(track, media, time, baseData){
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if(!track._lastFoundCue){
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track._lastFoundCue = {index: 0, time: 0};
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}
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if(support.texttrackapi && !options.override && !track._shimActiveCues){
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track._shimActiveCues = mediaelement.createCueList();
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}
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var i = 0;
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var len;
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var cue;
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for(; i < track.shimActiveCues.length; i++){
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cue = track.shimActiveCues[i];
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if(cue.startTime > time || cue.endTime < time){
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track.shimActiveCues.splice(i, 1);
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i--;
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if(cue.pauseOnExit){
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$(media).pause();
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}
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$(track).triggerHandler('cuechange');
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$(cue).triggerHandler('exit');
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} else if(track.mode == 'showing' && showTracks[track.kind] && $.inArray(cue, baseData.activeCues) == -1){
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baseData.activeCues.push(cue);
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}
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}
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len = track.cues.length;
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i = track._lastFoundCue.time < time ? track._lastFoundCue.index : 0;
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for(; i < len; i++){
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cue = track.cues[i];
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if(cue.startTime <= time && cue.endTime >= time && $.inArray(cue, track.shimActiveCues) == -1){
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track.shimActiveCues.push(cue);
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if(track.mode == 'showing' && showTracks[track.kind]){
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baseData.activeCues.push(cue);
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}
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$(track).triggerHandler('cuechange');
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$(cue).triggerHandler('enter');
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track._lastFoundCue.time = time;
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track._lastFoundCue.index = i;
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}
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if(cue.startTime > time){
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break;
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}
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}
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};
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if(usesNativeTrack()){
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(function(){
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var block;
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var triggerDisplayUpdate = function(elem){
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block = true;
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setTimeout(function(){
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$(elem).triggerHandler('updatetrackdisplay');
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block = false;
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}, 9);
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};
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var createUpdateFn = function(nodeName, prop, type){
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var superType = '_sup'+type;
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var desc = {prop: {}};
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var superDesc;
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desc.prop[type] = function(){
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if(!block && usesNativeTrack()){
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triggerDisplayUpdate($(this).closest('audio, video'));
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}
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return superDesc.prop[superType].apply(this, arguments);
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};
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superDesc = webshims.defineNodeNameProperty(nodeName, prop, desc);
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};
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createUpdateFn('track', 'track', 'get');
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['audio', 'video'].forEach(function(nodeName){
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createUpdateFn(nodeName, 'textTracks', 'get');
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createUpdateFn('nodeName', 'addTextTrack', 'value');
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});
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})();
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$.propHooks.activeCues = {
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get: function(obj){
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return obj._shimActiveCues || obj.activeCues;
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}
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};
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}
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webshims.addReady(function(context, insertedElement){
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$('video, audio', context)
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.add(insertedElement.filter('video, audio'))
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.filter(function(){
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return webshims.implement(this, 'trackui');
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})
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.each(function(){
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var baseData, trackList, updateTimer, updateTimer2;
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var elem = $(this);
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var getDisplayCues = function(e){
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var track;
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var time;
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if(!trackList || !baseData){
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trackList = elem.prop('textTracks');
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baseData = webshims.data(elem[0], 'mediaelementBase') || webshims.data(elem[0], 'mediaelementBase', {});
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if(!baseData.displayedActiveCues){
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baseData.displayedActiveCues = [];
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}
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}
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if (!trackList){return;}
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time = elem.prop('currentTime');
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if(!time && time !== 0){return;}
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baseData.activeCues = [];
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for(var i = 0, len = trackList.length; i < len; i++){
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track = trackList[i];
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if(track.mode != 'disabled' && track.cues && track.cues.length){
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mediaelement.getActiveCue(track, elem, time, baseData);
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}
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}
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trackDisplay.update(baseData, elem);
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};
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var onUpdate = function(e){
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clearTimeout(updateTimer);
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if(e){
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if(e.type == 'timeupdate'){
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getDisplayCues();
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}
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updateTimer2 = setTimeout(onUpdate, 90);
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} else {
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updateTimer = setTimeout(getDisplayCues, 9);
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}
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};
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var addTrackView = function(){
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if(!trackList) {
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trackList = elem.prop('textTracks');
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}
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//as soon as change on trackList is implemented in all browsers we do not need to have 'updatetrackdisplay' anymore
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$( [trackList] ).on('change', onUpdate);
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elem
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.off('.trackview')
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.on('play.trackview timeupdate.trackview updatetrackdisplay.trackview', onUpdate)
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;
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};
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elem.on('remove', function(e){
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if(!e.originalEvent && baseData && baseData.trackDisplay){
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setTimeout(function(){
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baseData.trackDisplay.remove();
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}, 4);
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}
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});
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if(!usesNativeTrack()){
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addTrackView();
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} else {
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if(elem.is('.nonnative-api-active')){
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addTrackView();
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}
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elem
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.on('mediaelementapichange trackapichange', function(){
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if(!usesNativeTrack() || elem.is('.nonnative-api-active')){
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addTrackView();
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} else {
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clearTimeout(updateTimer);
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clearTimeout(updateTimer2);
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trackList = elem.prop('textTracks');
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baseData = webshims.data(elem[0], 'mediaelementBase') || webshims.data(elem[0], 'mediaelementBase', {});
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$.each(trackList, function(i, track){
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if(track._shimActiveCues){
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delete track._shimActiveCues;
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}
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});
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trackDisplay.hide(baseData);
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elem.off('.trackview');
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}
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})
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;
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}
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})
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;
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});
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});
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