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description.js
File metadata and controls
184 lines (170 loc) · 5.85 KB
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(function ($) {
AblePlayer.prototype.initDescription = function() {
// set default mode for delivering description (open vs closed)
// based on availability and user preference
// first, check to see if there's an open-described version of this video
// checks only the first source
// Therefore, if a described version is provided,
// it must be provided for all sources
this.descFile = this.$sources.first().attr('data-desc-src');
if (this.descFile) {
if (this.debug) {
console.log('This video has a described version: ' + this.descFile);
}
this.hasOpenDesc = true;
if (this.prefDesc) {
this.descOn = true;
}
}
else {
if (this.debug) {
console.log('This video does not have a described version');
}
this.hasOpenDesc = false;
}
this.updateDescription();
};
AblePlayer.prototype.updateDescription = function (time) {
var useAudioDesc;
if (this.descOn) {
if (this.prefClosedDesc) {
useAudioDesc = false;
if (this.hasClosedDesc) {
if (this.prefVisibleDesc) {
this.$descDiv.show();
this.$descDiv.removeClass('able-clipped');
}
else {
this.$descDiv.hide();
this.$descDiv.addClass('able-clipped');
}
this.showDescription(time || this.getElapsed());
}
}
else {
useAudioDesc = true;
}
}
else {
this.$descDiv.hide();
useAudioDesc = false;
}
if (this.hasOpenDesc && this.usingAudioDescription() !== useAudioDesc) {
this.swapDescription();
}
};
// Returns true if currently using audio description, false otherwise.
AblePlayer.prototype.usingAudioDescription = function () {
return (this.$sources.first().attr('data-desc-src') === this.$sources.first().attr('src'));
};
AblePlayer.prototype.swapDescription = function() {
// swap described and non-described source media, depending on which is playing
// this function is only called in two circumstances:
// 1. Swapping to described version when initializing player (based on user prefs & availability)
// 2. User is toggling description
var i, origSrc, descSrc, srcType, jwSourceIndex, newSource;
if (!this.usingAudioDescription()) {
for (i=0; i < this.$sources.length; i++) {
// for all <source> elements, replace src with data-desc-src (if one exists)
// then store original source in a new data-orig-src attribute
origSrc = this.$sources[i].getAttribute('src');
descSrc = this.$sources[i].getAttribute('data-desc-src');
srcType = this.$sources[i].getAttribute('type');
if (descSrc) {
this.$sources[i].setAttribute('src',descSrc);
this.$sources[i].setAttribute('data-orig-src',origSrc);
}
if (srcType === 'video/mp4') {
jwSourceIndex = i;
}
}
if (this.initializing) { // user hasn't pressed play yet
this.swappingSrc = false;
}
else {
this.swappingSrc = true;
}
}
else {
// the described version is currently playing
// swap back to the original
for (i=0; i < this.$sources.length; i++) {
// for all <source> elements, replace src with data-orig-src
origSrc = this.$sources[i].getAttribute('data-orig-src');
srcType = this.$sources[i].getAttribute('type');
if (origSrc) {
this.$sources[i].setAttribute('src',origSrc);
}
if (srcType === 'video/mp4') {
jwSourceIndex = i;
}
}
// No need to check for this.initializing
// This function is only called during initialization
// if swapping from non-described to described
this.swappingSrc = true;
}
// now reload the source file.
if (this.player === 'html5') {
this.media.load();
}
else if (this.player === 'jw' && this.jwPlayer) {
newSource = this.$sources[jwSourceIndex].getAttribute('src');
this.jwPlayer.load({file: newSource});
}
else if (this.player === 'youtube') {
// Can't switch youtube tracks, so do nothing.
// TODO: Disable open descriptions button with Youtube.
}
};
AblePlayer.prototype.showDescription = function(now) {
// there's a lot of redundancy between this function and showCaptions
// Trying to combine them ended up in a mess though. Keeping as is for now.
var d, thisDescription;
var flattenComponentForDescription = function (component) {
var result = [];
if (component.type === 'string') {
result.push(component.value);
}
else {
for (var ii in component.children) {
result.push(flattenComponentForDescription(component.children[ii]));
}
}
return result.join('');
}
var cues;
if (this.selectedDescriptions) {
cues = this.selectedDescriptions.cues;
}
else if (this.descriptions.length >= 1) {
cues = this.descriptions[0].cues;
}
else {
cues = [];
}
for (d in cues) {
if ((cues[d].start <= now) && (cues[d].end > now)) {
thisDescription = d;
break;
}
}
if (typeof thisDescription !== 'undefined') {
if (this.currentDescription !== thisDescription) {
// load the new description into the container div
this.$descDiv.html(flattenComponentForDescription(cues[thisDescription].components));
if (this.prefDescPause) {
this.pauseMedia();
}
this.currentDescription = thisDescription;
if (this.$descDiv.is(':hidden')) {
this.$descDiv.show();
}
}
}
else {
this.$descDiv.html('');
this.currentDescription = -1;
}
};
})(jQuery);