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transcript.js
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248 lines (222 loc) · 8.63 KB
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(function ($) {
AblePlayer.prototype.updateTranscript = function() {
if (!this.includeTranscript) {
return;
}
// Update transcript.
var captions;
var descriptions;
var captionLang;
if (this.transcriptCaptions) {
// use this independently of this.selectedCaptions
// user might want captions in one language, transcript in another
captionLang = this.transcriptCaptions.language;
captions = this.transcriptCaptions.cues;
}
else if (this.selectedCaptions) {
captionLang = this.captionLang;
captions = this.selectedCaptions.cues;
}
if (this.transcriptDescriptions) {
descriptions = this.transcriptDescriptions.cues;
}
else if (this.descriptions.length > 0) {
// Try and match the caption language.
if (captionLang) {
for (var ii in this.descriptions) {
if (this.descriptions[ii].language === captionLang) {
descriptions = this.descriptions[ii].cues;
}
}
}
if (!descriptions) {
descriptions = this.descriptions[0].cues;
}
}
var div = this.generateTranscript(captions || [], descriptions || []);
this.$transcriptDiv.html(div);
var thisObj = this;
// Make transcript tabbable if preference is turned on.
if (this.prefTabbable === 1) {
$('.able-transcript span.able-transcript-seekpoint').attr('tabindex','0');
}
// handle clicks on text within transcript
// Note #1: Only one transcript per page is supported
// Note #2: Pressing Enter on an element that is not natively clickable does NOT trigger click()
// Forcing this elsewhere, in the keyboard handler section
if ($('.able-transcript').length > 0) {
$('.able-transcript span.able-transcript-seekpoint').click(function(event) {
var spanStart = parseFloat($(this).attr('data-start'));
// Add a tiny amount so that we're inside the span.
spanStart += .01;
thisObj.seekTo(spanStart);
});
}
};
AblePlayer.prototype.highlightTranscript = function (currentTime) {
if (!this.includeTranscript) {
return;
}
//show highlight in transcript marking current caption
var start, end;
var thisObj = this;
currentTime = parseFloat(currentTime);
// Highlight the current transcript item.
$('.able-transcript span.able-transcript-caption').each(function() {
start = parseFloat($(this).attr('data-start'));
end = parseFloat($(this).attr('data-end'));
if (currentTime >= start && currentTime <= end) {
// move all previous highlights before adding one to current span
$('.able-highlight').removeClass('able-highlight');
$(this).addClass('able-highlight');
return false;
}
});
thisObj.currentHighlight = $('.able-highlight');
if (thisObj.currentHighlight.length === 0) {
// Nothing highlighted.
thisObj.currentHighlight = null;
}
};
AblePlayer.prototype.generateTranscript = function(captions, descriptions) {
var thisObj = this;
var main = $('<div class="able-transcript-container"></div>');
// TODO: Make scrolling optional?
var transcriptTitle = 'Transcript';
if (typeof this.transcriptTitle !== 'undefined') {
transcriptTitle = this.transcriptTitle;
}
else if (this.lyricsMode) {
transcriptTitle = 'Lyrics';
}
if (typeof this.transcriptDivLocation === 'undefined' && transcriptTitle != '') {
// only add an HTML heading to internal transcript
// external transcript is expected to have its own heading
var headingNumber = this.playerHeadingLevel;
headingNumber += 1;
if (headingNumber > 6) {
headingNumber = 6;
}
var transcriptHeading = 'h' + headingNumber.toString();
var transcriptHeadingTag = '<' + transcriptHeading + ' class="able-transcript-heading">';
transcriptHeadingTag += transcriptTitle;
transcriptHeadingTag += '</' + transcriptHeading + '>';
main.append(transcriptHeadingTag);
}
var nextCap = 0;
var nextDesc = 0;
var addDescription = function(div, desc) {
var descDiv = $('<div class="able-desc"><span class="hidden">Description: </span></div>');
var flattenComponentForDescription = function(comp) {
var result = [];
if (comp.type === 'string') {
result.push(comp.value);
}
else {
for (var ii in comp.children) {
result = result.concat(flattenComponentForDescription(comp.children[ii]));
}
}
return result;
}
var descSpan = $('<span class="able-transcript-seekpoint"></span>');
for (var ii in desc.components.children) {
var results = flattenComponentForDescription(desc.components.children[ii]);
for (var jj in results) {
descSpan.append(results[jj]);
}
}
descSpan.attr('data-start', desc.start.toString());
descSpan.attr('data-end', desc.end.toString());
descDiv.append(descSpan);
div.append(descDiv);
};
var addCaption = function(div, cap) {
var capSpan = $('<span class="able-transcript-seekpoint able-transcript-caption"></span>');
var flattenComponentForCaption = function(comp) {
var result = [];
var flattenString = function (str) {
var result = [];
if (str === '') {
return result;
}
var openBracket = str.indexOf('[');
var closeBracket = str.indexOf(']');
var openParen = str.indexOf('(');
var closeParen = str.indexOf(')');
var hasBrackets = openBracket !== -1 && closeBracket !== -1;
var hasParens = openParen !== -1 && closeParen !== -1;
if ((hasParens && hasBrackets && openBracket < openParen) || hasBrackets) {
result = result.concat(flattenString(str.substring(0, openBracket)));
result.push($('<div></div><span class="able-unspoken">' + str.substring(openBracket, closeBracket + 1) + '</span>'));
result = result.concat(flattenString(str.substring(closeBracket + 1)));
}
else if (hasParens) {
result = result.concat(flattenString(str.substring(0, openParen)));
result.push($('<div></div><span class="able-unspoken">' + str.substring(openParen, closeParen + 1) + '</span>'));
result = result.concat(flattenString(str.substring(closeParen + 1)));
}
else {
result.push(str);
}
return result;
};
if (comp.type === 'string') {
result = result.concat(flattenString(comp.value));
}
else if (comp.type === 'v') {
var vSpan = $('<div></div><span class="able-unspoken">[' + comp.value + ']</span>');
result.push(vSpan);
for (var ii in comp.children) {
var subResults = flattenComponentForCaption(comp.children[ii]);
for (var jj in subResults) {
result.push(subResults[jj]);
}
}
}
else {
for (var ii in comp.children) {
result = result.concat(flattenComponentForCaption(comp.children[ii]));
}
}
return result;
};
for (var ii in cap.components.children) {
var results = flattenComponentForCaption(cap.components.children[ii]);
for (var jj in results) {
var result = results[jj];
if (typeof result === 'string' && thisObj.lyricsMode) {
// add <br> BETWEEN each caption and WITHIN each caption (if payload includes "\n")
result = result.replace('\n','<br>') + '<br>';
}
capSpan.append(result);
}
}
capSpan.attr('data-start', cap.start.toString());
capSpan.attr('data-end', cap.end.toString());
div.append(capSpan);
div.append('\n');
};
while ((nextCap < captions.length) || (nextDesc < descriptions.length)) {
if ((nextCap < captions.length) && (nextDesc < descriptions.length)) {
if (descriptions[nextDesc].start <= captions[nextCap].start) {
addDescription(main, descriptions[nextDesc]);
nextDesc += 1;
}
else {
addCaption(main, captions[nextCap]);
nextCap += 1;
}
}
else if (nextCap < captions.length) {
addCaption(main, captions[nextCap]);
nextCap += 1;
}
else if (nextDesc < descriptions.length) {
addDescription(main, descriptions[nextDesc]);
nextDesc += 1;
}
}
return main;
};
})(jQuery);