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transcript.js
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754 lines (688 loc) · 24.7 KB
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(function ($) {
AblePlayer.prototype.setupTranscript = function () {
var deferred = new $.Deferred();
var promise = deferred.promise();
if (this.usingYouTubeCaptions || this.usingVimeoCaptions) {
// a transcript is not possible
this.transcriptType = null;
deferred.resolve();
} else {
if (!this.transcriptType) {
// previously set transcriptType to null since there are no <track> elements
// check again to see if captions have been collected from other sources (e.g., YouTube)
if (this.captions.length) {
// captions are possible! Use the default type (popup)
// if other types ('external' and 'manual') were desired, transcriptType would not be null here
this.transcriptType = "popup";
}
}
if (this.transcriptType) {
if (
this.transcriptType === "popup" ||
this.transcriptType === "external"
) {
this.injectTranscriptArea();
deferred.resolve();
} else if (this.transcriptType === "manual") {
this.setupManualTranscript();
deferred.resolve();
}
} else {
// there is no transcript
deferred.resolve();
}
}
return promise;
};
AblePlayer.prototype.injectTranscriptArea = function () {
var thisObj,
$autoScrollLabel,
$languageSelectWrapper,
$languageSelectLabel,
i,
$option;
thisObj = this;
this.$transcriptArea = $("<div>", {
class: "able-transcript-area",
role: "dialog",
"aria-label": this.tt.transcriptTitle,
});
this.$transcriptToolbar = $("<div>", {
class: "able-window-toolbar able-" + this.toolbarIconColor + "-controls",
});
this.$transcriptDiv = $("<div>", {
class: "able-transcript",
});
// Transcript toolbar content
// Add auto Scroll checkbox
this.$autoScrollTranscriptCheckbox = $("<input>", {
id: "autoscroll-transcript-checkbox-" + this.mediaId,
type: "checkbox",
});
$autoScrollLabel = $("<label>", {
for: "autoscroll-transcript-checkbox-" + this.mediaId,
}).text(this.tt.autoScroll);
this.$transcriptToolbar.append(
$autoScrollLabel,
this.$autoScrollTranscriptCheckbox
);
// Add field for selecting a transcript language
// Only necessary if there is more than one language
if (this.captions.length > 1) {
$languageSelectWrapper = $("<div>", {
class: "transcript-language-select-wrapper",
});
$languageSelectLabel = $("<label>", {
for: "transcript-language-select-" + this.mediaId,
}).text(this.tt.language);
this.$transcriptLanguageSelect = $("<select>", {
id: "transcript-language-select-" + this.mediaId,
});
for (i = 0; i < this.captions.length; i++) {
$option = $("<option></option>", {
value: this.captions[i]["language"],
lang: this.captions[i]["language"],
}).text(this.captions[i]["label"]);
if (this.captions[i]["def"]) {
$option.prop("selected", true);
}
this.$transcriptLanguageSelect.append($option);
}
}
if ($languageSelectWrapper) {
$languageSelectWrapper.append(
$languageSelectLabel,
this.$transcriptLanguageSelect
);
this.$transcriptToolbar.append($languageSelectWrapper);
}
this.$transcriptArea.append(this.$transcriptToolbar, this.$transcriptDiv);
// If client has provided separate transcript location, put it there.
// Otherwise append it to the body
if (this.transcriptDivLocation) {
$("#" + this.transcriptDivLocation).append(this.$transcriptArea);
} else {
this.$ableWrapper.append(this.$transcriptArea);
}
// make it draggable (popup only; NOT external transcript)
if (!this.transcriptDivLocation) {
this.initDragDrop("transcript");
if (this.prefTranscript === 1) {
// transcript is on. Go ahead and position it
this.positionDraggableWindow(
"transcript",
this.getDefaultWidth("transcript")
);
}
}
// If client has provided separate transcript location, override user's preference for hiding transcript
if (!this.prefTranscript && !this.transcriptDivLocation) {
this.$transcriptArea.hide();
}
};
AblePlayer.prototype.addTranscriptAreaEvents = function () {
var thisObj = this;
this.$autoScrollTranscriptCheckbox.click(function () {
thisObj.handleTranscriptLockToggle(
thisObj.$autoScrollTranscriptCheckbox.prop("checked")
);
});
this.$transcriptDiv.on(
"mousewheel DOMMouseScroll click scroll",
function (e) {
// Propagation is stopped in transcript click handler, so clicks are on the scrollbar
// or outside of a clickable span.
if (!thisObj.scrollingTranscript) {
thisObj.autoScrollTranscript = false;
thisObj.refreshControls("transcript");
}
thisObj.scrollingTranscript = false;
}
);
if (typeof this.$transcriptLanguageSelect !== "undefined") {
this.$transcriptLanguageSelect.on("click mousedown", function (e) {
// execute default behavior
// prevent propagation of mouse event to toolbar or window
e.stopPropagation();
});
this.$transcriptLanguageSelect.on("change", function () {
var language = thisObj.$transcriptLanguageSelect.val();
thisObj.syncTrackLanguages("transcript", language);
});
}
};
AblePlayer.prototype.transcriptSrcHasRequiredParts = function () {
// check the external transcript to be sure it has all required components
// return true or false
// in the process, define all the needed variables and properties
if ($("#" + this.transcriptSrc).length) {
this.$transcriptArea = $("#" + this.transcriptSrc);
if (this.$transcriptArea.find(".able-window-toolbar").length) {
this.$transcriptToolbar = this.$transcriptArea
.find(".able-window-toolbar")
.eq(0);
if (this.$transcriptArea.find(".able-transcript").length) {
this.$transcriptDiv = this.$transcriptArea
.find(".able-transcript")
.eq(0);
if (this.$transcriptArea.find(".able-transcript-seekpoint").length) {
this.$transcriptSeekpoints = this.$transcriptArea.find(
".able-transcript-seekpoint"
);
return true;
}
}
}
}
return false;
};
AblePlayer.prototype.setupManualTranscript = function () {
var $autoScrollInput, $autoScrollLabel;
$autoScrollInput = $("<input>", {
id: "autoscroll-transcript-checkbox-" + this.mediaId,
type: "checkbox",
});
$autoScrollLabel = $("<label>", {
for: "autoscroll-transcript-checkbox-" + this.mediaId,
}).text(this.tt.autoScroll);
// Add an auto-scroll checkbox to the toolbar.
this.$autoScrollTranscriptCheckbox = $autoScrollInput;
this.$transcriptToolbar.append(
$autoScrollLabel,
this.$autoScrollTranscriptCheckbox
);
};
AblePlayer.prototype.updateTranscript = function () {
if (!this.transcriptType) {
return;
}
if (this.playerCreated && !this.$transcriptArea) {
return;
}
if (this.transcriptType === "external" || this.transcriptType === "popup") {
var chapters, captions, descriptions;
// Language of transcript might be different than language of captions
// But both are in sync by default
if (this.transcriptLang) {
captions = this.transcriptCaptions.cues;
} else {
if (this.transcriptCaptions) {
this.transcriptLang = this.transcriptCaptions.language;
captions = this.transcriptCaptions.cues;
} else if (this.selectedCaptions) {
this.transcriptLang = this.captionLang;
captions = this.selectedCaptions.cues;
}
}
// setup chapters
if (this.transcriptChapters) {
chapters = this.transcriptChapters.cues;
} else if (this.chapters.length > 0) {
// Try and match the caption language.
if (this.transcriptLang) {
for (var i = 0; i < this.chapters.length; i++) {
if (this.chapters[i].language === this.transcriptLang) {
chapters = this.chapters[i].cues;
}
}
}
if (typeof chapters === "undefined") {
chapters = this.chapters[0].cues || [];
}
}
// setup descriptions
if (this.transcriptDescriptions) {
descriptions = this.transcriptDescriptions.cues;
} else if (this.descriptions.length > 0) {
// Try and match the caption language.
if (this.transcriptLang) {
for (var i = 0; i < this.descriptions.length; i++) {
if (this.descriptions[i].language === this.transcriptLang) {
descriptions = this.descriptions[i].cues;
}
}
}
if (!descriptions) {
descriptions = this.descriptions[0].cues || [];
}
}
var div = this.generateTranscript(
chapters || [],
captions || [],
descriptions || []
);
this.$transcriptDiv.html(div);
// reset transcript selected <option> to this.transcriptLang
if (this.$transcriptLanguageSelect) {
this.$transcriptLanguageSelect
.find("option:selected")
.prop("selected", false);
this.$transcriptLanguageSelect
.find("option[lang=" + this.transcriptLang + "]")
.prop("selected", true);
}
}
var thisObj = this;
// Make transcript tabbable if preference is turned on.
if (this.prefTabbable === 1) {
this.$transcriptDiv
.find("span.able-transcript-seekpoint")
.attr("tabindex", "0");
}
// handle clicks on text within transcript
// Note: This event listeners handles clicks only, not keydown events
// Pressing Enter on an element that is not natively clickable does NOT trigger click()
// Keydown events are handled elsehwere, both globally (ableplayer-base.js) and locally (event.js)
if (this.$transcriptArea.length > 0) {
this.$transcriptArea
.find("span.able-transcript-seekpoint")
.click(function (e) {
thisObj.seekTrigger = "transcript";
var spanStart = parseFloat($(this).attr("data-start"));
// Add a tiny amount so that we're inside the span.
spanStart += 0.01;
// Each click within the transcript triggers two click events (not sure why)
// this.seekingFromTranscript is a stopgab to prevent two calls to SeekTo()
if (!thisObj.seekingFromTranscript) {
thisObj.seekingFromTranscript = true;
thisObj.seekTo(spanStart);
} else {
// don't seek a second time, but do reset var
thisObj.seekingFromTranscript = false;
}
});
}
};
AblePlayer.prototype.highlightTranscript = function (currentTime) {
// Show highlight in transcript marking current caption.
if (!this.transcriptType) {
return;
}
var start, end, isChapterHeading;
var thisObj = this;
currentTime = parseFloat(currentTime);
// Highlight the current transcript item.
this.$transcriptArea
.find("span.able-transcript-seekpoint")
.each(function () {
start = parseFloat($(this).attr("data-start"));
end = parseFloat($(this).attr("data-end"));
// be sure this isn't a chapter (don't highlight chapter headings)
if ($(this).parent().hasClass("able-transcript-chapter-heading")) {
isChapterHeading = true;
} else {
isChapterHeading = false;
}
if (currentTime >= start && currentTime <= end && !isChapterHeading) {
// If this item isn't already highlighted, it should be
if (!$(this).hasClass("able-highlight")) {
// remove all previous highlights before adding one to current span
thisObj.$transcriptArea
.find(".able-highlight")
.removeClass("able-highlight");
$(this).addClass("able-highlight");
thisObj.movingHighlight = true;
}
return false;
}
});
thisObj.currentHighlight = thisObj.$transcriptArea.find(".able-highlight");
if (thisObj.currentHighlight.length === 0) {
// Nothing highlighted.
thisObj.currentHighlight = null;
}
};
AblePlayer.prototype.generateTranscript = function (
chapters,
captions,
descriptions
) {
var thisObj = this;
var $main = $('<div class="able-transcript-container"></div>');
var transcriptTitle;
// set language for transcript container
$main.attr("lang", this.transcriptLang);
if (typeof this.transcriptTitle !== "undefined") {
transcriptTitle = this.transcriptTitle;
} else if (this.lyricsMode) {
transcriptTitle = this.tt.lyricsTitle;
} else {
transcriptTitle = this.tt.transcriptTitle;
}
if (!this.transcriptDivLocation) {
// only add an HTML heading to internal transcript
// external transcript is expected to have its own heading
var headingNumber = this.playerHeadingLevel;
headingNumber += 1;
var chapterHeadingNumber = headingNumber + 1;
if (headingNumber <= 6) {
var transcriptHeading = "h" + headingNumber.toString();
} else {
var transcriptHeading = "div";
}
var $transcriptHeadingTag = $("<" + transcriptHeading + ">");
$transcriptHeadingTag.addClass("able-transcript-heading");
if (headingNumber > 6) {
$transcriptHeadingTag.attr({
role: "heading",
"aria-level": headingNumber,
});
}
$transcriptHeadingTag.text(transcriptTitle);
// set language of transcript heading to language of player
// this is independent of language of transcript
$transcriptHeadingTag.attr("lang", this.lang);
$main.append($transcriptHeadingTag);
}
var nextChapter = 0;
var nextCap = 0;
var nextDesc = 0;
var addChapter = function (div, chap) {
if (chapterHeadingNumber <= 6) {
var chapterHeading = "h" + chapterHeadingNumber.toString();
} else {
var chapterHeading = "div";
}
var $chapterHeadingTag = $("<" + chapterHeading + ">", {
class: "able-transcript-chapter-heading",
});
if (chapterHeadingNumber > 6) {
$chapterHeadingTag.attr({
role: "heading",
"aria-level": chapterHeadingNumber,
});
}
var flattenComponentForChapter = function (comp) {
var result = [];
if (comp.type === "string") {
result.push(comp.value);
} else {
for (var i = 0; i < comp.children.length; i++) {
result = result.concat(
flattenComponentForChapter(comp.children[i])
);
}
}
return result;
};
var $chapSpan = $("<span>", {
class: "able-transcript-seekpoint",
});
for (var i = 0; i < chap.components.children.length; i++) {
var results = flattenComponentForChapter(chap.components.children[i]);
for (var jj = 0; jj < results.length; jj++) {
$chapSpan.append(results[jj]);
}
}
$chapSpan.attr("data-start", chap.start.toString());
$chapSpan.attr("data-end", chap.end.toString());
$chapterHeadingTag.append($chapSpan);
div.append($chapterHeadingTag);
};
var addDescription = function (div, desc) {
var $descDiv = $("<div>", {
class: "able-transcript-desc",
});
var $descHiddenSpan = $("<span>", {
class: "able-hidden",
});
$descHiddenSpan.attr("lang", thisObj.lang);
$descHiddenSpan.text(thisObj.tt.prefHeadingDescription + ": ");
$descDiv.append($descHiddenSpan);
var flattenComponentForDescription = function (comp) {
var result = [];
if (comp.type === "string") {
result.push(comp.value);
} else {
for (var i = 0; i < comp.children.length; i++) {
result = result.concat(
flattenComponentForDescription(comp.children[i])
);
}
}
return result;
};
var $descSpan = $("<span>", {
class: "able-transcript-seekpoint",
});
for (var i = 0; i < desc.components.children.length; i++) {
var results = flattenComponentForDescription(
desc.components.children[i]
);
for (var jj = 0; jj < results.length; jj++) {
$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",
});
var flattenComponentForCaption = function (comp) {
var result = [];
var parts = 0;
var flattenString = function (str) {
parts++;
var flatStr;
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) {
if (parts > 1) {
// force a line break between sections that contain parens or brackets
var silentSpanBreak = "<br/>";
} else {
var silentSpanBreak = "";
}
var silentSpanOpen =
silentSpanBreak + '<span class="able-unspoken">';
var silentSpanClose = "</span>";
if (hasParens && hasBrackets) {
// string has both!
if (openBracket < openParen) {
// brackets come first. Parse parens separately
hasParens = false;
} else {
// parens come first. Parse brackets separately
hasBrackets = false;
}
}
}
if (hasParens) {
flatStr = str.substring(0, openParen);
flatStr += silentSpanOpen;
flatStr += str.substring(openParen, closeParen + 1);
flatStr += silentSpanClose;
flatStr += flattenString(str.substring(closeParen + 1));
result.push(flatStr);
} else if (hasBrackets) {
flatStr = str.substring(0, openBracket);
flatStr += silentSpanOpen;
flatStr += str.substring(openBracket, closeBracket + 1);
flatStr += silentSpanClose;
flatStr += flattenString(str.substring(closeBracket + 1));
result.push(flatStr);
} else {
result.push(str);
}
return result;
};
if (comp.type === "string") {
result = result.concat(flattenString(comp.value));
} else if (comp.type === "v") {
var $vSpan = $("<span>", {
class: "able-unspoken",
});
// don't display "title=" when rendering the voice tag title in the transcript
comp.value = comp.value.replace(/^title="|\"$/g, "");
$vSpan.text("(" + comp.value + ")");
result.push($vSpan);
for (var i = 0; i < comp.children.length; i++) {
var subResults = flattenComponentForCaption(comp.children[i]);
for (var jj = 0; jj < subResults.length; jj++) {
result.push(subResults[jj]);
}
}
} else if (comp.type === "b" || comp.type === "i") {
if (comp.type === "b") {
var $tag = $("<strong>");
} else if (comp.type === "i") {
var $tag = $("<em>");
}
for (var i = 0; i < comp.children.length; i++) {
var subResults = flattenComponentForCaption(comp.children[i]);
for (var jj = 0; jj < subResults.length; jj++) {
$tag.append(subResults[jj]);
}
}
if (comp.type === "b" || comp.type == "i") {
result.push($tag, " ");
}
} else {
for (var i = 0; i < comp.children.length; i++) {
result = result.concat(
flattenComponentForCaption(comp.children[i])
);
}
}
return result;
};
for (var i = 0; i < cap.components.children.length; i++) {
var results = flattenComponentForCaption(cap.components.children[i]);
for (var jj = 0; jj < results.length; jj++) {
var result = results[jj];
if (typeof result === "string") {
if (thisObj.lyricsMode) {
// add <br> BETWEEN each caption and WITHIN each caption (if payload includes "\n")
result = result.replace(/\n/g, "<br>") + "<br>";
} else {
// just add a space between captions
result += " ";
}
}
$capSpan.append(result);
}
}
$capSpan.attr("data-start", cap.start.toString());
$capSpan.attr("data-end", cap.end.toString());
div.append($capSpan);
div.append(" \n");
};
// keep looping as long as any one of the three arrays has content
while (
nextChapter < chapters.length ||
nextDesc < descriptions.length ||
nextCap < captions.length
) {
if (
nextChapter < chapters.length &&
nextDesc < descriptions.length &&
nextCap < captions.length
) {
// they all three have content
var firstStart = Math.min(
chapters[nextChapter].start,
descriptions[nextDesc].start,
captions[nextCap].start
);
} else if (
nextChapter < chapters.length &&
nextDesc < descriptions.length
) {
// chapters & descriptions have content
var firstStart = Math.min(
chapters[nextChapter].start,
descriptions[nextDesc].start
);
} else if (nextChapter < chapters.length && nextCap < captions.length) {
// chapters & captions have content
var firstStart = Math.min(
chapters[nextChapter].start,
captions[nextCap].start
);
} else if (nextDesc < descriptions.length && nextCap < captions.length) {
// descriptions & captions have content
var firstStart = Math.min(
descriptions[nextDesc].start,
captions[nextCap].start
);
} else {
var firstStart = null;
}
if (firstStart !== null) {
if (
typeof chapters[nextChapter] !== "undefined" &&
chapters[nextChapter].start === firstStart
) {
addChapter($main, chapters[nextChapter]);
nextChapter += 1;
} else if (
typeof descriptions[nextDesc] !== "undefined" &&
descriptions[nextDesc].start === firstStart
) {
addDescription($main, descriptions[nextDesc]);
nextDesc += 1;
} else {
addCaption($main, captions[nextCap]);
nextCap += 1;
}
} else {
if (nextChapter < chapters.length) {
addChapter($main, chapters[nextChapter]);
nextChapter += 1;
} else if (nextDesc < descriptions.length) {
addDescription($main, descriptions[nextDesc]);
nextDesc += 1;
} else if (nextCap < captions.length) {
addCaption($main, captions[nextCap]);
nextCap += 1;
}
}
}
// organize transcript into blocks using [] and () as starting points
var $components = $main.children();
var spanCount = 0;
var openBlock = true;
$components.each(function () {
if ($(this).hasClass("able-transcript-caption")) {
if (
$(this).text().indexOf("[") !== -1 ||
$(this).text().indexOf("(") !== -1
) {
// this caption includes a bracket or parenth. Start a new block
// close the previous block first
if (spanCount > 0) {
$main
.find(".able-block-temp")
.removeClass("able-block-temp")
.wrapAll('<div class="able-transcript-block"></div>');
spanCount = 0;
}
}
$(this).addClass("able-block-temp");
spanCount++;
} else {
// this is not a caption. Close the caption block
if (spanCount > 0) {
$main
.find(".able-block-temp")
.removeClass("able-block-temp")
.wrapAll('<div class="able-transcript-block"></div>');
spanCount = 0;
}
}
});
return $main;
};
})(jQuery);