Download subtitles / captions from YouTube in several formats
// ==UserScript==
// @name Download YouTube Captions
// @namespace http://userscripts.org/users/tim
// @include http://*youtube.com/watch*
// @include https://*youtube.com/watch*
// @author Tim Smart
// @copyright 2009 Tim Smart; 2011 gw111zz
// @license GNU GPL v3.0 or later. http://www.gnu.org/copyleft/gpl.html
// @version 0.0.1.20140425034707
// @description Download subtitles / captions from YouTube in several formats
// ==/UserScript==
var PLAYER = unsafeWindow.document.getElementById('movie_player'),
VIDEO_ID = unsafeWindow.yt.getConfig('VIDEO_ID'),
TITLE = unsafeWindow.ytplayer.config.args.title,
FORMATS = {srt: '.srt', text: 'text'},
FORMAT_SELECTOR_ID = 'format_selector',
caption_array = [];
var makeTimeline = function (time) {
var string,
time_array = [],
milliseconds = Math.round(time % 1 * 1000).toString();
while (3 > milliseconds.length) {
milliseconds = '0' + milliseconds;
}
time_array.push(Math.floor(time / (60 * 60)));
time_array.push(Math.floor((time - (time_array[0] * 60 * 60)) / 60));
time_array.push(Math.floor(time - ((time_array[1] * 60) + (time_array[0] * 60 * 60))));
for (var i = 0, il = time_array.length; i < il; i++) {
string = '' + time_array[i];
if (1 === string.length) {
time_array[i] = '0' + string;
}
}
return time_array.join(":") + "," + milliseconds;
}
function loadCaption (selector) {
var caption = caption_array[selector.selectedIndex - 1];
if (!caption) return;
GM_xmlhttpRequest({
method: 'GET',
url: 'http://video.google.com/timedtext?hl=' + caption.lang_code +
'&lang=' + caption.lang_code + '&name=' + caption.name + '&v=' + VIDEO_ID,
onload:function(xhr) {
if (xhr.responseText !== "") {
var caption, previous_start, start, end,
captions = new DOMParser().parseFromString(xhr.responseText, "text/xml").getElementsByTagName('text'),
textarea = document.createElement("textarea"),
output_format = FORMATS[document.getElementById(FORMAT_SELECTOR_ID).value] || FORMATS['srt'],
srt_output = '';
for (var i = 0, il = captions.length; i < il; i++) {
caption = captions[i];
start = +caption.getAttribute('start');
if (0 <= previous_start) {
textarea.innerHTML = captions[i - 1].textContent.replace(/</g, "<").
replace( />/g, ">" );
if (output_format === FORMATS['text']) {
srt_output += textarea.value + "\n";
} else {
srt_output += (i + 1) + "\n" + makeTimeline(previous_start) + ' --> ' +
makeTimeline(start) + "\n" + textarea.value + "\n\n";
}
previous_start = null;
}
if (end = +caption.getAttribute('dur')) {
end = start + end;
} else {
if (captions[i + 1]) {
previous_start = start;
continue;
}
end = PLAYER.getDuration();
}
textarea.innerHTML = caption.textContent.replace(/</g, "<").replace(/>/g, ">");
if (output_format === FORMATS['text']) {
srt_output += textarea.value + "\n";
} else {
srt_output += (i + 1) + "\n" + makeTimeline(start) + ' --> ' +
makeTimeline(end) + "\n" + textarea.value + "\n\n";
}
}
textarea = null;
GM_openInTab("data:text/srt;charset=utf-8," + encodeURIComponent(srt_output));
} else {
alert("Error: No response from server.");
}
selector.options[0].selected = true;
}
});
}
function loadCaptions (select) {
GM_xmlhttpRequest({
method: 'GET',
url: 'http://video.google.com/timedtext?hl=en&v=' + VIDEO_ID + '&type=list',
onload: function( xhr ) {
var caption, option, caption_info,
captions = new DOMParser().parseFromString(xhr.responseText, "text/xml").
getElementsByTagName('track');
if (captions.length === 0) {
return select.options[0].textContent = 'No captions.';
}
for (var i = 0, il = captions.length; i < il; i++) {
caption = captions[i];
option = document.createElement('option');
caption_info = {
name: caption.getAttribute('name'),
lang_code: caption.getAttribute('lang_code'),
lang_name: caption.getAttribute('lang_translated')
};
caption_array.push(caption_info);
option.textContent = caption_info.lang_name;
select.appendChild(option);
}
select.options[0].textContent = 'Download captions.';
select.disabled = false;
}
});
}
function loadFormats (select) {
var type
for (type in FORMATS) {
option = document.createElement('option');
option.value = type;
option.textContent = FORMATS[type];
select.appendChild(option);
}
select.options[0].textContent = 'Select caption format.';
select.disabled = false;
}
(function () {
var div = document.createElement('div'),
select = document.createElement('select'),
option = document.createElement('option'),
controls = document.getElementById('watch7-headline');
div.setAttribute( 'style', 'display: inline-block;' );
select.id = 'captions_selector';
select.disabled = true;
option.textContent = 'Loading...';
option.selected = true;
select.appendChild(option);
select.addEventListener('change', function() {
loadCaption(this);
}, false);
div.appendChild(select);
var format_div = document.createElement('div'),
format_select = document.createElement('select'),
format_option = document.createElement('option');
format_div.setAttribute('style', 'display: inline-block;');
format_select.id = FORMAT_SELECTOR_ID;
format_select.disabled = true;
format_option.textContent = 'Loading...';
format_option.selected = true;
format_select.appendChild(format_option);
format_div.appendChild(format_select);
controls.appendChild(format_div);
controls.appendChild(div);
loadFormats(format_select);
loadCaptions(select);
})();
