// ==UserScript==
// @name           Youtube 翻译中文字幕下载 v14
// @description Youtube 播放器右下角有个 Auto-tranlsate，可以把视频字幕翻成中文。这个脚本是下载这个中文字幕
// @include        https://*youtube.com/*
// @author         Cheng Zheng
// @license        MIT
// @require        https://code.jquery.com/jquery-1.12.4.min.js
// @version        14
// @grant          GM_xmlhttpRequest
// @grant          unsafeWindow
// @namespace      https://greasyfork.org/users/5711
// ==/UserScript==
/*
作者: 郑诚
邮箱:  [email protected]
Github: https://github.com/1c7/Youtube-Auto-Subtitle-Download
测试视频:
https://www.youtube.com/watch?v=nGlQkaoIfBI   1门语言
https://www.youtube.com/watch?v=O5nskjZ_GoI   13门语言
https://www.youtube.com/watch?v=VfEz3DIbkvo   测试自动字幕（西班牙语）
https://www.youtube.com/watch?v=WSnKbcfsT1E
更新日志：
2022-12-23 v13 -> v14
修复按钮不出现的问题。
*/
;
(function () {
// 配置项
const NO_SUBTITLE = '无字幕';
const HAVE_SUBTITLE = '下载翻译的中文字幕';
const TEXT_LOADING = '载入中...';
const BUTTON_ID = 'youtube-translate-to-chinese-subtitle-downloader-by-1c7'
const anchor_element = "#above-the-fold #title";
// 配置项
var HASH_BUTTON_ID = `#${BUTTON_ID}`
var first_load = true;
// trigger when loading new page (actually this would also trigger when first loading, that's not what we want, that's why we need to use firsr_load === false)
// (new Material design version would trigger this "yt-navigate-finish" event. old version would not.)
var body = document.getElementsByTagName("body")[0];
body.addEventListener("yt-navigate-finish", function (event) {
if (first_load === false) {
remove_subtitle_download_button();
init();
}
});
// trigger when loading new page
// (old version would trigger this "spfdone" event. new Material design version not sure yet.)
window.addEventListener("spfdone", function (e) {
if (current_page_is_video_page()) {
remove_subtitle_download_button();
init();
}
});
// return true / false
function current_page_is_video_page() {
return get_video_id() !== null;
}
// return string like "RW1ChiWyiZQ",  from "https://www.youtube.com/watch?v=RW1ChiWyiZQ"
// or null
function get_video_id() {
return getURLParameter('v');
}
//https://stackoverflow.com/questions/11582512/how-to-get-url-parameters-with-javascript/11582513#11582513
function getURLParameter(name) {
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [null, ''])[1].replace(/\+/g, '%20')) || null;
}
function remove_subtitle_download_button() {
$(HASH_BUTTON_ID).remove();
}
function inject_our_script() {
var div = document.createElement('div'),
select = document.createElement('select'),
option = document.createElement('option');
div.setAttribute('style', `display: table;
margin-top:4px;
border: 1px solid rgb(0, 183, 90);
cursor: pointer; color: rgb(255, 255, 255);
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
background-color: #00B75A;
padding: 3px;
padding-right: 8px;
`);
div.id = BUTTON_ID;
select.id = 'captions_selector';
select.disabled = true;
select.setAttribute('style', 'display:block; border: 1px solid rgb(0, 183, 90); cursor: pointer; color: rgb(255, 255, 255); background-color: #00B75A;');
option.textContent = TEXT_LOADING;
option.selected = true;
select.appendChild(option);
// 下拉菜单中选择后的事件侦听
select.addEventListener('change', function () {
download_subtitle(this);
}, false);
div.appendChild(select);
// put <select> into <div>
// put the div into page: new material design
var title_element = document.querySelectorAll('.title.style-scope.ytd-video-primary-info-renderer');
if (title_element) {
$(title_element[0]).after(div);
}
// 把按钮加到页面上。
document.querySelector(anchor_element).appendChild(div)
load_language_list(select);
// <a> element is for download
var a = document.createElement('a');
a.style.cssText = 'display:none;';
a.setAttribute("id", "ForSubtitleDownload");
var body = document.getElementsByTagName('body')[0];
body.appendChild(a);
}
// Trigger when user select <option>
async function download_subtitle(selector) {
// if user select first <option>, we just return, do nothing.
if (selector.selectedIndex == 0) {
return;
}
var caption = caption_array[selector.selectedIndex - 1]; // because first <option> is for display, so index-1
if (!caption) return;
var lang_code = caption.lang_code;
var lang_name = caption.lang_name;
// if user choose auto subtitle // 如果用户选的是自动字幕
if (caption.lang_code == 'AUTO') {
var file_name = get_file_name(lang_name);
download_auto_subtitle(file_name);
selector.options[0].selected = true; // after download, select first <option>
return
}
// 如果用户选的是完整字幕
// 原文
// sub mean "subtitle"
var sub_original_url = await get_closed_subtitle_url(lang_code)
// 中文
var sub_translated_url = sub_original_url + "&tlang=" + "zh-Hans"
var sub_translated_xml = await get(sub_translated_url);
var sub_translated_srt = parse_youtube_XML_to_object_list(sub_translated_xml)
var srt_string = object_array_to_SRT_string(sub_translated_srt)
var title = get_file_name(lang_name);
downloadString(srt_string, "text/plain", title);
// after download, select first <option>
selector.options[0].selected = true;
}
// Return something like: "(English)How Did Python Become A Data Science Powerhouse?.srt"
function get_file_name(x) {
return `(${x})${get_title()}.srt`;
}
// 载入有多少种语言, 然后加到 <select> 里
function load_language_list(select) {
// auto
var auto_subtitle_exist = false;
// closed
var closed_subtitle_exist = false;
// get auto subtitle
var auto_subtitle_url = get_auto_subtitle_xml_url();
if (auto_subtitle_url != false) {
auto_subtitle_exist = true;
}
var captionTracks = get_captionTracks()
if (captionTracks != undefined && typeof captionTracks === 'object' && captionTracks.length > 0) {
closed_subtitle_exist = true;
}
// if no subtitle at all, just say no and stop
if (auto_subtitle_exist == false && closed_subtitle_exist == false) {
select.options[0].textContent = NO_SUBTITLE;
disable_download_button();
return false;
}
// if at least one type of subtitle exist
select.options[0].textContent = HAVE_SUBTITLE;
select.disabled = false;
// if at least one type of subtitle exist
select.options[0].textContent = HAVE_SUBTITLE;
select.disabled = false;
var caption = null; // for inside loop
var option = null; // for <option>
var caption_info = null; // for our custom object
// 自动字幕
if (auto_subtitle_exist) {
var auto_sub_name = get_auto_subtitle_name()
var lang_name = `${auto_sub_name} 翻译成 中文`
caption_info = {
lang_code: 'AUTO', // later we use this to know if it's auto subtitle
lang_name: lang_name // for display only
};
caption_array.push(caption_info);
option = document.createElement('option');
option.textContent = caption_info.lang_name;
select.appendChild(option);
}
// if closed_subtitle_exist
if (closed_subtitle_exist) {
for (var i = 0, il = captionTracks.length; i < il; i++) {
var caption = captionTracks[i];
if (caption.kind == 'asr') {
continue
}
let lang_code = caption.languageCode
let lang_translated = caption.name.simpleText
var lang_name = `${lang_code_to_local_name(lang_code, lang_translated)} 翻译成 中文`
caption_info = {
lang_code: lang_code, // for AJAX request
lang_name: lang_name, // display to user
};
caption_array.push(caption_info);
// 注意这里是加到 caption_array, 一个全局变量, 待会要靠它来下载
option = document.createElement('option');
option.textContent = caption_info.lang_name;
select.appendChild(option);
}
}
}
// 处理时间. 比如 start="671.33"  start="37.64"  start="12" start="23.029"
// 处理成 srt 时间, 比如 00:00:00,090    00:00:08,460    00:10:29,350
function process_time(s) {
s = s.toFixed(3);
// 超棒的函数, 不论是整数还是小数都给弄成3位小数形式
// 举个柚子:
// 671.33 -> 671.330
// 671 -> 671.000
// 注意函数会四舍五入. 具体读文档
var array = s.split('.');
// 把开始时间根据句号分割
// 671.330 会分割成数组: [671, 330]
var Hour = 0;
var Minute = 0;
var Second = array[0]; // 671
var MilliSecond = array[1]; // 330
// 先声明下变量, 待会把这几个拼好就行了
// 我们来处理秒数.  把"分钟"和"小时"除出来
if (Second >= 60) {
Minute = Math.floor(Second / 60);
Second = Second - Minute * 60;
// 把 秒 拆成 分钟和秒, 比如121秒, 拆成2分钟1秒
Hour = Math.floor(Minute / 60);
Minute = Minute - Hour * 60;
// 把 分钟 拆成 小时和分钟, 比如700分钟, 拆成11小时40分钟
}
// 分钟，如果位数不够两位就变成两位，下面两个if语句的作用也是一样。
if (Minute < 10) {
Minute = '0' + Minute;
}
// 小时
if (Hour < 10) {
Hour = '0' + Hour;
}
// 秒
if (Second < 10) {
Second = '0' + Second;
}
return Hour + ':' + Minute + ':' + Second + ',' + MilliSecond;
}
// https://css-tricks.com/snippets/javascript/unescape-html-in-js/
// turn HTML entity back to text, example: &quot; should be "
function htmlDecode(input) {
var e = document.createElement('div');
e.class = 'dummy-element-for-tampermonkey-Youtube-Subtitle-Downloader-script-to-decode-html-entity';
e.innerHTML = input;
return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
}
// return URL or null;
// later we can send a AJAX and get XML subtitle
function get_auto_subtitle_xml_url() {
try {
var captionTracks = get_captionTracks()
for (var index in captionTracks) {
var caption = captionTracks[index];
if (typeof caption.kind === 'string' && caption.kind == 'asr') {
return captionTracks[index].baseUrl;
}
// ASR – A caption track generated using automatic speech recognition.
// https://developers.google.com/youtube/v3/docs/captions
}
return false;
} catch (error) {
return false;
}
}
function disable_download_button() {
$(HASH_BUTTON_ID)
.css('border', '#95a5a6')
.css('cursor', 'not-allowed')
.css('background-color', '#95a5a6');
$('#captions_selector')
.css('border', '#95a5a6')
.css('cursor', 'not-allowed')
.css('background-color', '#95a5a6');
if (new_material_design_version()) {
$(HASH_BUTTON_ID).css('padding', '6px');
} else {
$(HASH_BUTTON_ID).css('padding', '5px');
}
}
// 下载自动字幕的中英双语
// 输入: file_name: 保存的文件名
// 输出: 无 (会触发浏览器下载一个文件)
async function download_auto_subtitle(file_name) {
var auto_sub_url = get_auto_subtitle_xml_url();
var format_json3_url = auto_sub_url + '&fmt=json3'
var cn_url = format_json3_url + '&tlang=zh-Hans'
var cn_srt = await auto_sub_in_chinese_fmt_json3_to_srt(cn_url)
var srt_string = to_srt(cn_srt)
downloadString(srt_string, "text/plain", file_name);
}
function to_srt(srt_array) {
// var srt_array_item_example = {
//   "startTime": "00:00:06,640",
//   "endTime": "00:00:09,760",
//   "text": "在与朋友的长时间交谈中以及与陌生人的简短交谈中",
//   "tStartMs": 6640,
//   "dDurationMs": 3120,
//   "words": ["in", " a", " long", " conversation", " with", " a", " friend", " and", "a", " short", " chat", " with", " a", " stranger", "the", " endless", " streams"]
// }
var r###lt_array = []
for (let i = 0; i < srt_array.length; i++) {
const line = srt_array[i];
var text = line.text; // 中文
var item = {
startTime: line.startTime,
endTime: line.endTime,
text: text
}
r###lt_array.push(item)
}
var srt_string = object_array_to_SRT_string(r###lt_array)
return srt_string
}
// return "English (auto-generated)" or a default name;
function get_auto_subtitle_name() {
const name = "自动字幕"
try {
var captionTracks = get_captionTracks()
for (var index in captionTracks) {
var caption = captionTracks[index];
if (typeof caption.kind === 'string' && caption.kind == 'asr') {
return captionTracks[index].name.simpleText;
}
}
return name;
} catch (error) {
console.log(error);
return name;
}
}
// Usage: var r###lt = await get(url)
function get(url) {
return $.ajax({
url: url,
type: 'get',
success: function (r) {
return r
},
fail: function (error) {
return error
}
});
}
// 输入: url (String)
// 输出: SRT (Array)
async function auto_sub_in_chinese_fmt_json3_to_srt(url) {
var srt_array = []
var json = await get(url);
var events = json.events;
for (let index = 0; index < events.length; index++) {
const event = events[index];
if (event.segs === undefined) {
continue
}
if (event.segs.length === 1 && event.segs[0].utf8 === '\n') {
continue
}
var tStartMs = event.tStartMs
var dDurationMs = event.dDurationMs
var segs = event.segs
var text = segs.map(seg => seg.utf8).join("")
var item = {
startTime: ms_to_srt(tStartMs),
endTime: ms_to_srt(tStartMs + dDurationMs),
text: text,
tStartMs: tStartMs,
dDurationMs: dDurationMs,
}
srt_array.push(item);
}
return srt_array
}
// 毫秒转成 srt 时间
function ms_to_srt($milliseconds) {
var $seconds = Math.floor($milliseconds / 1000);
var $minutes = Math.floor($seconds / 60);
var $hours = Math.floor($minutes / 60);
var $milliseconds = $milliseconds % 1000;
var $seconds = $seconds % 60;
var $minutes = $minutes % 60;
return ($hours < 10 ? '0' : '') + $hours + ':' +
($minutes < 10 ? '0' : '') + $minutes + ':' +
($seconds < 10 ? '0' : '') + $seconds + ',' +
($milliseconds < 100 ? '0' : '') + ($milliseconds < 10 ? '0' : '') + $milliseconds;
}
/*
Input: [ {startTime: "", endTime: "", text: ""}, {...}, {...} ]
Output: SRT
*/
function object_array_to_SRT_string(object_array) {
var r###lt = '';
var BOM = '\uFEFF';
r###lt = BOM + r###lt; // store final SRT r###lt
for (var i = 0; i < object_array.length; i++) {
var item = object_array[i]
var index = i + 1;
var start_time = item.startTime
var end_time = item.endTime
var text = item.text
var new_line = "\n";
r###lt = r###lt + index + new_line;
r###lt = r###lt + start_time;
r###lt = r###lt + ' --> ';
r###lt = r###lt + end_time + new_line;
r###lt = r###lt + text + new_line + new_line;
}
return r###lt;
}
// Copy from: https://gist.github.com/danallison/3ec9d5314788b337b682
// Thanks! https://github.com/danallison
// Work in Chrome 66
// Test passed: 2018-5-19
function downloadString(text, fileType, fileName) {
var blob = new Blob([text], {
type: fileType
});
var a = document.createElement('a');
a.download = fileName;
a.href = URL.createObjectURL(blob);
a.dataset.downloadurl = [fileType, a.download, a.href].join(':');
a.style.display = "none";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
setTimeout(function () {
URL.revokeObjectURL(a.href);
}, 1500);
}
// Input: lang_code like 'en'
// Output: URL (String)
async function get_closed_subtitle_url(lang_code) {
try {
var captionTracks = get_captionTracks()
for (var index in captionTracks) {
var caption = captionTracks[index];
if (caption.languageCode === lang_code && caption.kind != 'asr') {
var url = captionTracks[index].baseUrl;
return url
}
}
} catch (error) {
console.log(error);
return false;
}
}
// Input: XML (provide by Youtube)
// Output: Array of object
// each object look like:
/*
{
startTime: "",
endTime: "",
text: ""
}
*/
// it's intermediate representation for SRT
function parse_youtube_XML_to_object_list(youtube_xml_string) {
if (youtube_xml_string === '' || youtube_xml_string === undefined || youtube_xml_string === null) {
return false;
}
var r###lt_array = []
var text_nodes = youtube_xml_string.getElementsByTagName('text');
var len = text_nodes.length;
for (var i = 0; i < len; i++) {
var text = text_nodes[i].textContent.toString();
text = text.replace(/(<([^>]+)>)/ig, ""); // remove all html tag.
text = htmlDecode(text);
var start = text_nodes[i].getAttribute('start');
var end = parseFloat(text_nodes[i].getAttribute('start')) + parseFloat(text_nodes[i].getAttribute('dur'));
// if (i + 1 >= len) {
//   end = parseFloat(text_nodes[i].getAttribute('start')) + parseFloat(text_nodes[i].getAttribute('dur'));
// } else {
//   end = text_nodes[i + 1].getAttribute('start');
// }
var start_time = process_time(parseFloat(start));
var end_time = process_time(parseFloat(end));
var item = {
startTime: start_time,
endTime: end_time,
text: text
}
r###lt_array.push(item)
}
return r###lt_array
}
function get_youtube_data() {
return document.getElementsByTagName("ytd-app")[0].data.playerResponse
}
function get_captionTracks() {
let data = get_youtube_data();
var captionTracks = data?.captions?.playerCaptionsTracklistRenderer?.captionTracks
return captionTracks
}
// Input a language code, output that language name in current locale
// 如果当前语言是中文简体, Input: "de" Output: 德语
// if current locale is English(US), Input: "de" Output: "Germany"
function lang_code_to_local_name(languageCode, fallback_name) {
try {
var captionTracks = get_captionTracks()
for (var i in captionTracks) {
var caption = captionTracks[i];
if (caption.languageCode === languageCode) {
let simpleText = captionTracks[i].name.simpleText;
if (simpleText) {
return simpleText
} else {
return fallback_name
}
}
}
} catch (error) {
return fallback_name
}
}
function get_title() {
return ytplayer.config.args.title;
}
const wait = (ms) => new Promise((resolve) => setTimeout(resolve, ms))
// 等待一个元素存在
// https://stackoverflow.com/questions/5525071/how-to-wait-until-an-element-exists
function waitForElm(selector) {
return new Promise((resolve) => {
if (document.querySelector(selector)) {
return resolve(document.querySelector(selector))
}
const observer = new MutationObserver((mutations) => {
if (document.querySelector(selector)) {
resolve(document.querySelector(selector))
observer.disconnect()
}
})
observer.observe(document.body, {
childList: true,
subtree: true,
})
})
}
function init() {
console.log('进入 init');
unsafeWindow.caption_array = [];
inject_our_script();
first_load = false;
}
async function main() {
console.log('进入 main');
await waitForElm(anchor_element)
init()
}
setTimeout(main, 2000);
})();