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以 ASS 格式下载 AcFun 的弹幕
- // ==UserScript==// @name AcFun ASS Danmaku Downloader// @name:zh-CN AcFun ASS Danmaku Downloader// @name:zh-TW AcFun ASS Danmaku Downloader// @namespace https://github.com/tiansh, https://github.com/zhuzemin// @description 以 ASS 格式下载 AcFun 的弹幕// @description:zh-TW 以 ASS 格式下载 AcFun 的弹幕// @description:zh-CN 以 ASS 格式下载 AcFun 的弹幕// @include https://www.acfun.cn/v/*// @include https://www.acfun.cn/bangumi/*// @version 1.17// @grant GM_addStyle// @grant GM_xmlhttpRequest// @run-at document-start// @copyright 2014+, 田生, Modified by zhuzemin// @license Mozilla Public License 2.0; http://www.mozilla.org/MPL/2.0/// @license CC Attribution-ShareAlike 4.0 International; http://creativecommons.org/licenses/by-sa/4.0/// @connect-src danmu.aixifan.com// ==/UserScript==/** Common*/// 设置项var config = {'playResX': 560, // 屏幕分辨率宽（像素）'playResY': 420, // 屏幕分辨率高（像素）'fontlist': [ // 字形（会自动选择最前面一个可用的）'Microsoft YaHei UI','Microsoft YaHei','文泉驿正黑','STHeitiSC','黑体',],'font_size': 1.0, // 字号（比例）'r2ltime': 8, // 右到左弹幕持续时间（秒）'fixtime': 4, // 固定弹幕持续时间（秒）'opacity': 0.6, // 不透明度（比例）'space': 0, // 弹幕间隔的最小水平距离（像素）'max_delay': 6, // 最多允许延迟几秒出现弹幕'bottom': 50, // 底端给字幕保留的空间（像素）'use_canvas': null, // 是否使用canvas计算文本宽度（布尔值，Linux下的火狐默认否，其他默认是，Firefox bug #561361）'debug': false, // 打印调试信息};var debug = config.debug && console && console.log && console.log.bind(console) || function () { };// 将字典中的值填入字符串var fillStr = function (str) {var dict = Array.apply(Array, arguments);return str.replace(/{{([^}]+)}}/g, function (r, o) {var ret;dict.some(function (i) { return ret = i[o]; });return ret || '';});};// 将颜色的数值化为十六进制字符串表示var RRGGBB = function (color) {var t = Number(color).toString(16).toUpperCase();return Array(7 - t.length).join('0') + t;};// 将可见度转换为透明度var hexAlpha = function (opacity) {var alpha = Math.round(0xFF * (1 - opacity)).toString(16).toUpperCase();return Array(3 - alpha.length).join('0') + alpha;};// 字符串var funStr = function (fun) {return fun.toString().split(/\r\n|\n|\r/).slice(1, -1).join('\n');};// 平方和开根var hypot = Math.hypot ? Math.hypot.bind(Math) : function () {return Math.sqrt([0].concat(Array.apply(Array, arguments)).reduce(function (x, y) { return x + y * y; }));};// 创建下载var startDownload = function (data, filename) {var blob = new Blob([data], { type: 'application/octet-stream' });var url = window.URL.createObjectURL(blob);var saveas = document.createElement('a');saveas.href = url;saveas.style.display = 'none';document.body.appendChild(saveas);saveas.download = filename;saveas.click();setTimeout(function () { saveas.parentNode.removeChild(saveas); }, 0)document.addEventListener('unload', function () { window.URL.revokeObjectURL(url); });};// 计算文字宽度var calcWidth = (function () {// 使用Canvas计算var calcWidthCanvas = function () {var canvas = document.createElement("canvas");var context = canvas.getContext("2d");return function (fontname, text, fontsize) {context.font = 'bold ' + fontsize + 'px ' + fontname;return Math.ceil(context.measureText(text).width + config.space);};}// 使用Div计算var calcWidthDiv = function () {var d = document.createElement('div');d.setAttribute('style', ['all: unset', 'top: -10000px', 'left: -10000px','width: auto', 'height: auto', 'position: absolute','', ].join(' !important; '));var ld = function () { document.body.parentNode.appendChild(d); }if (!document.body) document.addEventListener('DOMContentLoaded', ld);else ld();return function (fontname, text, fontsize) {d.textContent = text;d.style.font = 'bold ' + fontsize + 'px ' + fontname;return d.clientWidth + config.space;};};// 检查使用哪个测量文字宽度的方法if (config.use_canvas === null) {if (navigator.platform.match(/linux/i) &&!navigator.userAgent.match(/chrome/i)) config.use_canvas = false;}debug('use canvas: %o', config.use_canvas !== false);if (config.use_canvas === false) return calcWidthDiv();return calcWidthCanvas();}());// 选择合适的字体var choseFont = function (fontlist) {// 检查这个字串的宽度来检查字体是否存在var sampleText ='The quick brown fox jumps over the lazy dog' +'7531902468' + ',.!-' + '，。：！' +'天地玄黄' + '則近道矣';// 和这些字体进行比较var sampleFont = ['monospace', 'sans-serif', 'sans','Symbol', 'Arial', 'Comic Sans MS', 'Fixed', 'Terminal','Times', 'Times New Roman','宋体', '黑体', '文泉驿正黑', 'Microsoft YaHei'];// 如果被检查的字体和基准字体可以渲染出不同的宽度// 那么说明被检查的字体总是存在的var diffFont = function (base, test) {var baseSize = calcWidth(base, sampleText, 72);var testSize = calcWidth(test + ',' + base, sampleText, 72);return baseSize !== testSize;};var validFont = function (test) {var valid = sampleFont.some(function (base) {return diffFont(base, test);});debug('font %s: %o', test, valid);return valid;};// 找一个能用的字体var f = fontlist[fontlist.length - 1];fontlist = fontlist.filter(validFont);debug('fontlist: %o', fontlist);return fontlist[0] || f;};// 从备选的字体中选择一个机器上提供了的字体var initFont = (function () {var done = false;return function () {if (done) return; done = true;calcWidth = calcWidth.bind(window,config.font = choseFont(config.fontlist));};}());var generateASS = function (danmaku, info) {var assHeader = fillStr(funStr(function () {/*! ASS弹幕文件文件头[Script Info]Title: {{title}}Original Script: 根据 {{ori}} 的弹幕信息，由 https://github.com/tiansh/us-danmaku 生成ScriptType: v4.00+Collisions: NormalPlayResX: {{playResX}}PlayResY: {{playResY}}Timer: 10.0000[V4+ Styles]Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, EncodingStyle: Fix,{{font}},25,&H{{alpha}}FFFFFF,&H{{alpha}}FFFFFF,&H{{alpha}}000000,&H{{alpha}}000000,1,0,0,0,100,100,0,0,1,2,0,2,20,20,2,0Style: R2L,{{font}},25,&H{{alpha}}FFFFFF,&H{{alpha}}FFFFFF,&H{{alpha}}000000,&H{{alpha}}000000,1,0,0,0,100,100,0,0,1,2,0,2,20,20,2,0[Events]Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text*/}), config, info, { 'alpha': hexAlpha(config.opacity) });// 补齐数字开头的0var paddingNum = function (num, len) {num = '' + num;while (num.length < len) num = '0' + num;return num;};// 格式化时间var formatTime = function (time) {time = 100 * time ^ 0;var l = [[100, 2], [60, 2], [60, 2], [Infinity, 0]].map(function (c) {var r = time % c[0];time = (time - r) / c[0];return paddingNum(r, c[1]);}).reverse();return l.slice(0, -1).join(':') + '.' + l[3];};// 格式化特效var format = (function () {// 适用于所有弹幕var common = function (line) {var s = '';var rgb = line.color.split(/(..)/).filter(function (x) { return x; }).map(function (x) { return parseInt(x, 16); });// 如果不是白色，要指定弹幕特殊的颜色if (line.color !== 'FFFFFF') // line.color 是 RRGGBB 格式s += '\\c&H' + line.color.split(/(..)/).reverse().join('');// 如果弹幕颜色比较深，用白色的外边框var dark = rgb[0] * 0.299 + rgb[1] * 0.587 + rgb[2] * 0.114 < 0x30;if (dark) s += '\\3c&HFFFFFF';if (line.size !== 25) s += '\\fs' + line.size;return s;};// 适用于从右到左弹幕var r2l = function (line) {return '\\move(' + [line.poss.x, line.poss.y, line.posd.x, line.posd.y].join(',') + ')';};// 适用于固定位置弹幕var fix = function (line) {return '\\pos(' + [line.poss.x, line.poss.y].join(',') + ')';};var withCommon = function (f) {return function (line) { return f(line) + common(line); };};return {'R2L': withCommon(r2l),'Fix': withCommon(fix),};}());// 转义一些字符var escapeAssText = function (s) {// "{"、"}"字符libass可以转义，但是VSFilter不可以，所以直接用全角补上return s.replace(/{/g, '｛').replace(/}/g, '｝').replace(/\r|\n/g, '');};// 将一行转换为ASS的事件var convert2Ass = function (line) {return 'Dialogue: ' + [0,formatTime(line.stime),formatTime(line.dtime),line.type,',20,20,2,,',].join(',')+ '{' + format[line.type](line) + '}'+ escapeAssText(line.text);};return assHeader +danmaku.map(convert2Ass).filter(function (x) { return x; }).join('\n');};/*下文字母含义：0 ||----------------------x---------------------->_____________________c_____________________= / wc \ 0| | |--v--| wv | |--v--|| d |--v--| d f |--v--|y |--v--| l f | s _ p| | VIDEO |--v--| |--v--| _ mv | AREA (x ^ y) |v: 弹幕c: 屏幕0: 弹幕发送a: 可行方案s: 开始出现f: 出现完全l: 开始消失d: 消失完全p: 上边缘（含）m: 下边缘（不含）w: 宽度h: 高度b: 底端保留t: 时间点u: 时间段r: 延迟并规定ts := t0s + rtf := wv / (wc + ws) * p + tstl := ws / (wc + ws) * p + tstd := p + ts*/// 滚动弹幕var normalDanmaku = (function (wc, hc, b, u, maxr) {return function () {// 初始化屏幕外面是不可用的var used = [{ 'p': -Infinity, 'm': 0, 'tf': Infinity, 'td': Infinity, 'b': false },{ 'p': hc, 'm': Infinity, 'tf': Infinity, 'td': Infinity, 'b': false },{ 'p': hc - b, 'm': hc, 'tf': Infinity, 'td': Infinity, 'b': true },];// 检查一些可用的位置var available = function (hv, t0s, t0l, b) {var suggestion = [];// 这些上边缘总之别的块的下边缘used.forEach(function (i) {if (i.m > hc) return;var p = i.m;var m = p + hv;var tas = t0s;var tal = t0l;// 这些块的左边缘总是这个区域里面最大的边缘used.forEach(function (j) {if (j.p >= m) return;if (j.m <= p) return;if (j.b && b) return;tas = Math.max(tas, j.tf);tal = Math.max(tal, j.td);});// 最后作为一种备选留下来suggestion.push({'p': p,'r': Math.max(tas - t0s, tal - t0l),});});// 根据高度排序suggestion.sort(function (x, y) { return x.p - y.p; });var mr = maxr;// 又靠右又靠下的选择可以忽略，剩下的返回suggestion = suggestion.filter(function (i) {if (i.r >= mr) return false;mr = i.r;return true;});return suggestion;};// 添加一个被使用的var use = function (p, m, tf, td) {used.push({ 'p': p, 'm': m, 'tf': tf, 'td': td, 'b': false });};// 根据时间同步掉无用的var syn = function (t0s, t0l) {used = used.filter(function (i) { return i.tf > t0s || i.td > t0l; });};// 给所有可能的位置打分，分数是[0, 1)的var score = function (i) {if (i.r > maxr) return -Infinity;return 1 - hypot(i.r / maxr, i.p / hc) * Math.SQRT1_2;};// 添加一条return function (t0s, wv, hv, b) {var t0l = wc / (wv + wc) * u + t0s;syn(t0s, t0l);var al = available(hv, t0s, t0l, b);if (!al.length) return null;var scored = al.map(function (i) { return [score(i), i]; });var best = scored.reduce(function (x, y) {return x[0] > y[0] ? x : y;})[1];var ts = t0s + best.r;var tf = wv / (wv + wc) * u + ts;var td = u + ts;use(best.p, best.p + hv, tf, td);return {'top': best.p,'time': ts,};};};}(config.playResX, config.playResY, config.bottom, config.r2ltime, config.max_delay));// 顶部、底部弹幕var sideDanmaku = (function (hc, b, u, maxr) {return function () {var used = [{ 'p': -Infinity, 'm': 0, 'td': Infinity, 'b': false },{ 'p': hc, 'm': Infinity, 'td': Infinity, 'b': false },{ 'p': hc - b, 'm': hc, 'td': Infinity, 'b': true },];// 查找可用的位置var fr = function (p, m, t0s, b) {var tas = t0s;used.forEach(function (j) {if (j.p >= m) return;if (j.m <= p) return;if (j.b && b) return;tas = Math.max(tas, j.td);});return { 'r': tas - t0s, 'p': p, 'm': m };};// 顶部var top = function (hv, t0s, b) {var suggestion = [];used.forEach(function (i) {if (i.m > hc) return;suggestion.push(fr(i.m, i.m + hv, t0s, b));});return suggestion;};// 底部var bottom = function (hv, t0s, b) {var suggestion = [];used.forEach(function (i) {if (i.p < 0) return;suggestion.push(fr(i.p - hv, i.p, t0s, b));});return suggestion;};var use = function (p, m, td) {used.push({ 'p': p, 'm': m, 'td': td, 'b': false });};var syn = function (t0s) {used = used.filter(function (i) { return i.td > t0s; });};// 挑选最好的方案：延迟小的优先，位置不重要var score = function (i, is_top) {if (i.r > maxr) return -Infinity;var f = function (p) { return is_top ? p : (hc - p); };return 1 - (i.r / maxr * (31 / 32) + f(i.p) / hc * (1 / 32));};return function (t0s, hv, is_top, b) {syn(t0s);var al = (is_top ? top : bottom)(hv, t0s, b);if (!al.length) return null;var scored = al.map(function (i) { return [score(i, is_top), i]; });var best = scored.reduce(function (x, y) {return x[0] > y[0] ? x : y;})[1];use(best.p, best.m, best.r + t0s + u)return { 'top': best.p, 'time': best.r + t0s };};};}(config.playResY, config.bottom, config.fixtime, config.max_delay));// 为每条弹幕安置位置var setPosition = function (danmaku) {var normal = normalDanmaku(), side = sideDanmaku();return danmaku.sort(function (x, y) { return x.time - y.time; }).map(function (line) {var font_size = Math.round(line.size * config.font_size);var width = calcWidth(line.text, font_size);switch (line.mode) {case 'R2L': return (function () {var pos = normal(line.time, width, font_size, line.bottom);if (!pos) return null;line.type = 'R2L';line.stime = pos.time;line.poss = {'x': config.playResX + width / 2,'y': pos.top + font_size,};line.posd = {'x': -width / 2,'y': pos.top + font_size,};line.dtime = config.r2ltime + line.stime;return line;}());case 'TOP': case 'BOTTOM': return (function (isTop) {var pos = side(line.time, font_size, isTop, line.bottom);if (!pos) return null;line.type = 'Fix';line.stime = pos.time;line.posd = line.poss = {'x': Math.round(config.playResX / 2),'y': pos.top + font_size,};line.dtime = config.fixtime + line.stime;return line;}(line.mode === 'TOP'));default: return null;};}).filter(function (l) { return l; }).sort(function (x, y) { return x.stime - y.stime; });};/** AcFun*/// 添加图标样式var addStyle = function () {GM_addStyle(funStr(function () {/*!#area-title-view .r #btn-danmaku-view .img { background-image: url(data:image/png;base64,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); }#area-title-view .l { margin-right: -80px; }#btn-danmaku-toolbar { border-left: 1px solid #eee; border-right: 1px solid #eee; color: #666; cursor: pointer; float: left; height: 18px; line-height: 18px; margin-left: -13px; margin-right: 12px; margin-top: 11px; padding: 0 12px; }*/}));};// 获取弹幕idvar getVid = function (callback) {var player, m, vid = null;try {if(window.location.href.includes("bangumi")){vid=unsafeWindow.pageInfo.videoId;}else{vid=unsafeWindow.pageInfo.currentVideoId;}/*player = document.querySelector('iframe#ACFlashPlayer-re');m = player.src.match(/vid=(\d+)/);vid = Number(m[1]);*/} catch (e) { }if (!vid) try {player = document.querySelector('object#ACFlashPlayer-re');m = player.querySelector('param[name="flashvars"]').getAttribute('value').match(/videoId=(\d+)/);vid = Number(m[1]);} catch (e) { }if (!vid) setTimeout(function () {getVid(callback);}, 1000); else callback(vid);};// 通过弹幕id获取弹幕内容// 弹幕内容是A站直接提供的数据var requestDanmaku = function (vid, page, callback) {GM_xmlhttpRequest({'method': 'GET','url': 'http://danmu.aixifan.com/V2/' + vid + '?pageSize=500&pageNo=' + page,'onload': function (resp) {var data;try {data = JSON.parse(resp.responseText);data = data.reduce(function (x, y) { return x.concat(y); }, []);} catch (e) { data = null; }if (!data || typeof data.length !== 'number') callback(vid);else callback(vid, data);},'onerror': function () {callback(vid);},});};var getDanmaku = function (vid, callback) {var danmaku = [];(function collectDanmaku(i) {requestDanmaku(vid, i, function (vid, data) {if (!data || !data.length) {return callback(vid, danmaku);}danmaku = danmaku.concat(data);collectDanmaku(i + 1);});}(1));};// 将弹幕内容转换为程序内部的表达方式var mina = function (vid, danmaku) {danmaku = danmaku.map(function (line) {var info = line.c.split(','), text = line.m;return {'text': text,'time': Number(info[0]),'color': RRGGBB(Number(info[1])),'mode': [undefined, 'R2L', undefined, undefined, 'BOTTOM', 'TOP'][Number(info[2])],'size': Number(info[3]),'bottom': false,// 'sender': String(info[4]),// 'create': new Date(Number(info[5]) * 1000),// 'danmakuid': info[6], // format as uuid};});var name;try { name = document.querySelector('h1.title').textContent; }catch (e) { name = '' + vid; }var ass = generateASS(setPosition(danmaku), {'title': document.title,'ori': location.href,});startDownload('\ufeff' + ass, name + '.ass');};// 显示按钮var showButton = function (vid, danmaku) {if (!danmaku) return;var click = function (e) {e.preventDefault();getDanmaku(vid, function (vid, danmaku0) {mina(vid, danmaku0 || danmaku);});};var n = danmaku.length.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');;//var r = document.querySelector('#area-title-view .r'), d;var r = document.querySelector('body'), d;if (r) {d = document.createElement('div');d.innerHTML = '<a class="toolbar" id="btn-danmaku-view"><div class="img"></div><p>弹幕</p><span class="pts">' + n + '</span></a>';d.firstChild.addEventListener('click', click);//r.insertBefore(d.firstChild, r.firstChild);}//var l = document.querySelector('#area-toolbar-view .l');var l = document.querySelector('body');if (l) {var t = l.querySelector('#txt-info-title') || null;d = document.createElement('div');d.innerHTML = '<div id="btn-danmaku-toolbar" class="a toolbar"><p>弹幕下载</p><span class="pts">'+n+'</span></div>';d.firstChild.addEventListener('click', click);l.insertBefore(d.firstChild, t);}};// 初始化按钮var initButton = function () {addStyle();getVid(function (vid) {getDanmaku(vid, showButton);});};/** Common*/// 初始化var init = function () {initFont();initButton();};if (document.body) init();else window.addEventListener('DOMContentLoaded', init);