// ==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: Normal
PlayResX: {{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, Encoding
Style: Fix,{{font}},25,&H{{alpha}}FFFFFF,&H{{alpha}}FFFFFF,&H{{alpha}}000000,&H{{alpha}}000000,1,0,0,0,100,100,0,0,1,2,0,2,20,20,2,0
Style: 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0
var 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--| _ m
v | 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 + r
tf := wv / (wc + ws) * p + ts
tl := ws / (wc + ws) * p + ts
td := 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id
var 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);
