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捕获HTML视频流，并下载的实现。理论上可以捕获任意在线视频或直播的媒体流
// ==UserScript==
// @name 媒体流捕获
// @namespace https://github.com/Momo707577045/media-source-extract
// @version 0.2.7
// @description 捕获HTML视频流，并下载的实现。理论上可以捕获任意在线视频或直播的媒体流
// @license AGPL-3.0
// @author Momo707577045
// @match *://*/*
// @exclude http://blog.luckly-mjw.cn/tool-show/media-source-extract/player/player.html
// @grant none
// @run-at document-start
// ==/UserScript==
(function () {
'use strict';
(function () {
if (document.getElementById('media-source-extract')) {
return;
}
// 轮询监听 iframe 的加载
setInterval(() => {
try {
Array.prototype.forEach.call(document.getElementsByTagName('iframe'), (iframe) => {
// 若 iframe 使用了 sandbox 进行操作约束，删除原有 iframe，拷贝其备份，删除 sandbox 属性，重新载入
// 若 iframe 已载入，再修改 sandbox 属性，将修改无效。故通过新建 iframe 的方式绕过
if (iframe.hasAttribute('sandbox')) {
const parentNode = iframe.parentNode;
const tempIframe = iframe.cloneNode();
tempIframe.removeAttribute("sandbox");
iframe.remove();
parentNode.appendChild(tempIframe);
}
});
} catch (error) {
console.log(error);
}
}, 1000);
let downloadDate = new Date(); // 流下载时间标识
let isClose = false, isEndOfStream = false; // 是否关闭
let isStreamDownload = false; // 是否使用流式下载
let _sourceBufferList = []; // 媒体轨道
const $showBtn = document.createElement('div'); // 展示按钮
const $btnDownload = document.createElement('div'); // 下载按钮
const $btnStreamDownload = document.createElement('div'); // 流式下载按钮
const $downloadNum = document.createElement('div'); // 已捕获视频片段数
const $tenRate = document.createElement('div'); // 十倍速播放
const $closeBtn = document.createElement('div'); // 关闭
const $container = document.createElement('div'); // 容器
$closeBtn.innerHTML = `
<img style="
padding-top: 4px;
width: 24px;
display: inline-block;
cursor: pointer;
" src="data:image/png;base64,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">`;
$showBtn.innerHTML = `
<img style="
padding-top: 4px;
width: 24px;
display: inline-block;
cursor: pointer;
" src="data:image/png;base64,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"?`;
// 16倍速播放
function _tenRatePlay(rate) {
setTimeout(() => {
let $domList = document.querySelectorAll('*');
for (const $dom of $domList) {
try {
$dom.playbackRate = rate;
$dom.muted = rate !== 1;
} catch (e) {
// console.error(e.message);
}
}
});
}
// 获取顶部 window title，因可能存在跨域问题，故使用 try catch 进行保护
function getDocumentTitle() {
let title = document.title;
try {
title = window.top.document.title;
} catch (error) {
console.log(error);
}
return title;
}
var _htm = _htm || {};
(function () {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?1f12b0865d866ae1b93514870d93ce89";
var s = document.querySelector("script");
s.parentNode.insertBefore(hm, s);
})();
// 流式下载
function _streamDownload() {
// 对应状态未下载结束的媒体轨道
const remainSourceBufferList = [];
for (const target of _sourceBufferList) {
// 对应的 MSE 状态为已下载完成状态
if (target.MSEInstance.readyState === 'ended') {
target.streamWriter.close();
} else {
remainSourceBufferList.push(target);
}
}
// 流式下载，释放已下载完成的媒体轨道，回收内存
_sourceBufferList = remainSourceBufferList;
showTip('视频已下载');
// 重置状态
downloadDate = new Date();
isStreamDownload = false;
$btnDownload.style.display = $btnStreamDownload.style.display = 'block';
$downloadNum.innerHTML = `已捕获 0 个片段`;
isEndOfStream = false;
}
// 普通下载
function _download() {
const date = new Date();
for (const target of _sourceBufferList) {
const mime = target.mime.split(';')[0];
const type = mime.split("/");
const fileBlob = new Blob(target.bufferList, {type: mime}); // 创建一个Blob对象，并设置文件的 MIME 类型
const a = document.createElement('a');
a.download = `${type[0]}_${date.getFullYear().toString().padStart(4, '0')}${date.getMonth().toString().padStart(2, '0')}${date.getDay().toString().padStart(2, '0')}_${date.getHours().toString().padStart(2, '0')}${date.getMinutes().toString().padStart(2, '0')}${date.getSeconds().toString().padStart(2, '0')}.${type[1]}`;
a.href = URL.createObjectURL(fileBlob);
a.style.display = 'none';
document.body.appendChild(a);
// 禁止 click 事件冒泡，避免全局拦截
a.onclick = function (e) {
e.stopPropagation();
}
a.click();
a.remove();
if (isEndOfStream === true) {
_sourceBufferList = [];
$downloadNum.innerHTML = `已捕获 0 个片段`;
isEndOfStream = false;
showTip('视频已下载');
}
}
}
for (const property of Object.getOwnPropertyNames(window)) {
if (typeof window[property] === "function" && Boolean(window[property].prototype) && typeof window[property].prototype.addSourceBuffer === "function" && typeof window[property].prototype.endOfStream === "function") {
doMediaSource(window[property]);
}
}
// 监听资源全部录取成功
function doMediaSource(MediaSource) {
let _endOfStream = MediaSource.prototype.endOfStream;
MediaSource.prototype.endOfStream = function () {
isEndOfStream = true;
$downloadNum.innerHTML = `已捕获到终点，请下载`;
showTip('已捕获到终点，请下载');
if (isStreamDownload) {
setTimeout(_streamDownload); // 等待 MediaSource 状态变更
_endOfStream.call(this);
return;
}
_endOfStream.call(this);
};
// 录取资源
let _addSourceBuffer = MediaSource.prototype.addSourceBuffer;
MediaSource.prototype.addSourceBuffer = function (mime) {
if (!isClose) {
if (isEndOfStream && _sourceBufferList.length > 0) {
if (confirm('检测到新的视频流，是否下载已捕获？\n点击“确定”下载已捕获\n点击“取消”重新捕获')) {
_download();
}
}
if (document.getElementById('media-source-capture') === null) {
_appendDom();
}
let sourceBuffer = _addSourceBuffer.call(this, mime);
let _append = sourceBuffer.appendBuffer;
let bufferList = [];
const _sourceBuffer = {
mime,
bufferList,
MSEInstance: this,
};
// 如果 streamSaver 已提前加载完成，则初始化对应的 streamWriter
try {
if (window.streamSaver) {
const type = mime.split(';')[0].split('/')[1];
_sourceBuffer.streamWriter = streamSaver.createWriteStream(`${type[0]}_${downloadDate.getFullYear().toString().padStart(4, '0')}${downloadDate.getMonth().toString().padStart(2, '0')}${downloadDate.getDay().toString().padStart(2, '0')}_${downloadDate.getHours().toString().padStart(2, '0')}${downloadDate.getMinutes().toString().padStart(2, '0')}${downloadDate.getSeconds().toString().padStart(2, '0')}.${type[1]}`).getWriter()
}
} catch (error) {
console.error(error);
}
_sourceBufferList.push(_sourceBuffer);
sourceBuffer.appendBuffer = function (buffer) {
$downloadNum.innerHTML = `已捕获 ${_sourceBufferList.length} 个片段`;
if (isStreamDownload && _sourceBuffer.streamWriter) { // 流式下载
_sourceBuffer.streamWriter.write(new Uint8Array(buffer));
} else { // 普通 blob 下载
bufferList.push(buffer);
}
_append.call(this, buffer);
}
return sourceBuffer;
}
};
MediaSource.prototype.addSourceBuffer.toString = function () {
return 'function addSourceBuffer() { [native code] }';
};
}
// 添加操作的 dom
function _appendDom() {
if (document.getElementById('media-source-extract')) {
return;
}
$container.setAttribute("style", 'position: fixed; top: 50px; right: 50px; text-align: right; z-index: 9999;');
const baseStyle = 'float:right; clear:both; margin-top: 10px; padding: 0 20px; color: white; cursor: pointer; font-size: 16px; font-weight: bold; line-height: 40px; text-align: center; border-radius: 4px; background-color: #3498db; box-shadow: 0 3px 6px 0 rgba(0, 0, 0, 0.3);';
$tenRate.innerHTML = '16倍速捕获(静音)';
$downloadNum.innerHTML = '已捕获 0 个片段';
$btnStreamDownload.innerHTML = '特大视频下载，边下载边保存';
$btnDownload.innerHTML = '下载已捕获片段';
$btnDownload.id = 'media-source-extract';
$tenRate.setAttribute("style", baseStyle);
$downloadNum.setAttribute("style", baseStyle);
$btnDownload.setAttribute("style", baseStyle);
$btnStreamDownload.setAttribute("style", baseStyle);
$btnStreamDownload.style.display = 'none';
$showBtn.setAttribute("style", 'float:right; clear:both; display: none; margin-top: 4px; height: 34px; width: 34px; line-height: 34px; text-align: center; border-radius: 4px; background-color: rgba(0, 0, 0, 0.5);');
$closeBtn.setAttribute("style", 'float:right; clear:both; margin-top: 10px; height: 34px; width: 34px; line-height: 34px; text-align: center; display: inline-block; border-radius: 50%; background-color: rgba(0, 0, 0, 0.5);');
$btnDownload.addEventListener('click', _download);
$tenRate.addEventListener('click', function () {
if ($tenRate.innerHTML === '16倍速捕获(静音)') {
_tenRatePlay(16);
$tenRate.innerHTML = '恢复正常倍速音量';
} else {
_tenRatePlay(1);
$tenRate.innerHTML = '16倍速捕获(静音)';
}
});
// 关闭控制面板
$closeBtn.addEventListener('click', function () {
$downloadNum.style.display = 'none';
$btnStreamDownload.style.display = 'none';
$btnDownload.style.display = 'none';
$closeBtn.style.display = 'none';
$tenRate.style.display = 'none';
$showBtn.style.display = 'inline-block';
_sourceBufferList = [];
isClose = true;
});
// 显示控制面板
$showBtn.addEventListener('click', function () {
if (!isStreamDownload) {
$btnDownload.style.display = 'inline-block';
$btnStreamDownload.style.display = 'inline-block';
}
$downloadNum.style.display = 'inline-block';
$closeBtn.style.display = 'inline-block';
$tenRate.style.display = 'inline-block';
$showBtn.style.display = 'none';
isClose = false;
});
// 启动流式下载
$btnStreamDownload.addEventListener('click', function () {
isStreamDownload = true;
$btnDownload.style.display = $btnStreamDownload.style.display = 'none';
for (let sourceBuffer of _sourceBufferList) {
if (!sourceBuffer.streamWriter) {
const type = sourceBuffer.mime.split(';')[0].split('/');
sourceBuffer.streamWriter = streamSaver.createWriteStream(`${type[0]}_${downloadDate.getFullYear().toString().padStart(4, '0')}${downloadDate.getMonth().toString().padStart(2, '0')}${downloadDate.getDay().toString().padStart(2, '0')}_${downloadDate.getHours().toString().padStart(2, '0')}${downloadDate.getMinutes().toString().padStart(2, '0')}${downloadDate.getSeconds().toString().padStart(2, '0')}.${type[1]}`).getWriter();
sourceBuffer.bufferList.forEach(buffer => {
sourceBuffer.streamWriter.write(new Uint8Array(buffer));
});
sourceBuffer.bufferList = [];
}
}
})
document.getElementsByTagName('html')[0].insertBefore($container, document.getElementsByTagName('head')[0]);
$container.appendChild($btnStreamDownload);
$container.appendChild($downloadNum);
$container.appendChild($btnDownload);
$container.appendChild($tenRate);
$container.appendChild($closeBtn);
$container.appendChild($showBtn);
// 加载 stream 流式下载器
try {
let $streamSaver = document.createElement('script');
$streamSaver.src = 'https://upyun.luckly-mjw.cn/lib/stream-saver.js';
document.body.appendChild($streamSaver);
$streamSaver.addEventListener('load', () => {
$btnStreamDownload.style.display = 'inline-block';
});
} catch (error) {
console.error(error);
}
}
})();
if (window === top) {
window.addEventListener("message", event => {
if (event.source !== window) {
try {
let sql = event.data.split("\x00");
if (sql[0] === "showTip" && sql[1].constructor === String) {
if (sql[2]) showTip(sql[1], sql[2]);
}
} catch (e) {
// 排除 下标越界错误 及 指令处理错误
}
}
});
}
function showTip(msg, style = ``) {
// 该函数需要在top内运行，否则可能显示异常
let root = document.querySelector(`:root`);
if (window === top) {
let tip = document.querySelector(":root>tip");
if (tip && tip.nodeType === 1) {
// 防止中途新的showTip事件创建多个tip造成卡顿
tip.remove();
}
tip = document.createElement("tip");
// pointer-events: none; 禁用鼠标事件，input标签使用 disabled='disabled' 禁用input标签
tip.setAttribute("style", style + "pointer-events: none; opacity: 0; background-color: #222a; color: #fff; font-family: 微软雅黑,黑体,Droid Serif,Arial,sans-serif; font-size: 20px; text-align: center; padding: 6px; border-radius: 16px; position: fixed; transform: translate(-50%, -50%); left: 50%; bottom: 15%; z-index: 2147483647;");
tip.innerHTML = "<style>@keyframes showTip {0%{opacity: 0;} 33.34%{opacity: 1;} 66.67%{opacity: 1;} 100%{opacity: 0;}}</style>\n" + msg;
let time = msg.replace(new RegExp("\\s"), "").length / 2; // TODO 2个字/秒
// cubic-bezier(起始点, 起始点偏移量, 结束点偏移量, 结束点)，这里的 cubic-bezier函数 表示动画速度的变化规律
tip.style.animation = "showTip " + (time > 2 ? time : 2) + "s cubic-bezier(0," + ((time - 1) > 0 ? (time - 1) / time : 0) + "," + (1 - ((time - 1) > 0 ? (time - 1) / time : 0)) + ",1) 1 normal";
root.appendChild(tip);
setTimeout(function () {
try {
tip.remove();
} catch (e) {
// 排除root没有找到tip
}
}, time * 1000);
} else {
top.postMessage("showTip\x00" + msg + "\x00" + style, "*");
}
}
})();