From f7124d84a3084705b0825b3b096c493770fbb6fe Mon Sep 17 00:00:00 2001
From: wenyifan <evan.wen@movit-tech.com>
Date: Sat, 20 Aug 2022 14:29:49 +0800
Subject: [PATCH] init

---
 README.md        |  38 +++++++++++++++++
 downloadMedia.js | 106 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+)
 create mode 100644 README.md
 create mode 100644 downloadMedia.js

diff --git a/README.md b/README.md
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+# 通用网页视频下载油猴脚本
+
+## 特性
+- 使用JS-Hook技术基于MediaSource原理捕获解密后的原始视频流,通杀几乎网页视频保护方案
+- 支持直播流
+
+## 已测试场景
+- bilibili所有视频含付费保护视频
+- bilibili直播
+- 虎牙直播
+- 慕课网
+- 腾讯课堂
+- P站 -_-;
+
+## 用法
+- 使用油猴插件导入脚本,修改作用域
+- 脚本生效后视频完成加载会自动完成下载
+- 下载后的文件需要使用FFmpeg完成音视频合并
+
+## 参数
+```javascript
+//自动快进
+evanEnv.enableAutoForward = true
+//完成后自动下载
+evanEnv.enableAutoDownload = true
+```
+
+## FFmpeg合并示例
+```shell
+ffmpeg -i mediasource_0_0.mp4 -i mediasource_0_1.mp4 -c copy -bsf:a aac_adtstoasc out.mp4
+```
+
+## 常见问题
+- 合并后声音播放不正常:由于部分网站使用了HE-AAC v2(AAC+SBR+PS)作为音频编码,大部分播放器还不支持此音频流格式,故声音不正常,使用Windows自带的视频播放器播放正常
+
+
+## 特别说明
+- 仅限内部交流使用,请勿用于非法用途
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diff --git a/downloadMedia.js b/downloadMedia.js
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+++ b/downloadMedia.js
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+// ==UserScript==
+// @name         Universal encrypted video downloader
+// @namespace    http://tampermonkey.net/
+// @version      0.1
+// @description  Bypass the encrypted video download protection via js hook
+// @author       Evan
+// @match        https://www.bilibili.com/video/*
+// @match        https://www.bilibili.com/bangumi/play/*
+// @match        https://www.youtube.com/watch*
+// @match        https://www.huya.com/*
+// @match        https://live.bilibili.com/*
+// @grant        none
+// ==/UserScript==
+
+evanEnv = new Object();
+evanEnv.mediaSources = [];
+evanEnv.enableAutoForward = true;
+evanEnv.enableAutoDownload = true;
+
+(function () {
+    evanEnv.videos = document.getElementsByTagName('video');
+    evanEnv.buildArrayBuffer = function (bufferList) {
+        var totalLength = 0;
+        for (var i = 0; i < bufferList.length; i++) {
+            totalLength += bufferList[i].byteLength;
+        }
+        var tmp = new Uint8Array(totalLength);
+        var lastLength = 0;
+        for (var ix = 0; ix < bufferList.length; ix++) {
+            tmp.set(new Uint8Array(bufferList[ix]), lastLength);
+            lastLength += bufferList[ix].byteLength;
+        }
+        return tmp.buffer;
+    };
+    evanEnv.downloadRawData = function (bufferList, fileName = 'out.mp4') {
+        var buff = evanEnv.buildArrayBuffer(bufferList);
+        let url = window.URL.createObjectURL(new Blob([buff], {type: "arraybuffer"}))
+        const link = document.createElement('a');
+        link.style.display = 'none';
+        link.href = url;
+        link.setAttribute('download', fileName);
+        document.body.appendChild(link);
+        link.click();
+        document.body.removeChild(link);
+    };
+
+    evanEnv.download = function () {
+        for (var i = 0; i < evanEnv.mediaSources.length; i++) {
+            var currentItem = evanEnv.mediaSources[i];
+            if (currentItem.downloaded == undefined || currentItem.downloaded == false) {
+                for (var x = 0; x < currentItem.rawSources.length; x++) {
+                    evanEnv.downloadRawData(currentItem.rawSources[x], 'mediasource_' + i + '_' + x + '.mp4');
+                }
+            }
+            currentItem.downloaded = true;
+        }
+    };
+    evanEnv.downloadMediaSource = function (mediaSource) {
+        for (var x = 0; x < mediaSource.rawSources.length; x++) {
+            evanEnv.downloadRawData(mediaSource.rawSources[x], 'mediasource_' + x + '.mp4');
+            mediaSource.downloaded = true;
+        }
+    };
+
+    var proxy_addSourceBuffer = MediaSource.prototype.addSourceBuffer;
+    MediaSource.prototype.addSourceBuffer = function (mimeType) {
+        var mediaSourceThis = this;
+
+        evanEnv.mediaSources.push(this);
+        this.lastPos = 0;
+        if (evanEnv.enableAutoDownload) {
+            this.onsourceended = function () {
+                evanEnv.download();
+            };
+            this.onsourceclose = function () {
+                evanEnv.downloadMediaSource(this);
+            };
+        }
+
+
+        var retSourceBuffer = proxy_addSourceBuffer.apply(this, [].slice.call(arguments));
+        if (this.rawSources == undefined) {
+            this.rawSources = [];
+        }
+        var buffList = [];
+        this.rawSources.push(buffList);
+        retSourceBuffer.rawData = buffList;
+        if (evanEnv.enableAutoForward) {
+            retSourceBuffer.onupdate = function () {
+                if (this.buffered != this.buffered.length > 0) {
+                    var endPos = this.buffered.end(0);
+                    if (endPos > 5 && endPos - mediaSourceThis.lastPos > 25) {
+                        evanEnv.videos[0].currentTime = endPos - 3;
+                        mediaSourceThis.lastPos = evanEnv.videos[0].currentTime;
+                    }
+                }
+            };
+        }
+        return retSourceBuffer;
+    };
+    var proxy_appendBuffer = SourceBuffer.prototype.appendBuffer;
+    SourceBuffer.prototype.appendBuffer = function (buf) {
+        this.rawData.push(buf);
+        return proxy_appendBuffer.apply(this, [].slice.call(arguments));
+    };
+})();
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