evan/js-mediaDownloader
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wenyifan 2023-05-28 18:09:23 +08:00
parent 8472b29247
commit 49dae65bca
2 changed files with 75 additions and 63 deletions
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2
README.md
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@ -37,7 +37,7 @@ ffmpeg -i audio.aac -i video.mp4 -c copy -bsf:a aac_adtstoasc out.mp4
## 大文件分段需要先文件合并
```
copy /b mediasource_0_0_*.mp4 out.mp4
copy /b media_0_*.mp4 out.mp4
```
## 特别说明

128
downloadMedia.js
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@ -1,7 +1,7 @@
// ==UserScript==
// @name Universal encrypted video downloader
// @namespace http://tampermonkey.net/
// @version 0.1
// @version 1.1
// @description Bypass the encrypted video download protection via js hook
// @author Evan
// @match https://www.bilibili.com/video/*
@ -15,70 +15,81 @@
jsMedia = new Object();
jsMedia.mediaSources = [];
jsMedia.enableAutoDownload = true;
//1G
jsMedia.fragmentSize = 1024*1024*1024;
(function () {
let mediaSourceSeq = 0;
jsMedia.videos = document.getElementsByTagName('video');
jsMedia.downloadRawData = function (bufferList, fileName = 'out', ext = '.mp4') {
var buffList = new Array();
var totalLength = 0;
for (var i = 0; i < bufferList.length; i++) {
totalLength += bufferList[i].byteLength;
if (totalLength > 1073741824 || i == bufferList.length - 1) {
buffList.push(new Uint8Array(totalLength));
totalLength = 0;
}
}
var lastLength = 0;
var part = 0;
for (var ix = 0; ix < bufferList.length; ix++) {
//10485760
//1073741824
buffList[part].set(new Uint8Array(bufferList[ix]), lastLength);
lastLength += bufferList[ix].byteLength;
if (lastLength > 1073741824) {
part++;
lastLength = 0
}
}
for (var iz = 0; iz < buffList.length; iz++) {
var buff = buffList[iz];
let url = window.URL.createObjectURL(new Blob([buff], { type: "arraybuffer" }))
jsMedia.addZero = function(num){
return ('00' + num).slice(-3);
};
jsMedia.downloadBlob = function (buff, fileName) {
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 + "_" + iz + ext);
link.setAttribute('download', fileName);
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
};
jsMedia.calcBlobLength = function (buffList) {
let totalLength = 0;
for (let i = 0; i < buffList.length; i++) {
totalLength = totalLength + buffList[i].byteLength;
}
return totalLength;
};
jsMedia.MyMediaSourceBuffer = function () {
this.id = 0;
this.rawData1 = [];
this.rawData2 = [];
let currentSlot = 0;
let downloadedIndex = 0;
this.download = function () {
let lastSlot = currentSlot;
if (currentSlot === 0) {
currentSlot = 1;
} else {
currentSlot = 0;
}
if (lastSlot == 0) {
jsMedia.downloadBlob(this.rawData1, 'media_' + this.id + '_' + jsMedia.addZero(downloadedIndex) + '.mp4');
this.rawData1 = [];
} else {
jsMedia.downloadBlob(this.rawData2, 'media_' + this.id + '_' + jsMedia.addZero(downloadedIndex) + '.mp4');
this.rawData2 = [];
}
downloadedIndex++;
};
this.appendBuffer = function (buf) {
let totalLength = 0;
if (currentSlot === 0) {
this.rawData1.push(buf);
totalLength = jsMedia.calcBlobLength(this.rawData1);
} else {
this.rawData2.push(buf);
totalLength = jsMedia.calcBlobLength(this.rawData2);
}
if (totalLength >= jsMedia.fragmentSize) {
this.download();
}
};
jsMedia.download = function () {
for (var i = 0; i < jsMedia.mediaSources.length; i++) {
var currentItem = jsMedia.mediaSources[i];
if (currentItem.downloaded == undefined || currentItem.downloaded == false) {
for (var x = 0; x < currentItem.rawSources.length; x++) {
jsMedia.downloadRawData(currentItem.rawSources[x], 'mediasource_' + i + '_' + x);
}
}
currentItem.downloaded = true;
}
};
jsMedia.downloadMediaSource = function (mediaSource) {
for (var x = 0; x < mediaSource.rawSources.length; x++) {
jsMedia.downloadRawData(mediaSource.rawSources[x], 'mediasource_' + x);
mediaSource.downloaded = true;
jsMedia.download = function(){
for (let i = 0, length = jsMedia.mediaSources.length; i < length; i++) {
jsMedia.mediaSources[i].download();
}
};
jsMedia.setSpeed = function (speed) {
for (let i = 0, length = jsMedia.videos.length; i < length; i++) {
jsMedia.videos[i].playbackRate = 10;
jsMedia.videos[i].playbackRate = speed;
}
};
@ -86,30 +97,31 @@ jsMedia.enableAutoDownload = true;
MediaSource.prototype.addSourceBuffer = function (mimeType) {
var mediaSourceThis = this;
jsMedia.mediaSources.push(this);
this.lastPos = 0;
var retSourceBuffer = proxy_addSourceBuffer.apply(this, [].slice.call(arguments));
if (this.rawSources == undefined) {
this.rawSources = [];
}
retSourceBuffer.mySourceBuffer = new jsMedia.MyMediaSourceBuffer();
retSourceBuffer.mySourceBuffer.id = mediaSourceSeq;
jsMedia.mediaSources.push(retSourceBuffer.mySourceBuffer);
if (jsMedia.enableAutoDownload) {
this.onsourceended = function () {
jsMedia.download();
};
this.onsourceclose = function () {
jsMedia.downloadMediaSource(this);
jsMedia.download();
};
}
var retSourceBuffer = proxy_addSourceBuffer.apply(this, [].slice.call(arguments));
if (this.rawSources == undefined) {
this.rawSources = [];
}
var buffList = [];
this.rawSources.push(buffList);
retSourceBuffer.rawData = buffList;
mediaSourceSeq++;
return retSourceBuffer;
};
var proxy_appendBuffer = SourceBuffer.prototype.appendBuffer;
SourceBuffer.prototype.appendBuffer = function (buf) {
this.rawData.push(buf);
this.mySourceBuffer.appendBuffer(buf);
return proxy_appendBuffer.apply(this, [].slice.call(arguments));
};
})();