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黑科技！使用MediaSouce的视频下载技术！
// ==UserScript==
// @name 全能视频下载器
// @namespace https://qinlili.bid
// @version 0.2
// @description 黑科技！使用MediaSouce的视频下载技术！
// @author 琴梨梨
// @match https://library.koolearn.com/*
// @match *://www.pmphmooc.com/*
// @grant none
// ==/UserScript==
//这个下载器也可以用于其他网站，自己改一下match地址就行了捏
(function() {
'use strict';
//https://stackoverflow.com/questions/49129643/how-do-i-merge-an-array-of-uint8arrays
const concat=(arrays)=> {
// sum of individual array lengths
let totalLength = arrays.reduce((acc, value) => acc + value.length, 0);
if (!arrays.length) return null;
let result = new Uint8Array(totalLength);
// for each array - copy it over result
// next array is copied right after the previous one
let length = 0;
for(let array of arrays) {
result.set(array, length);
length += array.length;
}
return result;
}
const dlFile = (link, name) => {
let eleLink = document.createElement('a');
eleLink.download = name;
eleLink.style.display = 'none';
eleLink.href = link;
document.body.appendChild(eleLink);
eleLink.click();
document.body.removeChild(eleLink);
}
(function (addSourceBuffer) {
MediaSource.prototype.addSourceBuffer = function (mime) {
console.log(mime)
switch (mime.substr(0,5)){
case "audio":
window.ams=addSourceBuffer.call(this, mime);
return window.ams
window.audioBuffer=[];
break;
case "video":
window.vms=addSourceBuffer.call(this, mime);
return window.vms
window.videoBuffer=[];
break;
default:
return addSourceBuffer.call(this, mime);
}
};
})(MediaSource.prototype.addSourceBuffer);
window.videoBuffer=[];
window.audioBuffer=[];
(function (appendBuffer) {
SourceBuffer.prototype.appendBuffer = function (source) {
if(this==window.ams){
console.log("audio buffer get")
window.audioBuffer[window.audioBuffer.length]=source
}
if(this==window.vms){
console.log("video buffer get")
window.videoBuffer[window.videoBuffer.length]=source
}
appendBuffer.call(this, source);
};
})(SourceBuffer.prototype.appendBuffer);
const title=document.createElement("button")
document.body.insertBefore(title,document.body.firstChild);
title.innerText+="[点我开始下载视频]"
title.addEventListener("click",()=>{
alert("请仔细阅读说明：\n本工具使用MediaSource下载视频\n点击确认后将以16倍速播放视频\n视频会在播放完成后开始下载\n请保持页面前台运行，千万不要拖拽进度条！！！")
title.innerText="[正在保存视频，请等待播放完成]"
const video=document.getElementsByTagName("video")[0]
video.addEventListener("ended",()=>{
title.innerText="[正在导出视频]"
var audioFile=new Blob([concat(window.audioBuffer)])
dlFile(URL.createObjectURL(audioFile),"音频.m4a")
var videoFile=new Blob([concat(window.videoBuffer)])
dlFile(URL.createObjectURL(videoFile),"视频.mp4")
})
video.playbackRate=16
})
})();