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全能视频下载器

黑科技！使用MediaSouce的视频下载技术！

질문, 리뷰하거나, 이 스크립트를 신고하세요. 
  1. // ==UserScript==
  2. // @name         全能视频下载器
  3. // @namespace    https://qinlili.bid
  4. // @version      0.2
  5. // @description  黑科技！使用MediaSouce的视频下载技术！
  6. // @author       琴梨梨
  7. // @match        https://library.koolearn.com/*
  8. // @match        *://www.pmphmooc.com/*
  9. // @grant        none
  10. // ==/UserScript==
  11. //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
  12.  
  13. (function() {
  14.     'use strict';
  15.     //https://stackoverflow.com/questions/49129643/how-do-i-merge-an-array-of-uint8arrays
  16.     const concat=(arrays)=> {
  17.         // sum of individual array lengths
  18.         let totalLength = arrays.reduce((acc, value) => acc + value.length, 0);
  19.  
  20.         if (!arrays.length) return null;
  21.  
  22.         let result = new Uint8Array(totalLength);
  23.  
  24.         // for each array - copy it over result
  25.         // next array is copied right after the previous one
  26.         let length = 0;
  27.         for(let array of arrays) {
  28.             result.set(array, length);
  29.             length += array.length;
  30.         }
  31.  
  32.         return result;
  33.     }
  34.     const dlFile = (link, name) => {
  35.         let eleLink = document.createElement('a');
  36.         eleLink.download = name;
  37.         eleLink.style.display = 'none';
  38.         eleLink.href = link;
  39.         document.body.appendChild(eleLink);
  40.         eleLink.click();
  41.         document.body.removeChild(eleLink);
  42.     }
  43.  
  44.  
  45.  
  46.     (function (addSourceBuffer) {
  47.         MediaSource.prototype.addSourceBuffer = function (mime) {
  48.             console.log(mime)
  49.             switch (mime.substr(0,5)){
  50.                 case "audio":
  51.                     window.ams=addSourceBuffer.call(this, mime);
  52.                     return window.ams
  53.                     window.audioBuffer=[];
  54.                     break;
  55.                 case "video":
  56.                     window.vms=addSourceBuffer.call(this, mime);
  57.                     return window.vms
  58.                     window.videoBuffer=[];
  59.                     break;
  60.                 default:
  61.                     return addSourceBuffer.call(this, mime);
  62.             }
  63.         };
  64.     })(MediaSource.prototype.addSourceBuffer);
  65.  
  66.     window.videoBuffer=[];
  67.     window.audioBuffer=[];
  68.  
  69.     (function (appendBuffer) {
  70.         SourceBuffer.prototype.appendBuffer = function (source) {
  71.             if(this==window.ams){
  72.                 console.log("audio buffer get")
  73.                 window.audioBuffer[window.audioBuffer.length]=source
  74.             }
  75.             if(this==window.vms){
  76.                 console.log("video buffer get")
  77.                 window.videoBuffer[window.videoBuffer.length]=source
  78.             }
  79.             appendBuffer.call(this, source);
  80.         };
  81.     })(SourceBuffer.prototype.appendBuffer);
  82.     const title=document.createElement("button")
  83.     document.body.insertBefore(title,document.body.firstChild);
  84.     title.innerText+="[点我开始下载视频]"
  85.     title.addEventListener("click",()=>{
  86.         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！！！")
  87.         title.innerText="[正在保存视频，请等待播放完成]"
  88.         const video=document.getElementsByTagName("video")[0]
  89.         video.addEventListener("ended",()=>{
  90.             title.innerText="[正在导出视频]"
  91.             var audioFile=new Blob([concat(window.audioBuffer)])
  92.             dlFile(URL.createObjectURL(audioFile),"音频.m4a")
  93.             var videoFile=new Blob([concat(window.videoBuffer)])
  94.             dlFile(URL.createObjectURL(videoFile),"视频.mp4")
  95.         })
  96.         video.playbackRate=16
  97.     })
  98.  
  99.  
  100. })();