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自动升级到720P+预取Key减少缓冲
// ==UserScript==
// @name 人卫慕课播放助手
// @namespace https://qinlili.bid
// @version 0.1.2
// @description 自动升级到720P+预取Key减少缓冲
// @author 琴梨梨
// @match *://www.pmphmooc.com/*
// @icon https://www.pmphmooc.com/static/favicon.ico
// @require https://lib.baomitu.com/m3u8-parser/4.7.0/m3u8-parser.min.js#sha512-k+LQLfQIGmuQTgjCfnE/iU3jdv+J9sdykVF5SgKtc+aMiKWPZqGjs60Bp3lug6rh9DVhcSZefpetyVXwUny48w==
// @grant none
// @license WTFPL
// ==/UserScript==
(function() {
'use strict';
(function(appendChild) {
Node.prototype.appendChild = function(ele,loc) {
if(ele.src&&ele.src.startsWith("http://")>0){
console.log(ele)
ele.src=ele.src.replace("http://","https://")
}
return appendChild.call(this, ele,loc);
};
})(Node.prototype.appendChild);
//https://stackoverflow.com/a/52171480
const cyrb53 = function(str, seed = 0) {
let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
for (let i = 0, ch; i < str.length; i++) {
ch = str.charCodeAt(i);
h1 = Math.imul(h1 ^ ch, 2654435761);
h2 = Math.imul(h2 ^ ch, 1597334677);
}
h1 = Math.imul(h1 ^ (h1>>>16), 2246822507) ^ Math.imul(h2 ^ (h2>>>13), 3266489909);
h2 = Math.imul(h2 ^ (h2>>>16), 2246822507) ^ Math.imul(h1 ^ (h1>>>13), 3266489909);
return 4294967296 * (2097151 & h2) + (h1>>>0);
};
//https://stackoverflow.com/a/61226119
const blobToBase64 = blob => {
const reader = new FileReader();
reader.readAsDataURL(blob);
return new Promise(resolve => {
reader.onloadend = () => {
resolve(reader.result);
};
});
};
let cacheKey={}
const makeCache=async(url,hashKey)=>{
let cache=await blobToBase64(await (await fetch(url)).blob())
cacheKey[hashKey]=cache
document.getElementsByClassName("videoTitle")[0].innerText+="[缓冲加速已开启]"
}
const m3u8Prefetch=async(m3u8)=>{
console.log("Begin prefetch, getting m3u8 info...-Qinlili")
const m3u8Text=await (await fetch(m3u8)).text();
const parser = new m3u8Parser.Parser();
parser.push(m3u8Text);
const segments=parser.manifest.segments;
console.log("Success fetch m3u8 info. -Qinlili")
console.log(segments);
segments.forEach(async part=>{
const controller = new AbortController();
const signal = controller.signal;
await fetch(part.uri.replace("http://","https://"),{
method:"GET",
signal:signal
})
controller.abort();
})
console.log("Prefetch done. -Qinlili")
}
(open=> {
XMLHttpRequest.prototype.open = function (method, url, async, user, pass) {
if(url.startsWith("http://")){
url=url.replace("http://","https://")
}
if (url.indexOf("index.m3u8")>0) {
console.log("Get m3u8 link: " + url + " -Qinlili");
url = url.replace("480P","720P");
m3u8Prefetch(url);
}
if (url.indexOf("/api/m3u8/getUri")>0) {
let hashKey=cyrb53(url)
if(cacheKey[hashKey]){
console.log("Use local cache key-Qinlili")
url=cacheKey[hashKey]
}else{
console.log("No key cache, use async fetch: " + url + " -Qinlili")
makeCache(url,hashKey)
}
}
return open.call(this, method, url, async, user, pass);
};
})(XMLHttpRequest.prototype.open);
})();