// ==UserScript==
// @name                Video Quality Fixer for X (Twitter)
// @name:zh             X (Twitter) 视频画质修复
// @name:zh-CN          X (Twitter) 视频画质修复
// @namespace           https://github.com/yuhaofe
// @version             0.2.1
// @description         Force highest quality playback for X (Twitter) videos.
// @description:zh      强制 X (Twitter) 播放最高画质的视频
// @description:zh-CN   强制 X (Twitter) 播放最高画质的视频
// @author              yuhaofe
// @match               https://x.com/*
// @match               https://mobile.x.com/*
// @match               https://twitter.com/*
// @match               https://mobile.twitter.com/*
// @grant               none
// ==/UserScript==
(function() {
'use strict';
initHijack();
initUI();
function initHijack() {
var realOpen = window.XMLHttpRequest.prototype.open;
window.XMLHttpRequest.prototype.open = hijackedOpen;
function hijackedOpen() {
var url = arguments['1'];
if (isHLSPlaylist(url)) {
this.addEventListener('readystatechange', function(e) {
if (this.readyState === 4) {
var originalText = e.target.responseText;
if(isMasterPlaylist(originalText)) {
var modifiedText = modifyMasterPlaylist(originalText);
Object.defineProperty(this, 'response', {writable: true});
Object.defineProperty(this, 'responseText', {writable: true});
this.response = this.responseText = modifiedText;
}
}
});
}
return realOpen.apply(this, arguments);
};
function isHLSPlaylist(url) {
var reg = new RegExp(/^https:\/\/video\.twimg\.com\/.+m3u8?/, 'i') ;
return reg.test(url);
}
function isMasterPlaylist(text) {
return text.indexOf('#EXT-X-TARGETDURATION') === -1 && text.indexOf('#EXT-X-STREAM-INF') != -1;
}
function modifyMasterPlaylist(text) {
var r###lt = text;
var reg = new RegExp(/^#EXT-X-STREAM-INF:.*BANDWIDTH=(\d+).*\r?\n.*$/, 'gm');
var stream = reg.exec(text);
if (stream) {
var globalTags = text.substring(0, stream.index);
// find max bitrate media playlist
var maxBitrateStream = stream;
while((stream = reg.exec(text)) != null){
if (parseInt(stream[1]) > parseInt(maxBitrateStream[1])) {
maxBitrateStream = stream;
}
}
r###lt = globalTags + maxBitrateStream[0];
}
return r###lt;
}
}
function initUI() {
// add a mark helps identify if userscript loaded successfully
var disableHQ = localStorage.getItem('vqfft-disablehq');
if(!disableHQ) {
var mark = document.createElement('button');
mark.innerText = 'HQ';
mark.style = "position: fixed;right: 5px;top: 5px;color: white;border-width: 0px;border-radius: 5px;background-color: gray;opacity: 0.5;";
mark.onclick = function() {
if(confirm('Do not display HQ mark anymore?')){
localStorage.setItem('vqfft-disablehq', 'true');
mark.remove();
}
};
document.body.appendChild(mark);
}
}
})();