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Reduce Browser's Energy Impact for playing YouTube Video
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// ==UserScript==
// @name YouTube CPU Tamer by AnimationFrame
// @name:en YouTube CPU Tamer by AnimationFrame
// @name:jp YouTube CPU Tamer by AnimationFrame
// @name:zh-tw YouTube CPU Tamer by AnimationFrame
// @name:zh-cn YouTube CPU Tamer by AnimationFrame
// @namespace http://tampermonkey.net/
// @version 2022.07.24
// @license MIT License
// @description Reduce Browser's Energy Impact for playing YouTube Video
// @description:en Reduce Browser's Energy Impact for playing YouTube Video
// @description:jp YouTubeビデオのエネルギーインパクトを減らす
// @description:zh-tw 減少YouTube影片所致的能源消耗
// @description:zh-cn 减少YouTube影片所致的能源消耗
// @author CY Fung
// @match https://www.youtube.com/*
// @match https://www.youtube.com/embed/*
// @match https://www.youtube-nocookie.com/embed/*
// @match https://www.youtube.com/live_chat*
// @match https://www.youtube.com/live_chat_replay*
// @match https://music.youtube.com/*
// @icon https://www.google.com/s2/favicons?domain=youtube.com
// @run-at document-start
// @grant none
// ==/UserScript==
(function $$() {
'use strict';
const [window, document] = new Function('return [window, document];')(); // real window & document object
const hkey_script = 'nzsxclvflluv';
if (window[hkey_script]) return; // avoid duplicated scripting
window[hkey_script] = true;
//if (!document.documentElement) return window.requestAnimationFrame($$); // not required to check documentElement ready or not
// copies of native functions
const $$requestAnimationFrame = window.requestAnimationFrame.bind(window); // core looping
const $$setTimeout = window.setTimeout.bind(window); // for race
const $$setInterval = window.setInterval.bind(window); // for background execution
const $$clearTimeout = window.clearTimeout.bind(window); // for native clearTimeout
const $$clearInterval = window.clearInterval.bind(window); // for native clearInterval
const $busy = Symbol('$busy');
// Number.MAX_SAFE_INTEGER = 9007199254740991
const INT_INITIAL_VALUE = 8192; // 1 ~ {INT_INITIAL_VALUE} are reserved for native setTimeout/setInterval
const SAFE_INT_LIMIT = 2251799813685248; // in case cid would be used for multiplying
const SAFE_INT_REDUCED = 67108864; // avoid persistent interval handlers with cids between {INT_INITIAL_VALUE + 1} and {SAFE_INT_REDUCED - 1}
let mi = INT_INITIAL_VALUE; // skip first {INT_INITIAL_VALUE} cids to avoid browser not yet initialized
const sb = {};
const sFunc = (prop) => {
return (func, ms, ...args) => {
mi++; // start at {INT_INITIAL_VALUE + 1}
if (mi > SAFE_INT_LIMIT) mi = SAFE_INT_REDUCED; // just in case
let handler = args.length > 0 ? func.bind(null, ...args) : func; // original func if no extra argument
handler[$busy] || (handler[$busy] = 0);
sb[mi] = {
handler
, [prop]: ms, // timeout / interval; value can be undefined
nextAt: Date.now() + (ms > 0 ? ms : 0) // overload for setTimeout(func);
};
return mi;
};
};
const rm = function (jd) {
if (!jd) return; // native setInterval & setTimeout start from 1
let o = sb[jd];
if (typeof o != 'object') { // to clear the same cid is unlikely to happen || requiring nativeFn is unlikely to happen
if (jd <= INT_INITIAL_VALUE) this.nativeFn(jd); // only for clearTimeout & clearInterval
return;
}
for (let k in o) o[k] = null;
o = null;
sb[jd] = null;
delete sb[jd];
};
window.setTimeout = sFunc('timeout');
window.setInterval = sFunc('interval');
window.clearTimeout = rm.bind({
nativeFn: $$clearTimeout
});
window.clearInterval = rm.bind({
nativeFn: $$clearInterval
});
// window.clearInterval = window.clearTimeout = rm;
const delay16ms = (resolve => $$setTimeout(resolve, 16));
const pf = (
handler => new Promise(resolve => {
// try catch is not required - no further execution on the handler
// For function handler with high energy impact, discard 1st, 2nd, ... (n-1)th calling: (a,b,c,a,b,d,e,f) => (c,a,b,d,e,f)
// For function handler with low energy impact, discard or not discard depends on system performance
if (handler[$busy] == 1) handler();
handler[$busy]--;
handler = null; // remove the reference of `handler`
resolve();
resolve = null; // remove the reference of `resolve`
})
);
let toResetFuncHandlers = false;
let bgExecutionAt = 0; // set at 0 to trigger tf in background startup when requestAnimationFrame is not responsive
let dexActivePage = true; // true for default; false when checking triggered by setInterval
let interupter = null;
const raf = $$requestAnimationFrame.bind(window);
const infiniteLooper = (resolve) => {
interupter = resolve;
if (dexActivePage) raf(resolve); // if dexActivePage = false, the checking will be triggered by setInterval
}
const mbx1 = async () => {
// microTask #1
let now = Date.now();
//bgExecutionAt = now + 160; // if requestAnimationFrame is not responsive (e.g. background running)
let promisesF = [];
for (let jb in sb) {
const o = sb[jb];
let {
handler,
// timeout,
interval
, nextAt
} = o;
if (now < nextAt) continue;
handler[$busy]++;
promisesF.push(handler);
if (interval > 0) { // prevent undefined, zero, negative values
const _interval = +interval; // convertion from string to number if necessary; decimal is acceptable
if (o.nextAt + _interval > now) o.nextAt += _interval;
else if (o.nextAt + 2 * _interval > now) o.nextAt += 2 * _interval;
else if (o.nextAt + 3 * _interval > now) o.nextAt += 3 * _interval;
else if (o.nextAt + 4 * _interval > now) o.nextAt += 4 * _interval;
else if (o.nextAt + 5 * _interval > now) o.nextAt += 5 * _interval;
else o.nextAt = now + _interval;
} else {
// jb in sb must > INT_INITIAL_VALUE
rm(jb); // remove timeout
}
}
return promisesF;
};
let mbx2 = async (promisesF) => {
// microTask #2
//bgExecutionAt = Date.now() + 160; // if requestAnimationFrame is not responsive (e.g. background running)
if (promisesF.length == 0) { // no handler functions
// requestAnimationFrame when the page is active
// execution interval is no less than AnimationFrame
} else if (dexActivePage) {
let ret2 = new Promise(delay16ms);
let ret3 = new Promise(resolveK => {
// error would not affect calling the next tick
Promise.all(promisesF.map(pf)).then(resolveK); //microTasks
promisesF.length = 0;
})
let race = Promise.race([ret2, ret3]);
// ensure checking function must be called after 16ms to maintain visual changes in high fps.
// >16ms examples: repaint/reflow, change of style/content
await race;
} else {
new Promise(resolveK => {
// error would not affect calling the next tick
promisesF.forEach(pf); //microTasks
promisesF.length = 0;
})
}
};
(async () => {
while (true) {
bgExecutionAt = Date.now() + 160;
let interupterRes = await new Promise(infiniteLooper);
interupter = null;
if (dexActivePage === false && interupterRes !== true) toResetFuncHandlers = true;
dexActivePage = (interupterRes !== true);
if (toResetFuncHandlers) {
toResetFuncHandlers = false;
for (let jb in sb) sb[jb].handler[$busy] = 0; // including the functions with error
}
let promisesF = await mbx1();
await mbx2(promisesF);
}
})();
$$setInterval(() => {
// no response of requestAnimationFrame; e.g. running in background
if (interupter && Date.now() > bgExecutionAt) {
interupter(document.hidden ? true : false); // if interupter is not called, wait for the next tick
}
}, 250);
// i.e. 4 times per second for background execution - to keep YouTube application functional
// if there is Timer Throttling for background running, the execution become the same as native setTimeout & setInterval.
window.addEventListener("yt-navigate-finish", () => {
toResetFuncHandlers = true; // ensure all function handlers can be executed after YouTube navigation.
}, true); // capturing event - to let it runs before all everything else.
// Your code here...
})();