Reduce Browser's Energy Impact for playing YouTube Video
目前為
// ==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 2021.08.29.3
// @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
// @include https://www.youtube.com/*
// @include https://www.youtube.com/embed/*
// @include https://www.youtube-nocookie.com/embed/*
// @include https://www.youtube.com/live_chat*
// @include https://www.youtube.com/live_chat_replay*
// @icon https://www.google.com/s2/favicons?domain=youtube.com
// @run-at document-start
// @grant none
// ==/UserScript==
(function $$() {
'use strict';
const window = new Function('return window;')(); // real window object
const hkey_script = 'nzsxclvflluv';
if (window[hkey_script]) return; // avoid duplicated scripting
window[hkey_script] = true;
//if (!document.documentElement) return window.requestAnimationFrame($$); // no document access
// copies of native functions
const $$requestAnimationFrame = window.requestAnimationFrame.bind(window); // core looping
const $$setTimeout = window.setTimeout.bind(window); // for race
const $$setInterval = window.setInterval.bind(window); // for background execution
let mi = 0;
const sb = {};
const sFunc = (prop) => {
return (func, ms, ...args) => {
mi++;
sb[mi] = {
handler: args.length > 0 ? func.bind(null, ...args) : func, // original func if no extra argument
[prop]: ms, // timeout / interval
nextAt: Date.now() + (ms > 0 ? ms : 0) // overload for setTimeout(func);
};
return mi;
};
};
const rm = (jd) => {
let o = sb[jd];
if (typeof o != 'object') return;
for (let k in o) o[k] = null;
o = null;
sb[jd] = null;
delete sb[jd];
};
window.setTimeout = sFunc('timeout');
window.setInterval = sFunc('interval');
window.clearInterval = window.clearTimeout = rm;
const $busy = Symbol('$busy');
const pf = (handler => {
if ($busy in handler) return;
handler[$busy] = true;
return new Promise(resolve => {
// == microTask [Promise] ==
handler(); // try catch is not required - no further execution on the handler
delete handler[$busy];
resolve();
// == microTask [Promise] ==
});
});
let jf, tf;
let bgExecutionAt = 0;
tf = () => {
let now = Date.now();
// ======= MarcoTask [requestAnimationFrame / setInterval] =======
let promises = [];
for (let mi in sb) {
const o = sb[mi];
let {
handler,
// timeout,
interval,
nextAt
} = o;
if (now < nextAt) continue;
promises.push(pf(handler));
if (interval > 0) {
o.nextAt += interval;
} else {
rm(mi);
}
}
// ======= MarcoTask [requestAnimationFrame / setInterval] =======
if (!document.hidden) {
// calling requestAnimationFrame in visible tab(s) only
if (promises.length > 0) {
let ret1 = Promise.all(promises);
let ret2 = new Promise(resolve => $$setTimeout(resolve, 16));
let race = Promise.race([ret1, ret2]); // ensure jf must be called after 16ms to maintain visual changes in high fps.
race.then(jf);
} else {
jf(); // execution rate is captured by requestAnimationFrame
}
}
bgExecutionAt = now + 160; // lower task execution rate for background playing
};
(jf = $$requestAnimationFrame.bind(window, tf))();
$$setInterval(() => {
// no response of requestAnimationFrame in background
if (Date.now() > bgExecutionAt) tf();
}, 250);
// i.e. interval = 500ms for background execution
// Your code here...
})();