YouTube.com more playback speeds (Mobile / Desktop)

Adds 2.25x 2.5x 2.75x 3x speed buttons below the video. Works on mobile, tablet (m.youtube.com) and on desktop.

您需要先安装一个扩展,例如 篡改猴Greasemonkey暴力猴,之后才能安装此脚本。

您需要先安装一个扩展,例如 篡改猴暴力猴,之后才能安装此脚本。

您需要先安装一个扩展,例如 篡改猴暴力猴,之后才能安装此脚本。

您需要先安装一个扩展,例如 篡改猴Userscripts ,之后才能安装此脚本。

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey,才能安装此脚本。

您需要先安装用户脚本管理器扩展后才能安装此脚本。

(我已经安装了用户脚本管理器,让我安装!)

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

(我已经安装了用户样式管理器,让我安装!)

// ==UserScript==
// @name         YouTube.com more playback speeds (Mobile / Desktop)
// @namespace    m-youtube-com-more-playback-speeds
// @version      1.12
// @description  Adds 2.25x 2.5x 2.75x 3x speed buttons below the video. Works on mobile, tablet (m.youtube.com) and on desktop.
// @author       hlorand.hu
// @match        https://m.youtube.com/*
// @match        https://youtube.com/*
// @match        https://*.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant        none
// @license      https://creativecommons.org/licenses/by-nc-sa/4.0/
// ==/UserScript==

// Screenshot: https://ibb.co/chtmD9F

(function() {
    //'use strict';

    function setspeed(speed){

        // highlight
        document.querySelectorAll(".speedbutton").forEach((btn)=>{
            if( btn.textContent == speed){
                btn.style.backgroundColor = "darkorange";
            } else {
                btn.style.backgroundColor = "blue";
            }
        });

        let video = document.querySelector("video");

        if(video && video.readyState >= 2) {

            localStorage.setItem("yt_playbackspeed", speed);

            video.playbackRate = speed;
            video.mozPreservesPitch = video.webkitPreservesPitch = video.preservePitch = true;
        }
    }

    function addbuttons(){
        document.getElementById("speedbuttons").innerText = "";

        const speeds = ["3.5","3.25","3.0","2.75","2.5","2.25","2.0","1.75","1.5","1.25","1.0"];

        speeds.forEach((speed)=>{
            let button = document.createElement('button');
            button.textContent = speed;
            button.className = "speedbutton";

            button.style.margin = "4px";
            button.style.padding = "4px";

            button.style.backgroundColor = "blue";
            button.style.position = "relative";

            button.onclick = function() {
                setspeed(this.textContent);
            };

            let target = document.getElementById("speedbuttons");
            target.insertBefore(button, target.firstChild);

        }); // end speeds foreach

    } // end addbuttons

    // Periodically check if the buttons are visible
    // (sometimes YouTube redraws its interface).
    setInterval(()=>{
        // Creating a div that will contain buttons.
        if( document.getElementById("speedbuttons") == undefined ){
            
            // placement of buttons on desktop
            let parent = document.getElementById('above-the-fold');

            // placement of buttons on tablet
            if( !parent ){
                parent = document.querySelector('.watch-below-the-player');
            }

            // placement of buttons on mobile
            if( !parent ){
                parent = document.querySelector('.related-chips-slot-wrapper');
            }

            let wrapper = document.createElement('div');
            wrapper.setAttribute("id","speedbuttons");
            parent.insertBefore(wrapper, parent.firstChild);
            addbuttons();

        }

        // Sometimes the buttons are not added, so I check and add them if necessary.
        if( document.getElementById("speedbuttons").textContent.trim() === '' ){
            addbuttons();
        }

        setspeed( localStorage.getItem("yt_playbackspeed") ?? 1 );

    }, 1000);

})();