YouTube 播放加速

不错过资讯的同时跳过废话
目前为 2023-12-03 提交的版本。查看最新版本。
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// ==UserScript==
// @name              YouTube Playback Speed Up
// @name:zh-TW        YouTube 播放加速
// @name:zh-HK        YouTube 播放加速
// @name:zh-CN        YouTube 播放加速
// @namespace         https://github.com/NightFeather0615
// @version           2.3
// @description       Speeding up shit talking without leaving out any information
// @description:zh-TW 不錯過資訊的同時跳過廢話
// @description:zh-HK 不錯過資訊的同時跳過廢話
// @description:zh-CN 不错过资讯的同时跳过废话
// @author            NightFeather
// @match             http*://www.youtube.com/watch*
// @icon              https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant             none
// @license           MPL-2.0
// ==/UserScript==

/* jshint esversion: 8 */
/* jshint -W083 */
/* jshint multistr: true */

/* eslint no-multi-str: 0 */

const waitElement = async (selector) => {
    'use strict';

    while (document.querySelector(selector) === null) {
        await new Promise(resolve => requestAnimationFrame(resolve));
    }

    return document.querySelector(selector);
};

const asyncSleep = async (ms) => {
    'use strict';

    return new Promise(resolve => setTimeout(resolve, ms));
};

const insertStyleSheet = () => {
    let styleSheet = document.createElement("style");
    styleSheet.textContent = ' \
.player-playback-speed-hint { \
  -webkit-box-pack: center; \
  -ms-flex-pack: center; \
  background-color: rgba(28, 28, 28, 0.9); \
  border-radius: 6px; \
  color: #f1f1f1; \
  display: -webkit-box; \
  display: -ms-flexbox; \
  display: flex; \
  height: 36px; \
  justify-content: center; \
  left: 50%; \
  line-height: 36px; \
  margin-left: -65px; \
  position: absolute; \
  top: 18px; \
  width: 170px; \
  z-index: 77; \
  font-size: 13px; \
} \
 \
.player-playback-speed-hint-icon { \
  display: inline-block; \
  margin-right: 8px; \
  width: 22px \
} \
    '; // Style sheet from bilibili
    document.head.appendChild(styleSheet);
}

const insertPlaybackSpeedHint = async () => {
    let moviePlayer = await waitElement("#movie_player");

    let hint = document.createElement("div");
    hint.className = "player-playback-speed-hint";
    hint.style.display = "none";
    hint.innerHTML = ' \
<span class="player-playback-speed-hint-icon"> \
    <svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-player-track-next-filled" stroke-linecap="round" stroke-linejoin="round" viewBox="0 0 24 24" stroke-width="2" stroke="white" fill="white" height="36" width="22"> \
        <path stroke="none" d="M0 0h24v24H0z" fill="none"></path> \
        <path d="M2 5v14c0 .86 1.012 1.318 1.659 .753l8 -7a1 1 0 0 0 0 -1.506l-8 -7c-.647 -.565 -1.659 -.106 -1.659 .753z" stroke-width="0" fill="currentColor"></path> \
        <path d="M13 5v14c0 .86 1.012 1.318 1.659 .753l8 -7a1 1 0 0 0 0 -1.506l-8 -7c-.647 -.565 -1.659 -.106 -1.659 .753z" stroke-width="0" fill="currentColor"></path> \
    </svg> \
</span> \
<span class="player-playback-speed-hint-text"> \
</span> \
    '; // Icon from Tabler Icons

    moviePlayer.appendChild(hint);
}



(async function() {
    'use strict';

    const speedUpKey = 18;
    const increaseSpeedKey = 33;
    const decreaseSpeedKey = 34;
    const resetSpeedKey = 46;
    const fixSpeedKey = 17;

    let isSpeedUp = false;
    let isSpeedFixed = false;
    let speedUpRate = 3;

    let videoPlayer = await waitElement("video");
    console.log(`[YT Playback Speed Up] Video player initialized`);

    let speedBeforeModify = videoPlayer.playbackRate;
    console.log(`[YT Playback Speed Up] Default playback speed is ${speedBeforeModify}`);

    insertStyleSheet();
    await insertPlaybackSpeedHint();
    let playbackSpeedHint = await waitElement(".player-playback-speed-hint");
    let playbackSpeedHintText = await waitElement(".player-playback-speed-hint-text");
    console.log(`[YT Playback Speed Up] Player hint initialized`);

    const updateStatus = () => {
        if (isSpeedUp) {
            videoPlayer.playbackRate = speedUpRate;
            playbackSpeedHint.style.display = "";
            playbackSpeedHintText.textContent = `Playback Speed x${speedUpRate.toFixed(1)}`;
            console.log(`[YT Playback Speed Up] Speeding up playback`);
        } else {
            videoPlayer.playbackRate = speedBeforeModify;
            playbackSpeedHint.style.display = "none";
            console.log(`[YT Playback Speed Up] Set speed up rate to ${speedBeforeModify}`);
        }
    };

    document.addEventListener("keydown", async (event) => {
        event.preventDefault();

        switch(event.keyCode) {
            case speedUpKey: {
                if (event.repeat || isSpeedFixed) return;

                isSpeedUp = true;

                if (isSpeedUp) {
                    speedBeforeModify = videoPlayer.playbackRate;
                    updateStatus();
                }

                break;
            }
            case increaseSpeedKey: {
                speedUpRate += 0.5;
                console.log(`[YT Playback Speed Up] Set speed up rate to ${speedUpRate}`);

                updateStatus();

                break;
            }
            case decreaseSpeedKey: {
                if (speedUpRate <= 0) return;

                speedUpRate -= 0.5;
                console.log(`[YT Playback Speed Up] Set speed up rate to ${speedUpRate}`);

                updateStatus();

                break;
            }
            case resetSpeedKey: {
                speedUpRate = 3;
                console.log(`[YT Playback Speed Up] Set speed up rate to ${speedUpRate}`);

                updateStatus();

                break;
            }
            case fixSpeedKey: {
                if (!isSpeedUp && !isSpeedFixed) return;

                if (isSpeedUp && !isSpeedFixed) {
                    isSpeedFixed = true;
                } else {
                    isSpeedUp = false;
                    isSpeedFixed = false;
                }

                updateStatus();

                break;
            }
            default: return;
        }
    });

    document.addEventListener("keyup", (event) => {
        event.preventDefault();

        if (event.keyCode === speedUpKey && !isSpeedFixed) {
            isSpeedUp = false;
            updateStatus();
        }
    });
})();
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