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Stable Volume Emulator

Mimics stable volume control for YouTube.

Versione datata 15/09/2024. Vedi la nuova versione l'ultima versione.

// ==UserScript==
// @name         Stable Volume Emulator
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  Mimics stable volume control for YouTube.
// @author       InariOkami
// @match        *://www.youtube.com/*
// @grant        none
// @icon         https://cdn.pixabay.com/photo/2021/10/02/23/20/logo-6676544_1280.png
// ==/UserScript==
(function() {
    'use strict';
    const volumeStorageKey = 'youtube_stable_volume';
    const volumeNormalizationKey = 'youtube_volume_normalization';
    let storedVolume = 0.5;
    let volumeHistory = [];
    function loadSettings() {
        const savedVolume = localStorage.getItem(volumeStorageKey);
        if (savedVolume !== null) {
            storedVolume = parseFloat(savedVolume);
        }
        const savedHistory = localStorage.getItem(volumeNormalizationKey);
        if (savedHistory !== null) {
            volumeHistory = JSON.parse(savedHistory);
        }
    }
    function saveVolume(volume) {
        localStorage.setItem(volumeStorageKey, volume);
    }
    function saveVolumeHistory() {
        localStorage.setItem(volumeNormalizationKey, JSON.stringify(volumeHistory));
    }
    function calculateAverageVolume() {
        if (volumeHistory.length === 0) return storedVolume;
        const total = volumeHistory.reduce((acc, val) => acc + val, 0);
        return total / volumeHistory.length;
    }
    function applyVolume(video, volume) {
        const smoothVolume = (video.volume + volume) / 2;
        video.volume = smoothVolume;
        volumeHistory.push(smoothVolume);
        if (volumeHistory.length > 10) volumeHistory.shift();
        saveVolumeHistory();
        video.addEventListener('volumechange', () => {
            saveVolume(video.volume);
            volumeHistory.push(video.volume);
            if (volumeHistory.length > 10) volumeHistory.shift();
            saveVolumeHistory();
        });
    }
    function handleVideo(video) {
        if (video) {
            const averageVolume = calculateAverageVolume();
            applyVolume(video, averageVolume);
        }
    }
    function observeDOMChanges() {
        const observer = new MutationObserver(mutations => {
            mutations.forEach(mutation => {
                mutation.addedNodes.forEach(node => {
                    if (node.nodeName === 'VIDEO') {
                        handleVideo(node);
                    }
                });
            });
        });
        observer.observe(document.body, { childList: true, subtree: true });
    }
    function init() {
        loadSettings();
        const video = document.querySelector('video');
        handleVideo(video);
        observeDOMChanges();
    }
    init();
})();