YouTube Optimizer

Enhances your YouTube experience with optimized video playback, improved audio quality, bass boost, and enhanced buffering for maximum performance and enjoyment.
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// ==UserScript==
// @name         YouTube Optimizer
// @namespace    https://gf.qytechs.cn/en/users/1116584-simeonleni
// @description  Enhances your YouTube experience with optimized video playback, improved audio quality, bass boost, and enhanced buffering for maximum performance and enjoyment.
// @include      https://www.youtube.com/*
// @grant        none
// @run-at       document-end
// @version      1.0
// ==/UserScript==
 
 
// Configuration
const MAX_QUALITY = "2160p"; // Maximum video quality to buffer (change as needed)
const BASS_BOOST_LEVEL = 3; // Bass boost level (adjust as needed)
 
// Entry point
window.addEventListener("DOMContentLoaded", main);
 
function main() {
  const player = getPlayer();
  player.addEventListener("onStateChange", function (event) {
    if (event.data === 1) {
      updateSettings(player);
    }
  });
}
 
function updateSettings(player) {
  try {
    if (!isPlayerAvailable(player)) {
      throw new Error("YouTube player not available.");
    }
 
    const currentQuality = player.getPlaybackQuality();
    const currentAudioQuality = player.getPlaybackRate();
 
    if (currentQuality !== MAX_QUALITY || currentAudioQuality === null) {
      const availableQualities = player.getAvailableQualityLevels();
      const targetQualityIndex = availableQualities.indexOf(MAX_QUALITY);
      if (targetQualityIndex !== -1) {
        const targetQuality = availableQualities[targetQualityIndex];
        player.setPlaybackQuality(targetQuality);
      } else {
        throw new Error(`Target quality '${MAX_QUALITY}' not available.`);
      }
    }
 
    if (currentAudioQuality === null) {
      const availableAudioQualities = player.getAvailablePlaybackRates();
      const targetAudioQualityIndex = findBestAudioQualityIndex(availableAudioQualities);
      if (targetAudioQualityIndex !== -1) {
        const targetAudioQuality = availableAudioQualities[targetAudioQualityIndex];
        player.setPlaybackRate(targetAudioQuality);
      } else {
        throw new Error("No available audio qualities found.");
      }
    }
 
    setBassBoost(player, BASS_BOOST_LEVEL);
  } catch (error) {
    console.error("An error occurred:", error.message);
  }
}
 
function isPlayerAvailable(player) {
  return (
    player &&
    /https:\/\/www\.youtube\.com\/watch\?v=.*/.test(window.location.href) &&
    document.getElementById("live-chat-iframe") === null
  );
}
 
function findBestAudioQualityIndex(availableAudioQualities) {
  // Find the index of the highest available audio quality
  let maxQualityIndex = -1;
  let maxQuality = -Infinity;
  availableAudioQualities.forEach((quality, index) => {
    const qualityNumber = Number(quality);
    if (!isNaN(qualityNumber) && qualityNumber > maxQuality) {
      maxQuality = qualityNumber;
      maxQualityIndex = index;
    }
  });
  return maxQualityIndex;
}
 
function setBassBoost(player, level) {
  const bassBoostEffect = {
    name: "bassBoost",
    parameters: {
      gain: level,
    },
  };
  player.applyFilter(bassBoostEffect);
}
 
function getPlayer() {
  const player = document.getElementById("movie_player");
  if (!player) {
    throw new Error("YouTube player not found.");
  }
  return player;
}
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