// ==UserScript==
// @name         YouTube audio compressor
// @namespace    https://eaguru.guru/
// @version      0.5.2
// @description  Adds an audio compressor option to YouTube videos. Now with over-engineering! Based on code by Vivelin and Wareya.
// @author       notwa
// @match        https://*.youtube.com/*
// @updateURL    https://gist.github.com/notwa/9b8466b0c2ca48d756afcd02a5e43739/raw/YouTube%2520audio%2520compressor.user.js
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(() => {
  "use strict";

  // Boolean:
  let boosterActive = false;
  let compressorActive = false;
  let fancyCompression = true;

  // AudioContext:
  let context = null;

  // AudioNode:
  let source = null;
  let gainIn = null;
  let filterIn = null;
  let compressor = null;
  let filterOut = null;
  let gainOut = null;
  let limiter = null;

  // DOM:
  let boosterMenuItem = null;
  let compressorMenuItem = null;

  // these filters very roughly approximate the inverse of ISO 226:2003 at 70 phons.
  // NOTE: these MUST have all zeros (and poles) within the unit circle,
  //       else the output signal will grow indefinitely (i.e. blow up).
  //       normally, only the poles of an IIR are subject to this constraint.
  //       however, as a quick 'n' dirty method to reverse the effect
  //       of the filters after compression, i am using their inverses,
  //       wherein the numerators and denominators are swapped.
  // TODO: reduce ringing.
  //
  // zeroth-degree terms are fixed at 1.0.
  //                1.0 + num_1 * z^-1 + num_2 * z^-2
  // H(z) = gain * -----------------------------------
  //                1.0 + den_1 * z^-1 + den_2 * z^-2
  //                 gain        num_1       num_2       den_1       den_2
  const iir44100 = [+0.4707103, -1.1384015, +0.1384129, -1.5989047, +0.6369472];
  const iir48000 = [+0.4560796, -1.1713186, +0.1713303, -1.6291792, +0.6617519];
  const iir88200 = [+0.3747475, -1.4029588, +0.4029728, -1.7895837, +0.8000784];
  const iir96000 = [+0.3665513, -1.4342713, +0.4342856, -1.8057964, +0.8147329];

  const iirs = {
    44100: iir44100,
    48000: iir48000,
    88200: iir88200,
    96000: iir96000
  }

  function createFilter(coeffs, flip, moreGain = 1.0) {
    const gain = flip ? moreGain / coeffs[0] : moreGain * coeffs[0];
    const b0 = gain;
    const b1 = gain * coeffs[flip ? 3 : 1];
    const b2 = gain * coeffs[flip ? 4 : 2];
    const a0 = 1.0;
    const a1 = coeffs[flip ? 1 : 3];
    const a2 = coeffs[flip ? 2 : 4];
    const num = [b0, b1, b2];
    const den = [a0, a1, a2];
    const filter = context.createIIRFilter(num, den);
    return filter;
  }

  function createMenuItem(title, defaultState) {
    const menuItem = document.createElement("div");
    menuItem.className = "ytp-menuitem";
    menuItem.setAttribute("role", "menuitemcheckbox");
    menuItem.setAttribute("aria-checked", "false");
    menuItem.tabIndex = 0;

    const icon = document.createElement("div");
    icon.className = "ytp-menuitem-icon";
    menuItem.appendChild(icon);

    const label = document.createElement("div");
    label.className = "ytp-menuitem-label";
    label.textContent = title;
    menuItem.appendChild(label);

    const toggleCheckbox = document.createElement("div");
    toggleCheckbox.className = "ytp-menuitem-toggle-checkbox";

    const content = document.createElement("div");
    content.className = "ytp-menuitem-content";
    content.appendChild(toggleCheckbox);
    menuItem.appendChild(content);

    if (defaultState && defaultState !== "false") {
      menuItem.setAttribute("aria-checked", "true");
    } else {
      menuItem.setAttribute("aria-checked", "false");
    }

    console.log(menuItem);
    return menuItem;
  }

  function ariaToggle(element) {
    const oldState = element.getAttribute("aria-checked");
    const newState = oldState === "false" ? true : false;
    element.setAttribute("aria-checked", newState.toString());
    return newState;
  }

  function reconnect() {
    if (source) source.disconnect();
    if (gainIn) gainIn.disconnect();
    if (filterIn) filterIn.disconnect();
    if (compressor) compressor.disconnect();
    if (filterOut) filterOut.disconnect();
    if (gainOut) gainOut.disconnect();
    if (limiter) limiter.disconnect();

    if (!source) return false;

    let sequence = [source];
    if (boosterActive || compressorActive) sequence.push(gainIn);
    if (compressorActive) {
      if (fancyCompression) sequence.push(filterIn);
      sequence.push(compressor);
      if (fancyCompression) sequence.push(filterOut);
    }
    if (boosterActive || compressorActive) sequence.push(gainOut);
    if (boosterActive) sequence.push(limiter);

    // hook it all up:
    sequence = sequence.filter((item) => item); // remove falsy (null) elements
    for (let i = 1; i < sequence.length; i++) {
      sequence[i - 1].connect(sequence[i]);
    }
    sequence.at(-1).connect(context.destination);

    let compDrive = 1.0;
    let limitDrive = 1.0;
    if (boosterActive && limiter) {
      compDrive *= 3.1622776601683795; // +10 dB
      if (compressorActive) {
        compDrive *= 0.7943282347242815; // -2 dB
        limitDrive *= 1.4125375446227544; // +3 dB
      }
    } else if (compressorActive) {
      compDrive *= 0.7079457843841379; // -3 dB
      limitDrive *= 0.7079457843841379; // -3 dB
    }
    gainIn.gain.setValueAtTime(compDrive, context.currentTime);
    gainOut.gain.setValueAtTime(limitDrive, context.currentTime);

    return true;
  }

  function setupCompressor(player, ytpPanelMenu) {
    if (!context) {
      context = new AudioContext();

      // load and register the limiter code:
      const uri = "data:text/javascript;base64,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";
      context.audioWorklet.addModule(uri).then(() => {
        limiter = new AudioWorkletNode(context, "limiter");
        console.info("Limiter successfully initialized.");
        reconnect();
      });
    }

    const iir = iirs[context.sampleRate];
    if (typeof iir === "undefined") {
      fancyCompression = false;
    }

    const now = context.currentTime;
    if (!source) {
      source = context.createMediaElementSource(player);
    }
    if (!gainIn) {
      gainIn = context.createGain();
      gainIn.gain.setValueAtTime(1.0, now);
    }
    if (!filterIn && fancyCompression) {
      filterIn = createFilter(iir, false, 2.0);
    }
    if (!compressor) {
      compressor = context.createDynamicsCompressor();
      compressor.threshold.setValueAtTime(-50, now);
      compressor.knee.setValueAtTime(40, now);
      compressor.ratio.setValueAtTime(12, now);
      compressor.attack.setValueAtTime(0.01, now);
      compressor.release.setValueAtTime(0.33, now);
    }
    if (!filterOut && fancyCompression) {
      filterOut = createFilter(iir, true, 0.5);
    }
    if (!gainOut) {
      gainOut = context.createGain();
      gainOut.gain.setValueAtTime(1.0, now);
    }

    if (!boosterMenuItem) {
      boosterMenuItem = createMenuItem("Level Boost", boosterActive);
      boosterMenuItem.onclick = () => {
        boosterActive = ariaToggle(boosterMenuItem);
        reconnect();
      };
      ytpPanelMenu.appendChild(boosterMenuItem);
    }

    if (!compressorMenuItem) {
      compressorMenuItem = createMenuItem("Compressor", compressorActive);
      compressorMenuItem.onclick = () => {
        compressorActive = ariaToggle(compressorMenuItem);
        reconnect();
      };
      ytpPanelMenu.appendChild(compressorMenuItem);
    }

    reconnect();
  }

  function attemptSetup() {
    const player = document.querySelector("#ytd-player video");
    const ytpPanelMenu = document.querySelector("#ytd-player .ytp-settings-menu .ytp-panel-menu");
    if (player && ytpPanelMenu) {
      setupCompressor(player, ytpPanelMenu);
      console.info("Compressor options added.");
      return true;
    }

    return false;
  }

  function trySetupLater() {
    console.debug("Polling for player...");

    const intervalId = window.setInterval(() => {
      if (attemptSetup()) {
        window.clearInterval(intervalId);
      }
    }, 100);

    const cancelId = window.setTimeout(() => {
      window.clearInterval(intervalId);
    }, 10000);
  }

  if (!attemptSetup()) {
    trySetupLater();
    window.addEventListener("yt-navigate-finish", trySetupLater);
  }
})();