Enhances the volume control on YouTube by providing additional information and features.
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// ==UserScript==
// @name YouTube Volume Assistant
// @namespace http://tampermonkey.net/
// @version 0.1.1
// @description Enhances the volume control on YouTube by providing additional information and features.
// @author CY Fung
// @license MIT License
// @match https://www.youtube.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant none
// @run-at document-start
// @unwrap
// @allFrames
// @inject-into page
// ==/UserScript==
(function () {
'use strict';
// AudioContext.prototype._createGain = AudioContext.prototype.createGain;
let wm = new WeakMap();
/*
AudioContext.prototype.createGain = function(...args){
return this.createdGain || (this.createdGain = this._createGain(...args));
}
*/
function getMediaElementSource() {
return wm.get(this) || null;
}
function getGainNode() {
return wm.get(this) || null;
}
AudioContext.prototype._createMediaElementSource = AudioContext.prototype.createMediaElementSource;
AudioContext.prototype.createMediaElementSource = function (video, ...args) {
let createdMediaElementSource = wm.get(video);
if (createdMediaElementSource) return createdMediaElementSource;
wm.set(video, createdMediaElementSource = this._createMediaElementSource(video, ...args));
video.getMediaElementSource = getMediaElementSource;
return createdMediaElementSource;
}
MediaElementAudioSourceNode.prototype._connect = MediaElementAudioSourceNode.prototype.connect;
MediaElementAudioSourceNode.prototype.connect = function (gainNode, ...args) {
this._connect(gainNode, ...args);
wm.set(this, gainNode);
this.getGainNode = getGainNode;
}
let finished = false;
const onNavigateFinish = () => {
if (finished) return;
finished = true;
document.removeEventListener('yt-navigate-finish', onNavigateFinish, true);
document.head.appendChild(document.createElement('style')).textContent = `
.video-tip-offseted {
margin-top:-1em;
}
.volume-tip-gain{
opacity:0.52;
}
.volume-tip-normalized{
opacity:0.4;
}
`;
setTimeout(() => {
let volumeSlider = document.querySelector('.ytp-volume-panel[role="slider"][title]');
let volumeTitle = volumeSlider.getAttribute('title');
function addDblTap(element, doubleClick) {
// https://stackoverflow.com/questions/45804917/dblclick-doesnt-work-on-touch-devices
let expired
let doubleTouch = function (e) {
if (e.touches.length === 1) {
if (!expired) {
expired = e.timeStamp + 400
} else if (e.timeStamp <= expired) {
// remove the default of this event ( Zoom )
e.preventDefault()
doubleClick(e)
// then reset the variable for other "double Touches" event
expired = null
} else {
// if the second touch was expired, make it as it's the first
expired = e.timeStamp + 400
}
}
}
element.addEventListener('touchstart', doubleTouch)
element.addEventListener('dblclick', doubleClick)
}
addDblTap(volumeSlider, (e) => {
let target = null;
try {
target = e.target.closest('.ytp-volume-area').querySelector('.ytp-mute-button');
} catch (e) { }
console.log(target)
const e2 = new MouseEvent('contextmenu', {
bubbles: true,
cancelable: true,
view: window
});
if (target) target.dispatchEvent(e2);
})
let volumeSpan = null;
let lastContent = null;
let video = document.querySelector('#player video[src]');
let source = null;
let gainNode = null;
video.addEventListener('volumechange', changeVolumeText, false)
let ktid = 0;
let template = document.createElement('template');
function changeVolumeText() {
let video = document.querySelector('#player video[src]');
if (!video) return;
if (gainNode === null) {
source = video.getMediaElementSource ? video.getMediaElementSource() : null;
if (source) {
gainNode = source.getGainNode ? source.getGainNode() : null;
}
}
let gainValue = (((gainNode || 0).gain || 0).value || 0);
let m = gainValue || 1.0;
let actualVolume = document.querySelector('ytd-player').player_.getVolume();
let normalized = video.volume * 100;
let gainText = gainValue ? `<span class="volume-tip-gain">Gain = ${+(gainValue.toFixed(2))}</span><br>` : '';
template.innerHTML = `
<span class="volume-tip-offset">
${gainText}
<span class="volume-tip-volume">Volume: ${(m * actualVolume).toFixed(1)}% </span><br>
<span class="volume-tip-normalized"> Normalized: ${(m * normalized).toFixed(1)}%</span>
</span>`.trim();
if (volumeSpan.textContent !== template.content.textContent && lastContent === volumeSpan.textContent) {
volumeSpan.innerHTML = template.innerHTML;
lastContent = volumeSpan.textContent;
}
}
setInterval(() => {
if (!volumeSpan) {
let elms = [...document.querySelectorAll('#player .ytp-tooltip div.ytp-tooltip-text-wrapper span.ytp-tooltip-text')];
elms = elms.filter(t => t.textContent === volumeTitle);
if (elms[0]) {
HTMLElement.prototype.closest.call(elms[0],'#player .ytp-tooltip').classList.add('video-tip-offseted');
volumeSpan = elms[0];
lastContent = volumeSpan.textContent;
}
}
if (volumeSpan && (!volumeSpan.isConnected || volumeSpan.textContent !== lastContent)) {
// volumeSpan.textContent = volumeTitle;
let p = document.querySelector('.video-tip-offseted');
if(p) p.classList.remove('video-tip-offseted');
let m = document.querySelector('.volume-tip-offset');
if(m) m.remove();
volumeSpan = null;
lastContent = null;
}
if (!volumeSpan) return;
let tid = Date.now();
ktid = tid;
requestAnimationFrame(() => {
if (ktid !== tid) return;
changeVolumeText();
});
}, 80)
}, 300);
};
document.addEventListener('yt-navigate-finish', onNavigateFinish, true);
})();