Add keyboard shortcuts that will increase/decrease the playback rate for video elements.
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// ==UserScript==
// @name Video Element Rate Controller Re-dux
// @namespace https://github.com/mirnhoj/video-element-playbackrate-setter
// @version 2.2
// @description Add keyboard shortcuts that will increase/decrease the playback rate for video elements.
// @include http*://*.youtube.com/*
// @include http*://*.gfycat.com/*
// @include http*://*.vimeo.com/*
// @include https://www.facebook.com/video.php*
// @include https://www.facebook.com/*/videos/*
// @include https://www.kickstarter.com/*
// @require https://cdnjs.cloudflare.com/ajax/libs/big.js/5.1.2/big.js
// @grant GM_registerMenuCommand
// ==/UserScript==
/* jshint esversion: 6 */
//
// if you want to extend the functionality of this script to other sites
// besides youtube, add additional @include keys to the metadata block.
//
// if you want to change the default playback rate from 1x, change the line
// "var currentPlaybackRate = 1;" to equal something other than 1, like 1.3 to
// have all videos start playing at an increased speed, or 0.7 to have all
// videos start playing at a decreased speed.
//
// if you want change the granularity of the playback rate adjustment, change
// the line "var speedStep = 0.1;" to equal something other than 0.1, like 0.01
// for more granular adjustments, or 0.25 for less granular adjustments.
// These values are the default values for initialization
let speedStep = 0.1;
let displayTimeMilliSec = 1500;
let enhancerExtention = true;
let pref = 'preference-changed';
let eventName = 'speed';
let timeoutID;
const infobox = document.createElement('h1');
let showDisplay = false;
let keyIncreaseSpeed = ']';
let keyReduceSpeed = '[';
let keyResetSpeed = '\\';
function getVal(variable) {
let value;
let storage = (localStorage || (sessionStorage ||
(window.content.localStorage ? window.content.localStorage : null)));
try {
switch (variable) {
case 'speedStep':
value = storage.getItem('VERCRspeedStep');
// console.log('Variable "' + variable + '" is ' + value);
return Number(value);
case 'displayTimeMilliSec':
value = storage.getItem('VERCRdisplayTimeMS');
// console.log('Variable "' + variable + " is " + value);
return Number(value);
case 'enhancerExtention':
value = storage.getItem('VERCRenhancerExtention');
// console.log('Variable "' + variable + " is " + value);
return value;
case 'pref':
value = storage.getItem('VERCRpref');
// console.log('Variable "' + variable + " is " + value);
return value;
case 'eventName':
value = storage.getItem('VERCReventName');
// console.log('Variable "' + variable + " is " + value);
return value;
case 'keyIncreaseSpeed':
return value;
case 'keyReduceSpeed':
return value;
case 'keyResetSpeed':
return value;
default:
return null;
}
} catch (e) {
if (e.name === 'NS_ERROR_FILE_CORRUPTED') {
storage = sessionStorage || null; // set the new storage if fails
storage.setItem('VERCRspeedStep', speedStep);
storage.setItem('VERCRdisplayTimeMS', displayTimeMilliSec);
storage.setItem('VERCRenhancerExtention', enhancerExtention);
storage.setItem('VERCRpref', pref);
storage.setItem('VERCReventName', eventName);
}
}
}
function setVal(variable, value) {
let storage = (localStorage || (sessionStorage ||
(window.content.localStorage ? window.content.localStorage : null)));
try {
switch (variable) {
case 'speedStep':
storage.setItem('VERCRspeedStep', Number(value));
console.log(`Setting "${variable}" to ${value}`);
return value;
case 'displayTimeMilliSec':
storage.setItem('VERCRdisplayTimeMS', Number(value));
console.log(`Setting "${variable}" to ${value}`);
return value;
case 'enhancerExtention':
storage.setItem('VERCRenhancerExtention', value);
console.log(`Setting "${variable}" to ${value}`);
return value;
case 'pref':
storage.setItem('VERCRpref', value);
console.log(`Setting "${variable}" to ${value}`);
return value;
case 'eventName':
storage.setItem('VERCReventName', value);
console.log(`Setting "${variable}" to ${value}`);
return value;
default:
return null;
}
} catch (e) {
if (e.name === 'NS_ERROR_FILE_CORRUPTED') {
storage = sessionStorage || null; // set the new storage if fails
storage.setItem('VERCRspeedStep', speedStep);
storage.setItem('VERCRdisplayTimeMS', displayTimeMilliSec);
storage.setItem('VERCRenhancerExtention', enhancerExtention);
storage.setItem('VERCRpref', pref);
storage.setItem('VERCReventName', eventName);
}
}
}
function GMsetup() {
if (GM_registerMenuCommand) {
GM_registerMenuCommand('Video Rate Re-dux: Set adjustment rate', () => {
const curEntry = getVal('speedStep');
speedStep = prompt('New adjustment rate:\n(e.g., 0.1 = 10% faster)', curEntry);
if (speedStep !== null) {
while (isNaN(speedStep)) {
speedStep = prompt('Please input a valid number!\n\nNew adjustment rate:\n(e.g., 0.1 = 10% faster)', curEntry);
}
setVal('speedStep', speedStep);
}
});
// GM_registerMenuCommand('Video Rate Re-dux: Set keyboard shortcuts', () => {
// const curEntry = `${getVal('keyIncreaseSpeed')}, ${getVal('keyReduceSpeed')}, ${getVal('keyResetSpeed')}`;
// // W.I.P.
// });
GM_registerMenuCommand('Video Rate Re-dux: Set display timeout', () => {
const curEntry = getVal('displayTimeMilliSec');
displayTimeMilliSec = prompt('New display timeout length (in milliseconds):', curEntry);
if (displayTimeMilliSec !== null) {
while (isNaN(displayTimeMilliSec)) {
displayTimeMilliSec = prompt('Please input a valid number!\n\nNew display timeout length (in milliseconds):', curEntry);
}
setVal('displayTimeMilliSec', displayTimeMilliSec);
}
});
GM_registerMenuCommand('Video Rate Re-dux: Set extention usage', () => {
let curEntry = getVal('enhancerExtention');
curEntry = curEntry === true ? 'Yes' : 'No';
enhancerExtention = prompt('Are you using Enhancer for YouTube?:', curEntry);
if (enhancerExtention !== null) {
if (typeof (enhancerExtention) === 'string') {
const regex = /ye?s?|true|i am/i;
enhancerExtention = regex.test(enhancerExtention);
const enhancerExtentionOutput = regex.test(enhancerExtention) === true ? 'Yes' : 'No';
alert(`Extention use has been set to: "${enhancerExtentionOutput}"\n`);
} else {
enhancerExtention = false;
}
setVal('enhancerExtention', enhancerExtention);
}
});
}
}
function init() {
let VERCRspeedStep = localStorage.getItem('VERCRspeedStep');
let VERCRdisplayTimeMS = localStorage.getItem('VERCRdisplayTimeMS');
let VERCRenhancerExtention = localStorage.getItem('VERCRenhancerExtention');
let VERCRpref = localStorage.getItem('VERCRpref');
let VERCReventName = localStorage.getItem('VERCReventName');
if (!VERCRspeedStep) {
VERCRspeedStep = speedStep;
localStorage.setItem('VERCRspeedStep', Number(VERCRspeedStep));
}
if (!VERCRdisplayTimeMS) {
VERCRdisplayTimeMS = displayTimeMilliSec;
localStorage.setItem('VERCRdisplayTimeMS', Number(VERCRdisplayTimeMS));
}
if (!VERCRenhancerExtention) {
VERCRenhancerExtention = enhancerExtention;
localStorage.setItem('VERCRenhancerExtention', VERCRenhancerExtention);
}
if (!VERCRpref) {
VERCRpref = pref;
localStorage.setItem('VERCRpref', VERCRpref);
}
if (!VERCReventName) {
VERCReventName = 'speed';
localStorage.setItem('VERCReventName', VERCReventName);
}
}
function showInfobox(rate) {
const bigRate = new Big(rate);
// update rate indicator.
infobox.innerHTML = `${bigRate}x`;
// show infobox
infobox.style.visibility = 'visible';
// clear out any previous timers and have the infobox hide after the pre-set time period
window.clearTimeout(timeoutID);
timeoutID = window.setTimeout(() => {
infobox.style.visibility = 'hidden';
}, getVal('displayTimeMilliSec'));
}
function setPlaybackRate(rate, shouldShowInfobox) {
showDisplay = false;
// grab the video elements and set their playback rate.
const videoElement = document.getElementsByTagName('video')[0];
videoElement.playbackRate = rate;
// add infobox to dom if it doesn't already exist.
if (videoElement && !document.getElementById('playbackrate-indicator')) {
videoElement.parentElement.appendChild(infobox);
}
if (shouldShowInfobox) {
showInfobox(rate);
}
}
// mimic vlc keyboard shortcuts
function addKeyListener() {
window.addEventListener('keydown', (event) => {
const key = event.key;
const videoElement = document.getElementsByTagName('video')[0];
let currentPlaybackRate = new Big(videoElement.playbackRate);
speedStep = new Big(getVal('speedStep'));
if (key === keyReduceSpeed) {
// decrease playback rate if '[' is pressed
// currentPlaybackRate -= speedStep;
currentPlaybackRate = currentPlaybackRate.minus(speedStep);
// console.log('Setting "currentPlaybackRate" to ' + currentPlaybackRate);
showDisplay = true;
setPlaybackRate(currentPlaybackRate, showDisplay);
} else if (key === keyIncreaseSpeed) {
// increase playback rate if ']' is pressed
// currentPlaybackRate += speedStep;
currentPlaybackRate = currentPlaybackRate.add(speedStep);
// console.log('Setting "currentPlaybackRate" to ' + currentPlaybackRate);
showDisplay = true;
setPlaybackRate(currentPlaybackRate, showDisplay);
} else if (key === keyResetSpeed) {
// reset playback rate to default (1) if '\' is pressed
currentPlaybackRate = 1;
showDisplay = true;
setPlaybackRate(currentPlaybackRate, showDisplay);
}
if (getVal('enhancerExtention') === true) {
pref = getVal('pref');
eventName = getVal('eventName');
window.postMessage({
enhancerforyoutube: pref,
name: eventName,
value: currentPlaybackRate,
}, '*');
}
});
}
// show the current speed display on the video when mouse wheel is rolled on the speed element if using Enhancer For Youtube
function addWheelListener() {
const enhancerToolbar = document.getElementById('enhancer-for-youtube-toolbar');
const enhancerToolbarChildren = enhancerToolbar.children[0].children;
let speedChild;
eventName = getVal('eventName');
for (let i = 0; i < enhancerToolbarChildren.length; i++) {
if (enhancerToolbarChildren[i].dataset.name === eventName) {
speedChild = enhancerToolbarChildren[i];
}
}
if (speedChild) {
speedChild.addEventListener('wheel', (event) => {
const wDelta = event.wheelDelta < 0 ? 'down' : 'up';
const videoElement = document.getElementsByTagName('video')[0];
const currentPlaybackRate = videoElement.playbackRate;
switch (wDelta) {
case 'down':
// currentPlaybackRate -= speedStep; // uncomment to actually modify the playback speed
showInfobox(currentPlaybackRate);
break;
case 'up':
// currentPlaybackRate += speedStep; // uncomment to actually modify the playback speed
showInfobox(currentPlaybackRate);
break;
default:
break;
}
});
}
}
function onExtentionReady() {
addWheelListener();
}
async function onReady() {
addKeyListener();
if (getVal('enhancerExtention') === true) {
let i = 0;
do {
await wait(200);
i++;
} while (!document.getElementById('enhancer-for-youtube-toolbar') && i < 50);
onExtentionReady(); // Or setTimeout(onReady, 0); if you want it consistently async
}
}
function wait(time) {
return new Promise((resolve) => {
setTimeout(() => {
resolve();
}, time);
});
}
function Ext_Detect_NotInstalled(ExtName, ExtID, obj) {
console.log(`${ExtName} Not Installed`);
setVal('enhancerExtention', false);
obj.parentNode.removeChild(obj);
}
function Ext_Detect_Installed(ExtName, ExtID, obj) {
console.log(`${ExtName} Installed`);
setVal('enhancerExtention', true);
obj.parentNode.removeChild(obj);
}
const Ext_Detect = function (ExtName, ExtID) {
const IsFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
const IsChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
if (IsFirefox === true) {
const sMoz = document.createElement('script');
sMoz.onload = function () { Ext_Detect_Installed(ExtName, ExtID, sMoz); };
sMoz.onerror = function () { Ext_Detect_NotInstalled(ExtName, ExtID, sMoz); };
sMoz.src = `moz-extension://${ExtID}/resources/youtube-polymer.js`;
document.body.appendChild(sMoz);
} else if (IsChrome === true) {
const sChrome = document.createElement('script');
sChrome.onload = function () { Ext_Detect_Installed(ExtName, ExtID); };
sChrome.onerror = function () { Ext_Detect_NotInstalled(ExtName, ExtID); };
sChrome.src = `chrome-extension://${ExtID}/resources/youtube-polymer.js`;
document.body.appendChild(sChrome);
}
};
function main() {
init();
// window.onload = function() { Ext_Detect("Enhancer for YouTube", addonID); };
GMsetup();
infobox.setAttribute('id', 'playbackrate-indicator');
infobox.style.position = 'absolute';
infobox.style.top = '10%';
infobox.style.right = '10%';
infobox.style.color = 'rgba(255, 0, 0, 1)';
infobox.style.zIndex = '99999'; // ensures that it shows above other elements.
infobox.style.visibility = 'hidden';
infobox.style.marginTop = '3%';
if (document.readyState !== 'loading') {
onReady(); // Or setTimeout(onReady, 0); if you want it consistently async
} else {
document.addEventListener('DOMContentLoaded', onReady);
}
}
main();