Add playback speed controls to plex web player with keyboard shortcuts
// ==UserScript==
// @name Plex Playback Speed
// @namespace https://github.com/ZigZagT
// @version 1.4.0
// @description Add playback speed controls to plex web player with keyboard shortcuts
// @author ZigZagT
// @include /^https?://[^/]*plex[^/]*/
// @include /^https?://[^/]*:32400/
// @match https://app.plex.tv/
// @match https://plex.tv/
// @license MIT
// ==/UserScript==
(function() {
'use strict';
const console_log = (...args) => {
console.log(`PlexPlaybackSpeed:`, ...args)
}
const cycleSpeeds = [
0.5, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.5, 3, 3, 5, 4, 5, 6, 7, 8, 9, 10, 15, 20
];
const quickSetSpeeds = {
1: 1,
2: 1.5,
3: 2,
4: 3,
5: 4,
6: 5,
7: 7,
8: 8,
9: 10,
};
let currentSpeed = 1;
function prompt(txt) {
const existingPrompt = document.querySelector("#playback-speed-prompt");
if (existingPrompt) {
document.body.removeChild(existingPrompt);
}
const prompt = document.createElement("div");
prompt.id = "playback-speed-prompt";
prompt.innerText = txt;
document.body.appendChild(prompt);
prompt.style = `
position: fixed;
top: 0;
left: 0;
width: 8em;
height: 2em;
background-color: rgba(0, 0, 0, 0.5);
color: white;
font-size: 2em;
text-align: center;
z-index: 99999;
pointer-events: none;
`;
setTimeout(() => {
try {
document.body.removeChild(prompt);
} catch (e) {}
}, 2000);
}
function setVideoSpeed(speed) {
currentSpeed = speed;
}
function syncVideoSpeed() {
const videoElem = document.querySelector("video");
if (videoElem == null) {
return;
}
if (videoElem.playbackRate != currentSpeed) {
console_log(`setting playbackRate to ${currentSpeed} for`, videoElem);
videoElem.playbackRate = currentSpeed;
}
}
function getNextCycleSpeed(direction, currentSpeed) {
let newSpeed = currentSpeed;
for (const speed of cycleSpeeds) {
if (direction === 'slowdown') {
if (speed < currentSpeed) {
newSpeed = speed;
} else {
break;
}
} else if (direction === 'speedup') {
if (speed > currentSpeed) {
newSpeed = speed;
break;
}
} else {
console.error(`invalid change speed direction ${direction}`)
break;
}
}
return newSpeed;
}
function keyboardUpdateSpeed(e) {
let newSpeed = currentSpeed;
console_log({currentSpeed, key: e.key});
if (e.key in quickSetSpeeds) {
newSpeed = quickSetSpeeds[e.key];
} else if (["<", ","].includes(e.key)) {
newSpeed = getNextCycleSpeed('slowdown', currentSpeed);
} else if ([">", "."].includes(e.key)) {
newSpeed = getNextCycleSpeed('speedup', currentSpeed);
} else {
return;
}
console_log('change speed to', newSpeed);
setVideoSpeed(newSpeed);
prompt(`Speed: ${newSpeed}x`);
}
function btnSpeedUpFn() {
let newSpeed = getNextCycleSpeed('speedup', currentSpeed);
console_log('change speed to', newSpeed);
setVideoSpeed(newSpeed);
prompt(`Speed: ${newSpeed}x`);
}
function btnSlowdownFn() {
let newSpeed = getNextCycleSpeed('slowdown', currentSpeed);
console_log('change speed to', newSpeed);
setVideoSpeed(newSpeed);
prompt(`Speed: ${newSpeed}x`);
}
function addPlaybackButtonControls() {
const btnStyle = `
align-items: center;
border-radius: 15px;
display: flex;
font-size: 18px;
height: 30px;
justify-content: center;
margin-left: 5px;
text-align: center;
width: 30px;
`;
const containers = document.querySelectorAll('[class*="PlayerControls-buttonGroupRight"]');
containers.forEach(container => {
if (container.querySelector('#playback-speed-btn-slowdown')) {
return;
}
const btnSlowDown = document.createElement('button');
btnSlowDown.id = 'playback-speed-btn-slowdown';
btnSlowDown.style = btnStyle;
btnSlowDown.innerHTML = '🐢';
btnSlowDown.addEventListener('click', btnSlowdownFn);
const btnSpeedUp = document.createElement('button');
btnSpeedUp.id = 'playback-speed-btn-speedup';
btnSpeedUp.style = btnStyle;
btnSpeedUp.innerHTML = '🐇';
btnSpeedUp.addEventListener('click', btnSpeedUpFn);
console_log('adding speed controls to', container);
container.prepend(btnSlowDown, btnSpeedUp);
})
}
function scheduleLoopFrame() {
setTimeout(() => {
requestAnimationFrame(() => {
syncVideoSpeed();
addPlaybackButtonControls();
scheduleLoopFrame();
});
}, 500);
}
if (window.__plex_playback_speed_control_registered__) {
console_log('plex playback speed controls are already registered');
} else {
window.__plex_playback_speed_control_registered__ = true;
console_log('registering plex playback speed controls');
window.addEventListener("keydown", keyboardUpdateSpeed);
scheduleLoopFrame();
}
})();