// ==UserScript==
// @name        HTML5 Video Playback Speed Control Keyboard Shortcut
// @namespace   HTML5VideoPlaybackSpeedControlKeyboardShortcut
// @description Add keyboard shortcuts to control HTML5 video playback rate. Available keyboard shortcuts are: <CTRL+[> = Decreate playback rate, <CTRL+]> = Increase playback rate, <CTRL+\> = Set playback rate increment/decrement unit, <CTRL+'> = Set playback to specific rate, <CTRL+;> Reset playback rate to default (to 1.0). Default playback rate incement/decrement is configurable via script.
// @version     1.2.7
// @license     AGPLv3
// @author      jcunews
// @website     https://greasyfork.org/en/users/85671-jcunews
// @include     http://*/*
// @include     https://*/*
// @grant       none
// ==/UserScript==
(function() {
/*
Notes:
1. YouTube's video playback speed menu selection will not be affected.
2. Web browser playback rates: Firefox = 0.25 to 5.0; Chrome = 0.1 to 16.0.
*/
//=== CONFIGURATION BEGIN ===
//Playback rate increment/decrement unit
var rateUnit    = 0.2;
//Duration (in milliseconds) to display On Screen Display (OSD) when changing playback rate. Set to zero or less to disable.
var osdTimeout  = 3000;
//=== CONFIGURATION END ===
var eleOSD, osdTimer;
function showOSD(rate) {
if (eleOSD) {
eleOSD.textContent = rate + "X";
} else {
eleOSD = document.createElement("DIV");
eleOSD.style.cssText = "position:fixed;z-index:999999999;right:5px;bottom:5px;margin:0;padding:5px;width:auto;height:auto;font:bold 10pt/normal monospace;background:#444;color:#fff";
eleOSD.textContent = rate + "X";
document.body.appendChild(eleOSD);
}
clearTimeout(osdTimer);
osdTimer = setTimeout(function() {
eleOSD.remove();
eleOSD = null;
}, osdTimeout);
}
addEventListener("keydown", function(ev) {
var ele = document.querySelector("VIDEO"), rate, inp;
if (ele && ev.ctrlKey && !ev.shiftKey && !ev.altKey) {
rate = rate = ele.playbackRate;
switch (ev.key) {
case "[":
rate -= rateUnit;
if (rate < 0.1) rate = 0.1;
break;
case "]":
rate += rateUnit;
if (rate > 16) rate = 16;
break;
case "\\":
if ((inp = prompt("Enter playback rate increment/decrement unit.", rateUnit)) === null) return;
if (isNaN(inp = parseFloat(inp.trim())) || (inp <= 0) || (inp > 4)) {
alert("Number must be greater than zero, and less or equal to 4.");
return;
}
rateUnit = inp;
return;
case "'":
if ((inp = prompt("Enter playback rate.\n(1.0 = Normal)", rate)) === null) return;
if (isNaN(inp = parseFloat(inp.trim())) || (inp < 0.1) || (inp > 16)) {
alert("Number must be between 0.1 to 16 (inclusive).");
return;
}
rate = inp;
break;
case ";":
rate = 1;
break;
default:
return;
}
rate = parseFloat(rate.toFixed(2));
ele.playbackRate = rate;
if (osdTimeout > 0) showOSD(ele.playbackRate);
}
});
})();