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Miigon's Youtube script

useful enhancements for my own youtube enjoyments

  1. // ==UserScript==
  2. // @name         Miigon's Youtube script
  3. // @namespace    https://blog.miigon.net/
  4. // @version      0.6
  5. // @description  useful enhancements for my own youtube enjoyments
  6. // @author       Miigon
  7. // @match        https://www.youtube.com/*
  8. // @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
  9. // @grant        none
  10. // @license      MIT
  11. // ==/UserScript==
  12.  
  13. /* Long press right arrow key to speed up video playback */
  14. const RIGHT_ARROW_SPEEDUP_PRESS_TIME_MS = 500; // key hold time before speeding up
  15. const SPEED_UP_PLAYBACK_RATE = 3;
  16. /* Seeking in youtube shorts */
  17. const SHORTS_SEEK_SECS = 5;
  18.  
  19. (function() {
  20.     'use strict';
  21.  
  22.     let mlog = (...args)=>{console.log("miigon's ytb script:", ...args)}
  23.  
  24.     let right_pressed = false;
  25.     let is_speeding_up = false;
  26.     let speeding_timeout = -1; // timeout waiting before starting speeding up
  27.     let last_playback_rate = 1;
  28.  
  29.     let is_shorts = () => window.location.href.includes("/shorts/");
  30.     let is_editing = () => document.activeElement.contentEditable == "true";
  31.  
  32.     // youtube uses javascript to navigate around.
  33.     // so cached_player is only valid if the page is still the same.
  34.     let cached_player_href = null;
  35.     let cached_player = null;
  36.     let getPlayerElement = () => {
  37.         if(window.location.href == cached_player_href && cached_player) {
  38.             return cached_player;
  39.         }
  40.  
  41.         mlog("invalidate player element cache")
  42.         cached_player = null;
  43.         let ytd_player = [...document.getElementsByTagName("ytd-player")];
  44.         if(is_shorts()) {
  45.             cached_player = ytd_player.find(v=>v.className.indexOf("ytd-shorts")!=-1);
  46.         } else { // normal full-length video
  47.             cached_player = ytd_player.find(v=>
  48.                 v.className.indexOf("preview") == -1
  49.                 && v.className.indexOf("ytd-shorts") == -1
  50.             );
  51.         }
  52.         if(cached_player != null) {
  53.             cached_player_href = window.location.href;
  54.         }
  55.         return cached_player;
  56.     }
  57.     let getPlayer = () => getPlayerElement().getPlayer();
  58.     let getPlayerVideoTag = () => getPlayerElement().getElementsByTagName("video")[0];
  59.  
  60.  
  61.  
  62.     document.addEventListener("keydown", (e)=>{
  63.         let used = false;
  64.  
  65.         // skip hotkeys when editing comment etc.
  66.         if(is_editing()) return;
  67.  
  68.         if(e.key === "ArrowLeft") {
  69.             // enables left seeking in shorts
  70.             // ArrowRight is handled in keyup instead of keydown.
  71.             if(is_shorts()){
  72.                 getPlayer().seekBy(-SHORTS_SEEK_SECS);
  73.             }
  74.         }
  75.  
  76.         if(e.miigon_ignore) {
  77.             return;
  78.         }
  79.  
  80.         if(e.key === "ArrowRight") {
  81.             if(right_pressed == false){
  82.                 right_pressed = true;
  83.                 mlog("right pressed");
  84.                 speeding_timeout = setTimeout(()=>{
  85.                     speeding_timeout = -1;
  86.                     is_speeding_up = true;
  87.                     let v = getPlayerVideoTag();
  88.                     last_playback_rate = v.playbackRate;
  89.                     v.playbackRate = SPEED_UP_PLAYBACK_RATE;
  90.                     mlog("speeding up");
  91.  
  92.                     used = true;
  93.                 }, RIGHT_ARROW_SPEEDUP_PRESS_TIME_MS);
  94.             }
  95.             used = true;
  96.         }
  97.  
  98.         if(used){
  99.             e.stopPropagation();
  100.             e.preventDefault();
  101.         }
  102.     }, /*useCapture*/true);
  103.  
  104.     document.addEventListener("keyup", (e)=>{
  105.         let used = false;
  106.  
  107.         // skip hotkeys when editing comment etc.
  108.         if(is_editing()) return;
  109.  
  110.         if(e.key === "ArrowRight") {
  111.             right_pressed = false;
  112.             if(speeding_timeout != -1) { // keyup before speeding up begins
  113.                 clearTimeout(speeding_timeout);
  114.                 speeding_timeout = -1;
  115.  
  116.                 if(is_shorts()){
  117.                     // shorts, so simulating a right arrow keypress wont work
  118.                     // tell the player to seek directly.
  119.                     // this enables right seeking in shorts
  120.                     getPlayer().seekBy(SHORTS_SEEK_SECS);
  121.                 } else { // normal video
  122.                     // dispatch a normal right arrow keypress event.
  123.                     let event = new KeyboardEvent("keydown", {keyCode: 39})
  124.                     event.miigon_ignore = true; // the script should not process this event
  125.                     document.dispatchEvent(event);
  126.                 }
  127.             }
  128.             if(is_speeding_up) { // keyup after speeding up begins
  129.                 is_speeding_up = false;
  130.                 mlog("stop speeding up");
  131.                 getPlayerVideoTag().playbackRate = last_playback_rate;
  132.                 used = true;
  133.             }
  134.         }
  135.  
  136.         if(used){
  137.             e.stopPropagation();
  138.             e.preventDefault();
  139.         }
  140.     }, /*useCapture*/true);
  141. })();

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