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Twitch - Disable automatic video downscale

Disables the automatic downscaling of Twitch streams while tabbed away

  1. // ==UserScript==
  2. // @name         Twitch - Disable automatic video downscale
  3. // @namespace    CommanderRoot
  4. // @copyright    CommanderRoot
  5. // @license      Unlicense
  6. // @version      1.2.7
  7. // @description  Disables the automatic downscaling of Twitch streams while tabbed away
  8. // @author       https://twitter.com/CommanderRoot
  9. // @match        https://www.twitch.tv/*
  10. // @match        https://m.twitch.tv/*
  11. // @match        https://player.twitch.tv/*
  12. // @grant        none
  13. // @run-at       document-start
  14. // ==/UserScript==
  15. "use strict";
  16.  
  17.  
  18. // CONFIG start ------
  19. const doOnlySetting = false; // false = do some trickery with document hidden state / true = only set the localStorage option
  20. // CONFIG end --------
  21.  
  22.  
  23. // Code
  24. if (doOnlySetting === false) {
  25.   // Try to trick the site into thinking it's never hidden
  26.   Object.defineProperty(document, 'visibilityState', { value: 'visible', writable: false });
  27.   Object.defineProperty(document, 'webkitVisibilityState', { value: 'visible', writable: false });
  28.   document.hasFocus = function () { return true; };
  29.   const initialHidden = document.hidden;
  30.   let didInitialPlay = false;
  31.   let lastVideoPlaying = false;
  32.  
  33.   // visibilitychange events are captured and stopped
  34.   document.addEventListener('visibilitychange', function (e) {
  35.     if (document.hidden === false && initialHidden === true && didInitialPlay === false) {
  36.       // Allow propagation to prevent black screen when a stream was opened in a new tab
  37.     } else {
  38.       e.stopImmediatePropagation();
  39.     }
  40.     if (document.hidden) {
  41.       didInitialPlay = true;
  42.     }
  43.  
  44.     // Try to play the video on Chrome
  45.     if (typeof chrome !== 'undefined') {
  46.       if (document.hidden === true) {
  47.         const videos = document.getElementsByTagName('video');
  48.         if (videos.length > 0) {
  49.           lastVideoPlaying = !videos[0].paused && !videos[0].ended;
  50.         } else {
  51.           lastVideoPlaying = false;
  52.         }
  53.       } else {
  54.         playVideo();
  55.       }
  56.     }
  57.   }, true);
  58.  
  59.   function playVideo() {
  60.     const videos = document.getElementsByTagName('video');
  61.     if (videos.length > 0) {
  62.       if ((didInitialPlay === false || lastVideoPlaying === true) && !videos[0].ended) {
  63.         videos[0].play();
  64.         didInitialPlay = true;
  65.       }
  66.     }
  67.   }
  68. }
  69.  
  70. function setQualitySettings() {
  71.   // Set the player quality to "Source"
  72.   try {
  73.     window.localStorage.setItem('s-qs-ts', Math.floor(Date.now()));
  74.     window.localStorage.setItem('video-quality', '{"default":"chunked"}');
  75.   } catch (e) {
  76.     console.log(e);
  77.   }
  78. }
  79.  
  80. setQualitySettings();
  81.  
  82. // Add event handler for when we switch between pages
  83. // This is useful when we switch for example from a Clip
  84. // without "Source" to a livestream
  85. window.addEventListener('popstate', () => {
  86.   setQualitySettings();
  87. });

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