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使用 YouTube AV1

使用 AV1 进行 YouTube 视频播放

当前为 2023-08-19 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name                Use YouTube AV1
  3. // @description         Use AV1 for video playback on YouTube
  4. // @name:zh-TW          使用 YouTube AV1
  5. // @description:zh-TW   使用 AV1 進行 YouTube 影片播放
  6. // @name:zh-HK          使用 YouTube AV1
  7. // @description:zh-HK   使用 AV1 進行 YouTube 影片播放
  8. // @name:zh-CN          使用 YouTube AV1
  9. // @description:zh-CN   使用 AV1 进行 YouTube 视频播放
  10. // @name:ja             YouTube AV1 の使用
  11. // @description:ja      YouTube の動画再生に AV1 を使用する
  12. // @name:ko             YouTube AV1 사용
  13. // @description:ko      YouTube의 동영상 재생에 AV1을 사용하기
  14. // @name:vi             Sử dụng YouTube AV1
  15. // @description:vi      Sử dụng AV1 để phát video trên YouTube
  16. // @name:de             YouTube AV1 verwenden
  17. // @description:de      Verwende AV1 für die Videowiedergabe auf YouTube
  18. // @name:fr             Utiliser YouTube AV1
  19. // @description:fr      Utiliser AV1 pour la lecture des vidéos sur YouTube
  20. // @name:it             Usa YouTube AV1
  21. // @description:it      Usa AV1 per la riproduzione dei video su YouTube
  22. // @name:es             Usar AV1 en YouTube
  23. // @description:es      Usar AV1 para la reproducción de videos en YouTube
  24. // @namespace           http://tampermonkey.net/
  25. // @version             2.2.0
  26. // @author              CY Fung
  27. // @match               https://www.youtube.com/*
  28. // @match               https://www.youtube.com/embed/*
  29. // @match               https://www.youtube-nocookie.com/embed/*
  30. // @exclude             https://www.youtube.com/live_chat*
  31. // @exclude             https://www.youtube.com/live_chat_replay*
  32. // @exclude             /^https?://\S+\.(txt|png|jpg|jpeg|gif|xml|svg|manifest|log|ini)[^\/]*$/
  33. // @icon                https://www.google.com/s2/favicons?sz=64&domain=youtube.com
  34. // @grant               none
  35. // @run-at              document-start
  36. // @license             MIT
  37. //
  38. // @compatible          firefox Violentmonkey
  39. // @compatible          firefox Tampermonkey
  40. // @compatible          firefox FireMonkey
  41. // @compatible          chrome Violentmonkey
  42. // @compatible          chrome Tampermonkey
  43. // @compatible          opera Violentmonkey
  44. // @compatible          opera Tampermonkey
  45. // @compatible          safari Stay
  46. // @compatible          edge Violentmonkey
  47. // @compatible          edge Tampermonkey
  48. // @compatible          brave Violentmonkey
  49. // @compatible          brave Tampermonkey
  50. //
  51. // @unwrap
  52. // @allFrames           true
  53. // @inject-into         page
  54. // ==/UserScript==
  55.  
  56. /**
  57.  * 
  58.  * CAUTION:
  59.  *   This script will alter your site preference setting localStorage['yt-player-av1-pref'].
  60.  *   The modified setting will remain even if you have disabled or uninstalled the script.
  61.  * 
  62.  */
  63.  
  64.  
  65. (function (__Promise__) {
  66.   'use strict';
  67.  
  68.   /** @type {globalThis.PromiseConstructor} */
  69.   const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
  70.  
  71.   console.debug("force-youtube-av1", "injected");
  72.  
  73.   function enableAV1() {
  74.  
  75.  
  76.     // This is the setting to force AV1
  77.     // localStorage['yt-player-av1-pref'] = '8192';
  78.     try {
  79.       Object.defineProperty(localStorage.constructor.prototype, 'yt-player-av1-pref', {
  80.         get() {
  81.           if (this === localStorage) return '8192';
  82.           return this.getItem('yt-player-av1-pref');
  83.         },
  84.         set(nv) {
  85.           this.setItem('yt-player-av1-pref', nv);
  86.           return true;
  87.         },
  88.         enumerable: true,
  89.         configurable: true
  90.       });
  91.     } catch (e) {
  92.       // localStorage['yt-player-av1-pref'] = '8192';
  93.     }
  94.  
  95.     if (localStorage['yt-player-av1-pref'] !== '8192') {
  96.  
  97.       console.log('Use YouTube AV1 is not supported in your browser.');
  98.       return;
  99.     }
  100.  
  101.  
  102.     console.debug("force-youtube-av1", "AV1 enabled");
  103.  
  104.     let firstDa = true;
  105.     const { setInterval, clearInterval, setTimeout } = window;
  106.     let cid = setInterval.call(window, () => {
  107.  
  108.       const da = (window.ytcfg && window.ytcfg.data_) ? window.ytcfg.data_ : null;
  109.       if (!da) return;
  110.  
  111.       const isFirstDa = firstDa;
  112.       firstDa = false;
  113.  
  114.       const EXPERIMENT_FLAGS = da.EXPERIMENT_FLAGS || null;
  115.       if (EXPERIMENT_FLAGS) {
  116.         EXPERIMENT_FLAGS.html5_disable_av1_hdr = false;
  117.         EXPERIMENT_FLAGS.html5_prefer_hbr_vp9_over_av1 = false;
  118.         EXPERIMENT_FLAGS.html5_account_onesie_format_selection_during_format_filter = false;
  119.         // EXPERIMENT_FLAGS.html5_perf_cap_override_sticky = true;
  120.         // EXPERIMENT_FLAGS.html5_perserve_av1_perf_cap = true;
  121.       }
  122.  
  123.       if (isFirstDa) {
  124.  
  125.  
  126.         let mo = new MutationObserver(() => {
  127.  
  128.           mo.disconnect();
  129.           mo.takeRecords();
  130.           mo = null;
  131.           setTimeout(() => {
  132.             clearInterval.call(window, cid);
  133.           })
  134.         });
  135.         mo.observe(document, { subtree: true, childList: true });
  136.  
  137.  
  138.       }
  139.  
  140.  
  141.     });
  142.  
  143.  
  144.  
  145.     function typeTest(type) {
  146.  
  147.  
  148.       let disallowed_types = ['vp8', 'vp9'];
  149.       // mp4a is a container for AAC. In most cases (<192kbps), Opus is better than AAC.
  150.       // vp09 will be also disabled if av1 is enabled.
  151.       for (const disallowed_type of disallowed_types) {
  152.         if (type.includes(disallowed_type)) return false;
  153.       }
  154.  
  155.       let force_allow_types = ['av1', 'av01', 'hev1'];
  156.       // av1 is currently supported by Firefox and Chrome except Edge
  157.       for (const force_allow_type of force_allow_types) {
  158.         if (type.includes(force_allow_type)) return true;
  159.       }
  160.  
  161.     }
  162.  
  163.     // return a custom MIME type checker that can defer to the original function
  164.     function makeModifiedTypeChecker(origChecker) {
  165.       // Check if a video type is allowed
  166.       return function (type) {
  167.         let res = undefined;
  168.         if (type === undefined) res = false;
  169.         else {
  170.           res = typeTest(type);
  171.         }
  172.         if (res === undefined) res = origChecker.apply(this, arguments);
  173.  
  174.         // console.debug(20, type, res)
  175.  
  176.         return res;
  177.       };
  178.     }
  179.  
  180.     // Override video element canPlayType() function
  181.     const proto = (HTMLVideoElement || 0).prototype;
  182.     if (proto && typeof proto.canPlayType == 'function') {
  183.       proto.canPlayType = makeModifiedTypeChecker(proto.canPlayType);
  184.     }
  185.  
  186.     // Override media source extension isTypeSupported() function
  187.     const mse = window.MediaSource;
  188.     // Check for MSE support before use
  189.     if (mse && typeof mse.isTypeSupported == 'function') {
  190.       mse.isTypeSupported = makeModifiedTypeChecker(mse.isTypeSupported);
  191.     }
  192.  
  193.   }
  194.  
  195.  
  196.   let promise = null;
  197.  
  198.   function callback(result) {
  199.  
  200.     if (result && result.supported && result.smooth) enableAV1();
  201.     else {
  202.       console.warn("force-youtube-av1", 'Your browser does not support AV1. You might conside to use the latest version of Google Chrome or Mozilla FireFox.');
  203.  
  204.     }
  205.   }
  206.  
  207.  
  208.   try {
  209.     promise = navigator.mediaCapabilities.decodingInfo({
  210.       type: "file",
  211.       video: {
  212.         contentType: "video/mp4; codecs=av01.0.05M.08.0.110.05.01.06.0",
  213.         height: 1080,
  214.         width: 1920,
  215.         framerate: 30,
  216.         bitrate: 2826848,
  217.       },
  218.       audio: {
  219.         contentType: "audio/webm; codecs=opus",
  220.         channels: "2.1",
  221.         samplerate: 44100,
  222.         bitrate: 255236,
  223.       }
  224.     }).then(callback).catch(callback);
  225.  
  226.   } catch (e) {
  227.     promise = null;
  228.   }
  229.  
  230.   if (!promise) promise = Promise.resolve(0).then(callback).catch(callback);
  231.  
  232.  
  233.  
  234.  
  235. })(Promise);