YouTube: Force html5_exponential_memory_for_sticky

To prevent YouTube to change the video quality automatically during YouTube Live Streaming.
Ekde 2023/07/17. Vidu La ĝisdata versio.
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// ==UserScript==
// @name                YouTube: Force html5_exponential_memory_for_sticky
// @namespace           Violentmonkey Scripts
// @match               https://www.youtube.com/*
// @version             0.1.0
// @license             MIT
// @author              CY Fung
// @description         To prevent YouTube to change the video quality automatically during YouTube Live Streaming.
// @run-at              document-start
// @grant               none
// @unwrap
// @allFrames           true
// @inject-into         page
// ==/UserScript==

// html5_exponential_memory_for_sticky
/* "YouTube to change the video quality automatically during YouTube Live Streaming" refers to the following code:

k_=function(a){if(a.Tf){var b=a.Zi;var c=a.Tf;a=a.Dv();if(b.va.qt().isInline())var d=gO;else b.N("html5_exponential_memory_for_sticky")?d=.5>Jwa(b.Z.Wf,"sticky-lifetime")?"auto":TH[xL()]:d=TH[xL()],d=g.RH("auto",d,!1,"s");if(SH(d)){d=n_a(b,c);var e=d.compose,f;a:if((f=c.j)&&f.videoInfos.length){for(var h=g.u(f.videoInfos),l=h.next();!l.done;l=h.next()){l=l.value;var m=void 0;if(null==(m=l.u)?0:m.smooth){f=l.video.j;break a}}f=f.videoInfos[0].video.j}else f=0;Tma()&&!g.MM(b.Z)&&hI(c.j.videoInfos[0])&&
(f=Math.min(f,g.QH.large));d=e.call(d,new PH(0,f,!1,"o"));e=d.compose;f=4320;!b.Z.u||g.FM(b.Z)||b.Z.N("hls_for_vod")||b.Z.N("mweb_remove_360p_cap")||(f=g.QH.medium);(h=g.AL(b.Z.experiments,"html5_default_quality_cap"))&&c.j.j&&!c.videoData.aj&&!c.videoData.me&&(f=Math.min(f,h));h=g.AL(b.Z.experiments,"html5_random_playback_cap");l=/[a-h]$/;h&&l.test(c.videoData.clientPlaybackNonce)&&(f=Math.min(f,h));if(l=h=g.AL(b.Z.experiments,"html5_hfr_quality_cap"))a:{l=c.j;if(l.j)for(l=g.u(l.videoInfos),m=l.next();!m.done;m=
l.next())if(32<m.value.video.fps){l=!0;break a}l=!1}l&&(f=Math.min(f,h));(h=g.AL(b.Z.experiments,"html5_live_quality_cap"))&&c.videoData.isLivePlayback&&(f=Math.min(f,h));f=A_a(b,c,f);d=e.call(d,new PH(0,4320===f?0:f,!1,"d")).compose(z_a(b)).compose(B_a(b,c.videoData,c)).compose(y_a(b,c)).compose(q_a(b,c));SH(a)&&(d=d.compose(r_a(b,c)))}else b.N("html5_perf_cap_override_sticky")&&(d=d.compose(y_a(b,c))),b.N("html5_ustreamer_cap_override_sticky")&&(d=d.compose(r_a(b,c)));d=d.compose(q_a(b,c));b=c.videoData.Yx.compose(d).compose(c.videoData.lT).compose(a)}else b=
gO;return b};

*/

((__CONTEXT__) => {

  const { Promise, setTimeout, setInterval, clearInterval } = __CONTEXT__;

  let fw = false;
  let cid = setInterval(() => {

    let obj = null;
    try {
      obj = ytcfg.data_.WEB_PLAYER_CONTEXT_CONFIGS.WEB_PLAYER_CONTEXT_CONFIG_ID_KEVLAR_WATCH;
    } catch (e) { }
    if (!obj) return;
    Promise.resolve().then(() => clearInterval(cid));

    fw = true;
    if (typeof obj.serializedExperimentFlags === 'string') {
      if (obj.serializedExperimentFlags.indexOf('&h5_expr_b9Nkc=true') > 0) return;
      obj.serializedExperimentFlags = obj.serializedExperimentFlags.replace(/(^|&)html5_exponential_memory_for_sticky=\w+/, '') + '&html5_exponential_memory_for_sticky=true&h5_expr_b9Nkc=true';
    }

  }, 1);

  function onReady() {
    if (!fw) {
      setTimeout(() => {
        !fw && clearInterval(cid);
      }, 1000);
    }
  }

  Promise.resolve().then(() => {
    if (document.readyState !== 'loading') {
      onReady();
    } else {
      window.addEventListener("DOMContentLoaded", onReady, false);
    }
  });


})({ Promise, setTimeout, setInterval, clearInterval });