Add YouTube Video Progress

Add progress bar at bottom of YouTube video and progress text on the video page. On the progress text, the current video quality will have a "+" suffix if there's a higher one available. Hovering the mouse cursor onto the video quality text will show the current and available video quality IDs.
当前为 2019-04-06 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Add YouTube Video Progress
// @namespace    https://gf.qytechs.cn/en/users/85671-jcunews
// @version      1.2.11
// @license      GNU AGPLv3
// @author       jcunews
// @description  Add progress bar at bottom of YouTube video and progress text on the video page. On the progress text, the current video quality will have a "+" suffix if there's a higher one available. Hovering the mouse cursor onto the video quality text will show the current and available video quality IDs.
// @match        https://www.youtube.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

//===== CONFIGURATION BEGIN =====

var progressbarHeight       = 2; //in pixels
var progressbarColor        = "#fff"; //e.g. "#fff" or "#e0e0e0" or "cyan"
var progressbarElapsedColor = "#f00";
var progressbarBufferColor  = "#77f";
var contentLoadProcessDelay = 0; //number of milliseconds before processing dynamically loaded contents (increase if slow network/browser)

//===== CONFIGURATION END =====

var timerWaitInfo, timerProgressMonitor, timerWaitPlayer, timerDoubleCheck, playerManager;

function processInfo() {
  if (window.vidprogress || (location.pathname !== "/watch")) return;
  clearTimeout(timerWaitInfo);
  (function waitInfo(a, b) {
    if (a = document.querySelector("#info-contents #info, #watch7-user-header")) {
      b = document.createElement("SPAN");
      b.id = "vidprogress";
      b.innerHTML = '<span id="curq" style="font-weight:500"></span><span id="curtime" style="display:inline-block;margin-left:1ex"></span>';
      b.style.cssText = "margin-left:1ex;border:1px solid #ccc;border-radius:4px;padding:2px;background:#eee;text-align:center;font-size:9pt";
      if (window["body-container"]) {
        a.appendChild(b);
      } else a.insertBefore(b, a.querySelector("#flex"));
    } else timerWaitInfo = setTimeout(waitInfo, 200);
  })();
}

function processPlayer() {
  function zerolead(n){
    return n > 9 ? n : "0" + n;
  }

  function sec2hms(sec) {
   var c = sec % 60, d = Math.floor(sec / 60);
   return (d >= 60 ? zerolead(Math.floor(d / 60)) + ":" : "") + zerolead(d % 60) + ":" + zerolead(c);
  }

  function updProgress(a, b, c, d, ls){
    a = window.movie_player;
    if (a && window.vidprogress2b && a.getCurrentTime) try {
      if (window.curtime) {
        b = a.getPlaybackQuality();
        switch (b) {
          case "light":
          case "tiny":    c =  "144p"; break;
          case "small":   c =  "240p"; break;
          case "medium":  c =  "360p"; break;
          case "large":   c =  "480p"; break;
          case "highres": c = "4320p"; break;
          default:
            if (ls = b.match(/^hd(\d+)/)) {
              c = ls[1] + "p";
            } else c = b;
        }
        (d = a.getAvailableQualityLevels()).pop();
        curq.textContent = c + (d.indexOf(b) > 0 ? "+" : "");
        curq.title = `Current: ${b}\nAvailable: ${d}`;
      }
      b = a.getCurrentTime();
      if (b >= 0) {
        ls = a.getDuration();
        if (!a.getVideoData().isLive) {
          if (window.curtime) {
            curtime.textContent = sec2hms(Math.floor(b)) + " / " + sec2hms(Math.floor(ls)) + " (" + Math.floor(b * 100 / ls) + "%)";
          }
          vidprogress2b.style.width = Math.ceil((b / ls) * vidprogress2.offsetWidth) + "px";
          vidprogress2c.style.width = Math.ceil((a.getVideoBytesLoaded() / a.getVideoBytesTotal()) * vidprogress2.offsetWidth) + "px";
        } else {
          if (window.curtime) {
            curtime.textContent = "LIVE";
          }
          vidprogress2b.style.width = "100%";
        }
      } else {
        if (window.curtime) {
          curq.textContent = "";
          curtime.textContent = "";
        }
        vidprogress2b.style.width = "0px";
        vidprogress2c.style.width = "0px";
      }
    }catch(a){
      if (window.curtime) {
        curq.textContent = "[???]";
        curtime.textContent = "???";
      }
      vidprogress2b.style.width = "0px";
      vidprogress2c.style.width = "0px";
    }
  }

  function resumeProgressMonitor() {
    if (timerProgressMonitor) return;
    updProgress();
    timerProgressMonitor = setInterval(updProgress, 200);
  }

  function pauseProgressMonitor() {
    clearInterval(timerProgressMonitor);
    timerProgressMonitor = 0;
    updProgress();
  }

  clearInterval(timerProgressMonitor);
  timerProgressMonitor = 0;
  clearTimeout(timerWaitPlayer);
  timerWaitPlayer = 0;
  clearInterval(timerDoubleCheck);
  timerDoubleCheck = 0;
  (function waitPlayer() {
    if (!window.vidprogress2 && window.movie_player && (a = movie_player.parentNode.querySelector("video"))) {
      b = document.createElement("DIV");
      b.id = "vidprogress2";
      b.style.cssText = "opacity:.66;position:absolute;z-index:10;bottom:0;width:100%;height:" + progressbarHeight + "px;background:" + progressbarColor;
      b.innerHTML = `
<div id="vidprogress2c" style="position:absolute;height:100%;background:${progressbarBufferColor}"></div>
<div id="vidprogress2b" style="position:absolute;height:100%;background:${progressbarElapsedColor}"></div>`;
      movie_player.appendChild(b);
      if (movie_player.getPlayerState() === 1) {
        resumeProgressMonitor();
      }
      //useful: onLoadedMetadata(), onStateChange(state), onPlayVideo(info), onReady(playerApi), onVideoAreaChange(), onVideoDataChange(info)
      //states: -1=notReady, 0=ended, 1=playing, 2=paused, 3=ready, 4=???, 5=notAvailable?
      movie_player.addEventListener("onLoadedMetadata", resumeProgressMonitor);
      movie_player.addEventListener("onStateChange", function(state) {
        if (state === 1) {
          resumeProgressMonitor();
        } else pauseProgressMonitor();
      });
    } else timerWaitPlayer = setTimeout(waitPlayer, 200);
  })();

  function doubleCheck() {
    if (window.movie_player && movie_player.getPlayerState) {
      if (movie_player.getPlayerState() === 1) {
        resumeProgressMonitor();
      } else pauseProgressMonitor();
    }
  }
  if (!timerDoubleCheck) timerDoubleCheck = setInterval(doubleCheck, 500);
}

addEventListener("yt-page-data-updated", processInfo);
addEventListener("yt-player-released", processPlayer);
addEventListener("load", function() {
  processInfo();
  processPlayer();
});
addEventListener("spfprocess", function() {
  setTimeout(function() {
    processInfo();
    processPlayer();
  }, contentLoadProcessDelay);
});
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