// ==UserScript==
// @name         雨课堂追帧
// @version      0.1.4
// @description  雨课堂直播追帧：保持延迟在 3s 内
// @author       panda2134
// @match        *://*.yuketang.cn/*
// @run-at       document-idle
// @grant        none
// @namespace https://greasyfork.org/users/379925
// ==/UserScript==
(function() {
'use strict';
var player, intv;
function checkLatency() {
var latency = player.buffered.end(0) - player.currentTime;
var MAX_LATENCY = 3.00;
document.getElementById('latency').innerText = '延迟：' + latency.toFixed(2);
if (latency > MAX_LATENCY) {
console.log('追帧');
player.playbackRate = 1.1;
player.ontimeupdate = function() {
if(player.buffered.end(0) - player.currentTime < 1) {
player.playbackRate = 1.00;
}
};
}
}
setTimeout(function() {
player = document.getElementById('player');
if(!player) return;
if (!(document.getElementById('latency'))) {
var div = document.createElement('div'), controls = document.getElementsByClassName('video__controls')[0],
cr = document.getElementsByClassName('controls__right')[0];
div.style = 'font-size: 14px;';
div.id = 'latency';
controls.insertBefore(div, cr)
}
player.onplaying = function() {
intv = setInterval(checkLatency, 500);
};
player.onwaiting = function() { clearInterval(intv) };
player.onpaused = function() { clearInterval(intv) };
}, 1000)
})();