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tomascastana / Detector de silencio

// ==UserScript==
// @name         Detector de silencio
// @namespace    http://taringa.net/Incasoft
// @version      0.1
// @description  enter something useful
// @author       You
// @match           http://www.youtube.com/*
// @match           https://www.youtube.com/*
// @match           http://youtube.com/*
// @match           https://youtube.com/*
// @include         http://www.youtube.com/*
// @include         https://www.youtube.com/*
// @include         http://youtube.com/*
// @include         https://youtube.com/*
// @grant        none
// ==/UserScript==

var silence = 0;
var seconds = 3;

if (!Date.now) {
    Date.now = function() { return new Date().getTime(); };
}
var silenceSince = false;
var videoPlaying=false;
var processor;
var videoElement;

window.addEventListener('load',function(){
console.log('Init Youtube silence detector');

window.onYouTubePlayerReady = onYouTubePlayerReady = function(ytplayerobj){
	videoPlaying=true;
	ytplayerobj.addEventListener('onStateChange', function(e){
	        videoPlaying= 1===e;
	}, false);
};

var context = new webkitAudioContext();
videoElement = document.querySelector('video');
var mediaSourceNode = context.createMediaElementSource(videoElement);
processor = context.createScriptProcessor();
mediaSourceNode.connect(processor);
mediaSourceNode.connect(context.destination);
processor.connect(context.destination);
window.ii=window.i=0;
processor.onaudioprocess=function(e){
	if(videoPlaying&&videoElement.volume>0&&false===videoElement.muted){
		left=e.inputBuffer.getChannelData(0);
		for(var i in left){
			if((left[i]/videoElement.volume) > silence){
				silenceSince = false;
				return true;
			}
		}
		right=e.inputBuffer.getChannelData(1);
		for(i in right){
			if((right[i]/videoElement.volume) > silence){
				silenceSince = false;
				return true;
			}
		}
                console.log('silence');
		if(false!==silenceSince){
			if((silenceSince+seconds*1000)<=Date.now()){
                console.log('siguiente');
				document.querySelector('.ytp-button-pause').click();
				videoPlaying=false;
				silenceSince=false;
				document.querySelector('.ytp-button-next').click();
			}
		}else{
			silenceSince=Date.now();
		}
		return true;
	}
}
});