sample code of mic level + webspeech. the code kind of works, but asks twice for mic authorization.

webspeech_miclevel.js

var that = this;
var recognition = new webkitSpeechRecognition();

recognition.continuous = true;
recognition.interimResults = true;

recognition.onstart = function() 
{
  var context = new webkitAudioContext();  
	navigator.webkitGetUserMedia(
		{
			audio: true
		}, 
		function(stream) 
		{
			var liveSource = context.createMediaStreamSource(stream);
			var levelChecker = context.createJavaScriptNode(1024, 1 ,1);

			liveSource.connect(levelChecker);
			levelChecker.connect(context.destination);
			levelChecker.onaudioprocess = that.processAudio;
		}
	);
	that.isRunning(true);
};

hi @vndevil sorry but this code is not maintained anymore.