Hochwertiger HTML5 und Javascript Code von dem Designbüro Standardabweichung aus München

var audioContext = null; var audioSource = null; var audioAnalyser = null; var audioGain = null; var audioData = null; var volume = null; var audioStart = function (){ navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia; navigator.getUserMedia({ audio : true, video : false }, audioSuccess, audioError); }; var audioSuccess = function(stream) { window.AudioContext = window.AudioContext || window.webkitAudioContext; var fftSize = 256; audioContext = new AudioContext(); audioSource = audioContext.createMediaStreamSource(stream); audioGain = audioContext.createGain(); audioGain.gain.value = 1.0; //Lautstärke audioGain.connect(audioContext.destination); audioAnalyser = audioContext.createAnalyser(); audioAnalyser.fftSize = fftSize; audioAnalyser.connect(audioGain); audioData = new Uint8Array(fftSize * 0.5); audioSource.connect(audioGain); audioSource.connect(audioAnalyser); var sampleAudioStream = function() { audioAnalyser.getByteFrequencyData(audioData); for (var i = 0, length = audioData.length, sum = 0; i < length; i++) { sum += audioData[i]; } volume = sum / (length * 256); }; setInterval(sampleAudioStream, 20); volume = 0; }; var audioError = function(event) { };