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Last active December 18, 2015 08:49
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Simple example of how to get audio data from live microphone input via getUserMedia.
window.onload = function() {
var context = new webkitAudioContext();
var analyser = context.createAnalyser();
var buffer = new Float32Array(analyser.frequencyBinCount);
function analyze() {
// buffer is now filled with data
// if there are -100 values only set your systems microphone & speakers sample rates to the same values
function connectStream(stream) {
// uncomment if you want to playback the recorded audio too
//var audioElement = document.getElementById('audio');
//audioElement.autoplay = true;
//audioElement.src = window.webkitURL.createObjectURL(stream);
var source = context.createMediaStreamSource(stream);
function microphoneError(e) {
alert('MicrophoneError error!', e);
if (navigator.webkitGetUserMedia) {
navigator.webkitGetUserMedia({audio: true, video: false}, connectStream, microphoneError);
} else {
alert('Your browser does not support webkitGetUserMedia.');
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