(function(navigator, MediaStreamRecorder, document) {
    'use strict';
    var mediaConstraints = {
        audio: true
    };

    navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

    function onMediaSuccess(stream) {
        var mediaRecorder = new MediaStreamRecorder(stream);
        mediaRecorder.mimeType = 'audio/wav'; // audio/webm or audio/ogg or audio/wav
        mediaRecorder.sampleRate = 22050;
        mediaRecorder.ondataavailable = function(blob) {
            // POST/PUT "Blob" using FormData/XHR2
            console.log(blob);
            var blobURL = URL.createObjectURL(blob);
            document.write('' + blobURL + '');
        };
        mediaRecorder.start(3000);
    }

    function onMediaError(e) {
        console.error('media error', e);
    }
})(navigator, MediaStreamRecorder, document);