1var constraints = { audio: true };
2navigator.mediaDevices.getUserMedia(constraints).then(function(mediaStream) {
3    var mediaRecorder = new MediaRecorder(mediaStream);
4    mediaRecorder.onstart = function(e) {
5        this.chunks = [];
6    };
7    mediaRecorder.ondataavailable = function(e) {
8        this.chunks.push(e.data);
9    };
10    mediaRecorder.onstop = function(e) {
11        var blob = new Blob(this.chunks, { 'type' : 'audio/ogg; codecs=opus' });
12        socket.emit('radio', blob);
13    };
14
15    // Start recording
16    mediaRecorder.start();
17
18    // Stop recording after 5 seconds and broadcast it to server
19    setTimeout(function() {
20        mediaRecorder.stop()
21    }, 5000);
22});
23
24// When the client receives a voice message it will play the sound
25socket.on('voice', function(arrayBuffer) {
26    var blob = new Blob([arrayBuffer], { 'type' : 'audio/ogg; codecs=opus' });
27    var audio = document.createElement('audio');
28    audio.src = window.URL.createObjectURL(blob);
29    audio.play();
30});