multi-audios-recording.html

<style>
    html, body, video, canvas {
        margin: 0!important;
        padding: 0!important;
    }
    audio { vertical-align: middle; }
</style>

<title>Multiple Audios Recording using RecordRTC</title>
<h1>Multiple Audios Recording using RecordRTC</h1>

<br>
<button id="btn-enable-microphone">Enable Microphone</button>
<button id="btn-start-recording" disabled>Start Recording</button>
<button id="btn-stop-recording" disabled>Stop Recording</button>

<hr>
(First Microphone) <audio id="audio-1" controls autoplay playsinline></audio>
<hr>
(Second Microphone) <audio id="audio-2" controls autoplay playsinline></audio>

<script src="/RecordRTC.js"></script>
<script>
var audio1 = document.querySelector('#audio-1');
var audio2 = document.querySelector('#audio-2');

function captureMicrophone(callback) {
    navigator.mediaDevices.getUserMedia({ audio: true }).then(function(microphone) {
        callback(microphone);
    }).catch(function(error) {
        alert('Unable to capture your microphone. Please check console logs.');
        console.error(error);
    });
}

function stopRecordingCallback() {
    audio1.srcObject = null;
    audio2.srcObject = null;

    var blob1 = recorder1.getBlob();
    audio1.src = URL.createObjectURL(blob1);

    var blob2 = recorder2.getBlob();
    audio2.src = URL.createObjectURL(blob2);

    document.getElementById('btn-start-recording').disabled = false;
}

var recorder1, recorder2; // globally accessible

document.getElementById('btn-enable-microphone').onclick = function() {
    this.disabled = true;

    captureMicrophone(function(microphone) {
        recorder1 = RecordRTC(microphone, {
            type: 'audio'
        });

        recorder2 = RecordRTC(microphone, {
            type: 'audio'
        });

        recorder1.microphone = microphone;
        recorder2.microphone = microphone;

        document.getElementById('btn-start-recording').disabled = false;

        audio1.srcObject = recorder1.microphone;
    });
};

document.getElementById('btn-start-recording').onclick = function() {
    this.disabled = true;

    audio1.srcObject = recorder1.microphone;
    audio2.srcObject = recorder2.microphone;

    recorder1.startRecording();
    recorder2.startRecording();

    document.getElementById('btn-stop-recording').disabled = false;
};

document.getElementById('btn-stop-recording').onclick = function() {
    this.disabled = true;
    recorder1.stopRecording(function() {
        recorder2.stopRecording(function() {
            stopRecordingCallback();
        });
    });
};
</script>

<footer style="margin-top: 20px;"><small id="send-message"></small></footer>
<script src="https://www.webrtc-experiment.com/common.js"></script>