@vikasietum_tecknology/record-rtc/simple-demos/ondataavailable-StereoAudioRecorder.html

record-rtc is a library based on recordrtc library. In this forked version of the original library we have optimized the memory management. The video recording is stored in IndexDB in chunks.

<style>
    html, body {
        margin: 0!important;
        padding: 0!important;
    }
</style>

<title>ondataavailable | StereoAudioRecorder | RecordRTC</title>
<h1>ondataavailable | StereoAudioRecorder | using RecordRTC</h1>

Interval: <input id="interval" type="text" value="3000"> milliseconds
<hr>
<button id="btn-start-recording">Start Recording</button>
<button id="btn-stop-recording" disabled>Stop Recording</button>

<hr>
<audio controls autoplay playsinline></audio>

<div id="audio-blobs-container" style="margin-top: 20px;">
    <h2 style="margin-bottom: 20px;">Audio Blobs Goes Here:</h2>
</div>

<script src="/RecordRTC.js"></script>

<script>
var audio = document.querySelector('audio');
var audioBlobsContainer = document.querySelector('#audio-blobs-container');

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() {
    audio.src = audio.srcObject = null;
    recorder.microphone.stop();
    recorder = null;
}

var recorder; // globally accessible

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

        recorder = RecordRTC(microphone, {
            recorderType: StereoAudioRecorder,
            mimeType: 'audio/wav',
            timeSlice: parseInt(document.querySelector('#interval').value), // pass this parameter
            ondataavailable: function(blob) {
                var audio = document.createElement('audio');
                audio.controls = true;
                audio.srcObject = null;
                audio.src = URL.createObjectURL(blob);
                audioBlobsContainer.appendChild(audio);
                audioBlobsContainer.appendChild(document.createElement('hr'));
            }
        });

        recorder.startRecording();

        // release microphone on stopRecording
        recorder.microphone = microphone;

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

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

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