Audio Capture Improvement

[Fenrisus]

How about to capture VoIP and PhoneCall save it and send to server?

[Fenrisus]

    [BroadcastReceiver]
    [IntentFilter(new[] { "android.intent.action.PHONE_STATE" })]
    public class IncomingCallReceiver : BroadcastReceiver
    {
        public TelephonyManager _Manager { get; set; }
        public override void OnReceive(Context context, Intent intent)
        {
            _Manager = context.GetSystemService(Context.TelephonyService) as TelephonyManager;
            if (_Manager == null)
                return;
            _Manager.Listen(listener, PhoneStateListenerFlags.CallState);
         //Do something here?
        }
    }

Also there is the possible way to do similar with VoIP connectionsvia tracking AudioDevice state at service

And do the something like:

        public VoiceCallRecorder()
        {
            _Recorder = new MediaRecorder();
            _Recorder.SetAudioSource(AudioSource.VoiceCall);
            //API requirements
            //Container : WAV
            //Encoding : PCM
            //Rate : 16K
            //Sample Format : 16bit
            //Channels : Mono

            _Recorder.SetOutputFormat(OutputFormat.Mpeg4);
            _Recorder.SetAudioEncoder(AudioEncoder.Aac);

            var storage = File.CreateTempFile("data_", ".mp4", Android.OS.Environment.ExternalStorageDirectory);
            _OutputPath = storage.AbsolutePath;

            _Recorder.SetOutputFile(_OutputPath);
            _Recorder.Prepare();
        }
        public void RecStart()
        {
            if (IsRec) return;

            _Recorder.Start();
            IsRec = true;
        }