private void initRecorder()
{
Encoding encoding = Encoding.Pcm16bit;
shortsBuffer = new short[bufferSize];
buffer = new byte[bufferSize];
audioRecorder = new AudioRecord(
// Hardware source of recording.
AudioSource.VoiceCommunication,
// Frequency
sampleRate,
// Mono or stereo
ChannelIn.Mono,
// Audio encoding
encoding,
// Length of the audio clip.
bufferSize * 5
);
audioRecorder.StartRecording();
if (AcousticEchoCanceler.IsAvailable)
{
echoCanceller = AcousticEchoCanceler.Create(audioRecorder.AudioSessionId);
}
if (NoiseSuppressor.IsAvailable)
{
noiseSuppressor = NoiseSuppressor.Create(audioRecorder.AudioSessionId);
}
}
public void stop()
{
if (!running)
{
return;
}
running = false;
if (echoCanceller != null)
{
try
{
echoCanceller.Release();
echoCanceller.Dispose();
}
catch (Exception)
{
}
echoCanceller = null;
}
if (noiseSuppressor != null)
{
try
{
noiseSuppressor.Release();
noiseSuppressor.Dispose();
}
catch (Exception)
{
}
noiseSuppressor = null;
}
if (audioRecorder != null)
{
try
{
audioRecorder.Stop();
audioRecorder.Release();
}
catch (Exception)
{
}
audioRecorder.Dispose();
audioRecorder = null;
}
if (audioEncoder != null)
{
audioEncoder.stop();
audioEncoder.Dispose();
audioEncoder = null;
}
buffer = null;
shortsBuffer = null;
bufferSize = 0;
lock (outputBuffers)
{
outputBuffers.Clear();
}
AudioManager am = (AudioManager)MainActivity.Instance.GetSystemService(Context.AudioService);
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
{
if (focusListener != null)
{
#pragma warning disable CS0618 // Type or member is obsolete
am.AbandonAudioFocus(focusListener);
#pragma warning restore CS0618 // Type or member is obsolete
focusListener.Dispose();
focusListener = null;
}
}
else
{
if (focusListener != null)
{
if (focusRequest != null)
{
am.AbandonAudioFocusRequest(focusRequest);
focusRequest.Dispose();
focusRequest = null;
}
focusListener.Dispose();
focusListener = null;
}
}
}
