NAudio Asio - Buffer contains a lot of NaN values

[dansted]

Do any of you know why I'm getting NaN values from the input buffer using NAudio Asio ?

var asioOut = new AsioOut("Audient USB Audio ASIO Driver");
var recordChannelCount = 1;
var sampleRate = 44100;

var waveformat = new WaveFormat(sampleRate, 24, 2);
var playbackProvider = new BufferedWaveProvider(waveformat);

asioOut.InitRecordAndPlayback(playbackProvider, recordChannelCount, sampleRate);
asioOut.Play();
asioOut.AudioAvailable += OnAsioOutAudioAvailable;

private void OnAsioOutAudioAvailable(object sender, AsioAudioAvailableEventArgs e)
{
	e.WrittenToOutputBuffers = true;
	var inputBuffers = e.InputBuffers;
	var outputBuffers = e.OutputBuffers;

	for (int channel = 0; channel < inputBuffers.Length; channel++)
	{
	        IntPtr inputBufferPtr = inputBuffers[channel];
		IntPtr outputBufferPtr = outputBuffers[channel];
			
		int bufferSizeSamples = e.SamplesPerBuffer;
		float[] inputBuffer = new float[bufferSizeSamples];
			
		Marshal.Copy(inputBufferPtr, inputBuffer, 0, bufferSizeSamples);
		Marshal.Copy(inputBuffer, 0, outputBufferPtr, bufferSizeSamples);
	}
}

[markheath]

Take a look at how GetAsInterleavedSamples is implemented and that may help you understand what is going on. ASIO typically does not directly capture floating point audio, so some sample conversion would be required.

[dansted]

Thank you very much, I will take a look at it