public LineSpectrum GetLineSpectrum(int barCount, ScalingStrategy scalingStrategy)
{
if (_spectrumProvider == null || barCount <= 0)
{
return(null);
}
if (_lineSpectrum == null)
{
_lineSpectrum = new LineSpectrum(FftSize)
{
SpectrumProvider = _spectrumProvider,
UseAverage = true,
BarCount = barCount,
IsXLogScale = true,
ScalingStrategy = scalingStrategy
}
}
;
return(_lineSpectrum);
}
private void Start()
{
if (_starting)
{
return;
}
Logger.Debug("Starting audio capture for device: {0}", Device?.FriendlyName ?? "default");
_starting = true;
try
{
Stop();
if (Type == MmDeviceType.Input)
{
_soundIn = Device != null
? new WasapiCapture {
Device = Device
}
: new WasapiCapture();
}
else
{
_soundIn = Device != null
? new WasapiLoopbackCapture {
Device = Device
}
: new WasapiLoopbackCapture();
}
_soundIn.Initialize();
var soundInSource = new SoundInSource(_soundIn);
_source = soundInSource.ToSampleSource().AppendSource(x => new GainSource(x), out _volume);
// create a spectrum provider which provides fft data based on some input
_spectrumProvider = new BasicSpectrumProvider(_source.WaveFormat.Channels, _source.WaveFormat.SampleRate,
FftSize);
// the SingleBlockNotificationStream is used to intercept the played samples
var notificationSource = new SingleBlockNotificationStream(_source);
// pass the intercepted samples as input data to the spectrumprovider (which will calculate a fft based on them)
notificationSource.SingleBlockRead += (s, a) => _spectrumProvider.Add(a.Left, a.Right);
var waveSource = notificationSource.ToWaveSource(16);
// We need to read from our source otherwise SingleBlockRead is never called and our spectrum provider is not populated
var buffer = new byte[waveSource.WaveFormat.BytesPerSecond / 2];
soundInSource.DataAvailable += (s, aEvent) =>
{
while (waveSource.Read(buffer, 0, buffer.Length) > 0)
{
}
};
_lineSpectrum = null;
_singleSpectrum = new SingleSpectrum(FftSize, _spectrumProvider);
_mayStop = false;
_disableTimer.Start();
_volumeTimer.Start();
_soundIn.Start();
Running = true;
}
catch (Exception e)
{
Logger.Warn(e, "Failed to start WASAPI audio capture");
}
_starting = false;
}
