private void SetDataFFT(WaveInEventArgs args)
{
int bytesPerSample = _wi.WaveFormat.BitsPerSample / 8;
int samplesRecorded = args.BytesRecorded / bytesPerSample;
Int16[] dataPcm = new Int16[samplesRecorded];
for (int i = 0; i < samplesRecorded; i++)
{
dataPcm[i] = BitConverter.ToInt16(args.Buffer, i * bytesPerSample);
}
// the PCM size to be analyzed with FFT must be a power of 2
int fftPoints = 2;
while (fftPoints * 2 <= dataPcm.Length)
{
fftPoints *= 2;
}
// apply a Hamming window function as we load the FFT array then calculate the FFT
NAudio.Dsp.Complex[] fftFull = new NAudio.Dsp.Complex[fftPoints];
for (int i = 0; i < fftPoints; i++)
{
fftFull[i].X = (float)(dataPcm[i] * NAudio.Dsp.FastFourierTransform.HammingWindow(i, fftPoints));
}
NAudio.Dsp.FastFourierTransform.FFT(true, (int)Math.Log(fftPoints, 2.0), fftFull);
double[] dataFft = new double[fftPoints / 2];
byte[] data = new byte[fftPoints / 2];
for (int i = 0; i < fftPoints / 2; i++)
{
double fftLeft = Math.Abs(fftFull[i].X + fftFull[i].Y);
double fftRight = Math.Abs(fftFull[fftPoints - i - 1].X + fftFull[fftPoints - i - 1].Y);
dataFft[i] = fftLeft + fftRight;
data[i] = (byte)(fftLeft + fftRight);
}
/*if(SpectrumVisualizer.GetType().Name == "CircleSpectrumVisualizer")
* SpectrumVisualizer.Set(GetNiceCircleFFT(data));
* else
* SpectrumVisualizer.Set(data);*/
SpectrumVisualizer.Set(GetNiceFftData(data, SpectrumVisualizer.GetType().Name == "CircleSpectrumVisualizer"));
}
private void SetDataAmplitude(WaveInEventArgs args)
{
int bytesPerSample = _wi.WaveFormat.BitsPerSample / 8;
int samplesRecorded = args.BytesRecorded / bytesPerSample;
Int16[] lastBuffer = new Int16[samplesRecorded];
for (int i = 0; i < samplesRecorded; i++)
{
lastBuffer[i] = BitConverter.ToInt16(args.Buffer, i * bytesPerSample);
}
int lastBufferAmplitude = lastBuffer.Max() - lastBuffer.Min();
double amplitude = (double)lastBufferAmplitude / Math.Pow(2, _wi.WaveFormat.BitsPerSample);
if (amplitude > peakAmplitudeSeen)
{
peakAmplitudeSeen = amplitude;
}
amplitude = amplitude / peakAmplitudeSeen * 100;
//_spectrumdata.Clear();
if (_spectrumdata.Count >= NumberOfLines)
{
_spectrumdata.RemoveAt(0);
}
double regleDe3 = amplitude * 255 / 100;
int y = Convert.ToInt32(regleDe3);
if (y > 255)
{
y = 255;
}
if (y < 0)
{
y = 0;
}
_spectrumdata.Add((byte)y);
SpectrumVisualizer.Set(_spectrumdata.ToArray());
}
