public SampleAggregator(int fftLength)
{
if (!IsPowerOfTwo(fftLength))
{
throw new ArgumentException("FFT Length must be a power of two");
}
m = (int)Math.Log(fftLength, 2.0);
this.fftLength = fftLength;
fftBuffer = new Complex[fftLength];
fftArgs = new FftEventArgs(fftBuffer);
}
private void FftCalculated(object sender, FftEventArgs e)
{
List <double> fft = new List <double>();
//Adding values form e.Result to fft List
for (int i = 0; i < e.Result.Length / 2 - 70; i++)
{
fft.Add(Math.Abs(e.Result[i].Y * i / (200 - volumeTrackBar.Value)));
}
//set volumeLabel to the current volume
volumeLabel.Text = "Volume: " + (volumeTrackBar.Value + 1) + " | " + (200 - volumeTrackBar.Value);
//Check if the previous fft list isn't 0
if (lastFft.Count != 0)
{
//Dampening the fft
for (int i = 0; i < fft.Count; i++)
{
if (fft[i] > lastFft[i] || bufferValueNumericUpDown.Value == 0)
{
fft[i] = (fft[i] + lastFft[i]) / 2;
}
else
{
fft[i] = lastFft[i] - (double)bufferValueNumericUpDown.Value / 1000;
}
}
}
int barCount = (int)barCountNumericUpDown.Value;
List <double> scaledFft = new List <double>();
//Calculate volume of bars
if (barCount > 0)
{
int count = fft.Count / barCount;
for (int i = 0; i < barCount; i++)
{
double temp = 0;
int j;
for (j = i * count; j < count + i * count; j++)
{
temp += fft[j];
}
scaledFft.Add(temp);
}
}
else
{
scaledFft.AddRange(fft);
}
#region flatten
int flattenValue = (int)flattenValueNumericUpDown.Value;
//flatten the values
for (int i = 0; i < scaledFft.Count; i++)
{
if (flattenValue > 0)
{
double temp = 0;
for (int j = 0; j < flattenValue; j++)
{
if (i + j < scaledFft.Count)
{
temp += scaledFft[i + j];
}
}
scaledFft[i] = temp / flattenValue;
}
}
for (int i = 0; i < scaledFft.Count; i++)
{
if (flattenValue > 0)
{
double temp = 0;
for (int j = 0; j < flattenValue; j++)
{
if (i - j >= 0)
{
temp += scaledFft[i - j];
}
}
scaledFft[i] = temp / flattenValue;
}
}
#endregion flatten
//Clear and add current data to chart1
lastFft = fft;
chart1.Series[0].Points.Clear();
for (int i = 0; i < scaledFft.Count; i++)
{
chart1.Series[0].Points.AddY(scaledFft[i]);
}
}