public SampleAggregator(int fftLength)
{
if (!this.IsPowerOfTwo(fftLength))
{
throw new ArgumentException("FFT Length must be a power of two");
}
this.m = (int)Math.Log(fftLength, 2.0);
this.fftLength = fftLength;
this.fftBuffer = new Complex[fftLength];
this.fftArgs = new FftEventArgs(this.fftBuffer);
}
private static float[] calculateFrequencies(FftEventArgs e, bool useLog)
{
var fftPoints = e.Result.Length;
var freqsPoints = fftPoints / 2;
var freqs = new float[freqsPoints];
for (int i = 0; i < freqsPoints; i++)
{
var fftLeft = Math.Abs(e.Result[i].X + e.Result[i].Y);
var fftRight = Math.Abs(e.Result[fftPoints - 1 - i].X + e.Result[fftPoints - 1].Y);
freqs[i] = fftLeft + fftRight;
}
return(freqs);
}
private void fftCalculated(object sender, FftEventArgs e)
{
bool useLog = false;
float[] freqs = calculateFrequencies(e, useLog);
float[] averages = this.calculateLogAverages(freqs);
float[] bands = this.calculateBands(freqs);
const float smoothness = 0.5f;
if (this.lineBuffer == null)
{
this.lineBuffer = new SmoothBuffer(averages.Length, smoothness, true);
}
if (this.bandBuffer == null)
{
this.bandBuffer = new SmoothBuffer(bands.Length, smoothness, true);
}
var bufferedAverage = this.lineBuffer.ApplyBuffer(averages);
var bufferedBands = this.bandBuffer.ApplyBuffer(bands);
this.audioLeds.Show(bands);
var showGraphics = false;
if (showGraphics)
{
float scale = this.getScale(averages);
this.GFX.Clear(Color.FromArgb(20, Color.Black));
this.drawBands(bufferedBands, scale);
this.draw(bufferedAverage, DrawMode.Line, scale);
this.finishDraw();
}
}
