void sampleAggregator_FftCalculated(object sender, FftEventArgs e)
{
if (!tabLoaded)
{
return;
}
var mas = e.Result.Select(x => x.X * x.X + x.Y * x.Y).ToArray();
if (prevFFT == null)
{
prevFFT = new float[e.Result.Length / 2];
Array.Copy(mas, prevFFT, mas.Length / 2);
}
for (int i = 0; i < mas.Length / 2; i++)
{
mas[i] = Math.Max(mas[i] - prevFFT[i], 0);
}
int maxind = 0;
for (int i = 0; i < mas.Length / 2; i++)
{
if (mas[maxind] < mas[i])
{
maxind = i;
}
}
double[] noteBins = new double[Notes.Count];
if (mas[maxind] > 0.0001)
{
for (int i = 0; i < mas.Length / 2; i++) //нормализуем
{
mas[i] /= mas[maxind];
}
noteBins = new double[Notes.Count];
for (int i = 0; i < mas.Length / 2; i++)
{
double frequency = (double)(i * this.sampleRate) / fftlength;
int x = FindClosestIndex(frequency);
noteBins[x] += mas[i];
}
var maxBinValue = noteBins.Max();
noteBins = noteBins.Select(a => a / maxBinValue).ToArray();
}
/*using (Graphics g = pictureBox1.CreateGraphics())
* {
* g.Clear(Color.White);
* for (int i = 0; i<noteBins.Length; i++)
* {
* g.DrawLine(p, new Point(i*10, 0), new Point(i*10, (int)(noteBins[i] * 200)));
* }
* }*/
tablatureProcessor.Compare(noteBins);
}
public SampleAggregator(int fftLength, int timeScaleFactor = 1)
{
if (!IsPowerOfTwo(fftLength))
{
throw new ArgumentException("FFT Length must be a power of two");
}
this.timeScaleFactor = timeScaleFactor;
this.m = (int)Math.Log(fftLength, 2.0);
this.fftLength = fftLength;
this.fftBuffer = new Complex[fftLength];
this.fftBufferPrev = new Complex[fftLength];
this.fftBufferDoubled = new Complex[fftLength * 2];
this.fftArgs = new FftEventArgs(fftBuffer);
}