public unsafe void MakeCoefficients(double sampleRate, int frequency, int width, WindowType window, bool stopBand = true)
{
int order = this._order;
if (sampleRate < 30000.0 || width > 600)
{
order = 400;
}
if (sampleRate < 3000.0 || width > 6000)
{
order = 200;
}
this._width = width;
this._frequency = frequency;
int num = this._frequency - this._width / 2;
int num2 = this._frequency + this._width / 2;
int num3 = (int)Math.Max((double)(-this._fftLen / 2), (double)(num * this._fftLen) / sampleRate);
int num4 = (int)Math.Min((double)(this._fftLen / 2), (double)(num2 * this._fftLen) / sampleRate);
num3 = -num3;
if (num3 < 0)
{
num3 += this._fftLen;
}
num4 = -num4;
if (num4 < 0)
{
num4 += this._fftLen;
}
Complex[] fftBuf = this._fftBuf;
fixed (Complex* buffer = fftBuf)
{
int num5 = (!stopBand) ? 1 : 0;
int num6 = stopBand ? 1 : 0;
for (int i = 0; i < this._fftLen; this._fftBuf[i].Imag = 0f, i++)
{
if (num3 < this._fftLen / 2 && num4 >= this._fftLen / 2)
{
this._fftBuf[i].Real = (float)((i < num3 || i > num4) ? num5 : num6);
continue;
}
ref Complex val = ref this._fftBuf[i];
if (num3 <= num4 && i >= num3 && i <= num4)
{
goto IL_0171;
}
if (num4 < num3 && i >= num4 && i < num3)
{
goto IL_0171;
}
int num7 = num6;
goto IL_0173;
IL_0171:
num7 = num5;
goto IL_0173;
IL_0173:
val.Real = (float)num7;
}
Fourier.BackwardTransform(buffer, this._fftLen);
}
public unsafe void Process(Complex *buffer, int length)
{
int i = 0;
int j = 0;
for (; i < length; i++)
{
this._fftBufferPtr[this._fftBufferPos++] = buffer[i];
if (this._fftBufferPos == this._fftSize)
{
int num = this._halfSize;
int num2 = 0;
while (num < this._fftSize)
{
this._overlapBufferPtr[num2] = this._fftBufferPtr[num];
num++;
num2++;
}
for (; j < length; j++)
{
if (this._sampleBufferHead == this._sampleBufferTail)
{
break;
}
buffer[j] = this._sampleBufferPtr[this._sampleBufferTail];
this._sampleBufferTail = (this._sampleBufferTail + 1 & this._fftSize - 1);
}
Fourier.ForwardTransform(this._fftBufferPtr, this._fftSize, false);
this.ProcessFft(this._fftBufferPtr, this._fftSize);
Fourier.BackwardTransform(this._fftBufferPtr, this._fftSize);
int num3 = 0;
int num4 = this._halfSize - this._overlapSize;
while (num3 < this._halfSize)
{
if (num3 < this._overlapSize)
{
float num5 = (float)num3 * this._blendFactor;
Complex.Mul(ref this._sampleBufferPtr[this._sampleBufferHead], this._fftBufferPtr[num4], num5);
Complex.Mul(ref this._tmp, this._outOverlapPtr[num3], 1f - num5);
Complex.Add(ref this._sampleBufferPtr[this._sampleBufferHead], this._tmp);
}
else
{
this._sampleBufferPtr[this._sampleBufferHead] = this._fftBufferPtr[num4];
}
this._sampleBufferHead = (this._sampleBufferHead + 1 & this._fftSize - 1);
num3++;
num4++;
}
int num6 = 0;
int num7 = this._fftSize - this._overlapSize;
while (num6 < this._overlapSize)
{
this._outOverlapPtr[num6] = this._fftBufferPtr[num7];
num6++;
num7++;
}
for (int k = 0; k < this._halfSize; k++)
{
this._fftBufferPtr[k] = this._overlapBufferPtr[k];
}
this._fftBufferPos = this._halfSize;
}
}
for (; j < length; j++)
{
if (this._sampleBufferHead == this._sampleBufferTail)
{
break;
}
buffer[j] = this._sampleBufferPtr[this._sampleBufferTail];
this._sampleBufferTail = (this._sampleBufferTail + 1 & this._fftSize - 1);
}
}