public override float[] FFTForward(float[] signal, int startIndex, int length)
{
IntPtr input = GetInput(length);
IntPtr output = GetOutput(length);
IntPtr fftPlan = GetFFTPlan(length, input, output);
float[] applyTo = new float[length];
Array.Copy(signal, startIndex, applyTo, 0, length);
Marshal.Copy(applyTo, 0, input, length);
FFTWNativeMethods.execute(fftPlan);
float[] result = new float[length * 2];
Marshal.Copy(output, result, 0, length);
FreeUnmanagedMemory(input);
FreeUnmanagedMemory(output);
FreePlan(fftPlan);
return(result);
}
public override void Execute(IntPtr fftPlan)
{
FFTWNativeMethods.execute(fftPlan);
}
public override void FreeUnmanagedMemory(IntPtr memoryBlock)
{
FFTWNativeMethods.free(memoryBlock);
}
public override void FreePlan(IntPtr fftPlan)
{
FFTWNativeMethods.destroy_plan(fftPlan);
}
public override IntPtr GetInput(int length)
{
return(FFTWNativeMethods.malloc(4 * length));
}
