Fourier.h

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#pragma once
#include "HephShared.h"
#include "Complex.h"
#include "Buffers/ComplexBuffer.h"
#include "Buffers/DoubleBuffer.h"
 
namespace Heph
{
    class HEPH_API Fourier final
    {
    private:
        static constexpr bool DIRECTION_FORWARD = true;
        static constexpr bool DIRECTION_BACKWARD = false;
 
    public:
        Fourier() = delete;
        Fourier(const Fourier&) = delete;
        Fourier& operator=(const Fourier&) = delete;
 
    public:
        static ComplexBuffer FFT(const DoubleBuffer& doubleBuffer);
 
        static ComplexBuffer FFT(const DoubleBuffer& doubleBuffer, size_t fftSize);
 
        static void FFT(ComplexBuffer& complexBuffer);
 
        static void FFT(ComplexBuffer& complexBuffer, size_t fftSize);
 
        static void IFFT(DoubleBuffer& doubleBuffer, ComplexBuffer& complexBuffer);
 
        static void IFFT(ComplexBuffer& complexBuffer, bool scale);
 
        static double BinFrequencyToIndex(size_t sampleRate, size_t fftSize, double frequency);
 
        static double IndexToBinFrequency(size_t sampleRate, size_t fftSize, size_t index);
 
        static size_t CalculateFFTSize(size_t bufferSize);
 
        static DoubleBuffer Convolve(const DoubleBuffer& source, const DoubleBuffer& kernel);
 
        static DoubleBuffer Convolve(const DoubleBuffer& source, const DoubleBuffer& kernel, ConvolutionMode convolutionMode);
 
    private:
        static void ReverseBits(ComplexBuffer& complexBuffer, size_t fftSize);
        static void FFT_Internal(ComplexBuffer& complexBuffer, size_t fftSize, bool direction);
    };
}