FourierTransform_pffft.h

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// FFT wrapper for the PFFFT library. It is possible to use different wrappers for
// other FFT libraries or platforms, as long as the CSS complex data format is used.
 
#pragma once
 
#include <stdint.h>
 
#include "SamplesFloat.h"
 
struct PFFFT_Setup;
 
namespace staffpad::audio {
 
class FourierTransform
{
public:
  FourierTransform(int32_t newBlockSize);
  ~FourierTransform();
 
  int getSize() const { return static_cast<int>(_blockSize); }
 
  void forwardReal(const SamplesReal& t, SamplesComplex& c);
  void inverseReal(const SamplesComplex& c, SamplesReal& t);
 
private:
  PFFFT_Setup* realFftSpec = nullptr;
  PFFFT_Setup* complexFftSpec = nullptr;
  float* _pffft_scratch = nullptr;
 
  const int32_t _blockSize;
  int32_t _order = 0;
};
 
} // namespace staffpad::audio