SpectralAnalysis.h

#ifndef __SPECTRALANALYSIS__
#define __SPECTRALANALYSIS__
 
#include <fftsg.h>
 
namespace BEEPING {
enum Mode { kMagnitudeSpectrum = 0, kEnergySpectrum = 1 };
 
class SpectralAnalysis {
 private:
  SpectralAnalysis(const SpectralAnalysis&);
  void operator=(const SpectralAnalysis&);
 
  Mode mode;
 
  CFFTOoura* fftooura;
 
  float* inputBuffer;
 
 public:
  SpectralAnalysis(Mode _mode, int _fftSize, int _windowSize, int _hopSize);
  ~SpectralAnalysis();
 
  int mFftSize;
  int mWindowSize;
  int mHopSize;
  int mSpecSize;
  float* mSpecMag;
  float* mSpecPhase;
  float* mWindow;
 
  void doFFT(float* inputBuffer, float* magSpectrum, float* imagSpectrum);
 
  inline int multiplyBuffers(float* tgtPtr, const float* srcPtrA,
                             const float* srcPtrB, int n);
  inline void clearBuffer(float* tgtPtr, int n);
  inline int copyToBuffer(float* tgtPtr, const float* srcPtr, int n);
 
  inline void generateBlackmanHarris92Window(float* window, int size);
  inline void generateBlackmanHarris74Window(float* window, int size);
  inline void generateBlackmanHarrisWindow(float* window, int size);
};
 
}  // namespace BEEPING
 
#endif  // __SPECTRALANALYSIS__