SpectrumAnalyst.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  SpectrumAnalyst.h
 
  Dominic Mazzoni
  Paul Licameli split from FreqWindow.h
 
**********************************************************************/
 
#pragma once
 
#include <vector>
#include <functional>
 
class FFT_API SpectrumAnalyst
{
public:
 
   enum Algorithm {
      Spectrum,
      Autocorrelation,
      CubeRootAutocorrelation,
      EnhancedAutocorrelation,
      Cepstrum,
 
      NumAlgorithms
   };
 
   using ProgressFn = std::function<void(long long num, long long den)>;
 
   SpectrumAnalyst();
   ~SpectrumAnalyst();
 
   // Return true iff successful
   bool Calculate(Algorithm alg,
      int windowFunc, // see FFT.h for values
      size_t windowSize, double rate,
      const float *data, size_t dataLen,
      float *pYMin = NULL, float *pYMax = NULL, // outputs
      ProgressFn progress = NULL);
 
   const float *GetProcessed() const;
   int GetProcessedSize() const;
 
   float GetProcessedValue(float freq0, float freq1) const;
   float FindPeak(float xPos, float *pY) const;
 
private:
   float CubicInterpolate(float y0, float y1, float y2, float y3, float x) const;
   float CubicMaximize(float y0, float y1, float y2, float y3, float * max) const;
 
private:
   Algorithm mAlg;
   double mRate;
   size_t mWindowSize;
   std::vector<float> mProcessed;
};