TrackSpectrumTransformer.h

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/*!********************************************************************
 
Audacity: A Digital Audio Editor
 
TrackSpectrumTransformer.h
 
Paul Licameli
 
**********************************************************************/
#pragma once
 
#include "SpectrumTransformer.h"
 
class WaveChannel;
class WaveTrack;
 
class WAVE_TRACK_FFT_API TrackSpectrumTransformer /* not final */ :
    public SpectrumTransformer
{
public:
   TrackSpectrumTransformer(
      WaveChannel* pOutputTrack, bool needsOutput,
      eWindowFunctions inWindowType, eWindowFunctions outWindowType,
      size_t windowSize, unsigned stepsPerWindow, bool leadingPadding,
      bool trailingPadding)
       : SpectrumTransformer { needsOutput,    inWindowType,   outWindowType,
                               windowSize,     stepsPerWindow, leadingPadding,
                               trailingPadding }
       , mOutputTrack { pOutputTrack }
   {
      assert(!needsOutput || pOutputTrack != nullptr);
   }
   ~TrackSpectrumTransformer() override;
 
   bool Process(
      const WindowProcessor& processor, const WaveChannel& channel,
      size_t queueLength, sampleCount start, sampleCount len);
 
   static bool PostProcess(WaveTrack& outputTrack, sampleCount len);
 
protected:
   bool DoStart() override;
   void DoOutput(const float* outBuffer, size_t mStepSize) override;
   bool DoFinish() override;
 
private:
   WaveChannel* const mOutputTrack;
};