SoundTouchEffect.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  SoundTouchEffect.h
 
  Dominic Mazzoni, Vaughan Johnson
 
  This abstract class contains all of the common code for an
  effect that uses SoundTouch to do its processing (ChangeTempo
  and ChangePitch).
 
**********************************************************************/
 
 
 
#if USE_SOUNDTOUCH
 
#ifndef __AUDACITY_EFFECT_SOUNDTOUCH__
#define __AUDACITY_EFFECT_SOUNDTOUCH__
 
#include "StatefulEffect.h"
 
// forward declaration of a class defined in SoundTouch.h
// which is not included here
namespace soundtouch { class SoundTouch; }
 
 
class TimeWarper;
class LabelTrack;
class NoteTrack;
class WaveChannel;
class WaveTrack;
 
class EffectSoundTouch /* not final */ : public StatefulEffect
{
public:
   
   // EffectSoundTouch implementation
 
#ifdef USE_MIDI
   double mSemitones; // pitch change for NoteTracks
   EffectSoundTouch();
#endif
   ~EffectSoundTouch() override;
 
protected:
   // Effect implementation
 
   using InitFunction = std::function< void(soundtouch::SoundTouch *soundtouch) >;
   bool ProcessWithTimeWarper(InitFunction initer,
                              const TimeWarper &warper,
                              bool preserveLength);
 
private:
   bool ProcessLabelTrack(LabelTrack *track, const TimeWarper &warper);
#ifdef USE_MIDI
   bool ProcessNoteTrack(NoteTrack *track, const TimeWarper &warper);
#endif
   bool ProcessOne(soundtouch::SoundTouch *pSoundTouch,
      WaveChannel &orig, WaveTrack &out, sampleCount start, sampleCount end,
      const TimeWarper &warper);
   bool ProcessStereo(soundtouch::SoundTouch *pSoundTouch,
      WaveTrack &orig, WaveTrack &out,
      sampleCount start, sampleCount end,
      const TimeWarper &warper);
   bool ProcessStereoResults(soundtouch::SoundTouch *pSoundTouch,
      const size_t outputCount,
      WaveChannel &outputLeftTrack,
      WaveChannel &outputRightTrack);
   void Finalize(WaveTrack &orig, WaveTrack &out, const TimeWarper &warper);
 
   bool   mPreserveLength;
 
   int    mCurTrackNum;
 
   double m_maxNewLength;
};
 
#endif
 
#endif