CrossFade.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  CrossFade.h
 
 (c) 2005 The Audacity Team
  Licensed under the GPL version 2.0
 
**********************************************************************/
#ifndef __AUDACITY_CROSSFADE__
#define __AUDACITY_CROSSFADE__
 
 
#include "WaveClip.h"
 
 
enum FadeType
{
   FT_MIX,
   FT_TRIANGULAR,
   FT_EXPONENTIAL
};
 
class CrossFader
{
 
 public:
  CrossFader();
  ~CrossFader();
 
  //This sets a crossfade mode where the overlapping
  //tracks are simply mixed equally.
  void SetMixCrossFade(){mType = FT_MIX;};
  void SetTriangularCrossFade(){mType = FT_TRIANGULAR;};
  void SetExponentialCrossFade(){mType = FT_EXPONENTIAL;};
 
  void ClearClips();
  //Produces samples according to crossfading rules.
  bool  GetSamples(samplePtr buffer, sampleFormat format,
                   sampleCount start, size_t len);
 
 protected:
  WaveClipHolders mClips;
 
 private:
 
  bool CrossFadeMix(samplePtr buffer, sampleFormat format, sampleCount start, size_t len);
 
  FadeType mType;
 
 
};
 
 
 
#endif