AudioIOListener.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  AudioIOListener.h
 
  Dominic Mazzoni
 
  Use the PortAudio library to play and record sound
 
**********************************************************************/
 
#ifndef __AUDACITY_AUDIO_IO_LISTENER__
#define __AUDACITY_AUDIO_IO_LISTENER__
 
class WritableSampleTrack;
using WritableSampleTrackArray =
   std::vector < std::shared_ptr < WritableSampleTrack > >;
 
class AUDIO_IO_API AudioIOListener /* not final */ {
public:
   AudioIOListener() {}
   virtual ~AudioIOListener() {}
 
   // Pass 0 when audio stops, positive when it starts:
   virtual void OnAudioIORate(int rate) = 0;
 
   virtual void OnAudioIOStartRecording() = 0;
   virtual void OnAudioIOStopRecording() = 0;
   virtual void OnAudioIONewBlocks(const WritableSampleTrackArray *tracks) = 0;
 
   // Commit the addition of temporary recording tracks into the project
   virtual void OnCommitRecording() = 0;
 
   // During recording, the threshold for sound activation has been crossed
   // in either direction
   virtual void OnSoundActivationThreshold() = 0;
 
};
 
#endif