AudioIOExt.h

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/*!********************************************************************
 
 Audacity: A Digital Audio Editor
 
 @file AudioIOExt.h
 @brief Abstract base class for hooks into audio playback procedures
 
 Paul Licameli
 
 **********************************************************************/
 
#ifndef __AUDACITY_AUDIO_IO_EXT__
#define __AUDACITY_AUDIO_IO_EXT__
 
#include <functional>
#include <memory>
#include <vector>
 
#include <wx/string.h>
 
#include "AudioIOBase.h"
 
struct PaStreamCallbackTimeInfo;
struct PaStreamInfo;
struct PlaybackSchedule;
struct TransportSequences;
 
class AUDIO_IO_API AudioIOExt : public AudioIOExtBase
{
public:
   using Factory = std::function<
      std::unique_ptr<AudioIOExt>( const PlaybackSchedule& ) >;
   using Factories = std::vector<AudioIOExt::Factory>;
   static Factories &GetFactories();
 
   struct AUDIO_IO_API RegisteredFactory{
      explicit RegisteredFactory(Factory factory);
      ~RegisteredFactory();
   };
 
   virtual ~AudioIOExt();
 
   // Formerly in AudioIoCallback
   virtual void ComputeOtherTimings(double rate, bool paused,
      const PaStreamCallbackTimeInfo *timeInfo,
      unsigned long framesPerBuffer) = 0;
   virtual void SignalOtherCompletion() = 0;
   virtual unsigned CountOtherSolo() const = 0;
 
   // Formerly in AudioIO
   virtual bool StartOtherStream(const TransportSequences &tracks,
      const PaStreamInfo* info, double startTime, double rate) = 0;
   virtual void AbortOtherStream() = 0;
   virtual void FillOtherBuffers(
      double rate, unsigned long pauseFrames, bool paused, bool hasSolo) = 0;
   virtual void StopOtherStream() = 0;
};
 
#endif