SampleTrackSource.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  @file SampleTrackSource.h
  @brief Adapter of SampleTrack to the interface AudioGraph::Source
 
  Dominic Mazzoni
  Vaughan Johnson
 
  Paul Licameli split from PerTrackEffect.h
 
**********************************************************************/
 
#ifndef __AUDACITY_SAMPLE_TRACK_SOURCE__
#define __AUDACITY_SAMPLE_TRACK_SOURCE__
 
#include "AudioGraphSource.h" // to inherit
#include "SampleCount.h"
#include <functional>
 
class SampleTrack;
 
class SAMPLE_TRACK_API SampleTrackSource final : public AudioGraph::Source {
public:
   using Poller = std::function<bool(sampleCount blockSize)>;
 
   SampleTrackSource(const SampleTrack &left, const SampleTrack *pRight,
      sampleCount start, sampleCount len, Poller pollUser);
   ~SampleTrackSource() override;
 
   bool AcceptsBuffers(const Buffers &buffers) const override;
 
   bool AcceptsBlockSize(size_t blockSize) const override;
 
   std::optional<size_t> Acquire(Buffers &data, size_t bound) override;
   sampleCount Remaining() const override;
   bool Release() override;
private:
   const SampleTrack &mLeft;
   const SampleTrack *const mpRight;
   const Poller mPollUser;
 
   sampleCount mPos{};
   sampleCount mOutputRemaining{};
   size_t mLastProduced{};
   size_t mFetched{};
   bool mInitialized{ false };
};
#endif