FifoBuffer.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  FifoBuffer.h
 
  Dmitry Vedenko
 
**********************************************************************/
 
#pragma once
 
#include <cstdint>
#include <deque>
#include <queue>
 
class FFMPEG_SUPPORT_API FifoBuffer final
{
public:
   explicit FifoBuffer(int pageSize);
 
   int64_t Write(const void* data, int64_t size);
   int64_t Read(void* data, int64_t size);
 
   int64_t GetAvailable() const;
 
private:
   struct Page final
   {
      explicit Page(int size);
 
      void Reset();
 
      std::vector<char> Data;
      int WritePosition {};
      int ReadPosition {};
   };
 
   std::deque<Page> mAllocatedPages;
 
   std::queue<Page*> mActivePages;
   std::deque<Page*> mFreePages;
 
   int64_t mAvaliable {};
   const int mPageSize {};
};