mipstreambuffer.h

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/*
    
  This file is a part of EMIPLIB, the EDM Media over IP Library.
  
  Copyright (C) 2006-2011  Hasselt University - Expertise Centre for
                      Digital Media (EDM) (http://www.edm.uhasselt.be)

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  
  USA

*/

#ifndef MIPSTREAMBUFFER_H

#define MIPSTREAMBUFFER_H

#include "mipconfig.h"
#include "miptypes.h"
#include <jthread/jmutex.h>
#include <list>
#include <vector>

class EMIPLIB_IMPORTEXPORT MIPStreamBuffer
{
public:
        MIPStreamBuffer(int blockSize, int preAllocBlocks = 0);
        ~MIPStreamBuffer();

        void clear();

        void write(const void *pData, int amount);

        int read(void *pData, int amount);

        int getAmountBuffered() const;
private:
        class BufferBlock
        {
        public:
                BufferBlock(uint8_t *pData, int bytesFilled)                    { m_pData = pData; m_offset = 0; m_endPos = bytesFilled; }
                ~BufferBlock()                                                  { delete [] m_pData; }
                uint8_t *getData() const                                        { return m_pData; }
                void setOffset(int offset)                                      { m_offset = offset; }
                int getOffset() const                                           { return m_offset; }
                void setEndPos(int endPos)                                      { m_endPos = endPos; }
                int getEndPos() const                                           { return m_endPos; }
        private:
                uint8_t *m_pData;
                int m_offset;
                int m_endPos;
        };

        void releaseBlock(BufferBlock *pBlock);
        BufferBlock *acquireBlock();

        std::list<BufferBlock *> m_blocks;
        std::vector<BufferBlock *> m_preAllocatedBlocks;
        int m_blockSize;
        int m_bytesAvailable;
        int m_numPreAlloc;
        int m_numPreAllocAvailable;
        mutable jthread::JMutex m_mutex;
};

#endif // MIPSTREAMBUFFER_H