DoubleBuffer.hxx

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/*
 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef __DOUBLEBUFFER__
#define __DOUBLEBUFFER__

#include "ErrOutOfMemory.hxx"
#include "CLAM_windows.h"
#undef GetClassName

namespace CLAM
{

struct DoubleBuffer
{
        short*   mFrontBuffer;
        short*   mBackBuffer;
        short*   mBuffA;
        short*   mBuffB;
        unsigned mLen;
        //bool     mBackBufferReady;
        HANDLE   mBackBufferReady;

        DoubleBuffer()
                : mBuffA( NULL ), mBuffB( NULL ), mLen(0), mBackBufferReady( false )
        {
                mBackBufferReady = CreateEvent( NULL, TRUE, FALSE, NULL );
        }

        ~DoubleBuffer()
        {
                if ( mBuffA )
                        delete [] mBuffA;
                if ( mBuffB )
                        delete [] mBuffB;
        }

        void Allocate( unsigned nelems ) throw (ErrOutOfMemory);

        inline void DeAllocate()
        {
                if ( mBuffA )
                        delete [] mBuffA;
                if ( mBuffB )
                        delete [] mBuffB;

                mBuffA = NULL;
                mBuffB = NULL;
                mFrontBuffer = NULL;
                mBackBuffer = NULL;
        }

        void SwapBuffers()
        {
                short* temp;
                temp = mFrontBuffer;
                mFrontBuffer = mBackBuffer;
                mBackBuffer = temp;
                SetEvent( mBackBufferReady );
        }

        inline unsigned GetSize() const
        {
                return mLen;
        }

};


struct FullDuplexDoubleBuffer
{
        DoubleBuffer* mInputDblBuff;
        DoubleBuffer* mOutputDblBuff;

        inline unsigned GetSize()
        {
                return mInputDblBuff->mLen;
        }
};

}

#endif // DoubleBuffer.hxx

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