samplebuffer.h

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2005 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
** 
** 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.
** 
** A copy of the GNU GPL license version 2 is included in this package as 
** LICENSE.GPL.
**
** 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.
**
** In addition, as a special exception Trolltech gives permission to link
** the code of this program with Qtopia applications copyrighted, developed
** and distributed by Trolltech under the terms of the Qtopia Personal Use
** License Agreement. You must comply with the GNU General Public License
** in all respects for all of the code used other than the applications
** licensed under the Qtopia Personal Use License Agreement. If you modify
** this file, you may extend this exception to your version of the file,
** but you are not obligated to do so. If you do not wish to do so, delete
** this exception statement from your version.
** 
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef SAMPLEBUFFER_H
#define SAMPLEBUFFER_H

#include <qglobal.h>


class SampleBuffer
{
public:
    SampleBuffer( unsigned int blockSize, unsigned int maxBlocks = 0 );
    ~SampleBuffer();

    bool nextWriteBuffer( short *& buf, unsigned int& length );
    void commitWriteBuffer ( unsigned int length );
    void rewind();
    bool nextReadBuffer( short *& buf, unsigned int& length );
    void clear();

private:
    struct BufferBlock
    {
	struct BufferBlock *next;
	unsigned int size;
	short data[1];
    };

private:
    BufferBlock *first;
    BufferBlock *readPosn;
    BufferBlock *writePosn;
    unsigned int blockSize;
    unsigned int numBlocks;
    unsigned int maxBlocks;

    void init();
    void clearAll();
};


#endif