samplebuffer.h

基于linux的录音程序

/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** 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