samplebuffer.h

Qtopia下的多媒体录音源码

/****************************************************************************
**
** Copyright (C) 2000-2006 TROLLTECH ASA. All rights reserved.
**
** This file is part of the Phone Edition of the Qtopia Toolkit.
**
** Licensees holding a valid license agreement from Trolltech or any of its
** authorized distributors may use this file in accordance with
** the License Agreement provided with the Licensed Software.
**
** See http://www.trolltech.com/pricing.html or email [e-mail] for
**   information about Trolltech's Commercial License Agreements.
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** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
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**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/
#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