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cstrmbuf.h

// cstrmbuf.h : interface of bidirectional bit operations of packeted bitstream file
//
// This class provides a set of bit-based and byte-based functions
// to read information from packeted bitstream file in two direction and manage buffer.
//
//*****************************************************************************
// 
//                  MPEG Developing Classes
//
// Copyright (C) 1998, Vision and Neural Networks Laboratory, Computer Science 
// Department, Wayne State University, All Rights Reserved; 
//
//                  Disclaimer of Warranty
//
// MPEG Developing Classes, both binary and source (hereafter, Software)
// is copyrighted by Vision and Neural Networks Laboratory, Computer Science 
// Department, Wayne State University (WSU), and ownership remains with WSU.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files to use, copy,
// and distribute the software, provided that no charge is associated with 
// such copies and that the copyright notice and this statement appears on 
// all copies.
//
// THE SOFTWARE IS AVAILABLE TO THE USER ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THE 
// IMPLIED WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
// IN NO EVENT SHALL THE COPYRIGHT-HOLDER BE LIABLE FOR ANY CLAIMS, DAMAGES, OR
// OTHER LIABILITIES OF ANY KIND WHATSOEVER ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. THIS 
// DISCLAIMAER OF WARRANTY EXTENDS TO THE USER OF THIS SOFTWARE. ALSO THE WSU 
// DOES NOT REPRESENT OR WARRANT THAT THE SOFTWARE FURNISHED HEREUNDER ARE FREE OF
// INFRINGMENT OF ANY THIRD-PARTY PATENTS.
//
// Many patents of MPEG-1 and MPEG-2 are general enough such that commercial
// implementations, including shareware, are unavoidable subject to royalty fees to
// patent holders, regardless of implementation design.
//
//
// Vision and Neural Networks Laboratory,
// Computer Science Department,
// Wayne State University,
// Detroit, MI 48202.
// Dongge Li(dil@cs.wayne.edu) and Ishwar K. Sethi(sethi@cs.wayne.edu).
//

#if !defined CSTREAMBUF_H
#define CSTREAMBUF_H

#include <stdio.h>
#include "datatype.h"
#include "mpegdata.h"
#include "cobitbuf.h"
#include "cdlist.h"

const int MAX_PACKET_NUM=80;
const int SEARCH_BUF_SIZE=1024; 

typedef struct packetpos_tag
{
    long lPckHeadLength;
    long lDataFilePos;
    long lDataLength;
} PACKETPOS;

class CStreamBuf : public COBitBuf
{
// constructor and destructor
public:
    CStreamBuf();
    ~CStreamBuf();

// attributes
protected:
    FILE *pfFile;
    DWORD dwStreamID;
    CDList<PACKETPOS, MAX_PACKET_NUM> PacketList;
    long lBufStartPckPos, lBufEndPckPos;
    BYTE *pnSearchBuf;  // for packet searching;

// operation
public:
    int InitBuffer(FILE *pfTheFile, BYTE nStreamID, DWORD dwBufferSize);
    void SearchNextPckData(long lStartFilePos,PACKETPOS *pPckPos);
    void SearchPreviousPckData(long lStartFilePos,PACKETPOS *pPckPos);
    long FlushBuf(const PACKETPOS &PacketPos, long lPckOffset);
    long GetCurPacketPos(PACKETPOS *pPacketPos);
    bool IsPacketedStream(void) {return (dwStreamID==0) ? false : true;};

// override
public:
    void ResetBuffer(void);

protected: 
    virtual long FwdLoadData(long lLoadStartPos, DWORD dwItemNum);  // used by other functions
    virtual long BackLoadData(long lLoadEndPos, DWORD dwItemNum);   
    virtual long FlushBuf(long lOffset, BUFPOS *pBufPos);
};

#endif // CSTREAMBUF_H

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