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/*************************************************************************** *
* MPEG Layer3-Audio Decoder
* © 1997-2006 by Fraunhofer IIS
* All Rights Reserved
*
* filename: mpegbitstream.h
* project : MPEG Decoder
* author : Martin Sieler
* date : 1997-12-05
* contents/description: MPEG bitstream - HEADER
*
*
\***************************************************************************/
/*
* $Date: 2010/11/17 20:46:04 $
* $Id: mpegbitstream.h,v 1.1 2010/11/17 20:46:04 audiodsp Exp $
*/
#ifndef __MPEGBITSTREAM_H__
#define __MPEGBITSTREAM_H__
/* ------------------------ includes --------------------------------------*/
#include "bitstream.h"
#include "mpegheader.h"
#include "mp3sscdef.h"
/*-------------------------- defines --------------------------------------*/
/*-------------------------------------------------------------------------*/
//
// MPEG bitstream class.
//
// This object is derived from CBitStream. In addition to CBitStream
// this object is able to sync to the next ISO/MPEG header position.
//
class CMpegBitStream : public CBitStream
{
public:
CMpegBitStream(int cbSize);
CMpegBitStream(unsigned char *pBuf, int cbSize, bool fDataValid = false);
virtual ~CMpegBitStream();
virtual void Reset();
SSC DoSync();
int GetSyncPosition() const { return m_SyncPosition; }
const CMpegHeader *GetHdr() const { return &m_Hdr; }
protected:
private:
SSC DoSyncInitial();
SSC DoSyncContinue();
enum { FRAMES_TO_CHECK = 10 };
CMpegHeader m_Hdr; // mpeg header
unsigned long m_FirstHdr; // "relevant" bits of first good header
unsigned long m_nFramesToCheck; // # frames to be checked for next mpeg header
int m_SyncPosition; // offset of first sync in bits
SSC m_SyncState; // last sync state
};
/*-------------------------------------------------------------------------*/
#endif
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