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/*************************************************************************** *
* MPEG Layer3-Audio Decoder
* © 1997-2006 by Fraunhofer IIS
* All Rights Reserved
*
* filename: bitstream.h
* project : MPEG Decoder
* author : Martin Sieler
* date : 1997-12-05
* contents/description: generic bitbuffer - HEADER
*
*
\***************************************************************************/
/*
* $Date: 2011/01/18 18:22:02 $
* $Id: bitstream.h,v 1.4 2011/01/18 18:22:02 audiodsp Exp $
*/
#ifndef __BITSTREAM_H__
#define __BITSTREAM_H__
/* ------------------------ includes --------------------------------------*/
/*-------------------------- defines --------------------------------------*/
class CGioBase;
/*-------------------------------------------------------------------------*/
//
// Bitstream input class.
//
// This class defines the interface that the mp3 decoder object will
// read all of its bitstream input data from.
//
class CBitStream
{
public:
CBitStream(int cbSize);
CBitStream(unsigned char *pBuf, int cbSize, bool fDataValid = false);
virtual ~CBitStream();
virtual void Reset();
bool ByteAligned() const { return !(m_BitNdx & 7); }
bool ResetOccurred() { return m_ResetOccurred; }
void SetResetState(bool state) { m_ResetOccurred = state; }
void Connect(CGioBase *pGB);
void ResetBitCnt() { m_BitCnt = 0; }
int GetBitCnt() const { return m_BitCnt; }
unsigned int GetBits(unsigned int nBits); // gets 16 bits or less
unsigned int GetBits8(unsigned int nBits); // gets 8 bits or less
unsigned int Get1Bit();
unsigned long Get32Bits();
bool Ff(int nBits) { return ( (nBits > 0) ? Seek(nBits) : false); }
bool Rewind(int nBits) { return ( (nBits > 0) ? Seek(-nBits) : false); }
bool Seek(int nBits)
{
m_BitCnt += nBits;
m_ValidBits -= nBits;
m_BitNdx = (m_BitNdx+nBits) & m_bitMask;
return true;
}
int GetValidBits() const { return m_ValidBits; }
int GetFree() const;
void SetEof();
int Fill(const unsigned char *pBuf, int cbSize);
int Fill(CBitStream &Bs, int cbSize);
protected:
int Refill();
bool IsEof() const;
bool IsConnected() const;
private:
CGioBase *m_pGB; // I/O object
int m_nBytes; // size of buffer in bytes
int m_mask;
int m_nBits; // size of buffer in bits
int m_bitMask;
int m_ValidBits; // valid bits in buffer
int m_ReadOffset; // where to write next
int m_BitCnt; // bit counter
int m_BitNdx; // position of next bit in byte
bool m_fEof; // indication of input eof
unsigned char *m_Buf; // the buffer
bool m_fBufferIntern; // did we allocate the buffer ourselves
bool m_ResetOccurred; // reset just occurred, only for dynamic buffer used
};
/*-------------------------------------------------------------------------*/
#endif
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