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/*************************************************************************** *
* MPEG Layer3-Audio Decoder
* © 1997-2006 by Fraunhofer IIS
* All Rights Reserved
*
* filename: bitsequence.h
* project : MPEG Decoder
* author : Martin Sieler
* date : 1997-12-23
* contents/description: HEADER - bitsequence object
*
*
\***************************************************************************/
/*
* $Date: 2010/11/17 20:46:01 $
* $Id: bitsequence.h,v 1.1 2010/11/17 20:46:01 audiodsp Exp $
*/
#ifndef __BITSEQUENCE_H__
#define __BITSEQUENCE_H__
/* ------------------------ includes --------------------------------------*/
#include "bitstream.h"
/*-------------------------- defines --------------------------------------*/
/*-------------------------------------------------------------------------*/
//
// Bitstream parser class.
//
// This helper class is basically a numerical value that can read itself from
// a CBitStream interface for convenience. The decoder almost completely
// does the bitstream parsing through CBitSequence rather than CBitStream
// directly.
//
class CBitSequence
{
public:
CBitSequence(int nBits = 0) { m_nBits = nBits; m_nValue = 0; }
virtual ~CBitSequence() {}
void SetNumberOfBits(int nBits) { m_nBits = nBits; }
int GetNumberOfBits() const { return m_nBits; }
bool ReadFrom(CBitStream &Bs) { m_nValue = Bs.GetBits(m_nBits); return true; }
bool ReadFrom_Bit(CBitStream &Bs) { m_nValue = Bs.Get1Bit(); return true; }
bool ReadFrom(CBitStream &Bs, int nBits) { SetNumberOfBits(nBits); return ReadFrom(Bs); }
bool Equals(int nValue) const { return (m_nValue == nValue); }
int ToInt() const { return m_nValue; }
void FromInt(int nValue) { m_nValue = nValue; }
protected:
private:
int m_nBits;
int m_nValue;
};
/*-------------------------------------------------------------------------*/
#endif
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