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/*************************************************************************** *
* MPEG Layer3-Audio Decoder
* © 1997-2006 by Fraunhofer IIS
* All Rights Reserved
*
* filename: huffmandecoder.h
* project : MPEG Decoder
* author : Martin Sieler
* date : 1998-02-08
* contents/description: HEADER - huffman decoder
*
*
\***************************************************************************/
/*
* $Date: 2011/01/21 22:25:58 $
* $Id: huffmandecoder.h,v 1.4 2011/01/21 22:25:58 audiodsp Exp $
*/
#ifndef __HUFFMANDECODER_H__
#define __HUFFMANDECODER_H__
/* ------------------------ includes --------------------------------------*/
#include "bitsequence.h"
#include "huffmanbitobj.h"
#include "huffmantable.h"
/*-------------------------- defines --------------------------------------*/
class CBitStream;
/*-------------------------------------------------------------------------*/
//
// Huffman decoder (helper) class.
//
// This object reads and decodes MPEG Layer-3 huffman data.
//
class CHuffmanDecoder
{
public:
CHuffmanDecoder();
virtual ~CHuffmanDecoder();
int ReadHuffmanCode(CBitStream &Bs,
int *pIsp,
const int *pTableSelect,
const int *pRegionEnd,
int Count1TableSelect,
int Part2_3Length);
protected:
private:
int ReadBigValues(CBitStream &Bs,
int *pIsp,
const int *pTableSelect,
const int *pRegionEnd);
int ReadCount1Area(CBitStream &Bs,
int *pIsp,
int Count1TableSelect,
int Count1Start,
int Part2_3Length);
#ifdef _MSC_VER
// these only have one caller and inlining shows notable improvements in the profiler
__forceinline void ReadHuffmanDual (CBitStream &Bs, int *pIsp);
__forceinline void ReadHuffmanDualLin(CBitStream &Bs, int *pIsp);
__forceinline bool ReadHuffmanQuad (CBitStream &Bs, int *pIsp);
#else
void ReadHuffmanDual (CBitStream &Bs, int *pIsp);
void ReadHuffmanDualLin(CBitStream &Bs, int *pIsp);
bool ReadHuffmanQuad (CBitStream &Bs, int *pIsp);
#endif
CHuffmanTable m_HuffmanTable;
CHuffmanBitObj m_HuffmanBitObj;
CBitSequence m_LinBits;
};
/*-------------------------------------------------------------------------*/
#endif
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