103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
|
/***************************************************************************\
|
|||
|
|
*
|
|||
|
|
* MPEG Layer3-Audio Decoder
|
|||
|
|
* <EFBFBD> 1997-2006 by Fraunhofer IIS
|
|||
|
|
* All Rights Reserved
|
|||
|
|
*
|
|||
|
|
* filename: huffmantable.h
|
|||
|
|
* project : MPEG Decoder
|
|||
|
|
* author : Martin Sieler
|
|||
|
|
* date : 1998-01-05
|
|||
|
|
* contents/description: HEADER - huffman table object
|
|||
|
|
*
|
|||
|
|
*
|
|||
|
|
\***************************************************************************/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* $Date: 2011/01/18 23:00:53 $
|
|||
|
|
* $Id: huffmantable.h,v 1.3 2011/01/18 23:00:53 audiodsp Exp $
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#ifndef __HUFFMANTABLE_H__
|
|||
|
|
#define __HUFFMANTABLE_H__
|
|||
|
|
|
|||
|
|
/* ------------------------ includes --------------------------------------*/
|
|||
|
|
|
|||
|
|
/*-------------------------- defines --------------------------------------*/
|
|||
|
|
|
|||
|
|
#define HUFFMAN_BITS_4
|
|||
|
|
|
|||
|
|
/*-------------------------------------------------------------------------*/
|
|||
|
|
|
|||
|
|
// Huffman tables.
|
|||
|
|
//
|
|||
|
|
// This object holds the huffman table for ISO/MPEG Layer-3.
|
|||
|
|
//
|
|||
|
|
typedef struct
|
|||
|
|
{
|
|||
|
|
const unsigned char length;
|
|||
|
|
const unsigned char value;
|
|||
|
|
} huffman_entry_t;
|
|||
|
|
|
|||
|
|
class CHuffmanTable
|
|||
|
|
{
|
|||
|
|
public:
|
|||
|
|
|
|||
|
|
/*unsigned int nTableIndex; */
|
|||
|
|
CHuffmanTable();
|
|||
|
|
virtual ~CHuffmanTable();
|
|||
|
|
|
|||
|
|
void SetTableIndex(unsigned int _nTableIndex)
|
|||
|
|
{ nTableIndex = _nTableIndex; }
|
|||
|
|
|
|||
|
|
unsigned int GetBitsPerLevel() const
|
|||
|
|
{ return BITS_PER_LEVEL; }
|
|||
|
|
|
|||
|
|
unsigned int GetLinBits() const
|
|||
|
|
{ return ht[nTableIndex].linbits; }
|
|||
|
|
|
|||
|
|
unsigned char GetCode (unsigned int nIndex, unsigned int nValue) const
|
|||
|
|
{ return (ht[nTableIndex].table[nIndex][nValue] & 0xff); }
|
|||
|
|
|
|||
|
|
unsigned char GetLength(unsigned int nIndex, unsigned int nValue) const
|
|||
|
|
{ return ((ht[nTableIndex].table[nIndex][nValue] >> 8) & 0xff); }
|
|||
|
|
|
|||
|
|
bool IsTableValid() const
|
|||
|
|
{ return (ht[nTableIndex].table ? true:false); }
|
|||
|
|
|
|||
|
|
bool IsLengthZero(unsigned int nIndex, unsigned int nValue) const
|
|||
|
|
{ return ((ht[nTableIndex].table[nIndex][nValue] & 0xff00) == 0); }
|
|||
|
|
|
|||
|
|
enum
|
|||
|
|
{
|
|||
|
|
#if defined HUFFMAN_BITS_2 /* HuffmanBits parallel huffman tables */
|
|||
|
|
BITS_PER_LEVEL = 2,
|
|||
|
|
ENTRIES_PER_LEVEL = 4
|
|||
|
|
#elif defined HUFFMAN_BITS_3
|
|||
|
|
BITS_PER_LEVEL = 3,
|
|||
|
|
ENTRIES_PER_LEVEL = 8
|
|||
|
|
#elif defined HUFFMAN_BITS_4 /* HuffmanBits parallel huffman tables */
|
|||
|
|
BITS_PER_LEVEL = 4,
|
|||
|
|
ENTRIES_PER_LEVEL = 16
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
protected:
|
|||
|
|
|
|||
|
|
private:
|
|||
|
|
|
|||
|
|
typedef struct
|
|||
|
|
{
|
|||
|
|
unsigned int linbits;
|
|||
|
|
const unsigned short(*table)[ENTRIES_PER_LEVEL];
|
|||
|
|
} huffmantab;
|
|||
|
|
|
|||
|
|
static const huffmantab ht[];
|
|||
|
|
|
|||
|
|
unsigned int nTableIndex;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/*-------------------------------------------------------------------------*/
|
|||
|
|
#endif
|