huffman.h

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/*************************************************************************

This software module was originally developed by 

	Ming-Chieh Lee ([e-mail]), Microsoft Corporation
	Wei-ge Chen ([e-mail]), Microsoft Corporation
	Bruce Lin ([e-mail]), Microsoft Corporation
	Chuang Gu ([e-mail]), Microsoft Corporation
	(date: March, 1996)

and edited by
	Yoshihiro Kikuchi (TOSHIBA CORPORATION)
	Takeshi Nagai (TOSHIBA CORPORATION)
	Toshiaki Watanabe (TOSHIBA CORPORATION)
	Noboru Yamaguchi (TOSHIBA CORPORATION)
    Sehoon Son ([e-mail]) Samsung AIT

in the course of development of the MPEG-4 Video (ISO/IEC 14496-2). 
This software module is an implementation of a part of one or more MPEG-4 Video tools 
as specified by the MPEG-4 Video. 
ISO/IEC gives users of the MPEG-4 Video free license to this software module or modifications 
thereof for use in hardware or software products claiming conformance to the MPEG-4 Video. 
Those intending to use this software module in hardware or software products are advised that its use may infringe existing patents. 
The original developer of this software module and his/her company, 
the subsequent editors and their companies, 
and ISO/IEC have no liability for use of this software module or modifications thereof in an implementation. 
Copyright is not released for non MPEG-4 Video conforming products. 
Microsoft retains full right to use the code for his/her own purpose, 
assign or donate the code to a third party and to inhibit third parties from using the code for non <MPEG standard> conforming products. 
This copyright notice must be included in all copies or derivative works. 

Copyright (c) 1996, 1997.

Module Name:
	
	huffman.h

Abstract:

	Classes for Huffman encode/decode.

Revision History:

*************************************************************************/

#ifndef _HUFFMAN_H_
#define _HUFFMAN_H_

typedef struct VlcTableTag 
{
    char *pchBits;
} VlcTable;

#define HUFFMAN_DEC_STRUCT_SIZE         16
typedef struct tag_CHuffmanDecoderNode
{
    Int m_c0End;
    Int m_c1End; 
    Int m_l0NextNodeOrSymbol;
    Int m_l1NextNodeOrSymbol;
}HUFFMAN_DEC_STRUCT, *PHUFFMAN_DEC_STRUCT, **PPHUFFMAN_DEC_STRUCT __attribute__ ((aligned (32)));

#ifdef FAST_LUT_DECODE
#define SYM_TAB_LEN 256		// number of elements in symbol table
#define SYM_TAB_BITS 8		// log2 of SYM_TAB_LEN
#define LUT_EXTRA	1 // used to be 4 but changed the math in the allocation
#else
#define LUT_EXTRA	0
#endif

#define MAX_TABLE_SIZE_CBPY                    (38 + LUT_EXTRA)
#define MAX_TABLE_SIZE_INTRA_DCY        (33 + LUT_EXTRA)
#define MAX_TABLE_SIZE_INTRA_DCC        (33 + LUT_EXTRA)
#define MAX_TABLE_SIZE_MBTYPE_BVOP   (24 + LUT_EXTRA)
#define MAX_TABLE_SIZE_MCBPC_INTRA   (29 + LUT_EXTRA)
#define MAX_TABLE_SIZE_MCBPC_INTER    (41 + LUT_EXTRA)
#define MAX_TABLE_SIZE_MV                       (85 + LUT_EXTRA)
#define MAX_TABLE_SIZE_DCT                     (123 + LUT_EXTRA)
#define MAX_TABLE_SIZE_DCT_INTRA        (123 + LUT_EXTRA)


Void loadTable (VlcTable *pVlc, PPHUFFMAN_DEC_STRUCT);//load huffman table from array
Int decodeSymbol (PPHUFFMAN_DEC_STRUCT); //return one decoded symbol from the attached CInBitStream
Void CEntropyDecoderSet ();	// create and attach encoders

#ifdef USE_BSFAST
Int decodeSymbol_WithFastBS(PPHUFFMAN_DEC_STRUCT pPHD,  UInt cbits, UInt *pbitsused);
#endif

#ifdef DUAL_MODE
PPHUFFMAN_DEC_STRUCT realloc (Int lOldSize,Int lNewSize, PPHUFFMAN_DEC_STRUCT);
#endif
#endif