/****************************************************************************
*
*   Module Title :     TokenEntropy.h
*
*   Description  :     Entropy coding header file.
*
****************************************************************************/
#ifndef __INC_TOKEN_ENTROPY_H
#define __INC_TOKEN_ENTROPY_H

/****************************************************************************
*  Header Files
****************************************************************************/
#include "type_aliases.h"
#include "boolhuff.h"
#include "codec_common.h"
#include "huffman.h"

/****************************************************************************
*  Constants
****************************************************************************/

// VP6 hufman table AC bands
#define VP6_AC_BANDS			6

// Tokens								Value		Extra Bits (range + sign)
#define ZERO_TOKEN              0		//0			Extra Bits 0+0
#define ONE_TOKEN               1		//1			Extra Bits 0+1       
#define TWO_TOKEN               2		//2			Extra Bits 0+1 
#define THREE_TOKEN             3		//3			Extra Bits 0+1
#define FOUR_TOKEN              4		//4			Extra Bits 0+1
#define DCT_VAL_CATEGORY1		5		//5-6		Extra Bits 1+1
#define DCT_VAL_CATEGORY2		6		//7-10		Extra Bits 2+1
#define DCT_VAL_CATEGORY3		7		//11-26		Extra Bits 4+1
#define DCT_VAL_CATEGORY4		8		//11-26		Extra Bits 5+1
#define DCT_VAL_CATEGORY5		9		//27-58		Extra Bits 5+1
#define DCT_VAL_CATEGORY6		10		//59+		Extra Bits 11+1	
#define DCT_EOB_TOKEN           11		//EOB		Extra Bits 0+0
#define MAX_ENTROPY_TOKENS      (DCT_EOB_TOKEN + 1)  
#define ILLEGAL_TOKEN			255

#define DC_TOKEN_CONTEXTS		3 // 00, 0!0, !0!0
#define CONTEXT_NODES			(MAX_ENTROPY_TOKENS-7)

#define PREC_CASES				3
#define ZERO_RUN_PROB_CASES     14 

#define DC_PROBABILITY_UPDATE_THRESH	100

#define ZERO_CONTEXT_NODE		0
#define EOB_CONTEXT_NODE		1
#define ONE_CONTEXT_NODE		2
#define LOW_VAL_CONTEXT_NODE	3
#define TWO_CONTEXT_NODE		4
#define THREE_CONTEXT_NODE		5
#define HIGH_LOW_CONTEXT_NODE	6
#define CAT_ONE_CONTEXT_NODE	7
#define CAT_THREEFOUR_CONTEXT_NODE	8
#define CAT_THREE_CONTEXT_NODE	9
#define CAT_FIVE_CONTEXT_NODE	10

#define PROB_UPDATE_BASELINE_COST	7

#define MAX_PROB				254
#define DCT_MAX_VALUE			2048

#define ZRL_BANDS				2
#define ZRL_BAND2				6

#define SCAN_ORDER_BANDS		16
#define SCAN_BAND_UPDATE_BITS   4

/****************************************************************************
*  Typedefs
****************************************************************************/        
typedef struct LineEq
{
    INT32	M;
    INT32	C;
} LINE_EQ;

/****************************************************************************
*  Exports
****************************************************************************/        
extern const UINT32 VP6_ProbCost[256];
extern const UINT8  ExtraBitLengths_VP6[MAX_ENTROPY_TOKENS];
extern const UINT32 VP6_DctRangeMinVals[MAX_ENTROPY_TOKENS];

extern const UINT8 VP6_DcUpdateProbs[2][MAX_ENTROPY_TOKENS-1];
extern const UINT8 VP6_AcUpdateProbs[PREC_CASES][2][VP6_AC_BANDS][MAX_ENTROPY_TOKENS-1];
extern const UINT8 VP6_PrevTokenIndex[MAX_ENTROPY_TOKENS];

extern const UINT8 ScanBandUpdateProbs[BLOCK_SIZE];

extern const UINT8 ZrlUpdateProbs[ZRL_BANDS][ZERO_RUN_PROB_CASES];
extern const UINT8 ZeroRunProbDefaults[ZRL_BANDS][ZERO_RUN_PROB_CASES];

extern UINT8 PrecZeroRunLength[BLOCK_SIZE];

#endif