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/******************************************************************************
*
* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/**
******************************************************************************
* @file ihevc_cabac_tables.h
*
* @brief
* This file contains enumerations, macros and extern declarations of HEVC
* cabac tables
*
* @author
* Ittiam
******************************************************************************
*/
#ifndef _IHEVC_CABAC_TABLES_H_
#define _IHEVC_CABAC_TABLES_H_
/*****************************************************************************/
/* Constant Macros */
/*****************************************************************************/
/**
******************************************************************************
* @brief maximum range of cabac_init_idc (0-2)
******************************************************************************
*/
#define IHEVC_NUM_CAB_IDC 3
/**
******************************************************************************
* @brief max range of qps in HEVC (0-51)
******************************************************************************
*/
#define IHEVC_MAX_QP 52
/*****************************************************************************/
/* Enums */
/*****************************************************************************/
/**
*****************************************************************************
* @brief start offsets of cabac contexts for various syntax elements
*
* @remarks Init ContextModel generation and these offsets are tightly coupled
See the cabac table generation utility for these offsets
*****************************************************************************
*/
typedef enum
{
IHEVC_CAB_SAO_MERGE = 0,
IHEVC_CAB_SAO_TYPE = IHEVC_CAB_SAO_MERGE + 1,
IHEVC_CAB_SPLIT_CU_FLAG = IHEVC_CAB_SAO_TYPE + 1,
IHEVC_CAB_CU_TQ_BYPASS_FLAG = IHEVC_CAB_SPLIT_CU_FLAG + 3,
IHEVC_CAB_SKIP_FLAG = IHEVC_CAB_CU_TQ_BYPASS_FLAG + 1,
IHEVC_CAB_QP_DELTA_ABS = IHEVC_CAB_SKIP_FLAG + 3,
IHEVC_CAB_PRED_MODE = IHEVC_CAB_QP_DELTA_ABS + 2,
IHEVC_CAB_PART_MODE = IHEVC_CAB_PRED_MODE + 1,
IHEVC_CAB_INTRA_LUMA_PRED_FLAG = IHEVC_CAB_PART_MODE + 4,
IHEVC_CAB_CHROMA_PRED_MODE = IHEVC_CAB_INTRA_LUMA_PRED_FLAG + 1,
IHEVC_CAB_MERGE_FLAG_EXT = IHEVC_CAB_CHROMA_PRED_MODE + 1,
IHEVC_CAB_MERGE_IDX_EXT = IHEVC_CAB_MERGE_FLAG_EXT + 1,
IHEVC_CAB_INTER_PRED_IDC = IHEVC_CAB_MERGE_IDX_EXT + 1,
IHEVC_CAB_INTER_REF_IDX = IHEVC_CAB_INTER_PRED_IDC + 5,
IHEVC_CAB_MVD_GRT0 = IHEVC_CAB_INTER_REF_IDX + 2,
IHEVC_CAB_MVD_GRT1 = IHEVC_CAB_MVD_GRT0 + 1,
IHEVC_CAB_MVP_L0L1 = IHEVC_CAB_MVD_GRT1 + 1,
IHEVC_CAB_NORES_IDX = IHEVC_CAB_MVP_L0L1 + 1,
IHEVC_CAB_SPLIT_TFM = IHEVC_CAB_NORES_IDX + 1,
IHEVC_CAB_CBF_LUMA_IDX = IHEVC_CAB_SPLIT_TFM + 3,
IHEVC_CAB_CBCR_IDX = IHEVC_CAB_CBF_LUMA_IDX + 2,
IHEVC_CAB_TFM_SKIP0 = IHEVC_CAB_CBCR_IDX + 4,
IHEVC_CAB_TFM_SKIP12 = IHEVC_CAB_TFM_SKIP0 + 1,
IHEVC_CAB_COEFFX_PREFIX = IHEVC_CAB_TFM_SKIP12 + 1,
IHEVC_CAB_COEFFY_PREFIX = IHEVC_CAB_COEFFX_PREFIX + 18,
IHEVC_CAB_CODED_SUBLK_IDX = IHEVC_CAB_COEFFY_PREFIX + 18,
IHEVC_CAB_COEFF_FLAG = IHEVC_CAB_CODED_SUBLK_IDX + 4,
IHEVC_CAB_COEFABS_GRTR1_FLAG = IHEVC_CAB_COEFF_FLAG + 42,
IHEVC_CAB_COEFABS_GRTR2_FLAG = IHEVC_CAB_COEFABS_GRTR1_FLAG + 24,
IHEVC_CAB_CTXT_END = IHEVC_CAB_COEFABS_GRTR2_FLAG + 6
}IHEVC_CABAC_CTXT_OFFSETS;
/*****************************************************************************/
/* Extern global declarations */
/*****************************************************************************/
/**
******************************************************************************
* @brief Table for rangeTabLPS depending on pStateIdx and qCodIRangeIdx
* input : pStateIdx(0-63) and qCodIRangeIdx(0-3) [(Range >> 6) & 0x3]
* output : RLps
*
* @remarks See Table 9-40 of HEVC spec for rangeTabLPS
*******************************************************************************
*/
extern const UWORD8 gau1_ihevc_cabac_rlps[64][4];
/**
******************************************************************************
* @brief probaility+MPS state transition tables based on cur State and bin
* input : curpState[bits7-2] | curMPS[bit1] | decodedBin[bit0]
* output : nextpState[bits6-1] | nextMPS[bit0]
* @remarks Modified form of Table-9-41 State Transition table in HEVC spec
******************************************************************************
*/
extern const UWORD8 gau1_ihevc_next_state[128*2];
/**
******************************************************************************
* @brief Init context tables for all combinations of qp and cabac_init_idc
* @remarks Packing format MPS in lsb and pState in bits[1-6]
******************************************************************************
*/
extern const UWORD8 gau1_ihevc_cab_ctxts[IHEVC_NUM_CAB_IDC][IHEVC_MAX_QP][IHEVC_CAB_CTXT_END];
#endif /* _IHEVC_CABAC_TABLES_H_ */
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