diff options
Diffstat (limited to 'common/ihevc_cabac_tables.h')
| -rw-r--r-- | common/ihevc_cabac_tables.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/common/ihevc_cabac_tables.h b/common/ihevc_cabac_tables.h new file mode 100644 index 0000000..9ed1a2c --- /dev/null +++ b/common/ihevc_cabac_tables.h @@ -0,0 +1,137 @@ +/****************************************************************************** +* +* 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_ */ |