/****************************************************************************** * * 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_ */