| /****************************************************************************** |
| * |
| * 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_ */ |
