1 /****************************************************************************** 2 * 3 * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 /** 20 ****************************************************************************** 21 * @file ihevc_cabac_tables.h 22 * 23 * @brief 24 * This file contains enumerations, macros and extern declarations of HEVC 25 * cabac tables 26 * 27 * @author 28 * Ittiam 29 ****************************************************************************** 30 */ 31 32 #ifndef _IHEVC_CABAC_TABLES_H_ 33 #define _IHEVC_CABAC_TABLES_H_ 34 35 /*****************************************************************************/ 36 /* Constant Macros */ 37 /*****************************************************************************/ 38 39 /** 40 ****************************************************************************** 41 * @brief maximum range of cabac_init_idc (0-2) 42 ****************************************************************************** 43 */ 44 #define IHEVC_NUM_CAB_IDC 3 45 46 /** 47 ****************************************************************************** 48 * @brief max range of qps in HEVC (0-51) 49 ****************************************************************************** 50 */ 51 #define IHEVC_MAX_QP 52 52 53 54 /*****************************************************************************/ 55 /* Enums */ 56 /*****************************************************************************/ 57 58 /** 59 ***************************************************************************** 60 * @brief start offsets of cabac contexts for various syntax elements 61 * 62 * @remarks Init ContextModel generation and these offsets are tightly coupled 63 See the cabac table generation utility for these offsets 64 ***************************************************************************** 65 */ 66 typedef enum 67 { 68 IHEVC_CAB_SAO_MERGE = 0, 69 IHEVC_CAB_SAO_TYPE = IHEVC_CAB_SAO_MERGE + 1, 70 IHEVC_CAB_SPLIT_CU_FLAG = IHEVC_CAB_SAO_TYPE + 1, 71 IHEVC_CAB_CU_TQ_BYPASS_FLAG = IHEVC_CAB_SPLIT_CU_FLAG + 3, 72 IHEVC_CAB_SKIP_FLAG = IHEVC_CAB_CU_TQ_BYPASS_FLAG + 1, 73 IHEVC_CAB_QP_DELTA_ABS = IHEVC_CAB_SKIP_FLAG + 3, 74 IHEVC_CAB_PRED_MODE = IHEVC_CAB_QP_DELTA_ABS + 2, 75 IHEVC_CAB_PART_MODE = IHEVC_CAB_PRED_MODE + 1, 76 IHEVC_CAB_INTRA_LUMA_PRED_FLAG = IHEVC_CAB_PART_MODE + 4, 77 IHEVC_CAB_CHROMA_PRED_MODE = IHEVC_CAB_INTRA_LUMA_PRED_FLAG + 1, 78 IHEVC_CAB_MERGE_FLAG_EXT = IHEVC_CAB_CHROMA_PRED_MODE + 1, 79 IHEVC_CAB_MERGE_IDX_EXT = IHEVC_CAB_MERGE_FLAG_EXT + 1, 80 IHEVC_CAB_INTER_PRED_IDC = IHEVC_CAB_MERGE_IDX_EXT + 1, 81 IHEVC_CAB_INTER_REF_IDX = IHEVC_CAB_INTER_PRED_IDC + 5, 82 IHEVC_CAB_MVD_GRT0 = IHEVC_CAB_INTER_REF_IDX + 2, 83 IHEVC_CAB_MVD_GRT1 = IHEVC_CAB_MVD_GRT0 + 1, 84 IHEVC_CAB_MVP_L0L1 = IHEVC_CAB_MVD_GRT1 + 1, 85 IHEVC_CAB_NORES_IDX = IHEVC_CAB_MVP_L0L1 + 1, 86 IHEVC_CAB_SPLIT_TFM = IHEVC_CAB_NORES_IDX + 1, 87 IHEVC_CAB_CBF_LUMA_IDX = IHEVC_CAB_SPLIT_TFM + 3, 88 IHEVC_CAB_CBCR_IDX = IHEVC_CAB_CBF_LUMA_IDX + 2, 89 IHEVC_CAB_TFM_SKIP0 = IHEVC_CAB_CBCR_IDX + 4, 90 IHEVC_CAB_TFM_SKIP12 = IHEVC_CAB_TFM_SKIP0 + 1, 91 IHEVC_CAB_COEFFX_PREFIX = IHEVC_CAB_TFM_SKIP12 + 1, 92 IHEVC_CAB_COEFFY_PREFIX = IHEVC_CAB_COEFFX_PREFIX + 18, 93 IHEVC_CAB_CODED_SUBLK_IDX = IHEVC_CAB_COEFFY_PREFIX + 18, 94 IHEVC_CAB_COEFF_FLAG = IHEVC_CAB_CODED_SUBLK_IDX + 4, 95 IHEVC_CAB_COEFABS_GRTR1_FLAG = IHEVC_CAB_COEFF_FLAG + 42, 96 IHEVC_CAB_COEFABS_GRTR2_FLAG = IHEVC_CAB_COEFABS_GRTR1_FLAG + 24, 97 IHEVC_CAB_CTXT_END = IHEVC_CAB_COEFABS_GRTR2_FLAG + 6 98 }IHEVC_CABAC_CTXT_OFFSETS; 99 100 101 /*****************************************************************************/ 102 /* Extern global declarations */ 103 /*****************************************************************************/ 104 105 /** 106 ****************************************************************************** 107 * @brief Table for rangeTabLPS depending on pStateIdx and qCodIRangeIdx 108 * input : pStateIdx(0-63) and qCodIRangeIdx(0-3) [(Range >> 6) & 0x3] 109 * output : RLps 110 * 111 * @remarks See Table 9-40 of HEVC spec for rangeTabLPS 112 ******************************************************************************* 113 */ 114 extern const UWORD8 gau1_ihevc_cabac_rlps[64][4]; 115 116 117 /** 118 ****************************************************************************** 119 * @brief probaility+MPS state transition tables based on cur State and bin 120 * input : curpState[bits7-2] | curMPS[bit1] | decodedBin[bit0] 121 * output : nextpState[bits6-1] | nextMPS[bit0] 122 * @remarks Modified form of Table-9-41 State Transition table in HEVC spec 123 ****************************************************************************** 124 */ 125 extern const UWORD8 gau1_ihevc_next_state[128*2]; 126 127 /** 128 ****************************************************************************** 129 * @brief Init context tables for all combinations of qp and cabac_init_idc 130 * @remarks Packing format MPS in lsb and pState in bits[1-6] 131 ****************************************************************************** 132 */ 133 extern const UWORD8 gau1_ihevc_cab_ctxts[IHEVC_NUM_CAB_IDC][IHEVC_MAX_QP][IHEVC_CAB_CTXT_END]; 134 135 136 137 #endif /* _IHEVC_CABAC_TABLES_H_ */ 138