1 /****************************************************************************** 2 * 3 * Copyright (C) 2015 The Android Open Source Project 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 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 21 /** 22 ******************************************************************************* 23 * @file 24 * ih264e_cabac_init.c 25 * 26 * @brief 27 * Contains all initialization functions for cabac contexts 28 * 29 * @author 30 * Doney Alex 31 * 32 * @par List of Functions: 33 * 34 * 35 * @remarks 36 * None 37 * 38 ******************************************************************************* 39 */ 40 41 /*****************************************************************************/ 42 /* File Includes */ 43 /*****************************************************************************/ 44 45 /* System include files */ 46 #include <stdio.h> 47 #include <stddef.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <limits.h> 51 #include <assert.h> 52 53 /* User include files */ 54 #include "ih264_typedefs.h" 55 #include "iv2.h" 56 #include "ive2.h" 57 #include "ih264_defs.h" 58 #include "ih264_debug.h" 59 #include "ime_distortion_metrics.h" 60 #include "ime_defs.h" 61 #include "ime_structs.h" 62 #include "ih264_error.h" 63 #include "ih264_structs.h" 64 #include "ih264_trans_quant_itrans_iquant.h" 65 #include "ih264_inter_pred_filters.h" 66 #include "ih264_mem_fns.h" 67 #include "ih264_padding.h" 68 #include "ih264_intra_pred_filters.h" 69 #include "ih264_deblk_edge_filters.h" 70 #include "ih264_platform_macros.h" 71 #include "ih264_macros.h" 72 #include "ih264_buf_mgr.h" 73 #include "ih264e_error.h" 74 #include "ih264e_bitstream.h" 75 #include "ih264_common_tables.h" 76 #include "ih264_cabac_tables.h" 77 #include "ih264_list.h" 78 #include "ih264e_defs.h" 79 #include "irc_cntrl_param.h" 80 #include "irc_frame_info_collector.h" 81 #include "ih264e_rate_control.h" 82 #include "ih264e_cabac_structs.h" 83 #include "ih264e_structs.h" 84 #include "ih264e_cabac.h" 85 #include "ih264e_process.h" 86 #include "ithread.h" 87 #include "ih264e_intra_modes_eval.h" 88 #include "ih264e_encode_header.h" 89 #include "ih264e_globals.h" 90 #include "ih264e_config.h" 91 #include "ih264e_trace.h" 92 #include "ih264e_statistics.h" 93 #include "ih264_cavlc_tables.h" 94 #include "ih264e_deblk.h" 95 #include "ih264e_me.h" 96 #include "ih264e_debug.h" 97 #include "ih264e_master.h" 98 #include "ih264e_utils.h" 99 #include "irc_mem_req_and_acq.h" 100 #include "irc_rate_control_api.h" 101 #include "ih264e_platform_macros.h" 102 #include "ime_statistics.h" 103 104 105 106 /*****************************************************************************/ 107 /* Function definitions . */ 108 /*****************************************************************************/ 109 110 /** 111 ******************************************************************************* 112 * 113 * @brief 114 * Initialize cabac encoding environment 115 * 116 * @param[in] ps_cab_enc_env 117 * Pointer to encoding_envirnoment_t structure 118 * 119 * @returns 120 * 121 * @remarks 122 * None 123 * 124 ******************************************************************************* 125 */ 126 static void ih264e_init_cabac_enc_envirnoment(encoding_envirnoment_t *ps_cab_enc_env) 127 { 128 ps_cab_enc_env->u4_code_int_low = 0; 129 ps_cab_enc_env->u4_code_int_range = 0x1fe; 130 ps_cab_enc_env->u4_out_standing_bytes = 0; 131 ps_cab_enc_env->u4_bits_gen = 0; 132 } 133 134 135 /** 136 ******************************************************************************* 137 * 138 * @brief 139 * Initialize default context values and pointers (Called once at the beginning of encoding). 140 * 141 * @param[in] ps_ent_ctxt 142 * Pointer to entropy context structure 143 * 144 * @returns 145 * 146 * @remarks 147 * None 148 * 149 ******************************************************************************* 150 */ 151 void ih264e_init_cabac_table(entropy_ctxt_t *ps_ent_ctxt) 152 { 153 /* CABAC context */ 154 cabac_ctxt_t *ps_cabac_ctxt = ps_ent_ctxt->ps_cabac; 155 ps_cabac_ctxt->ps_mb_map_ctxt_inc = ps_cabac_ctxt->ps_mb_map_ctxt_inc_base + 1; 156 ps_cabac_ctxt->ps_lft_csbp = &ps_cabac_ctxt->s_lft_csbp; 157 ps_cabac_ctxt->ps_bitstrm = ps_ent_ctxt->ps_bitstrm; 158 159 { 160 /* 0th entry of mb_map_ctxt_inc will be always be containing default values */ 161 /* for CABAC context representing MB not available */ 162 mb_info_ctxt_t *ps_def_ctxt = ps_cabac_ctxt->ps_mb_map_ctxt_inc - 1; 163 164 ps_def_ctxt->u1_mb_type = CAB_SKIP; 165 ps_def_ctxt->u1_cbp = 0x0f; 166 ps_def_ctxt->u1_intrapred_chroma_mode = 0; 167 168 memset(ps_def_ctxt->i1_ref_idx, 0, sizeof(ps_def_ctxt->i1_ref_idx)); 169 memset(ps_def_ctxt->u1_mv, 0, sizeof(ps_def_ctxt->u1_mv)); 170 ps_cabac_ctxt->ps_def_ctxt_mb_info = ps_def_ctxt; 171 } 172 } 173 174 175 /** 176 ******************************************************************************* 177 * 178 * @brief 179 * Initialize cabac context: Initialize all contest with init values given in the spec. 180 * Called at the beginning of entropy coding of each slice for CABAC encoding. 181 * 182 * @param[in] ps_ent_ctxt 183 * Pointer to entropy context structure 184 * 185 * @returns 186 * 187 * @remarks 188 * None 189 * 190 ******************************************************************************* 191 */ 192 void ih264e_init_cabac_ctxt(entropy_ctxt_t *ps_ent_ctxt) 193 { 194 /* CABAC context */ 195 cabac_ctxt_t *ps_cabac_ctxt = ps_ent_ctxt->ps_cabac; 196 197 /* slice header */ 198 slice_header_t *ps_slice_hdr = ps_ent_ctxt->ps_slice_hdr_base; 199 const UWORD8 u1_slice_type = ps_slice_hdr->u1_slice_type; 200 WORD8 i1_cabac_init_idc = 0; 201 bin_ctxt_model *au1_cabac_ctxt_table = ps_cabac_ctxt->au1_cabac_ctxt_table; 202 UWORD8 u1_qp_y = ps_slice_hdr->i1_slice_qp; 203 204 ih264e_init_cabac_enc_envirnoment(&ps_cabac_ctxt->s_cab_enc_env); 205 206 ps_cabac_ctxt->i1_prevps_mb_qp_delta_ctxt = 0; 207 208 if (ISLICE != u1_slice_type) 209 { 210 i1_cabac_init_idc = ps_slice_hdr->i1_cabac_init_idc; 211 } 212 else 213 { 214 i1_cabac_init_idc = 3; 215 216 } 217 218 memcpy(au1_cabac_ctxt_table, 219 gau1_ih264_cabac_ctxt_init_table[i1_cabac_init_idc][u1_qp_y], 220 NUM_CABAC_CTXTS * sizeof(bin_ctxt_model)); 221 222 } 223
