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 * @file 21 * ihevcd_intra_pred_mode_prediction.c.c 22 * 23 * @brief 24 * Contains functions for intra pred mode prediction 25 * 26 * @author 27 * Ittiam 28 * 29 * @par List of Functions: 30 * - ihevcd_intra_pred_mode_prediction() 31 * 32 * @remarks 33 * None 34 * 35 ******************************************************************************* 36 */ 37 /*****************************************************************************/ 38 /* File Includes */ 39 /*****************************************************************************/ 40 #include <stdio.h> 41 #include <stddef.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "ihevc_typedefs.h" 46 #include "iv.h" 47 #include "ivd.h" 48 #include "ihevcd_cxa.h" 49 50 #include "ihevc_defs.h" 51 #include "ihevc_debug.h" 52 #include "ihevc_structs.h" 53 #include "ihevc_macros.h" 54 #include "ihevc_mem_fns.h" 55 #include "ihevc_platform_macros.h" 56 57 #include "ihevcd_defs.h" 58 #include "ihevc_cabac_tables.h" 59 #include "ihevcd_function_selector.h" 60 #include "ihevcd_structs.h" 61 #include "ihevcd_error.h" 62 63 #include "ihevcd_bitstream.h" 64 65 66 /*****************************************************************************/ 67 /* Function Prototypes */ 68 /*****************************************************************************/ 69 70 /*****************************************************************************/ 71 /* Availability check is not done inside the function */ 72 /* Whenever the top and left are not available, it is assumed that Intra DC */ 73 /* mode will initialized in place of non available */ 74 /* neighbors */ 75 /*****************************************************************************/ 76 77 /** 78 ******************************************************************************* 79 * 80 * @brief Computes intra prediction mode for a CU 81 * 82 * @par Description 83 * Computes intra prediction mode for a CU 84 * 85 * @param[in,out] ps_cu 86 * Codic unit context 87 * 88 * @param[in] ps_parse 89 * parse context 90 * 91 * @param[in] ps_codec 92 * codec context 93 * 94 * @param[in] log2_cb_size 95 * log of cb size base 2 96 * 97 * @returns none 98 * 99 * @remarks 100 * Availability check is moved to CTB level. If the neighbors are 101 * not available or if the pred mode of neighbor is not MODE_INTRA, 102 * INTRA_DC mode will be updated in top and left buffers. 103 ******************************************************************************* 104 */ 105 void ihevcd_intra_pred_mode_prediction(codec_t *ps_codec, 106 WORD32 log2_cb_size, 107 WORD32 x0, 108 WORD32 y0) 109 { 110 WORD32 i, j, num_pred_blocks; 111 WORD32 available_l, available_t; 112 WORD32 cand_intra_pred_mode_l, cand_intra_pred_mode_t; 113 WORD32 cand_mode_list[3]; 114 WORD32 cb_size, block_offset_in_min_pu; 115 UWORD8 *pu1_luma_intra_pred_mode_top; 116 UWORD8 *pu1_luma_intra_pred_mode_left; 117 118 parse_ctxt_t *ps_parse = &ps_codec->s_parse; 119 parse_cu_t *ps_cu = &ps_codec->s_parse.s_cu; 120 sps_t *ps_sps = ps_parse->ps_sps; 121 122 123 available_t = 1; 124 available_l = 1; 125 /* i4_pos_x and i4_pos_y are in minCu units (8x8), convert them to 4x4 units by multiplying by 2 */ 126 pu1_luma_intra_pred_mode_top = ps_parse->pu1_luma_intra_pred_mode_top 127 + (ps_cu->i4_pos_x * 2); 128 129 pu1_luma_intra_pred_mode_left = ps_parse->pu1_luma_intra_pred_mode_left 130 + (ps_cu->i4_pos_y * 2); 131 132 /* 133 if(0 == ps_cu->i4_pos_y) 134 { 135 memset(pu1_luma_intra_pred_mode_top, INTRA_DC, 16); 136 } 137 138 if(0 == ps_cu->i4_pos_x) 139 { 140 memset(pu1_luma_intra_pred_mode_left, INTRA_DC, 16); 141 } 142 */ 143 if(ps_cu->i4_pos_y) 144 { 145 UWORD8 *pu1_pic_intra_flag = ps_codec->s_parse.pu1_pic_intra_flag; 146 WORD32 top_intra_flag; 147 148 WORD32 numbytes_row = (ps_sps->i2_pic_width_in_luma_samples + 63) / 64; 149 pu1_pic_intra_flag += ((y0 - 8) / 8) * numbytes_row; 150 pu1_pic_intra_flag += (x0 / 64); 151 top_intra_flag = *pu1_pic_intra_flag; 152 top_intra_flag &= (1 << ((x0 / 8) % 8)); 153 154 if(0 == top_intra_flag) 155 { 156 available_t = 0; 157 } 158 } 159 else 160 available_t = 0; 161 162 163 if((0 == ps_cu->i4_pos_x) && (((0 == ps_codec->s_parse.i4_ctb_slice_x) && (0 == ps_codec->s_parse.i4_ctb_slice_y)) || 164 (0 == ps_codec->s_parse.i4_ctb_tile_x))) 165 { 166 available_l = 0; 167 } 168 169 if(available_l) 170 { 171 UWORD8 *pu1_pic_intra_flag = ps_codec->s_parse.pu1_pic_intra_flag; 172 WORD32 left_intra_flag; 173 WORD32 numbytes_row = (ps_sps->i2_pic_width_in_luma_samples + 63) / 64; 174 pu1_pic_intra_flag += (y0 / 8) * numbytes_row; 175 pu1_pic_intra_flag += ((x0 - 8) / 64); 176 left_intra_flag = *pu1_pic_intra_flag; 177 left_intra_flag &= (1 << (((x0 - 8) / 8) % 8)); 178 179 if(0 == left_intra_flag) 180 { 181 available_l = 0; 182 } 183 } 184 185 cb_size = (1 << log2_cb_size); 186 187 block_offset_in_min_pu = (cb_size / 2) / MIN_PU_SIZE; 188 189 num_pred_blocks = (ps_cu->i4_part_mode == PART_NxN) ? 2 : 1; 190 191 for(i = 0; i < num_pred_blocks; i++) 192 { 193 WORD32 available_l_tmp; 194 available_l_tmp = available_l; 195 for(j = 0; j < num_pred_blocks; j++) 196 { 197 /* Computing Candidate intra pred mode left */ 198 { 199 WORD32 block_offset; 200 201 block_offset = i * block_offset_in_min_pu; 202 cand_intra_pred_mode_l = INTRA_DC; 203 if(available_l_tmp) 204 { 205 cand_intra_pred_mode_l = 206 pu1_luma_intra_pred_mode_left[block_offset]; 207 } 208 209 } 210 211 { 212 WORD32 block_offset; 213 block_offset = j * block_offset_in_min_pu; 214 cand_intra_pred_mode_t = INTRA_DC; 215 if(available_t) 216 { 217 cand_intra_pred_mode_t = 218 pu1_luma_intra_pred_mode_top[block_offset]; 219 } 220 } 221 222 /* Computing Candidate mode list */ 223 if(cand_intra_pred_mode_l == cand_intra_pred_mode_t) 224 { 225 if(cand_intra_pred_mode_l < 2) 226 { 227 cand_mode_list[0] = INTRA_PLANAR; 228 cand_mode_list[1] = INTRA_DC; 229 cand_mode_list[2] = INTRA_ANGULAR(26); /* angular 26 = Vertical */ 230 } 231 else 232 { 233 cand_mode_list[0] = cand_intra_pred_mode_l; 234 cand_mode_list[1] = 2 235 + ((cand_intra_pred_mode_l + 29) % 32); 236 cand_mode_list[2] = 2 237 + ((cand_intra_pred_mode_l - 2 + 1) % 32); 238 } 239 } 240 else 241 { 242 cand_mode_list[0] = cand_intra_pred_mode_l; 243 cand_mode_list[1] = cand_intra_pred_mode_t; 244 245 if((cand_intra_pred_mode_l != INTRA_PLANAR) 246 && (cand_intra_pred_mode_t != INTRA_PLANAR)) 247 { 248 cand_mode_list[2] = INTRA_PLANAR; 249 } 250 else if((cand_intra_pred_mode_l != INTRA_DC) 251 && (cand_intra_pred_mode_t != INTRA_DC)) 252 { 253 cand_mode_list[2] = INTRA_DC; 254 } 255 else 256 { 257 cand_mode_list[2] = INTRA_ANGULAR(26); 258 } 259 } 260 261 /* Computing Intra pred mode */ 262 if(ps_cu->ai4_prev_intra_luma_pred_flag[2 * i + j] == 1) 263 { 264 ps_cu->ai4_intra_luma_pred_mode[2 * i + j] = 265 cand_mode_list[ps_cu->ai4_mpm_idx[2 * i + j]]; 266 } 267 else 268 { 269 WORD32 intra_pred_mode; 270 /* Arranging cand_mode_list in increasing order */ 271 if(cand_mode_list[0] > cand_mode_list[1]) 272 { 273 SWAP(cand_mode_list[0], cand_mode_list[1]); 274 } 275 if(cand_mode_list[0] > cand_mode_list[2]) 276 { 277 SWAP(cand_mode_list[0], cand_mode_list[2]); 278 } 279 if(cand_mode_list[1] > cand_mode_list[2]) 280 { 281 SWAP(cand_mode_list[1], cand_mode_list[2]); 282 } 283 284 intra_pred_mode = ps_cu->ai4_rem_intra_luma_pred_mode[2 * i + j]; 285 286 if(intra_pred_mode >= cand_mode_list[0]) 287 intra_pred_mode++; 288 289 if(intra_pred_mode >= cand_mode_list[1]) 290 intra_pred_mode++; 291 292 if(intra_pred_mode >= cand_mode_list[2]) 293 intra_pred_mode++; 294 295 ps_cu->ai4_intra_luma_pred_mode[2 * i + j] = intra_pred_mode; 296 } 297 /* Update Top and Left intra pred mode */ 298 { 299 WORD32 intra_pred_mode; 300 301 intra_pred_mode = ps_cu->ai4_intra_luma_pred_mode[2 * i + j]; 302 303 ps_codec->s_func_selector.ihevc_memset_fptr(pu1_luma_intra_pred_mode_left + i * block_offset_in_min_pu, intra_pred_mode, (cb_size / num_pred_blocks) / MIN_PU_SIZE); 304 ps_codec->s_func_selector.ihevc_memset_fptr(pu1_luma_intra_pred_mode_top + j * block_offset_in_min_pu, intra_pred_mode, (cb_size / num_pred_blocks) / MIN_PU_SIZE); 305 306 } 307 /* If partition is PART_NxN, then left is available for second column always */ 308 available_l_tmp = 1; 309 310 } 311 /* If partition is PART_NxN, then top is available for bottom row always */ 312 available_t = 1; 313 } 314 315 /* In case it is PART_2Nx2N partition, replicate intra pred mode in other three entries */ 316 if(ps_cu->i4_part_mode == PART_2Nx2N) 317 { 318 ps_cu->ai4_intra_luma_pred_mode[1] = ps_cu->ai4_intra_luma_pred_mode[0]; 319 ps_cu->ai4_intra_luma_pred_mode[2] = ps_cu->ai4_intra_luma_pred_mode[0]; 320 ps_cu->ai4_intra_luma_pred_mode[3] = ps_cu->ai4_intra_luma_pred_mode[0]; 321 } 322 } 323 324
