| 1 | /* |
| 2 | * HEVC CABAC decoding |
| 3 | * |
| 4 | * Copyright (C) 2012 - 2013 Guillaume Martres |
| 5 | * Copyright (C) 2012 - 2013 Gildas Cocherel |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #include "libavutil/attributes.h" |
| 25 | #include "libavutil/common.h" |
| 26 | |
| 27 | #include "cabac_functions.h" |
| 28 | #include "hevc.h" |
| 29 | |
| 30 | #define CABAC_MAX_BIN 31 |
| 31 | |
| 32 | /** |
| 33 | * number of bin by SyntaxElement. |
| 34 | */ |
| 35 | av_unused static const int8_t num_bins_in_se[] = { |
| 36 | 1, // sao_merge_flag |
| 37 | 1, // sao_type_idx |
| 38 | 0, // sao_eo_class |
| 39 | 0, // sao_band_position |
| 40 | 0, // sao_offset_abs |
| 41 | 0, // sao_offset_sign |
| 42 | 0, // end_of_slice_flag |
| 43 | 3, // split_coding_unit_flag |
| 44 | 1, // cu_transquant_bypass_flag |
| 45 | 3, // skip_flag |
| 46 | 3, // cu_qp_delta |
| 47 | 1, // pred_mode |
| 48 | 4, // part_mode |
| 49 | 0, // pcm_flag |
| 50 | 1, // prev_intra_luma_pred_mode |
| 51 | 0, // mpm_idx |
| 52 | 0, // rem_intra_luma_pred_mode |
| 53 | 2, // intra_chroma_pred_mode |
| 54 | 1, // merge_flag |
| 55 | 1, // merge_idx |
| 56 | 5, // inter_pred_idc |
| 57 | 2, // ref_idx_l0 |
| 58 | 2, // ref_idx_l1 |
| 59 | 2, // abs_mvd_greater0_flag |
| 60 | 2, // abs_mvd_greater1_flag |
| 61 | 0, // abs_mvd_minus2 |
| 62 | 0, // mvd_sign_flag |
| 63 | 1, // mvp_lx_flag |
| 64 | 1, // no_residual_data_flag |
| 65 | 3, // split_transform_flag |
| 66 | 2, // cbf_luma |
| 67 | 4, // cbf_cb, cbf_cr |
| 68 | 2, // transform_skip_flag[][] |
| 69 | 2, // explicit_rdpcm_flag[][] |
| 70 | 2, // explicit_rdpcm_dir_flag[][] |
| 71 | 18, // last_significant_coeff_x_prefix |
| 72 | 18, // last_significant_coeff_y_prefix |
| 73 | 0, // last_significant_coeff_x_suffix |
| 74 | 0, // last_significant_coeff_y_suffix |
| 75 | 4, // significant_coeff_group_flag |
| 76 | 44, // significant_coeff_flag |
| 77 | 24, // coeff_abs_level_greater1_flag |
| 78 | 6, // coeff_abs_level_greater2_flag |
| 79 | 0, // coeff_abs_level_remaining |
| 80 | 0, // coeff_sign_flag |
| 81 | 8, // log2_res_scale_abs |
| 82 | 2, // res_scale_sign_flag |
| 83 | 1, // cu_chroma_qp_offset_flag |
| 84 | 1, // cu_chroma_qp_offset_idx |
| 85 | }; |
| 86 | |
| 87 | /** |
| 88 | * Offset to ctxIdx 0 in init_values and states, indexed by SyntaxElement. |
| 89 | */ |
| 90 | static const int elem_offset[sizeof(num_bins_in_se)] = { |
| 91 | 0, // sao_merge_flag |
| 92 | 1, // sao_type_idx |
| 93 | 2, // sao_eo_class |
| 94 | 2, // sao_band_position |
| 95 | 2, // sao_offset_abs |
| 96 | 2, // sao_offset_sign |
| 97 | 2, // end_of_slice_flag |
| 98 | 2, // split_coding_unit_flag |
| 99 | 5, // cu_transquant_bypass_flag |
| 100 | 6, // skip_flag |
| 101 | 9, // cu_qp_delta |
| 102 | 12, // pred_mode |
| 103 | 13, // part_mode |
| 104 | 17, // pcm_flag |
| 105 | 17, // prev_intra_luma_pred_mode |
| 106 | 18, // mpm_idx |
| 107 | 18, // rem_intra_luma_pred_mode |
| 108 | 18, // intra_chroma_pred_mode |
| 109 | 20, // merge_flag |
| 110 | 21, // merge_idx |
| 111 | 22, // inter_pred_idc |
| 112 | 27, // ref_idx_l0 |
| 113 | 29, // ref_idx_l1 |
| 114 | 31, // abs_mvd_greater0_flag |
| 115 | 33, // abs_mvd_greater1_flag |
| 116 | 35, // abs_mvd_minus2 |
| 117 | 35, // mvd_sign_flag |
| 118 | 35, // mvp_lx_flag |
| 119 | 36, // no_residual_data_flag |
| 120 | 37, // split_transform_flag |
| 121 | 40, // cbf_luma |
| 122 | 42, // cbf_cb, cbf_cr |
| 123 | 46, // transform_skip_flag[][] |
| 124 | 48, // explicit_rdpcm_flag[][] |
| 125 | 50, // explicit_rdpcm_dir_flag[][] |
| 126 | 52, // last_significant_coeff_x_prefix |
| 127 | 70, // last_significant_coeff_y_prefix |
| 128 | 88, // last_significant_coeff_x_suffix |
| 129 | 88, // last_significant_coeff_y_suffix |
| 130 | 88, // significant_coeff_group_flag |
| 131 | 92, // significant_coeff_flag |
| 132 | 136, // coeff_abs_level_greater1_flag |
| 133 | 160, // coeff_abs_level_greater2_flag |
| 134 | 166, // coeff_abs_level_remaining |
| 135 | 166, // coeff_sign_flag |
| 136 | 166, // log2_res_scale_abs |
| 137 | 174, // res_scale_sign_flag |
| 138 | 176, // cu_chroma_qp_offset_flag |
| 139 | 177, // cu_chroma_qp_offset_idx |
| 140 | }; |
| 141 | |
| 142 | #define CNU 154 |
| 143 | /** |
| 144 | * Indexed by init_type |
| 145 | */ |
| 146 | static const uint8_t init_values[3][HEVC_CONTEXTS] = { |
| 147 | { // sao_merge_flag |
| 148 | 153, |
| 149 | // sao_type_idx |
| 150 | 200, |
| 151 | // split_coding_unit_flag |
| 152 | 139, 141, 157, |
| 153 | // cu_transquant_bypass_flag |
| 154 | 154, |
| 155 | // skip_flag |
| 156 | CNU, CNU, CNU, |
| 157 | // cu_qp_delta |
| 158 | 154, 154, 154, |
| 159 | // pred_mode |
| 160 | CNU, |
| 161 | // part_mode |
| 162 | 184, CNU, CNU, CNU, |
| 163 | // prev_intra_luma_pred_mode |
| 164 | 184, |
| 165 | // intra_chroma_pred_mode |
| 166 | 63, 139, |
| 167 | // merge_flag |
| 168 | CNU, |
| 169 | // merge_idx |
| 170 | CNU, |
| 171 | // inter_pred_idc |
| 172 | CNU, CNU, CNU, CNU, CNU, |
| 173 | // ref_idx_l0 |
| 174 | CNU, CNU, |
| 175 | // ref_idx_l1 |
| 176 | CNU, CNU, |
| 177 | // abs_mvd_greater1_flag |
| 178 | CNU, CNU, |
| 179 | // abs_mvd_greater1_flag |
| 180 | CNU, CNU, |
| 181 | // mvp_lx_flag |
| 182 | CNU, |
| 183 | // no_residual_data_flag |
| 184 | CNU, |
| 185 | // split_transform_flag |
| 186 | 153, 138, 138, |
| 187 | // cbf_luma |
| 188 | 111, 141, |
| 189 | // cbf_cb, cbf_cr |
| 190 | 94, 138, 182, 154, |
| 191 | // transform_skip_flag |
| 192 | 139, 139, |
| 193 | // explicit_rdpcm_flag |
| 194 | 139, 139, |
| 195 | // explicit_rdpcm_dir_flag |
| 196 | 139, 139, |
| 197 | // last_significant_coeff_x_prefix |
| 198 | 110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111, |
| 199 | 79, 108, 123, 63, |
| 200 | // last_significant_coeff_y_prefix |
| 201 | 110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111, |
| 202 | 79, 108, 123, 63, |
| 203 | // significant_coeff_group_flag |
| 204 | 91, 171, 134, 141, |
| 205 | // significant_coeff_flag |
| 206 | 111, 111, 125, 110, 110, 94, 124, 108, 124, 107, 125, 141, 179, 153, |
| 207 | 125, 107, 125, 141, 179, 153, 125, 107, 125, 141, 179, 153, 125, 140, |
| 208 | 139, 182, 182, 152, 136, 152, 136, 153, 136, 139, 111, 136, 139, 111, |
| 209 | 141, 111, |
| 210 | // coeff_abs_level_greater1_flag |
| 211 | 140, 92, 137, 138, 140, 152, 138, 139, 153, 74, 149, 92, 139, 107, |
| 212 | 122, 152, 140, 179, 166, 182, 140, 227, 122, 197, |
| 213 | // coeff_abs_level_greater2_flag |
| 214 | 138, 153, 136, 167, 152, 152, |
| 215 | // log2_res_scale_abs |
| 216 | 154, 154, 154, 154, 154, 154, 154, 154, |
| 217 | // res_scale_sign_flag |
| 218 | 154, 154, |
| 219 | // cu_chroma_qp_offset_flag |
| 220 | 154, |
| 221 | // cu_chroma_qp_offset_idx |
| 222 | 154, |
| 223 | }, |
| 224 | { // sao_merge_flag |
| 225 | 153, |
| 226 | // sao_type_idx |
| 227 | 185, |
| 228 | // split_coding_unit_flag |
| 229 | 107, 139, 126, |
| 230 | // cu_transquant_bypass_flag |
| 231 | 154, |
| 232 | // skip_flag |
| 233 | 197, 185, 201, |
| 234 | // cu_qp_delta |
| 235 | 154, 154, 154, |
| 236 | // pred_mode |
| 237 | 149, |
| 238 | // part_mode |
| 239 | 154, 139, 154, 154, |
| 240 | // prev_intra_luma_pred_mode |
| 241 | 154, |
| 242 | // intra_chroma_pred_mode |
| 243 | 152, 139, |
| 244 | // merge_flag |
| 245 | 110, |
| 246 | // merge_idx |
| 247 | 122, |
| 248 | // inter_pred_idc |
| 249 | 95, 79, 63, 31, 31, |
| 250 | // ref_idx_l0 |
| 251 | 153, 153, |
| 252 | // ref_idx_l1 |
| 253 | 153, 153, |
| 254 | // abs_mvd_greater1_flag |
| 255 | 140, 198, |
| 256 | // abs_mvd_greater1_flag |
| 257 | 140, 198, |
| 258 | // mvp_lx_flag |
| 259 | 168, |
| 260 | // no_residual_data_flag |
| 261 | 79, |
| 262 | // split_transform_flag |
| 263 | 124, 138, 94, |
| 264 | // cbf_luma |
| 265 | 153, 111, |
| 266 | // cbf_cb, cbf_cr |
| 267 | 149, 107, 167, 154, |
| 268 | // transform_skip_flag |
| 269 | 139, 139, |
| 270 | // explicit_rdpcm_flag |
| 271 | 139, 139, |
| 272 | // explicit_rdpcm_dir_flag |
| 273 | 139, 139, |
| 274 | // last_significant_coeff_x_prefix |
| 275 | 125, 110, 94, 110, 95, 79, 125, 111, 110, 78, 110, 111, 111, 95, |
| 276 | 94, 108, 123, 108, |
| 277 | // last_significant_coeff_y_prefix |
| 278 | 125, 110, 94, 110, 95, 79, 125, 111, 110, 78, 110, 111, 111, 95, |
| 279 | 94, 108, 123, 108, |
| 280 | // significant_coeff_group_flag |
| 281 | 121, 140, 61, 154, |
| 282 | // significant_coeff_flag |
| 283 | 155, 154, 139, 153, 139, 123, 123, 63, 153, 166, 183, 140, 136, 153, |
| 284 | 154, 166, 183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170, |
| 285 | 153, 123, 123, 107, 121, 107, 121, 167, 151, 183, 140, 151, 183, 140, |
| 286 | 140, 140, |
| 287 | // coeff_abs_level_greater1_flag |
| 288 | 154, 196, 196, 167, 154, 152, 167, 182, 182, 134, 149, 136, 153, 121, |
| 289 | 136, 137, 169, 194, 166, 167, 154, 167, 137, 182, |
| 290 | // coeff_abs_level_greater2_flag |
| 291 | 107, 167, 91, 122, 107, 167, |
| 292 | // log2_res_scale_abs |
| 293 | 154, 154, 154, 154, 154, 154, 154, 154, |
| 294 | // res_scale_sign_flag |
| 295 | 154, 154, |
| 296 | // cu_chroma_qp_offset_flag |
| 297 | 154, |
| 298 | // cu_chroma_qp_offset_idx |
| 299 | 154, |
| 300 | }, |
| 301 | { // sao_merge_flag |
| 302 | 153, |
| 303 | // sao_type_idx |
| 304 | 160, |
| 305 | // split_coding_unit_flag |
| 306 | 107, 139, 126, |
| 307 | // cu_transquant_bypass_flag |
| 308 | 154, |
| 309 | // skip_flag |
| 310 | 197, 185, 201, |
| 311 | // cu_qp_delta |
| 312 | 154, 154, 154, |
| 313 | // pred_mode |
| 314 | 134, |
| 315 | // part_mode |
| 316 | 154, 139, 154, 154, |
| 317 | // prev_intra_luma_pred_mode |
| 318 | 183, |
| 319 | // intra_chroma_pred_mode |
| 320 | 152, 139, |
| 321 | // merge_flag |
| 322 | 154, |
| 323 | // merge_idx |
| 324 | 137, |
| 325 | // inter_pred_idc |
| 326 | 95, 79, 63, 31, 31, |
| 327 | // ref_idx_l0 |
| 328 | 153, 153, |
| 329 | // ref_idx_l1 |
| 330 | 153, 153, |
| 331 | // abs_mvd_greater1_flag |
| 332 | 169, 198, |
| 333 | // abs_mvd_greater1_flag |
| 334 | 169, 198, |
| 335 | // mvp_lx_flag |
| 336 | 168, |
| 337 | // no_residual_data_flag |
| 338 | 79, |
| 339 | // split_transform_flag |
| 340 | 224, 167, 122, |
| 341 | // cbf_luma |
| 342 | 153, 111, |
| 343 | // cbf_cb, cbf_cr |
| 344 | 149, 92, 167, 154, |
| 345 | // transform_skip_flag |
| 346 | 139, 139, |
| 347 | // explicit_rdpcm_flag |
| 348 | 139, 139, |
| 349 | // explicit_rdpcm_dir_flag |
| 350 | 139, 139, |
| 351 | // last_significant_coeff_x_prefix |
| 352 | 125, 110, 124, 110, 95, 94, 125, 111, 111, 79, 125, 126, 111, 111, |
| 353 | 79, 108, 123, 93, |
| 354 | // last_significant_coeff_y_prefix |
| 355 | 125, 110, 124, 110, 95, 94, 125, 111, 111, 79, 125, 126, 111, 111, |
| 356 | 79, 108, 123, 93, |
| 357 | // significant_coeff_group_flag |
| 358 | 121, 140, 61, 154, |
| 359 | // significant_coeff_flag |
| 360 | 170, 154, 139, 153, 139, 123, 123, 63, 124, 166, 183, 140, 136, 153, |
| 361 | 154, 166, 183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170, |
| 362 | 153, 138, 138, 122, 121, 122, 121, 167, 151, 183, 140, 151, 183, 140, |
| 363 | 140, 140, |
| 364 | // coeff_abs_level_greater1_flag |
| 365 | 154, 196, 167, 167, 154, 152, 167, 182, 182, 134, 149, 136, 153, 121, |
| 366 | 136, 122, 169, 208, 166, 167, 154, 152, 167, 182, |
| 367 | // coeff_abs_level_greater2_flag |
| 368 | 107, 167, 91, 107, 107, 167, |
| 369 | // log2_res_scale_abs |
| 370 | 154, 154, 154, 154, 154, 154, 154, 154, |
| 371 | // res_scale_sign_flag |
| 372 | 154, 154, |
| 373 | // cu_chroma_qp_offset_flag |
| 374 | 154, |
| 375 | // cu_chroma_qp_offset_idx |
| 376 | 154, |
| 377 | }, |
| 378 | }; |
| 379 | |
| 380 | static const uint8_t scan_1x1[1] = { |
| 381 | 0, |
| 382 | }; |
| 383 | |
| 384 | static const uint8_t horiz_scan2x2_x[4] = { |
| 385 | 0, 1, 0, 1, |
| 386 | }; |
| 387 | |
| 388 | static const uint8_t horiz_scan2x2_y[4] = { |
| 389 | 0, 0, 1, 1 |
| 390 | }; |
| 391 | |
| 392 | static const uint8_t horiz_scan4x4_x[16] = { |
| 393 | 0, 1, 2, 3, |
| 394 | 0, 1, 2, 3, |
| 395 | 0, 1, 2, 3, |
| 396 | 0, 1, 2, 3, |
| 397 | }; |
| 398 | |
| 399 | static const uint8_t horiz_scan4x4_y[16] = { |
| 400 | 0, 0, 0, 0, |
| 401 | 1, 1, 1, 1, |
| 402 | 2, 2, 2, 2, |
| 403 | 3, 3, 3, 3, |
| 404 | }; |
| 405 | |
| 406 | static const uint8_t horiz_scan8x8_inv[8][8] = { |
| 407 | { 0, 1, 2, 3, 16, 17, 18, 19, }, |
| 408 | { 4, 5, 6, 7, 20, 21, 22, 23, }, |
| 409 | { 8, 9, 10, 11, 24, 25, 26, 27, }, |
| 410 | { 12, 13, 14, 15, 28, 29, 30, 31, }, |
| 411 | { 32, 33, 34, 35, 48, 49, 50, 51, }, |
| 412 | { 36, 37, 38, 39, 52, 53, 54, 55, }, |
| 413 | { 40, 41, 42, 43, 56, 57, 58, 59, }, |
| 414 | { 44, 45, 46, 47, 60, 61, 62, 63, }, |
| 415 | }; |
| 416 | |
| 417 | static const uint8_t diag_scan2x2_x[4] = { |
| 418 | 0, 0, 1, 1, |
| 419 | }; |
| 420 | |
| 421 | static const uint8_t diag_scan2x2_y[4] = { |
| 422 | 0, 1, 0, 1, |
| 423 | }; |
| 424 | |
| 425 | static const uint8_t diag_scan2x2_inv[2][2] = { |
| 426 | { 0, 2, }, |
| 427 | { 1, 3, }, |
| 428 | }; |
| 429 | |
| 430 | const uint8_t ff_hevc_diag_scan4x4_x[16] = { |
| 431 | 0, 0, 1, 0, |
| 432 | 1, 2, 0, 1, |
| 433 | 2, 3, 1, 2, |
| 434 | 3, 2, 3, 3, |
| 435 | }; |
| 436 | |
| 437 | const uint8_t ff_hevc_diag_scan4x4_y[16] = { |
| 438 | 0, 1, 0, 2, |
| 439 | 1, 0, 3, 2, |
| 440 | 1, 0, 3, 2, |
| 441 | 1, 3, 2, 3, |
| 442 | }; |
| 443 | |
| 444 | static const uint8_t diag_scan4x4_inv[4][4] = { |
| 445 | { 0, 2, 5, 9, }, |
| 446 | { 1, 4, 8, 12, }, |
| 447 | { 3, 7, 11, 14, }, |
| 448 | { 6, 10, 13, 15, }, |
| 449 | }; |
| 450 | |
| 451 | const uint8_t ff_hevc_diag_scan8x8_x[64] = { |
| 452 | 0, 0, 1, 0, |
| 453 | 1, 2, 0, 1, |
| 454 | 2, 3, 0, 1, |
| 455 | 2, 3, 4, 0, |
| 456 | 1, 2, 3, 4, |
| 457 | 5, 0, 1, 2, |
| 458 | 3, 4, 5, 6, |
| 459 | 0, 1, 2, 3, |
| 460 | 4, 5, 6, 7, |
| 461 | 1, 2, 3, 4, |
| 462 | 5, 6, 7, 2, |
| 463 | 3, 4, 5, 6, |
| 464 | 7, 3, 4, 5, |
| 465 | 6, 7, 4, 5, |
| 466 | 6, 7, 5, 6, |
| 467 | 7, 6, 7, 7, |
| 468 | }; |
| 469 | |
| 470 | const uint8_t ff_hevc_diag_scan8x8_y[64] = { |
| 471 | 0, 1, 0, 2, |
| 472 | 1, 0, 3, 2, |
| 473 | 1, 0, 4, 3, |
| 474 | 2, 1, 0, 5, |
| 475 | 4, 3, 2, 1, |
| 476 | 0, 6, 5, 4, |
| 477 | 3, 2, 1, 0, |
| 478 | 7, 6, 5, 4, |
| 479 | 3, 2, 1, 0, |
| 480 | 7, 6, 5, 4, |
| 481 | 3, 2, 1, 7, |
| 482 | 6, 5, 4, 3, |
| 483 | 2, 7, 6, 5, |
| 484 | 4, 3, 7, 6, |
| 485 | 5, 4, 7, 6, |
| 486 | 5, 7, 6, 7, |
| 487 | }; |
| 488 | |
| 489 | static const uint8_t diag_scan8x8_inv[8][8] = { |
| 490 | { 0, 2, 5, 9, 14, 20, 27, 35, }, |
| 491 | { 1, 4, 8, 13, 19, 26, 34, 42, }, |
| 492 | { 3, 7, 12, 18, 25, 33, 41, 48, }, |
| 493 | { 6, 11, 17, 24, 32, 40, 47, 53, }, |
| 494 | { 10, 16, 23, 31, 39, 46, 52, 57, }, |
| 495 | { 15, 22, 30, 38, 45, 51, 56, 60, }, |
| 496 | { 21, 29, 37, 44, 50, 55, 59, 62, }, |
| 497 | { 28, 36, 43, 49, 54, 58, 61, 63, }, |
| 498 | }; |
| 499 | |
| 500 | void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts) |
| 501 | { |
| 502 | if (s->pps->entropy_coding_sync_enabled_flag && |
| 503 | (ctb_addr_ts % s->sps->ctb_width == 2 || |
| 504 | (s->sps->ctb_width == 2 && |
| 505 | ctb_addr_ts % s->sps->ctb_width == 0))) { |
| 506 | memcpy(s->cabac_state, s->HEVClc->cabac_state, HEVC_CONTEXTS); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | static void load_states(HEVCContext *s) |
| 511 | { |
| 512 | memcpy(s->HEVClc->cabac_state, s->cabac_state, HEVC_CONTEXTS); |
| 513 | } |
| 514 | |
| 515 | static void cabac_reinit(HEVCLocalContext *lc) |
| 516 | { |
| 517 | skip_bytes(&lc->cc, 0); |
| 518 | } |
| 519 | |
| 520 | static void cabac_init_decoder(HEVCContext *s) |
| 521 | { |
| 522 | GetBitContext *gb = &s->HEVClc->gb; |
| 523 | skip_bits(gb, 1); |
| 524 | align_get_bits(gb); |
| 525 | ff_init_cabac_decoder(&s->HEVClc->cc, |
| 526 | gb->buffer + get_bits_count(gb) / 8, |
| 527 | (get_bits_left(gb) + 7) / 8); |
| 528 | } |
| 529 | |
| 530 | static void cabac_init_state(HEVCContext *s) |
| 531 | { |
| 532 | int init_type = 2 - s->sh.slice_type; |
| 533 | int i; |
| 534 | |
| 535 | if (s->sh.cabac_init_flag && s->sh.slice_type != I_SLICE) |
| 536 | init_type ^= 3; |
| 537 | |
| 538 | for (i = 0; i < HEVC_CONTEXTS; i++) { |
| 539 | int init_value = init_values[init_type][i]; |
| 540 | int m = (init_value >> 4) * 5 - 45; |
| 541 | int n = ((init_value & 15) << 3) - 16; |
| 542 | int pre = 2 * (((m * av_clip(s->sh.slice_qp, 0, 51)) >> 4) + n) - 127; |
| 543 | |
| 544 | pre ^= pre >> 31; |
| 545 | if (pre > 124) |
| 546 | pre = 124 + (pre & 1); |
| 547 | s->HEVClc->cabac_state[i] = pre; |
| 548 | } |
| 549 | |
| 550 | for (i = 0; i < 4; i++) |
| 551 | s->HEVClc->stat_coeff[i] = 0; |
| 552 | } |
| 553 | |
| 554 | void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts) |
| 555 | { |
| 556 | if (ctb_addr_ts == s->pps->ctb_addr_rs_to_ts[s->sh.slice_ctb_addr_rs]) { |
| 557 | cabac_init_decoder(s); |
| 558 | if (s->sh.dependent_slice_segment_flag == 0 || |
| 559 | (s->pps->tiles_enabled_flag && |
| 560 | s->pps->tile_id[ctb_addr_ts] != s->pps->tile_id[ctb_addr_ts - 1])) |
| 561 | cabac_init_state(s); |
| 562 | |
| 563 | if (!s->sh.first_slice_in_pic_flag && |
| 564 | s->pps->entropy_coding_sync_enabled_flag) { |
| 565 | if (ctb_addr_ts % s->sps->ctb_width == 0) { |
| 566 | if (s->sps->ctb_width == 1) |
| 567 | cabac_init_state(s); |
| 568 | else if (s->sh.dependent_slice_segment_flag == 1) |
| 569 | load_states(s); |
| 570 | } |
| 571 | } |
| 572 | } else { |
| 573 | if (s->pps->tiles_enabled_flag && |
| 574 | s->pps->tile_id[ctb_addr_ts] != s->pps->tile_id[ctb_addr_ts - 1]) { |
| 575 | if (s->threads_number == 1) |
| 576 | cabac_reinit(s->HEVClc); |
| 577 | else |
| 578 | cabac_init_decoder(s); |
| 579 | cabac_init_state(s); |
| 580 | } |
| 581 | if (s->pps->entropy_coding_sync_enabled_flag) { |
| 582 | if (ctb_addr_ts % s->sps->ctb_width == 0) { |
| 583 | get_cabac_terminate(&s->HEVClc->cc); |
| 584 | if (s->threads_number == 1) |
| 585 | cabac_reinit(s->HEVClc); |
| 586 | else |
| 587 | cabac_init_decoder(s); |
| 588 | |
| 589 | if (s->sps->ctb_width == 1) |
| 590 | cabac_init_state(s); |
| 591 | else |
| 592 | load_states(s); |
| 593 | } |
| 594 | } |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | #define GET_CABAC(ctx) get_cabac(&s->HEVClc->cc, &s->HEVClc->cabac_state[ctx]) |
| 599 | |
| 600 | int ff_hevc_sao_merge_flag_decode(HEVCContext *s) |
| 601 | { |
| 602 | return GET_CABAC(elem_offset[SAO_MERGE_FLAG]); |
| 603 | } |
| 604 | |
| 605 | int ff_hevc_sao_type_idx_decode(HEVCContext *s) |
| 606 | { |
| 607 | if (!GET_CABAC(elem_offset[SAO_TYPE_IDX])) |
| 608 | return 0; |
| 609 | |
| 610 | if (!get_cabac_bypass(&s->HEVClc->cc)) |
| 611 | return SAO_BAND; |
| 612 | return SAO_EDGE; |
| 613 | } |
| 614 | |
| 615 | int ff_hevc_sao_band_position_decode(HEVCContext *s) |
| 616 | { |
| 617 | int i; |
| 618 | int value = get_cabac_bypass(&s->HEVClc->cc); |
| 619 | |
| 620 | for (i = 0; i < 4; i++) |
| 621 | value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc); |
| 622 | return value; |
| 623 | } |
| 624 | |
| 625 | int ff_hevc_sao_offset_abs_decode(HEVCContext *s) |
| 626 | { |
| 627 | int i = 0; |
| 628 | int length = (1 << (FFMIN(s->sps->bit_depth, 10) - 5)) - 1; |
| 629 | |
| 630 | while (i < length && get_cabac_bypass(&s->HEVClc->cc)) |
| 631 | i++; |
| 632 | return i; |
| 633 | } |
| 634 | |
| 635 | int ff_hevc_sao_offset_sign_decode(HEVCContext *s) |
| 636 | { |
| 637 | return get_cabac_bypass(&s->HEVClc->cc); |
| 638 | } |
| 639 | |
| 640 | int ff_hevc_sao_eo_class_decode(HEVCContext *s) |
| 641 | { |
| 642 | int ret = get_cabac_bypass(&s->HEVClc->cc) << 1; |
| 643 | ret |= get_cabac_bypass(&s->HEVClc->cc); |
| 644 | return ret; |
| 645 | } |
| 646 | |
| 647 | int ff_hevc_end_of_slice_flag_decode(HEVCContext *s) |
| 648 | { |
| 649 | return get_cabac_terminate(&s->HEVClc->cc); |
| 650 | } |
| 651 | |
| 652 | int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s) |
| 653 | { |
| 654 | return GET_CABAC(elem_offset[CU_TRANSQUANT_BYPASS_FLAG]); |
| 655 | } |
| 656 | |
| 657 | int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0, int x_cb, int y_cb) |
| 658 | { |
| 659 | int min_cb_width = s->sps->min_cb_width; |
| 660 | int inc = 0; |
| 661 | int x0b = x0 & ((1 << s->sps->log2_ctb_size) - 1); |
| 662 | int y0b = y0 & ((1 << s->sps->log2_ctb_size) - 1); |
| 663 | |
| 664 | if (s->HEVClc->ctb_left_flag || x0b) |
| 665 | inc = !!SAMPLE_CTB(s->skip_flag, x_cb - 1, y_cb); |
| 666 | if (s->HEVClc->ctb_up_flag || y0b) |
| 667 | inc += !!SAMPLE_CTB(s->skip_flag, x_cb, y_cb - 1); |
| 668 | |
| 669 | return GET_CABAC(elem_offset[SKIP_FLAG] + inc); |
| 670 | } |
| 671 | |
| 672 | int ff_hevc_cu_qp_delta_abs(HEVCContext *s) |
| 673 | { |
| 674 | int prefix_val = 0; |
| 675 | int suffix_val = 0; |
| 676 | int inc = 0; |
| 677 | |
| 678 | while (prefix_val < 5 && GET_CABAC(elem_offset[CU_QP_DELTA] + inc)) { |
| 679 | prefix_val++; |
| 680 | inc = 1; |
| 681 | } |
| 682 | if (prefix_val >= 5) { |
| 683 | int k = 0; |
| 684 | while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) { |
| 685 | suffix_val += 1 << k; |
| 686 | k++; |
| 687 | } |
| 688 | if (k == CABAC_MAX_BIN) |
| 689 | av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k); |
| 690 | |
| 691 | while (k--) |
| 692 | suffix_val += get_cabac_bypass(&s->HEVClc->cc) << k; |
| 693 | } |
| 694 | return prefix_val + suffix_val; |
| 695 | } |
| 696 | |
| 697 | int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s) |
| 698 | { |
| 699 | return get_cabac_bypass(&s->HEVClc->cc); |
| 700 | } |
| 701 | |
| 702 | int ff_hevc_cu_chroma_qp_offset_flag(HEVCContext *s) |
| 703 | { |
| 704 | return GET_CABAC(elem_offset[CU_CHROMA_QP_OFFSET_FLAG]); |
| 705 | } |
| 706 | |
| 707 | int ff_hevc_cu_chroma_qp_offset_idx(HEVCContext *s) |
| 708 | { |
| 709 | int c_max= FFMAX(5, s->pps->chroma_qp_offset_list_len_minus1); |
| 710 | int i = 0; |
| 711 | |
| 712 | while (i < c_max && GET_CABAC(elem_offset[CU_CHROMA_QP_OFFSET_IDX])) |
| 713 | i++; |
| 714 | |
| 715 | return i; |
| 716 | } |
| 717 | |
| 718 | int ff_hevc_pred_mode_decode(HEVCContext *s) |
| 719 | { |
| 720 | return GET_CABAC(elem_offset[PRED_MODE_FLAG]); |
| 721 | } |
| 722 | |
| 723 | int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth, int x0, int y0) |
| 724 | { |
| 725 | int inc = 0, depth_left = 0, depth_top = 0; |
| 726 | int x0b = x0 & ((1 << s->sps->log2_ctb_size) - 1); |
| 727 | int y0b = y0 & ((1 << s->sps->log2_ctb_size) - 1); |
| 728 | int x_cb = x0 >> s->sps->log2_min_cb_size; |
| 729 | int y_cb = y0 >> s->sps->log2_min_cb_size; |
| 730 | |
| 731 | if (s->HEVClc->ctb_left_flag || x0b) |
| 732 | depth_left = s->tab_ct_depth[(y_cb) * s->sps->min_cb_width + x_cb - 1]; |
| 733 | if (s->HEVClc->ctb_up_flag || y0b) |
| 734 | depth_top = s->tab_ct_depth[(y_cb - 1) * s->sps->min_cb_width + x_cb]; |
| 735 | |
| 736 | inc += (depth_left > ct_depth); |
| 737 | inc += (depth_top > ct_depth); |
| 738 | |
| 739 | return GET_CABAC(elem_offset[SPLIT_CODING_UNIT_FLAG] + inc); |
| 740 | } |
| 741 | |
| 742 | int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size) |
| 743 | { |
| 744 | if (GET_CABAC(elem_offset[PART_MODE])) // 1 |
| 745 | return PART_2Nx2N; |
| 746 | if (log2_cb_size == s->sps->log2_min_cb_size) { |
| 747 | if (s->HEVClc->cu.pred_mode == MODE_INTRA) // 0 |
| 748 | return PART_NxN; |
| 749 | if (GET_CABAC(elem_offset[PART_MODE] + 1)) // 01 |
| 750 | return PART_2NxN; |
| 751 | if (log2_cb_size == 3) // 00 |
| 752 | return PART_Nx2N; |
| 753 | if (GET_CABAC(elem_offset[PART_MODE] + 2)) // 001 |
| 754 | return PART_Nx2N; |
| 755 | return PART_NxN; // 000 |
| 756 | } |
| 757 | |
| 758 | if (!s->sps->amp_enabled_flag) { |
| 759 | if (GET_CABAC(elem_offset[PART_MODE] + 1)) // 01 |
| 760 | return PART_2NxN; |
| 761 | return PART_Nx2N; |
| 762 | } |
| 763 | |
| 764 | if (GET_CABAC(elem_offset[PART_MODE] + 1)) { // 01X, 01XX |
| 765 | if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 011 |
| 766 | return PART_2NxN; |
| 767 | if (get_cabac_bypass(&s->HEVClc->cc)) // 0101 |
| 768 | return PART_2NxnD; |
| 769 | return PART_2NxnU; // 0100 |
| 770 | } |
| 771 | |
| 772 | if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 001 |
| 773 | return PART_Nx2N; |
| 774 | if (get_cabac_bypass(&s->HEVClc->cc)) // 0001 |
| 775 | return PART_nRx2N; |
| 776 | return PART_nLx2N; // 0000 |
| 777 | } |
| 778 | |
| 779 | int ff_hevc_pcm_flag_decode(HEVCContext *s) |
| 780 | { |
| 781 | return get_cabac_terminate(&s->HEVClc->cc); |
| 782 | } |
| 783 | |
| 784 | int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s) |
| 785 | { |
| 786 | return GET_CABAC(elem_offset[PREV_INTRA_LUMA_PRED_FLAG]); |
| 787 | } |
| 788 | |
| 789 | int ff_hevc_mpm_idx_decode(HEVCContext *s) |
| 790 | { |
| 791 | int i = 0; |
| 792 | while (i < 2 && get_cabac_bypass(&s->HEVClc->cc)) |
| 793 | i++; |
| 794 | return i; |
| 795 | } |
| 796 | |
| 797 | int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s) |
| 798 | { |
| 799 | int i; |
| 800 | int value = get_cabac_bypass(&s->HEVClc->cc); |
| 801 | |
| 802 | for (i = 0; i < 4; i++) |
| 803 | value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc); |
| 804 | return value; |
| 805 | } |
| 806 | |
| 807 | int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s) |
| 808 | { |
| 809 | int ret; |
| 810 | if (!GET_CABAC(elem_offset[INTRA_CHROMA_PRED_MODE])) |
| 811 | return 4; |
| 812 | |
| 813 | ret = get_cabac_bypass(&s->HEVClc->cc) << 1; |
| 814 | ret |= get_cabac_bypass(&s->HEVClc->cc); |
| 815 | return ret; |
| 816 | } |
| 817 | |
| 818 | int ff_hevc_merge_idx_decode(HEVCContext *s) |
| 819 | { |
| 820 | int i = GET_CABAC(elem_offset[MERGE_IDX]); |
| 821 | |
| 822 | if (i != 0) { |
| 823 | while (i < s->sh.max_num_merge_cand-1 && get_cabac_bypass(&s->HEVClc->cc)) |
| 824 | i++; |
| 825 | } |
| 826 | return i; |
| 827 | } |
| 828 | |
| 829 | int ff_hevc_merge_flag_decode(HEVCContext *s) |
| 830 | { |
| 831 | return GET_CABAC(elem_offset[MERGE_FLAG]); |
| 832 | } |
| 833 | |
| 834 | int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH) |
| 835 | { |
| 836 | if (nPbW + nPbH == 12) |
| 837 | return GET_CABAC(elem_offset[INTER_PRED_IDC] + 4); |
| 838 | if (GET_CABAC(elem_offset[INTER_PRED_IDC] + s->HEVClc->ct.depth)) |
| 839 | return PRED_BI; |
| 840 | |
| 841 | return GET_CABAC(elem_offset[INTER_PRED_IDC] + 4); |
| 842 | } |
| 843 | |
| 844 | int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx) |
| 845 | { |
| 846 | int i = 0; |
| 847 | int max = num_ref_idx_lx - 1; |
| 848 | int max_ctx = FFMIN(max, 2); |
| 849 | |
| 850 | while (i < max_ctx && GET_CABAC(elem_offset[REF_IDX_L0] + i)) |
| 851 | i++; |
| 852 | if (i == 2) { |
| 853 | while (i < max && get_cabac_bypass(&s->HEVClc->cc)) |
| 854 | i++; |
| 855 | } |
| 856 | |
| 857 | return i; |
| 858 | } |
| 859 | |
| 860 | int ff_hevc_mvp_lx_flag_decode(HEVCContext *s) |
| 861 | { |
| 862 | return GET_CABAC(elem_offset[MVP_LX_FLAG]); |
| 863 | } |
| 864 | |
| 865 | int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s) |
| 866 | { |
| 867 | return GET_CABAC(elem_offset[NO_RESIDUAL_DATA_FLAG]); |
| 868 | } |
| 869 | |
| 870 | static av_always_inline int abs_mvd_greater0_flag_decode(HEVCContext *s) |
| 871 | { |
| 872 | return GET_CABAC(elem_offset[ABS_MVD_GREATER0_FLAG]); |
| 873 | } |
| 874 | |
| 875 | static av_always_inline int abs_mvd_greater1_flag_decode(HEVCContext *s) |
| 876 | { |
| 877 | return GET_CABAC(elem_offset[ABS_MVD_GREATER1_FLAG] + 1); |
| 878 | } |
| 879 | |
| 880 | static av_always_inline int mvd_decode(HEVCContext *s) |
| 881 | { |
| 882 | int ret = 2; |
| 883 | int k = 1; |
| 884 | |
| 885 | while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) { |
| 886 | ret += 1 << k; |
| 887 | k++; |
| 888 | } |
| 889 | if (k == CABAC_MAX_BIN) |
| 890 | av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k); |
| 891 | while (k--) |
| 892 | ret += get_cabac_bypass(&s->HEVClc->cc) << k; |
| 893 | return get_cabac_bypass_sign(&s->HEVClc->cc, -ret); |
| 894 | } |
| 895 | |
| 896 | static av_always_inline int mvd_sign_flag_decode(HEVCContext *s) |
| 897 | { |
| 898 | return get_cabac_bypass_sign(&s->HEVClc->cc, -1); |
| 899 | } |
| 900 | |
| 901 | int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size) |
| 902 | { |
| 903 | return GET_CABAC(elem_offset[SPLIT_TRANSFORM_FLAG] + 5 - log2_trafo_size); |
| 904 | } |
| 905 | |
| 906 | int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth) |
| 907 | { |
| 908 | return GET_CABAC(elem_offset[CBF_CB_CR] + trafo_depth); |
| 909 | } |
| 910 | |
| 911 | int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth) |
| 912 | { |
| 913 | return GET_CABAC(elem_offset[CBF_LUMA] + !trafo_depth); |
| 914 | } |
| 915 | |
| 916 | static int ff_hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx) |
| 917 | { |
| 918 | return GET_CABAC(elem_offset[TRANSFORM_SKIP_FLAG] + !!c_idx); |
| 919 | } |
| 920 | |
| 921 | static int explicit_rdpcm_flag_decode(HEVCContext *s, int c_idx) |
| 922 | { |
| 923 | return GET_CABAC(elem_offset[EXPLICIT_RDPCM_FLAG] + !!c_idx); |
| 924 | } |
| 925 | |
| 926 | static int explicit_rdpcm_dir_flag_decode(HEVCContext *s, int c_idx) |
| 927 | { |
| 928 | return GET_CABAC(elem_offset[EXPLICIT_RDPCM_DIR_FLAG] + !!c_idx); |
| 929 | } |
| 930 | |
| 931 | int ff_hevc_log2_res_scale_abs(HEVCContext *s, int idx) { |
| 932 | int i =0; |
| 933 | |
| 934 | while (i < 4 && GET_CABAC(elem_offset[LOG2_RES_SCALE_ABS] + 4 * idx + i)) |
| 935 | i++; |
| 936 | |
| 937 | return i; |
| 938 | } |
| 939 | |
| 940 | int ff_hevc_res_scale_sign_flag(HEVCContext *s, int idx) { |
| 941 | return GET_CABAC(elem_offset[RES_SCALE_SIGN_FLAG] + idx); |
| 942 | } |
| 943 | |
| 944 | static av_always_inline void last_significant_coeff_xy_prefix_decode(HEVCContext *s, int c_idx, |
| 945 | int log2_size, int *last_scx_prefix, int *last_scy_prefix) |
| 946 | { |
| 947 | int i = 0; |
| 948 | int max = (log2_size << 1) - 1; |
| 949 | int ctx_offset, ctx_shift; |
| 950 | |
| 951 | if (!c_idx) { |
| 952 | ctx_offset = 3 * (log2_size - 2) + ((log2_size - 1) >> 2); |
| 953 | ctx_shift = (log2_size + 1) >> 2; |
| 954 | } else { |
| 955 | ctx_offset = 15; |
| 956 | ctx_shift = log2_size - 2; |
| 957 | } |
| 958 | while (i < max && |
| 959 | GET_CABAC(elem_offset[LAST_SIGNIFICANT_COEFF_X_PREFIX] + (i >> ctx_shift) + ctx_offset)) |
| 960 | i++; |
| 961 | *last_scx_prefix = i; |
| 962 | |
| 963 | i = 0; |
| 964 | while (i < max && |
| 965 | GET_CABAC(elem_offset[LAST_SIGNIFICANT_COEFF_Y_PREFIX] + (i >> ctx_shift) + ctx_offset)) |
| 966 | i++; |
| 967 | *last_scy_prefix = i; |
| 968 | } |
| 969 | |
| 970 | static av_always_inline int last_significant_coeff_suffix_decode(HEVCContext *s, |
| 971 | int last_significant_coeff_prefix) |
| 972 | { |
| 973 | int i; |
| 974 | int length = (last_significant_coeff_prefix >> 1) - 1; |
| 975 | int value = get_cabac_bypass(&s->HEVClc->cc); |
| 976 | |
| 977 | for (i = 1; i < length; i++) |
| 978 | value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc); |
| 979 | return value; |
| 980 | } |
| 981 | |
| 982 | static av_always_inline int significant_coeff_group_flag_decode(HEVCContext *s, int c_idx, int ctx_cg) |
| 983 | { |
| 984 | int inc; |
| 985 | |
| 986 | inc = FFMIN(ctx_cg, 1) + (c_idx>0 ? 2 : 0); |
| 987 | |
| 988 | return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_GROUP_FLAG] + inc); |
| 989 | } |
| 990 | static av_always_inline int significant_coeff_flag_decode(HEVCContext *s, int x_c, int y_c, |
| 991 | int offset, const uint8_t *ctx_idx_map) |
| 992 | { |
| 993 | int inc = ctx_idx_map[(y_c << 2) + x_c] + offset; |
| 994 | return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + inc); |
| 995 | } |
| 996 | |
| 997 | static av_always_inline int significant_coeff_flag_decode_0(HEVCContext *s, int c_idx, int offset) |
| 998 | { |
| 999 | return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + offset); |
| 1000 | } |
| 1001 | |
| 1002 | static av_always_inline int coeff_abs_level_greater1_flag_decode(HEVCContext *s, int c_idx, int inc) |
| 1003 | { |
| 1004 | |
| 1005 | if (c_idx > 0) |
| 1006 | inc += 16; |
| 1007 | |
| 1008 | return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER1_FLAG] + inc); |
| 1009 | } |
| 1010 | |
| 1011 | static av_always_inline int coeff_abs_level_greater2_flag_decode(HEVCContext *s, int c_idx, int inc) |
| 1012 | { |
| 1013 | if (c_idx > 0) |
| 1014 | inc += 4; |
| 1015 | |
| 1016 | return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER2_FLAG] + inc); |
| 1017 | } |
| 1018 | |
| 1019 | static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int rc_rice_param) |
| 1020 | { |
| 1021 | int prefix = 0; |
| 1022 | int suffix = 0; |
| 1023 | int last_coeff_abs_level_remaining; |
| 1024 | int i; |
| 1025 | |
| 1026 | while (prefix < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) |
| 1027 | prefix++; |
| 1028 | if (prefix == CABAC_MAX_BIN) |
| 1029 | av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix); |
| 1030 | if (prefix < 3) { |
| 1031 | for (i = 0; i < rc_rice_param; i++) |
| 1032 | suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc); |
| 1033 | last_coeff_abs_level_remaining = (prefix << rc_rice_param) + suffix; |
| 1034 | } else { |
| 1035 | int prefix_minus3 = prefix - 3; |
| 1036 | for (i = 0; i < prefix_minus3 + rc_rice_param; i++) |
| 1037 | suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc); |
| 1038 | last_coeff_abs_level_remaining = (((1 << prefix_minus3) + 3 - 1) |
| 1039 | << rc_rice_param) + suffix; |
| 1040 | } |
| 1041 | return last_coeff_abs_level_remaining; |
| 1042 | } |
| 1043 | |
| 1044 | static av_always_inline int coeff_sign_flag_decode(HEVCContext *s, uint8_t nb) |
| 1045 | { |
| 1046 | int i; |
| 1047 | int ret = 0; |
| 1048 | |
| 1049 | for (i = 0; i < nb; i++) |
| 1050 | ret = (ret << 1) | get_cabac_bypass(&s->HEVClc->cc); |
| 1051 | return ret; |
| 1052 | } |
| 1053 | |
| 1054 | void ff_hevc_hls_residual_coding(HEVCContext *s, int x0, int y0, |
| 1055 | int log2_trafo_size, enum ScanType scan_idx, |
| 1056 | int c_idx) |
| 1057 | { |
| 1058 | #define GET_COORD(offset, n) \ |
| 1059 | do { \ |
| 1060 | x_c = (x_cg << 2) + scan_x_off[n]; \ |
| 1061 | y_c = (y_cg << 2) + scan_y_off[n]; \ |
| 1062 | } while (0) |
| 1063 | HEVCLocalContext *lc = s->HEVClc; |
| 1064 | int transform_skip_flag = 0; |
| 1065 | |
| 1066 | int last_significant_coeff_x, last_significant_coeff_y; |
| 1067 | int last_scan_pos; |
| 1068 | int n_end; |
| 1069 | int num_coeff = 0; |
| 1070 | int greater1_ctx = 1; |
| 1071 | |
| 1072 | int num_last_subset; |
| 1073 | int x_cg_last_sig, y_cg_last_sig; |
| 1074 | |
| 1075 | const uint8_t *scan_x_cg, *scan_y_cg, *scan_x_off, *scan_y_off; |
| 1076 | |
| 1077 | ptrdiff_t stride = s->frame->linesize[c_idx]; |
| 1078 | int hshift = s->sps->hshift[c_idx]; |
| 1079 | int vshift = s->sps->vshift[c_idx]; |
| 1080 | uint8_t *dst = &s->frame->data[c_idx][(y0 >> vshift) * stride + |
| 1081 | ((x0 >> hshift) << s->sps->pixel_shift)]; |
| 1082 | int16_t *coeffs = lc->tu.coeffs[c_idx > 0]; |
| 1083 | uint8_t significant_coeff_group_flag[8][8] = {{0}}; |
| 1084 | int explicit_rdpcm_flag = 0; |
| 1085 | int explicit_rdpcm_dir_flag; |
| 1086 | |
| 1087 | int trafo_size = 1 << log2_trafo_size; |
| 1088 | int i; |
| 1089 | int qp,shift,add,scale,scale_m; |
| 1090 | const uint8_t level_scale[] = { 40, 45, 51, 57, 64, 72 }; |
| 1091 | const uint8_t *scale_matrix = NULL; |
| 1092 | uint8_t dc_scale; |
| 1093 | int pred_mode_intra = (c_idx == 0) ? lc->tu.intra_pred_mode : |
| 1094 | lc->tu.intra_pred_mode_c; |
| 1095 | |
| 1096 | memset(coeffs, 0, trafo_size * trafo_size * sizeof(int16_t)); |
| 1097 | |
| 1098 | // Derive QP for dequant |
| 1099 | if (!lc->cu.cu_transquant_bypass_flag) { |
| 1100 | static const int qp_c[] = { 29, 30, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37 }; |
| 1101 | static const uint8_t rem6[51 + 4 * 6 + 1] = { |
| 1102 | 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, |
| 1103 | 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, |
| 1104 | 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, |
| 1105 | 4, 5, 0, 1, 2, 3, 4, 5, 0, 1 |
| 1106 | }; |
| 1107 | |
| 1108 | static const uint8_t div6[51 + 4 * 6 + 1] = { |
| 1109 | 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, |
| 1110 | 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, |
| 1111 | 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, |
| 1112 | 10, 10, 11, 11, 11, 11, 11, 11, 12, 12 |
| 1113 | }; |
| 1114 | int qp_y = lc->qp_y; |
| 1115 | |
| 1116 | if (s->pps->transform_skip_enabled_flag && |
| 1117 | log2_trafo_size <= s->pps->log2_max_transform_skip_block_size) { |
| 1118 | transform_skip_flag = ff_hevc_transform_skip_flag_decode(s, c_idx); |
| 1119 | } |
| 1120 | |
| 1121 | if (c_idx == 0) { |
| 1122 | qp = qp_y + s->sps->qp_bd_offset; |
| 1123 | } else { |
| 1124 | int qp_i, offset; |
| 1125 | |
| 1126 | if (c_idx == 1) |
| 1127 | offset = s->pps->cb_qp_offset + s->sh.slice_cb_qp_offset + |
| 1128 | lc->tu.cu_qp_offset_cb; |
| 1129 | else |
| 1130 | offset = s->pps->cr_qp_offset + s->sh.slice_cr_qp_offset + |
| 1131 | lc->tu.cu_qp_offset_cr; |
| 1132 | |
| 1133 | qp_i = av_clip(qp_y + offset, - s->sps->qp_bd_offset, 57); |
| 1134 | if (s->sps->chroma_format_idc == 1) { |
| 1135 | if (qp_i < 30) |
| 1136 | qp = qp_i; |
| 1137 | else if (qp_i > 43) |
| 1138 | qp = qp_i - 6; |
| 1139 | else |
| 1140 | qp = qp_c[qp_i - 30]; |
| 1141 | } else { |
| 1142 | if (qp_i > 51) |
| 1143 | qp = 51; |
| 1144 | else |
| 1145 | qp = qp_i; |
| 1146 | } |
| 1147 | |
| 1148 | qp += s->sps->qp_bd_offset; |
| 1149 | } |
| 1150 | |
| 1151 | shift = s->sps->bit_depth + log2_trafo_size - 5; |
| 1152 | add = 1 << (shift-1); |
| 1153 | scale = level_scale[rem6[qp]] << (div6[qp]); |
| 1154 | scale_m = 16; // default when no custom scaling lists. |
| 1155 | dc_scale = 16; |
| 1156 | |
| 1157 | if (s->sps->scaling_list_enable_flag && !(transform_skip_flag && log2_trafo_size > 2)) { |
| 1158 | const ScalingList *sl = s->pps->scaling_list_data_present_flag ? |
| 1159 | &s->pps->scaling_list : &s->sps->scaling_list; |
| 1160 | int matrix_id = lc->cu.pred_mode != MODE_INTRA; |
| 1161 | |
| 1162 | matrix_id = 3 * matrix_id + c_idx; |
| 1163 | |
| 1164 | scale_matrix = sl->sl[log2_trafo_size - 2][matrix_id]; |
| 1165 | if (log2_trafo_size >= 4) |
| 1166 | dc_scale = sl->sl_dc[log2_trafo_size - 4][matrix_id]; |
| 1167 | } |
| 1168 | } else { |
| 1169 | shift = 0; |
| 1170 | add = 0; |
| 1171 | scale = 0; |
| 1172 | dc_scale = 0; |
| 1173 | } |
| 1174 | |
| 1175 | if (lc->cu.pred_mode == MODE_INTER && s->sps->explicit_rdpcm_enabled_flag && |
| 1176 | (transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) { |
| 1177 | explicit_rdpcm_flag = explicit_rdpcm_flag_decode(s, c_idx); |
| 1178 | if (explicit_rdpcm_flag) { |
| 1179 | explicit_rdpcm_dir_flag = explicit_rdpcm_dir_flag_decode(s, c_idx); |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | last_significant_coeff_xy_prefix_decode(s, c_idx, log2_trafo_size, |
| 1184 | &last_significant_coeff_x, &last_significant_coeff_y); |
| 1185 | |
| 1186 | if (last_significant_coeff_x > 3) { |
| 1187 | int suffix = last_significant_coeff_suffix_decode(s, last_significant_coeff_x); |
| 1188 | last_significant_coeff_x = (1 << ((last_significant_coeff_x >> 1) - 1)) * |
| 1189 | (2 + (last_significant_coeff_x & 1)) + |
| 1190 | suffix; |
| 1191 | } |
| 1192 | |
| 1193 | if (last_significant_coeff_y > 3) { |
| 1194 | int suffix = last_significant_coeff_suffix_decode(s, last_significant_coeff_y); |
| 1195 | last_significant_coeff_y = (1 << ((last_significant_coeff_y >> 1) - 1)) * |
| 1196 | (2 + (last_significant_coeff_y & 1)) + |
| 1197 | suffix; |
| 1198 | } |
| 1199 | |
| 1200 | if (scan_idx == SCAN_VERT) |
| 1201 | FFSWAP(int, last_significant_coeff_x, last_significant_coeff_y); |
| 1202 | |
| 1203 | x_cg_last_sig = last_significant_coeff_x >> 2; |
| 1204 | y_cg_last_sig = last_significant_coeff_y >> 2; |
| 1205 | |
| 1206 | switch (scan_idx) { |
| 1207 | case SCAN_DIAG: { |
| 1208 | int last_x_c = last_significant_coeff_x & 3; |
| 1209 | int last_y_c = last_significant_coeff_y & 3; |
| 1210 | |
| 1211 | scan_x_off = ff_hevc_diag_scan4x4_x; |
| 1212 | scan_y_off = ff_hevc_diag_scan4x4_y; |
| 1213 | num_coeff = diag_scan4x4_inv[last_y_c][last_x_c]; |
| 1214 | if (trafo_size == 4) { |
| 1215 | scan_x_cg = scan_1x1; |
| 1216 | scan_y_cg = scan_1x1; |
| 1217 | } else if (trafo_size == 8) { |
| 1218 | num_coeff += diag_scan2x2_inv[y_cg_last_sig][x_cg_last_sig] << 4; |
| 1219 | scan_x_cg = diag_scan2x2_x; |
| 1220 | scan_y_cg = diag_scan2x2_y; |
| 1221 | } else if (trafo_size == 16) { |
| 1222 | num_coeff += diag_scan4x4_inv[y_cg_last_sig][x_cg_last_sig] << 4; |
| 1223 | scan_x_cg = ff_hevc_diag_scan4x4_x; |
| 1224 | scan_y_cg = ff_hevc_diag_scan4x4_y; |
| 1225 | } else { // trafo_size == 32 |
| 1226 | num_coeff += diag_scan8x8_inv[y_cg_last_sig][x_cg_last_sig] << 4; |
| 1227 | scan_x_cg = ff_hevc_diag_scan8x8_x; |
| 1228 | scan_y_cg = ff_hevc_diag_scan8x8_y; |
| 1229 | } |
| 1230 | break; |
| 1231 | } |
| 1232 | case SCAN_HORIZ: |
| 1233 | scan_x_cg = horiz_scan2x2_x; |
| 1234 | scan_y_cg = horiz_scan2x2_y; |
| 1235 | scan_x_off = horiz_scan4x4_x; |
| 1236 | scan_y_off = horiz_scan4x4_y; |
| 1237 | num_coeff = horiz_scan8x8_inv[last_significant_coeff_y][last_significant_coeff_x]; |
| 1238 | break; |
| 1239 | default: //SCAN_VERT |
| 1240 | scan_x_cg = horiz_scan2x2_y; |
| 1241 | scan_y_cg = horiz_scan2x2_x; |
| 1242 | scan_x_off = horiz_scan4x4_y; |
| 1243 | scan_y_off = horiz_scan4x4_x; |
| 1244 | num_coeff = horiz_scan8x8_inv[last_significant_coeff_x][last_significant_coeff_y]; |
| 1245 | break; |
| 1246 | } |
| 1247 | num_coeff++; |
| 1248 | num_last_subset = (num_coeff - 1) >> 4; |
| 1249 | |
| 1250 | for (i = num_last_subset; i >= 0; i--) { |
| 1251 | int n, m; |
| 1252 | int x_cg, y_cg, x_c, y_c, pos; |
| 1253 | int implicit_non_zero_coeff = 0; |
| 1254 | int64_t trans_coeff_level; |
| 1255 | int prev_sig = 0; |
| 1256 | int offset = i << 4; |
| 1257 | int rice_init = 0; |
| 1258 | |
| 1259 | uint8_t significant_coeff_flag_idx[16]; |
| 1260 | uint8_t nb_significant_coeff_flag = 0; |
| 1261 | |
| 1262 | x_cg = scan_x_cg[i]; |
| 1263 | y_cg = scan_y_cg[i]; |
| 1264 | |
| 1265 | if ((i < num_last_subset) && (i > 0)) { |
| 1266 | int ctx_cg = 0; |
| 1267 | if (x_cg < (1 << (log2_trafo_size - 2)) - 1) |
| 1268 | ctx_cg += significant_coeff_group_flag[x_cg + 1][y_cg]; |
| 1269 | if (y_cg < (1 << (log2_trafo_size - 2)) - 1) |
| 1270 | ctx_cg += significant_coeff_group_flag[x_cg][y_cg + 1]; |
| 1271 | |
| 1272 | significant_coeff_group_flag[x_cg][y_cg] = |
| 1273 | significant_coeff_group_flag_decode(s, c_idx, ctx_cg); |
| 1274 | implicit_non_zero_coeff = 1; |
| 1275 | } else { |
| 1276 | significant_coeff_group_flag[x_cg][y_cg] = |
| 1277 | ((x_cg == x_cg_last_sig && y_cg == y_cg_last_sig) || |
| 1278 | (x_cg == 0 && y_cg == 0)); |
| 1279 | } |
| 1280 | |
| 1281 | last_scan_pos = num_coeff - offset - 1; |
| 1282 | |
| 1283 | if (i == num_last_subset) { |
| 1284 | n_end = last_scan_pos - 1; |
| 1285 | significant_coeff_flag_idx[0] = last_scan_pos; |
| 1286 | nb_significant_coeff_flag = 1; |
| 1287 | } else { |
| 1288 | n_end = 15; |
| 1289 | } |
| 1290 | |
| 1291 | if (x_cg < ((1 << log2_trafo_size) - 1) >> 2) |
| 1292 | prev_sig = !!significant_coeff_group_flag[x_cg + 1][y_cg]; |
| 1293 | if (y_cg < ((1 << log2_trafo_size) - 1) >> 2) |
| 1294 | prev_sig += (!!significant_coeff_group_flag[x_cg][y_cg + 1] << 1); |
| 1295 | |
| 1296 | if (significant_coeff_group_flag[x_cg][y_cg] && n_end >= 0) { |
| 1297 | static const uint8_t ctx_idx_map[] = { |
| 1298 | 0, 1, 4, 5, 2, 3, 4, 5, 6, 6, 8, 8, 7, 7, 8, 8, // log2_trafo_size == 2 |
| 1299 | 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, // prev_sig == 0 |
| 1300 | 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, // prev_sig == 1 |
| 1301 | 2, 1, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, // prev_sig == 2 |
| 1302 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 // default |
| 1303 | }; |
| 1304 | const uint8_t *ctx_idx_map_p; |
| 1305 | int scf_offset = 0; |
| 1306 | if (s->sps->transform_skip_context_enabled_flag && |
| 1307 | (transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) { |
| 1308 | ctx_idx_map_p = (uint8_t*) &ctx_idx_map[4 * 16]; |
| 1309 | if (c_idx == 0) { |
| 1310 | scf_offset = 40; |
| 1311 | } else { |
| 1312 | scf_offset = 14 + 27; |
| 1313 | } |
| 1314 | } else { |
| 1315 | if (c_idx != 0) |
| 1316 | scf_offset = 27; |
| 1317 | if (log2_trafo_size == 2) { |
| 1318 | ctx_idx_map_p = (uint8_t*) &ctx_idx_map[0]; |
| 1319 | } else { |
| 1320 | ctx_idx_map_p = (uint8_t*) &ctx_idx_map[(prev_sig + 1) << 4]; |
| 1321 | if (c_idx == 0) { |
| 1322 | if ((x_cg > 0 || y_cg > 0)) |
| 1323 | scf_offset += 3; |
| 1324 | if (log2_trafo_size == 3) { |
| 1325 | scf_offset += (scan_idx == SCAN_DIAG) ? 9 : 15; |
| 1326 | } else { |
| 1327 | scf_offset += 21; |
| 1328 | } |
| 1329 | } else { |
| 1330 | if (log2_trafo_size == 3) |
| 1331 | scf_offset += 9; |
| 1332 | else |
| 1333 | scf_offset += 12; |
| 1334 | } |
| 1335 | } |
| 1336 | } |
| 1337 | for (n = n_end; n > 0; n--) { |
| 1338 | x_c = scan_x_off[n]; |
| 1339 | y_c = scan_y_off[n]; |
| 1340 | if (significant_coeff_flag_decode(s, x_c, y_c, scf_offset, ctx_idx_map_p)) { |
| 1341 | significant_coeff_flag_idx[nb_significant_coeff_flag] = n; |
| 1342 | nb_significant_coeff_flag++; |
| 1343 | implicit_non_zero_coeff = 0; |
| 1344 | } |
| 1345 | } |
| 1346 | if (implicit_non_zero_coeff == 0) { |
| 1347 | if (s->sps->transform_skip_context_enabled_flag && |
| 1348 | (transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) { |
| 1349 | if (c_idx == 0) { |
| 1350 | scf_offset = 42; |
| 1351 | } else { |
| 1352 | scf_offset = 16 + 27; |
| 1353 | } |
| 1354 | } else { |
| 1355 | if (i == 0) { |
| 1356 | if (c_idx == 0) |
| 1357 | scf_offset = 0; |
| 1358 | else |
| 1359 | scf_offset = 27; |
| 1360 | } else { |
| 1361 | scf_offset = 2 + scf_offset; |
| 1362 | } |
| 1363 | } |
| 1364 | if (significant_coeff_flag_decode_0(s, c_idx, scf_offset) == 1) { |
| 1365 | significant_coeff_flag_idx[nb_significant_coeff_flag] = 0; |
| 1366 | nb_significant_coeff_flag++; |
| 1367 | } |
| 1368 | } else { |
| 1369 | significant_coeff_flag_idx[nb_significant_coeff_flag] = 0; |
| 1370 | nb_significant_coeff_flag++; |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | n_end = nb_significant_coeff_flag; |
| 1375 | |
| 1376 | |
| 1377 | if (n_end) { |
| 1378 | int first_nz_pos_in_cg; |
| 1379 | int last_nz_pos_in_cg; |
| 1380 | int c_rice_param = 0; |
| 1381 | int first_greater1_coeff_idx = -1; |
| 1382 | uint8_t coeff_abs_level_greater1_flag[8]; |
| 1383 | uint16_t coeff_sign_flag; |
| 1384 | int sum_abs = 0; |
| 1385 | int sign_hidden; |
| 1386 | int sb_type; |
| 1387 | |
| 1388 | |
| 1389 | // initialize first elem of coeff_bas_level_greater1_flag |
| 1390 | int ctx_set = (i > 0 && c_idx == 0) ? 2 : 0; |
| 1391 | |
| 1392 | if (s->sps->persistent_rice_adaptation_enabled_flag) { |
| 1393 | if (!transform_skip_flag && !lc->cu.cu_transquant_bypass_flag) |
| 1394 | sb_type = 2 * (c_idx == 0 ? 1 : 0); |
| 1395 | else |
| 1396 | sb_type = 2 * (c_idx == 0 ? 1 : 0) + 1; |
| 1397 | c_rice_param = lc->stat_coeff[sb_type] / 4; |
| 1398 | } |
| 1399 | |
| 1400 | if (!(i == num_last_subset) && greater1_ctx == 0) |
| 1401 | ctx_set++; |
| 1402 | greater1_ctx = 1; |
| 1403 | last_nz_pos_in_cg = significant_coeff_flag_idx[0]; |
| 1404 | |
| 1405 | for (m = 0; m < (n_end > 8 ? 8 : n_end); m++) { |
| 1406 | int inc = (ctx_set << 2) + greater1_ctx; |
| 1407 | coeff_abs_level_greater1_flag[m] = |
| 1408 | coeff_abs_level_greater1_flag_decode(s, c_idx, inc); |
| 1409 | if (coeff_abs_level_greater1_flag[m]) { |
| 1410 | greater1_ctx = 0; |
| 1411 | if (first_greater1_coeff_idx == -1) |
| 1412 | first_greater1_coeff_idx = m; |
| 1413 | } else if (greater1_ctx > 0 && greater1_ctx < 3) { |
| 1414 | greater1_ctx++; |
| 1415 | } |
| 1416 | } |
| 1417 | first_nz_pos_in_cg = significant_coeff_flag_idx[n_end - 1]; |
| 1418 | |
| 1419 | if (lc->cu.cu_transquant_bypass_flag || |
| 1420 | (lc->cu.pred_mode == MODE_INTRA && |
| 1421 | s->sps->implicit_rdpcm_enabled_flag && transform_skip_flag && |
| 1422 | (pred_mode_intra == 10 || pred_mode_intra == 26 )) || |
| 1423 | explicit_rdpcm_flag) |
| 1424 | sign_hidden = 0; |
| 1425 | else |
| 1426 | sign_hidden = (last_nz_pos_in_cg - first_nz_pos_in_cg >= 4); |
| 1427 | |
| 1428 | if (first_greater1_coeff_idx != -1) { |
| 1429 | coeff_abs_level_greater1_flag[first_greater1_coeff_idx] += coeff_abs_level_greater2_flag_decode(s, c_idx, ctx_set); |
| 1430 | } |
| 1431 | if (!s->pps->sign_data_hiding_flag || !sign_hidden ) { |
| 1432 | coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag) << (16 - nb_significant_coeff_flag); |
| 1433 | } else { |
| 1434 | coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag - 1) << (16 - (nb_significant_coeff_flag - 1)); |
| 1435 | } |
| 1436 | |
| 1437 | for (m = 0; m < n_end; m++) { |
| 1438 | n = significant_coeff_flag_idx[m]; |
| 1439 | GET_COORD(offset, n); |
| 1440 | if (m < 8) { |
| 1441 | trans_coeff_level = 1 + coeff_abs_level_greater1_flag[m]; |
| 1442 | if (trans_coeff_level == ((m == first_greater1_coeff_idx) ? 3 : 2)) { |
| 1443 | int last_coeff_abs_level_remaining = coeff_abs_level_remaining_decode(s, c_rice_param); |
| 1444 | |
| 1445 | trans_coeff_level += last_coeff_abs_level_remaining; |
| 1446 | if (trans_coeff_level > (3 << c_rice_param)) |
| 1447 | c_rice_param = s->sps->persistent_rice_adaptation_enabled_flag ? c_rice_param + 1 : FFMIN(c_rice_param + 1, 4); |
| 1448 | if (s->sps->persistent_rice_adaptation_enabled_flag && !rice_init) { |
| 1449 | int c_rice_p_init = lc->stat_coeff[sb_type] / 4; |
| 1450 | if (last_coeff_abs_level_remaining >= (3 << c_rice_p_init)) |
| 1451 | lc->stat_coeff[sb_type]++; |
| 1452 | else if (2 * last_coeff_abs_level_remaining < (1 << c_rice_p_init)) |
| 1453 | if (lc->stat_coeff[sb_type] > 0) |
| 1454 | lc->stat_coeff[sb_type]--; |
| 1455 | rice_init = 1; |
| 1456 | } |
| 1457 | } |
| 1458 | } else { |
| 1459 | int last_coeff_abs_level_remaining = coeff_abs_level_remaining_decode(s, c_rice_param); |
| 1460 | |
| 1461 | trans_coeff_level = 1 + last_coeff_abs_level_remaining; |
| 1462 | if (trans_coeff_level > (3 << c_rice_param)) |
| 1463 | c_rice_param = s->sps->persistent_rice_adaptation_enabled_flag ? c_rice_param + 1 : FFMIN(c_rice_param + 1, 4); |
| 1464 | if (s->sps->persistent_rice_adaptation_enabled_flag && !rice_init) { |
| 1465 | int c_rice_p_init = lc->stat_coeff[sb_type] / 4; |
| 1466 | if (last_coeff_abs_level_remaining >= (3 << c_rice_p_init)) |
| 1467 | lc->stat_coeff[sb_type]++; |
| 1468 | else if (2 * last_coeff_abs_level_remaining < (1 << c_rice_p_init)) |
| 1469 | if (lc->stat_coeff[sb_type] > 0) |
| 1470 | lc->stat_coeff[sb_type]--; |
| 1471 | rice_init = 1; |
| 1472 | } |
| 1473 | } |
| 1474 | if (s->pps->sign_data_hiding_flag && sign_hidden) { |
| 1475 | sum_abs += trans_coeff_level; |
| 1476 | if (n == first_nz_pos_in_cg && (sum_abs&1)) |
| 1477 | trans_coeff_level = -trans_coeff_level; |
| 1478 | } |
| 1479 | if (coeff_sign_flag >> 15) |
| 1480 | trans_coeff_level = -trans_coeff_level; |
| 1481 | coeff_sign_flag <<= 1; |
| 1482 | if(!lc->cu.cu_transquant_bypass_flag) { |
| 1483 | if (s->sps->scaling_list_enable_flag && !(transform_skip_flag && log2_trafo_size > 2)) { |
| 1484 | if(y_c || x_c || log2_trafo_size < 4) { |
| 1485 | switch(log2_trafo_size) { |
| 1486 | case 3: pos = (y_c << 3) + x_c; break; |
| 1487 | case 4: pos = ((y_c >> 1) << 3) + (x_c >> 1); break; |
| 1488 | case 5: pos = ((y_c >> 2) << 3) + (x_c >> 2); break; |
| 1489 | default: pos = (y_c << 2) + x_c; break; |
| 1490 | } |
| 1491 | scale_m = scale_matrix[pos]; |
| 1492 | } else { |
| 1493 | scale_m = dc_scale; |
| 1494 | } |
| 1495 | } |
| 1496 | trans_coeff_level = (trans_coeff_level * (int64_t)scale * (int64_t)scale_m + add) >> shift; |
| 1497 | if(trans_coeff_level < 0) { |
| 1498 | if((~trans_coeff_level) & 0xFffffffffff8000) |
| 1499 | trans_coeff_level = -32768; |
| 1500 | } else { |
| 1501 | if(trans_coeff_level & 0xffffffffffff8000) |
| 1502 | trans_coeff_level = 32767; |
| 1503 | } |
| 1504 | } |
| 1505 | coeffs[y_c * trafo_size + x_c] = trans_coeff_level; |
| 1506 | } |
| 1507 | } |
| 1508 | } |
| 1509 | |
| 1510 | if (lc->cu.cu_transquant_bypass_flag) { |
| 1511 | if (explicit_rdpcm_flag || (s->sps->implicit_rdpcm_enabled_flag && |
| 1512 | (pred_mode_intra == 10 || pred_mode_intra == 26))) { |
| 1513 | int mode = s->sps->implicit_rdpcm_enabled_flag ? (pred_mode_intra == 26) : explicit_rdpcm_dir_flag; |
| 1514 | |
| 1515 | s->hevcdsp.transform_rdpcm(coeffs, log2_trafo_size, mode); |
| 1516 | } |
| 1517 | } else { |
| 1518 | if (transform_skip_flag) { |
| 1519 | int rot = s->sps->transform_skip_rotation_enabled_flag && |
| 1520 | log2_trafo_size == 2 && |
| 1521 | lc->cu.pred_mode == MODE_INTRA; |
| 1522 | if (rot) { |
| 1523 | for (i = 0; i < 8; i++) |
| 1524 | FFSWAP(int16_t, coeffs[i], coeffs[16 - i - 1]); |
| 1525 | } |
| 1526 | |
| 1527 | s->hevcdsp.transform_skip(coeffs, log2_trafo_size); |
| 1528 | |
| 1529 | if (explicit_rdpcm_flag || (s->sps->implicit_rdpcm_enabled_flag && |
| 1530 | lc->cu.pred_mode == MODE_INTRA && |
| 1531 | (pred_mode_intra == 10 || pred_mode_intra == 26))) { |
| 1532 | int mode = explicit_rdpcm_flag ? explicit_rdpcm_dir_flag : (pred_mode_intra == 26); |
| 1533 | |
| 1534 | s->hevcdsp.transform_rdpcm(coeffs, log2_trafo_size, mode); |
| 1535 | } |
| 1536 | } else if (lc->cu.pred_mode == MODE_INTRA && c_idx == 0 && log2_trafo_size == 2) { |
| 1537 | s->hevcdsp.idct_4x4_luma(coeffs); |
| 1538 | } else { |
| 1539 | int max_xy = FFMAX(last_significant_coeff_x, last_significant_coeff_y); |
| 1540 | if (max_xy == 0) |
| 1541 | s->hevcdsp.idct_dc[log2_trafo_size-2](coeffs); |
| 1542 | else { |
| 1543 | int col_limit = last_significant_coeff_x + last_significant_coeff_y + 4; |
| 1544 | if (max_xy < 4) |
| 1545 | col_limit = FFMIN(4, col_limit); |
| 1546 | else if (max_xy < 8) |
| 1547 | col_limit = FFMIN(8, col_limit); |
| 1548 | else if (max_xy < 12) |
| 1549 | col_limit = FFMIN(24, col_limit); |
| 1550 | s->hevcdsp.idct[log2_trafo_size-2](coeffs, col_limit); |
| 1551 | } |
| 1552 | } |
| 1553 | } |
| 1554 | if (lc->tu.cross_pf) { |
| 1555 | int16_t *coeffs_y = lc->tu.coeffs[0]; |
| 1556 | |
| 1557 | for (i = 0; i < (trafo_size * trafo_size); i++) { |
| 1558 | coeffs[i] = coeffs[i] + ((lc->tu.res_scale_val * coeffs_y[i]) >> 3); |
| 1559 | } |
| 1560 | } |
| 1561 | s->hevcdsp.transform_add[log2_trafo_size-2](dst, coeffs, stride); |
| 1562 | } |
| 1563 | |
| 1564 | void ff_hevc_hls_mvd_coding(HEVCContext *s, int x0, int y0, int log2_cb_size) |
| 1565 | { |
| 1566 | HEVCLocalContext *lc = s->HEVClc; |
| 1567 | int x = abs_mvd_greater0_flag_decode(s); |
| 1568 | int y = abs_mvd_greater0_flag_decode(s); |
| 1569 | |
| 1570 | if (x) |
| 1571 | x += abs_mvd_greater1_flag_decode(s); |
| 1572 | if (y) |
| 1573 | y += abs_mvd_greater1_flag_decode(s); |
| 1574 | |
| 1575 | switch (x) { |
| 1576 | case 2: lc->pu.mvd.x = mvd_decode(s); break; |
| 1577 | case 1: lc->pu.mvd.x = mvd_sign_flag_decode(s); break; |
| 1578 | case 0: lc->pu.mvd.x = 0; break; |
| 1579 | } |
| 1580 | |
| 1581 | switch (y) { |
| 1582 | case 2: lc->pu.mvd.y = mvd_decode(s); break; |
| 1583 | case 1: lc->pu.mvd.y = mvd_sign_flag_decode(s); break; |
| 1584 | case 0: lc->pu.mvd.y = 0; break; |
| 1585 | } |
| 1586 | } |
| 1587 | |