1/* 2 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling 3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * H.264 / AVC / MPEG4 part10 reference picture handling. 25 * @author Michael Niedermayer <michaelni@gmx.at> 26 */ 27 28#include <inttypes.h> 29 30#include "libavutil/avassert.h" 31#include "internal.h" 32#include "avcodec.h" 33#include "h264.h" 34#include "golomb.h" 35#include "mpegutils.h" 36 37#include <assert.h> 38 39#define COPY_PICTURE(dst, src) \ 40do {\ 41 *(dst) = *(src);\ 42 (dst)->f.extended_data = (dst)->f.data;\ 43 (dst)->tf.f = &(dst)->f;\ 44} while (0) 45 46 47static void pic_as_field(H264Picture *pic, const int parity){ 48 int i; 49 for (i = 0; i < 4; ++i) { 50 if (parity == PICT_BOTTOM_FIELD) 51 pic->f.data[i] += pic->f.linesize[i]; 52 pic->reference = parity; 53 pic->f.linesize[i] *= 2; 54 } 55 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD]; 56} 57 58static int split_field_copy(H264Picture *dest, H264Picture *src, int parity, int id_add) 59{ 60 int match = !!(src->reference & parity); 61 62 if (match) { 63 COPY_PICTURE(dest, src); 64 if (parity != PICT_FRAME) { 65 pic_as_field(dest, parity); 66 dest->pic_id *= 2; 67 dest->pic_id += id_add; 68 } 69 } 70 71 return match; 72} 73 74static int build_def_list(H264Picture *def, int def_len, 75 H264Picture **in, int len, int is_long, int sel) 76{ 77 int i[2] = { 0 }; 78 int index = 0; 79 80 while (i[0] < len || i[1] < len) { 81 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel))) 82 i[0]++; 83 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3)))) 84 i[1]++; 85 if (i[0] < len) { 86 av_assert0(index < def_len); 87 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num; 88 split_field_copy(&def[index++], in[i[0]++], sel, 1); 89 } 90 if (i[1] < len) { 91 av_assert0(index < def_len); 92 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num; 93 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0); 94 } 95 } 96 97 return index; 98} 99 100static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir) 101{ 102 int i, best_poc; 103 int out_i = 0; 104 105 for (;;) { 106 best_poc = dir ? INT_MIN : INT_MAX; 107 108 for (i = 0; i < len; i++) { 109 const int poc = src[i]->poc; 110 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) { 111 best_poc = poc; 112 sorted[out_i] = src[i]; 113 } 114 } 115 if (best_poc == (dir ? INT_MIN : INT_MAX)) 116 break; 117 limit = sorted[out_i++]->poc - dir; 118 } 119 return out_i; 120} 121 122int ff_h264_fill_default_ref_list(H264Context *h) 123{ 124 int i, len; 125 126 if (h->slice_type_nos == AV_PICTURE_TYPE_B) { 127 H264Picture *sorted[32]; 128 int cur_poc, list; 129 int lens[2]; 130 131 if (FIELD_PICTURE(h)) 132 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD]; 133 else 134 cur_poc = h->cur_pic_ptr->poc; 135 136 for (list = 0; list < 2; list++) { 137 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list); 138 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list); 139 av_assert0(len <= 32); 140 141 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]), 142 sorted, len, 0, h->picture_structure); 143 len += build_def_list(h->default_ref_list[list] + len, 144 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len, 145 h->long_ref, 16, 1, h->picture_structure); 146 av_assert0(len <= 32); 147 148 if (len < h->ref_count[list]) 149 memset(&h->default_ref_list[list][len], 0, sizeof(H264Picture) * (h->ref_count[list] - len)); 150 lens[list] = len; 151 } 152 153 if (lens[0] == lens[1] && lens[1] > 1) { 154 for (i = 0; i < lens[0] && 155 h->default_ref_list[0][i].f.buf[0]->buffer == 156 h->default_ref_list[1][i].f.buf[0]->buffer; i++); 157 if (i == lens[0]) { 158 H264Picture tmp; 159 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]); 160 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]); 161 COPY_PICTURE(&h->default_ref_list[1][1], &tmp); 162 } 163 } 164 } else { 165 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]), 166 h->short_ref, h->short_ref_count, 0, h->picture_structure); 167 len += build_def_list(h->default_ref_list[0] + len, 168 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len, 169 h-> long_ref, 16, 1, h->picture_structure); 170 av_assert0(len <= 32); 171 172 if (len < h->ref_count[0]) 173 memset(&h->default_ref_list[0][len], 0, sizeof(H264Picture) * (h->ref_count[0] - len)); 174 } 175#ifdef TRACE 176 for (i = 0; i < h->ref_count[0]; i++) { 177 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n", 178 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), 179 h->default_ref_list[0][i].pic_id, 180 h->default_ref_list[0][i].f.data[0]); 181 } 182 if (h->slice_type_nos == AV_PICTURE_TYPE_B) { 183 for (i = 0; i < h->ref_count[1]; i++) { 184 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n", 185 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), 186 h->default_ref_list[1][i].pic_id, 187 h->default_ref_list[1][i].f.data[0]); 188 } 189 } 190#endif 191 return 0; 192} 193 194static void print_short_term(H264Context *h); 195static void print_long_term(H264Context *h); 196 197/** 198 * Extract structure information about the picture described by pic_num in 199 * the current decoding context (frame or field). Note that pic_num is 200 * picture number without wrapping (so, 0<=pic_num<max_pic_num). 201 * @param pic_num picture number for which to extract structure information 202 * @param structure one of PICT_XXX describing structure of picture 203 * with pic_num 204 * @return frame number (short term) or long term index of picture 205 * described by pic_num 206 */ 207static int pic_num_extract(H264Context *h, int pic_num, int *structure) 208{ 209 *structure = h->picture_structure; 210 if (FIELD_PICTURE(h)) { 211 if (!(pic_num & 1)) 212 /* opposite field */ 213 *structure ^= PICT_FRAME; 214 pic_num >>= 1; 215 } 216 217 return pic_num; 218} 219 220int ff_h264_decode_ref_pic_list_reordering(H264Context *h) 221{ 222 int list, index, pic_structure, i; 223 224 print_short_term(h); 225 print_long_term(h); 226 227 for (list = 0; list < h->list_count; list++) { 228 for (i = 0; i < h->ref_count[list]; i++) 229 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]); 230 231 if (get_bits1(&h->gb)) { // ref_pic_list_modification_flag_l[01] 232 int pred = h->curr_pic_num; 233 234 for (index = 0; ; index++) { 235 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&h->gb); 236 unsigned int pic_id; 237 int i; 238 H264Picture *ref = NULL; 239 240 if (modification_of_pic_nums_idc == 3) 241 break; 242 243 if (index >= h->ref_count[list]) { 244 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n"); 245 return -1; 246 } 247 248 switch (modification_of_pic_nums_idc) { 249 case 0: 250 case 1: { 251 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1; 252 int frame_num; 253 254 if (abs_diff_pic_num > h->max_pic_num) { 255 av_log(h->avctx, AV_LOG_ERROR, 256 "abs_diff_pic_num overflow\n"); 257 return AVERROR_INVALIDDATA; 258 } 259 260 if (modification_of_pic_nums_idc == 0) 261 pred -= abs_diff_pic_num; 262 else 263 pred += abs_diff_pic_num; 264 pred &= h->max_pic_num - 1; 265 266 frame_num = pic_num_extract(h, pred, &pic_structure); 267 268 for (i = h->short_ref_count - 1; i >= 0; i--) { 269 ref = h->short_ref[i]; 270 assert(ref->reference); 271 assert(!ref->long_ref); 272 if (ref->frame_num == frame_num && 273 (ref->reference & pic_structure)) 274 break; 275 } 276 if (i >= 0) 277 ref->pic_id = pred; 278 break; 279 } 280 case 2: { 281 int long_idx; 282 pic_id = get_ue_golomb(&h->gb); // long_term_pic_idx 283 284 long_idx = pic_num_extract(h, pic_id, &pic_structure); 285 286 if (long_idx > 31) { 287 av_log(h->avctx, AV_LOG_ERROR, 288 "long_term_pic_idx overflow\n"); 289 return AVERROR_INVALIDDATA; 290 } 291 ref = h->long_ref[long_idx]; 292 assert(!(ref && !ref->reference)); 293 if (ref && (ref->reference & pic_structure)) { 294 ref->pic_id = pic_id; 295 assert(ref->long_ref); 296 i = 0; 297 } else { 298 i = -1; 299 } 300 break; 301 } 302 default: 303 av_log(h->avctx, AV_LOG_ERROR, 304 "illegal modification_of_pic_nums_idc %u\n", 305 modification_of_pic_nums_idc); 306 return AVERROR_INVALIDDATA; 307 } 308 309 if (i < 0) { 310 av_log(h->avctx, AV_LOG_ERROR, 311 "reference picture missing during reorder\n"); 312 memset(&h->ref_list[list][index], 0, sizeof(H264Picture)); // FIXME 313 } else { 314 for (i = index; i + 1 < h->ref_count[list]; i++) { 315 if (ref->long_ref == h->ref_list[list][i].long_ref && 316 ref->pic_id == h->ref_list[list][i].pic_id) 317 break; 318 } 319 for (; i > index; i--) { 320 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]); 321 } 322 COPY_PICTURE(&h->ref_list[list][index], ref); 323 if (FIELD_PICTURE(h)) { 324 pic_as_field(&h->ref_list[list][index], pic_structure); 325 } 326 } 327 } 328 } 329 } 330 for (list = 0; list < h->list_count; list++) { 331 for (index = 0; index < h->ref_count[list]; index++) { 332 if ( !h->ref_list[list][index].f.buf[0] 333 || (!FIELD_PICTURE(h) && (h->ref_list[list][index].reference&3) != 3)) { 334 int i; 335 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc); 336 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++) 337 h->last_pocs[i] = INT_MIN; 338 if (h->default_ref_list[list][0].f.buf[0] 339 && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3)) 340 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]); 341 else 342 return -1; 343 } 344 av_assert0(av_buffer_get_ref_count(h->ref_list[list][index].f.buf[0]) > 0); 345 } 346 } 347 348 return 0; 349} 350 351void ff_h264_fill_mbaff_ref_list(H264Context *h) 352{ 353 int list, i, j; 354 for (list = 0; list < h->list_count; list++) { 355 for (i = 0; i < h->ref_count[list]; i++) { 356 H264Picture *frame = &h->ref_list[list][i]; 357 H264Picture *field = &h->ref_list[list][16 + 2 * i]; 358 COPY_PICTURE(field, frame); 359 for (j = 0; j < 3; j++) 360 field[0].f.linesize[j] <<= 1; 361 field[0].reference = PICT_TOP_FIELD; 362 field[0].poc = field[0].field_poc[0]; 363 COPY_PICTURE(field + 1, field); 364 for (j = 0; j < 3; j++) 365 field[1].f.data[j] += frame->f.linesize[j]; 366 field[1].reference = PICT_BOTTOM_FIELD; 367 field[1].poc = field[1].field_poc[1]; 368 369 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0]; 370 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1]; 371 for (j = 0; j < 2; j++) { 372 h->chroma_weight[16 + 2 * i][list][j][0] = h->chroma_weight[16 + 2 * i + 1][list][j][0] = h->chroma_weight[i][list][j][0]; 373 h->chroma_weight[16 + 2 * i][list][j][1] = h->chroma_weight[16 + 2 * i + 1][list][j][1] = h->chroma_weight[i][list][j][1]; 374 } 375 } 376 } 377} 378 379/** 380 * Mark a picture as no longer needed for reference. The refmask 381 * argument allows unreferencing of individual fields or the whole frame. 382 * If the picture becomes entirely unreferenced, but is being held for 383 * display purposes, it is marked as such. 384 * @param refmask mask of fields to unreference; the mask is bitwise 385 * anded with the reference marking of pic 386 * @return non-zero if pic becomes entirely unreferenced (except possibly 387 * for display purposes) zero if one of the fields remains in 388 * reference 389 */ 390static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask) 391{ 392 int i; 393 if (pic->reference &= refmask) { 394 return 0; 395 } else { 396 for(i = 0; h->delayed_pic[i]; i++) 397 if(pic == h->delayed_pic[i]){ 398 pic->reference = DELAYED_PIC_REF; 399 break; 400 } 401 return 1; 402 } 403} 404 405/** 406 * Find a H264Picture in the short term reference list by frame number. 407 * @param frame_num frame number to search for 408 * @param idx the index into h->short_ref where returned picture is found 409 * undefined if no picture found. 410 * @return pointer to the found picture, or NULL if no pic with the provided 411 * frame number is found 412 */ 413static H264Picture *find_short(H264Context *h, int frame_num, int *idx) 414{ 415 int i; 416 417 for (i = 0; i < h->short_ref_count; i++) { 418 H264Picture *pic = h->short_ref[i]; 419 if (h->avctx->debug & FF_DEBUG_MMCO) 420 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic); 421 if (pic->frame_num == frame_num) { 422 *idx = i; 423 return pic; 424 } 425 } 426 return NULL; 427} 428 429/** 430 * Remove a picture from the short term reference list by its index in 431 * that list. This does no checking on the provided index; it is assumed 432 * to be valid. Other list entries are shifted down. 433 * @param i index into h->short_ref of picture to remove. 434 */ 435static void remove_short_at_index(H264Context *h, int i) 436{ 437 assert(i >= 0 && i < h->short_ref_count); 438 h->short_ref[i] = NULL; 439 if (--h->short_ref_count) 440 memmove(&h->short_ref[i], &h->short_ref[i + 1], 441 (h->short_ref_count - i) * sizeof(H264Picture*)); 442} 443 444/** 445 * 446 * @return the removed picture or NULL if an error occurs 447 */ 448static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask) 449{ 450 H264Picture *pic; 451 int i; 452 453 if (h->avctx->debug & FF_DEBUG_MMCO) 454 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count); 455 456 pic = find_short(h, frame_num, &i); 457 if (pic) { 458 if (unreference_pic(h, pic, ref_mask)) 459 remove_short_at_index(h, i); 460 } 461 462 return pic; 463} 464 465/** 466 * Remove a picture from the long term reference list by its index in 467 * that list. 468 * @return the removed picture or NULL if an error occurs 469 */ 470static H264Picture *remove_long(H264Context *h, int i, int ref_mask) 471{ 472 H264Picture *pic; 473 474 pic = h->long_ref[i]; 475 if (pic) { 476 if (unreference_pic(h, pic, ref_mask)) { 477 assert(h->long_ref[i]->long_ref == 1); 478 h->long_ref[i]->long_ref = 0; 479 h->long_ref[i] = NULL; 480 h->long_ref_count--; 481 } 482 } 483 484 return pic; 485} 486 487void ff_h264_remove_all_refs(H264Context *h) 488{ 489 int i; 490 491 for (i = 0; i < 16; i++) { 492 remove_long(h, i, 0); 493 } 494 assert(h->long_ref_count == 0); 495 496 for (i = 0; i < h->short_ref_count; i++) { 497 unreference_pic(h, h->short_ref[i], 0); 498 h->short_ref[i] = NULL; 499 } 500 h->short_ref_count = 0; 501 502 memset(h->default_ref_list, 0, sizeof(h->default_ref_list)); 503 memset(h->ref_list, 0, sizeof(h->ref_list)); 504} 505 506/** 507 * print short term list 508 */ 509static void print_short_term(H264Context *h) 510{ 511 uint32_t i; 512 if (h->avctx->debug & FF_DEBUG_MMCO) { 513 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n"); 514 for (i = 0; i < h->short_ref_count; i++) { 515 H264Picture *pic = h->short_ref[i]; 516 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n", 517 i, pic->frame_num, pic->poc, pic->f.data[0]); 518 } 519 } 520} 521 522/** 523 * print long term list 524 */ 525static void print_long_term(H264Context *h) 526{ 527 uint32_t i; 528 if (h->avctx->debug & FF_DEBUG_MMCO) { 529 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n"); 530 for (i = 0; i < 16; i++) { 531 H264Picture *pic = h->long_ref[i]; 532 if (pic) { 533 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n", 534 i, pic->frame_num, pic->poc, pic->f.data[0]); 535 } 536 } 537 } 538} 539 540static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos) 541{ 542 int i; 543 544 for (i = 0; i < n_mmcos; i++) { 545 if (mmco1[i].opcode != mmco2[i].opcode) { 546 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n", 547 mmco1[i].opcode, mmco2[i].opcode, i); 548 return -1; 549 } 550 } 551 552 return 0; 553} 554 555int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice) 556{ 557 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp; 558 int mmco_index = 0, i = 0; 559 560 if (h->short_ref_count && 561 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count && 562 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) { 563 mmco[0].opcode = MMCO_SHORT2UNUSED; 564 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num; 565 mmco_index = 1; 566 if (FIELD_PICTURE(h)) { 567 mmco[0].short_pic_num *= 2; 568 mmco[1].opcode = MMCO_SHORT2UNUSED; 569 mmco[1].short_pic_num = mmco[0].short_pic_num + 1; 570 mmco_index = 2; 571 } 572 } 573 574 if (first_slice) { 575 h->mmco_index = mmco_index; 576 } else if (!first_slice && mmco_index >= 0 && 577 (mmco_index != h->mmco_index || 578 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) { 579 av_log(h->avctx, AV_LOG_ERROR, 580 "Inconsistent MMCO state between slices [%d, %d]\n", 581 mmco_index, h->mmco_index); 582 return AVERROR_INVALIDDATA; 583 } 584 return 0; 585} 586 587int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count) 588{ 589 int i, av_uninit(j); 590 int pps_count; 591 int current_ref_assigned = 0, err = 0; 592 H264Picture *av_uninit(pic); 593 594 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0) 595 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n"); 596 597 for (i = 0; i < mmco_count; i++) { 598 int av_uninit(structure), av_uninit(frame_num); 599 if (h->avctx->debug & FF_DEBUG_MMCO) 600 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, 601 h->mmco[i].short_pic_num, h->mmco[i].long_arg); 602 603 if (mmco[i].opcode == MMCO_SHORT2UNUSED || 604 mmco[i].opcode == MMCO_SHORT2LONG) { 605 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure); 606 pic = find_short(h, frame_num, &j); 607 if (!pic) { 608 if (mmco[i].opcode != MMCO_SHORT2LONG || 609 !h->long_ref[mmco[i].long_arg] || 610 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) { 611 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n"); 612 err = AVERROR_INVALIDDATA; 613 } 614 continue; 615 } 616 } 617 618 switch (mmco[i].opcode) { 619 case MMCO_SHORT2UNUSED: 620 if (h->avctx->debug & FF_DEBUG_MMCO) 621 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", 622 h->mmco[i].short_pic_num, h->short_ref_count); 623 remove_short(h, frame_num, structure ^ PICT_FRAME); 624 break; 625 case MMCO_SHORT2LONG: 626 if (h->long_ref[mmco[i].long_arg] != pic) 627 remove_long(h, mmco[i].long_arg, 0); 628 629 remove_short_at_index(h, j); 630 h->long_ref[ mmco[i].long_arg ] = pic; 631 if (h->long_ref[mmco[i].long_arg]) { 632 h->long_ref[mmco[i].long_arg]->long_ref = 1; 633 h->long_ref_count++; 634 } 635 break; 636 case MMCO_LONG2UNUSED: 637 j = pic_num_extract(h, mmco[i].long_arg, &structure); 638 pic = h->long_ref[j]; 639 if (pic) { 640 remove_long(h, j, structure ^ PICT_FRAME); 641 } else if (h->avctx->debug & FF_DEBUG_MMCO) 642 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n"); 643 break; 644 case MMCO_LONG: 645 // Comment below left from previous code as it is an interresting note. 646 /* First field in pair is in short term list or 647 * at a different long term index. 648 * This is not allowed; see 7.4.3.3, notes 2 and 3. 649 * Report the problem and keep the pair where it is, 650 * and mark this field valid. 651 */ 652 if (h->short_ref[0] == h->cur_pic_ptr) { 653 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n"); 654 remove_short_at_index(h, 0); 655 } 656 657 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) { 658 if (h->cur_pic_ptr->long_ref) { 659 for(j=0; j<16; j++) { 660 if(h->long_ref[j] == h->cur_pic_ptr) { 661 remove_long(h, j, 0); 662 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n"); 663 } 664 } 665 } 666 av_assert0(!h->cur_pic_ptr->long_ref); 667 remove_long(h, mmco[i].long_arg, 0); 668 669 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr; 670 h->long_ref[mmco[i].long_arg]->long_ref = 1; 671 h->long_ref_count++; 672 } 673 674 h->cur_pic_ptr->reference |= h->picture_structure; 675 current_ref_assigned = 1; 676 break; 677 case MMCO_SET_MAX_LONG: 678 assert(mmco[i].long_arg <= 16); 679 // just remove the long term which index is greater than new max 680 for (j = mmco[i].long_arg; j < 16; j++) { 681 remove_long(h, j, 0); 682 } 683 break; 684 case MMCO_RESET: 685 while (h->short_ref_count) { 686 remove_short(h, h->short_ref[0]->frame_num, 0); 687 } 688 for (j = 0; j < 16; j++) { 689 remove_long(h, j, 0); 690 } 691 h->frame_num = h->cur_pic_ptr->frame_num = 0; 692 h->mmco_reset = 1; 693 h->cur_pic_ptr->mmco_reset = 1; 694 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++) 695 h->last_pocs[j] = INT_MIN; 696 break; 697 default: assert(0); 698 } 699 } 700 701 if (!current_ref_assigned) { 702 /* Second field of complementary field pair; the first field of 703 * which is already referenced. If short referenced, it 704 * should be first entry in short_ref. If not, it must exist 705 * in long_ref; trying to put it on the short list here is an 706 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3). 707 */ 708 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) { 709 /* Just mark the second field valid */ 710 h->cur_pic_ptr->reference = PICT_FRAME; 711 } else if (h->cur_pic_ptr->long_ref) { 712 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference " 713 "assignment for second field " 714 "in complementary field pair " 715 "(first field is long term)\n"); 716 err = AVERROR_INVALIDDATA; 717 } else { 718 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0); 719 if (pic) { 720 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n"); 721 err = AVERROR_INVALIDDATA; 722 } 723 724 if (h->short_ref_count) 725 memmove(&h->short_ref[1], &h->short_ref[0], 726 h->short_ref_count * sizeof(H264Picture*)); 727 728 h->short_ref[0] = h->cur_pic_ptr; 729 h->short_ref_count++; 730 h->cur_pic_ptr->reference |= h->picture_structure; 731 } 732 } 733 734 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) { 735 736 /* We have too many reference frames, probably due to corrupted 737 * stream. Need to discard one frame. Prevents overrun of the 738 * short_ref and long_ref buffers. 739 */ 740 av_log(h->avctx, AV_LOG_ERROR, 741 "number of reference frames (%d+%d) exceeds max (%d; probably " 742 "corrupt input), discarding one\n", 743 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count); 744 err = AVERROR_INVALIDDATA; 745 746 if (h->long_ref_count && !h->short_ref_count) { 747 for (i = 0; i < 16; ++i) 748 if (h->long_ref[i]) 749 break; 750 751 assert(i < 16); 752 remove_long(h, i, 0); 753 } else { 754 pic = h->short_ref[h->short_ref_count - 1]; 755 remove_short(h, pic->frame_num, 0); 756 } 757 } 758 759 for (i = 0; i<h->short_ref_count; i++) { 760 pic = h->short_ref[i]; 761 if (pic->invalid_gap) { 762 int d = (h->cur_pic_ptr->frame_num - pic->frame_num) & ((1 << h->sps.log2_max_frame_num)-1); 763 if (d > h->sps.ref_frame_count) 764 remove_short(h, pic->frame_num, 0); 765 } 766 } 767 768 print_short_term(h); 769 print_long_term(h); 770 771 pps_count = 0; 772 for (i = 0; i < FF_ARRAY_ELEMS(h->pps_buffers); i++) 773 pps_count += !!h->pps_buffers[i]; 774 775 if ( err >= 0 776 && h->long_ref_count==0 777 && (h->short_ref_count<=2 || h->pps.ref_count[0] <= 1 && h->pps.ref_count[1] <= 1 && pps_count == 1) 778 && h->pps.ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point) 779 && h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){ 780 h->cur_pic_ptr->recovered |= 1; 781 if(!h->avctx->has_b_frames) 782 h->frame_recovered |= FRAME_RECOVERED_SEI; 783 } 784 785 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0; 786} 787 788int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb, 789 int first_slice) 790{ 791 int i, ret; 792 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp; 793 int mmco_index = 0; 794 795 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields 796 skip_bits1(gb); // broken_link 797 if (get_bits1(gb)) { 798 mmco[0].opcode = MMCO_LONG; 799 mmco[0].long_arg = 0; 800 mmco_index = 1; 801 } 802 } else { 803 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag 804 for (i = 0; i < MAX_MMCO_COUNT; i++) { 805 MMCOOpcode opcode = get_ue_golomb_31(gb); 806 807 mmco[i].opcode = opcode; 808 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) { 809 mmco[i].short_pic_num = 810 (h->curr_pic_num - get_ue_golomb(gb) - 1) & 811 (h->max_pic_num - 1); 812#if 0 813 if (mmco[i].short_pic_num >= h->short_ref_count || 814 h->short_ref[ mmco[i].short_pic_num ] == NULL){ 815 av_log(s->avctx, AV_LOG_ERROR, 816 "illegal short ref in memory management control " 817 "operation %d\n", mmco); 818 return -1; 819 } 820#endif 821 } 822 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED || 823 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) { 824 unsigned int long_arg = get_ue_golomb_31(gb); 825 if (long_arg >= 32 || 826 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG && 827 long_arg == 16) && 828 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) { 829 av_log(h->avctx, AV_LOG_ERROR, 830 "illegal long ref in memory management control " 831 "operation %d\n", opcode); 832 return -1; 833 } 834 mmco[i].long_arg = long_arg; 835 } 836 837 if (opcode > (unsigned) MMCO_LONG) { 838 av_log(h->avctx, AV_LOG_ERROR, 839 "illegal memory management control operation %d\n", 840 opcode); 841 return -1; 842 } 843 if (opcode == MMCO_END) 844 break; 845 } 846 mmco_index = i; 847 } else { 848 if (first_slice) { 849 ret = ff_generate_sliding_window_mmcos(h, first_slice); 850 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE) 851 return ret; 852 } 853 mmco_index = -1; 854 } 855 } 856 857 if (first_slice && mmco_index != -1) { 858 memcpy(h->mmco, mmco_temp, sizeof(h->mmco)); 859 h->mmco_index = mmco_index; 860 } else if (!first_slice && mmco_index >= 0 && 861 (mmco_index != h->mmco_index || 862 check_opcodes(h->mmco, mmco_temp, mmco_index))) { 863 av_log(h->avctx, AV_LOG_ERROR, 864 "Inconsistent MMCO state between slices [%d, %d]\n", 865 mmco_index, h->mmco_index); 866 return AVERROR_INVALIDDATA; 867 } 868 869 return 0; 870} 871