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 / MPEG-4 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 "avcodec.h" 32#include "h264.h" 33#include "h264dec.h" 34#include "golomb.h" 35#include "mpegutils.h" 36 37#include <assert.h> 38 39static void pic_as_field(H264Ref *pic, const int parity) 40{ 41 int i; 42 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) { 43 if (parity == PICT_BOTTOM_FIELD) 44 pic->data[i] += pic->linesize[i]; 45 pic->reference = parity; 46 pic->linesize[i] *= 2; 47 } 48 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD]; 49} 50 51static void ref_from_h264pic(H264Ref *dst, H264Picture *src) 52{ 53 memcpy(dst->data, src->f->data, sizeof(dst->data)); 54 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize)); 55 dst->reference = src->reference; 56 dst->poc = src->poc; 57 dst->pic_id = src->pic_id; 58 dst->parent = src; 59} 60 61static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add) 62{ 63 int match = !!(src->reference & parity); 64 65 if (match) { 66 ref_from_h264pic(dest, src); 67 if (parity != PICT_FRAME) { 68 pic_as_field(dest, parity); 69 dest->pic_id *= 2; 70 dest->pic_id += id_add; 71 } 72 } 73 74 return match; 75} 76 77static int build_def_list(H264Ref *def, int def_len, 78 H264Picture * const *in, int len, int is_long, int sel) 79{ 80 int i[2] = { 0 }; 81 int index = 0; 82 83 while (i[0] < len || i[1] < len) { 84 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel))) 85 i[0]++; 86 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3)))) 87 i[1]++; 88 if (i[0] < len) { 89 av_assert0(index < def_len); 90 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num; 91 split_field_copy(&def[index++], in[i[0]++], sel, 1); 92 } 93 if (i[1] < len) { 94 av_assert0(index < def_len); 95 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num; 96 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0); 97 } 98 } 99 100 return index; 101} 102 103static int add_sorted(H264Picture **sorted, H264Picture * const *src, 104 int len, int limit, int dir) 105{ 106 int i, best_poc; 107 int out_i = 0; 108 109 for (;;) { 110 best_poc = dir ? INT_MIN : INT_MAX; 111 112 for (i = 0; i < len; i++) { 113 const int poc = src[i]->poc; 114 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) { 115 best_poc = poc; 116 sorted[out_i] = src[i]; 117 } 118 } 119 if (best_poc == (dir ? INT_MIN : INT_MAX)) 120 break; 121 limit = sorted[out_i++]->poc - dir; 122 } 123 return out_i; 124} 125 126static int mismatches_ref(const H264Context *h, const H264Picture *pic) 127{ 128 const AVFrame *f = pic->f; 129 return (h->cur_pic_ptr->f->width != f->width || 130 h->cur_pic_ptr->f->height != f->height || 131 h->cur_pic_ptr->f->format != f->format); 132} 133 134static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl) 135{ 136 int i, len; 137 int j; 138 139 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) { 140 H264Picture *sorted[32]; 141 int cur_poc, list; 142 int lens[2]; 143 144 if (FIELD_PICTURE(h)) 145 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD]; 146 else 147 cur_poc = h->cur_pic_ptr->poc; 148 149 for (list = 0; list < 2; list++) { 150 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list); 151 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list); 152 av_assert0(len <= 32); 153 154 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]), 155 sorted, len, 0, h->picture_structure); 156 len += build_def_list(sl->ref_list[list] + len, 157 FF_ARRAY_ELEMS(sl->ref_list[0]) - len, 158 h->long_ref, 16, 1, h->picture_structure); 159 av_assert0(len <= 32); 160 161 if (len < sl->ref_count[list]) 162 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len)); 163 lens[list] = len; 164 } 165 166 if (lens[0] == lens[1] && lens[1] > 1) { 167 for (i = 0; i < lens[0] && 168 sl->ref_list[0][i].parent->f->buf[0]->buffer == 169 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++); 170 if (i == lens[0]) { 171 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]); 172 } 173 } 174 } else { 175 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]), 176 h->short_ref, h->short_ref_count, 0, h->picture_structure); 177 len += build_def_list(sl->ref_list[0] + len, 178 FF_ARRAY_ELEMS(sl->ref_list[0]) - len, 179 h-> long_ref, 16, 1, h->picture_structure); 180 av_assert0(len <= 32); 181 182 if (len < sl->ref_count[0]) 183 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len)); 184 } 185#ifdef TRACE 186 for (i = 0; i < sl->ref_count[0]; i++) { 187 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n", 188 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"), 189 sl->ref_list[0][i].pic_id, 190 sl->ref_list[0][i].data[0]); 191 } 192 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) { 193 for (i = 0; i < sl->ref_count[1]; i++) { 194 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n", 195 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"), 196 sl->ref_list[1][i].pic_id, 197 sl->ref_list[1][i].data[0]); 198 } 199 } 200#endif 201 202 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) { 203 for (i = 0; i < sl->ref_count[j]; i++) { 204 if (sl->ref_list[j][i].parent) { 205 if (mismatches_ref(h, sl->ref_list[j][i].parent)) { 206 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n"); 207 memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i])); 208 } 209 } 210 } 211 } 212 for (i = 0; i < sl->list_count; i++) 213 h->default_ref[i] = sl->ref_list[i][0]; 214} 215 216/** 217 * print short term list 218 */ 219static void print_short_term(const H264Context *h) 220{ 221 uint32_t i; 222 if (h->avctx->debug & FF_DEBUG_MMCO) { 223 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n"); 224 for (i = 0; i < h->short_ref_count; i++) { 225 H264Picture *pic = h->short_ref[i]; 226 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n", 227 i, pic->frame_num, pic->poc, pic->f->data[0]); 228 } 229 } 230} 231 232/** 233 * print long term list 234 */ 235static void print_long_term(const H264Context *h) 236{ 237 uint32_t i; 238 if (h->avctx->debug & FF_DEBUG_MMCO) { 239 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n"); 240 for (i = 0; i < 16; i++) { 241 H264Picture *pic = h->long_ref[i]; 242 if (pic) { 243 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n", 244 i, pic->frame_num, pic->poc, pic->f->data[0]); 245 } 246 } 247 } 248} 249 250/** 251 * Extract structure information about the picture described by pic_num in 252 * the current decoding context (frame or field). Note that pic_num is 253 * picture number without wrapping (so, 0<=pic_num<max_pic_num). 254 * @param pic_num picture number for which to extract structure information 255 * @param structure one of PICT_XXX describing structure of picture 256 * with pic_num 257 * @return frame number (short term) or long term index of picture 258 * described by pic_num 259 */ 260static int pic_num_extract(const H264Context *h, int pic_num, int *structure) 261{ 262 *structure = h->picture_structure; 263 if (FIELD_PICTURE(h)) { 264 if (!(pic_num & 1)) 265 /* opposite field */ 266 *structure ^= PICT_FRAME; 267 pic_num >>= 1; 268 } 269 270 return pic_num; 271} 272 273static void h264_fill_mbaff_ref_list(H264SliceContext *sl) 274{ 275 int list, i, j; 276 for (list = 0; list < sl->list_count; list++) { 277 for (i = 0; i < sl->ref_count[list]; i++) { 278 H264Ref *frame = &sl->ref_list[list][i]; 279 H264Ref *field = &sl->ref_list[list][16 + 2 * i]; 280 281 field[0] = *frame; 282 283 for (j = 0; j < 3; j++) 284 field[0].linesize[j] <<= 1; 285 field[0].reference = PICT_TOP_FIELD; 286 field[0].poc = field[0].parent->field_poc[0]; 287 288 field[1] = field[0]; 289 290 for (j = 0; j < 3; j++) 291 field[1].data[j] += frame->parent->f->linesize[j]; 292 field[1].reference = PICT_BOTTOM_FIELD; 293 field[1].poc = field[1].parent->field_poc[1]; 294 } 295 } 296} 297 298int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl) 299{ 300 int list, index, pic_structure; 301 302 print_short_term(h); 303 print_long_term(h); 304 305 h264_initialise_ref_list(h, sl); 306 307 for (list = 0; list < sl->list_count; list++) { 308 int pred = sl->curr_pic_num; 309 310 for (index = 0; index < sl->nb_ref_modifications[list]; index++) { 311 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op; 312 unsigned int val = sl->ref_modifications[list][index].val; 313 unsigned int pic_id; 314 int i; 315 H264Picture *ref = NULL; 316 317 switch (modification_of_pic_nums_idc) { 318 case 0: 319 case 1: { 320 const unsigned int abs_diff_pic_num = val + 1; 321 int frame_num; 322 323 if (abs_diff_pic_num > sl->max_pic_num) { 324 av_log(h->avctx, AV_LOG_ERROR, 325 "abs_diff_pic_num overflow\n"); 326 return AVERROR_INVALIDDATA; 327 } 328 329 if (modification_of_pic_nums_idc == 0) 330 pred -= abs_diff_pic_num; 331 else 332 pred += abs_diff_pic_num; 333 pred &= sl->max_pic_num - 1; 334 335 frame_num = pic_num_extract(h, pred, &pic_structure); 336 337 for (i = h->short_ref_count - 1; i >= 0; i--) { 338 ref = h->short_ref[i]; 339 assert(ref->reference); 340 assert(!ref->long_ref); 341 if (ref->frame_num == frame_num && 342 (ref->reference & pic_structure)) 343 break; 344 } 345 if (i >= 0) 346 ref->pic_id = pred; 347 break; 348 } 349 case 2: { 350 int long_idx; 351 pic_id = val; // long_term_pic_idx 352 353 long_idx = pic_num_extract(h, pic_id, &pic_structure); 354 355 if (long_idx > 31U) { 356 av_log(h->avctx, AV_LOG_ERROR, 357 "long_term_pic_idx overflow\n"); 358 return AVERROR_INVALIDDATA; 359 } 360 ref = h->long_ref[long_idx]; 361 assert(!(ref && !ref->reference)); 362 if (ref && (ref->reference & pic_structure)) { 363 ref->pic_id = pic_id; 364 assert(ref->long_ref); 365 i = 0; 366 } else { 367 i = -1; 368 } 369 break; 370 } 371 default: 372 av_assert0(0); 373 } 374 375 if (i < 0 || mismatches_ref(h, ref)) { 376 av_log(h->avctx, AV_LOG_ERROR, 377 i < 0 ? "reference picture missing during reorder\n" : 378 "mismatching reference\n" 379 ); 380 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME 381 } else { 382 for (i = index; i + 1 < sl->ref_count[list]; i++) { 383 if (sl->ref_list[list][i].parent && 384 ref->long_ref == sl->ref_list[list][i].parent->long_ref && 385 ref->pic_id == sl->ref_list[list][i].pic_id) 386 break; 387 } 388 for (; i > index; i--) { 389 sl->ref_list[list][i] = sl->ref_list[list][i - 1]; 390 } 391 ref_from_h264pic(&sl->ref_list[list][index], ref); 392 if (FIELD_PICTURE(h)) { 393 pic_as_field(&sl->ref_list[list][index], pic_structure); 394 } 395 } 396 } 397 } 398 for (list = 0; list < sl->list_count; list++) { 399 for (index = 0; index < sl->ref_count[list]; index++) { 400 if ( !sl->ref_list[list][index].parent 401 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) { 402 int i; 403 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc); 404 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++) 405 h->last_pocs[i] = INT_MIN; 406 if (h->default_ref[list].parent 407 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3)) 408 sl->ref_list[list][index] = h->default_ref[list]; 409 else 410 return -1; 411 } 412 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0); 413 } 414 } 415 416 if (FRAME_MBAFF(h)) 417 h264_fill_mbaff_ref_list(sl); 418 419 return 0; 420} 421 422int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx) 423{ 424 int list, index; 425 426 sl->nb_ref_modifications[0] = 0; 427 sl->nb_ref_modifications[1] = 0; 428 429 for (list = 0; list < sl->list_count; list++) { 430 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01] 431 continue; 432 433 for (index = 0; ; index++) { 434 unsigned int op = get_ue_golomb_31(&sl->gb); 435 436 if (op == 3) 437 break; 438 439 if (index >= sl->ref_count[list]) { 440 av_log(logctx, AV_LOG_ERROR, "reference count overflow\n"); 441 return AVERROR_INVALIDDATA; 442 } else if (op > 2) { 443 av_log(logctx, AV_LOG_ERROR, 444 "illegal modification_of_pic_nums_idc %u\n", 445 op); 446 return AVERROR_INVALIDDATA; 447 } 448 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb); 449 sl->ref_modifications[list][index].op = op; 450 sl->nb_ref_modifications[list]++; 451 } 452 } 453 454 return 0; 455} 456 457/** 458 * Mark a picture as no longer needed for reference. The refmask 459 * argument allows unreferencing of individual fields or the whole frame. 460 * If the picture becomes entirely unreferenced, but is being held for 461 * display purposes, it is marked as such. 462 * @param refmask mask of fields to unreference; the mask is bitwise 463 * anded with the reference marking of pic 464 * @return non-zero if pic becomes entirely unreferenced (except possibly 465 * for display purposes) zero if one of the fields remains in 466 * reference 467 */ 468static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask) 469{ 470 int i; 471 if (pic->reference &= refmask) { 472 return 0; 473 } else { 474 for(i = 0; h->delayed_pic[i]; i++) 475 if(pic == h->delayed_pic[i]){ 476 pic->reference = DELAYED_PIC_REF; 477 break; 478 } 479 return 1; 480 } 481} 482 483/** 484 * Find a H264Picture in the short term reference list by frame number. 485 * @param frame_num frame number to search for 486 * @param idx the index into h->short_ref where returned picture is found 487 * undefined if no picture found. 488 * @return pointer to the found picture, or NULL if no pic with the provided 489 * frame number is found 490 */ 491static H264Picture *find_short(H264Context *h, int frame_num, int *idx) 492{ 493 int i; 494 495 for (i = 0; i < h->short_ref_count; i++) { 496 H264Picture *pic = h->short_ref[i]; 497 if (h->avctx->debug & FF_DEBUG_MMCO) 498 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic); 499 if (pic->frame_num == frame_num) { 500 *idx = i; 501 return pic; 502 } 503 } 504 return NULL; 505} 506 507/** 508 * Remove a picture from the short term reference list by its index in 509 * that list. This does no checking on the provided index; it is assumed 510 * to be valid. Other list entries are shifted down. 511 * @param i index into h->short_ref of picture to remove. 512 */ 513static void remove_short_at_index(H264Context *h, int i) 514{ 515 assert(i >= 0 && i < h->short_ref_count); 516 h->short_ref[i] = NULL; 517 if (--h->short_ref_count) 518 memmove(&h->short_ref[i], &h->short_ref[i + 1], 519 (h->short_ref_count - i) * sizeof(H264Picture*)); 520} 521 522/** 523 * @return the removed picture or NULL if an error occurs 524 */ 525static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask) 526{ 527 H264Picture *pic; 528 int i; 529 530 if (h->avctx->debug & FF_DEBUG_MMCO) 531 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count); 532 533 pic = find_short(h, frame_num, &i); 534 if (pic) { 535 if (unreference_pic(h, pic, ref_mask)) 536 remove_short_at_index(h, i); 537 } 538 539 return pic; 540} 541 542/** 543 * Remove a picture from the long term reference list by its index in 544 * that list. 545 * @return the removed picture or NULL if an error occurs 546 */ 547static H264Picture *remove_long(H264Context *h, int i, int ref_mask) 548{ 549 H264Picture *pic; 550 551 pic = h->long_ref[i]; 552 if (pic) { 553 if (unreference_pic(h, pic, ref_mask)) { 554 assert(h->long_ref[i]->long_ref == 1); 555 h->long_ref[i]->long_ref = 0; 556 h->long_ref[i] = NULL; 557 h->long_ref_count--; 558 } 559 } 560 561 return pic; 562} 563 564void ff_h264_remove_all_refs(H264Context *h) 565{ 566 int i; 567 568 for (i = 0; i < 16; i++) { 569 remove_long(h, i, 0); 570 } 571 assert(h->long_ref_count == 0); 572 573 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) { 574 ff_h264_unref_picture(h, &h->last_pic_for_ec); 575 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]); 576 } 577 578 for (i = 0; i < h->short_ref_count; i++) { 579 unreference_pic(h, h->short_ref[i], 0); 580 h->short_ref[i] = NULL; 581 } 582 h->short_ref_count = 0; 583 584 memset(h->default_ref, 0, sizeof(h->default_ref)); 585} 586 587static void generate_sliding_window_mmcos(H264Context *h) 588{ 589 MMCO *mmco = h->mmco; 590 int nb_mmco = 0; 591 592 if (h->short_ref_count && 593 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count && 594 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) { 595 mmco[0].opcode = MMCO_SHORT2UNUSED; 596 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num; 597 nb_mmco = 1; 598 if (FIELD_PICTURE(h)) { 599 mmco[0].short_pic_num *= 2; 600 mmco[1].opcode = MMCO_SHORT2UNUSED; 601 mmco[1].short_pic_num = mmco[0].short_pic_num + 1; 602 nb_mmco = 2; 603 } 604 } 605 606 h->nb_mmco = nb_mmco; 607} 608 609int ff_h264_execute_ref_pic_marking(H264Context *h) 610{ 611 MMCO *mmco = h->mmco; 612 int mmco_count; 613 int i, av_uninit(j); 614 int pps_ref_count[2] = {0}; 615 int current_ref_assigned = 0, err = 0; 616 H264Picture *av_uninit(pic); 617 618 if (!h->ps.sps) { 619 av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n"); 620 err = AVERROR_INVALIDDATA; 621 goto out; 622 } 623 624 if (!h->explicit_ref_marking) 625 generate_sliding_window_mmcos(h); 626 mmco_count = h->nb_mmco; 627 628 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0) 629 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n"); 630 631 for (i = 0; i < mmco_count; i++) { 632 int av_uninit(structure), av_uninit(frame_num); 633 if (h->avctx->debug & FF_DEBUG_MMCO) 634 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, 635 h->mmco[i].short_pic_num, h->mmco[i].long_arg); 636 637 if (mmco[i].opcode == MMCO_SHORT2UNUSED || 638 mmco[i].opcode == MMCO_SHORT2LONG) { 639 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure); 640 pic = find_short(h, frame_num, &j); 641 if (!pic) { 642 if (mmco[i].opcode != MMCO_SHORT2LONG || 643 !h->long_ref[mmco[i].long_arg] || 644 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) { 645 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n"); 646 err = AVERROR_INVALIDDATA; 647 } 648 continue; 649 } 650 } 651 652 switch (mmco[i].opcode) { 653 case MMCO_SHORT2UNUSED: 654 if (h->avctx->debug & FF_DEBUG_MMCO) 655 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", 656 h->mmco[i].short_pic_num, h->short_ref_count); 657 remove_short(h, frame_num, structure ^ PICT_FRAME); 658 break; 659 case MMCO_SHORT2LONG: 660 if (h->long_ref[mmco[i].long_arg] != pic) 661 remove_long(h, mmco[i].long_arg, 0); 662 663 remove_short_at_index(h, j); 664 h->long_ref[ mmco[i].long_arg ] = pic; 665 if (h->long_ref[mmco[i].long_arg]) { 666 h->long_ref[mmco[i].long_arg]->long_ref = 1; 667 h->long_ref_count++; 668 } 669 break; 670 case MMCO_LONG2UNUSED: 671 j = pic_num_extract(h, mmco[i].long_arg, &structure); 672 pic = h->long_ref[j]; 673 if (pic) { 674 remove_long(h, j, structure ^ PICT_FRAME); 675 } else if (h->avctx->debug & FF_DEBUG_MMCO) 676 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n"); 677 break; 678 case MMCO_LONG: 679 // Comment below left from previous code as it is an interesting note. 680 /* First field in pair is in short term list or 681 * at a different long term index. 682 * This is not allowed; see 7.4.3.3, notes 2 and 3. 683 * Report the problem and keep the pair where it is, 684 * and mark this field valid. 685 */ 686 if (h->short_ref[0] == h->cur_pic_ptr) { 687 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n"); 688 remove_short_at_index(h, 0); 689 } 690 691 /* make sure the current picture is not already assigned as a long ref */ 692 if (h->cur_pic_ptr->long_ref) { 693 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) { 694 if (h->long_ref[j] == h->cur_pic_ptr) { 695 if (j != mmco[i].long_arg) 696 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n"); 697 remove_long(h, j, 0); 698 } 699 } 700 } 701 702 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) { 703 av_assert0(!h->cur_pic_ptr->long_ref); 704 remove_long(h, mmco[i].long_arg, 0); 705 706 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr; 707 h->long_ref[mmco[i].long_arg]->long_ref = 1; 708 h->long_ref_count++; 709 } 710 711 h->cur_pic_ptr->reference |= h->picture_structure; 712 current_ref_assigned = 1; 713 break; 714 case MMCO_SET_MAX_LONG: 715 assert(mmco[i].long_arg <= 16); 716 // just remove the long term which index is greater than new max 717 for (j = mmco[i].long_arg; j < 16; j++) { 718 remove_long(h, j, 0); 719 } 720 break; 721 case MMCO_RESET: 722 while (h->short_ref_count) { 723 remove_short(h, h->short_ref[0]->frame_num, 0); 724 } 725 for (j = 0; j < 16; j++) { 726 remove_long(h, j, 0); 727 } 728 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0; 729 h->mmco_reset = 1; 730 h->cur_pic_ptr->mmco_reset = 1; 731 for (j = 0; j < FF_ARRAY_ELEMS(h->last_pocs); j++) 732 h->last_pocs[j] = INT_MIN; 733 break; 734 default: av_assert0(0); 735 } 736 } 737 738 if (!current_ref_assigned) { 739 /* Second field of complementary field pair; the first field of 740 * which is already referenced. If short referenced, it 741 * should be first entry in short_ref. If not, it must exist 742 * in long_ref; trying to put it on the short list here is an 743 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3). 744 */ 745 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) { 746 /* Just mark the second field valid */ 747 h->cur_pic_ptr->reference |= h->picture_structure; 748 } else if (h->cur_pic_ptr->long_ref) { 749 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference " 750 "assignment for second field " 751 "in complementary field pair " 752 "(first field is long term)\n"); 753 err = AVERROR_INVALIDDATA; 754 } else { 755 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0); 756 if (pic) { 757 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n"); 758 err = AVERROR_INVALIDDATA; 759 } 760 761 if (h->short_ref_count) 762 memmove(&h->short_ref[1], &h->short_ref[0], 763 h->short_ref_count * sizeof(H264Picture*)); 764 765 h->short_ref[0] = h->cur_pic_ptr; 766 h->short_ref_count++; 767 h->cur_pic_ptr->reference |= h->picture_structure; 768 } 769 } 770 771 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) { 772 773 /* We have too many reference frames, probably due to corrupted 774 * stream. Need to discard one frame. Prevents overrun of the 775 * short_ref and long_ref buffers. 776 */ 777 av_log(h->avctx, AV_LOG_ERROR, 778 "number of reference frames (%d+%d) exceeds max (%d; probably " 779 "corrupt input), discarding one\n", 780 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count); 781 err = AVERROR_INVALIDDATA; 782 783 if (h->long_ref_count && !h->short_ref_count) { 784 for (i = 0; i < 16; ++i) 785 if (h->long_ref[i]) 786 break; 787 788 assert(i < 16); 789 remove_long(h, i, 0); 790 } else { 791 pic = h->short_ref[h->short_ref_count - 1]; 792 remove_short(h, pic->frame_num, 0); 793 } 794 } 795 796 for (i = 0; i<h->short_ref_count; i++) { 797 pic = h->short_ref[i]; 798 if (pic->invalid_gap) { 799 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num); 800 if (d > h->ps.sps->ref_frame_count) 801 remove_short(h, pic->frame_num, 0); 802 } 803 } 804 805 print_short_term(h); 806 print_long_term(h); 807 808 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) { 809 if (h->ps.pps_list[i]) { 810 const PPS *pps = (const PPS *)h->ps.pps_list[i]->data; 811 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]); 812 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]); 813 } 814 } 815 816 // Detect unmarked random access points 817 if ( err >= 0 818 && h->long_ref_count==0 819 && ( h->short_ref_count<=2 820 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames 821 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1) 822 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point) 823 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){ 824 h->cur_pic_ptr->recovered |= 1; 825 if(!h->avctx->has_b_frames) 826 h->frame_recovered |= FRAME_RECOVERED_SEI; 827 } 828 829out: 830 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0; 831} 832 833int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb, 834 const H2645NAL *nal, void *logctx) 835{ 836 int i; 837 MMCO *mmco = sl->mmco; 838 int nb_mmco = 0; 839 840 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields 841 skip_bits1(gb); // broken_link 842 if (get_bits1(gb)) { 843 mmco[0].opcode = MMCO_LONG; 844 mmco[0].long_arg = 0; 845 nb_mmco = 1; 846 } 847 sl->explicit_ref_marking = 1; 848 } else { 849 sl->explicit_ref_marking = get_bits1(gb); 850 if (sl->explicit_ref_marking) { 851 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) { 852 MMCOOpcode opcode = get_ue_golomb_31(gb); 853 854 mmco[i].opcode = opcode; 855 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) { 856 mmco[i].short_pic_num = 857 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) & 858 (sl->max_pic_num - 1); 859 } 860 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED || 861 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) { 862 unsigned int long_arg = get_ue_golomb_31(gb); 863 if (long_arg >= 32 || 864 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG && 865 long_arg == 16) && 866 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) { 867 av_log(logctx, AV_LOG_ERROR, 868 "illegal long ref in memory management control " 869 "operation %d\n", opcode); 870 sl->nb_mmco = i; 871 return -1; 872 } 873 mmco[i].long_arg = long_arg; 874 } 875 876 if (opcode > (unsigned) MMCO_LONG) { 877 av_log(logctx, AV_LOG_ERROR, 878 "illegal memory management control operation %d\n", 879 opcode); 880 sl->nb_mmco = i; 881 return -1; 882 } 883 if (opcode == MMCO_END) 884 break; 885 } 886 nb_mmco = i; 887 } 888 } 889 890 sl->nb_mmco = nb_mmco; 891 892 return 0; 893} 894