2 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * H.264 / AVC / MPEG4 part10 reference picture handling.
25 * @author Michael Niedermayer <michaelni@gmx.at>
34 #include "mpegutils.h"
38 static void pic_as_field(H264Ref *pic, const int parity)
41 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
42 if (parity == PICT_BOTTOM_FIELD)
43 pic->data[i] += pic->linesize[i];
44 pic->reference = parity;
45 pic->linesize[i] *= 2;
47 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
50 static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
52 memcpy(dst->data, src->f->data, sizeof(dst->data));
53 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
54 dst->reference = src->reference;
56 dst->pic_id = src->pic_id;
60 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
62 int match = !!(src->reference & parity);
65 ref_from_h264pic(dest, src);
66 if (parity != PICT_FRAME) {
67 pic_as_field(dest, parity);
69 dest->pic_id += id_add;
76 static int build_def_list(H264Ref *def, int def_len,
77 H264Picture **in, int len, int is_long, int sel)
82 while ((i[0] < len || i[1] < len) && index < def_len) {
83 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87 if (i[0] < len && index < def_len) {
88 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
89 split_field_copy(&def[index++], in[i[0]++], sel, 1);
91 if (i[1] < len && 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);
100 static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir)
106 best_poc = dir ? INT_MIN : INT_MAX;
108 for (i = 0; i < len; i++) {
109 const int poc = src[i]->poc;
110 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
112 sorted[out_i] = src[i];
115 if (best_poc == (dir ? INT_MIN : INT_MAX))
117 limit = sorted[out_i++]->poc - dir;
122 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
126 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
127 H264Picture *sorted[32];
131 if (FIELD_PICTURE(h))
132 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
134 cur_poc = h->cur_pic_ptr->poc;
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);
141 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
142 sorted, len, 0, h->picture_structure);
143 len += build_def_list(sl->ref_list[list] + len,
144 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
145 h->long_ref, 16, 1, h->picture_structure);
147 if (len < sl->ref_count[list])
148 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
152 if (lens[0] == lens[1] && lens[1] > 1) {
153 for (i = 0; i < lens[0] &&
154 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
155 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
157 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
161 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
162 h->short_ref, h->short_ref_count, 0, h->picture_structure);
163 len += build_def_list(sl->ref_list[0] + len,
164 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
165 h-> long_ref, 16, 1, h->picture_structure);
167 if (len < sl->ref_count[0])
168 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
171 for (i = 0; i < sl->ref_count[0]; i++) {
172 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
173 (sl->ref_list[0][i].long_ref ? "LT" : "ST"),
174 sl->ref_list[0][i].pic_id,
175 sl->ref_list[0][i].f->data[0]);
177 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
178 for (i = 0; i < sl->ref_count[1]; i++) {
179 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
180 (sl->ref_list[1][i].long_ref ? "LT" : "ST"),
181 sl->ref_list[1][i].pic_id,
182 sl->ref_list[1][i].f->data[0]);
188 static void print_short_term(H264Context *h);
189 static void print_long_term(H264Context *h);
192 * Extract structure information about the picture described by pic_num in
193 * the current decoding context (frame or field). Note that pic_num is
194 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
195 * @param pic_num picture number for which to extract structure information
196 * @param structure one of PICT_XXX describing structure of picture
198 * @return frame number (short term) or long term index of picture
199 * described by pic_num
201 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
203 *structure = h->picture_structure;
204 if (FIELD_PICTURE(h)) {
207 *structure ^= PICT_FRAME;
214 int ff_h264_decode_ref_pic_list_reordering(H264Context *h, H264SliceContext *sl)
216 int list, index, pic_structure;
221 h264_initialise_ref_list(h, sl);
223 for (list = 0; list < sl->list_count; list++) {
224 if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
225 int pred = h->curr_pic_num;
227 for (index = 0; ; index++) {
228 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
231 H264Picture *ref = NULL;
233 if (modification_of_pic_nums_idc == 3)
236 if (index >= sl->ref_count[list]) {
237 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
241 switch (modification_of_pic_nums_idc) {
244 const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
247 if (abs_diff_pic_num > h->max_pic_num) {
248 av_log(h->avctx, AV_LOG_ERROR,
249 "abs_diff_pic_num overflow\n");
250 return AVERROR_INVALIDDATA;
253 if (modification_of_pic_nums_idc == 0)
254 pred -= abs_diff_pic_num;
256 pred += abs_diff_pic_num;
257 pred &= h->max_pic_num - 1;
259 frame_num = pic_num_extract(h, pred, &pic_structure);
261 for (i = h->short_ref_count - 1; i >= 0; i--) {
262 ref = h->short_ref[i];
263 assert(ref->reference);
264 assert(!ref->long_ref);
265 if (ref->frame_num == frame_num &&
266 (ref->reference & pic_structure))
275 pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
277 long_idx = pic_num_extract(h, pic_id, &pic_structure);
280 av_log(h->avctx, AV_LOG_ERROR,
281 "long_term_pic_idx overflow\n");
282 return AVERROR_INVALIDDATA;
284 ref = h->long_ref[long_idx];
285 assert(!(ref && !ref->reference));
286 if (ref && (ref->reference & pic_structure)) {
287 ref->pic_id = pic_id;
288 assert(ref->long_ref);
296 av_log(h->avctx, AV_LOG_ERROR,
297 "illegal modification_of_pic_nums_idc %u\n",
298 modification_of_pic_nums_idc);
299 return AVERROR_INVALIDDATA;
303 av_log(h->avctx, AV_LOG_ERROR,
304 "reference picture missing during reorder\n");
305 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
307 for (i = index; i + 1 < sl->ref_count[list]; i++) {
308 if (sl->ref_list[list][i].parent &&
309 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
310 ref->pic_id == sl->ref_list[list][i].pic_id)
313 for (; i > index; i--) {
314 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
316 ref_from_h264pic(&sl->ref_list[list][index], ref);
317 if (FIELD_PICTURE(h)) {
318 pic_as_field(&sl->ref_list[list][index], pic_structure);
324 for (list = 0; list < sl->list_count; list++) {
325 for (index = 0; index < sl->ref_count[list]; index++) {
326 if (!sl->ref_list[list][index].parent) {
327 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
336 void ff_h264_fill_mbaff_ref_list(H264Context *h, H264SliceContext *sl)
339 for (list = 0; list < sl->list_count; list++) { //FIXME try list_count
340 for (i = 0; i < sl->ref_count[list]; i++) {
341 H264Ref *frame = &sl->ref_list[list][i];
342 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
346 for (j = 0; j < 3; j++)
347 field[0].linesize[j] <<= 1;
348 field[0].reference = PICT_TOP_FIELD;
349 field[0].poc = field[0].parent->field_poc[0];
353 for (j = 0; j < 3; j++)
354 field[1].data[j] += frame->parent->f->linesize[j];
355 field[1].reference = PICT_BOTTOM_FIELD;
356 field[1].poc = field[1].parent->field_poc[1];
358 sl->luma_weight[16 + 2 * i][list][0] = sl->luma_weight[16 + 2 * i + 1][list][0] = sl->luma_weight[i][list][0];
359 sl->luma_weight[16 + 2 * i][list][1] = sl->luma_weight[16 + 2 * i + 1][list][1] = sl->luma_weight[i][list][1];
360 for (j = 0; j < 2; j++) {
361 sl->chroma_weight[16 + 2 * i][list][j][0] = sl->chroma_weight[16 + 2 * i + 1][list][j][0] = sl->chroma_weight[i][list][j][0];
362 sl->chroma_weight[16 + 2 * i][list][j][1] = sl->chroma_weight[16 + 2 * i + 1][list][j][1] = sl->chroma_weight[i][list][j][1];
369 * Mark a picture as no longer needed for reference. The refmask
370 * argument allows unreferencing of individual fields or the whole frame.
371 * If the picture becomes entirely unreferenced, but is being held for
372 * display purposes, it is marked as such.
373 * @param refmask mask of fields to unreference; the mask is bitwise
374 * anded with the reference marking of pic
375 * @return non-zero if pic becomes entirely unreferenced (except possibly
376 * for display purposes) zero if one of the fields remains in
379 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
382 if (pic->reference &= refmask) {
385 for(i = 0; h->delayed_pic[i]; i++)
386 if(pic == h->delayed_pic[i]){
387 pic->reference = DELAYED_PIC_REF;
395 * Find a H264Picture in the short term reference list by frame number.
396 * @param frame_num frame number to search for
397 * @param idx the index into h->short_ref where returned picture is found
398 * undefined if no picture found.
399 * @return pointer to the found picture, or NULL if no pic with the provided
400 * frame number is found
402 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
406 for (i = 0; i < h->short_ref_count; i++) {
407 H264Picture *pic = h->short_ref[i];
408 if (h->avctx->debug & FF_DEBUG_MMCO)
409 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
410 if (pic->frame_num == frame_num) {
419 * Remove a picture from the short term reference list by its index in
420 * that list. This does no checking on the provided index; it is assumed
421 * to be valid. Other list entries are shifted down.
422 * @param i index into h->short_ref of picture to remove.
424 static void remove_short_at_index(H264Context *h, int i)
426 assert(i >= 0 && i < h->short_ref_count);
427 h->short_ref[i] = NULL;
428 if (--h->short_ref_count)
429 memmove(&h->short_ref[i], &h->short_ref[i + 1],
430 (h->short_ref_count - i) * sizeof(H264Picture*));
435 * @return the removed picture or NULL if an error occurs
437 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
442 if (h->avctx->debug & FF_DEBUG_MMCO)
443 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
445 pic = find_short(h, frame_num, &i);
447 if (unreference_pic(h, pic, ref_mask))
448 remove_short_at_index(h, i);
455 * Remove a picture from the long term reference list by its index in
457 * @return the removed picture or NULL if an error occurs
459 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
463 pic = h->long_ref[i];
465 if (unreference_pic(h, pic, ref_mask)) {
466 assert(h->long_ref[i]->long_ref == 1);
467 h->long_ref[i]->long_ref = 0;
468 h->long_ref[i] = NULL;
476 void ff_h264_remove_all_refs(H264Context *h)
480 for (i = 0; i < 16; i++) {
481 remove_long(h, i, 0);
483 assert(h->long_ref_count == 0);
485 for (i = 0; i < h->short_ref_count; i++) {
486 unreference_pic(h, h->short_ref[i], 0);
487 h->short_ref[i] = NULL;
489 h->short_ref_count = 0;
493 * print short term list
495 static void print_short_term(H264Context *h)
498 if (h->avctx->debug & FF_DEBUG_MMCO) {
499 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
500 for (i = 0; i < h->short_ref_count; i++) {
501 H264Picture *pic = h->short_ref[i];
502 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
503 i, pic->frame_num, pic->poc, pic->f->data[0]);
509 * print long term list
511 static void print_long_term(H264Context *h)
514 if (h->avctx->debug & FF_DEBUG_MMCO) {
515 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
516 for (i = 0; i < 16; i++) {
517 H264Picture *pic = h->long_ref[i];
519 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
520 i, pic->frame_num, pic->poc, pic->f->data[0]);
526 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
530 for (i = 0; i < n_mmcos; i++) {
531 if (mmco1[i].opcode != mmco2[i].opcode)
538 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
540 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
541 int mmco_index = 0, i = 0;
543 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
545 if (h->short_ref_count &&
546 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
547 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
548 mmco[0].opcode = MMCO_SHORT2UNUSED;
549 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
551 if (FIELD_PICTURE(h)) {
552 mmco[0].short_pic_num *= 2;
553 mmco[1].opcode = MMCO_SHORT2UNUSED;
554 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
560 h->mmco_index = mmco_index;
561 } else if (!first_slice && mmco_index >= 0 &&
562 (mmco_index != h->mmco_index ||
563 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
564 av_log(h->avctx, AV_LOG_ERROR,
565 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
566 mmco_index, h->mmco_index, i);
567 return AVERROR_INVALIDDATA;
572 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
575 int current_ref_assigned = 0, err = 0;
576 H264Picture *av_uninit(pic);
578 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
579 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
581 for (i = 0; i < mmco_count; i++) {
582 int av_uninit(structure), av_uninit(frame_num);
583 if (h->avctx->debug & FF_DEBUG_MMCO)
584 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
585 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
587 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
588 mmco[i].opcode == MMCO_SHORT2LONG) {
589 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
590 pic = find_short(h, frame_num, &j);
592 if (mmco[i].opcode != MMCO_SHORT2LONG ||
593 !h->long_ref[mmco[i].long_arg] ||
594 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
595 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
596 err = AVERROR_INVALIDDATA;
602 switch (mmco[i].opcode) {
603 case MMCO_SHORT2UNUSED:
604 if (h->avctx->debug & FF_DEBUG_MMCO)
605 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
606 h->mmco[i].short_pic_num, h->short_ref_count);
607 remove_short(h, frame_num, structure ^ PICT_FRAME);
609 case MMCO_SHORT2LONG:
610 if (h->long_ref[mmco[i].long_arg] != pic)
611 remove_long(h, mmco[i].long_arg, 0);
613 remove_short_at_index(h, j);
614 h->long_ref[ mmco[i].long_arg ] = pic;
615 if (h->long_ref[mmco[i].long_arg]) {
616 h->long_ref[mmco[i].long_arg]->long_ref = 1;
620 case MMCO_LONG2UNUSED:
621 j = pic_num_extract(h, mmco[i].long_arg, &structure);
622 pic = h->long_ref[j];
624 remove_long(h, j, structure ^ PICT_FRAME);
625 } else if (h->avctx->debug & FF_DEBUG_MMCO)
626 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
629 // Comment below left from previous code as it is an interresting note.
630 /* First field in pair is in short term list or
631 * at a different long term index.
632 * This is not allowed; see 7.4.3.3, notes 2 and 3.
633 * Report the problem and keep the pair where it is,
634 * and mark this field valid.
636 if (h->short_ref[0] == h->cur_pic_ptr)
637 remove_short_at_index(h, 0);
639 /* make sure the current picture is not already assigned as a long ref */
640 if (h->cur_pic_ptr->long_ref) {
641 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
642 if (h->long_ref[j] == h->cur_pic_ptr)
643 remove_long(h, j, 0);
648 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
649 remove_long(h, mmco[i].long_arg, 0);
651 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
652 h->long_ref[mmco[i].long_arg]->long_ref = 1;
656 h->cur_pic_ptr->reference |= h->picture_structure;
657 current_ref_assigned = 1;
659 case MMCO_SET_MAX_LONG:
660 assert(mmco[i].long_arg <= 16);
661 // just remove the long term which index is greater than new max
662 for (j = mmco[i].long_arg; j < 16; j++) {
663 remove_long(h, j, 0);
667 while (h->short_ref_count) {
668 remove_short(h, h->short_ref[0]->frame_num, 0);
670 for (j = 0; j < 16; j++) {
671 remove_long(h, j, 0);
673 h->frame_num = h->cur_pic_ptr->frame_num = 0;
675 h->cur_pic_ptr->mmco_reset = 1;
681 if (!current_ref_assigned) {
682 /* Second field of complementary field pair; the first field of
683 * which is already referenced. If short referenced, it
684 * should be first entry in short_ref. If not, it must exist
685 * in long_ref; trying to put it on the short list here is an
686 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
688 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
689 /* Just mark the second field valid */
690 h->cur_pic_ptr->reference = PICT_FRAME;
691 } else if (h->cur_pic_ptr->long_ref) {
692 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
693 "assignment for second field "
694 "in complementary field pair "
695 "(first field is long term)\n");
696 err = AVERROR_INVALIDDATA;
698 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
700 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
701 err = AVERROR_INVALIDDATA;
704 if (h->short_ref_count)
705 memmove(&h->short_ref[1], &h->short_ref[0],
706 h->short_ref_count * sizeof(H264Picture*));
708 h->short_ref[0] = h->cur_pic_ptr;
709 h->short_ref_count++;
710 h->cur_pic_ptr->reference |= h->picture_structure;
714 if (h->long_ref_count + h->short_ref_count -
715 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
717 /* We have too many reference frames, probably due to corrupted
718 * stream. Need to discard one frame. Prevents overrun of the
719 * short_ref and long_ref buffers.
721 av_log(h->avctx, AV_LOG_ERROR,
722 "number of reference frames (%d+%d) exceeds max (%d; probably "
723 "corrupt input), discarding one\n",
724 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
725 err = AVERROR_INVALIDDATA;
727 if (h->long_ref_count && !h->short_ref_count) {
728 for (i = 0; i < 16; ++i)
733 remove_long(h, i, 0);
735 pic = h->short_ref[h->short_ref_count - 1];
736 remove_short(h, pic->frame_num, 0);
742 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
745 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
749 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
752 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
753 skip_bits1(gb); // broken_link
755 mmco[0].opcode = MMCO_LONG;
756 mmco[0].long_arg = 0;
760 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
761 for (i = 0; i < MAX_MMCO_COUNT; i++) {
762 MMCOOpcode opcode = get_ue_golomb_31(gb);
764 mmco[i].opcode = opcode;
765 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
766 mmco[i].short_pic_num =
767 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
768 (h->max_pic_num - 1);
770 if (mmco[i].short_pic_num >= h->short_ref_count ||
771 !h->short_ref[mmco[i].short_pic_num]) {
772 av_log(s->avctx, AV_LOG_ERROR,
773 "illegal short ref in memory management control "
774 "operation %d\n", mmco);
779 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
780 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
781 unsigned int long_arg = get_ue_golomb_31(gb);
782 if (long_arg >= 32 ||
783 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
785 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
786 av_log(h->avctx, AV_LOG_ERROR,
787 "illegal long ref in memory management control "
788 "operation %d\n", opcode);
791 mmco[i].long_arg = long_arg;
794 if (opcode > (unsigned) MMCO_LONG) {
795 av_log(h->avctx, AV_LOG_ERROR,
796 "illegal memory management control operation %d\n",
800 if (opcode == MMCO_END)
806 ret = ff_generate_sliding_window_mmcos(h, first_slice);
807 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
814 if (first_slice && mmco_index != -1) {
815 h->mmco_index = mmco_index;
816 } else if (!first_slice && mmco_index >= 0 &&
817 (mmco_index != h->mmco_index ||
818 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
819 av_log(h->avctx, AV_LOG_ERROR,
820 "Inconsistent MMCO state between slices [%d, %d]\n",
821 mmco_index, h->mmco_index);
822 return AVERROR_INVALIDDATA;