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 / MPEG-4 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 * const *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 * const *src,
101 int len, int limit, int dir)
107 best_poc = dir ? INT_MIN : INT_MAX;
109 for (i = 0; i < len; i++) {
110 const int poc = src[i]->poc;
111 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
113 sorted[out_i] = src[i];
116 if (best_poc == (dir ? INT_MIN : INT_MAX))
118 limit = sorted[out_i++]->poc - dir;
123 static void h264_initialise_ref_list(const H264Context *h, H264SliceContext *sl)
127 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
128 H264Picture *sorted[32];
132 if (FIELD_PICTURE(h))
133 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
135 cur_poc = h->cur_pic_ptr->poc;
137 for (list = 0; list < 2; list++) {
138 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
139 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
142 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
143 sorted, len, 0, h->picture_structure);
144 len += build_def_list(sl->ref_list[list] + len,
145 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
146 h->long_ref, 16, 1, h->picture_structure);
148 if (len < sl->ref_count[list])
149 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
153 if (lens[0] == lens[1] && lens[1] > 1) {
154 for (i = 0; i < lens[0] &&
155 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
156 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
158 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
162 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
163 h->short_ref, h->short_ref_count, 0, h->picture_structure);
164 len += build_def_list(sl->ref_list[0] + len,
165 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
166 h-> long_ref, 16, 1, h->picture_structure);
168 if (len < sl->ref_count[0])
169 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
174 * print short term list
176 static void print_short_term(const H264Context *h)
179 if (h->avctx->debug & FF_DEBUG_MMCO) {
180 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
181 for (i = 0; i < h->short_ref_count; i++) {
182 H264Picture *pic = h->short_ref[i];
183 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
184 i, pic->frame_num, pic->poc, pic->f->data[0]);
190 * print long term list
192 static void print_long_term(const H264Context *h)
195 if (h->avctx->debug & FF_DEBUG_MMCO) {
196 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
197 for (i = 0; i < 16; i++) {
198 H264Picture *pic = h->long_ref[i];
200 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
201 i, pic->frame_num, pic->poc, pic->f->data[0]);
208 * Extract structure information about the picture described by pic_num in
209 * the current decoding context (frame or field). Note that pic_num is
210 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
211 * @param pic_num picture number for which to extract structure information
212 * @param structure one of PICT_XXX describing structure of picture
214 * @return frame number (short term) or long term index of picture
215 * described by pic_num
217 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
219 *structure = h->picture_structure;
220 if (FIELD_PICTURE(h)) {
223 *structure ^= PICT_FRAME;
230 int ff_h264_decode_ref_pic_list_reordering(const H264Context *h, H264SliceContext *sl)
232 int list, index, pic_structure;
237 h264_initialise_ref_list(h, sl);
239 for (list = 0; list < sl->list_count; list++) {
240 if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
241 int pred = h->curr_pic_num;
243 for (index = 0; ; index++) {
244 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
247 H264Picture *ref = NULL;
249 if (modification_of_pic_nums_idc == 3)
252 if (index >= sl->ref_count[list]) {
253 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
257 switch (modification_of_pic_nums_idc) {
260 const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
263 if (abs_diff_pic_num > h->max_pic_num) {
264 av_log(h->avctx, AV_LOG_ERROR,
265 "abs_diff_pic_num overflow\n");
266 return AVERROR_INVALIDDATA;
269 if (modification_of_pic_nums_idc == 0)
270 pred -= abs_diff_pic_num;
272 pred += abs_diff_pic_num;
273 pred &= h->max_pic_num - 1;
275 frame_num = pic_num_extract(h, pred, &pic_structure);
277 for (i = h->short_ref_count - 1; i >= 0; i--) {
278 ref = h->short_ref[i];
279 assert(ref->reference);
280 assert(!ref->long_ref);
281 if (ref->frame_num == frame_num &&
282 (ref->reference & pic_structure))
291 pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
293 long_idx = pic_num_extract(h, pic_id, &pic_structure);
296 av_log(h->avctx, AV_LOG_ERROR,
297 "long_term_pic_idx overflow\n");
298 return AVERROR_INVALIDDATA;
300 ref = h->long_ref[long_idx];
301 assert(!(ref && !ref->reference));
302 if (ref && (ref->reference & pic_structure)) {
303 ref->pic_id = pic_id;
304 assert(ref->long_ref);
312 av_log(h->avctx, AV_LOG_ERROR,
313 "illegal modification_of_pic_nums_idc %u\n",
314 modification_of_pic_nums_idc);
315 return AVERROR_INVALIDDATA;
319 av_log(h->avctx, AV_LOG_ERROR,
320 "reference picture missing during reorder\n");
321 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
323 for (i = index; i + 1 < sl->ref_count[list]; i++) {
324 if (sl->ref_list[list][i].parent &&
325 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
326 ref->pic_id == sl->ref_list[list][i].pic_id)
329 for (; i > index; i--) {
330 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
332 ref_from_h264pic(&sl->ref_list[list][index], ref);
333 if (FIELD_PICTURE(h)) {
334 pic_as_field(&sl->ref_list[list][index], pic_structure);
340 for (list = 0; list < sl->list_count; list++) {
341 for (index = 0; index < sl->ref_count[list]; index++) {
342 if (!sl->ref_list[list][index].parent) {
343 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
344 if (index == 0 || h->avctx->err_recognition & AV_EF_EXPLODE)
345 return AVERROR_INVALIDDATA;
347 sl->ref_list[list][index] = sl->ref_list[list][index - 1];
355 void ff_h264_fill_mbaff_ref_list(H264SliceContext *sl)
358 for (list = 0; list < sl->list_count; list++) { //FIXME try list_count
359 for (i = 0; i < sl->ref_count[list]; i++) {
360 H264Ref *frame = &sl->ref_list[list][i];
361 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
365 for (j = 0; j < 3; j++)
366 field[0].linesize[j] <<= 1;
367 field[0].reference = PICT_TOP_FIELD;
368 field[0].poc = field[0].parent->field_poc[0];
372 for (j = 0; j < 3; j++)
373 field[1].data[j] += frame->parent->f->linesize[j];
374 field[1].reference = PICT_BOTTOM_FIELD;
375 field[1].poc = field[1].parent->field_poc[1];
377 sl->pwt.luma_weight[16 + 2 * i][list][0] = sl->pwt.luma_weight[16 + 2 * i + 1][list][0] = sl->pwt.luma_weight[i][list][0];
378 sl->pwt.luma_weight[16 + 2 * i][list][1] = sl->pwt.luma_weight[16 + 2 * i + 1][list][1] = sl->pwt.luma_weight[i][list][1];
379 for (j = 0; j < 2; j++) {
380 sl->pwt.chroma_weight[16 + 2 * i][list][j][0] = sl->pwt.chroma_weight[16 + 2 * i + 1][list][j][0] = sl->pwt.chroma_weight[i][list][j][0];
381 sl->pwt.chroma_weight[16 + 2 * i][list][j][1] = sl->pwt.chroma_weight[16 + 2 * i + 1][list][j][1] = sl->pwt.chroma_weight[i][list][j][1];
388 * Mark a picture as no longer needed for reference. The refmask
389 * argument allows unreferencing of individual fields or the whole frame.
390 * If the picture becomes entirely unreferenced, but is being held for
391 * display purposes, it is marked as such.
392 * @param refmask mask of fields to unreference; the mask is bitwise
393 * anded with the reference marking of pic
394 * @return non-zero if pic becomes entirely unreferenced (except possibly
395 * for display purposes) zero if one of the fields remains in
398 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
401 if (pic->reference &= refmask) {
404 for(i = 0; h->delayed_pic[i]; i++)
405 if(pic == h->delayed_pic[i]){
406 pic->reference = DELAYED_PIC_REF;
414 * Find a H264Picture in the short term reference list by frame number.
415 * @param frame_num frame number to search for
416 * @param idx the index into h->short_ref where returned picture is found
417 * undefined if no picture found.
418 * @return pointer to the found picture, or NULL if no pic with the provided
419 * frame number is found
421 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
425 for (i = 0; i < h->short_ref_count; i++) {
426 H264Picture *pic = h->short_ref[i];
427 if (h->avctx->debug & FF_DEBUG_MMCO)
428 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
429 if (pic->frame_num == frame_num) {
438 * Remove a picture from the short term reference list by its index in
439 * that list. This does no checking on the provided index; it is assumed
440 * to be valid. Other list entries are shifted down.
441 * @param i index into h->short_ref of picture to remove.
443 static void remove_short_at_index(H264Context *h, int i)
445 assert(i >= 0 && i < h->short_ref_count);
446 h->short_ref[i] = NULL;
447 if (--h->short_ref_count)
448 memmove(&h->short_ref[i], &h->short_ref[i + 1],
449 (h->short_ref_count - i) * sizeof(H264Picture*));
453 * @return the removed picture or NULL if an error occurs
455 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
460 if (h->avctx->debug & FF_DEBUG_MMCO)
461 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
463 pic = find_short(h, frame_num, &i);
465 if (unreference_pic(h, pic, ref_mask))
466 remove_short_at_index(h, i);
473 * Remove a picture from the long term reference list by its index in
475 * @return the removed picture or NULL if an error occurs
477 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
481 pic = h->long_ref[i];
483 if (unreference_pic(h, pic, ref_mask)) {
484 assert(h->long_ref[i]->long_ref == 1);
485 h->long_ref[i]->long_ref = 0;
486 h->long_ref[i] = NULL;
494 void ff_h264_remove_all_refs(H264Context *h)
498 for (i = 0; i < 16; i++) {
499 remove_long(h, i, 0);
501 assert(h->long_ref_count == 0);
503 for (i = 0; i < h->short_ref_count; i++) {
504 unreference_pic(h, h->short_ref[i], 0);
505 h->short_ref[i] = NULL;
507 h->short_ref_count = 0;
510 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
514 for (i = 0; i < n_mmcos; i++) {
515 if (mmco1[i].opcode != mmco2[i].opcode)
522 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
524 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
525 int mmco_index = 0, i = 0;
527 assert(h->long_ref_count + h->short_ref_count <= h->ps.sps->ref_frame_count);
529 if (h->short_ref_count &&
530 h->long_ref_count + h->short_ref_count == h->ps.sps->ref_frame_count &&
531 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
532 mmco[0].opcode = MMCO_SHORT2UNUSED;
533 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
535 if (FIELD_PICTURE(h)) {
536 mmco[0].short_pic_num *= 2;
537 mmco[1].opcode = MMCO_SHORT2UNUSED;
538 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
544 h->mmco_index = mmco_index;
545 } else if (!first_slice && mmco_index >= 0 &&
546 (mmco_index != h->mmco_index ||
547 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
548 av_log(h->avctx, AV_LOG_ERROR,
549 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
550 mmco_index, h->mmco_index, i);
551 return AVERROR_INVALIDDATA;
556 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
559 int current_ref_assigned = 0, err = 0;
560 H264Picture *av_uninit(pic);
562 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
563 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
565 for (i = 0; i < mmco_count; i++) {
566 int av_uninit(structure), av_uninit(frame_num);
567 if (h->avctx->debug & FF_DEBUG_MMCO)
568 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
569 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
571 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
572 mmco[i].opcode == MMCO_SHORT2LONG) {
573 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
574 pic = find_short(h, frame_num, &j);
576 if (mmco[i].opcode != MMCO_SHORT2LONG ||
577 !h->long_ref[mmco[i].long_arg] ||
578 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
579 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
580 err = AVERROR_INVALIDDATA;
586 switch (mmco[i].opcode) {
587 case MMCO_SHORT2UNUSED:
588 if (h->avctx->debug & FF_DEBUG_MMCO)
589 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
590 h->mmco[i].short_pic_num, h->short_ref_count);
591 remove_short(h, frame_num, structure ^ PICT_FRAME);
593 case MMCO_SHORT2LONG:
594 if (h->long_ref[mmco[i].long_arg] != pic)
595 remove_long(h, mmco[i].long_arg, 0);
597 remove_short_at_index(h, j);
598 h->long_ref[ mmco[i].long_arg ] = pic;
599 if (h->long_ref[mmco[i].long_arg]) {
600 h->long_ref[mmco[i].long_arg]->long_ref = 1;
604 case MMCO_LONG2UNUSED:
605 j = pic_num_extract(h, mmco[i].long_arg, &structure);
606 pic = h->long_ref[j];
608 remove_long(h, j, structure ^ PICT_FRAME);
609 } else if (h->avctx->debug & FF_DEBUG_MMCO)
610 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
613 // Comment below left from previous code as it is an interesting note.
614 /* First field in pair is in short term list or
615 * at a different long term index.
616 * This is not allowed; see 7.4.3.3, notes 2 and 3.
617 * Report the problem and keep the pair where it is,
618 * and mark this field valid.
620 if (h->short_ref[0] == h->cur_pic_ptr)
621 remove_short_at_index(h, 0);
623 /* make sure the current picture is not already assigned as a long ref */
624 if (h->cur_pic_ptr->long_ref) {
625 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
626 if (h->long_ref[j] == h->cur_pic_ptr)
627 remove_long(h, j, 0);
632 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
633 remove_long(h, mmco[i].long_arg, 0);
635 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
636 h->long_ref[mmco[i].long_arg]->long_ref = 1;
640 h->cur_pic_ptr->reference |= h->picture_structure;
641 current_ref_assigned = 1;
643 case MMCO_SET_MAX_LONG:
644 assert(mmco[i].long_arg <= 16);
645 // just remove the long term which index is greater than new max
646 for (j = mmco[i].long_arg; j < 16; j++) {
647 remove_long(h, j, 0);
651 while (h->short_ref_count) {
652 remove_short(h, h->short_ref[0]->frame_num, 0);
654 for (j = 0; j < 16; j++) {
655 remove_long(h, j, 0);
657 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
659 h->cur_pic_ptr->mmco_reset = 1;
665 if (!current_ref_assigned) {
666 /* Second field of complementary field pair; the first field of
667 * which is already referenced. If short referenced, it
668 * should be first entry in short_ref. If not, it must exist
669 * in long_ref; trying to put it on the short list here is an
670 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
672 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
673 /* Just mark the second field valid */
674 h->cur_pic_ptr->reference = PICT_FRAME;
675 } else if (h->cur_pic_ptr->long_ref) {
676 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
677 "assignment for second field "
678 "in complementary field pair "
679 "(first field is long term)\n");
680 err = AVERROR_INVALIDDATA;
682 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
684 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
685 err = AVERROR_INVALIDDATA;
688 if (h->short_ref_count)
689 memmove(&h->short_ref[1], &h->short_ref[0],
690 h->short_ref_count * sizeof(H264Picture*));
692 h->short_ref[0] = h->cur_pic_ptr;
693 h->short_ref_count++;
694 h->cur_pic_ptr->reference |= h->picture_structure;
698 if (h->long_ref_count + h->short_ref_count -
699 (h->short_ref[0] == h->cur_pic_ptr) > h->ps.sps->ref_frame_count) {
701 /* We have too many reference frames, probably due to corrupted
702 * stream. Need to discard one frame. Prevents overrun of the
703 * short_ref and long_ref buffers.
705 av_log(h->avctx, AV_LOG_ERROR,
706 "number of reference frames (%d+%d) exceeds max (%d; probably "
707 "corrupt input), discarding one\n",
708 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
709 err = AVERROR_INVALIDDATA;
711 if (h->long_ref_count && !h->short_ref_count) {
712 for (i = 0; i < 16; ++i)
717 remove_long(h, i, 0);
719 pic = h->short_ref[h->short_ref_count - 1];
720 remove_short(h, pic->frame_num, 0);
726 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
729 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
733 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
736 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
737 skip_bits1(gb); // broken_link
739 mmco[0].opcode = MMCO_LONG;
740 mmco[0].long_arg = 0;
744 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
745 for (i = 0; i < MAX_MMCO_COUNT; i++) {
746 MMCOOpcode opcode = get_ue_golomb_31(gb);
748 mmco[i].opcode = opcode;
749 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
750 mmco[i].short_pic_num =
751 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
752 (h->max_pic_num - 1);
754 if (mmco[i].short_pic_num >= h->short_ref_count ||
755 !h->short_ref[mmco[i].short_pic_num]) {
756 av_log(s->avctx, AV_LOG_ERROR,
757 "illegal short ref in memory management control "
758 "operation %d\n", mmco);
763 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
764 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
765 unsigned int long_arg = get_ue_golomb_31(gb);
766 if (long_arg >= 32 ||
767 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
769 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
770 av_log(h->avctx, AV_LOG_ERROR,
771 "illegal long ref in memory management control "
772 "operation %d\n", opcode);
775 mmco[i].long_arg = long_arg;
778 if (opcode > (unsigned) MMCO_LONG) {
779 av_log(h->avctx, AV_LOG_ERROR,
780 "illegal memory management control operation %d\n",
784 if (opcode == MMCO_END)
790 ret = ff_generate_sliding_window_mmcos(h, first_slice);
791 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
798 if (first_slice && mmco_index != -1) {
799 h->mmco_index = mmco_index;
800 } else if (!first_slice && mmco_index >= 0 &&
801 (mmco_index != h->mmco_index ||
802 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
803 av_log(h->avctx, AV_LOG_ERROR,
804 "Inconsistent MMCO state between slices [%d, %d]\n",
805 mmco_index, h->mmco_index);
806 return AVERROR_INVALIDDATA;