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 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
233 for (list = 0; list < sl->list_count; list++) {
234 for (i = 0; i < sl->ref_count[list]; i++) {
235 H264Ref *frame = &sl->ref_list[list][i];
236 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
240 for (j = 0; j < 3; j++)
241 field[0].linesize[j] <<= 1;
242 field[0].reference = PICT_TOP_FIELD;
243 field[0].poc = field[0].parent->field_poc[0];
247 for (j = 0; j < 3; j++)
248 field[1].data[j] += frame->parent->f->linesize[j];
249 field[1].reference = PICT_BOTTOM_FIELD;
250 field[1].poc = field[1].parent->field_poc[1];
255 int ff_h264_build_ref_list(const H264Context *h, H264SliceContext *sl)
257 int list, index, pic_structure;
262 h264_initialise_ref_list(h, sl);
264 for (list = 0; list < sl->list_count; list++) {
265 int pred = h->curr_pic_num;
267 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
268 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
269 unsigned int val = sl->ref_modifications[list][index].val;
272 H264Picture *ref = NULL;
274 switch (modification_of_pic_nums_idc) {
277 const unsigned int abs_diff_pic_num = val + 1;
280 if (abs_diff_pic_num > h->max_pic_num) {
281 av_log(h->avctx, AV_LOG_ERROR,
282 "abs_diff_pic_num overflow\n");
283 return AVERROR_INVALIDDATA;
286 if (modification_of_pic_nums_idc == 0)
287 pred -= abs_diff_pic_num;
289 pred += abs_diff_pic_num;
290 pred &= h->max_pic_num - 1;
292 frame_num = pic_num_extract(h, pred, &pic_structure);
294 for (i = h->short_ref_count - 1; i >= 0; i--) {
295 ref = h->short_ref[i];
296 assert(ref->reference);
297 assert(!ref->long_ref);
298 if (ref->frame_num == frame_num &&
299 (ref->reference & pic_structure))
308 pic_id = val; // long_term_pic_idx
310 long_idx = pic_num_extract(h, pic_id, &pic_structure);
313 av_log(h->avctx, AV_LOG_ERROR,
314 "long_term_pic_idx overflow\n");
315 return AVERROR_INVALIDDATA;
317 ref = h->long_ref[long_idx];
318 assert(!(ref && !ref->reference));
319 if (ref && (ref->reference & pic_structure)) {
320 ref->pic_id = pic_id;
321 assert(ref->long_ref);
331 av_log(h->avctx, AV_LOG_ERROR,
332 "reference picture missing during reorder\n");
333 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
335 for (i = index; i + 1 < sl->ref_count[list]; i++) {
336 if (sl->ref_list[list][i].parent &&
337 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
338 ref->pic_id == sl->ref_list[list][i].pic_id)
341 for (; i > index; i--) {
342 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
344 ref_from_h264pic(&sl->ref_list[list][index], ref);
345 if (FIELD_PICTURE(h)) {
346 pic_as_field(&sl->ref_list[list][index], pic_structure);
351 for (list = 0; list < sl->list_count; list++) {
352 for (index = 0; index < sl->ref_count[list]; index++) {
353 if (!sl->ref_list[list][index].parent) {
354 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
355 if (index == 0 || h->avctx->err_recognition & AV_EF_EXPLODE)
356 return AVERROR_INVALIDDATA;
358 sl->ref_list[list][index] = sl->ref_list[list][index - 1];
364 h264_fill_mbaff_ref_list(sl);
369 int ff_h264_decode_ref_pic_list_reordering(const H264Context *h, H264SliceContext *sl)
373 sl->nb_ref_modifications[0] = 0;
374 sl->nb_ref_modifications[1] = 0;
376 for (list = 0; list < sl->list_count; list++) {
377 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
380 for (index = 0; ; index++) {
381 unsigned int op = get_ue_golomb_31(&sl->gb);
386 if (index >= sl->ref_count[list]) {
387 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
388 return AVERROR_INVALIDDATA;
390 av_log(h->avctx, AV_LOG_ERROR,
391 "illegal modification_of_pic_nums_idc %u\n",
393 return AVERROR_INVALIDDATA;
395 sl->ref_modifications[list][index].val = get_ue_golomb(&sl->gb);
396 sl->ref_modifications[list][index].op = op;
397 sl->nb_ref_modifications[list]++;
405 * Mark a picture as no longer needed for reference. The refmask
406 * argument allows unreferencing of individual fields or the whole frame.
407 * If the picture becomes entirely unreferenced, but is being held for
408 * display purposes, it is marked as such.
409 * @param refmask mask of fields to unreference; the mask is bitwise
410 * anded with the reference marking of pic
411 * @return non-zero if pic becomes entirely unreferenced (except possibly
412 * for display purposes) zero if one of the fields remains in
415 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
418 if (pic->reference &= refmask) {
421 for(i = 0; h->delayed_pic[i]; i++)
422 if(pic == h->delayed_pic[i]){
423 pic->reference = DELAYED_PIC_REF;
431 * Find a H264Picture in the short term reference list by frame number.
432 * @param frame_num frame number to search for
433 * @param idx the index into h->short_ref where returned picture is found
434 * undefined if no picture found.
435 * @return pointer to the found picture, or NULL if no pic with the provided
436 * frame number is found
438 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
442 for (i = 0; i < h->short_ref_count; i++) {
443 H264Picture *pic = h->short_ref[i];
444 if (h->avctx->debug & FF_DEBUG_MMCO)
445 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
446 if (pic->frame_num == frame_num) {
455 * Remove a picture from the short term reference list by its index in
456 * that list. This does no checking on the provided index; it is assumed
457 * to be valid. Other list entries are shifted down.
458 * @param i index into h->short_ref of picture to remove.
460 static void remove_short_at_index(H264Context *h, int i)
462 assert(i >= 0 && i < h->short_ref_count);
463 h->short_ref[i] = NULL;
464 if (--h->short_ref_count)
465 memmove(&h->short_ref[i], &h->short_ref[i + 1],
466 (h->short_ref_count - i) * sizeof(H264Picture*));
470 * @return the removed picture or NULL if an error occurs
472 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
477 if (h->avctx->debug & FF_DEBUG_MMCO)
478 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
480 pic = find_short(h, frame_num, &i);
482 if (unreference_pic(h, pic, ref_mask))
483 remove_short_at_index(h, i);
490 * Remove a picture from the long term reference list by its index in
492 * @return the removed picture or NULL if an error occurs
494 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
498 pic = h->long_ref[i];
500 if (unreference_pic(h, pic, ref_mask)) {
501 assert(h->long_ref[i]->long_ref == 1);
502 h->long_ref[i]->long_ref = 0;
503 h->long_ref[i] = NULL;
511 void ff_h264_remove_all_refs(H264Context *h)
515 for (i = 0; i < 16; i++) {
516 remove_long(h, i, 0);
518 assert(h->long_ref_count == 0);
520 for (i = 0; i < h->short_ref_count; i++) {
521 unreference_pic(h, h->short_ref[i], 0);
522 h->short_ref[i] = NULL;
524 h->short_ref_count = 0;
527 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
531 for (i = 0; i < n_mmcos; i++) {
532 if (mmco1[i].opcode != mmco2[i].opcode)
539 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
541 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
542 int mmco_index = 0, i = 0;
544 assert(h->long_ref_count + h->short_ref_count <= h->ps.sps->ref_frame_count);
546 if (h->short_ref_count &&
547 h->long_ref_count + h->short_ref_count == h->ps.sps->ref_frame_count &&
548 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
549 mmco[0].opcode = MMCO_SHORT2UNUSED;
550 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
552 if (FIELD_PICTURE(h)) {
553 mmco[0].short_pic_num *= 2;
554 mmco[1].opcode = MMCO_SHORT2UNUSED;
555 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
561 h->mmco_index = mmco_index;
562 } else if (!first_slice && mmco_index >= 0 &&
563 (mmco_index != h->mmco_index ||
564 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
565 av_log(h->avctx, AV_LOG_ERROR,
566 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
567 mmco_index, h->mmco_index, i);
568 return AVERROR_INVALIDDATA;
573 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
576 int current_ref_assigned = 0, err = 0;
577 H264Picture *av_uninit(pic);
579 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
580 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
582 for (i = 0; i < mmco_count; i++) {
583 int av_uninit(structure), av_uninit(frame_num);
584 if (h->avctx->debug & FF_DEBUG_MMCO)
585 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
586 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
588 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
589 mmco[i].opcode == MMCO_SHORT2LONG) {
590 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
591 pic = find_short(h, frame_num, &j);
593 if (mmco[i].opcode != MMCO_SHORT2LONG ||
594 !h->long_ref[mmco[i].long_arg] ||
595 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
596 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
597 err = AVERROR_INVALIDDATA;
603 switch (mmco[i].opcode) {
604 case MMCO_SHORT2UNUSED:
605 if (h->avctx->debug & FF_DEBUG_MMCO)
606 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
607 h->mmco[i].short_pic_num, h->short_ref_count);
608 remove_short(h, frame_num, structure ^ PICT_FRAME);
610 case MMCO_SHORT2LONG:
611 if (h->long_ref[mmco[i].long_arg] != pic)
612 remove_long(h, mmco[i].long_arg, 0);
614 remove_short_at_index(h, j);
615 h->long_ref[ mmco[i].long_arg ] = pic;
616 if (h->long_ref[mmco[i].long_arg]) {
617 h->long_ref[mmco[i].long_arg]->long_ref = 1;
621 case MMCO_LONG2UNUSED:
622 j = pic_num_extract(h, mmco[i].long_arg, &structure);
623 pic = h->long_ref[j];
625 remove_long(h, j, structure ^ PICT_FRAME);
626 } else if (h->avctx->debug & FF_DEBUG_MMCO)
627 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
630 // Comment below left from previous code as it is an interesting note.
631 /* First field in pair is in short term list or
632 * at a different long term index.
633 * This is not allowed; see 7.4.3.3, notes 2 and 3.
634 * Report the problem and keep the pair where it is,
635 * and mark this field valid.
637 if (h->short_ref[0] == h->cur_pic_ptr)
638 remove_short_at_index(h, 0);
640 /* make sure the current picture is not already assigned as a long ref */
641 if (h->cur_pic_ptr->long_ref) {
642 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
643 if (h->long_ref[j] == h->cur_pic_ptr)
644 remove_long(h, j, 0);
649 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
650 remove_long(h, mmco[i].long_arg, 0);
652 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
653 h->long_ref[mmco[i].long_arg]->long_ref = 1;
657 h->cur_pic_ptr->reference |= h->picture_structure;
658 current_ref_assigned = 1;
660 case MMCO_SET_MAX_LONG:
661 assert(mmco[i].long_arg <= 16);
662 // just remove the long term which index is greater than new max
663 for (j = mmco[i].long_arg; j < 16; j++) {
664 remove_long(h, j, 0);
668 while (h->short_ref_count) {
669 remove_short(h, h->short_ref[0]->frame_num, 0);
671 for (j = 0; j < 16; j++) {
672 remove_long(h, j, 0);
674 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
676 h->cur_pic_ptr->mmco_reset = 1;
682 if (!current_ref_assigned) {
683 /* Second field of complementary field pair; the first field of
684 * which is already referenced. If short referenced, it
685 * should be first entry in short_ref. If not, it must exist
686 * in long_ref; trying to put it on the short list here is an
687 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
689 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
690 /* Just mark the second field valid */
691 h->cur_pic_ptr->reference = PICT_FRAME;
692 } else if (h->cur_pic_ptr->long_ref) {
693 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
694 "assignment for second field "
695 "in complementary field pair "
696 "(first field is long term)\n");
697 err = AVERROR_INVALIDDATA;
699 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
701 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
702 err = AVERROR_INVALIDDATA;
705 if (h->short_ref_count)
706 memmove(&h->short_ref[1], &h->short_ref[0],
707 h->short_ref_count * sizeof(H264Picture*));
709 h->short_ref[0] = h->cur_pic_ptr;
710 h->short_ref_count++;
711 h->cur_pic_ptr->reference |= h->picture_structure;
715 if (h->long_ref_count + h->short_ref_count -
716 (h->short_ref[0] == h->cur_pic_ptr) > h->ps.sps->ref_frame_count) {
718 /* We have too many reference frames, probably due to corrupted
719 * stream. Need to discard one frame. Prevents overrun of the
720 * short_ref and long_ref buffers.
722 av_log(h->avctx, AV_LOG_ERROR,
723 "number of reference frames (%d+%d) exceeds max (%d; probably "
724 "corrupt input), discarding one\n",
725 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
726 err = AVERROR_INVALIDDATA;
728 if (h->long_ref_count && !h->short_ref_count) {
729 for (i = 0; i < 16; ++i)
734 remove_long(h, i, 0);
736 pic = h->short_ref[h->short_ref_count - 1];
737 remove_short(h, pic->frame_num, 0);
743 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
746 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
750 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
753 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
754 skip_bits1(gb); // broken_link
756 mmco[0].opcode = MMCO_LONG;
757 mmco[0].long_arg = 0;
761 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
762 for (i = 0; i < MAX_MMCO_COUNT; i++) {
763 MMCOOpcode opcode = get_ue_golomb_31(gb);
765 mmco[i].opcode = opcode;
766 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
767 mmco[i].short_pic_num =
768 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
769 (h->max_pic_num - 1);
771 if (mmco[i].short_pic_num >= h->short_ref_count ||
772 !h->short_ref[mmco[i].short_pic_num]) {
773 av_log(s->avctx, AV_LOG_ERROR,
774 "illegal short ref in memory management control "
775 "operation %d\n", mmco);
780 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
781 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
782 unsigned int long_arg = get_ue_golomb_31(gb);
783 if (long_arg >= 32 ||
784 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
786 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
787 av_log(h->avctx, AV_LOG_ERROR,
788 "illegal long ref in memory management control "
789 "operation %d\n", opcode);
792 mmco[i].long_arg = long_arg;
795 if (opcode > (unsigned) MMCO_LONG) {
796 av_log(h->avctx, AV_LOG_ERROR,
797 "illegal memory management control operation %d\n",
801 if (opcode == MMCO_END)
807 ret = ff_generate_sliding_window_mmcos(h, first_slice);
808 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
815 if (first_slice && mmco_index != -1) {
816 h->mmco_index = mmco_index;
817 } else if (!first_slice && mmco_index >= 0 &&
818 (mmco_index != h->mmco_index ||
819 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
820 av_log(h->avctx, AV_LOG_ERROR,
821 "Inconsistent MMCO state between slices [%d, %d]\n",
822 mmco_index, h->mmco_index);
823 return AVERROR_INVALIDDATA;