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>
35 #define COPY_PICTURE(dst, src) \
38 (dst)->f.extended_data = (dst)->f.data;\
39 (dst)->tf.f = &(dst)->f;\
43 static void pic_as_field(Picture *pic, const int parity){
45 for (i = 0; i < 4; ++i) {
46 if (parity == PICT_BOTTOM_FIELD)
47 pic->f.data[i] += pic->f.linesize[i];
48 pic->reference = parity;
49 pic->f.linesize[i] *= 2;
51 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
54 static int split_field_copy(Picture *dest, Picture *src, int parity, int id_add)
56 int match = !!(src->reference & parity);
59 COPY_PICTURE(dest, src);
60 if (parity != PICT_FRAME) {
61 pic_as_field(dest, parity);
63 dest->pic_id += id_add;
70 static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel)
75 while (i[0] < len || i[1] < len) {
76 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
78 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
81 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
82 split_field_copy(&def[index++], in[i[0]++], sel, 1);
85 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
86 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
93 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir)
99 best_poc = dir ? INT_MIN : INT_MAX;
101 for (i = 0; i < len; i++) {
102 const int poc = src[i]->poc;
103 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
105 sorted[out_i] = src[i];
108 if (best_poc == (dir ? INT_MIN : INT_MAX))
110 limit = sorted[out_i++]->poc - dir;
115 int ff_h264_fill_default_ref_list(H264Context *h)
119 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
124 if (FIELD_PICTURE(h))
125 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
127 cur_poc = h->cur_pic_ptr->poc;
129 for (list = 0; list < 2; list++) {
130 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
131 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
133 len = build_def_list(h->default_ref_list[list], sorted, len, 0, h->picture_structure);
134 len += build_def_list(h->default_ref_list[list] + len, h->long_ref, 16, 1, h->picture_structure);
137 if (len < h->ref_count[list])
138 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
142 if (lens[0] == lens[1] && lens[1] > 1) {
143 for (i = 0; h->default_ref_list[0][i].f.data[0] == h->default_ref_list[1][i].f.data[0] && i < lens[0]; i++);
146 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
147 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
148 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
152 len = build_def_list(h->default_ref_list[0], h->short_ref, h->short_ref_count, 0, h->picture_structure);
153 len += build_def_list(h->default_ref_list[0] + len, h-> long_ref, 16, 1, h->picture_structure);
155 if (len < h->ref_count[0])
156 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
159 for (i = 0; i < h->ref_count[0]; i++) {
160 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
161 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
162 h->default_ref_list[0][i].pic_id,
163 h->default_ref_list[0][i].f.data[0]);
165 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
166 for (i = 0; i < h->ref_count[1]; i++) {
167 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
168 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
169 h->default_ref_list[1][i].pic_id,
170 h->default_ref_list[1][i].f.data[0]);
177 static void print_short_term(H264Context *h);
178 static void print_long_term(H264Context *h);
181 * Extract structure information about the picture described by pic_num in
182 * the current decoding context (frame or field). Note that pic_num is
183 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
184 * @param pic_num picture number for which to extract structure information
185 * @param structure one of PICT_XXX describing structure of picture
187 * @return frame number (short term) or long term index of picture
188 * described by pic_num
190 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
192 *structure = h->picture_structure;
193 if (FIELD_PICTURE(h)) {
196 *structure ^= PICT_FRAME;
203 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
205 int list, index, pic_structure, i;
210 for (list = 0; list < h->list_count; list++) {
211 for (i = 0; i < h->ref_count[list]; i++)
212 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
214 if (get_bits1(&h->gb)) {
215 int pred = h->curr_pic_num;
217 for (index = 0; ; index++) {
218 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
223 if (reordering_of_pic_nums_idc == 3)
226 if (index >= h->ref_count[list]) {
227 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
231 if (reordering_of_pic_nums_idc < 3) {
232 if (reordering_of_pic_nums_idc < 2) {
233 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
236 if (abs_diff_pic_num > h->max_pic_num) {
237 av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
241 if (reordering_of_pic_nums_idc == 0)
242 pred -= abs_diff_pic_num;
244 pred += abs_diff_pic_num;
245 pred &= h->max_pic_num - 1;
247 frame_num = pic_num_extract(h, pred, &pic_structure);
249 for (i = h->short_ref_count - 1; i >= 0; i--) {
250 ref = h->short_ref[i];
251 assert(ref->reference);
252 assert(!ref->long_ref);
253 if (ref->frame_num == frame_num &&
254 (ref->reference & pic_structure))
261 pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx
263 long_idx = pic_num_extract(h, pic_id, &pic_structure);
266 av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
269 ref = h->long_ref[long_idx];
270 assert(!(ref && !ref->reference));
271 if (ref && (ref->reference & pic_structure)) {
272 ref->pic_id = pic_id;
273 assert(ref->long_ref);
281 av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
282 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
284 for (i = index; i + 1 < h->ref_count[list]; i++) {
285 if (ref->long_ref == h->ref_list[list][i].long_ref &&
286 ref->pic_id == h->ref_list[list][i].pic_id)
289 for (; i > index; i--) {
290 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
292 COPY_PICTURE(&h->ref_list[list][index], ref);
293 if (FIELD_PICTURE(h)) {
294 pic_as_field(&h->ref_list[list][index], pic_structure);
298 av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
304 for (list = 0; list < h->list_count; list++) {
305 for (index = 0; index < h->ref_count[list]; index++) {
306 if (!h->ref_list[list][index].f.data[0]) {
307 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
308 if (h->default_ref_list[list][0].f.data[0])
309 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
319 void ff_h264_fill_mbaff_ref_list(H264Context *h)
322 for (list = 0; list < 2; list++) { //FIXME try list_count
323 for (i = 0; i < h->ref_count[list]; i++) {
324 Picture *frame = &h->ref_list[list][i];
325 Picture *field = &h->ref_list[list][16 + 2 * i];
326 COPY_PICTURE(field, frame);
327 for (j = 0; j < 3; j++)
328 field[0].f.linesize[j] <<= 1;
329 field[0].reference = PICT_TOP_FIELD;
330 field[0].poc = field[0].field_poc[0];
331 COPY_PICTURE(field + 1, field);
332 for (j = 0; j < 3; j++)
333 field[1].f.data[j] += frame->f.linesize[j];
334 field[1].reference = PICT_BOTTOM_FIELD;
335 field[1].poc = field[1].field_poc[1];
337 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
338 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
339 for (j = 0; j < 2; j++) {
340 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];
341 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];
348 * Mark a picture as no longer needed for reference. The refmask
349 * argument allows unreferencing of individual fields or the whole frame.
350 * If the picture becomes entirely unreferenced, but is being held for
351 * display purposes, it is marked as such.
352 * @param refmask mask of fields to unreference; the mask is bitwise
353 * anded with the reference marking of pic
354 * @return non-zero if pic becomes entirely unreferenced (except possibly
355 * for display purposes) zero if one of the fields remains in
358 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
361 if (pic->reference &= refmask) {
364 for(i = 0; h->delayed_pic[i]; i++)
365 if(pic == h->delayed_pic[i]){
366 pic->reference = DELAYED_PIC_REF;
374 * Find a Picture in the short term reference list by frame number.
375 * @param frame_num frame number to search for
376 * @param idx the index into h->short_ref where returned picture is found
377 * undefined if no picture found.
378 * @return pointer to the found picture, or NULL if no pic with the provided
379 * frame number is found
381 static Picture *find_short(H264Context *h, int frame_num, int *idx)
385 for (i = 0; i < h->short_ref_count; i++) {
386 Picture *pic = h->short_ref[i];
387 if (h->avctx->debug & FF_DEBUG_MMCO)
388 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
389 if (pic->frame_num == frame_num) {
398 * Remove a picture from the short term reference list by its index in
399 * that list. This does no checking on the provided index; it is assumed
400 * to be valid. Other list entries are shifted down.
401 * @param i index into h->short_ref of picture to remove.
403 static void remove_short_at_index(H264Context *h, int i)
405 assert(i >= 0 && i < h->short_ref_count);
406 h->short_ref[i] = NULL;
407 if (--h->short_ref_count)
408 memmove(&h->short_ref[i], &h->short_ref[i + 1],
409 (h->short_ref_count - i) * sizeof(Picture*));
414 * @return the removed picture or NULL if an error occurs
416 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
421 if (h->avctx->debug & FF_DEBUG_MMCO)
422 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
424 pic = find_short(h, frame_num, &i);
426 if (unreference_pic(h, pic, ref_mask))
427 remove_short_at_index(h, i);
434 * Remove a picture from the long term reference list by its index in
436 * @return the removed picture or NULL if an error occurs
438 static Picture *remove_long(H264Context *h, int i, int ref_mask)
442 pic = h->long_ref[i];
444 if (unreference_pic(h, pic, ref_mask)) {
445 assert(h->long_ref[i]->long_ref == 1);
446 h->long_ref[i]->long_ref = 0;
447 h->long_ref[i] = NULL;
455 void ff_h264_remove_all_refs(H264Context *h)
459 for (i = 0; i < 16; i++) {
460 remove_long(h, i, 0);
462 assert(h->long_ref_count == 0);
464 for (i = 0; i < h->short_ref_count; i++) {
465 unreference_pic(h, h->short_ref[i], 0);
466 h->short_ref[i] = NULL;
468 h->short_ref_count = 0;
472 * print short term list
474 static void print_short_term(H264Context *h)
477 if (h->avctx->debug & FF_DEBUG_MMCO) {
478 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
479 for (i = 0; i < h->short_ref_count; i++) {
480 Picture *pic = h->short_ref[i];
481 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
482 i, pic->frame_num, pic->poc, pic->f.data[0]);
488 * print long term list
490 static void print_long_term(H264Context *h)
493 if (h->avctx->debug & FF_DEBUG_MMCO) {
494 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
495 for (i = 0; i < 16; i++) {
496 Picture *pic = h->long_ref[i];
498 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
499 i, pic->frame_num, pic->poc, pic->f.data[0]);
505 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
509 for (i = 0; i < n_mmcos; i++) {
510 if (mmco1[i].opcode != mmco2[i].opcode)
517 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
519 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
520 int mmco_index = 0, i;
522 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
524 if (h->short_ref_count &&
525 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
526 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
527 mmco[0].opcode = MMCO_SHORT2UNUSED;
528 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
530 if (FIELD_PICTURE(h)) {
531 mmco[0].short_pic_num *= 2;
532 mmco[1].opcode = MMCO_SHORT2UNUSED;
533 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
539 h->mmco_index = mmco_index;
540 } else if (!first_slice && mmco_index >= 0 &&
541 (mmco_index != h->mmco_index ||
542 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
543 av_log(h->avctx, AV_LOG_ERROR,
544 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
545 mmco_index, h->mmco_index, i);
546 return AVERROR_INVALIDDATA;
551 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
554 int current_ref_assigned = 0, err = 0;
555 Picture *av_uninit(pic);
557 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
558 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
560 for (i = 0; i < mmco_count; i++) {
561 int av_uninit(structure), av_uninit(frame_num);
562 if (h->avctx->debug & FF_DEBUG_MMCO)
563 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
564 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
566 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
567 mmco[i].opcode == MMCO_SHORT2LONG) {
568 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
569 pic = find_short(h, frame_num, &j);
571 if (mmco[i].opcode != MMCO_SHORT2LONG ||
572 !h->long_ref[mmco[i].long_arg] ||
573 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
574 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
575 err = AVERROR_INVALIDDATA;
581 switch (mmco[i].opcode) {
582 case MMCO_SHORT2UNUSED:
583 if (h->avctx->debug & FF_DEBUG_MMCO)
584 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
585 h->mmco[i].short_pic_num, h->short_ref_count);
586 remove_short(h, frame_num, structure ^ PICT_FRAME);
588 case MMCO_SHORT2LONG:
589 if (h->long_ref[mmco[i].long_arg] != pic)
590 remove_long(h, mmco[i].long_arg, 0);
592 remove_short_at_index(h, j);
593 h->long_ref[ mmco[i].long_arg ] = pic;
594 if (h->long_ref[mmco[i].long_arg]) {
595 h->long_ref[mmco[i].long_arg]->long_ref = 1;
599 case MMCO_LONG2UNUSED:
600 j = pic_num_extract(h, mmco[i].long_arg, &structure);
601 pic = h->long_ref[j];
603 remove_long(h, j, structure ^ PICT_FRAME);
604 } else if (h->avctx->debug & FF_DEBUG_MMCO)
605 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
608 // Comment below left from previous code as it is an interresting note.
609 /* First field in pair is in short term list or
610 * at a different long term index.
611 * This is not allowed; see 7.4.3.3, notes 2 and 3.
612 * Report the problem and keep the pair where it is,
613 * and mark this field valid.
616 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
617 remove_long(h, mmco[i].long_arg, 0);
619 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
620 h->long_ref[mmco[i].long_arg]->long_ref = 1;
624 h->cur_pic_ptr->reference |= h->picture_structure;
625 current_ref_assigned = 1;
627 case MMCO_SET_MAX_LONG:
628 assert(mmco[i].long_arg <= 16);
629 // just remove the long term which index is greater than new max
630 for (j = mmco[i].long_arg; j < 16; j++) {
631 remove_long(h, j, 0);
635 while (h->short_ref_count) {
636 remove_short(h, h->short_ref[0]->frame_num, 0);
638 for (j = 0; j < 16; j++) {
639 remove_long(h, j, 0);
641 h->frame_num = h->cur_pic_ptr->frame_num = 0;
643 h->cur_pic_ptr->mmco_reset = 1;
649 if (!current_ref_assigned) {
650 /* Second field of complementary field pair; the first field of
651 * which is already referenced. If short referenced, it
652 * should be first entry in short_ref. If not, it must exist
653 * in long_ref; trying to put it on the short list here is an
654 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
656 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
657 /* Just mark the second field valid */
658 h->cur_pic_ptr->reference = PICT_FRAME;
659 } else if (h->cur_pic_ptr->long_ref) {
660 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
661 "assignment for second field "
662 "in complementary field pair "
663 "(first field is long term)\n");
664 err = AVERROR_INVALIDDATA;
666 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
668 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
669 err = AVERROR_INVALIDDATA;
672 if (h->short_ref_count)
673 memmove(&h->short_ref[1], &h->short_ref[0],
674 h->short_ref_count * sizeof(Picture*));
676 h->short_ref[0] = h->cur_pic_ptr;
677 h->short_ref_count++;
678 h->cur_pic_ptr->reference |= h->picture_structure;
682 if (h->long_ref_count + h->short_ref_count -
683 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
685 /* We have too many reference frames, probably due to corrupted
686 * stream. Need to discard one frame. Prevents overrun of the
687 * short_ref and long_ref buffers.
689 av_log(h->avctx, AV_LOG_ERROR,
690 "number of reference frames (%d+%d) exceeds max (%d; probably "
691 "corrupt input), discarding one\n",
692 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
693 err = AVERROR_INVALIDDATA;
695 if (h->long_ref_count && !h->short_ref_count) {
696 for (i = 0; i < 16; ++i)
701 remove_long(h, i, 0);
703 pic = h->short_ref[h->short_ref_count - 1];
704 remove_short(h, pic->frame_num, 0);
710 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
713 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
717 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
720 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
721 skip_bits1(gb); // broken_link
723 mmco[0].opcode = MMCO_LONG;
724 mmco[0].long_arg = 0;
728 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
729 for (i = 0; i < MAX_MMCO_COUNT; i++) {
730 MMCOOpcode opcode = get_ue_golomb_31(gb);
732 mmco[i].opcode = opcode;
733 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
734 mmco[i].short_pic_num =
735 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
736 (h->max_pic_num - 1);
738 if (mmco[i].short_pic_num >= h->short_ref_count ||
739 h->short_ref[ mmco[i].short_pic_num ] == NULL){
740 av_log(s->avctx, AV_LOG_ERROR,
741 "illegal short ref in memory management control "
742 "operation %d\n", mmco);
747 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
748 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
749 unsigned int long_arg = get_ue_golomb_31(gb);
750 if (long_arg >= 32 ||
751 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
753 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
754 av_log(h->avctx, AV_LOG_ERROR,
755 "illegal long ref in memory management control "
756 "operation %d\n", opcode);
759 mmco[i].long_arg = long_arg;
762 if (opcode > (unsigned) MMCO_LONG) {
763 av_log(h->avctx, AV_LOG_ERROR,
764 "illegal memory management control operation %d\n",
768 if (opcode == MMCO_END)
774 ret = ff_generate_sliding_window_mmcos(h, first_slice);
775 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
782 if (first_slice && mmco_index != -1) {
783 h->mmco_index = mmco_index;
784 } else if (!first_slice && mmco_index >= 0 &&
785 (mmco_index != h->mmco_index ||
786 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
787 av_log(h->avctx, AV_LOG_ERROR,
788 "Inconsistent MMCO state between slices [%d, %d]\n",
789 mmco_index, h->mmco_index);
790 return AVERROR_INVALIDDATA;