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>
36 #define COPY_PICTURE(dst, src) \
39 (dst)->f.extended_data = (dst)->f.data;\
40 (dst)->tf.f = &(dst)->f;\
44 static void pic_as_field(Picture *pic, const int parity){
46 for (i = 0; i < 4; ++i) {
47 if (parity == PICT_BOTTOM_FIELD)
48 pic->f.data[i] += pic->f.linesize[i];
49 pic->reference = parity;
50 pic->f.linesize[i] *= 2;
52 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
55 static int split_field_copy(Picture *dest, Picture *src, int parity, int id_add)
57 int match = !!(src->reference & parity);
60 COPY_PICTURE(dest, src);
61 if (parity != PICT_FRAME) {
62 pic_as_field(dest, parity);
64 dest->pic_id += id_add;
71 static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel)
76 while (i[0] < len || i[1] < len) {
77 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
79 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
82 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
83 split_field_copy(&def[index++], in[i[0]++], sel, 1);
86 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
87 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
94 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir)
100 best_poc = dir ? INT_MIN : INT_MAX;
102 for (i = 0; i < len; i++) {
103 const int poc = src[i]->poc;
104 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
106 sorted[out_i] = src[i];
109 if (best_poc == (dir ? INT_MIN : INT_MAX))
111 limit = sorted[out_i++]->poc - dir;
116 int ff_h264_fill_default_ref_list(H264Context *h)
120 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
125 if (FIELD_PICTURE(h))
126 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
128 cur_poc = h->cur_pic_ptr->poc;
130 for (list = 0; list < 2; list++) {
131 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
132 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
134 len = build_def_list(h->default_ref_list[list], sorted, len, 0, h->picture_structure);
135 len += build_def_list(h->default_ref_list[list] + len, h->long_ref, 16, 1, h->picture_structure);
138 if (len < h->ref_count[list])
139 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
143 if (lens[0] == lens[1] && lens[1] > 1) {
144 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++);
147 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
148 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
149 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
153 len = build_def_list(h->default_ref_list[0], h->short_ref, h->short_ref_count, 0, h->picture_structure);
154 len += build_def_list(h->default_ref_list[0] + len, h-> long_ref, 16, 1, h->picture_structure);
156 if (len < h->ref_count[0])
157 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
160 for (i = 0; i < h->ref_count[0]; i++) {
161 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
162 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
163 h->default_ref_list[0][i].pic_id,
164 h->default_ref_list[0][i].f.data[0]);
166 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
167 for (i = 0; i < h->ref_count[1]; i++) {
168 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
169 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
170 h->default_ref_list[1][i].pic_id,
171 h->default_ref_list[1][i].f.data[0]);
178 static void print_short_term(H264Context *h);
179 static void print_long_term(H264Context *h);
182 * Extract structure information about the picture described by pic_num in
183 * the current decoding context (frame or field). Note that pic_num is
184 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
185 * @param pic_num picture number for which to extract structure information
186 * @param structure one of PICT_XXX describing structure of picture
188 * @return frame number (short term) or long term index of picture
189 * described by pic_num
191 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
193 *structure = h->picture_structure;
194 if (FIELD_PICTURE(h)) {
197 *structure ^= PICT_FRAME;
204 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
206 int list, index, pic_structure, i;
211 for (list = 0; list < h->list_count; list++) {
212 for (i = 0; i < h->ref_count[list]; i++)
213 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
215 if (get_bits1(&h->gb)) {
216 int pred = h->curr_pic_num;
218 for (index = 0; ; index++) {
219 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
224 if (reordering_of_pic_nums_idc == 3)
227 if (index >= h->ref_count[list]) {
228 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
232 if (reordering_of_pic_nums_idc < 3) {
233 if (reordering_of_pic_nums_idc < 2) {
234 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
237 if (abs_diff_pic_num > h->max_pic_num) {
238 av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
242 if (reordering_of_pic_nums_idc == 0)
243 pred -= abs_diff_pic_num;
245 pred += abs_diff_pic_num;
246 pred &= h->max_pic_num - 1;
248 frame_num = pic_num_extract(h, pred, &pic_structure);
250 for (i = h->short_ref_count - 1; i >= 0; i--) {
251 ref = h->short_ref[i];
252 assert(ref->reference);
253 assert(!ref->long_ref);
254 if (ref->frame_num == frame_num &&
255 (ref->reference & pic_structure))
262 pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx
264 long_idx = pic_num_extract(h, pic_id, &pic_structure);
267 av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
270 ref = h->long_ref[long_idx];
271 assert(!(ref && !ref->reference));
272 if (ref && (ref->reference & pic_structure)) {
273 ref->pic_id = pic_id;
274 assert(ref->long_ref);
282 av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
283 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
285 for (i = index; i + 1 < h->ref_count[list]; i++) {
286 if (ref->long_ref == h->ref_list[list][i].long_ref &&
287 ref->pic_id == h->ref_list[list][i].pic_id)
290 for (; i > index; i--) {
291 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
293 COPY_PICTURE(&h->ref_list[list][index], ref);
294 if (FIELD_PICTURE(h)) {
295 pic_as_field(&h->ref_list[list][index], pic_structure);
299 av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
305 for (list = 0; list < h->list_count; list++) {
306 for (index = 0; index < h->ref_count[list]; index++) {
307 if (!h->ref_list[list][index].f.data[0]) {
308 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
309 if (h->default_ref_list[list][0].f.data[0])
310 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
320 void ff_h264_fill_mbaff_ref_list(H264Context *h)
323 for (list = 0; list < 2; list++) { //FIXME try list_count
324 for (i = 0; i < h->ref_count[list]; i++) {
325 Picture *frame = &h->ref_list[list][i];
326 Picture *field = &h->ref_list[list][16 + 2 * i];
327 COPY_PICTURE(field, frame);
328 for (j = 0; j < 3; j++)
329 field[0].f.linesize[j] <<= 1;
330 field[0].reference = PICT_TOP_FIELD;
331 field[0].poc = field[0].field_poc[0];
332 COPY_PICTURE(field + 1, field);
333 for (j = 0; j < 3; j++)
334 field[1].f.data[j] += frame->f.linesize[j];
335 field[1].reference = PICT_BOTTOM_FIELD;
336 field[1].poc = field[1].field_poc[1];
338 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
339 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
340 for (j = 0; j < 2; j++) {
341 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];
342 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];
349 * Mark a picture as no longer needed for reference. The refmask
350 * argument allows unreferencing of individual fields or the whole frame.
351 * If the picture becomes entirely unreferenced, but is being held for
352 * display purposes, it is marked as such.
353 * @param refmask mask of fields to unreference; the mask is bitwise
354 * anded with the reference marking of pic
355 * @return non-zero if pic becomes entirely unreferenced (except possibly
356 * for display purposes) zero if one of the fields remains in
359 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
362 if (pic->reference &= refmask) {
365 for(i = 0; h->delayed_pic[i]; i++)
366 if(pic == h->delayed_pic[i]){
367 pic->reference = DELAYED_PIC_REF;
375 * Find a Picture in the short term reference list by frame number.
376 * @param frame_num frame number to search for
377 * @param idx the index into h->short_ref where returned picture is found
378 * undefined if no picture found.
379 * @return pointer to the found picture, or NULL if no pic with the provided
380 * frame number is found
382 static Picture *find_short(H264Context *h, int frame_num, int *idx)
386 for (i = 0; i < h->short_ref_count; i++) {
387 Picture *pic = h->short_ref[i];
388 if (h->avctx->debug & FF_DEBUG_MMCO)
389 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
390 if (pic->frame_num == frame_num) {
399 * Remove a picture from the short term reference list by its index in
400 * that list. This does no checking on the provided index; it is assumed
401 * to be valid. Other list entries are shifted down.
402 * @param i index into h->short_ref of picture to remove.
404 static void remove_short_at_index(H264Context *h, int i)
406 assert(i >= 0 && i < h->short_ref_count);
407 h->short_ref[i] = NULL;
408 if (--h->short_ref_count)
409 memmove(&h->short_ref[i], &h->short_ref[i + 1],
410 (h->short_ref_count - i) * sizeof(Picture*));
415 * @return the removed picture or NULL if an error occurs
417 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
422 if (h->avctx->debug & FF_DEBUG_MMCO)
423 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
425 pic = find_short(h, frame_num, &i);
427 if (unreference_pic(h, pic, ref_mask))
428 remove_short_at_index(h, i);
435 * Remove a picture from the long term reference list by its index in
437 * @return the removed picture or NULL if an error occurs
439 static Picture *remove_long(H264Context *h, int i, int ref_mask)
443 pic = h->long_ref[i];
445 if (unreference_pic(h, pic, ref_mask)) {
446 assert(h->long_ref[i]->long_ref == 1);
447 h->long_ref[i]->long_ref = 0;
448 h->long_ref[i] = NULL;
456 void ff_h264_remove_all_refs(H264Context *h)
460 for (i = 0; i < 16; i++) {
461 remove_long(h, i, 0);
463 assert(h->long_ref_count == 0);
465 for (i = 0; i < h->short_ref_count; i++) {
466 unreference_pic(h, h->short_ref[i], 0);
467 h->short_ref[i] = NULL;
469 h->short_ref_count = 0;
473 * print short term list
475 static void print_short_term(H264Context *h)
478 if (h->avctx->debug & FF_DEBUG_MMCO) {
479 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
480 for (i = 0; i < h->short_ref_count; i++) {
481 Picture *pic = h->short_ref[i];
482 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
483 i, pic->frame_num, pic->poc, pic->f.data[0]);
489 * print long term list
491 static void print_long_term(H264Context *h)
494 if (h->avctx->debug & FF_DEBUG_MMCO) {
495 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
496 for (i = 0; i < 16; i++) {
497 Picture *pic = h->long_ref[i];
499 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
500 i, pic->frame_num, pic->poc, pic->f.data[0]);
506 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
510 for (i = 0; i < n_mmcos; i++) {
511 if (mmco1[i].opcode != mmco2[i].opcode)
518 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
520 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
521 int mmco_index = 0, i;
523 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
525 if (h->short_ref_count &&
526 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
527 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
528 mmco[0].opcode = MMCO_SHORT2UNUSED;
529 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
531 if (FIELD_PICTURE(h)) {
532 mmco[0].short_pic_num *= 2;
533 mmco[1].opcode = MMCO_SHORT2UNUSED;
534 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
540 h->mmco_index = mmco_index;
541 } else if (!first_slice && mmco_index >= 0 &&
542 (mmco_index != h->mmco_index ||
543 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
544 av_log(h->avctx, AV_LOG_ERROR,
545 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
546 mmco_index, h->mmco_index, i);
547 return AVERROR_INVALIDDATA;
552 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
555 int current_ref_assigned = 0, err = 0;
556 Picture *av_uninit(pic);
558 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
559 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
561 for (i = 0; i < mmco_count; i++) {
562 int av_uninit(structure), av_uninit(frame_num);
563 if (h->avctx->debug & FF_DEBUG_MMCO)
564 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
565 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
567 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
568 mmco[i].opcode == MMCO_SHORT2LONG) {
569 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
570 pic = find_short(h, frame_num, &j);
572 if (mmco[i].opcode != MMCO_SHORT2LONG ||
573 !h->long_ref[mmco[i].long_arg] ||
574 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
575 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
576 err = AVERROR_INVALIDDATA;
582 switch (mmco[i].opcode) {
583 case MMCO_SHORT2UNUSED:
584 if (h->avctx->debug & FF_DEBUG_MMCO)
585 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
586 h->mmco[i].short_pic_num, h->short_ref_count);
587 remove_short(h, frame_num, structure ^ PICT_FRAME);
589 case MMCO_SHORT2LONG:
590 if (h->long_ref[mmco[i].long_arg] != pic)
591 remove_long(h, mmco[i].long_arg, 0);
593 remove_short_at_index(h, j);
594 h->long_ref[ mmco[i].long_arg ] = pic;
595 if (h->long_ref[mmco[i].long_arg]) {
596 h->long_ref[mmco[i].long_arg]->long_ref = 1;
600 case MMCO_LONG2UNUSED:
601 j = pic_num_extract(h, mmco[i].long_arg, &structure);
602 pic = h->long_ref[j];
604 remove_long(h, j, structure ^ PICT_FRAME);
605 } else if (h->avctx->debug & FF_DEBUG_MMCO)
606 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
609 // Comment below left from previous code as it is an interresting note.
610 /* First field in pair is in short term list or
611 * at a different long term index.
612 * This is not allowed; see 7.4.3.3, notes 2 and 3.
613 * Report the problem and keep the pair where it is,
614 * and mark this field valid.
617 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
618 remove_long(h, mmco[i].long_arg, 0);
620 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
621 h->long_ref[mmco[i].long_arg]->long_ref = 1;
625 h->cur_pic_ptr->reference |= h->picture_structure;
626 current_ref_assigned = 1;
628 case MMCO_SET_MAX_LONG:
629 assert(mmco[i].long_arg <= 16);
630 // just remove the long term which index is greater than new max
631 for (j = mmco[i].long_arg; j < 16; j++) {
632 remove_long(h, j, 0);
636 while (h->short_ref_count) {
637 remove_short(h, h->short_ref[0]->frame_num, 0);
639 for (j = 0; j < 16; j++) {
640 remove_long(h, j, 0);
642 h->frame_num = h->cur_pic_ptr->frame_num = 0;
644 h->cur_pic_ptr->mmco_reset = 1;
650 if (!current_ref_assigned) {
651 /* Second field of complementary field pair; the first field of
652 * which is already referenced. If short referenced, it
653 * should be first entry in short_ref. If not, it must exist
654 * in long_ref; trying to put it on the short list here is an
655 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
657 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
658 /* Just mark the second field valid */
659 h->cur_pic_ptr->reference = PICT_FRAME;
660 } else if (h->cur_pic_ptr->long_ref) {
661 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
662 "assignment for second field "
663 "in complementary field pair "
664 "(first field is long term)\n");
665 err = AVERROR_INVALIDDATA;
667 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
669 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
670 err = AVERROR_INVALIDDATA;
673 if (h->short_ref_count)
674 memmove(&h->short_ref[1], &h->short_ref[0],
675 h->short_ref_count * sizeof(Picture*));
677 h->short_ref[0] = h->cur_pic_ptr;
678 h->short_ref_count++;
679 h->cur_pic_ptr->reference |= h->picture_structure;
683 if (h->long_ref_count + h->short_ref_count -
684 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
686 /* We have too many reference frames, probably due to corrupted
687 * stream. Need to discard one frame. Prevents overrun of the
688 * short_ref and long_ref buffers.
690 av_log(h->avctx, AV_LOG_ERROR,
691 "number of reference frames (%d+%d) exceeds max (%d; probably "
692 "corrupt input), discarding one\n",
693 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
694 err = AVERROR_INVALIDDATA;
696 if (h->long_ref_count && !h->short_ref_count) {
697 for (i = 0; i < 16; ++i)
702 remove_long(h, i, 0);
704 pic = h->short_ref[h->short_ref_count - 1];
705 remove_short(h, pic->frame_num, 0);
711 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
714 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
718 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
721 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
722 skip_bits1(gb); // broken_link
724 mmco[0].opcode = MMCO_LONG;
725 mmco[0].long_arg = 0;
729 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
730 for (i = 0; i < MAX_MMCO_COUNT; i++) {
731 MMCOOpcode opcode = get_ue_golomb_31(gb);
733 mmco[i].opcode = opcode;
734 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
735 mmco[i].short_pic_num =
736 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
737 (h->max_pic_num - 1);
739 if (mmco[i].short_pic_num >= h->short_ref_count ||
740 h->short_ref[ mmco[i].short_pic_num ] == NULL){
741 av_log(s->avctx, AV_LOG_ERROR,
742 "illegal short ref in memory management control "
743 "operation %d\n", mmco);
748 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
749 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
750 unsigned int long_arg = get_ue_golomb_31(gb);
751 if (long_arg >= 32 ||
752 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
754 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
755 av_log(h->avctx, AV_LOG_ERROR,
756 "illegal long ref in memory management control "
757 "operation %d\n", opcode);
760 mmco[i].long_arg = long_arg;
763 if (opcode > (unsigned) MMCO_LONG) {
764 av_log(h->avctx, AV_LOG_ERROR,
765 "illegal memory management control operation %d\n",
769 if (opcode == MMCO_END)
775 ret = ff_generate_sliding_window_mmcos(h, first_slice);
776 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
783 if (first_slice && mmco_index != -1) {
784 h->mmco_index = mmco_index;
785 } else if (!first_slice && mmco_index >= 0 &&
786 (mmco_index != h->mmco_index ||
787 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
788 av_log(h->avctx, AV_LOG_ERROR,
789 "Inconsistent MMCO state between slices [%d, %d]\n",
790 mmco_index, h->mmco_index);
791 return AVERROR_INVALIDDATA;