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++) {
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];
381 * Mark a picture as no longer needed for reference. The refmask
382 * argument allows unreferencing of individual fields or the whole frame.
383 * If the picture becomes entirely unreferenced, but is being held for
384 * display purposes, it is marked as such.
385 * @param refmask mask of fields to unreference; the mask is bitwise
386 * anded with the reference marking of pic
387 * @return non-zero if pic becomes entirely unreferenced (except possibly
388 * for display purposes) zero if one of the fields remains in
391 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
394 if (pic->reference &= refmask) {
397 for(i = 0; h->delayed_pic[i]; i++)
398 if(pic == h->delayed_pic[i]){
399 pic->reference = DELAYED_PIC_REF;
407 * Find a H264Picture in the short term reference list by frame number.
408 * @param frame_num frame number to search for
409 * @param idx the index into h->short_ref where returned picture is found
410 * undefined if no picture found.
411 * @return pointer to the found picture, or NULL if no pic with the provided
412 * frame number is found
414 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
418 for (i = 0; i < h->short_ref_count; i++) {
419 H264Picture *pic = h->short_ref[i];
420 if (h->avctx->debug & FF_DEBUG_MMCO)
421 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
422 if (pic->frame_num == frame_num) {
431 * Remove a picture from the short term reference list by its index in
432 * that list. This does no checking on the provided index; it is assumed
433 * to be valid. Other list entries are shifted down.
434 * @param i index into h->short_ref of picture to remove.
436 static void remove_short_at_index(H264Context *h, int i)
438 assert(i >= 0 && i < h->short_ref_count);
439 h->short_ref[i] = NULL;
440 if (--h->short_ref_count)
441 memmove(&h->short_ref[i], &h->short_ref[i + 1],
442 (h->short_ref_count - i) * sizeof(H264Picture*));
446 * @return the removed picture or NULL if an error occurs
448 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
453 if (h->avctx->debug & FF_DEBUG_MMCO)
454 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
456 pic = find_short(h, frame_num, &i);
458 if (unreference_pic(h, pic, ref_mask))
459 remove_short_at_index(h, i);
466 * Remove a picture from the long term reference list by its index in
468 * @return the removed picture or NULL if an error occurs
470 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
474 pic = h->long_ref[i];
476 if (unreference_pic(h, pic, ref_mask)) {
477 assert(h->long_ref[i]->long_ref == 1);
478 h->long_ref[i]->long_ref = 0;
479 h->long_ref[i] = NULL;
487 void ff_h264_remove_all_refs(H264Context *h)
491 for (i = 0; i < 16; i++) {
492 remove_long(h, i, 0);
494 assert(h->long_ref_count == 0);
496 for (i = 0; i < h->short_ref_count; i++) {
497 unreference_pic(h, h->short_ref[i], 0);
498 h->short_ref[i] = NULL;
500 h->short_ref_count = 0;
503 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
507 for (i = 0; i < n_mmcos; i++) {
508 if (mmco1[i].opcode != mmco2[i].opcode)
515 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
517 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
518 int mmco_index = 0, i = 0;
520 assert(h->long_ref_count + h->short_ref_count <= h->ps.sps->ref_frame_count);
522 if (h->short_ref_count &&
523 h->long_ref_count + h->short_ref_count == h->ps.sps->ref_frame_count &&
524 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
525 mmco[0].opcode = MMCO_SHORT2UNUSED;
526 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
528 if (FIELD_PICTURE(h)) {
529 mmco[0].short_pic_num *= 2;
530 mmco[1].opcode = MMCO_SHORT2UNUSED;
531 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
537 h->mmco_index = mmco_index;
538 } else if (!first_slice && mmco_index >= 0 &&
539 (mmco_index != h->mmco_index ||
540 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
541 av_log(h->avctx, AV_LOG_ERROR,
542 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
543 mmco_index, h->mmco_index, i);
544 return AVERROR_INVALIDDATA;
549 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
552 int current_ref_assigned = 0, err = 0;
553 H264Picture *av_uninit(pic);
555 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
556 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
558 for (i = 0; i < mmco_count; i++) {
559 int av_uninit(structure), av_uninit(frame_num);
560 if (h->avctx->debug & FF_DEBUG_MMCO)
561 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
562 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
564 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
565 mmco[i].opcode == MMCO_SHORT2LONG) {
566 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
567 pic = find_short(h, frame_num, &j);
569 if (mmco[i].opcode != MMCO_SHORT2LONG ||
570 !h->long_ref[mmco[i].long_arg] ||
571 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
572 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
573 err = AVERROR_INVALIDDATA;
579 switch (mmco[i].opcode) {
580 case MMCO_SHORT2UNUSED:
581 if (h->avctx->debug & FF_DEBUG_MMCO)
582 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
583 h->mmco[i].short_pic_num, h->short_ref_count);
584 remove_short(h, frame_num, structure ^ PICT_FRAME);
586 case MMCO_SHORT2LONG:
587 if (h->long_ref[mmco[i].long_arg] != pic)
588 remove_long(h, mmco[i].long_arg, 0);
590 remove_short_at_index(h, j);
591 h->long_ref[ mmco[i].long_arg ] = pic;
592 if (h->long_ref[mmco[i].long_arg]) {
593 h->long_ref[mmco[i].long_arg]->long_ref = 1;
597 case MMCO_LONG2UNUSED:
598 j = pic_num_extract(h, mmco[i].long_arg, &structure);
599 pic = h->long_ref[j];
601 remove_long(h, j, structure ^ PICT_FRAME);
602 } else if (h->avctx->debug & FF_DEBUG_MMCO)
603 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
606 // Comment below left from previous code as it is an interesting note.
607 /* First field in pair is in short term list or
608 * at a different long term index.
609 * This is not allowed; see 7.4.3.3, notes 2 and 3.
610 * Report the problem and keep the pair where it is,
611 * and mark this field valid.
613 if (h->short_ref[0] == h->cur_pic_ptr)
614 remove_short_at_index(h, 0);
616 /* make sure the current picture is not already assigned as a long ref */
617 if (h->cur_pic_ptr->long_ref) {
618 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
619 if (h->long_ref[j] == h->cur_pic_ptr)
620 remove_long(h, j, 0);
625 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
626 remove_long(h, mmco[i].long_arg, 0);
628 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
629 h->long_ref[mmco[i].long_arg]->long_ref = 1;
633 h->cur_pic_ptr->reference |= h->picture_structure;
634 current_ref_assigned = 1;
636 case MMCO_SET_MAX_LONG:
637 assert(mmco[i].long_arg <= 16);
638 // just remove the long term which index is greater than new max
639 for (j = mmco[i].long_arg; j < 16; j++) {
640 remove_long(h, j, 0);
644 while (h->short_ref_count) {
645 remove_short(h, h->short_ref[0]->frame_num, 0);
647 for (j = 0; j < 16; j++) {
648 remove_long(h, j, 0);
650 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
652 h->cur_pic_ptr->mmco_reset = 1;
658 if (!current_ref_assigned) {
659 /* Second field of complementary field pair; the first field of
660 * which is already referenced. If short referenced, it
661 * should be first entry in short_ref. If not, it must exist
662 * in long_ref; trying to put it on the short list here is an
663 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
665 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
666 /* Just mark the second field valid */
667 h->cur_pic_ptr->reference = PICT_FRAME;
668 } else if (h->cur_pic_ptr->long_ref) {
669 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
670 "assignment for second field "
671 "in complementary field pair "
672 "(first field is long term)\n");
673 err = AVERROR_INVALIDDATA;
675 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
677 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
678 err = AVERROR_INVALIDDATA;
681 if (h->short_ref_count)
682 memmove(&h->short_ref[1], &h->short_ref[0],
683 h->short_ref_count * sizeof(H264Picture*));
685 h->short_ref[0] = h->cur_pic_ptr;
686 h->short_ref_count++;
687 h->cur_pic_ptr->reference |= h->picture_structure;
691 if (h->long_ref_count + h->short_ref_count -
692 (h->short_ref[0] == h->cur_pic_ptr) > h->ps.sps->ref_frame_count) {
694 /* We have too many reference frames, probably due to corrupted
695 * stream. Need to discard one frame. Prevents overrun of the
696 * short_ref and long_ref buffers.
698 av_log(h->avctx, AV_LOG_ERROR,
699 "number of reference frames (%d+%d) exceeds max (%d; probably "
700 "corrupt input), discarding one\n",
701 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
702 err = AVERROR_INVALIDDATA;
704 if (h->long_ref_count && !h->short_ref_count) {
705 for (i = 0; i < 16; ++i)
710 remove_long(h, i, 0);
712 pic = h->short_ref[h->short_ref_count - 1];
713 remove_short(h, pic->frame_num, 0);
719 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
722 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
726 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
729 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
730 skip_bits1(gb); // broken_link
732 mmco[0].opcode = MMCO_LONG;
733 mmco[0].long_arg = 0;
737 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
738 for (i = 0; i < MAX_MMCO_COUNT; i++) {
739 MMCOOpcode opcode = get_ue_golomb_31(gb);
741 mmco[i].opcode = opcode;
742 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
743 mmco[i].short_pic_num =
744 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
745 (h->max_pic_num - 1);
747 if (mmco[i].short_pic_num >= h->short_ref_count ||
748 !h->short_ref[mmco[i].short_pic_num]) {
749 av_log(s->avctx, AV_LOG_ERROR,
750 "illegal short ref in memory management control "
751 "operation %d\n", mmco);
756 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
757 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
758 unsigned int long_arg = get_ue_golomb_31(gb);
759 if (long_arg >= 32 ||
760 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
762 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
763 av_log(h->avctx, AV_LOG_ERROR,
764 "illegal long ref in memory management control "
765 "operation %d\n", opcode);
768 mmco[i].long_arg = long_arg;
771 if (opcode > (unsigned) MMCO_LONG) {
772 av_log(h->avctx, AV_LOG_ERROR,
773 "illegal memory management control operation %d\n",
777 if (opcode == MMCO_END)
783 ret = ff_generate_sliding_window_mmcos(h, first_slice);
784 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
791 if (first_slice && mmco_index != -1) {
792 h->mmco_index = mmco_index;
793 } else if (!first_slice && mmco_index >= 0 &&
794 (mmco_index != h->mmco_index ||
795 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
796 av_log(h->avctx, AV_LOG_ERROR,
797 "Inconsistent MMCO state between slices [%d, %d]\n",
798 mmco_index, h->mmco_index);
799 return AVERROR_INVALIDDATA;