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 FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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>
28 #include "libavutil/avassert.h"
39 static void pic_as_field(Picture *pic, const int parity){
41 for (i = 0; i < 4; ++i) {
42 if (parity == PICT_BOTTOM_FIELD)
43 pic->f.data[i] += pic->f.linesize[i];
44 pic->f.reference = parity;
45 pic->f.linesize[i] *= 2;
47 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
50 static int split_field_copy(Picture *dest, Picture *src,
51 int parity, int id_add){
52 int match = !!(src->f.reference & parity);
56 if(parity != PICT_FRAME){
57 pic_as_field(dest, parity);
59 dest->pic_id += id_add;
66 static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){
70 while(i[0]<len || i[1]<len){
71 while (i[0] < len && !(in[ i[0] ] && (in[ i[0] ]->f.reference & sel)))
73 while (i[1] < len && !(in[ i[1] ] && (in[ i[1] ]->f.reference & (sel^3))))
76 in[ i[0] ]->pic_id= is_long ? i[0] : in[ i[0] ]->frame_num;
77 split_field_copy(&def[index++], in[ i[0]++ ], sel , 1);
80 in[ i[1] ]->pic_id= is_long ? i[1] : in[ i[1] ]->frame_num;
81 split_field_copy(&def[index++], in[ i[1]++ ], sel^3, 0);
88 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){
93 best_poc= dir ? INT_MIN : INT_MAX;
96 const int poc= src[i]->poc;
97 if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){
99 sorted[out_i]= src[i];
102 if(best_poc == (dir ? INT_MIN : INT_MAX))
104 limit= sorted[out_i++]->poc - dir;
109 int ff_h264_fill_default_ref_list(H264Context *h){
112 if(h->slice_type_nos==AV_PICTURE_TYPE_B){
118 cur_poc= h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
120 cur_poc= h->cur_pic_ptr->poc;
122 for(list= 0; list<2; list++){
123 len= add_sorted(sorted , h->short_ref, h->short_ref_count, cur_poc, 1^list);
124 len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list);
126 len= build_def_list(h->default_ref_list[list] , sorted , len, 0, h->picture_structure);
127 len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, h->picture_structure);
130 if(len < h->ref_count[list])
131 memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len));
135 if(lens[0] == lens[1] && lens[1] > 1){
136 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++);
138 FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);
141 len = build_def_list(h->default_ref_list[0] , h->short_ref, h->short_ref_count, 0, h->picture_structure);
142 len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16 , 1, h->picture_structure);
144 if(len < h->ref_count[0])
145 memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len));
148 for (i=0; i<h->ref_count[0]; i++) {
149 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n", (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), h->default_ref_list[0][i].pic_id, h->default_ref_list[0][i].f.data[0]);
151 if(h->slice_type_nos==AV_PICTURE_TYPE_B){
152 for (i=0; i<h->ref_count[1]; i++) {
153 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n", (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), h->default_ref_list[1][i].pic_id, h->default_ref_list[1][i].f.data[0]);
160 static void print_short_term(H264Context *h);
161 static void print_long_term(H264Context *h);
164 * Extract structure information about the picture described by pic_num in
165 * the current decoding context (frame or field). Note that pic_num is
166 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
167 * @param pic_num picture number for which to extract structure information
168 * @param structure one of PICT_XXX describing structure of picture
170 * @return frame number (short term) or long term index of picture
171 * described by pic_num
173 static int pic_num_extract(H264Context *h, int pic_num, int *structure){
174 *structure = h->picture_structure;
178 *structure ^= PICT_FRAME;
185 int ff_h264_decode_ref_pic_list_reordering(H264Context *h){
186 int list, index, pic_structure;
191 for(list=0; list<h->list_count; list++){
192 memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]);
194 if(get_bits1(&h->gb)){
195 int pred= h->curr_pic_num;
197 for(index=0; ; index++){
198 unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&h->gb);
203 if(reordering_of_pic_nums_idc==3)
206 if(index >= h->ref_count[list]){
207 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
211 if(reordering_of_pic_nums_idc<3){
212 if(reordering_of_pic_nums_idc<2){
213 const unsigned int abs_diff_pic_num= get_ue_golomb(&h->gb) + 1;
216 if(abs_diff_pic_num > h->max_pic_num){
217 av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
221 if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num;
222 else pred+= abs_diff_pic_num;
223 pred &= h->max_pic_num - 1;
225 frame_num = pic_num_extract(h, pred, &pic_structure);
227 for(i= h->short_ref_count-1; i>=0; i--){
228 ref = h->short_ref[i];
229 assert(ref->f.reference);
230 assert(!ref->long_ref);
232 ref->frame_num == frame_num &&
233 (ref->f.reference & pic_structure)
241 pic_id= get_ue_golomb(&h->gb); //long_term_pic_idx
243 long_idx= pic_num_extract(h, pic_id, &pic_structure);
246 av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
249 ref = h->long_ref[long_idx];
250 assert(!(ref && !ref->f.reference));
251 if (ref && (ref->f.reference & pic_structure)) {
253 assert(ref->long_ref);
261 av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
262 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
264 for(i=index; i+1<h->ref_count[list]; i++){
265 if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id)
268 for(; i > index; i--){
269 h->ref_list[list][i]= h->ref_list[list][i-1];
271 h->ref_list[list][index]= *ref;
273 pic_as_field(&h->ref_list[list][index], pic_structure);
277 av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
283 for(list=0; list<h->list_count; list++){
284 for(index= 0; index < h->ref_count[list]; index++){
285 if (!h->ref_list[list][index].f.data[0]) {
287 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
288 for (i=0; i<FF_ARRAY_ELEMS(h->last_pocs); i++)
289 h->last_pocs[i] = INT_MIN;
290 if (h->default_ref_list[list][0].f.data[0])
291 h->ref_list[list][index]= h->default_ref_list[list][0];
301 void ff_h264_fill_mbaff_ref_list(H264Context *h){
303 for(list=0; list<h->list_count; list++){
304 for(i=0; i<h->ref_count[list]; i++){
305 Picture *frame = &h->ref_list[list][i];
306 Picture *field = &h->ref_list[list][16+2*i];
309 field[0].f.linesize[j] <<= 1;
310 field[0].f.reference = PICT_TOP_FIELD;
311 field[0].poc= field[0].field_poc[0];
314 field[1].f.data[j] += frame->f.linesize[j];
315 field[1].f.reference = PICT_BOTTOM_FIELD;
316 field[1].poc= field[1].field_poc[1];
318 h->luma_weight[16+2*i][list][0] = h->luma_weight[16+2*i+1][list][0] = h->luma_weight[i][list][0];
319 h->luma_weight[16+2*i][list][1] = h->luma_weight[16+2*i+1][list][1] = h->luma_weight[i][list][1];
321 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];
322 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];
329 * Mark a picture as no longer needed for reference. The refmask
330 * argument allows unreferencing of individual fields or the whole frame.
331 * If the picture becomes entirely unreferenced, but is being held for
332 * display purposes, it is marked as such.
333 * @param refmask mask of fields to unreference; the mask is bitwise
334 * anded with the reference marking of pic
335 * @return non-zero if pic becomes entirely unreferenced (except possibly
336 * for display purposes) zero if one of the fields remains in
339 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){
341 if (pic->f.reference &= refmask) {
344 for(i = 0; h->delayed_pic[i]; i++)
345 if(pic == h->delayed_pic[i]){
346 pic->f.reference = DELAYED_PIC_REF;
354 * Find a Picture in the short term reference list by frame number.
355 * @param frame_num frame number to search for
356 * @param idx the index into h->short_ref where returned picture is found
357 * undefined if no picture found.
358 * @return pointer to the found picture, or NULL if no pic with the provided
359 * frame number is found
361 static Picture * find_short(H264Context *h, int frame_num, int *idx){
364 for(i=0; i<h->short_ref_count; i++){
365 Picture *pic= h->short_ref[i];
366 if(h->avctx->debug&FF_DEBUG_MMCO)
367 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
368 if(pic->frame_num == frame_num) {
377 * Remove a picture from the short term reference list by its index in
378 * that list. This does no checking on the provided index; it is assumed
379 * to be valid. Other list entries are shifted down.
380 * @param i index into h->short_ref of picture to remove.
382 static void remove_short_at_index(H264Context *h, int i){
383 assert(i >= 0 && i < h->short_ref_count);
384 h->short_ref[i]= NULL;
385 if (--h->short_ref_count)
386 memmove(&h->short_ref[i], &h->short_ref[i+1], (h->short_ref_count - i)*sizeof(Picture*));
391 * @return the removed picture or NULL if an error occurs
393 static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){
397 if(h->avctx->debug&FF_DEBUG_MMCO)
398 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
400 pic = find_short(h, frame_num, &i);
402 if(unreference_pic(h, pic, ref_mask))
403 remove_short_at_index(h, i);
410 * Remove a picture from the long term reference list by its index in
412 * @return the removed picture or NULL if an error occurs
414 static Picture * remove_long(H264Context *h, int i, int ref_mask){
419 if(unreference_pic(h, pic, ref_mask)){
420 assert(h->long_ref[i]->long_ref == 1);
421 h->long_ref[i]->long_ref= 0;
422 h->long_ref[i]= NULL;
430 void ff_h264_remove_all_refs(H264Context *h){
434 remove_long(h, i, 0);
436 assert(h->long_ref_count==0);
438 for(i=0; i<h->short_ref_count; i++){
439 unreference_pic(h, h->short_ref[i], 0);
440 h->short_ref[i]= NULL;
442 h->short_ref_count=0;
444 memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
445 memset(h->ref_list, 0, sizeof(h->ref_list));
449 * print short term list
451 static void print_short_term(H264Context *h) {
453 if(h->avctx->debug&FF_DEBUG_MMCO) {
454 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
455 for(i=0; i<h->short_ref_count; i++){
456 Picture *pic= h->short_ref[i];
457 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
458 i, pic->frame_num, pic->poc, pic->f.data[0]);
464 * print long term list
466 static void print_long_term(H264Context *h) {
468 if(h->avctx->debug&FF_DEBUG_MMCO) {
469 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
470 for(i = 0; i < 16; i++){
471 Picture *pic= h->long_ref[i];
473 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
474 i, pic->frame_num, pic->poc, pic->f.data[0]);
480 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
484 for (i = 0; i < n_mmcos; i++) {
485 if (mmco1[i].opcode != mmco2[i].opcode) {
486 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
487 mmco1[i].opcode, mmco2[i].opcode, i);
495 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
497 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
498 int mmco_index = 0, i;
500 if (h->short_ref_count &&
501 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
502 !(FIELD_PICTURE && !h->first_field && h->cur_pic_ptr->f.reference)) {
503 mmco[0].opcode = MMCO_SHORT2UNUSED;
504 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
507 mmco[0].short_pic_num *= 2;
508 mmco[1].opcode = MMCO_SHORT2UNUSED;
509 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
515 h->mmco_index = mmco_index;
516 } else if (!first_slice && mmco_index >= 0 &&
517 (mmco_index != h->mmco_index ||
518 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
519 av_log(h->avctx, AV_LOG_ERROR,
520 "Inconsistent MMCO state between slices [%d, %d]\n",
521 mmco_index, h->mmco_index);
522 return AVERROR_INVALIDDATA;
527 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){
529 int current_ref_assigned=0, err=0;
530 Picture *av_uninit(pic);
532 if((h->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0)
533 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
535 for(i=0; i<mmco_count; i++){
536 int av_uninit(structure), av_uninit(frame_num);
537 if(h->avctx->debug&FF_DEBUG_MMCO)
538 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, h->mmco[i].short_pic_num, h->mmco[i].long_arg);
540 if( mmco[i].opcode == MMCO_SHORT2UNUSED
541 || mmco[i].opcode == MMCO_SHORT2LONG){
542 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
543 pic = find_short(h, frame_num, &j);
545 if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg]
546 || h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
547 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
548 err = AVERROR_INVALIDDATA;
554 switch(mmco[i].opcode){
555 case MMCO_SHORT2UNUSED:
556 if(h->avctx->debug&FF_DEBUG_MMCO)
557 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", h->mmco[i].short_pic_num, h->short_ref_count);
558 remove_short(h, frame_num, structure ^ PICT_FRAME);
560 case MMCO_SHORT2LONG:
561 if (h->long_ref[mmco[i].long_arg] != pic)
562 remove_long(h, mmco[i].long_arg, 0);
564 remove_short_at_index(h, j);
565 h->long_ref[ mmco[i].long_arg ]= pic;
566 if (h->long_ref[ mmco[i].long_arg ]){
567 h->long_ref[ mmco[i].long_arg ]->long_ref=1;
571 case MMCO_LONG2UNUSED:
572 j = pic_num_extract(h, mmco[i].long_arg, &structure);
573 pic = h->long_ref[j];
575 remove_long(h, j, structure ^ PICT_FRAME);
576 } else if(h->avctx->debug&FF_DEBUG_MMCO)
577 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
580 // Comment below left from previous code as it is an interresting note.
581 /* First field in pair is in short term list or
582 * at a different long term index.
583 * This is not allowed; see 7.4.3.3, notes 2 and 3.
584 * Report the problem and keep the pair where it is,
585 * and mark this field valid.
588 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
589 remove_long(h, mmco[i].long_arg, 0);
591 h->long_ref[ mmco[i].long_arg ]= h->cur_pic_ptr;
592 h->long_ref[ mmco[i].long_arg ]->long_ref=1;
596 h->cur_pic_ptr->f.reference |= h->picture_structure;
597 current_ref_assigned=1;
599 case MMCO_SET_MAX_LONG:
600 assert(mmco[i].long_arg <= 16);
601 // just remove the long term which index is greater than new max
602 for(j = mmco[i].long_arg; j<16; j++){
603 remove_long(h, j, 0);
607 while(h->short_ref_count){
608 remove_short(h, h->short_ref[0]->frame_num, 0);
610 for(j = 0; j < 16; j++) {
611 remove_long(h, j, 0);
614 h->cur_pic_ptr->frame_num= 0;
616 h->cur_pic_ptr->mmco_reset=1;
617 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
618 h->last_pocs[j] = INT_MIN;
624 if (!current_ref_assigned) {
625 /* Second field of complementary field pair; the first field of
626 * which is already referenced. If short referenced, it
627 * should be first entry in short_ref. If not, it must exist
628 * in long_ref; trying to put it on the short list here is an
629 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
631 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
632 /* Just mark the second field valid */
633 h->cur_pic_ptr->f.reference = PICT_FRAME;
634 } else if (h->cur_pic_ptr->long_ref) {
635 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
636 "assignment for second field "
637 "in complementary field pair "
638 "(first field is long term)\n");
639 err = AVERROR_INVALIDDATA;
641 pic= remove_short(h, h->cur_pic_ptr->frame_num, 0);
643 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
644 err = AVERROR_INVALIDDATA;
647 if(h->short_ref_count)
648 memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*));
650 h->short_ref[0]= h->cur_pic_ptr;
651 h->short_ref_count++;
652 h->cur_pic_ptr->f.reference |= h->picture_structure;
656 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)){
658 /* We have too many reference frames, probably due to corrupted
659 * stream. Need to discard one frame. Prevents overrun of the
660 * short_ref and long_ref buffers.
662 av_log(h->avctx, AV_LOG_ERROR,
663 "number of reference frames (%d+%d) exceeds max (%d; probably "
664 "corrupt input), discarding one\n",
665 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
666 err = AVERROR_INVALIDDATA;
668 if (h->long_ref_count && !h->short_ref_count) {
669 for (i = 0; i < 16; ++i)
674 remove_long(h, i, 0);
676 pic = h->short_ref[h->short_ref_count - 1];
677 remove_short(h, pic->frame_num, 0);
684 if(err >= 0 && h->long_ref_count==0 && h->short_ref_count<=2 && h->pps.ref_count[0]<=1 + (h->picture_structure != PICT_FRAME) && h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){
685 h->cur_pic_ptr->sync |= 1;
686 if(!h->avctx->has_b_frames)
690 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
693 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
697 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
700 if (h->nal_unit_type == NAL_IDR_SLICE){ // FIXME fields
701 skip_bits1(gb); // broken_link
703 mmco[0].opcode = MMCO_LONG;
704 mmco[0].long_arg = 0;
708 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
709 for (i = 0; i < MAX_MMCO_COUNT; i++) {
710 MMCOOpcode opcode = get_ue_golomb_31(gb);
712 mmco[i].opcode = opcode;
713 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG){
714 mmco[i].short_pic_num =
715 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
716 (h->max_pic_num - 1);
718 if (mmco[i].short_pic_num >= h->short_ref_count ||
719 h->short_ref[ mmco[i].short_pic_num ] == NULL){
720 av_log(s->avctx, AV_LOG_ERROR,
721 "illegal short ref in memory management control "
722 "operation %d\n", mmco);
727 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
728 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
729 unsigned int long_arg = get_ue_golomb_31(gb);
730 if (long_arg >= 32 ||
731 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
733 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){
734 av_log(h->avctx, AV_LOG_ERROR,
735 "illegal long ref in memory management control "
736 "operation %d\n", opcode);
739 mmco[i].long_arg = long_arg;
742 if (opcode > (unsigned) MMCO_LONG){
743 av_log(h->avctx, AV_LOG_ERROR,
744 "illegal memory management control operation %d\n",
748 if (opcode == MMCO_END)
754 ret = ff_generate_sliding_window_mmcos(h, first_slice);
755 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
762 if (first_slice && mmco_index != -1) {
763 h->mmco_index = mmco_index;
764 } else if (!first_slice && mmco_index >= 0 &&
765 (mmco_index != h->mmco_index ||
766 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
767 av_log(h->avctx, AV_LOG_ERROR,
768 "Inconsistent MMCO state between slices [%d, %d]\n",
769 mmco_index, h->mmco_index);
770 return AVERROR_INVALIDDATA;