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, int def_len,
71 Picture **in, int len, int is_long, int sel)
76 while ((i[0] < len || i[1] < len) && index < def_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))))
81 if (i[0] < len && index < def_len) {
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);
85 if (i[1] < len && index < def_len) {
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);
135 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]),
136 sorted, len, 0, h->picture_structure);
137 len += build_def_list(h->default_ref_list[list] + len,
138 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
139 h->long_ref, 16, 1, h->picture_structure);
141 if (len < h->ref_count[list])
142 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
146 if (lens[0] == lens[1] && lens[1] > 1) {
147 for (i = 0; i < lens[0] &&
148 h->default_ref_list[0][i].f.buf[0]->buffer ==
149 h->default_ref_list[1][i].f.buf[0]->buffer; i++);
152 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
153 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
154 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
158 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]),
159 h->short_ref, h->short_ref_count, 0, h->picture_structure);
160 len += build_def_list(h->default_ref_list[0] + len,
161 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
162 h-> long_ref, 16, 1, h->picture_structure);
164 if (len < h->ref_count[0])
165 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
168 for (i = 0; i < h->ref_count[0]; i++) {
169 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
170 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
171 h->default_ref_list[0][i].pic_id,
172 h->default_ref_list[0][i].f.data[0]);
174 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
175 for (i = 0; i < h->ref_count[1]; i++) {
176 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
177 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
178 h->default_ref_list[1][i].pic_id,
179 h->default_ref_list[1][i].f.data[0]);
186 static void print_short_term(H264Context *h);
187 static void print_long_term(H264Context *h);
190 * Extract structure information about the picture described by pic_num in
191 * the current decoding context (frame or field). Note that pic_num is
192 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
193 * @param pic_num picture number for which to extract structure information
194 * @param structure one of PICT_XXX describing structure of picture
196 * @return frame number (short term) or long term index of picture
197 * described by pic_num
199 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
201 *structure = h->picture_structure;
202 if (FIELD_PICTURE(h)) {
205 *structure ^= PICT_FRAME;
212 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
214 int list, index, pic_structure, i;
219 for (list = 0; list < h->list_count; list++) {
220 for (i = 0; i < h->ref_count[list]; i++)
221 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
223 if (get_bits1(&h->gb)) { // ref_pic_list_modification_flag_l[01]
224 int pred = h->curr_pic_num;
226 for (index = 0; ; index++) {
227 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
232 if (modification_of_pic_nums_idc == 3)
235 if (index >= h->ref_count[list]) {
236 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
240 switch (modification_of_pic_nums_idc) {
243 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
246 if (abs_diff_pic_num > h->max_pic_num) {
247 av_log(h->avctx, AV_LOG_ERROR,
248 "abs_diff_pic_num overflow\n");
249 return AVERROR_INVALIDDATA;
252 if (modification_of_pic_nums_idc == 0)
253 pred -= abs_diff_pic_num;
255 pred += abs_diff_pic_num;
256 pred &= h->max_pic_num - 1;
258 frame_num = pic_num_extract(h, pred, &pic_structure);
260 for (i = h->short_ref_count - 1; i >= 0; i--) {
261 ref = h->short_ref[i];
262 assert(ref->reference);
263 assert(!ref->long_ref);
264 if (ref->frame_num == frame_num &&
265 (ref->reference & pic_structure))
274 pic_id = get_ue_golomb(&h->gb); // long_term_pic_idx
276 long_idx = pic_num_extract(h, pic_id, &pic_structure);
279 av_log(h->avctx, AV_LOG_ERROR,
280 "long_term_pic_idx overflow\n");
281 return AVERROR_INVALIDDATA;
283 ref = h->long_ref[long_idx];
284 assert(!(ref && !ref->reference));
285 if (ref && (ref->reference & pic_structure)) {
286 ref->pic_id = pic_id;
287 assert(ref->long_ref);
295 av_log(h->avctx, AV_LOG_ERROR,
296 "illegal modification_of_pic_nums_idc %u\n",
297 modification_of_pic_nums_idc);
298 return AVERROR_INVALIDDATA;
302 av_log(h->avctx, AV_LOG_ERROR,
303 "reference picture missing during reorder\n");
304 memset(&h->ref_list[list][index], 0, sizeof(Picture)); // FIXME
306 for (i = index; i + 1 < h->ref_count[list]; i++) {
307 if (ref->long_ref == h->ref_list[list][i].long_ref &&
308 ref->pic_id == h->ref_list[list][i].pic_id)
311 for (; i > index; i--) {
312 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
314 COPY_PICTURE(&h->ref_list[list][index], ref);
315 if (FIELD_PICTURE(h)) {
316 pic_as_field(&h->ref_list[list][index], pic_structure);
322 for (list = 0; list < h->list_count; list++) {
323 for (index = 0; index < h->ref_count[list]; index++) {
324 if (!h->ref_list[list][index].f.buf[0]) {
325 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
326 if (h->default_ref_list[list][0].f.buf[0])
327 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
337 void ff_h264_fill_mbaff_ref_list(H264Context *h)
340 for (list = 0; list < 2; list++) { //FIXME try list_count
341 for (i = 0; i < h->ref_count[list]; i++) {
342 Picture *frame = &h->ref_list[list][i];
343 Picture *field = &h->ref_list[list][16 + 2 * i];
344 COPY_PICTURE(field, frame);
345 for (j = 0; j < 3; j++)
346 field[0].f.linesize[j] <<= 1;
347 field[0].reference = PICT_TOP_FIELD;
348 field[0].poc = field[0].field_poc[0];
349 COPY_PICTURE(field + 1, field);
350 for (j = 0; j < 3; j++)
351 field[1].f.data[j] += frame->f.linesize[j];
352 field[1].reference = PICT_BOTTOM_FIELD;
353 field[1].poc = field[1].field_poc[1];
355 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
356 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
357 for (j = 0; j < 2; j++) {
358 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];
359 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];
366 * Mark a picture as no longer needed for reference. The refmask
367 * argument allows unreferencing of individual fields or the whole frame.
368 * If the picture becomes entirely unreferenced, but is being held for
369 * display purposes, it is marked as such.
370 * @param refmask mask of fields to unreference; the mask is bitwise
371 * anded with the reference marking of pic
372 * @return non-zero if pic becomes entirely unreferenced (except possibly
373 * for display purposes) zero if one of the fields remains in
376 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
379 if (pic->reference &= refmask) {
382 for(i = 0; h->delayed_pic[i]; i++)
383 if(pic == h->delayed_pic[i]){
384 pic->reference = DELAYED_PIC_REF;
392 * Find a Picture in the short term reference list by frame number.
393 * @param frame_num frame number to search for
394 * @param idx the index into h->short_ref where returned picture is found
395 * undefined if no picture found.
396 * @return pointer to the found picture, or NULL if no pic with the provided
397 * frame number is found
399 static Picture *find_short(H264Context *h, int frame_num, int *idx)
403 for (i = 0; i < h->short_ref_count; i++) {
404 Picture *pic = h->short_ref[i];
405 if (h->avctx->debug & FF_DEBUG_MMCO)
406 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
407 if (pic->frame_num == frame_num) {
416 * Remove a picture from the short term reference list by its index in
417 * that list. This does no checking on the provided index; it is assumed
418 * to be valid. Other list entries are shifted down.
419 * @param i index into h->short_ref of picture to remove.
421 static void remove_short_at_index(H264Context *h, int i)
423 assert(i >= 0 && i < h->short_ref_count);
424 h->short_ref[i] = NULL;
425 if (--h->short_ref_count)
426 memmove(&h->short_ref[i], &h->short_ref[i + 1],
427 (h->short_ref_count - i) * sizeof(Picture*));
432 * @return the removed picture or NULL if an error occurs
434 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
439 if (h->avctx->debug & FF_DEBUG_MMCO)
440 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
442 pic = find_short(h, frame_num, &i);
444 if (unreference_pic(h, pic, ref_mask))
445 remove_short_at_index(h, i);
452 * Remove a picture from the long term reference list by its index in
454 * @return the removed picture or NULL if an error occurs
456 static Picture *remove_long(H264Context *h, int i, int ref_mask)
460 pic = h->long_ref[i];
462 if (unreference_pic(h, pic, ref_mask)) {
463 assert(h->long_ref[i]->long_ref == 1);
464 h->long_ref[i]->long_ref = 0;
465 h->long_ref[i] = NULL;
473 void ff_h264_remove_all_refs(H264Context *h)
477 for (i = 0; i < 16; i++) {
478 remove_long(h, i, 0);
480 assert(h->long_ref_count == 0);
482 for (i = 0; i < h->short_ref_count; i++) {
483 unreference_pic(h, h->short_ref[i], 0);
484 h->short_ref[i] = NULL;
486 h->short_ref_count = 0;
490 * print short term list
492 static void print_short_term(H264Context *h)
495 if (h->avctx->debug & FF_DEBUG_MMCO) {
496 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
497 for (i = 0; i < h->short_ref_count; i++) {
498 Picture *pic = h->short_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 * print long term list
508 static void print_long_term(H264Context *h)
511 if (h->avctx->debug & FF_DEBUG_MMCO) {
512 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
513 for (i = 0; i < 16; i++) {
514 Picture *pic = h->long_ref[i];
516 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
517 i, pic->frame_num, pic->poc, pic->f.data[0]);
523 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
527 for (i = 0; i < n_mmcos; i++) {
528 if (mmco1[i].opcode != mmco2[i].opcode)
535 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
537 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
538 int mmco_index = 0, i = 0;
540 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
542 if (h->short_ref_count &&
543 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
544 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
545 mmco[0].opcode = MMCO_SHORT2UNUSED;
546 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
548 if (FIELD_PICTURE(h)) {
549 mmco[0].short_pic_num *= 2;
550 mmco[1].opcode = MMCO_SHORT2UNUSED;
551 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
557 h->mmco_index = mmco_index;
558 } else if (!first_slice && mmco_index >= 0 &&
559 (mmco_index != h->mmco_index ||
560 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
561 av_log(h->avctx, AV_LOG_ERROR,
562 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
563 mmco_index, h->mmco_index, i);
564 return AVERROR_INVALIDDATA;
569 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
572 int current_ref_assigned = 0, err = 0;
573 Picture *av_uninit(pic);
575 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
576 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
578 for (i = 0; i < mmco_count; i++) {
579 int av_uninit(structure), av_uninit(frame_num);
580 if (h->avctx->debug & FF_DEBUG_MMCO)
581 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
582 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
584 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
585 mmco[i].opcode == MMCO_SHORT2LONG) {
586 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
587 pic = find_short(h, frame_num, &j);
589 if (mmco[i].opcode != MMCO_SHORT2LONG ||
590 !h->long_ref[mmco[i].long_arg] ||
591 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
592 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
593 err = AVERROR_INVALIDDATA;
599 switch (mmco[i].opcode) {
600 case MMCO_SHORT2UNUSED:
601 if (h->avctx->debug & FF_DEBUG_MMCO)
602 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
603 h->mmco[i].short_pic_num, h->short_ref_count);
604 remove_short(h, frame_num, structure ^ PICT_FRAME);
606 case MMCO_SHORT2LONG:
607 if (h->long_ref[mmco[i].long_arg] != pic)
608 remove_long(h, mmco[i].long_arg, 0);
610 remove_short_at_index(h, j);
611 h->long_ref[ mmco[i].long_arg ] = pic;
612 if (h->long_ref[mmco[i].long_arg]) {
613 h->long_ref[mmco[i].long_arg]->long_ref = 1;
617 case MMCO_LONG2UNUSED:
618 j = pic_num_extract(h, mmco[i].long_arg, &structure);
619 pic = h->long_ref[j];
621 remove_long(h, j, structure ^ PICT_FRAME);
622 } else if (h->avctx->debug & FF_DEBUG_MMCO)
623 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
626 // Comment below left from previous code as it is an interresting note.
627 /* First field in pair is in short term list or
628 * at a different long term index.
629 * This is not allowed; see 7.4.3.3, notes 2 and 3.
630 * Report the problem and keep the pair where it is,
631 * and mark this field valid.
633 if (h->short_ref[0] == h->cur_pic_ptr)
634 remove_short_at_index(h, 0);
636 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
637 remove_long(h, mmco[i].long_arg, 0);
639 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
640 h->long_ref[mmco[i].long_arg]->long_ref = 1;
644 h->cur_pic_ptr->reference |= h->picture_structure;
645 current_ref_assigned = 1;
647 case MMCO_SET_MAX_LONG:
648 assert(mmco[i].long_arg <= 16);
649 // just remove the long term which index is greater than new max
650 for (j = mmco[i].long_arg; j < 16; j++) {
651 remove_long(h, j, 0);
655 while (h->short_ref_count) {
656 remove_short(h, h->short_ref[0]->frame_num, 0);
658 for (j = 0; j < 16; j++) {
659 remove_long(h, j, 0);
661 h->frame_num = h->cur_pic_ptr->frame_num = 0;
663 h->cur_pic_ptr->mmco_reset = 1;
669 if (!current_ref_assigned) {
670 /* Second field of complementary field pair; the first field of
671 * which is already referenced. If short referenced, it
672 * should be first entry in short_ref. If not, it must exist
673 * in long_ref; trying to put it on the short list here is an
674 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
676 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
677 /* Just mark the second field valid */
678 h->cur_pic_ptr->reference = PICT_FRAME;
679 } else if (h->cur_pic_ptr->long_ref) {
680 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
681 "assignment for second field "
682 "in complementary field pair "
683 "(first field is long term)\n");
684 err = AVERROR_INVALIDDATA;
686 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
688 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
689 err = AVERROR_INVALIDDATA;
692 if (h->short_ref_count)
693 memmove(&h->short_ref[1], &h->short_ref[0],
694 h->short_ref_count * sizeof(Picture*));
696 h->short_ref[0] = h->cur_pic_ptr;
697 h->short_ref_count++;
698 h->cur_pic_ptr->reference |= h->picture_structure;
702 if (h->long_ref_count + h->short_ref_count -
703 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
705 /* We have too many reference frames, probably due to corrupted
706 * stream. Need to discard one frame. Prevents overrun of the
707 * short_ref and long_ref buffers.
709 av_log(h->avctx, AV_LOG_ERROR,
710 "number of reference frames (%d+%d) exceeds max (%d; probably "
711 "corrupt input), discarding one\n",
712 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
713 err = AVERROR_INVALIDDATA;
715 if (h->long_ref_count && !h->short_ref_count) {
716 for (i = 0; i < 16; ++i)
721 remove_long(h, i, 0);
723 pic = h->short_ref[h->short_ref_count - 1];
724 remove_short(h, pic->frame_num, 0);
730 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
733 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
737 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
740 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
741 skip_bits1(gb); // broken_link
743 mmco[0].opcode = MMCO_LONG;
744 mmco[0].long_arg = 0;
748 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
749 for (i = 0; i < MAX_MMCO_COUNT; i++) {
750 MMCOOpcode opcode = get_ue_golomb_31(gb);
752 mmco[i].opcode = opcode;
753 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
754 mmco[i].short_pic_num =
755 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
756 (h->max_pic_num - 1);
758 if (mmco[i].short_pic_num >= h->short_ref_count ||
759 h->short_ref[ mmco[i].short_pic_num ] == NULL){
760 av_log(s->avctx, AV_LOG_ERROR,
761 "illegal short ref in memory management control "
762 "operation %d\n", mmco);
767 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
768 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
769 unsigned int long_arg = get_ue_golomb_31(gb);
770 if (long_arg >= 32 ||
771 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
773 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
774 av_log(h->avctx, AV_LOG_ERROR,
775 "illegal long ref in memory management control "
776 "operation %d\n", opcode);
779 mmco[i].long_arg = long_arg;
782 if (opcode > (unsigned) MMCO_LONG) {
783 av_log(h->avctx, AV_LOG_ERROR,
784 "illegal memory management control operation %d\n",
788 if (opcode == MMCO_END)
794 ret = ff_generate_sliding_window_mmcos(h, first_slice);
795 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
802 if (first_slice && mmco_index != -1) {
803 h->mmco_index = mmco_index;
804 } else if (!first_slice && mmco_index >= 0 &&
805 (mmco_index != h->mmco_index ||
806 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
807 av_log(h->avctx, AV_LOG_ERROR,
808 "Inconsistent MMCO state between slices [%d, %d]\n",
809 mmco_index, h->mmco_index);
810 return AVERROR_INVALIDDATA;