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>
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 **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 **src, int len, int limit, int dir)
106 best_poc = dir ? INT_MIN : INT_MAX;
108 for (i = 0; i < len; i++) {
109 const int poc = src[i]->poc;
110 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
112 sorted[out_i] = src[i];
115 if (best_poc == (dir ? INT_MIN : INT_MAX))
117 limit = sorted[out_i++]->poc - dir;
122 int ff_h264_fill_default_ref_list(H264Context *h, H264SliceContext *sl)
126 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
127 H264Picture *sorted[32];
131 if (FIELD_PICTURE(h))
132 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
134 cur_poc = h->cur_pic_ptr->poc;
136 for (list = 0; list < 2; list++) {
137 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
138 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
141 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]),
142 sorted, len, 0, h->picture_structure);
143 len += build_def_list(h->default_ref_list[list] + len,
144 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
145 h->long_ref, 16, 1, h->picture_structure);
147 if (len < sl->ref_count[list])
148 memset(&h->default_ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
152 if (lens[0] == lens[1] && lens[1] > 1) {
153 for (i = 0; i < lens[0] &&
154 h->default_ref_list[0][i].parent->f->buf[0]->buffer ==
155 h->default_ref_list[1][i].parent->f->buf[0]->buffer; i++);
157 FFSWAP(H264Ref, h->default_ref_list[1][0], h->default_ref_list[1][1]);
161 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]),
162 h->short_ref, h->short_ref_count, 0, h->picture_structure);
163 len += build_def_list(h->default_ref_list[0] + len,
164 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
165 h-> long_ref, 16, 1, h->picture_structure);
167 if (len < sl->ref_count[0])
168 memset(&h->default_ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
171 for (i = 0; i < sl->ref_count[0]; i++) {
172 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
173 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
174 h->default_ref_list[0][i].pic_id,
175 h->default_ref_list[0][i].f->data[0]);
177 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
178 for (i = 0; i < sl->ref_count[1]; i++) {
179 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
180 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
181 h->default_ref_list[1][i].pic_id,
182 h->default_ref_list[1][i].f->data[0]);
189 static void print_short_term(H264Context *h);
190 static void print_long_term(H264Context *h);
193 * Extract structure information about the picture described by pic_num in
194 * the current decoding context (frame or field). Note that pic_num is
195 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
196 * @param pic_num picture number for which to extract structure information
197 * @param structure one of PICT_XXX describing structure of picture
199 * @return frame number (short term) or long term index of picture
200 * described by pic_num
202 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
204 *structure = h->picture_structure;
205 if (FIELD_PICTURE(h)) {
208 *structure ^= PICT_FRAME;
215 int ff_h264_decode_ref_pic_list_reordering(H264Context *h, H264SliceContext *sl)
217 int list, index, pic_structure;
222 for (list = 0; list < sl->list_count; list++) {
223 memcpy(sl->ref_list[list], h->default_ref_list[list], sl->ref_count[list] * sizeof(sl->ref_list[0][0]));
225 if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
226 int pred = h->curr_pic_num;
228 for (index = 0; ; index++) {
229 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
232 H264Picture *ref = NULL;
234 if (modification_of_pic_nums_idc == 3)
237 if (index >= sl->ref_count[list]) {
238 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
242 switch (modification_of_pic_nums_idc) {
245 const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
248 if (abs_diff_pic_num > h->max_pic_num) {
249 av_log(h->avctx, AV_LOG_ERROR,
250 "abs_diff_pic_num overflow\n");
251 return AVERROR_INVALIDDATA;
254 if (modification_of_pic_nums_idc == 0)
255 pred -= abs_diff_pic_num;
257 pred += abs_diff_pic_num;
258 pred &= h->max_pic_num - 1;
260 frame_num = pic_num_extract(h, pred, &pic_structure);
262 for (i = h->short_ref_count - 1; i >= 0; i--) {
263 ref = h->short_ref[i];
264 assert(ref->reference);
265 assert(!ref->long_ref);
266 if (ref->frame_num == frame_num &&
267 (ref->reference & pic_structure))
276 pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
278 long_idx = pic_num_extract(h, pic_id, &pic_structure);
281 av_log(h->avctx, AV_LOG_ERROR,
282 "long_term_pic_idx overflow\n");
283 return AVERROR_INVALIDDATA;
285 ref = h->long_ref[long_idx];
286 assert(!(ref && !ref->reference));
287 if (ref && (ref->reference & pic_structure)) {
288 ref->pic_id = pic_id;
289 assert(ref->long_ref);
297 av_log(h->avctx, AV_LOG_ERROR,
298 "illegal modification_of_pic_nums_idc %u\n",
299 modification_of_pic_nums_idc);
300 return AVERROR_INVALIDDATA;
304 av_log(h->avctx, AV_LOG_ERROR,
305 "reference picture missing during reorder\n");
306 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
308 for (i = index; i + 1 < sl->ref_count[list]; i++) {
309 if (sl->ref_list[list][i].parent &&
310 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
311 ref->pic_id == sl->ref_list[list][i].pic_id)
314 for (; i > index; i--) {
315 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
317 ref_from_h264pic(&sl->ref_list[list][index], ref);
318 if (FIELD_PICTURE(h)) {
319 pic_as_field(&sl->ref_list[list][index], pic_structure);
325 for (list = 0; list < sl->list_count; list++) {
326 for (index = 0; index < sl->ref_count[list]; index++) {
327 if (!sl->ref_list[list][index].parent) {
328 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
329 if (h->default_ref_list[list][0].parent)
330 sl->ref_list[list][index] = h->default_ref_list[list][0];
340 void ff_h264_fill_mbaff_ref_list(H264Context *h, H264SliceContext *sl)
343 for (list = 0; list < sl->list_count; list++) { //FIXME try list_count
344 for (i = 0; i < sl->ref_count[list]; i++) {
345 H264Ref *frame = &sl->ref_list[list][i];
346 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
350 for (j = 0; j < 3; j++)
351 field[0].linesize[j] <<= 1;
352 field[0].reference = PICT_TOP_FIELD;
353 field[0].poc = field[0].parent->field_poc[0];
357 for (j = 0; j < 3; j++)
358 field[1].data[j] += frame->parent->f->linesize[j];
359 field[1].reference = PICT_BOTTOM_FIELD;
360 field[1].poc = field[1].parent->field_poc[1];
362 sl->luma_weight[16 + 2 * i][list][0] = sl->luma_weight[16 + 2 * i + 1][list][0] = sl->luma_weight[i][list][0];
363 sl->luma_weight[16 + 2 * i][list][1] = sl->luma_weight[16 + 2 * i + 1][list][1] = sl->luma_weight[i][list][1];
364 for (j = 0; j < 2; j++) {
365 sl->chroma_weight[16 + 2 * i][list][j][0] = sl->chroma_weight[16 + 2 * i + 1][list][j][0] = sl->chroma_weight[i][list][j][0];
366 sl->chroma_weight[16 + 2 * i][list][j][1] = sl->chroma_weight[16 + 2 * i + 1][list][j][1] = sl->chroma_weight[i][list][j][1];
373 * Mark a picture as no longer needed for reference. The refmask
374 * argument allows unreferencing of individual fields or the whole frame.
375 * If the picture becomes entirely unreferenced, but is being held for
376 * display purposes, it is marked as such.
377 * @param refmask mask of fields to unreference; the mask is bitwise
378 * anded with the reference marking of pic
379 * @return non-zero if pic becomes entirely unreferenced (except possibly
380 * for display purposes) zero if one of the fields remains in
383 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
386 if (pic->reference &= refmask) {
389 for(i = 0; h->delayed_pic[i]; i++)
390 if(pic == h->delayed_pic[i]){
391 pic->reference = DELAYED_PIC_REF;
399 * Find a H264Picture in the short term reference list by frame number.
400 * @param frame_num frame number to search for
401 * @param idx the index into h->short_ref where returned picture is found
402 * undefined if no picture found.
403 * @return pointer to the found picture, or NULL if no pic with the provided
404 * frame number is found
406 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
410 for (i = 0; i < h->short_ref_count; i++) {
411 H264Picture *pic = h->short_ref[i];
412 if (h->avctx->debug & FF_DEBUG_MMCO)
413 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
414 if (pic->frame_num == frame_num) {
423 * Remove a picture from the short term reference list by its index in
424 * that list. This does no checking on the provided index; it is assumed
425 * to be valid. Other list entries are shifted down.
426 * @param i index into h->short_ref of picture to remove.
428 static void remove_short_at_index(H264Context *h, int i)
430 assert(i >= 0 && i < h->short_ref_count);
431 h->short_ref[i] = NULL;
432 if (--h->short_ref_count)
433 memmove(&h->short_ref[i], &h->short_ref[i + 1],
434 (h->short_ref_count - i) * sizeof(H264Picture*));
439 * @return the removed picture or NULL if an error occurs
441 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
446 if (h->avctx->debug & FF_DEBUG_MMCO)
447 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
449 pic = find_short(h, frame_num, &i);
451 if (unreference_pic(h, pic, ref_mask))
452 remove_short_at_index(h, i);
459 * Remove a picture from the long term reference list by its index in
461 * @return the removed picture or NULL if an error occurs
463 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
467 pic = h->long_ref[i];
469 if (unreference_pic(h, pic, ref_mask)) {
470 assert(h->long_ref[i]->long_ref == 1);
471 h->long_ref[i]->long_ref = 0;
472 h->long_ref[i] = NULL;
480 void ff_h264_remove_all_refs(H264Context *h)
484 for (i = 0; i < 16; i++) {
485 remove_long(h, i, 0);
487 assert(h->long_ref_count == 0);
489 for (i = 0; i < h->short_ref_count; i++) {
490 unreference_pic(h, h->short_ref[i], 0);
491 h->short_ref[i] = NULL;
493 h->short_ref_count = 0;
497 * print short term list
499 static void print_short_term(H264Context *h)
502 if (h->avctx->debug & FF_DEBUG_MMCO) {
503 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
504 for (i = 0; i < h->short_ref_count; i++) {
505 H264Picture *pic = h->short_ref[i];
506 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
507 i, pic->frame_num, pic->poc, pic->f->data[0]);
513 * print long term list
515 static void print_long_term(H264Context *h)
518 if (h->avctx->debug & FF_DEBUG_MMCO) {
519 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
520 for (i = 0; i < 16; i++) {
521 H264Picture *pic = h->long_ref[i];
523 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
524 i, pic->frame_num, pic->poc, pic->f->data[0]);
530 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
534 for (i = 0; i < n_mmcos; i++) {
535 if (mmco1[i].opcode != mmco2[i].opcode)
542 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
544 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
545 int mmco_index = 0, i = 0;
547 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
549 if (h->short_ref_count &&
550 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
551 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
552 mmco[0].opcode = MMCO_SHORT2UNUSED;
553 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
555 if (FIELD_PICTURE(h)) {
556 mmco[0].short_pic_num *= 2;
557 mmco[1].opcode = MMCO_SHORT2UNUSED;
558 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
564 h->mmco_index = mmco_index;
565 } else if (!first_slice && mmco_index >= 0 &&
566 (mmco_index != h->mmco_index ||
567 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
568 av_log(h->avctx, AV_LOG_ERROR,
569 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
570 mmco_index, h->mmco_index, i);
571 return AVERROR_INVALIDDATA;
576 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
579 int current_ref_assigned = 0, err = 0;
580 H264Picture *av_uninit(pic);
582 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
583 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
585 for (i = 0; i < mmco_count; i++) {
586 int av_uninit(structure), av_uninit(frame_num);
587 if (h->avctx->debug & FF_DEBUG_MMCO)
588 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
589 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
591 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
592 mmco[i].opcode == MMCO_SHORT2LONG) {
593 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
594 pic = find_short(h, frame_num, &j);
596 if (mmco[i].opcode != MMCO_SHORT2LONG ||
597 !h->long_ref[mmco[i].long_arg] ||
598 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
599 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
600 err = AVERROR_INVALIDDATA;
606 switch (mmco[i].opcode) {
607 case MMCO_SHORT2UNUSED:
608 if (h->avctx->debug & FF_DEBUG_MMCO)
609 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
610 h->mmco[i].short_pic_num, h->short_ref_count);
611 remove_short(h, frame_num, structure ^ PICT_FRAME);
613 case MMCO_SHORT2LONG:
614 if (h->long_ref[mmco[i].long_arg] != pic)
615 remove_long(h, mmco[i].long_arg, 0);
617 remove_short_at_index(h, j);
618 h->long_ref[ mmco[i].long_arg ] = pic;
619 if (h->long_ref[mmco[i].long_arg]) {
620 h->long_ref[mmco[i].long_arg]->long_ref = 1;
624 case MMCO_LONG2UNUSED:
625 j = pic_num_extract(h, mmco[i].long_arg, &structure);
626 pic = h->long_ref[j];
628 remove_long(h, j, structure ^ PICT_FRAME);
629 } else if (h->avctx->debug & FF_DEBUG_MMCO)
630 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
633 // Comment below left from previous code as it is an interresting note.
634 /* First field in pair is in short term list or
635 * at a different long term index.
636 * This is not allowed; see 7.4.3.3, notes 2 and 3.
637 * Report the problem and keep the pair where it is,
638 * and mark this field valid.
640 if (h->short_ref[0] == h->cur_pic_ptr)
641 remove_short_at_index(h, 0);
643 /* make sure the current picture is not already assigned as a long ref */
644 if (h->cur_pic_ptr->long_ref) {
645 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
646 if (h->long_ref[j] == h->cur_pic_ptr)
647 remove_long(h, j, 0);
652 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
653 remove_long(h, mmco[i].long_arg, 0);
655 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
656 h->long_ref[mmco[i].long_arg]->long_ref = 1;
660 h->cur_pic_ptr->reference |= h->picture_structure;
661 current_ref_assigned = 1;
663 case MMCO_SET_MAX_LONG:
664 assert(mmco[i].long_arg <= 16);
665 // just remove the long term which index is greater than new max
666 for (j = mmco[i].long_arg; j < 16; j++) {
667 remove_long(h, j, 0);
671 while (h->short_ref_count) {
672 remove_short(h, h->short_ref[0]->frame_num, 0);
674 for (j = 0; j < 16; j++) {
675 remove_long(h, j, 0);
677 h->frame_num = h->cur_pic_ptr->frame_num = 0;
679 h->cur_pic_ptr->mmco_reset = 1;
685 if (!current_ref_assigned) {
686 /* Second field of complementary field pair; the first field of
687 * which is already referenced. If short referenced, it
688 * should be first entry in short_ref. If not, it must exist
689 * in long_ref; trying to put it on the short list here is an
690 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
692 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
693 /* Just mark the second field valid */
694 h->cur_pic_ptr->reference = PICT_FRAME;
695 } else if (h->cur_pic_ptr->long_ref) {
696 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
697 "assignment for second field "
698 "in complementary field pair "
699 "(first field is long term)\n");
700 err = AVERROR_INVALIDDATA;
702 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
704 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
705 err = AVERROR_INVALIDDATA;
708 if (h->short_ref_count)
709 memmove(&h->short_ref[1], &h->short_ref[0],
710 h->short_ref_count * sizeof(H264Picture*));
712 h->short_ref[0] = h->cur_pic_ptr;
713 h->short_ref_count++;
714 h->cur_pic_ptr->reference |= h->picture_structure;
718 if (h->long_ref_count + h->short_ref_count -
719 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
721 /* We have too many reference frames, probably due to corrupted
722 * stream. Need to discard one frame. Prevents overrun of the
723 * short_ref and long_ref buffers.
725 av_log(h->avctx, AV_LOG_ERROR,
726 "number of reference frames (%d+%d) exceeds max (%d; probably "
727 "corrupt input), discarding one\n",
728 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
729 err = AVERROR_INVALIDDATA;
731 if (h->long_ref_count && !h->short_ref_count) {
732 for (i = 0; i < 16; ++i)
737 remove_long(h, i, 0);
739 pic = h->short_ref[h->short_ref_count - 1];
740 remove_short(h, pic->frame_num, 0);
746 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
749 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
753 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
756 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
757 skip_bits1(gb); // broken_link
759 mmco[0].opcode = MMCO_LONG;
760 mmco[0].long_arg = 0;
764 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
765 for (i = 0; i < MAX_MMCO_COUNT; i++) {
766 MMCOOpcode opcode = get_ue_golomb_31(gb);
768 mmco[i].opcode = opcode;
769 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
770 mmco[i].short_pic_num =
771 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
772 (h->max_pic_num - 1);
774 if (mmco[i].short_pic_num >= h->short_ref_count ||
775 !h->short_ref[mmco[i].short_pic_num]) {
776 av_log(s->avctx, AV_LOG_ERROR,
777 "illegal short ref in memory management control "
778 "operation %d\n", mmco);
783 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
784 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
785 unsigned int long_arg = get_ue_golomb_31(gb);
786 if (long_arg >= 32 ||
787 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
789 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
790 av_log(h->avctx, AV_LOG_ERROR,
791 "illegal long ref in memory management control "
792 "operation %d\n", opcode);
795 mmco[i].long_arg = long_arg;
798 if (opcode > (unsigned) MMCO_LONG) {
799 av_log(h->avctx, AV_LOG_ERROR,
800 "illegal memory management control operation %d\n",
804 if (opcode == MMCO_END)
810 ret = ff_generate_sliding_window_mmcos(h, first_slice);
811 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
818 if (first_slice && mmco_index != -1) {
819 h->mmco_index = mmco_index;
820 } else if (!first_slice && mmco_index >= 0 &&
821 (mmco_index != h->mmco_index ||
822 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
823 av_log(h->avctx, AV_LOG_ERROR,
824 "Inconsistent MMCO state between slices [%d, %d]\n",
825 mmco_index, h->mmco_index);
826 return AVERROR_INVALIDDATA;