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>
30 #include "libavutil/avassert.h"
35 #include "mpegutils.h"
39 static void pic_as_field(H264Ref *pic, const int parity)
42 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
43 if (parity == PICT_BOTTOM_FIELD)
44 pic->data[i] += pic->linesize[i];
45 pic->reference = parity;
46 pic->linesize[i] *= 2;
48 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
51 static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
53 memcpy(dst->data, src->f->data, sizeof(dst->data));
54 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
55 dst->reference = src->reference;
57 dst->pic_id = src->pic_id;
61 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
63 int match = !!(src->reference & parity);
66 ref_from_h264pic(dest, src);
67 if (parity != PICT_FRAME) {
68 pic_as_field(dest, parity);
70 dest->pic_id += id_add;
77 static int build_def_list(H264Ref *def, int def_len,
78 H264Picture **in, int len, int is_long, int sel)
83 while (i[0] < len || i[1] < len) {
84 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
86 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
89 av_assert0(index < def_len);
90 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
91 split_field_copy(&def[index++], in[i[0]++], sel, 1);
94 av_assert0(index < def_len);
95 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
96 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
103 static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir)
109 best_poc = dir ? INT_MIN : INT_MAX;
111 for (i = 0; i < len; i++) {
112 const int poc = src[i]->poc;
113 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
115 sorted[out_i] = src[i];
118 if (best_poc == (dir ? INT_MIN : INT_MAX))
120 limit = sorted[out_i++]->poc - dir;
125 static int mismatches_ref(H264Context *h, H264Picture *pic)
128 return (h->cur_pic_ptr->f->width != f->width ||
129 h->cur_pic_ptr->f->height != f->height ||
130 h->cur_pic_ptr->f->format != f->format);
133 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
138 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
139 H264Picture *sorted[32];
143 if (FIELD_PICTURE(h))
144 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
146 cur_poc = h->cur_pic_ptr->poc;
148 for (list = 0; list < 2; list++) {
149 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
150 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
151 av_assert0(len <= 32);
153 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
154 sorted, len, 0, h->picture_structure);
155 len += build_def_list(sl->ref_list[list] + len,
156 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
157 h->long_ref, 16, 1, h->picture_structure);
158 av_assert0(len <= 32);
160 if (len < sl->ref_count[list])
161 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
165 if (lens[0] == lens[1] && lens[1] > 1) {
166 for (i = 0; i < lens[0] &&
167 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
168 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
170 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
174 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
175 h->short_ref, h->short_ref_count, 0, h->picture_structure);
176 len += build_def_list(sl->ref_list[0] + len,
177 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
178 h-> long_ref, 16, 1, h->picture_structure);
179 av_assert0(len <= 32);
181 if (len < sl->ref_count[0])
182 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
185 for (i = 0; i < sl->ref_count[0]; i++) {
186 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
187 (sl->ref_list[0][i].long_ref ? "LT" : "ST"),
188 sl->ref_list[0][i].pic_id,
189 sl->ref_list[0][i].f->data[0]);
191 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
192 for (i = 0; i < sl->ref_count[1]; i++) {
193 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
194 (sl->ref_list[1][i].long_ref ? "LT" : "ST"),
195 sl->ref_list[1][i].pic_id,
196 sl->ref_list[1][i].f->data[0]);
201 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
202 for (i = 0; i < sl->ref_count[j]; i++) {
203 if (sl->ref_list[j][i].parent) {
204 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
205 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
206 memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
213 static void print_short_term(H264Context *h);
214 static void print_long_term(H264Context *h);
217 * Extract structure information about the picture described by pic_num in
218 * the current decoding context (frame or field). Note that pic_num is
219 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
220 * @param pic_num picture number for which to extract structure information
221 * @param structure one of PICT_XXX describing structure of picture
223 * @return frame number (short term) or long term index of picture
224 * described by pic_num
226 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
228 *structure = h->picture_structure;
229 if (FIELD_PICTURE(h)) {
232 *structure ^= PICT_FRAME;
239 int ff_h264_decode_ref_pic_list_reordering(H264Context *h, H264SliceContext *sl)
241 int list, index, pic_structure;
246 h264_initialise_ref_list(h, sl);
248 for (list = 0; list < sl->list_count; list++) {
249 if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
250 int pred = h->curr_pic_num;
252 for (index = 0; ; index++) {
253 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
256 H264Picture *ref = NULL;
258 if (modification_of_pic_nums_idc == 3)
261 if (index >= sl->ref_count[list]) {
262 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
266 switch (modification_of_pic_nums_idc) {
269 const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
272 if (abs_diff_pic_num > h->max_pic_num) {
273 av_log(h->avctx, AV_LOG_ERROR,
274 "abs_diff_pic_num overflow\n");
275 return AVERROR_INVALIDDATA;
278 if (modification_of_pic_nums_idc == 0)
279 pred -= abs_diff_pic_num;
281 pred += abs_diff_pic_num;
282 pred &= h->max_pic_num - 1;
284 frame_num = pic_num_extract(h, pred, &pic_structure);
286 for (i = h->short_ref_count - 1; i >= 0; i--) {
287 ref = h->short_ref[i];
288 assert(ref->reference);
289 assert(!ref->long_ref);
290 if (ref->frame_num == frame_num &&
291 (ref->reference & pic_structure))
300 pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
302 long_idx = pic_num_extract(h, pic_id, &pic_structure);
305 av_log(h->avctx, AV_LOG_ERROR,
306 "long_term_pic_idx overflow\n");
307 return AVERROR_INVALIDDATA;
309 ref = h->long_ref[long_idx];
310 assert(!(ref && !ref->reference));
311 if (ref && (ref->reference & pic_structure) && !mismatches_ref(h, ref)) {
312 ref->pic_id = pic_id;
313 assert(ref->long_ref);
321 av_log(h->avctx, AV_LOG_ERROR,
322 "illegal modification_of_pic_nums_idc %u\n",
323 modification_of_pic_nums_idc);
324 return AVERROR_INVALIDDATA;
328 av_log(h->avctx, AV_LOG_ERROR,
329 "reference picture missing during reorder\n");
330 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
332 for (i = index; i + 1 < sl->ref_count[list]; i++) {
333 if (sl->ref_list[list][i].parent &&
334 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
335 ref->pic_id == sl->ref_list[list][i].pic_id)
338 for (; i > index; i--) {
339 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
341 ref_from_h264pic(&sl->ref_list[list][index], ref);
342 if (FIELD_PICTURE(h)) {
343 pic_as_field(&sl->ref_list[list][index], pic_structure);
349 for (list = 0; list < sl->list_count; list++) {
350 for (index = 0; index < sl->ref_count[list]; index++) {
351 if ( !sl->ref_list[list][index].parent
352 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
354 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
355 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
356 h->last_pocs[i] = INT_MIN;
359 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
366 void ff_h264_fill_mbaff_ref_list(H264Context *h, H264SliceContext *sl)
369 for (list = 0; list < sl->list_count; list++) {
370 for (i = 0; i < sl->ref_count[list]; i++) {
371 H264Ref *frame = &sl->ref_list[list][i];
372 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
376 for (j = 0; j < 3; j++)
377 field[0].linesize[j] <<= 1;
378 field[0].reference = PICT_TOP_FIELD;
379 field[0].poc = field[0].parent->field_poc[0];
383 for (j = 0; j < 3; j++)
384 field[1].data[j] += frame->parent->f->linesize[j];
385 field[1].reference = PICT_BOTTOM_FIELD;
386 field[1].poc = field[1].parent->field_poc[1];
388 sl->luma_weight[16 + 2 * i][list][0] = sl->luma_weight[16 + 2 * i + 1][list][0] = sl->luma_weight[i][list][0];
389 sl->luma_weight[16 + 2 * i][list][1] = sl->luma_weight[16 + 2 * i + 1][list][1] = sl->luma_weight[i][list][1];
390 for (j = 0; j < 2; j++) {
391 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];
392 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];
399 * Mark a picture as no longer needed for reference. The refmask
400 * argument allows unreferencing of individual fields or the whole frame.
401 * If the picture becomes entirely unreferenced, but is being held for
402 * display purposes, it is marked as such.
403 * @param refmask mask of fields to unreference; the mask is bitwise
404 * anded with the reference marking of pic
405 * @return non-zero if pic becomes entirely unreferenced (except possibly
406 * for display purposes) zero if one of the fields remains in
409 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
412 if (pic->reference &= refmask) {
415 for(i = 0; h->delayed_pic[i]; i++)
416 if(pic == h->delayed_pic[i]){
417 pic->reference = DELAYED_PIC_REF;
425 * Find a H264Picture in the short term reference list by frame number.
426 * @param frame_num frame number to search for
427 * @param idx the index into h->short_ref where returned picture is found
428 * undefined if no picture found.
429 * @return pointer to the found picture, or NULL if no pic with the provided
430 * frame number is found
432 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
436 for (i = 0; i < h->short_ref_count; i++) {
437 H264Picture *pic = h->short_ref[i];
438 if (h->avctx->debug & FF_DEBUG_MMCO)
439 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
440 if (pic->frame_num == frame_num) {
449 * Remove a picture from the short term reference list by its index in
450 * that list. This does no checking on the provided index; it is assumed
451 * to be valid. Other list entries are shifted down.
452 * @param i index into h->short_ref of picture to remove.
454 static void remove_short_at_index(H264Context *h, int i)
456 assert(i >= 0 && i < h->short_ref_count);
457 h->short_ref[i] = NULL;
458 if (--h->short_ref_count)
459 memmove(&h->short_ref[i], &h->short_ref[i + 1],
460 (h->short_ref_count - i) * sizeof(H264Picture*));
465 * @return the removed picture or NULL if an error occurs
467 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
472 if (h->avctx->debug & FF_DEBUG_MMCO)
473 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
475 pic = find_short(h, frame_num, &i);
477 if (unreference_pic(h, pic, ref_mask))
478 remove_short_at_index(h, i);
485 * Remove a picture from the long term reference list by its index in
487 * @return the removed picture or NULL if an error occurs
489 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
493 pic = h->long_ref[i];
495 if (unreference_pic(h, pic, ref_mask)) {
496 assert(h->long_ref[i]->long_ref == 1);
497 h->long_ref[i]->long_ref = 0;
498 h->long_ref[i] = NULL;
506 void ff_h264_remove_all_refs(H264Context *h)
510 for (i = 0; i < 16; i++) {
511 remove_long(h, i, 0);
513 assert(h->long_ref_count == 0);
515 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
516 ff_h264_unref_picture(h, &h->last_pic_for_ec);
517 if (h->short_ref[0]->f->buf[0])
518 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
521 for (i = 0; i < h->short_ref_count; i++) {
522 unreference_pic(h, h->short_ref[i], 0);
523 h->short_ref[i] = NULL;
525 h->short_ref_count = 0;
527 for (i = 0; i < h->nb_slice_ctx; i++) {
528 H264SliceContext *sl = &h->slice_ctx[i];
529 sl->list_count = sl->ref_count[0] = sl->ref_count[1] = 0;
530 memset(sl->ref_list, 0, sizeof(sl->ref_list));
535 * print short term list
537 static void print_short_term(H264Context *h)
540 if (h->avctx->debug & FF_DEBUG_MMCO) {
541 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
542 for (i = 0; i < h->short_ref_count; i++) {
543 H264Picture *pic = h->short_ref[i];
544 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
545 i, pic->frame_num, pic->poc, pic->f->data[0]);
551 * print long term list
553 static void print_long_term(H264Context *h)
556 if (h->avctx->debug & FF_DEBUG_MMCO) {
557 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
558 for (i = 0; i < 16; i++) {
559 H264Picture *pic = h->long_ref[i];
561 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
562 i, pic->frame_num, pic->poc, pic->f->data[0]);
568 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
572 for (i = 0; i < n_mmcos; i++) {
573 if (mmco1[i].opcode != mmco2[i].opcode) {
574 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
575 mmco1[i].opcode, mmco2[i].opcode, i);
583 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
585 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
586 int mmco_index = 0, i = 0;
588 if (h->short_ref_count &&
589 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
590 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
591 mmco[0].opcode = MMCO_SHORT2UNUSED;
592 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
594 if (FIELD_PICTURE(h)) {
595 mmco[0].short_pic_num *= 2;
596 mmco[1].opcode = MMCO_SHORT2UNUSED;
597 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
603 h->mmco_index = mmco_index;
604 } else if (!first_slice && mmco_index >= 0 &&
605 (mmco_index != h->mmco_index ||
606 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
607 av_log(h->avctx, AV_LOG_ERROR,
608 "Inconsistent MMCO state between slices [%d, %d]\n",
609 mmco_index, h->mmco_index);
610 return AVERROR_INVALIDDATA;
615 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
619 int pps_ref_count[2] = {0};
620 int current_ref_assigned = 0, err = 0;
621 H264Picture *av_uninit(pic);
623 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
624 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
626 for (i = 0; i < mmco_count; i++) {
627 int av_uninit(structure), av_uninit(frame_num);
628 if (h->avctx->debug & FF_DEBUG_MMCO)
629 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
630 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
632 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
633 mmco[i].opcode == MMCO_SHORT2LONG) {
634 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
635 pic = find_short(h, frame_num, &j);
637 if (mmco[i].opcode != MMCO_SHORT2LONG ||
638 !h->long_ref[mmco[i].long_arg] ||
639 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
640 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
641 err = AVERROR_INVALIDDATA;
647 switch (mmco[i].opcode) {
648 case MMCO_SHORT2UNUSED:
649 if (h->avctx->debug & FF_DEBUG_MMCO)
650 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
651 h->mmco[i].short_pic_num, h->short_ref_count);
652 remove_short(h, frame_num, structure ^ PICT_FRAME);
654 case MMCO_SHORT2LONG:
655 if (h->long_ref[mmco[i].long_arg] != pic)
656 remove_long(h, mmco[i].long_arg, 0);
658 remove_short_at_index(h, j);
659 h->long_ref[ mmco[i].long_arg ] = pic;
660 if (h->long_ref[mmco[i].long_arg]) {
661 h->long_ref[mmco[i].long_arg]->long_ref = 1;
665 case MMCO_LONG2UNUSED:
666 j = pic_num_extract(h, mmco[i].long_arg, &structure);
667 pic = h->long_ref[j];
669 remove_long(h, j, structure ^ PICT_FRAME);
670 } else if (h->avctx->debug & FF_DEBUG_MMCO)
671 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
674 // Comment below left from previous code as it is an interresting note.
675 /* First field in pair is in short term list or
676 * at a different long term index.
677 * This is not allowed; see 7.4.3.3, notes 2 and 3.
678 * Report the problem and keep the pair where it is,
679 * and mark this field valid.
681 if (h->short_ref[0] == h->cur_pic_ptr) {
682 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
683 remove_short_at_index(h, 0);
686 /* make sure the current picture is not already assigned as a long ref */
687 if (h->cur_pic_ptr->long_ref) {
688 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
689 if (h->long_ref[j] == h->cur_pic_ptr) {
690 if (j != mmco[i].long_arg)
691 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
692 remove_long(h, j, 0);
697 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
698 av_assert0(!h->cur_pic_ptr->long_ref);
699 remove_long(h, mmco[i].long_arg, 0);
701 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
702 h->long_ref[mmco[i].long_arg]->long_ref = 1;
706 h->cur_pic_ptr->reference |= h->picture_structure;
707 current_ref_assigned = 1;
709 case MMCO_SET_MAX_LONG:
710 assert(mmco[i].long_arg <= 16);
711 // just remove the long term which index is greater than new max
712 for (j = mmco[i].long_arg; j < 16; j++) {
713 remove_long(h, j, 0);
717 while (h->short_ref_count) {
718 remove_short(h, h->short_ref[0]->frame_num, 0);
720 for (j = 0; j < 16; j++) {
721 remove_long(h, j, 0);
723 h->frame_num = h->cur_pic_ptr->frame_num = 0;
725 h->cur_pic_ptr->mmco_reset = 1;
726 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
727 h->last_pocs[j] = INT_MIN;
733 if (!current_ref_assigned) {
734 /* Second field of complementary field pair; the first field of
735 * which is already referenced. If short referenced, it
736 * should be first entry in short_ref. If not, it must exist
737 * in long_ref; trying to put it on the short list here is an
738 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
740 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
741 /* Just mark the second field valid */
742 h->cur_pic_ptr->reference |= h->picture_structure;
743 } else if (h->cur_pic_ptr->long_ref) {
744 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
745 "assignment for second field "
746 "in complementary field pair "
747 "(first field is long term)\n");
748 err = AVERROR_INVALIDDATA;
750 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
752 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
753 err = AVERROR_INVALIDDATA;
756 if (h->short_ref_count)
757 memmove(&h->short_ref[1], &h->short_ref[0],
758 h->short_ref_count * sizeof(H264Picture*));
760 h->short_ref[0] = h->cur_pic_ptr;
761 h->short_ref_count++;
762 h->cur_pic_ptr->reference |= h->picture_structure;
766 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
768 /* We have too many reference frames, probably due to corrupted
769 * stream. Need to discard one frame. Prevents overrun of the
770 * short_ref and long_ref buffers.
772 av_log(h->avctx, AV_LOG_ERROR,
773 "number of reference frames (%d+%d) exceeds max (%d; probably "
774 "corrupt input), discarding one\n",
775 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
776 err = AVERROR_INVALIDDATA;
778 if (h->long_ref_count && !h->short_ref_count) {
779 for (i = 0; i < 16; ++i)
784 remove_long(h, i, 0);
786 pic = h->short_ref[h->short_ref_count - 1];
787 remove_short(h, pic->frame_num, 0);
791 for (i = 0; i<h->short_ref_count; i++) {
792 pic = h->short_ref[i];
793 if (pic->invalid_gap) {
794 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->sps.log2_max_frame_num);
795 if (d > h->sps.ref_frame_count)
796 remove_short(h, pic->frame_num, 0);
804 for (i = 0; i < FF_ARRAY_ELEMS(h->pps_buffers); i++) {
805 pps_count += !!h->pps_buffers[i];
806 pps_ref_count[0] = FFMAX(pps_ref_count[0], h->pps.ref_count[0]);
807 pps_ref_count[1] = FFMAX(pps_ref_count[1], h->pps.ref_count[1]);
811 && h->long_ref_count==0
812 && ( h->short_ref_count<=2
813 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
814 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
815 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
816 h->cur_pic_ptr->recovered |= 1;
817 if(!h->avctx->has_b_frames)
818 h->frame_recovered |= FRAME_RECOVERED_SEI;
821 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
824 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
828 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
831 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
832 skip_bits1(gb); // broken_link
834 mmco[0].opcode = MMCO_LONG;
835 mmco[0].long_arg = 0;
839 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
840 for (i = 0; i < MAX_MMCO_COUNT; i++) {
841 MMCOOpcode opcode = get_ue_golomb_31(gb);
843 mmco[i].opcode = opcode;
844 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
845 mmco[i].short_pic_num =
846 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
847 (h->max_pic_num - 1);
849 if (mmco[i].short_pic_num >= h->short_ref_count ||
850 !h->short_ref[mmco[i].short_pic_num]) {
851 av_log(s->avctx, AV_LOG_ERROR,
852 "illegal short ref in memory management control "
853 "operation %d\n", mmco);
858 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
859 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
860 unsigned int long_arg = get_ue_golomb_31(gb);
861 if (long_arg >= 32 ||
862 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
864 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
865 av_log(h->avctx, AV_LOG_ERROR,
866 "illegal long ref in memory management control "
867 "operation %d\n", opcode);
870 mmco[i].long_arg = long_arg;
873 if (opcode > (unsigned) MMCO_LONG) {
874 av_log(h->avctx, AV_LOG_ERROR,
875 "illegal memory management control operation %d\n",
879 if (opcode == MMCO_END)
885 ret = ff_generate_sliding_window_mmcos(h, first_slice);
886 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
893 if (first_slice && mmco_index != -1) {
894 memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
895 h->mmco_index = mmco_index;
896 } else if (!first_slice && mmco_index >= 0 &&
897 (mmco_index != h->mmco_index ||
898 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
899 av_log(h->avctx, AV_LOG_ERROR,
900 "Inconsistent MMCO state between slices [%d, %d]\n",
901 mmco_index, h->mmco_index);
902 return AVERROR_INVALIDDATA;