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 int ff_h264_fill_default_ref_list(H264Context *h, H264SliceContext *sl)
130 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
131 H264Picture *sorted[32];
135 if (FIELD_PICTURE(h))
136 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
138 cur_poc = h->cur_pic_ptr->poc;
140 for (list = 0; list < 2; list++) {
141 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
142 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
143 av_assert0(len <= 32);
145 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]),
146 sorted, len, 0, h->picture_structure);
147 len += build_def_list(h->default_ref_list[list] + len,
148 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
149 h->long_ref, 16, 1, h->picture_structure);
150 av_assert0(len <= 32);
152 if (len < sl->ref_count[list])
153 memset(&h->default_ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
157 if (lens[0] == lens[1] && lens[1] > 1) {
158 for (i = 0; i < lens[0] &&
159 h->default_ref_list[0][i].parent->f->buf[0]->buffer ==
160 h->default_ref_list[1][i].parent->f->buf[0]->buffer; i++);
162 FFSWAP(H264Ref, h->default_ref_list[1][0], h->default_ref_list[1][1]);
166 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]),
167 h->short_ref, h->short_ref_count, 0, h->picture_structure);
168 len += build_def_list(h->default_ref_list[0] + len,
169 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
170 h-> long_ref, 16, 1, h->picture_structure);
171 av_assert0(len <= 32);
173 if (len < sl->ref_count[0])
174 memset(&h->default_ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
177 for (i = 0; i < sl->ref_count[0]; i++) {
178 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
179 h->default_ref_list[0][i].parent ? (h->default_ref_list[0][i].parent->long_ref ? "LT" : "ST") : "NULL",
180 h->default_ref_list[0][i].pic_id,
181 h->default_ref_list[0][i].parent ? h->default_ref_list[0][i].parent->f->data[0] : 0);
183 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
184 for (i = 0; i < sl->ref_count[1]; i++) {
185 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
186 h->default_ref_list[1][i].parent ? (h->default_ref_list[1][i].parent->long_ref ? "LT" : "ST") : "NULL",
187 h->default_ref_list[1][i].pic_id,
188 h->default_ref_list[1][i].parent ? h->default_ref_list[1][i].parent->f->data[0] : 0);
193 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
194 for (i = 0; i < sl->ref_count[j]; i++) {
195 if (h->default_ref_list[j][i].parent) {
196 AVFrame *f = h->default_ref_list[j][i].parent->f;
197 if (h->cur_pic_ptr->f->width != f->width ||
198 h->cur_pic_ptr->f->height != f->height ||
199 h->cur_pic_ptr->f->format != f->format) {
200 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
201 memset(&h->default_ref_list[j][i], 0, sizeof(h->default_ref_list[j][i]));
210 static void print_short_term(H264Context *h);
211 static void print_long_term(H264Context *h);
214 * Extract structure information about the picture described by pic_num in
215 * the current decoding context (frame or field). Note that pic_num is
216 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
217 * @param pic_num picture number for which to extract structure information
218 * @param structure one of PICT_XXX describing structure of picture
220 * @return frame number (short term) or long term index of picture
221 * described by pic_num
223 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
225 *structure = h->picture_structure;
226 if (FIELD_PICTURE(h)) {
229 *structure ^= PICT_FRAME;
236 int ff_h264_decode_ref_pic_list_reordering(H264Context *h, H264SliceContext *sl)
238 int list, index, pic_structure;
243 for (list = 0; list < sl->list_count; list++) {
244 memcpy(sl->ref_list[list], h->default_ref_list[list], sl->ref_count[list] * sizeof(sl->ref_list[0][0]));
246 if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
247 int pred = h->curr_pic_num;
249 for (index = 0; ; index++) {
250 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
253 H264Picture *ref = NULL;
255 if (modification_of_pic_nums_idc == 3)
258 if (index >= sl->ref_count[list]) {
259 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
263 switch (modification_of_pic_nums_idc) {
266 const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
269 if (abs_diff_pic_num > h->max_pic_num) {
270 av_log(h->avctx, AV_LOG_ERROR,
271 "abs_diff_pic_num overflow\n");
272 return AVERROR_INVALIDDATA;
275 if (modification_of_pic_nums_idc == 0)
276 pred -= abs_diff_pic_num;
278 pred += abs_diff_pic_num;
279 pred &= h->max_pic_num - 1;
281 frame_num = pic_num_extract(h, pred, &pic_structure);
283 for (i = h->short_ref_count - 1; i >= 0; i--) {
284 ref = h->short_ref[i];
285 assert(ref->reference);
286 assert(!ref->long_ref);
287 if (ref->frame_num == frame_num &&
288 (ref->reference & pic_structure))
297 pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
299 long_idx = pic_num_extract(h, pic_id, &pic_structure);
302 av_log(h->avctx, AV_LOG_ERROR,
303 "long_term_pic_idx overflow\n");
304 return AVERROR_INVALIDDATA;
306 ref = h->long_ref[long_idx];
307 assert(!(ref && !ref->reference));
308 if (ref && (ref->reference & pic_structure)) {
309 ref->pic_id = pic_id;
310 assert(ref->long_ref);
318 av_log(h->avctx, AV_LOG_ERROR,
319 "illegal modification_of_pic_nums_idc %u\n",
320 modification_of_pic_nums_idc);
321 return AVERROR_INVALIDDATA;
325 av_log(h->avctx, AV_LOG_ERROR,
326 "reference picture missing during reorder\n");
327 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
329 for (i = index; i + 1 < sl->ref_count[list]; i++) {
330 if (sl->ref_list[list][i].parent &&
331 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
332 ref->pic_id == sl->ref_list[list][i].pic_id)
335 for (; i > index; i--) {
336 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
338 ref_from_h264pic(&sl->ref_list[list][index], ref);
339 if (FIELD_PICTURE(h)) {
340 pic_as_field(&sl->ref_list[list][index], pic_structure);
346 for (list = 0; list < sl->list_count; list++) {
347 for (index = 0; index < sl->ref_count[list]; index++) {
348 if ( !sl->ref_list[list][index].parent
349 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
351 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
352 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
353 h->last_pocs[i] = INT_MIN;
354 if (h->default_ref_list[list][0].parent
355 && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3))
356 sl->ref_list[list][index] = h->default_ref_list[list][0];
360 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
367 void ff_h264_fill_mbaff_ref_list(H264Context *h, H264SliceContext *sl)
370 for (list = 0; list < sl->list_count; list++) {
371 for (i = 0; i < sl->ref_count[list]; i++) {
372 H264Ref *frame = &sl->ref_list[list][i];
373 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
377 for (j = 0; j < 3; j++)
378 field[0].linesize[j] <<= 1;
379 field[0].reference = PICT_TOP_FIELD;
380 field[0].poc = field[0].parent->field_poc[0];
384 for (j = 0; j < 3; j++)
385 field[1].data[j] += frame->parent->f->linesize[j];
386 field[1].reference = PICT_BOTTOM_FIELD;
387 field[1].poc = field[1].parent->field_poc[1];
389 sl->luma_weight[16 + 2 * i][list][0] = sl->luma_weight[16 + 2 * i + 1][list][0] = sl->luma_weight[i][list][0];
390 sl->luma_weight[16 + 2 * i][list][1] = sl->luma_weight[16 + 2 * i + 1][list][1] = sl->luma_weight[i][list][1];
391 for (j = 0; j < 2; j++) {
392 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];
393 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];
400 * Mark a picture as no longer needed for reference. The refmask
401 * argument allows unreferencing of individual fields or the whole frame.
402 * If the picture becomes entirely unreferenced, but is being held for
403 * display purposes, it is marked as such.
404 * @param refmask mask of fields to unreference; the mask is bitwise
405 * anded with the reference marking of pic
406 * @return non-zero if pic becomes entirely unreferenced (except possibly
407 * for display purposes) zero if one of the fields remains in
410 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
413 if (pic->reference &= refmask) {
416 for(i = 0; h->delayed_pic[i]; i++)
417 if(pic == h->delayed_pic[i]){
418 pic->reference = DELAYED_PIC_REF;
426 * Find a H264Picture in the short term reference list by frame number.
427 * @param frame_num frame number to search for
428 * @param idx the index into h->short_ref where returned picture is found
429 * undefined if no picture found.
430 * @return pointer to the found picture, or NULL if no pic with the provided
431 * frame number is found
433 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
437 for (i = 0; i < h->short_ref_count; i++) {
438 H264Picture *pic = h->short_ref[i];
439 if (h->avctx->debug & FF_DEBUG_MMCO)
440 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
441 if (pic->frame_num == frame_num) {
450 * Remove a picture from the short term reference list by its index in
451 * that list. This does no checking on the provided index; it is assumed
452 * to be valid. Other list entries are shifted down.
453 * @param i index into h->short_ref of picture to remove.
455 static void remove_short_at_index(H264Context *h, int i)
457 assert(i >= 0 && i < h->short_ref_count);
458 h->short_ref[i] = NULL;
459 if (--h->short_ref_count)
460 memmove(&h->short_ref[i], &h->short_ref[i + 1],
461 (h->short_ref_count - i) * sizeof(H264Picture*));
466 * @return the removed picture or NULL if an error occurs
468 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
473 if (h->avctx->debug & FF_DEBUG_MMCO)
474 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
476 pic = find_short(h, frame_num, &i);
478 if (unreference_pic(h, pic, ref_mask))
479 remove_short_at_index(h, i);
486 * Remove a picture from the long term reference list by its index in
488 * @return the removed picture or NULL if an error occurs
490 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
494 pic = h->long_ref[i];
496 if (unreference_pic(h, pic, ref_mask)) {
497 assert(h->long_ref[i]->long_ref == 1);
498 h->long_ref[i]->long_ref = 0;
499 h->long_ref[i] = NULL;
507 void ff_h264_remove_all_refs(H264Context *h)
511 for (i = 0; i < 16; i++) {
512 remove_long(h, i, 0);
514 assert(h->long_ref_count == 0);
516 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
517 ff_h264_unref_picture(h, &h->last_pic_for_ec);
518 if (h->short_ref[0]->f->buf[0])
519 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
522 for (i = 0; i < h->short_ref_count; i++) {
523 unreference_pic(h, h->short_ref[i], 0);
524 h->short_ref[i] = NULL;
526 h->short_ref_count = 0;
528 memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
529 for (i = 0; i < h->nb_slice_ctx; i++) {
530 H264SliceContext *sl = &h->slice_ctx[i];
531 sl->list_count = sl->ref_count[0] = sl->ref_count[1] = 0;
532 memset(sl->ref_list, 0, sizeof(sl->ref_list));
537 * print short term list
539 static void print_short_term(H264Context *h)
542 if (h->avctx->debug & FF_DEBUG_MMCO) {
543 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
544 for (i = 0; i < h->short_ref_count; i++) {
545 H264Picture *pic = h->short_ref[i];
546 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
547 i, pic->frame_num, pic->poc, pic->f->data[0]);
553 * print long term list
555 static void print_long_term(H264Context *h)
558 if (h->avctx->debug & FF_DEBUG_MMCO) {
559 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
560 for (i = 0; i < 16; i++) {
561 H264Picture *pic = h->long_ref[i];
563 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
564 i, pic->frame_num, pic->poc, pic->f->data[0]);
570 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
574 for (i = 0; i < n_mmcos; i++) {
575 if (mmco1[i].opcode != mmco2[i].opcode) {
576 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
577 mmco1[i].opcode, mmco2[i].opcode, i);
585 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
587 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
588 int mmco_index = 0, i = 0;
590 if (h->short_ref_count &&
591 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
592 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
593 mmco[0].opcode = MMCO_SHORT2UNUSED;
594 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
596 if (FIELD_PICTURE(h)) {
597 mmco[0].short_pic_num *= 2;
598 mmco[1].opcode = MMCO_SHORT2UNUSED;
599 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
605 h->mmco_index = mmco_index;
606 } else if (!first_slice && mmco_index >= 0 &&
607 (mmco_index != h->mmco_index ||
608 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
609 av_log(h->avctx, AV_LOG_ERROR,
610 "Inconsistent MMCO state between slices [%d, %d]\n",
611 mmco_index, h->mmco_index);
612 return AVERROR_INVALIDDATA;
617 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
621 int pps_ref_count[2] = {0};
622 int current_ref_assigned = 0, err = 0;
623 H264Picture *av_uninit(pic);
625 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
626 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
628 for (i = 0; i < mmco_count; i++) {
629 int av_uninit(structure), av_uninit(frame_num);
630 if (h->avctx->debug & FF_DEBUG_MMCO)
631 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
632 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
634 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
635 mmco[i].opcode == MMCO_SHORT2LONG) {
636 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
637 pic = find_short(h, frame_num, &j);
639 if (mmco[i].opcode != MMCO_SHORT2LONG ||
640 !h->long_ref[mmco[i].long_arg] ||
641 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
642 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
643 err = AVERROR_INVALIDDATA;
649 switch (mmco[i].opcode) {
650 case MMCO_SHORT2UNUSED:
651 if (h->avctx->debug & FF_DEBUG_MMCO)
652 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
653 h->mmco[i].short_pic_num, h->short_ref_count);
654 remove_short(h, frame_num, structure ^ PICT_FRAME);
656 case MMCO_SHORT2LONG:
657 if (h->long_ref[mmco[i].long_arg] != pic)
658 remove_long(h, mmco[i].long_arg, 0);
660 remove_short_at_index(h, j);
661 h->long_ref[ mmco[i].long_arg ] = pic;
662 if (h->long_ref[mmco[i].long_arg]) {
663 h->long_ref[mmco[i].long_arg]->long_ref = 1;
667 case MMCO_LONG2UNUSED:
668 j = pic_num_extract(h, mmco[i].long_arg, &structure);
669 pic = h->long_ref[j];
671 remove_long(h, j, structure ^ PICT_FRAME);
672 } else if (h->avctx->debug & FF_DEBUG_MMCO)
673 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
676 // Comment below left from previous code as it is an interresting note.
677 /* First field in pair is in short term list or
678 * at a different long term index.
679 * This is not allowed; see 7.4.3.3, notes 2 and 3.
680 * Report the problem and keep the pair where it is,
681 * and mark this field valid.
683 if (h->short_ref[0] == h->cur_pic_ptr) {
684 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
685 remove_short_at_index(h, 0);
688 /* make sure the current picture is not already assigned as a long ref */
689 if (h->cur_pic_ptr->long_ref) {
690 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
691 if (h->long_ref[j] == h->cur_pic_ptr) {
692 if (j != mmco[i].long_arg)
693 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
694 remove_long(h, j, 0);
699 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
700 av_assert0(!h->cur_pic_ptr->long_ref);
701 remove_long(h, mmco[i].long_arg, 0);
703 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
704 h->long_ref[mmco[i].long_arg]->long_ref = 1;
708 h->cur_pic_ptr->reference |= h->picture_structure;
709 current_ref_assigned = 1;
711 case MMCO_SET_MAX_LONG:
712 assert(mmco[i].long_arg <= 16);
713 // just remove the long term which index is greater than new max
714 for (j = mmco[i].long_arg; j < 16; j++) {
715 remove_long(h, j, 0);
719 while (h->short_ref_count) {
720 remove_short(h, h->short_ref[0]->frame_num, 0);
722 for (j = 0; j < 16; j++) {
723 remove_long(h, j, 0);
725 h->frame_num = h->cur_pic_ptr->frame_num = 0;
727 h->cur_pic_ptr->mmco_reset = 1;
728 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
729 h->last_pocs[j] = INT_MIN;
735 if (!current_ref_assigned) {
736 /* Second field of complementary field pair; the first field of
737 * which is already referenced. If short referenced, it
738 * should be first entry in short_ref. If not, it must exist
739 * in long_ref; trying to put it on the short list here is an
740 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
742 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
743 /* Just mark the second field valid */
744 h->cur_pic_ptr->reference |= h->picture_structure;
745 } else if (h->cur_pic_ptr->long_ref) {
746 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
747 "assignment for second field "
748 "in complementary field pair "
749 "(first field is long term)\n");
750 err = AVERROR_INVALIDDATA;
752 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
754 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
755 err = AVERROR_INVALIDDATA;
758 if (h->short_ref_count)
759 memmove(&h->short_ref[1], &h->short_ref[0],
760 h->short_ref_count * sizeof(H264Picture*));
762 h->short_ref[0] = h->cur_pic_ptr;
763 h->short_ref_count++;
764 h->cur_pic_ptr->reference |= h->picture_structure;
768 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
770 /* We have too many reference frames, probably due to corrupted
771 * stream. Need to discard one frame. Prevents overrun of the
772 * short_ref and long_ref buffers.
774 av_log(h->avctx, AV_LOG_ERROR,
775 "number of reference frames (%d+%d) exceeds max (%d; probably "
776 "corrupt input), discarding one\n",
777 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
778 err = AVERROR_INVALIDDATA;
780 if (h->long_ref_count && !h->short_ref_count) {
781 for (i = 0; i < 16; ++i)
786 remove_long(h, i, 0);
788 pic = h->short_ref[h->short_ref_count - 1];
789 remove_short(h, pic->frame_num, 0);
793 for (i = 0; i<h->short_ref_count; i++) {
794 pic = h->short_ref[i];
795 if (pic->invalid_gap) {
796 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->sps.log2_max_frame_num);
797 if (d > h->sps.ref_frame_count)
798 remove_short(h, pic->frame_num, 0);
806 for (i = 0; i < FF_ARRAY_ELEMS(h->pps_buffers); i++) {
807 pps_count += !!h->pps_buffers[i];
808 pps_ref_count[0] = FFMAX(pps_ref_count[0], h->pps.ref_count[0]);
809 pps_ref_count[1] = FFMAX(pps_ref_count[1], h->pps.ref_count[1]);
813 && h->long_ref_count==0
814 && ( h->short_ref_count<=2
815 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
816 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
817 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
818 h->cur_pic_ptr->recovered |= 1;
819 if(!h->avctx->has_b_frames)
820 h->frame_recovered |= FRAME_RECOVERED_SEI;
823 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
826 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
830 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
833 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
834 skip_bits1(gb); // broken_link
836 mmco[0].opcode = MMCO_LONG;
837 mmco[0].long_arg = 0;
841 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
842 for (i = 0; i < MAX_MMCO_COUNT; i++) {
843 MMCOOpcode opcode = get_ue_golomb_31(gb);
845 mmco[i].opcode = opcode;
846 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
847 mmco[i].short_pic_num =
848 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
849 (h->max_pic_num - 1);
851 if (mmco[i].short_pic_num >= h->short_ref_count ||
852 !h->short_ref[mmco[i].short_pic_num]) {
853 av_log(s->avctx, AV_LOG_ERROR,
854 "illegal short ref in memory management control "
855 "operation %d\n", mmco);
860 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
861 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
862 unsigned int long_arg = get_ue_golomb_31(gb);
863 if (long_arg >= 32 ||
864 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
866 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
867 av_log(h->avctx, AV_LOG_ERROR,
868 "illegal long ref in memory management control "
869 "operation %d\n", opcode);
872 mmco[i].long_arg = long_arg;
875 if (opcode > (unsigned) MMCO_LONG) {
876 av_log(h->avctx, AV_LOG_ERROR,
877 "illegal memory management control operation %d\n",
881 if (opcode == MMCO_END)
887 ret = ff_generate_sliding_window_mmcos(h, first_slice);
888 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
895 if (first_slice && mmco_index != -1) {
896 memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
897 h->mmco_index = mmco_index;
898 } else if (!first_slice && mmco_index >= 0 &&
899 (mmco_index != h->mmco_index ||
900 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
901 av_log(h->avctx, AV_LOG_ERROR,
902 "Inconsistent MMCO state between slices [%d, %d]\n",
903 mmco_index, h->mmco_index);
904 return AVERROR_INVALIDDATA;