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 / MPEG-4 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 * const *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 * const *src,
104 int len, int limit, int dir)
110 best_poc = dir ? INT_MIN : INT_MAX;
112 for (i = 0; i < len; i++) {
113 const int poc = src[i]->poc;
114 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
116 sorted[out_i] = src[i];
119 if (best_poc == (dir ? INT_MIN : INT_MAX))
121 limit = sorted[out_i++]->poc - dir;
126 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
128 const AVFrame *f = pic->f;
129 return (h->cur_pic_ptr->f->width != f->width ||
130 h->cur_pic_ptr->f->height != f->height ||
131 h->cur_pic_ptr->f->format != f->format);
134 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
139 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
140 H264Picture *sorted[32];
144 if (FIELD_PICTURE(h))
145 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
147 cur_poc = h->cur_pic_ptr->poc;
149 for (list = 0; list < 2; list++) {
150 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
151 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
152 av_assert0(len <= 32);
154 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
155 sorted, len, 0, h->picture_structure);
156 len += build_def_list(sl->ref_list[list] + len,
157 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
158 h->long_ref, 16, 1, h->picture_structure);
159 av_assert0(len <= 32);
161 if (len < sl->ref_count[list])
162 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
166 if (lens[0] == lens[1] && lens[1] > 1) {
167 for (i = 0; i < lens[0] &&
168 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
169 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
171 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
175 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
176 h->short_ref, h->short_ref_count, 0, h->picture_structure);
177 len += build_def_list(sl->ref_list[0] + len,
178 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
179 h-> long_ref, 16, 1, h->picture_structure);
180 av_assert0(len <= 32);
182 if (len < sl->ref_count[0])
183 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
186 for (i = 0; i < sl->ref_count[0]; i++) {
187 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
188 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
189 sl->ref_list[0][i].pic_id,
190 sl->ref_list[0][i].data[0]);
192 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
193 for (i = 0; i < sl->ref_count[1]; i++) {
194 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
195 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
196 sl->ref_list[1][i].pic_id,
197 sl->ref_list[1][i].data[0]);
202 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
203 for (i = 0; i < sl->ref_count[j]; i++) {
204 if (sl->ref_list[j][i].parent) {
205 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
206 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
207 memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
212 for (i = 0; i < sl->list_count; i++)
213 h->default_ref[i] = sl->ref_list[i][0];
217 * print short term list
219 static void print_short_term(const H264Context *h)
222 if (h->avctx->debug & FF_DEBUG_MMCO) {
223 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
224 for (i = 0; i < h->short_ref_count; i++) {
225 H264Picture *pic = h->short_ref[i];
226 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
227 i, pic->frame_num, pic->poc, pic->f->data[0]);
233 * print long term list
235 static void print_long_term(const H264Context *h)
238 if (h->avctx->debug & FF_DEBUG_MMCO) {
239 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
240 for (i = 0; i < 16; i++) {
241 H264Picture *pic = h->long_ref[i];
243 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
244 i, pic->frame_num, pic->poc, pic->f->data[0]);
251 * Extract structure information about the picture described by pic_num in
252 * the current decoding context (frame or field). Note that pic_num is
253 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
254 * @param pic_num picture number for which to extract structure information
255 * @param structure one of PICT_XXX describing structure of picture
257 * @return frame number (short term) or long term index of picture
258 * described by pic_num
260 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
262 *structure = h->picture_structure;
263 if (FIELD_PICTURE(h)) {
266 *structure ^= PICT_FRAME;
273 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
276 for (list = 0; list < sl->list_count; list++) {
277 for (i = 0; i < sl->ref_count[list]; i++) {
278 H264Ref *frame = &sl->ref_list[list][i];
279 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
283 for (j = 0; j < 3; j++)
284 field[0].linesize[j] <<= 1;
285 field[0].reference = PICT_TOP_FIELD;
286 field[0].poc = field[0].parent->field_poc[0];
290 for (j = 0; j < 3; j++)
291 field[1].data[j] += frame->parent->f->linesize[j];
292 field[1].reference = PICT_BOTTOM_FIELD;
293 field[1].poc = field[1].parent->field_poc[1];
298 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
300 int list, index, pic_structure;
305 h264_initialise_ref_list(h, sl);
307 for (list = 0; list < sl->list_count; list++) {
308 int pred = h->curr_pic_num;
310 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
311 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
312 unsigned int val = sl->ref_modifications[list][index].val;
315 H264Picture *ref = NULL;
317 switch (modification_of_pic_nums_idc) {
320 const unsigned int abs_diff_pic_num = val + 1;
323 if (abs_diff_pic_num > h->max_pic_num) {
324 av_log(h->avctx, AV_LOG_ERROR,
325 "abs_diff_pic_num overflow\n");
326 return AVERROR_INVALIDDATA;
329 if (modification_of_pic_nums_idc == 0)
330 pred -= abs_diff_pic_num;
332 pred += abs_diff_pic_num;
333 pred &= h->max_pic_num - 1;
335 frame_num = pic_num_extract(h, pred, &pic_structure);
337 for (i = h->short_ref_count - 1; i >= 0; i--) {
338 ref = h->short_ref[i];
339 assert(ref->reference);
340 assert(!ref->long_ref);
341 if (ref->frame_num == frame_num &&
342 (ref->reference & pic_structure))
351 pic_id = val; // long_term_pic_idx
353 long_idx = pic_num_extract(h, pic_id, &pic_structure);
355 if (long_idx > 31U) {
356 av_log(h->avctx, AV_LOG_ERROR,
357 "long_term_pic_idx overflow\n");
358 return AVERROR_INVALIDDATA;
360 ref = h->long_ref[long_idx];
361 assert(!(ref && !ref->reference));
362 if (ref && (ref->reference & pic_structure)) {
363 ref->pic_id = pic_id;
364 assert(ref->long_ref);
376 av_log(h->avctx, AV_LOG_ERROR,
377 "reference picture missing during reorder\n");
378 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
380 for (i = index; i + 1 < sl->ref_count[list]; i++) {
381 if (sl->ref_list[list][i].parent &&
382 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
383 ref->pic_id == sl->ref_list[list][i].pic_id)
386 for (; i > index; i--) {
387 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
389 ref_from_h264pic(&sl->ref_list[list][index], ref);
390 if (FIELD_PICTURE(h)) {
391 pic_as_field(&sl->ref_list[list][index], pic_structure);
396 for (list = 0; list < sl->list_count; list++) {
397 for (index = 0; index < sl->ref_count[list]; index++) {
398 if ( !sl->ref_list[list][index].parent
399 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
401 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
402 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
403 h->last_pocs[i] = INT_MIN;
404 if (h->default_ref[list].parent
405 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
406 sl->ref_list[list][index] = h->default_ref[list];
410 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
415 h264_fill_mbaff_ref_list(sl);
420 int ff_h264_decode_ref_pic_list_reordering(const H264Context *h, H264SliceContext *sl)
424 sl->nb_ref_modifications[0] = 0;
425 sl->nb_ref_modifications[1] = 0;
427 for (list = 0; list < sl->list_count; list++) {
428 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
431 for (index = 0; ; index++) {
432 unsigned int op = get_ue_golomb_31(&sl->gb);
437 if (index >= sl->ref_count[list]) {
438 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
439 return AVERROR_INVALIDDATA;
441 av_log(h->avctx, AV_LOG_ERROR,
442 "illegal modification_of_pic_nums_idc %u\n",
444 return AVERROR_INVALIDDATA;
446 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
447 sl->ref_modifications[list][index].op = op;
448 sl->nb_ref_modifications[list]++;
456 * Mark a picture as no longer needed for reference. The refmask
457 * argument allows unreferencing of individual fields or the whole frame.
458 * If the picture becomes entirely unreferenced, but is being held for
459 * display purposes, it is marked as such.
460 * @param refmask mask of fields to unreference; the mask is bitwise
461 * anded with the reference marking of pic
462 * @return non-zero if pic becomes entirely unreferenced (except possibly
463 * for display purposes) zero if one of the fields remains in
466 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
469 if (pic->reference &= refmask) {
472 for(i = 0; h->delayed_pic[i]; i++)
473 if(pic == h->delayed_pic[i]){
474 pic->reference = DELAYED_PIC_REF;
482 * Find a H264Picture in the short term reference list by frame number.
483 * @param frame_num frame number to search for
484 * @param idx the index into h->short_ref where returned picture is found
485 * undefined if no picture found.
486 * @return pointer to the found picture, or NULL if no pic with the provided
487 * frame number is found
489 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
493 for (i = 0; i < h->short_ref_count; i++) {
494 H264Picture *pic = h->short_ref[i];
495 if (h->avctx->debug & FF_DEBUG_MMCO)
496 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
497 if (pic->frame_num == frame_num) {
506 * Remove a picture from the short term reference list by its index in
507 * that list. This does no checking on the provided index; it is assumed
508 * to be valid. Other list entries are shifted down.
509 * @param i index into h->short_ref of picture to remove.
511 static void remove_short_at_index(H264Context *h, int i)
513 assert(i >= 0 && i < h->short_ref_count);
514 h->short_ref[i] = NULL;
515 if (--h->short_ref_count)
516 memmove(&h->short_ref[i], &h->short_ref[i + 1],
517 (h->short_ref_count - i) * sizeof(H264Picture*));
521 * @return the removed picture or NULL if an error occurs
523 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
528 if (h->avctx->debug & FF_DEBUG_MMCO)
529 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
531 pic = find_short(h, frame_num, &i);
533 if (unreference_pic(h, pic, ref_mask))
534 remove_short_at_index(h, i);
541 * Remove a picture from the long term reference list by its index in
543 * @return the removed picture or NULL if an error occurs
545 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
549 pic = h->long_ref[i];
551 if (unreference_pic(h, pic, ref_mask)) {
552 assert(h->long_ref[i]->long_ref == 1);
553 h->long_ref[i]->long_ref = 0;
554 h->long_ref[i] = NULL;
562 void ff_h264_remove_all_refs(H264Context *h)
566 for (i = 0; i < 16; i++) {
567 remove_long(h, i, 0);
569 assert(h->long_ref_count == 0);
571 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
572 ff_h264_unref_picture(h, &h->last_pic_for_ec);
573 if (h->short_ref[0]->f->buf[0])
574 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
577 for (i = 0; i < h->short_ref_count; i++) {
578 unreference_pic(h, h->short_ref[i], 0);
579 h->short_ref[i] = NULL;
581 h->short_ref_count = 0;
583 memset(h->default_ref, 0, sizeof(h->default_ref));
584 for (i = 0; i < h->nb_slice_ctx; i++) {
585 H264SliceContext *sl = &h->slice_ctx[i];
586 sl->list_count = sl->ref_count[0] = sl->ref_count[1] = 0;
587 memset(sl->ref_list, 0, sizeof(sl->ref_list));
591 static void generate_sliding_window_mmcos(H264Context *h)
593 MMCO *mmco = h->mmco;
596 if (h->short_ref_count &&
597 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
598 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
599 mmco[0].opcode = MMCO_SHORT2UNUSED;
600 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
602 if (FIELD_PICTURE(h)) {
603 mmco[0].short_pic_num *= 2;
604 mmco[1].opcode = MMCO_SHORT2UNUSED;
605 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
610 h->nb_mmco = nb_mmco;
613 int ff_h264_execute_ref_pic_marking(H264Context *h)
615 MMCO *mmco = h->mmco;
618 int pps_ref_count[2] = {0};
619 int current_ref_assigned = 0, err = 0;
620 H264Picture *av_uninit(pic);
622 if (!h->explicit_ref_marking)
623 generate_sliding_window_mmcos(h);
624 mmco_count = h->nb_mmco;
626 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
627 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
629 for (i = 0; i < mmco_count; i++) {
630 int av_uninit(structure), av_uninit(frame_num);
631 if (h->avctx->debug & FF_DEBUG_MMCO)
632 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
633 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
635 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
636 mmco[i].opcode == MMCO_SHORT2LONG) {
637 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
638 pic = find_short(h, frame_num, &j);
640 if (mmco[i].opcode != MMCO_SHORT2LONG ||
641 !h->long_ref[mmco[i].long_arg] ||
642 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
643 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
644 err = AVERROR_INVALIDDATA;
650 switch (mmco[i].opcode) {
651 case MMCO_SHORT2UNUSED:
652 if (h->avctx->debug & FF_DEBUG_MMCO)
653 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
654 h->mmco[i].short_pic_num, h->short_ref_count);
655 remove_short(h, frame_num, structure ^ PICT_FRAME);
657 case MMCO_SHORT2LONG:
658 if (h->long_ref[mmco[i].long_arg] != pic)
659 remove_long(h, mmco[i].long_arg, 0);
661 remove_short_at_index(h, j);
662 h->long_ref[ mmco[i].long_arg ] = pic;
663 if (h->long_ref[mmco[i].long_arg]) {
664 h->long_ref[mmco[i].long_arg]->long_ref = 1;
668 case MMCO_LONG2UNUSED:
669 j = pic_num_extract(h, mmco[i].long_arg, &structure);
670 pic = h->long_ref[j];
672 remove_long(h, j, structure ^ PICT_FRAME);
673 } else if (h->avctx->debug & FF_DEBUG_MMCO)
674 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
677 // Comment below left from previous code as it is an interesting note.
678 /* First field in pair is in short term list or
679 * at a different long term index.
680 * This is not allowed; see 7.4.3.3, notes 2 and 3.
681 * Report the problem and keep the pair where it is,
682 * and mark this field valid.
684 if (h->short_ref[0] == h->cur_pic_ptr) {
685 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
686 remove_short_at_index(h, 0);
689 /* make sure the current picture is not already assigned as a long ref */
690 if (h->cur_pic_ptr->long_ref) {
691 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
692 if (h->long_ref[j] == h->cur_pic_ptr) {
693 if (j != mmco[i].long_arg)
694 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
695 remove_long(h, j, 0);
700 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
701 av_assert0(!h->cur_pic_ptr->long_ref);
702 remove_long(h, mmco[i].long_arg, 0);
704 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
705 h->long_ref[mmco[i].long_arg]->long_ref = 1;
709 h->cur_pic_ptr->reference |= h->picture_structure;
710 current_ref_assigned = 1;
712 case MMCO_SET_MAX_LONG:
713 assert(mmco[i].long_arg <= 16);
714 // just remove the long term which index is greater than new max
715 for (j = mmco[i].long_arg; j < 16; j++) {
716 remove_long(h, j, 0);
720 while (h->short_ref_count) {
721 remove_short(h, h->short_ref[0]->frame_num, 0);
723 for (j = 0; j < 16; j++) {
724 remove_long(h, j, 0);
726 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
728 h->cur_pic_ptr->mmco_reset = 1;
729 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
730 h->last_pocs[j] = INT_MIN;
736 if (!current_ref_assigned) {
737 /* Second field of complementary field pair; the first field of
738 * which is already referenced. If short referenced, it
739 * should be first entry in short_ref. If not, it must exist
740 * in long_ref; trying to put it on the short list here is an
741 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
743 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
744 /* Just mark the second field valid */
745 h->cur_pic_ptr->reference |= h->picture_structure;
746 } else if (h->cur_pic_ptr->long_ref) {
747 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
748 "assignment for second field "
749 "in complementary field pair "
750 "(first field is long term)\n");
751 err = AVERROR_INVALIDDATA;
753 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
755 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
756 err = AVERROR_INVALIDDATA;
759 if (h->short_ref_count)
760 memmove(&h->short_ref[1], &h->short_ref[0],
761 h->short_ref_count * sizeof(H264Picture*));
763 h->short_ref[0] = h->cur_pic_ptr;
764 h->short_ref_count++;
765 h->cur_pic_ptr->reference |= h->picture_structure;
769 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
771 /* We have too many reference frames, probably due to corrupted
772 * stream. Need to discard one frame. Prevents overrun of the
773 * short_ref and long_ref buffers.
775 av_log(h->avctx, AV_LOG_ERROR,
776 "number of reference frames (%d+%d) exceeds max (%d; probably "
777 "corrupt input), discarding one\n",
778 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
779 err = AVERROR_INVALIDDATA;
781 if (h->long_ref_count && !h->short_ref_count) {
782 for (i = 0; i < 16; ++i)
787 remove_long(h, i, 0);
789 pic = h->short_ref[h->short_ref_count - 1];
790 remove_short(h, pic->frame_num, 0);
794 for (i = 0; i<h->short_ref_count; i++) {
795 pic = h->short_ref[i];
796 if (pic->invalid_gap) {
797 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
798 if (d > h->ps.sps->ref_frame_count)
799 remove_short(h, pic->frame_num, 0);
806 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
807 if (h->ps.pps_list[i]) {
808 const PPS *pps = (const PPS *)h->ps.pps_list[i]->data;
809 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
810 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
815 && h->long_ref_count==0
816 && ( h->short_ref_count<=2
817 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
818 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
819 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
820 h->cur_pic_ptr->recovered |= 1;
821 if(!h->avctx->has_b_frames)
822 h->frame_recovered |= FRAME_RECOVERED_SEI;
825 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
828 int ff_h264_decode_ref_pic_marking(const H264Context *h, H264SliceContext *sl,
832 MMCO *mmco = sl->mmco;
835 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
836 skip_bits1(gb); // broken_link
838 mmco[0].opcode = MMCO_LONG;
839 mmco[0].long_arg = 0;
842 sl->explicit_ref_marking = 1;
844 sl->explicit_ref_marking = get_bits1(gb);
845 if (sl->explicit_ref_marking) {
846 for (i = 0; i < MAX_MMCO_COUNT; i++) {
847 MMCOOpcode opcode = get_ue_golomb_31(gb);
849 mmco[i].opcode = opcode;
850 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
851 mmco[i].short_pic_num =
852 (h->curr_pic_num - get_ue_golomb_long(gb) - 1) &
853 (h->max_pic_num - 1);
855 if (mmco[i].short_pic_num >= h->short_ref_count ||
856 !h->short_ref[mmco[i].short_pic_num]) {
857 av_log(s->avctx, AV_LOG_ERROR,
858 "illegal short ref in memory management control "
859 "operation %d\n", mmco);
864 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
865 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
866 unsigned int long_arg = get_ue_golomb_31(gb);
867 if (long_arg >= 32 ||
868 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
870 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
871 av_log(h->avctx, AV_LOG_ERROR,
872 "illegal long ref in memory management control "
873 "operation %d\n", opcode);
876 mmco[i].long_arg = long_arg;
879 if (opcode > (unsigned) MMCO_LONG) {
880 av_log(h->avctx, AV_LOG_ERROR,
881 "illegal memory management control operation %d\n",
885 if (opcode == MMCO_END)
892 sl->nb_mmco = nb_mmco;