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>
28 #include "libavutil/avassert.h"
36 #define COPY_PICTURE(dst, src) \
39 (dst)->f.extended_data = (dst)->f.data;\
40 (dst)->tf.f = &(dst)->f;\
44 static void pic_as_field(Picture *pic, const int parity){
46 for (i = 0; i < 4; ++i) {
47 if (parity == PICT_BOTTOM_FIELD)
48 pic->f.data[i] += pic->f.linesize[i];
49 pic->reference = parity;
50 pic->f.linesize[i] *= 2;
52 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
55 static int split_field_copy(Picture *dest, Picture *src, int parity, int id_add)
57 int match = !!(src->reference & parity);
60 COPY_PICTURE(dest, src);
61 if (parity != PICT_FRAME) {
62 pic_as_field(dest, parity);
64 dest->pic_id += id_add;
71 static int build_def_list(Picture *def, int def_len,
72 Picture **in, int len, int is_long, int sel)
77 while (i[0] < len || i[1] < len) {
78 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
80 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
83 av_assert0(index < def_len);
84 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
85 split_field_copy(&def[index++], in[i[0]++], sel, 1);
88 av_assert0(index < def_len);
89 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
90 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
97 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir)
103 best_poc = dir ? INT_MIN : INT_MAX;
105 for (i = 0; i < len; i++) {
106 const int poc = src[i]->poc;
107 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
109 sorted[out_i] = src[i];
112 if (best_poc == (dir ? INT_MIN : INT_MAX))
114 limit = sorted[out_i++]->poc - dir;
119 int ff_h264_fill_default_ref_list(H264Context *h)
123 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
128 if (FIELD_PICTURE(h))
129 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
131 cur_poc = h->cur_pic_ptr->poc;
133 for (list = 0; list < 2; list++) {
134 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
135 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
136 av_assert0(len <= 32);
138 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]),
139 sorted, len, 0, h->picture_structure);
140 len += build_def_list(h->default_ref_list[list] + len,
141 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
142 h->long_ref, 16, 1, h->picture_structure);
143 av_assert0(len <= 32);
145 if (len < h->ref_count[list])
146 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
150 if (lens[0] == lens[1] && lens[1] > 1) {
151 for (i = 0; i < lens[0] &&
152 h->default_ref_list[0][i].f.buf[0]->buffer ==
153 h->default_ref_list[1][i].f.buf[0]->buffer; i++);
156 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
157 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
158 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
162 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]),
163 h->short_ref, h->short_ref_count, 0, h->picture_structure);
164 len += build_def_list(h->default_ref_list[0] + len,
165 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
166 h-> long_ref, 16, 1, h->picture_structure);
167 av_assert0(len <= 32);
169 if (len < h->ref_count[0])
170 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
173 for (i = 0; i < h->ref_count[0]; i++) {
174 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
175 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
176 h->default_ref_list[0][i].pic_id,
177 h->default_ref_list[0][i].f.data[0]);
179 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
180 for (i = 0; i < h->ref_count[1]; i++) {
181 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
182 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
183 h->default_ref_list[1][i].pic_id,
184 h->default_ref_list[1][i].f.data[0]);
191 static void print_short_term(H264Context *h);
192 static void print_long_term(H264Context *h);
195 * Extract structure information about the picture described by pic_num in
196 * the current decoding context (frame or field). Note that pic_num is
197 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
198 * @param pic_num picture number for which to extract structure information
199 * @param structure one of PICT_XXX describing structure of picture
201 * @return frame number (short term) or long term index of picture
202 * described by pic_num
204 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
206 *structure = h->picture_structure;
207 if (FIELD_PICTURE(h)) {
210 *structure ^= PICT_FRAME;
217 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
219 int list, index, pic_structure, i;
224 for (list = 0; list < h->list_count; list++) {
225 for (i = 0; i < h->ref_count[list]; i++)
226 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
228 if (get_bits1(&h->gb)) { // ref_pic_list_modification_flag_l[01]
229 int pred = h->curr_pic_num;
231 for (index = 0; ; index++) {
232 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
237 if (modification_of_pic_nums_idc == 3)
240 if (index >= h->ref_count[list]) {
241 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
245 switch (modification_of_pic_nums_idc) {
248 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
251 if (abs_diff_pic_num > h->max_pic_num) {
252 av_log(h->avctx, AV_LOG_ERROR,
253 "abs_diff_pic_num overflow\n");
254 return AVERROR_INVALIDDATA;
257 if (modification_of_pic_nums_idc == 0)
258 pred -= abs_diff_pic_num;
260 pred += abs_diff_pic_num;
261 pred &= h->max_pic_num - 1;
263 frame_num = pic_num_extract(h, pred, &pic_structure);
265 for (i = h->short_ref_count - 1; i >= 0; i--) {
266 ref = h->short_ref[i];
267 assert(ref->reference);
268 assert(!ref->long_ref);
269 if (ref->frame_num == frame_num &&
270 (ref->reference & pic_structure))
279 pic_id = get_ue_golomb(&h->gb); // long_term_pic_idx
281 long_idx = pic_num_extract(h, pic_id, &pic_structure);
284 av_log(h->avctx, AV_LOG_ERROR,
285 "long_term_pic_idx overflow\n");
286 return AVERROR_INVALIDDATA;
288 ref = h->long_ref[long_idx];
289 assert(!(ref && !ref->reference));
290 if (ref && (ref->reference & pic_structure)) {
291 ref->pic_id = pic_id;
292 assert(ref->long_ref);
300 av_log(h->avctx, AV_LOG_ERROR,
301 "illegal modification_of_pic_nums_idc %u\n",
302 modification_of_pic_nums_idc);
303 return AVERROR_INVALIDDATA;
307 av_log(h->avctx, AV_LOG_ERROR,
308 "reference picture missing during reorder\n");
309 memset(&h->ref_list[list][index], 0, sizeof(Picture)); // FIXME
311 for (i = index; i + 1 < h->ref_count[list]; i++) {
312 if (ref->long_ref == h->ref_list[list][i].long_ref &&
313 ref->pic_id == h->ref_list[list][i].pic_id)
316 for (; i > index; i--) {
317 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
319 COPY_PICTURE(&h->ref_list[list][index], ref);
320 if (FIELD_PICTURE(h)) {
321 pic_as_field(&h->ref_list[list][index], pic_structure);
327 for (list = 0; list < h->list_count; list++) {
328 for (index = 0; index < h->ref_count[list]; index++) {
329 if ( !h->ref_list[list][index].f.buf[0]
330 || (!FIELD_PICTURE(h) && (h->ref_list[list][index].reference&3) != 3)) {
332 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
333 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
334 h->last_pocs[i] = INT_MIN;
335 if (h->default_ref_list[list][0].f.buf[0]
336 && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3))
337 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
341 av_assert0(av_buffer_get_ref_count(h->ref_list[list][index].f.buf[0]) > 0);
348 void ff_h264_fill_mbaff_ref_list(H264Context *h)
351 for (list = 0; list < h->list_count; list++) {
352 for (i = 0; i < h->ref_count[list]; i++) {
353 Picture *frame = &h->ref_list[list][i];
354 Picture *field = &h->ref_list[list][16 + 2 * i];
355 COPY_PICTURE(field, frame);
356 for (j = 0; j < 3; j++)
357 field[0].f.linesize[j] <<= 1;
358 field[0].reference = PICT_TOP_FIELD;
359 field[0].poc = field[0].field_poc[0];
360 COPY_PICTURE(field + 1, field);
361 for (j = 0; j < 3; j++)
362 field[1].f.data[j] += frame->f.linesize[j];
363 field[1].reference = PICT_BOTTOM_FIELD;
364 field[1].poc = field[1].field_poc[1];
366 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
367 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
368 for (j = 0; j < 2; j++) {
369 h->chroma_weight[16 + 2 * i][list][j][0] = h->chroma_weight[16 + 2 * i + 1][list][j][0] = h->chroma_weight[i][list][j][0];
370 h->chroma_weight[16 + 2 * i][list][j][1] = h->chroma_weight[16 + 2 * i + 1][list][j][1] = h->chroma_weight[i][list][j][1];
377 * Mark a picture as no longer needed for reference. The refmask
378 * argument allows unreferencing of individual fields or the whole frame.
379 * If the picture becomes entirely unreferenced, but is being held for
380 * display purposes, it is marked as such.
381 * @param refmask mask of fields to unreference; the mask is bitwise
382 * anded with the reference marking of pic
383 * @return non-zero if pic becomes entirely unreferenced (except possibly
384 * for display purposes) zero if one of the fields remains in
387 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
390 if (pic->reference &= refmask) {
393 for(i = 0; h->delayed_pic[i]; i++)
394 if(pic == h->delayed_pic[i]){
395 pic->reference = DELAYED_PIC_REF;
403 * Find a Picture in the short term reference list by frame number.
404 * @param frame_num frame number to search for
405 * @param idx the index into h->short_ref where returned picture is found
406 * undefined if no picture found.
407 * @return pointer to the found picture, or NULL if no pic with the provided
408 * frame number is found
410 static Picture *find_short(H264Context *h, int frame_num, int *idx)
414 for (i = 0; i < h->short_ref_count; i++) {
415 Picture *pic = h->short_ref[i];
416 if (h->avctx->debug & FF_DEBUG_MMCO)
417 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
418 if (pic->frame_num == frame_num) {
427 * Remove a picture from the short term reference list by its index in
428 * that list. This does no checking on the provided index; it is assumed
429 * to be valid. Other list entries are shifted down.
430 * @param i index into h->short_ref of picture to remove.
432 static void remove_short_at_index(H264Context *h, int i)
434 assert(i >= 0 && i < h->short_ref_count);
435 h->short_ref[i] = NULL;
436 if (--h->short_ref_count)
437 memmove(&h->short_ref[i], &h->short_ref[i + 1],
438 (h->short_ref_count - i) * sizeof(Picture*));
443 * @return the removed picture or NULL if an error occurs
445 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
450 if (h->avctx->debug & FF_DEBUG_MMCO)
451 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
453 pic = find_short(h, frame_num, &i);
455 if (unreference_pic(h, pic, ref_mask))
456 remove_short_at_index(h, i);
463 * Remove a picture from the long term reference list by its index in
465 * @return the removed picture or NULL if an error occurs
467 static Picture *remove_long(H264Context *h, int i, int ref_mask)
471 pic = h->long_ref[i];
473 if (unreference_pic(h, pic, ref_mask)) {
474 assert(h->long_ref[i]->long_ref == 1);
475 h->long_ref[i]->long_ref = 0;
476 h->long_ref[i] = NULL;
484 void ff_h264_remove_all_refs(H264Context *h)
488 for (i = 0; i < 16; i++) {
489 remove_long(h, i, 0);
491 assert(h->long_ref_count == 0);
493 for (i = 0; i < h->short_ref_count; i++) {
494 unreference_pic(h, h->short_ref[i], 0);
495 h->short_ref[i] = NULL;
497 h->short_ref_count = 0;
499 memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
500 memset(h->ref_list, 0, sizeof(h->ref_list));
504 * print short term list
506 static void print_short_term(H264Context *h)
509 if (h->avctx->debug & FF_DEBUG_MMCO) {
510 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
511 for (i = 0; i < h->short_ref_count; i++) {
512 Picture *pic = h->short_ref[i];
513 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
514 i, pic->frame_num, pic->poc, pic->f.data[0]);
520 * print long term list
522 static void print_long_term(H264Context *h)
525 if (h->avctx->debug & FF_DEBUG_MMCO) {
526 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
527 for (i = 0; i < 16; i++) {
528 Picture *pic = h->long_ref[i];
530 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
531 i, pic->frame_num, pic->poc, pic->f.data[0]);
537 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
541 for (i = 0; i < n_mmcos; i++) {
542 if (mmco1[i].opcode != mmco2[i].opcode) {
543 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
544 mmco1[i].opcode, mmco2[i].opcode, i);
552 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
554 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
555 int mmco_index = 0, i = 0;
557 if (h->short_ref_count &&
558 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
559 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
560 mmco[0].opcode = MMCO_SHORT2UNUSED;
561 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
563 if (FIELD_PICTURE(h)) {
564 mmco[0].short_pic_num *= 2;
565 mmco[1].opcode = MMCO_SHORT2UNUSED;
566 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
572 h->mmco_index = mmco_index;
573 } else if (!first_slice && mmco_index >= 0 &&
574 (mmco_index != h->mmco_index ||
575 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
576 av_log(h->avctx, AV_LOG_ERROR,
577 "Inconsistent MMCO state between slices [%d, %d]\n",
578 mmco_index, h->mmco_index);
579 return AVERROR_INVALIDDATA;
584 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
588 int current_ref_assigned = 0, err = 0;
589 Picture *av_uninit(pic);
591 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
592 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
594 for (i = 0; i < mmco_count; i++) {
595 int av_uninit(structure), av_uninit(frame_num);
596 if (h->avctx->debug & FF_DEBUG_MMCO)
597 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
598 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
600 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
601 mmco[i].opcode == MMCO_SHORT2LONG) {
602 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
603 pic = find_short(h, frame_num, &j);
605 if (mmco[i].opcode != MMCO_SHORT2LONG ||
606 !h->long_ref[mmco[i].long_arg] ||
607 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
608 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
609 err = AVERROR_INVALIDDATA;
615 switch (mmco[i].opcode) {
616 case MMCO_SHORT2UNUSED:
617 if (h->avctx->debug & FF_DEBUG_MMCO)
618 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
619 h->mmco[i].short_pic_num, h->short_ref_count);
620 remove_short(h, frame_num, structure ^ PICT_FRAME);
622 case MMCO_SHORT2LONG:
623 if (h->long_ref[mmco[i].long_arg] != pic)
624 remove_long(h, mmco[i].long_arg, 0);
626 remove_short_at_index(h, j);
627 h->long_ref[ mmco[i].long_arg ] = pic;
628 if (h->long_ref[mmco[i].long_arg]) {
629 h->long_ref[mmco[i].long_arg]->long_ref = 1;
633 case MMCO_LONG2UNUSED:
634 j = pic_num_extract(h, mmco[i].long_arg, &structure);
635 pic = h->long_ref[j];
637 remove_long(h, j, structure ^ PICT_FRAME);
638 } else if (h->avctx->debug & FF_DEBUG_MMCO)
639 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
642 // Comment below left from previous code as it is an interresting note.
643 /* First field in pair is in short term list or
644 * at a different long term index.
645 * This is not allowed; see 7.4.3.3, notes 2 and 3.
646 * Report the problem and keep the pair where it is,
647 * and mark this field valid.
649 if (h->short_ref[0] == h->cur_pic_ptr) {
650 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
651 remove_short_at_index(h, 0);
654 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
655 if (h->cur_pic_ptr->long_ref) {
656 for(j=0; j<16; j++) {
657 if(h->long_ref[j] == h->cur_pic_ptr) {
658 remove_long(h, j, 0);
659 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
663 av_assert0(!h->cur_pic_ptr->long_ref);
664 remove_long(h, mmco[i].long_arg, 0);
666 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
667 h->long_ref[mmco[i].long_arg]->long_ref = 1;
671 h->cur_pic_ptr->reference |= h->picture_structure;
672 current_ref_assigned = 1;
674 case MMCO_SET_MAX_LONG:
675 assert(mmco[i].long_arg <= 16);
676 // just remove the long term which index is greater than new max
677 for (j = mmco[i].long_arg; j < 16; j++) {
678 remove_long(h, j, 0);
682 while (h->short_ref_count) {
683 remove_short(h, h->short_ref[0]->frame_num, 0);
685 for (j = 0; j < 16; j++) {
686 remove_long(h, j, 0);
688 h->frame_num = h->cur_pic_ptr->frame_num = 0;
690 h->cur_pic_ptr->mmco_reset = 1;
691 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
692 h->last_pocs[j] = INT_MIN;
698 if (!current_ref_assigned) {
699 /* Second field of complementary field pair; the first field of
700 * which is already referenced. If short referenced, it
701 * should be first entry in short_ref. If not, it must exist
702 * in long_ref; trying to put it on the short list here is an
703 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
705 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
706 /* Just mark the second field valid */
707 h->cur_pic_ptr->reference = PICT_FRAME;
708 } else if (h->cur_pic_ptr->long_ref) {
709 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
710 "assignment for second field "
711 "in complementary field pair "
712 "(first field is long term)\n");
713 err = AVERROR_INVALIDDATA;
715 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
717 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
718 err = AVERROR_INVALIDDATA;
721 if (h->short_ref_count)
722 memmove(&h->short_ref[1], &h->short_ref[0],
723 h->short_ref_count * sizeof(Picture*));
725 h->short_ref[0] = h->cur_pic_ptr;
726 h->short_ref_count++;
727 h->cur_pic_ptr->reference |= h->picture_structure;
731 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
733 /* We have too many reference frames, probably due to corrupted
734 * stream. Need to discard one frame. Prevents overrun of the
735 * short_ref and long_ref buffers.
737 av_log(h->avctx, AV_LOG_ERROR,
738 "number of reference frames (%d+%d) exceeds max (%d; probably "
739 "corrupt input), discarding one\n",
740 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
741 err = AVERROR_INVALIDDATA;
743 if (h->long_ref_count && !h->short_ref_count) {
744 for (i = 0; i < 16; ++i)
749 remove_long(h, i, 0);
751 pic = h->short_ref[h->short_ref_count - 1];
752 remove_short(h, pic->frame_num, 0);
756 for (i = 0; i<h->short_ref_count; i++) {
757 pic = h->short_ref[i];
758 if (pic->invalid_gap) {
759 int d = (h->cur_pic_ptr->frame_num - pic->frame_num) & ((1 << h->sps.log2_max_frame_num)-1);
760 if (d > h->sps.ref_frame_count)
761 remove_short(h, pic->frame_num, 0);
769 for (i = 0; i < FF_ARRAY_ELEMS(h->pps_buffers); i++)
770 pps_count += !!h->pps_buffers[i];
773 && h->long_ref_count==0
774 && (h->short_ref_count<=2 || h->pps.ref_count[0] <= 1 && h->pps.ref_count[1] <= 1 && pps_count == 1)
775 && h->pps.ref_count[0]<=2 + (h->picture_structure != PICT_FRAME)
776 && h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){
777 h->cur_pic_ptr->recovered |= 1;
778 if(!h->avctx->has_b_frames)
779 h->frame_recovered |= FRAME_RECOVERED_SEI;
782 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
785 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
789 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
792 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
793 skip_bits1(gb); // broken_link
795 mmco[0].opcode = MMCO_LONG;
796 mmco[0].long_arg = 0;
800 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
801 for (i = 0; i < MAX_MMCO_COUNT; i++) {
802 MMCOOpcode opcode = get_ue_golomb_31(gb);
804 mmco[i].opcode = opcode;
805 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
806 mmco[i].short_pic_num =
807 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
808 (h->max_pic_num - 1);
810 if (mmco[i].short_pic_num >= h->short_ref_count ||
811 h->short_ref[ mmco[i].short_pic_num ] == NULL){
812 av_log(s->avctx, AV_LOG_ERROR,
813 "illegal short ref in memory management control "
814 "operation %d\n", mmco);
819 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
820 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
821 unsigned int long_arg = get_ue_golomb_31(gb);
822 if (long_arg >= 32 ||
823 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
825 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
826 av_log(h->avctx, AV_LOG_ERROR,
827 "illegal long ref in memory management control "
828 "operation %d\n", opcode);
831 mmco[i].long_arg = long_arg;
834 if (opcode > (unsigned) MMCO_LONG) {
835 av_log(h->avctx, AV_LOG_ERROR,
836 "illegal memory management control operation %d\n",
840 if (opcode == MMCO_END)
846 ret = ff_generate_sliding_window_mmcos(h, first_slice);
847 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
854 if (first_slice && mmco_index != -1) {
855 memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
856 h->mmco_index = mmco_index;
857 } else if (!first_slice && mmco_index >= 0 &&
858 (mmco_index != h->mmco_index ||
859 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
860 av_log(h->avctx, AV_LOG_ERROR,
861 "Inconsistent MMCO state between slices [%d, %d]\n",
862 mmco_index, h->mmco_index);
863 return AVERROR_INVALIDDATA;