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, Picture **in, int len, int is_long, int sel)
76 while (i[0] < len || i[1] < len) {
77 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
79 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
82 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
83 split_field_copy(&def[index++], in[i[0]++], sel, 1);
86 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
87 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
94 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir)
100 best_poc = dir ? INT_MIN : INT_MAX;
102 for (i = 0; i < len; i++) {
103 const int poc = src[i]->poc;
104 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
106 sorted[out_i] = src[i];
109 if (best_poc == (dir ? INT_MIN : INT_MAX))
111 limit = sorted[out_i++]->poc - dir;
116 int ff_h264_fill_default_ref_list(H264Context *h)
120 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
125 if (FIELD_PICTURE(h))
126 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
128 cur_poc = h->cur_pic_ptr->poc;
130 for (list = 0; list < 2; list++) {
131 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
132 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
133 av_assert0(len <= 32);
134 len = build_def_list(h->default_ref_list[list], sorted, len, 0, h->picture_structure);
135 len += build_def_list(h->default_ref_list[list] + len, h->long_ref, 16, 1, h->picture_structure);
136 av_assert0(len <= 32);
138 if (len < h->ref_count[list])
139 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
143 if (lens[0] == lens[1] && lens[1] > 1) {
144 for (i = 0; i < lens[0] &&
145 h->default_ref_list[0][i].f.buf[0]->buffer ==
146 h->default_ref_list[1][i].f.buf[0]->buffer; i++);
149 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
150 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
151 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
155 len = build_def_list(h->default_ref_list[0], h->short_ref, h->short_ref_count, 0, h->picture_structure);
156 len += build_def_list(h->default_ref_list[0] + len, h-> long_ref, 16, 1, h->picture_structure);
157 av_assert0(len <= 32);
158 if (len < h->ref_count[0])
159 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
162 for (i = 0; i < h->ref_count[0]; i++) {
163 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
164 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
165 h->default_ref_list[0][i].pic_id,
166 h->default_ref_list[0][i].f.data[0]);
168 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
169 for (i = 0; i < h->ref_count[1]; i++) {
170 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
171 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
172 h->default_ref_list[1][i].pic_id,
173 h->default_ref_list[1][i].f.data[0]);
180 static void print_short_term(H264Context *h);
181 static void print_long_term(H264Context *h);
184 * Extract structure information about the picture described by pic_num in
185 * the current decoding context (frame or field). Note that pic_num is
186 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
187 * @param pic_num picture number for which to extract structure information
188 * @param structure one of PICT_XXX describing structure of picture
190 * @return frame number (short term) or long term index of picture
191 * described by pic_num
193 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
195 *structure = h->picture_structure;
196 if (FIELD_PICTURE(h)) {
199 *structure ^= PICT_FRAME;
206 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
208 int list, index, pic_structure, i;
213 for (list = 0; list < h->list_count; list++) {
214 for (i = 0; i < h->ref_count[list]; i++)
215 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
217 if (get_bits1(&h->gb)) {
218 int pred = h->curr_pic_num;
220 for (index = 0; ; index++) {
221 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
226 if (reordering_of_pic_nums_idc == 3)
229 if (index >= h->ref_count[list]) {
230 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
234 if (reordering_of_pic_nums_idc < 3) {
235 if (reordering_of_pic_nums_idc < 2) {
236 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
239 if (abs_diff_pic_num > h->max_pic_num) {
240 av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
244 if (reordering_of_pic_nums_idc == 0)
245 pred -= abs_diff_pic_num;
247 pred += abs_diff_pic_num;
248 pred &= h->max_pic_num - 1;
250 frame_num = pic_num_extract(h, pred, &pic_structure);
252 for (i = h->short_ref_count - 1; i >= 0; i--) {
253 ref = h->short_ref[i];
254 assert(ref->reference);
255 assert(!ref->long_ref);
256 if (ref->frame_num == frame_num &&
257 (ref->reference & pic_structure))
264 pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx
266 long_idx = pic_num_extract(h, pic_id, &pic_structure);
269 av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
272 ref = h->long_ref[long_idx];
273 assert(!(ref && !ref->reference));
274 if (ref && (ref->reference & pic_structure)) {
275 ref->pic_id = pic_id;
276 assert(ref->long_ref);
284 av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
285 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
287 for (i = index; i + 1 < h->ref_count[list]; i++) {
288 if (ref->long_ref == h->ref_list[list][i].long_ref &&
289 ref->pic_id == h->ref_list[list][i].pic_id)
292 for (; i > index; i--) {
293 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
295 COPY_PICTURE(&h->ref_list[list][index], ref);
296 if (FIELD_PICTURE(h)) {
297 pic_as_field(&h->ref_list[list][index], pic_structure);
301 av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
307 for (list = 0; list < h->list_count; list++) {
308 for (index = 0; index < h->ref_count[list]; index++) {
309 if ( !h->ref_list[list][index].f.buf[0]
310 || (!FIELD_PICTURE(h) && (h->ref_list[list][index].reference&3) != 3)) {
312 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
313 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
314 h->last_pocs[i] = INT_MIN;
315 if (h->default_ref_list[list][0].f.buf[0]
316 && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3))
317 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
321 av_assert0(av_buffer_get_ref_count(h->ref_list[list][index].f.buf[0]) > 0);
328 void ff_h264_fill_mbaff_ref_list(H264Context *h)
331 for (list = 0; list < h->list_count; list++) {
332 for (i = 0; i < h->ref_count[list]; i++) {
333 Picture *frame = &h->ref_list[list][i];
334 Picture *field = &h->ref_list[list][16 + 2 * i];
335 COPY_PICTURE(field, frame);
336 for (j = 0; j < 3; j++)
337 field[0].f.linesize[j] <<= 1;
338 field[0].reference = PICT_TOP_FIELD;
339 field[0].poc = field[0].field_poc[0];
340 COPY_PICTURE(field + 1, field);
341 for (j = 0; j < 3; j++)
342 field[1].f.data[j] += frame->f.linesize[j];
343 field[1].reference = PICT_BOTTOM_FIELD;
344 field[1].poc = field[1].field_poc[1];
346 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
347 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
348 for (j = 0; j < 2; j++) {
349 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];
350 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];
357 * Mark a picture as no longer needed for reference. The refmask
358 * argument allows unreferencing of individual fields or the whole frame.
359 * If the picture becomes entirely unreferenced, but is being held for
360 * display purposes, it is marked as such.
361 * @param refmask mask of fields to unreference; the mask is bitwise
362 * anded with the reference marking of pic
363 * @return non-zero if pic becomes entirely unreferenced (except possibly
364 * for display purposes) zero if one of the fields remains in
367 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
370 if (pic->reference &= refmask) {
373 for(i = 0; h->delayed_pic[i]; i++)
374 if(pic == h->delayed_pic[i]){
375 pic->reference = DELAYED_PIC_REF;
383 * Find a Picture in the short term reference list by frame number.
384 * @param frame_num frame number to search for
385 * @param idx the index into h->short_ref where returned picture is found
386 * undefined if no picture found.
387 * @return pointer to the found picture, or NULL if no pic with the provided
388 * frame number is found
390 static Picture *find_short(H264Context *h, int frame_num, int *idx)
394 for (i = 0; i < h->short_ref_count; i++) {
395 Picture *pic = h->short_ref[i];
396 if (h->avctx->debug & FF_DEBUG_MMCO)
397 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
398 if (pic->frame_num == frame_num) {
407 * Remove a picture from the short term reference list by its index in
408 * that list. This does no checking on the provided index; it is assumed
409 * to be valid. Other list entries are shifted down.
410 * @param i index into h->short_ref of picture to remove.
412 static void remove_short_at_index(H264Context *h, int i)
414 assert(i >= 0 && i < h->short_ref_count);
415 h->short_ref[i] = NULL;
416 if (--h->short_ref_count)
417 memmove(&h->short_ref[i], &h->short_ref[i + 1],
418 (h->short_ref_count - i) * sizeof(Picture*));
423 * @return the removed picture or NULL if an error occurs
425 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
430 if (h->avctx->debug & FF_DEBUG_MMCO)
431 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
433 pic = find_short(h, frame_num, &i);
435 if (unreference_pic(h, pic, ref_mask))
436 remove_short_at_index(h, i);
443 * Remove a picture from the long term reference list by its index in
445 * @return the removed picture or NULL if an error occurs
447 static Picture *remove_long(H264Context *h, int i, int ref_mask)
451 pic = h->long_ref[i];
453 if (unreference_pic(h, pic, ref_mask)) {
454 assert(h->long_ref[i]->long_ref == 1);
455 h->long_ref[i]->long_ref = 0;
456 h->long_ref[i] = NULL;
464 void ff_h264_remove_all_refs(H264Context *h)
468 for (i = 0; i < 16; i++) {
469 remove_long(h, i, 0);
471 assert(h->long_ref_count == 0);
473 for (i = 0; i < h->short_ref_count; i++) {
474 unreference_pic(h, h->short_ref[i], 0);
475 h->short_ref[i] = NULL;
477 h->short_ref_count = 0;
479 memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
480 memset(h->ref_list, 0, sizeof(h->ref_list));
484 * print short term list
486 static void print_short_term(H264Context *h)
489 if (h->avctx->debug & FF_DEBUG_MMCO) {
490 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
491 for (i = 0; i < h->short_ref_count; i++) {
492 Picture *pic = h->short_ref[i];
493 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
494 i, pic->frame_num, pic->poc, pic->f.data[0]);
500 * print long term list
502 static void print_long_term(H264Context *h)
505 if (h->avctx->debug & FF_DEBUG_MMCO) {
506 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
507 for (i = 0; i < 16; i++) {
508 Picture *pic = h->long_ref[i];
510 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
511 i, pic->frame_num, pic->poc, pic->f.data[0]);
517 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
521 for (i = 0; i < n_mmcos; i++) {
522 if (mmco1[i].opcode != mmco2[i].opcode) {
523 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
524 mmco1[i].opcode, mmco2[i].opcode, i);
532 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
534 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
535 int mmco_index = 0, i;
537 if (h->short_ref_count &&
538 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
539 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
540 mmco[0].opcode = MMCO_SHORT2UNUSED;
541 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
543 if (FIELD_PICTURE(h)) {
544 mmco[0].short_pic_num *= 2;
545 mmco[1].opcode = MMCO_SHORT2UNUSED;
546 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
552 h->mmco_index = mmco_index;
553 } else if (!first_slice && mmco_index >= 0 &&
554 (mmco_index != h->mmco_index ||
555 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
556 av_log(h->avctx, AV_LOG_ERROR,
557 "Inconsistent MMCO state between slices [%d, %d]\n",
558 mmco_index, h->mmco_index);
559 return AVERROR_INVALIDDATA;
564 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
567 int current_ref_assigned = 0, err = 0;
568 Picture *av_uninit(pic);
570 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
571 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
573 for (i = 0; i < mmco_count; i++) {
574 int av_uninit(structure), av_uninit(frame_num);
575 if (h->avctx->debug & FF_DEBUG_MMCO)
576 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
577 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
579 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
580 mmco[i].opcode == MMCO_SHORT2LONG) {
581 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
582 pic = find_short(h, frame_num, &j);
584 if (mmco[i].opcode != MMCO_SHORT2LONG ||
585 !h->long_ref[mmco[i].long_arg] ||
586 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
587 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
588 err = AVERROR_INVALIDDATA;
594 switch (mmco[i].opcode) {
595 case MMCO_SHORT2UNUSED:
596 if (h->avctx->debug & FF_DEBUG_MMCO)
597 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
598 h->mmco[i].short_pic_num, h->short_ref_count);
599 remove_short(h, frame_num, structure ^ PICT_FRAME);
601 case MMCO_SHORT2LONG:
602 if (h->long_ref[mmco[i].long_arg] != pic)
603 remove_long(h, mmco[i].long_arg, 0);
605 remove_short_at_index(h, j);
606 h->long_ref[ mmco[i].long_arg ] = pic;
607 if (h->long_ref[mmco[i].long_arg]) {
608 h->long_ref[mmco[i].long_arg]->long_ref = 1;
612 case MMCO_LONG2UNUSED:
613 j = pic_num_extract(h, mmco[i].long_arg, &structure);
614 pic = h->long_ref[j];
616 remove_long(h, j, structure ^ PICT_FRAME);
617 } else if (h->avctx->debug & FF_DEBUG_MMCO)
618 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
621 // Comment below left from previous code as it is an interresting note.
622 /* First field in pair is in short term list or
623 * at a different long term index.
624 * This is not allowed; see 7.4.3.3, notes 2 and 3.
625 * Report the problem and keep the pair where it is,
626 * and mark this field valid.
629 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
630 if (h->cur_pic_ptr->long_ref) {
631 for(j=0; j<16; j++) {
632 if(h->long_ref[j] == h->cur_pic_ptr) {
633 remove_long(h, j, 0);
634 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
638 av_assert0(!h->cur_pic_ptr->long_ref);
639 remove_long(h, mmco[i].long_arg, 0);
640 if (remove_short(h, h->cur_pic_ptr->frame_num, 0)) {
641 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
644 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
645 h->long_ref[mmco[i].long_arg]->long_ref = 1;
649 h->cur_pic_ptr->reference |= h->picture_structure;
650 current_ref_assigned = 1;
652 case MMCO_SET_MAX_LONG:
653 assert(mmco[i].long_arg <= 16);
654 // just remove the long term which index is greater than new max
655 for (j = mmco[i].long_arg; j < 16; j++) {
656 remove_long(h, j, 0);
660 while (h->short_ref_count) {
661 remove_short(h, h->short_ref[0]->frame_num, 0);
663 for (j = 0; j < 16; j++) {
664 remove_long(h, j, 0);
666 h->frame_num = h->cur_pic_ptr->frame_num = 0;
668 h->cur_pic_ptr->mmco_reset = 1;
669 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
670 h->last_pocs[j] = INT_MIN;
676 if (!current_ref_assigned) {
677 /* Second field of complementary field pair; the first field of
678 * which is already referenced. If short referenced, it
679 * should be first entry in short_ref. If not, it must exist
680 * in long_ref; trying to put it on the short list here is an
681 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
683 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
684 /* Just mark the second field valid */
685 h->cur_pic_ptr->reference = PICT_FRAME;
686 } else if (h->cur_pic_ptr->long_ref) {
687 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
688 "assignment for second field "
689 "in complementary field pair "
690 "(first field is long term)\n");
691 err = AVERROR_INVALIDDATA;
693 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
695 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
696 err = AVERROR_INVALIDDATA;
699 if (h->short_ref_count)
700 memmove(&h->short_ref[1], &h->short_ref[0],
701 h->short_ref_count * sizeof(Picture*));
703 h->short_ref[0] = h->cur_pic_ptr;
704 h->short_ref_count++;
705 h->cur_pic_ptr->reference |= h->picture_structure;
709 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
711 /* We have too many reference frames, probably due to corrupted
712 * stream. Need to discard one frame. Prevents overrun of the
713 * short_ref and long_ref buffers.
715 av_log(h->avctx, AV_LOG_ERROR,
716 "number of reference frames (%d+%d) exceeds max (%d; probably "
717 "corrupt input), discarding one\n",
718 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
719 err = AVERROR_INVALIDDATA;
721 if (h->long_ref_count && !h->short_ref_count) {
722 for (i = 0; i < 16; ++i)
727 remove_long(h, i, 0);
729 pic = h->short_ref[h->short_ref_count - 1];
730 remove_short(h, pic->frame_num, 0);
737 if(err >= 0 && h->long_ref_count==0 && h->short_ref_count<=2 && h->pps.ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) && h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){
738 h->cur_pic_ptr->recovered |= 1;
739 if(!h->avctx->has_b_frames)
740 h->frame_recovered |= FRAME_RECOVERED_SEI;
743 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
746 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
750 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
753 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
754 skip_bits1(gb); // broken_link
756 mmco[0].opcode = MMCO_LONG;
757 mmco[0].long_arg = 0;
761 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
762 for (i = 0; i < MAX_MMCO_COUNT; i++) {
763 MMCOOpcode opcode = get_ue_golomb_31(gb);
765 mmco[i].opcode = opcode;
766 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
767 mmco[i].short_pic_num =
768 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
769 (h->max_pic_num - 1);
771 if (mmco[i].short_pic_num >= h->short_ref_count ||
772 h->short_ref[ mmco[i].short_pic_num ] == NULL){
773 av_log(s->avctx, AV_LOG_ERROR,
774 "illegal short ref in memory management control "
775 "operation %d\n", mmco);
780 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
781 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
782 unsigned int long_arg = get_ue_golomb_31(gb);
783 if (long_arg >= 32 ||
784 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
786 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
787 av_log(h->avctx, AV_LOG_ERROR,
788 "illegal long ref in memory management control "
789 "operation %d\n", opcode);
792 mmco[i].long_arg = long_arg;
795 if (opcode > (unsigned) MMCO_LONG) {
796 av_log(h->avctx, AV_LOG_ERROR,
797 "illegal memory management control operation %d\n",
801 if (opcode == MMCO_END)
807 ret = ff_generate_sliding_window_mmcos(h, first_slice);
808 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
815 if (first_slice && mmco_index != -1) {
816 memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
817 h->mmco_index = mmco_index;
818 } else if (!first_slice && mmco_index >= 0 &&
819 (mmco_index != h->mmco_index ||
820 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
821 av_log(h->avctx, AV_LOG_ERROR,
822 "Inconsistent MMCO state between slices [%d, %d]\n",
823 mmco_index, h->mmco_index);
824 return AVERROR_INVALIDDATA;