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; h->default_ref_list[0][i].f.data[0] == h->default_ref_list[1][i].f.data[0] && i < lens[0]; i++);
147 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
148 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
149 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
153 len = build_def_list(h->default_ref_list[0], h->short_ref, h->short_ref_count, 0, h->picture_structure);
154 len += build_def_list(h->default_ref_list[0] + len, h-> long_ref, 16, 1, h->picture_structure);
155 av_assert0(len <= 32);
156 if (len < h->ref_count[0])
157 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
160 for (i = 0; i < h->ref_count[0]; i++) {
161 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
162 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
163 h->default_ref_list[0][i].pic_id,
164 h->default_ref_list[0][i].f.data[0]);
166 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
167 for (i = 0; i < h->ref_count[1]; i++) {
168 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
169 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
170 h->default_ref_list[1][i].pic_id,
171 h->default_ref_list[1][i].f.data[0]);
178 static void print_short_term(H264Context *h);
179 static void print_long_term(H264Context *h);
182 * Extract structure information about the picture described by pic_num in
183 * the current decoding context (frame or field). Note that pic_num is
184 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
185 * @param pic_num picture number for which to extract structure information
186 * @param structure one of PICT_XXX describing structure of picture
188 * @return frame number (short term) or long term index of picture
189 * described by pic_num
191 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
193 *structure = h->picture_structure;
194 if (FIELD_PICTURE(h)) {
197 *structure ^= PICT_FRAME;
204 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
206 int list, index, pic_structure, i;
211 for (list = 0; list < h->list_count; list++) {
212 for (i = 0; i < h->ref_count[list]; i++)
213 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
215 if (get_bits1(&h->gb)) {
216 int pred = h->curr_pic_num;
218 for (index = 0; ; index++) {
219 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
224 if (reordering_of_pic_nums_idc == 3)
227 if (index >= h->ref_count[list]) {
228 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
232 if (reordering_of_pic_nums_idc < 3) {
233 if (reordering_of_pic_nums_idc < 2) {
234 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
237 if (abs_diff_pic_num > h->max_pic_num) {
238 av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
242 if (reordering_of_pic_nums_idc == 0)
243 pred -= abs_diff_pic_num;
245 pred += abs_diff_pic_num;
246 pred &= h->max_pic_num - 1;
248 frame_num = pic_num_extract(h, pred, &pic_structure);
250 for (i = h->short_ref_count - 1; i >= 0; i--) {
251 ref = h->short_ref[i];
252 assert(ref->reference);
253 assert(!ref->long_ref);
254 if (ref->frame_num == frame_num &&
255 (ref->reference & pic_structure))
262 pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx
264 long_idx = pic_num_extract(h, pic_id, &pic_structure);
267 av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
270 ref = h->long_ref[long_idx];
271 assert(!(ref && !ref->reference));
272 if (ref && (ref->reference & pic_structure)) {
273 ref->pic_id = pic_id;
274 assert(ref->long_ref);
282 av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
283 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
285 for (i = index; i + 1 < h->ref_count[list]; i++) {
286 if (ref->long_ref == h->ref_list[list][i].long_ref &&
287 ref->pic_id == h->ref_list[list][i].pic_id)
290 for (; i > index; i--) {
291 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
293 COPY_PICTURE(&h->ref_list[list][index], ref);
294 if (FIELD_PICTURE(h)) {
295 pic_as_field(&h->ref_list[list][index], pic_structure);
299 av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
305 for (list = 0; list < h->list_count; list++) {
306 for (index = 0; index < h->ref_count[list]; index++) {
307 if ( !h->ref_list[list][index].f.data[0]
308 || (!FIELD_PICTURE(h) && (h->ref_list[list][index].reference&3) != 3)) {
310 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
311 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
312 h->last_pocs[i] = INT_MIN;
313 if (h->default_ref_list[list][0].f.data[0]
314 && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3))
315 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
319 av_assert0(av_buffer_get_ref_count(h->ref_list[list][index].f.buf[0]) > 0);
326 void ff_h264_fill_mbaff_ref_list(H264Context *h)
329 for (list = 0; list < h->list_count; list++) {
330 for (i = 0; i < h->ref_count[list]; i++) {
331 Picture *frame = &h->ref_list[list][i];
332 Picture *field = &h->ref_list[list][16 + 2 * i];
333 COPY_PICTURE(field, frame);
334 for (j = 0; j < 3; j++)
335 field[0].f.linesize[j] <<= 1;
336 field[0].reference = PICT_TOP_FIELD;
337 field[0].poc = field[0].field_poc[0];
338 COPY_PICTURE(field + 1, field);
339 for (j = 0; j < 3; j++)
340 field[1].f.data[j] += frame->f.linesize[j];
341 field[1].reference = PICT_BOTTOM_FIELD;
342 field[1].poc = field[1].field_poc[1];
344 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
345 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
346 for (j = 0; j < 2; j++) {
347 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];
348 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];
355 * Mark a picture as no longer needed for reference. The refmask
356 * argument allows unreferencing of individual fields or the whole frame.
357 * If the picture becomes entirely unreferenced, but is being held for
358 * display purposes, it is marked as such.
359 * @param refmask mask of fields to unreference; the mask is bitwise
360 * anded with the reference marking of pic
361 * @return non-zero if pic becomes entirely unreferenced (except possibly
362 * for display purposes) zero if one of the fields remains in
365 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
368 if (pic->reference &= refmask) {
371 for(i = 0; h->delayed_pic[i]; i++)
372 if(pic == h->delayed_pic[i]){
373 pic->reference = DELAYED_PIC_REF;
381 * Find a Picture in the short term reference list by frame number.
382 * @param frame_num frame number to search for
383 * @param idx the index into h->short_ref where returned picture is found
384 * undefined if no picture found.
385 * @return pointer to the found picture, or NULL if no pic with the provided
386 * frame number is found
388 static Picture *find_short(H264Context *h, int frame_num, int *idx)
392 for (i = 0; i < h->short_ref_count; i++) {
393 Picture *pic = h->short_ref[i];
394 if (h->avctx->debug & FF_DEBUG_MMCO)
395 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
396 if (pic->frame_num == frame_num) {
405 * Remove a picture from the short term reference list by its index in
406 * that list. This does no checking on the provided index; it is assumed
407 * to be valid. Other list entries are shifted down.
408 * @param i index into h->short_ref of picture to remove.
410 static void remove_short_at_index(H264Context *h, int i)
412 assert(i >= 0 && i < h->short_ref_count);
413 h->short_ref[i] = NULL;
414 if (--h->short_ref_count)
415 memmove(&h->short_ref[i], &h->short_ref[i + 1],
416 (h->short_ref_count - i) * sizeof(Picture*));
421 * @return the removed picture or NULL if an error occurs
423 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
428 if (h->avctx->debug & FF_DEBUG_MMCO)
429 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
431 pic = find_short(h, frame_num, &i);
433 if (unreference_pic(h, pic, ref_mask))
434 remove_short_at_index(h, i);
441 * Remove a picture from the long term reference list by its index in
443 * @return the removed picture or NULL if an error occurs
445 static Picture *remove_long(H264Context *h, int i, int ref_mask)
449 pic = h->long_ref[i];
451 if (unreference_pic(h, pic, ref_mask)) {
452 assert(h->long_ref[i]->long_ref == 1);
453 h->long_ref[i]->long_ref = 0;
454 h->long_ref[i] = NULL;
462 void ff_h264_remove_all_refs(H264Context *h)
466 for (i = 0; i < 16; i++) {
467 remove_long(h, i, 0);
469 assert(h->long_ref_count == 0);
471 for (i = 0; i < h->short_ref_count; i++) {
472 unreference_pic(h, h->short_ref[i], 0);
473 h->short_ref[i] = NULL;
475 h->short_ref_count = 0;
477 memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
478 memset(h->ref_list, 0, sizeof(h->ref_list));
482 * print short term list
484 static void print_short_term(H264Context *h)
487 if (h->avctx->debug & FF_DEBUG_MMCO) {
488 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
489 for (i = 0; i < h->short_ref_count; i++) {
490 Picture *pic = h->short_ref[i];
491 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
492 i, pic->frame_num, pic->poc, pic->f.data[0]);
498 * print long term list
500 static void print_long_term(H264Context *h)
503 if (h->avctx->debug & FF_DEBUG_MMCO) {
504 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
505 for (i = 0; i < 16; i++) {
506 Picture *pic = h->long_ref[i];
508 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
509 i, pic->frame_num, pic->poc, pic->f.data[0]);
515 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
519 for (i = 0; i < n_mmcos; i++) {
520 if (mmco1[i].opcode != mmco2[i].opcode) {
521 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
522 mmco1[i].opcode, mmco2[i].opcode, i);
530 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
532 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
533 int mmco_index = 0, i;
535 if (h->short_ref_count &&
536 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
537 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
538 mmco[0].opcode = MMCO_SHORT2UNUSED;
539 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
541 if (FIELD_PICTURE(h)) {
542 mmco[0].short_pic_num *= 2;
543 mmco[1].opcode = MMCO_SHORT2UNUSED;
544 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
550 h->mmco_index = mmco_index;
551 } else if (!first_slice && mmco_index >= 0 &&
552 (mmco_index != h->mmco_index ||
553 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
554 av_log(h->avctx, AV_LOG_ERROR,
555 "Inconsistent MMCO state between slices [%d, %d]\n",
556 mmco_index, h->mmco_index);
557 return AVERROR_INVALIDDATA;
562 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
565 int current_ref_assigned = 0, err = 0;
566 Picture *av_uninit(pic);
568 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
569 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
571 for (i = 0; i < mmco_count; i++) {
572 int av_uninit(structure), av_uninit(frame_num);
573 if (h->avctx->debug & FF_DEBUG_MMCO)
574 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
575 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
577 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
578 mmco[i].opcode == MMCO_SHORT2LONG) {
579 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
580 pic = find_short(h, frame_num, &j);
582 if (mmco[i].opcode != MMCO_SHORT2LONG ||
583 !h->long_ref[mmco[i].long_arg] ||
584 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
585 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
586 err = AVERROR_INVALIDDATA;
592 switch (mmco[i].opcode) {
593 case MMCO_SHORT2UNUSED:
594 if (h->avctx->debug & FF_DEBUG_MMCO)
595 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
596 h->mmco[i].short_pic_num, h->short_ref_count);
597 remove_short(h, frame_num, structure ^ PICT_FRAME);
599 case MMCO_SHORT2LONG:
600 if (h->long_ref[mmco[i].long_arg] != pic)
601 remove_long(h, mmco[i].long_arg, 0);
603 remove_short_at_index(h, j);
604 h->long_ref[ mmco[i].long_arg ] = pic;
605 if (h->long_ref[mmco[i].long_arg]) {
606 h->long_ref[mmco[i].long_arg]->long_ref = 1;
610 case MMCO_LONG2UNUSED:
611 j = pic_num_extract(h, mmco[i].long_arg, &structure);
612 pic = h->long_ref[j];
614 remove_long(h, j, structure ^ PICT_FRAME);
615 } else if (h->avctx->debug & FF_DEBUG_MMCO)
616 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
619 // Comment below left from previous code as it is an interresting note.
620 /* First field in pair is in short term list or
621 * at a different long term index.
622 * This is not allowed; see 7.4.3.3, notes 2 and 3.
623 * Report the problem and keep the pair where it is,
624 * and mark this field valid.
627 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
628 if (h->cur_pic_ptr->long_ref) {
629 for(j=0; j<16; j++) {
630 if(h->long_ref[j] == h->cur_pic_ptr) {
631 remove_long(h, j, 0);
632 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
636 av_assert0(!h->cur_pic_ptr->long_ref);
637 remove_long(h, mmco[i].long_arg, 0);
638 if (remove_short(h, h->cur_pic_ptr->frame_num, 0)) {
639 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
642 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
643 h->long_ref[mmco[i].long_arg]->long_ref = 1;
647 h->cur_pic_ptr->reference |= h->picture_structure;
648 current_ref_assigned = 1;
650 case MMCO_SET_MAX_LONG:
651 assert(mmco[i].long_arg <= 16);
652 // just remove the long term which index is greater than new max
653 for (j = mmco[i].long_arg; j < 16; j++) {
654 remove_long(h, j, 0);
658 while (h->short_ref_count) {
659 remove_short(h, h->short_ref[0]->frame_num, 0);
661 for (j = 0; j < 16; j++) {
662 remove_long(h, j, 0);
664 h->frame_num = h->cur_pic_ptr->frame_num = 0;
666 h->cur_pic_ptr->mmco_reset = 1;
667 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
668 h->last_pocs[j] = INT_MIN;
674 if (!current_ref_assigned) {
675 /* Second field of complementary field pair; the first field of
676 * which is already referenced. If short referenced, it
677 * should be first entry in short_ref. If not, it must exist
678 * in long_ref; trying to put it on the short list here is an
679 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
681 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
682 /* Just mark the second field valid */
683 h->cur_pic_ptr->reference = PICT_FRAME;
684 } else if (h->cur_pic_ptr->long_ref) {
685 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
686 "assignment for second field "
687 "in complementary field pair "
688 "(first field is long term)\n");
689 err = AVERROR_INVALIDDATA;
691 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
693 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
694 err = AVERROR_INVALIDDATA;
697 if (h->short_ref_count)
698 memmove(&h->short_ref[1], &h->short_ref[0],
699 h->short_ref_count * sizeof(Picture*));
701 h->short_ref[0] = h->cur_pic_ptr;
702 h->short_ref_count++;
703 h->cur_pic_ptr->reference |= h->picture_structure;
707 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
709 /* We have too many reference frames, probably due to corrupted
710 * stream. Need to discard one frame. Prevents overrun of the
711 * short_ref and long_ref buffers.
713 av_log(h->avctx, AV_LOG_ERROR,
714 "number of reference frames (%d+%d) exceeds max (%d; probably "
715 "corrupt input), discarding one\n",
716 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
717 err = AVERROR_INVALIDDATA;
719 if (h->long_ref_count && !h->short_ref_count) {
720 for (i = 0; i < 16; ++i)
725 remove_long(h, i, 0);
727 pic = h->short_ref[h->short_ref_count - 1];
728 remove_short(h, pic->frame_num, 0);
735 if(err >= 0 && h->long_ref_count==0 && h->short_ref_count<=2 && h->pps.ref_count[0]<=1 + (h->picture_structure != PICT_FRAME) && h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){
736 h->cur_pic_ptr->sync |= 1;
737 if(!h->avctx->has_b_frames)
741 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
744 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
748 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
751 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
752 skip_bits1(gb); // broken_link
754 mmco[0].opcode = MMCO_LONG;
755 mmco[0].long_arg = 0;
759 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
760 for (i = 0; i < MAX_MMCO_COUNT; i++) {
761 MMCOOpcode opcode = get_ue_golomb_31(gb);
763 mmco[i].opcode = opcode;
764 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
765 mmco[i].short_pic_num =
766 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
767 (h->max_pic_num - 1);
769 if (mmco[i].short_pic_num >= h->short_ref_count ||
770 h->short_ref[ mmco[i].short_pic_num ] == NULL){
771 av_log(s->avctx, AV_LOG_ERROR,
772 "illegal short ref in memory management control "
773 "operation %d\n", mmco);
778 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
779 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
780 unsigned int long_arg = get_ue_golomb_31(gb);
781 if (long_arg >= 32 ||
782 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
784 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
785 av_log(h->avctx, AV_LOG_ERROR,
786 "illegal long ref in memory management control "
787 "operation %d\n", opcode);
790 mmco[i].long_arg = long_arg;
793 if (opcode > (unsigned) MMCO_LONG) {
794 av_log(h->avctx, AV_LOG_ERROR,
795 "illegal memory management control operation %d\n",
799 if (opcode == MMCO_END)
805 ret = ff_generate_sliding_window_mmcos(h, first_slice);
806 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
813 if (first_slice && mmco_index != -1) {
814 memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
815 h->mmco_index = mmco_index;
816 } else if (!first_slice && mmco_index >= 0 &&
817 (mmco_index != h->mmco_index ||
818 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
819 av_log(h->avctx, AV_LOG_ERROR,
820 "Inconsistent MMCO state between slices [%d, %d]\n",
821 mmco_index, h->mmco_index);
822 return AVERROR_INVALIDDATA;