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"
37 #define COPY_PICTURE(dst, src) \
40 (dst)->f.extended_data = (dst)->f.data;\
41 (dst)->tf.f = &(dst)->f;\
45 static void pic_as_field(Picture *pic, const int parity){
47 for (i = 0; i < 4; ++i) {
48 if (parity == PICT_BOTTOM_FIELD)
49 pic->f.data[i] += pic->f.linesize[i];
50 pic->reference = parity;
51 pic->f.linesize[i] *= 2;
53 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
56 static int split_field_copy(Picture *dest, Picture *src, int parity, int id_add)
58 int match = !!(src->reference & parity);
61 COPY_PICTURE(dest, src);
62 if (parity != PICT_FRAME) {
63 pic_as_field(dest, parity);
65 dest->pic_id += id_add;
72 static int build_def_list(Picture *def, 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 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
84 split_field_copy(&def[index++], in[i[0]++], sel, 1);
87 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
88 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
95 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir)
101 best_poc = dir ? INT_MIN : INT_MAX;
103 for (i = 0; i < len; i++) {
104 const int poc = src[i]->poc;
105 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
107 sorted[out_i] = src[i];
110 if (best_poc == (dir ? INT_MIN : INT_MAX))
112 limit = sorted[out_i++]->poc - dir;
117 int ff_h264_fill_default_ref_list(H264Context *h)
121 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
126 if (FIELD_PICTURE(h))
127 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
129 cur_poc = h->cur_pic_ptr->poc;
131 for (list = 0; list < 2; list++) {
132 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
133 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
134 av_assert0(len <= 32);
135 len = build_def_list(h->default_ref_list[list], sorted, len, 0, h->picture_structure);
136 len += build_def_list(h->default_ref_list[list] + len, h->long_ref, 16, 1, h->picture_structure);
137 av_assert0(len <= 32);
139 if (len < h->ref_count[list])
140 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
144 if (lens[0] == lens[1] && lens[1] > 1) {
145 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++);
148 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
149 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
150 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
154 len = build_def_list(h->default_ref_list[0], h->short_ref, h->short_ref_count, 0, h->picture_structure);
155 len += build_def_list(h->default_ref_list[0] + len, h-> long_ref, 16, 1, h->picture_structure);
156 av_assert0(len <= 32);
157 if (len < h->ref_count[0])
158 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
161 for (i = 0; i < h->ref_count[0]; i++) {
162 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
163 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
164 h->default_ref_list[0][i].pic_id,
165 h->default_ref_list[0][i].f.data[0]);
167 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
168 for (i = 0; i < h->ref_count[1]; i++) {
169 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
170 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
171 h->default_ref_list[1][i].pic_id,
172 h->default_ref_list[1][i].f.data[0]);
179 static void print_short_term(H264Context *h);
180 static void print_long_term(H264Context *h);
183 * Extract structure information about the picture described by pic_num in
184 * the current decoding context (frame or field). Note that pic_num is
185 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
186 * @param pic_num picture number for which to extract structure information
187 * @param structure one of PICT_XXX describing structure of picture
189 * @return frame number (short term) or long term index of picture
190 * described by pic_num
192 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
194 *structure = h->picture_structure;
195 if (FIELD_PICTURE(h)) {
198 *structure ^= PICT_FRAME;
205 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
207 int list, index, pic_structure, i;
212 for (list = 0; list < h->list_count; list++) {
213 for (i = 0; i < h->ref_count[list]; i++)
214 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
216 if (get_bits1(&h->gb)) {
217 int pred = h->curr_pic_num;
219 for (index = 0; ; index++) {
220 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
225 if (reordering_of_pic_nums_idc == 3)
228 if (index >= h->ref_count[list]) {
229 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
233 if (reordering_of_pic_nums_idc < 3) {
234 if (reordering_of_pic_nums_idc < 2) {
235 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
238 if (abs_diff_pic_num > h->max_pic_num) {
239 av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
243 if (reordering_of_pic_nums_idc == 0)
244 pred -= abs_diff_pic_num;
246 pred += abs_diff_pic_num;
247 pred &= h->max_pic_num - 1;
249 frame_num = pic_num_extract(h, pred, &pic_structure);
251 for (i = h->short_ref_count - 1; i >= 0; i--) {
252 ref = h->short_ref[i];
253 assert(ref->reference);
254 assert(!ref->long_ref);
255 if (ref->frame_num == frame_num &&
256 (ref->reference & pic_structure))
263 pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx
265 long_idx = pic_num_extract(h, pic_id, &pic_structure);
268 av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
271 ref = h->long_ref[long_idx];
272 assert(!(ref && !ref->reference));
273 if (ref && (ref->reference & pic_structure)) {
274 ref->pic_id = pic_id;
275 assert(ref->long_ref);
283 av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
284 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
286 for (i = index; i + 1 < h->ref_count[list]; i++) {
287 if (ref->long_ref == h->ref_list[list][i].long_ref &&
288 ref->pic_id == h->ref_list[list][i].pic_id)
291 for (; i > index; i--) {
292 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
294 COPY_PICTURE(&h->ref_list[list][index], ref);
295 if (FIELD_PICTURE(h)) {
296 pic_as_field(&h->ref_list[list][index], pic_structure);
300 av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
306 for (list = 0; list < h->list_count; list++) {
307 for (index = 0; index < h->ref_count[list]; index++) {
308 if ( !h->ref_list[list][index].f.data[0]
309 || (!FIELD_PICTURE(h) && (h->ref_list[list][index].reference&3) != 3)) {
311 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
312 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
313 h->last_pocs[i] = INT_MIN;
314 if (h->default_ref_list[list][0].f.data[0]
315 && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3))
316 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
320 av_assert0(av_buffer_get_ref_count(h->ref_list[list][index].f.buf[0]) > 0);
327 void ff_h264_fill_mbaff_ref_list(H264Context *h)
330 for (list = 0; list < h->list_count; list++) {
331 for (i = 0; i < h->ref_count[list]; i++) {
332 Picture *frame = &h->ref_list[list][i];
333 Picture *field = &h->ref_list[list][16 + 2 * i];
334 COPY_PICTURE(field, frame);
335 for (j = 0; j < 3; j++)
336 field[0].f.linesize[j] <<= 1;
337 field[0].reference = PICT_TOP_FIELD;
338 field[0].poc = field[0].field_poc[0];
339 COPY_PICTURE(field + 1, field);
340 for (j = 0; j < 3; j++)
341 field[1].f.data[j] += frame->f.linesize[j];
342 field[1].reference = PICT_BOTTOM_FIELD;
343 field[1].poc = field[1].field_poc[1];
345 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
346 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
347 for (j = 0; j < 2; j++) {
348 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];
349 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];
356 * Mark a picture as no longer needed for reference. The refmask
357 * argument allows unreferencing of individual fields or the whole frame.
358 * If the picture becomes entirely unreferenced, but is being held for
359 * display purposes, it is marked as such.
360 * @param refmask mask of fields to unreference; the mask is bitwise
361 * anded with the reference marking of pic
362 * @return non-zero if pic becomes entirely unreferenced (except possibly
363 * for display purposes) zero if one of the fields remains in
366 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
369 if (pic->reference &= refmask) {
372 for(i = 0; h->delayed_pic[i]; i++)
373 if(pic == h->delayed_pic[i]){
374 pic->reference = DELAYED_PIC_REF;
382 * Find a Picture in the short term reference list by frame number.
383 * @param frame_num frame number to search for
384 * @param idx the index into h->short_ref where returned picture is found
385 * undefined if no picture found.
386 * @return pointer to the found picture, or NULL if no pic with the provided
387 * frame number is found
389 static Picture *find_short(H264Context *h, int frame_num, int *idx)
393 for (i = 0; i < h->short_ref_count; i++) {
394 Picture *pic = h->short_ref[i];
395 if (h->avctx->debug & FF_DEBUG_MMCO)
396 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
397 if (pic->frame_num == frame_num) {
406 * Remove a picture from the short term reference list by its index in
407 * that list. This does no checking on the provided index; it is assumed
408 * to be valid. Other list entries are shifted down.
409 * @param i index into h->short_ref of picture to remove.
411 static void remove_short_at_index(H264Context *h, int i)
413 assert(i >= 0 && i < h->short_ref_count);
414 h->short_ref[i] = NULL;
415 if (--h->short_ref_count)
416 memmove(&h->short_ref[i], &h->short_ref[i + 1],
417 (h->short_ref_count - i) * sizeof(Picture*));
422 * @return the removed picture or NULL if an error occurs
424 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
429 if (h->avctx->debug & FF_DEBUG_MMCO)
430 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
432 pic = find_short(h, frame_num, &i);
434 if (unreference_pic(h, pic, ref_mask))
435 remove_short_at_index(h, i);
442 * Remove a picture from the long term reference list by its index in
444 * @return the removed picture or NULL if an error occurs
446 static Picture *remove_long(H264Context *h, int i, int ref_mask)
450 pic = h->long_ref[i];
452 if (unreference_pic(h, pic, ref_mask)) {
453 assert(h->long_ref[i]->long_ref == 1);
454 h->long_ref[i]->long_ref = 0;
455 h->long_ref[i] = NULL;
463 void ff_h264_remove_all_refs(H264Context *h)
467 for (i = 0; i < 16; i++) {
468 remove_long(h, i, 0);
470 assert(h->long_ref_count == 0);
472 for (i = 0; i < h->short_ref_count; i++) {
473 unreference_pic(h, h->short_ref[i], 0);
474 h->short_ref[i] = NULL;
476 h->short_ref_count = 0;
478 memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
479 memset(h->ref_list, 0, sizeof(h->ref_list));
483 * print short term list
485 static void print_short_term(H264Context *h)
488 if (h->avctx->debug & FF_DEBUG_MMCO) {
489 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
490 for (i = 0; i < h->short_ref_count; i++) {
491 Picture *pic = h->short_ref[i];
492 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
493 i, pic->frame_num, pic->poc, pic->f.data[0]);
499 * print long term list
501 static void print_long_term(H264Context *h)
504 if (h->avctx->debug & FF_DEBUG_MMCO) {
505 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
506 for (i = 0; i < 16; i++) {
507 Picture *pic = h->long_ref[i];
509 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
510 i, pic->frame_num, pic->poc, pic->f.data[0]);
516 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
520 for (i = 0; i < n_mmcos; i++) {
521 if (mmco1[i].opcode != mmco2[i].opcode) {
522 av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
523 mmco1[i].opcode, mmco2[i].opcode, i);
531 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
533 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
534 int mmco_index = 0, i;
536 if (h->short_ref_count &&
537 h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count &&
538 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
539 mmco[0].opcode = MMCO_SHORT2UNUSED;
540 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
542 if (FIELD_PICTURE(h)) {
543 mmco[0].short_pic_num *= 2;
544 mmco[1].opcode = MMCO_SHORT2UNUSED;
545 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
551 h->mmco_index = mmco_index;
552 } else if (!first_slice && mmco_index >= 0 &&
553 (mmco_index != h->mmco_index ||
554 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
555 av_log(h->avctx, AV_LOG_ERROR,
556 "Inconsistent MMCO state between slices [%d, %d]\n",
557 mmco_index, h->mmco_index);
558 return AVERROR_INVALIDDATA;
563 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
566 int current_ref_assigned = 0, err = 0;
567 Picture *av_uninit(pic);
569 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
570 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
572 for (i = 0; i < mmco_count; i++) {
573 int av_uninit(structure), av_uninit(frame_num);
574 if (h->avctx->debug & FF_DEBUG_MMCO)
575 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
576 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
578 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
579 mmco[i].opcode == MMCO_SHORT2LONG) {
580 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
581 pic = find_short(h, frame_num, &j);
583 if (mmco[i].opcode != MMCO_SHORT2LONG ||
584 !h->long_ref[mmco[i].long_arg] ||
585 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
586 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
587 err = AVERROR_INVALIDDATA;
593 switch (mmco[i].opcode) {
594 case MMCO_SHORT2UNUSED:
595 if (h->avctx->debug & FF_DEBUG_MMCO)
596 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
597 h->mmco[i].short_pic_num, h->short_ref_count);
598 remove_short(h, frame_num, structure ^ PICT_FRAME);
600 case MMCO_SHORT2LONG:
601 if (h->long_ref[mmco[i].long_arg] != pic)
602 remove_long(h, mmco[i].long_arg, 0);
604 remove_short_at_index(h, j);
605 h->long_ref[ mmco[i].long_arg ] = pic;
606 if (h->long_ref[mmco[i].long_arg]) {
607 h->long_ref[mmco[i].long_arg]->long_ref = 1;
611 case MMCO_LONG2UNUSED:
612 j = pic_num_extract(h, mmco[i].long_arg, &structure);
613 pic = h->long_ref[j];
615 remove_long(h, j, structure ^ PICT_FRAME);
616 } else if (h->avctx->debug & FF_DEBUG_MMCO)
617 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
620 // Comment below left from previous code as it is an interresting note.
621 /* First field in pair is in short term list or
622 * at a different long term index.
623 * This is not allowed; see 7.4.3.3, notes 2 and 3.
624 * Report the problem and keep the pair where it is,
625 * and mark this field valid.
628 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
629 if (h->cur_pic_ptr->long_ref) {
630 for(j=0; j<16; j++) {
631 if(h->long_ref[j] == h->cur_pic_ptr) {
632 remove_long(h, j, 0);
633 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
637 av_assert0(!h->cur_pic_ptr->long_ref);
638 remove_long(h, mmco[i].long_arg, 0);
639 if (remove_short(h, h->cur_pic_ptr->frame_num, 0)) {
640 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
643 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
644 h->long_ref[mmco[i].long_arg]->long_ref = 1;
648 h->cur_pic_ptr->reference |= h->picture_structure;
649 current_ref_assigned = 1;
651 case MMCO_SET_MAX_LONG:
652 assert(mmco[i].long_arg <= 16);
653 // just remove the long term which index is greater than new max
654 for (j = mmco[i].long_arg; j < 16; j++) {
655 remove_long(h, j, 0);
659 while (h->short_ref_count) {
660 remove_short(h, h->short_ref[0]->frame_num, 0);
662 for (j = 0; j < 16; j++) {
663 remove_long(h, j, 0);
665 h->frame_num = h->cur_pic_ptr->frame_num = 0;
667 h->cur_pic_ptr->mmco_reset = 1;
668 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
669 h->last_pocs[j] = INT_MIN;
675 if (!current_ref_assigned) {
676 /* Second field of complementary field pair; the first field of
677 * which is already referenced. If short referenced, it
678 * should be first entry in short_ref. If not, it must exist
679 * in long_ref; trying to put it on the short list here is an
680 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
682 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
683 /* Just mark the second field valid */
684 h->cur_pic_ptr->reference = PICT_FRAME;
685 } else if (h->cur_pic_ptr->long_ref) {
686 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
687 "assignment for second field "
688 "in complementary field pair "
689 "(first field is long term)\n");
690 err = AVERROR_INVALIDDATA;
692 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
694 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
695 err = AVERROR_INVALIDDATA;
698 if (h->short_ref_count)
699 memmove(&h->short_ref[1], &h->short_ref[0],
700 h->short_ref_count * sizeof(Picture*));
702 h->short_ref[0] = h->cur_pic_ptr;
703 h->short_ref_count++;
704 h->cur_pic_ptr->reference |= h->picture_structure;
708 if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
710 /* We have too many reference frames, probably due to corrupted
711 * stream. Need to discard one frame. Prevents overrun of the
712 * short_ref and long_ref buffers.
714 av_log(h->avctx, AV_LOG_ERROR,
715 "number of reference frames (%d+%d) exceeds max (%d; probably "
716 "corrupt input), discarding one\n",
717 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
718 err = AVERROR_INVALIDDATA;
720 if (h->long_ref_count && !h->short_ref_count) {
721 for (i = 0; i < 16; ++i)
726 remove_long(h, i, 0);
728 pic = h->short_ref[h->short_ref_count - 1];
729 remove_short(h, pic->frame_num, 0);
736 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){
737 h->cur_pic_ptr->sync |= 1;
738 if(!h->avctx->has_b_frames)
742 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
745 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
749 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
752 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
753 skip_bits1(gb); // broken_link
755 mmco[0].opcode = MMCO_LONG;
756 mmco[0].long_arg = 0;
760 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
761 for (i = 0; i < MAX_MMCO_COUNT; i++) {
762 MMCOOpcode opcode = get_ue_golomb_31(gb);
764 mmco[i].opcode = opcode;
765 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
766 mmco[i].short_pic_num =
767 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
768 (h->max_pic_num - 1);
770 if (mmco[i].short_pic_num >= h->short_ref_count ||
771 h->short_ref[ mmco[i].short_pic_num ] == NULL){
772 av_log(s->avctx, AV_LOG_ERROR,
773 "illegal short ref in memory management control "
774 "operation %d\n", mmco);
779 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
780 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
781 unsigned int long_arg = get_ue_golomb_31(gb);
782 if (long_arg >= 32 ||
783 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
785 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
786 av_log(h->avctx, AV_LOG_ERROR,
787 "illegal long ref in memory management control "
788 "operation %d\n", opcode);
791 mmco[i].long_arg = long_arg;
794 if (opcode > (unsigned) MMCO_LONG) {
795 av_log(h->avctx, AV_LOG_ERROR,
796 "illegal memory management control operation %d\n",
800 if (opcode == MMCO_END)
806 ret = ff_generate_sliding_window_mmcos(h, first_slice);
807 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
814 if (first_slice && mmco_index != -1) {
815 memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
816 h->mmco_index = mmco_index;
817 } else if (!first_slice && mmco_index >= 0 &&
818 (mmco_index != h->mmco_index ||
819 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
820 av_log(h->avctx, AV_LOG_ERROR,
821 "Inconsistent MMCO state between slices [%d, %d]\n",
822 mmco_index, h->mmco_index);
823 return AVERROR_INVALIDDATA;