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h264_refs.c
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1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 /**
23  * @file
24  * H.264 / AVC / MPEG4 part10 reference picture handling.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #include <inttypes.h>
29 
30 #include "libavutil/avassert.h"
31 #include "internal.h"
32 #include "avcodec.h"
33 #include "h264.h"
34 #include "golomb.h"
35 #include "mpegutils.h"
36 
37 #include <assert.h>
38 
39 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41  int i;
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;
47  }
48  pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
49 }
50 
52 {
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;
56  dst->poc = src->poc;
57  dst->pic_id = src->pic_id;
58  dst->parent = src;
59 }
60 
61 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
62 {
63  int match = !!(src->reference & parity);
64 
65  if (match) {
66  ref_from_h264pic(dest, src);
67  if (parity != PICT_FRAME) {
68  pic_as_field(dest, parity);
69  dest->pic_id *= 2;
70  dest->pic_id += id_add;
71  }
72  }
73 
74  return match;
75 }
76 
77 static int build_def_list(H264Ref *def, int def_len,
78  H264Picture **in, int len, int is_long, int sel)
79 {
80  int i[2] = { 0 };
81  int index = 0;
82 
83  while (i[0] < len || i[1] < len) {
84  while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85  i[0]++;
86  while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87  i[1]++;
88  if (i[0] < len) {
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);
92  }
93  if (i[1] < len) {
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);
97  }
98  }
99 
100  return index;
101 }
102 
103 static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir)
104 {
105  int i, best_poc;
106  int out_i = 0;
107 
108  for (;;) {
109  best_poc = dir ? INT_MIN : INT_MAX;
110 
111  for (i = 0; i < len; i++) {
112  const int poc = src[i]->poc;
113  if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
114  best_poc = poc;
115  sorted[out_i] = src[i];
116  }
117  }
118  if (best_poc == (dir ? INT_MIN : INT_MAX))
119  break;
120  limit = sorted[out_i++]->poc - dir;
121  }
122  return out_i;
123 }
124 
126 {
127  int i, len;
128  int j;
129 
130  if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
131  H264Picture *sorted[32];
132  int cur_poc, list;
133  int lens[2];
134 
135  if (FIELD_PICTURE(h))
137  else
138  cur_poc = h->cur_pic_ptr->poc;
139 
140  for (list = 0; list < 2; list++) {
141  len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
142  len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
143  av_assert0(len <= 32);
144 
146  sorted, len, 0, h->picture_structure);
147  len += build_def_list(h->default_ref_list[list] + len,
148  FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
149  h->long_ref, 16, 1, h->picture_structure);
150  av_assert0(len <= 32);
151 
152  if (len < sl->ref_count[list])
153  memset(&h->default_ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
154  lens[list] = len;
155  }
156 
157  if (lens[0] == lens[1] && lens[1] > 1) {
158  for (i = 0; i < lens[0] &&
159  h->default_ref_list[0][i].parent->f->buf[0]->buffer ==
160  h->default_ref_list[1][i].parent->f->buf[0]->buffer; i++);
161  if (i == lens[0]) {
162  FFSWAP(H264Ref, h->default_ref_list[1][0], h->default_ref_list[1][1]);
163  }
164  }
165  } else {
168  len += build_def_list(h->default_ref_list[0] + len,
169  FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
170  h-> long_ref, 16, 1, h->picture_structure);
171  av_assert0(len <= 32);
172 
173  if (len < sl->ref_count[0])
174  memset(&h->default_ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
175  }
176 #ifdef TRACE
177  for (i = 0; i < sl->ref_count[0]; i++) {
178  ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
179  h->default_ref_list[0][i].parent ? (h->default_ref_list[0][i].parent->long_ref ? "LT" : "ST") : "NULL",
180  h->default_ref_list[0][i].pic_id,
181  h->default_ref_list[0][i].parent ? h->default_ref_list[0][i].parent->f->data[0] : 0);
182  }
183  if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
184  for (i = 0; i < sl->ref_count[1]; i++) {
185  ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
186  h->default_ref_list[1][i].parent ? (h->default_ref_list[1][i].parent->long_ref ? "LT" : "ST") : "NULL",
187  h->default_ref_list[1][i].pic_id,
188  h->default_ref_list[1][i].parent ? h->default_ref_list[1][i].parent->f->data[0] : 0);
189  }
190  }
191 #endif
192 
193  for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
194  for (i = 0; i < sl->ref_count[j]; i++) {
195  if (h->default_ref_list[j][i].parent) {
196  AVFrame *f = h->default_ref_list[j][i].parent->f;
197  if (h->cur_pic_ptr->f->width != f->width ||
198  h->cur_pic_ptr->f->height != f->height ||
199  h->cur_pic_ptr->f->format != f->format) {
200  av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
201  memset(&h->default_ref_list[j][i], 0, sizeof(h->default_ref_list[j][i]));
202  }
203  }
204  }
205  }
206 
207  return 0;
208 }
209 
210 static void print_short_term(H264Context *h);
211 static void print_long_term(H264Context *h);
212 
213 /**
214  * Extract structure information about the picture described by pic_num in
215  * the current decoding context (frame or field). Note that pic_num is
216  * picture number without wrapping (so, 0<=pic_num<max_pic_num).
217  * @param pic_num picture number for which to extract structure information
218  * @param structure one of PICT_XXX describing structure of picture
219  * with pic_num
220  * @return frame number (short term) or long term index of picture
221  * described by pic_num
222  */
223 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
224 {
225  *structure = h->picture_structure;
226  if (FIELD_PICTURE(h)) {
227  if (!(pic_num & 1))
228  /* opposite field */
229  *structure ^= PICT_FRAME;
230  pic_num >>= 1;
231  }
232 
233  return pic_num;
234 }
235 
237 {
238  int list, index, pic_structure;
239 
240  print_short_term(h);
241  print_long_term(h);
242 
243  for (list = 0; list < sl->list_count; list++) {
244  memcpy(sl->ref_list[list], h->default_ref_list[list], sl->ref_count[list] * sizeof(sl->ref_list[0][0]));
245 
246  if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
247  int pred = h->curr_pic_num;
248 
249  for (index = 0; ; index++) {
250  unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
251  unsigned int pic_id;
252  int i;
253  H264Picture *ref = NULL;
254 
255  if (modification_of_pic_nums_idc == 3)
256  break;
257 
258  if (index >= sl->ref_count[list]) {
259  av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
260  return -1;
261  }
262 
263  switch (modification_of_pic_nums_idc) {
264  case 0:
265  case 1: {
266  const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
267  int frame_num;
268 
269  if (abs_diff_pic_num > h->max_pic_num) {
271  "abs_diff_pic_num overflow\n");
272  return AVERROR_INVALIDDATA;
273  }
274 
275  if (modification_of_pic_nums_idc == 0)
276  pred -= abs_diff_pic_num;
277  else
278  pred += abs_diff_pic_num;
279  pred &= h->max_pic_num - 1;
280 
281  frame_num = pic_num_extract(h, pred, &pic_structure);
282 
283  for (i = h->short_ref_count - 1; i >= 0; i--) {
284  ref = h->short_ref[i];
285  assert(ref->reference);
286  assert(!ref->long_ref);
287  if (ref->frame_num == frame_num &&
288  (ref->reference & pic_structure))
289  break;
290  }
291  if (i >= 0)
292  ref->pic_id = pred;
293  break;
294  }
295  case 2: {
296  int long_idx;
297  pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
298 
299  long_idx = pic_num_extract(h, pic_id, &pic_structure);
300 
301  if (long_idx > 31) {
303  "long_term_pic_idx overflow\n");
304  return AVERROR_INVALIDDATA;
305  }
306  ref = h->long_ref[long_idx];
307  assert(!(ref && !ref->reference));
308  if (ref && (ref->reference & pic_structure)) {
309  ref->pic_id = pic_id;
310  assert(ref->long_ref);
311  i = 0;
312  } else {
313  i = -1;
314  }
315  break;
316  }
317  default:
319  "illegal modification_of_pic_nums_idc %u\n",
320  modification_of_pic_nums_idc);
321  return AVERROR_INVALIDDATA;
322  }
323 
324  if (i < 0) {
326  "reference picture missing during reorder\n");
327  memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
328  } else {
329  for (i = index; i + 1 < sl->ref_count[list]; i++) {
330  if (sl->ref_list[list][i].parent &&
331  ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
332  ref->pic_id == sl->ref_list[list][i].pic_id)
333  break;
334  }
335  for (; i > index; i--) {
336  sl->ref_list[list][i] = sl->ref_list[list][i - 1];
337  }
338  ref_from_h264pic(&sl->ref_list[list][index], ref);
339  if (FIELD_PICTURE(h)) {
340  pic_as_field(&sl->ref_list[list][index], pic_structure);
341  }
342  }
343  }
344  }
345  }
346  for (list = 0; list < sl->list_count; list++) {
347  for (index = 0; index < sl->ref_count[list]; index++) {
348  if ( !sl->ref_list[list][index].parent
349  || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
350  int i;
351  av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc);
352  for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
353  h->last_pocs[i] = INT_MIN;
354  if (h->default_ref_list[list][0].parent
355  && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3))
356  sl->ref_list[list][index] = h->default_ref_list[list][0];
357  else
358  return -1;
359  }
360  av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
361  }
362  }
363 
364  return 0;
365 }
366 
368 {
369  int list, i, j;
370  for (list = 0; list < sl->list_count; list++) {
371  for (i = 0; i < sl->ref_count[list]; i++) {
372  H264Ref *frame = &sl->ref_list[list][i];
373  H264Ref *field = &sl->ref_list[list][16 + 2 * i];
374 
375  field[0] = *frame;
376 
377  for (j = 0; j < 3; j++)
378  field[0].linesize[j] <<= 1;
379  field[0].reference = PICT_TOP_FIELD;
380  field[0].poc = field[0].parent->field_poc[0];
381 
382  field[1] = field[0];
383 
384  for (j = 0; j < 3; j++)
385  field[1].data[j] += frame->parent->f->linesize[j];
386  field[1].reference = PICT_BOTTOM_FIELD;
387  field[1].poc = field[1].parent->field_poc[1];
388 
389  sl->luma_weight[16 + 2 * i][list][0] = sl->luma_weight[16 + 2 * i + 1][list][0] = sl->luma_weight[i][list][0];
390  sl->luma_weight[16 + 2 * i][list][1] = sl->luma_weight[16 + 2 * i + 1][list][1] = sl->luma_weight[i][list][1];
391  for (j = 0; j < 2; j++) {
392  sl->chroma_weight[16 + 2 * i][list][j][0] = sl->chroma_weight[16 + 2 * i + 1][list][j][0] = sl->chroma_weight[i][list][j][0];
393  sl->chroma_weight[16 + 2 * i][list][j][1] = sl->chroma_weight[16 + 2 * i + 1][list][j][1] = sl->chroma_weight[i][list][j][1];
394  }
395  }
396  }
397 }
398 
399 /**
400  * Mark a picture as no longer needed for reference. The refmask
401  * argument allows unreferencing of individual fields or the whole frame.
402  * If the picture becomes entirely unreferenced, but is being held for
403  * display purposes, it is marked as such.
404  * @param refmask mask of fields to unreference; the mask is bitwise
405  * anded with the reference marking of pic
406  * @return non-zero if pic becomes entirely unreferenced (except possibly
407  * for display purposes) zero if one of the fields remains in
408  * reference
409  */
410 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
411 {
412  int i;
413  if (pic->reference &= refmask) {
414  return 0;
415  } else {
416  for(i = 0; h->delayed_pic[i]; i++)
417  if(pic == h->delayed_pic[i]){
418  pic->reference = DELAYED_PIC_REF;
419  break;
420  }
421  return 1;
422  }
423 }
424 
425 /**
426  * Find a H264Picture in the short term reference list by frame number.
427  * @param frame_num frame number to search for
428  * @param idx the index into h->short_ref where returned picture is found
429  * undefined if no picture found.
430  * @return pointer to the found picture, or NULL if no pic with the provided
431  * frame number is found
432  */
433 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
434 {
435  int i;
436 
437  for (i = 0; i < h->short_ref_count; i++) {
438  H264Picture *pic = h->short_ref[i];
439  if (h->avctx->debug & FF_DEBUG_MMCO)
440  av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
441  if (pic->frame_num == frame_num) {
442  *idx = i;
443  return pic;
444  }
445  }
446  return NULL;
447 }
448 
449 /**
450  * Remove a picture from the short term reference list by its index in
451  * that list. This does no checking on the provided index; it is assumed
452  * to be valid. Other list entries are shifted down.
453  * @param i index into h->short_ref of picture to remove.
454  */
455 static void remove_short_at_index(H264Context *h, int i)
456 {
457  assert(i >= 0 && i < h->short_ref_count);
458  h->short_ref[i] = NULL;
459  if (--h->short_ref_count)
460  memmove(&h->short_ref[i], &h->short_ref[i + 1],
461  (h->short_ref_count - i) * sizeof(H264Picture*));
462 }
463 
464 /**
465  *
466  * @return the removed picture or NULL if an error occurs
467  */
468 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
469 {
470  H264Picture *pic;
471  int i;
472 
473  if (h->avctx->debug & FF_DEBUG_MMCO)
474  av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
475 
476  pic = find_short(h, frame_num, &i);
477  if (pic) {
478  if (unreference_pic(h, pic, ref_mask))
479  remove_short_at_index(h, i);
480  }
481 
482  return pic;
483 }
484 
485 /**
486  * Remove a picture from the long term reference list by its index in
487  * that list.
488  * @return the removed picture or NULL if an error occurs
489  */
490 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
491 {
492  H264Picture *pic;
493 
494  pic = h->long_ref[i];
495  if (pic) {
496  if (unreference_pic(h, pic, ref_mask)) {
497  assert(h->long_ref[i]->long_ref == 1);
498  h->long_ref[i]->long_ref = 0;
499  h->long_ref[i] = NULL;
500  h->long_ref_count--;
501  }
502  }
503 
504  return pic;
505 }
506 
508 {
509  int i;
510 
511  for (i = 0; i < 16; i++) {
512  remove_long(h, i, 0);
513  }
514  assert(h->long_ref_count == 0);
515 
516  if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
519  }
520 
521  for (i = 0; i < h->short_ref_count; i++) {
522  unreference_pic(h, h->short_ref[i], 0);
523  h->short_ref[i] = NULL;
524  }
525  h->short_ref_count = 0;
526 
527  memset(h->default_ref_list, 0, sizeof(h->default_ref_list));
528  for (i = 0; i < h->nb_slice_ctx; i++) {
529  H264SliceContext *sl = &h->slice_ctx[i];
530  sl->list_count = sl->ref_count[0] = sl->ref_count[1] = 0;
531  memset(sl->ref_list, 0, sizeof(sl->ref_list));
532  }
533 }
534 
535 /**
536  * print short term list
537  */
539 {
540  uint32_t i;
541  if (h->avctx->debug & FF_DEBUG_MMCO) {
542  av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
543  for (i = 0; i < h->short_ref_count; i++) {
544  H264Picture *pic = h->short_ref[i];
545  av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
546  i, pic->frame_num, pic->poc, pic->f->data[0]);
547  }
548  }
549 }
550 
551 /**
552  * print long term list
553  */
555 {
556  uint32_t i;
557  if (h->avctx->debug & FF_DEBUG_MMCO) {
558  av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
559  for (i = 0; i < 16; i++) {
560  H264Picture *pic = h->long_ref[i];
561  if (pic) {
562  av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
563  i, pic->frame_num, pic->poc, pic->f->data[0]);
564  }
565  }
566  }
567 }
568 
569 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
570 {
571  int i;
572 
573  for (i = 0; i < n_mmcos; i++) {
574  if (mmco1[i].opcode != mmco2[i].opcode) {
575  av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n",
576  mmco1[i].opcode, mmco2[i].opcode, i);
577  return -1;
578  }
579  }
580 
581  return 0;
582 }
583 
585 {
586  MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
587  int mmco_index = 0, i = 0;
588 
589  if (h->short_ref_count &&
591  !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
592  mmco[0].opcode = MMCO_SHORT2UNUSED;
593  mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
594  mmco_index = 1;
595  if (FIELD_PICTURE(h)) {
596  mmco[0].short_pic_num *= 2;
597  mmco[1].opcode = MMCO_SHORT2UNUSED;
598  mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
599  mmco_index = 2;
600  }
601  }
602 
603  if (first_slice) {
604  h->mmco_index = mmco_index;
605  } else if (!first_slice && mmco_index >= 0 &&
606  (mmco_index != h->mmco_index ||
607  (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
609  "Inconsistent MMCO state between slices [%d, %d]\n",
610  mmco_index, h->mmco_index);
611  return AVERROR_INVALIDDATA;
612  }
613  return 0;
614 }
615 
616 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
617 {
618  int i, av_uninit(j);
619  int pps_count;
620  int pps_ref_count[2] = {0};
621  int current_ref_assigned = 0, err = 0;
622  H264Picture *av_uninit(pic);
623 
624  if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
625  av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
626 
627  for (i = 0; i < mmco_count; i++) {
628  int av_uninit(structure), av_uninit(frame_num);
629  if (h->avctx->debug & FF_DEBUG_MMCO)
630  av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
631  h->mmco[i].short_pic_num, h->mmco[i].long_arg);
632 
633  if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
634  mmco[i].opcode == MMCO_SHORT2LONG) {
635  frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
636  pic = find_short(h, frame_num, &j);
637  if (!pic) {
638  if (mmco[i].opcode != MMCO_SHORT2LONG ||
639  !h->long_ref[mmco[i].long_arg] ||
640  h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
641  av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
642  err = AVERROR_INVALIDDATA;
643  }
644  continue;
645  }
646  }
647 
648  switch (mmco[i].opcode) {
649  case MMCO_SHORT2UNUSED:
650  if (h->avctx->debug & FF_DEBUG_MMCO)
651  av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
653  remove_short(h, frame_num, structure ^ PICT_FRAME);
654  break;
655  case MMCO_SHORT2LONG:
656  if (h->long_ref[mmco[i].long_arg] != pic)
657  remove_long(h, mmco[i].long_arg, 0);
658 
659  remove_short_at_index(h, j);
660  h->long_ref[ mmco[i].long_arg ] = pic;
661  if (h->long_ref[mmco[i].long_arg]) {
662  h->long_ref[mmco[i].long_arg]->long_ref = 1;
663  h->long_ref_count++;
664  }
665  break;
666  case MMCO_LONG2UNUSED:
667  j = pic_num_extract(h, mmco[i].long_arg, &structure);
668  pic = h->long_ref[j];
669  if (pic) {
670  remove_long(h, j, structure ^ PICT_FRAME);
671  } else if (h->avctx->debug & FF_DEBUG_MMCO)
672  av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
673  break;
674  case MMCO_LONG:
675  // Comment below left from previous code as it is an interresting note.
676  /* First field in pair is in short term list or
677  * at a different long term index.
678  * This is not allowed; see 7.4.3.3, notes 2 and 3.
679  * Report the problem and keep the pair where it is,
680  * and mark this field valid.
681  */
682  if (h->short_ref[0] == h->cur_pic_ptr) {
683  av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
684  remove_short_at_index(h, 0);
685  }
686 
687  /* make sure the current picture is not already assigned as a long ref */
688  if (h->cur_pic_ptr->long_ref) {
689  for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
690  if (h->long_ref[j] == h->cur_pic_ptr) {
691  if (j != mmco[i].long_arg)
692  av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
693  remove_long(h, j, 0);
694  }
695  }
696  }
697 
698  if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
700  remove_long(h, mmco[i].long_arg, 0);
701 
702  h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
703  h->long_ref[mmco[i].long_arg]->long_ref = 1;
704  h->long_ref_count++;
705  }
706 
708  current_ref_assigned = 1;
709  break;
710  case MMCO_SET_MAX_LONG:
711  assert(mmco[i].long_arg <= 16);
712  // just remove the long term which index is greater than new max
713  for (j = mmco[i].long_arg; j < 16; j++) {
714  remove_long(h, j, 0);
715  }
716  break;
717  case MMCO_RESET:
718  while (h->short_ref_count) {
719  remove_short(h, h->short_ref[0]->frame_num, 0);
720  }
721  for (j = 0; j < 16; j++) {
722  remove_long(h, j, 0);
723  }
724  h->frame_num = h->cur_pic_ptr->frame_num = 0;
725  h->mmco_reset = 1;
726  h->cur_pic_ptr->mmco_reset = 1;
727  for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
728  h->last_pocs[j] = INT_MIN;
729  break;
730  default: assert(0);
731  }
732  }
733 
734  if (!current_ref_assigned) {
735  /* Second field of complementary field pair; the first field of
736  * which is already referenced. If short referenced, it
737  * should be first entry in short_ref. If not, it must exist
738  * in long_ref; trying to put it on the short list here is an
739  * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
740  */
741  if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
742  /* Just mark the second field valid */
744  } else if (h->cur_pic_ptr->long_ref) {
745  av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
746  "assignment for second field "
747  "in complementary field pair "
748  "(first field is long term)\n");
749  err = AVERROR_INVALIDDATA;
750  } else {
751  pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
752  if (pic) {
753  av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
754  err = AVERROR_INVALIDDATA;
755  }
756 
757  if (h->short_ref_count)
758  memmove(&h->short_ref[1], &h->short_ref[0],
759  h->short_ref_count * sizeof(H264Picture*));
760 
761  h->short_ref[0] = h->cur_pic_ptr;
762  h->short_ref_count++;
764  }
765  }
766 
767  if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) {
768 
769  /* We have too many reference frames, probably due to corrupted
770  * stream. Need to discard one frame. Prevents overrun of the
771  * short_ref and long_ref buffers.
772  */
774  "number of reference frames (%d+%d) exceeds max (%d; probably "
775  "corrupt input), discarding one\n",
777  err = AVERROR_INVALIDDATA;
778 
779  if (h->long_ref_count && !h->short_ref_count) {
780  for (i = 0; i < 16; ++i)
781  if (h->long_ref[i])
782  break;
783 
784  assert(i < 16);
785  remove_long(h, i, 0);
786  } else {
787  pic = h->short_ref[h->short_ref_count - 1];
788  remove_short(h, pic->frame_num, 0);
789  }
790  }
791 
792  for (i = 0; i<h->short_ref_count; i++) {
793  pic = h->short_ref[i];
794  if (pic->invalid_gap) {
795  int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->sps.log2_max_frame_num);
796  if (d > h->sps.ref_frame_count)
797  remove_short(h, pic->frame_num, 0);
798  }
799  }
800 
801  print_short_term(h);
802  print_long_term(h);
803 
804  pps_count = 0;
805  for (i = 0; i < FF_ARRAY_ELEMS(h->pps_buffers); i++) {
806  pps_count += !!h->pps_buffers[i];
807  pps_ref_count[0] = FFMAX(pps_ref_count[0], h->pps.ref_count[0]);
808  pps_ref_count[1] = FFMAX(pps_ref_count[1], h->pps.ref_count[1]);
809  }
810 
811  if ( err >= 0
812  && h->long_ref_count==0
813  && ( h->short_ref_count<=2
814  || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
815  && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
817  h->cur_pic_ptr->recovered |= 1;
818  if(!h->avctx->has_b_frames)
820  }
821 
822  return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
823 }
824 
826  int first_slice)
827 {
828  int i, ret;
829  MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = mmco_temp;
830  int mmco_index = 0;
831 
832  if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
833  skip_bits1(gb); // broken_link
834  if (get_bits1(gb)) {
835  mmco[0].opcode = MMCO_LONG;
836  mmco[0].long_arg = 0;
837  mmco_index = 1;
838  }
839  } else {
840  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
841  for (i = 0; i < MAX_MMCO_COUNT; i++) {
842  MMCOOpcode opcode = get_ue_golomb_31(gb);
843 
844  mmco[i].opcode = opcode;
845  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
846  mmco[i].short_pic_num =
847  (h->curr_pic_num - get_ue_golomb(gb) - 1) &
848  (h->max_pic_num - 1);
849 #if 0
850  if (mmco[i].short_pic_num >= h->short_ref_count ||
851  !h->short_ref[mmco[i].short_pic_num]) {
852  av_log(s->avctx, AV_LOG_ERROR,
853  "illegal short ref in memory management control "
854  "operation %d\n", mmco);
855  return -1;
856  }
857 #endif
858  }
859  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
860  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
861  unsigned int long_arg = get_ue_golomb_31(gb);
862  if (long_arg >= 32 ||
863  (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
864  long_arg == 16) &&
865  !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
867  "illegal long ref in memory management control "
868  "operation %d\n", opcode);
869  return -1;
870  }
871  mmco[i].long_arg = long_arg;
872  }
873 
874  if (opcode > (unsigned) MMCO_LONG) {
876  "illegal memory management control operation %d\n",
877  opcode);
878  return -1;
879  }
880  if (opcode == MMCO_END)
881  break;
882  }
883  mmco_index = i;
884  } else {
885  if (first_slice) {
886  ret = ff_generate_sliding_window_mmcos(h, first_slice);
887  if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
888  return ret;
889  }
890  mmco_index = -1;
891  }
892  }
893 
894  if (first_slice && mmco_index != -1) {
895  memcpy(h->mmco, mmco_temp, sizeof(h->mmco));
896  h->mmco_index = mmco_index;
897  } else if (!first_slice && mmco_index >= 0 &&
898  (mmco_index != h->mmco_index ||
899  check_opcodes(h->mmco, mmco_temp, mmco_index))) {
901  "Inconsistent MMCO state between slices [%d, %d]\n",
902  mmco_index, h->mmco_index);
903  return AVERROR_INVALIDDATA;
904  }
905 
906  return 0;
907 }
static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
Definition: h264_refs.c:61
int ff_h264_fill_default_ref_list(H264Context *h, H264SliceContext *sl)
Fill the default_ref_list.
Definition: h264_refs.c:125
#define ff_tlog(ctx,...)
Definition: internal.h:54
void ff_h264_unref_picture(H264Context *h, H264Picture *pic)
Definition: h264_picture.c:47
#define NULL
Definition: coverity.c:32
Memory management control operation.
Definition: h264.h:303
static int pic_num_extract(H264Context *h, int pic_num, int *structure)
Extract structure information about the picture described by pic_num in the current decoding context ...
Definition: h264_refs.c:223
static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir)
Definition: h264_refs.c:103
int long_ref
1->long term reference 0->short term reference
Definition: h264.h:335
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
void ff_h264_fill_mbaff_ref_list(H264Context *h, H264SliceContext *sl)
Definition: h264_refs.c:367
static H264Picture * remove_short(H264Context *h, int frame_num, int ref_mask)
Definition: h264_refs.c:468
int luma_weight[48][2][2]
Definition: h264.h:390
int first_field
Definition: h264.h:591
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:441
static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
Definition: h264_refs.c:569
#define FF_DEBUG_MMCO
Definition: avcodec.h:2861
MMCO mmco[MAX_MMCO_COUNT]
memory management control operations buffer.
Definition: h264.h:678
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:243
#define DELAYED_PIC_REF
Value of Picture.reference when Picture is not a reference picture, but is held for delayed output...
Definition: diracdec.c:74
H264Picture * delayed_pic[MAX_DELAYED_PIC_COUNT+2]
Definition: h264.h:670
int mmco_index
Definition: h264.h:679
MMCOOpcode
Memory management control operation opcode.
Definition: h264.h:290
H264Context.
Definition: h264.h:517
AVFrame * f
Definition: h264.h:310
H264Picture * long_ref[32]
Definition: h264.h:669
int picture_structure
Definition: h264.h:590
H264Ref default_ref_list[2][32]
base reference list for all slices of a coded picture
Definition: h264.h:667
MMCOOpcode opcode
Definition: h264.h:304
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:460
void ff_h264_remove_all_refs(H264Context *h)
Definition: h264_refs.c:507
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int short_pic_num
pic_num without wrapping (pic_num & max_pic_num)
Definition: h264.h:305
Definition: h264.h:351
int poc
Definition: h264.h:356
int poc
frame POC
Definition: h264.h:329
int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb, int first_slice)
Definition: h264_refs.c:825
static AVFrame * frame
int frame_recovered
Initial frame has been completely recovered.
Definition: h264.h:804
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:34
#define MAX_DELAYED_PIC_COUNT
Definition: h264.h:54
H264Picture * parent
Definition: h264.h:359
int recovered
picture at IDR or recovery point + recovery count
Definition: h264.h:342
int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
Definition: h264_refs.c:584
#define av_log(a,...)
int last_pocs[MAX_DELAYED_PIC_COUNT]
Definition: h264.h:671
H.264 / AVC / MPEG4 part10 codec.
int frame_num
Definition: h264.h:650
int width
width and height of the video frame
Definition: frame.h:220
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1812
static int get_ue_golomb(GetBitContext *gb)
read unsigned exp golomb code.
Definition: golomb.h:53
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2901
int nal_unit_type
Definition: h264.h:627
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
PPS pps
current pps
Definition: h264.h:577
simple assert() macros that are a bit more flexible than ISO C assert().
#define PICT_TOP_FIELD
Definition: mpegutils.h:33
static int build_def_list(H264Ref *def, int def_len, H264Picture **in, int len, int is_long, int sel)
Definition: h264_refs.c:77
int frame_num
frame_num (raw frame_num from slice header)
Definition: h264.h:330
#define FFMAX(a, b)
Definition: common.h:79
Libavcodec external API header.
int slice_type_nos
S free slice type (SI/SP are remapped to I/P)
Definition: h264.h:369
int pic_id
Definition: h264.h:357
static int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
Mark a picture as no longer needed for reference.
Definition: h264_refs.c:410
uint8_t * data[3]
Definition: h264.h:352
int ref_frame_count
num_ref_frames
Definition: h264.h:187
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2890
int reference
Definition: h264.h:341
#define FIELD_PICTURE(h)
Definition: h264.h:74
int nb_slice_ctx
Definition: h264.h:532
int long_ref_count
number of actual long term references
Definition: h264.h:682
int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src)
Definition: h264_picture.c:68
SPS sps
current sps
Definition: h264.h:576
PPS * pps_buffers[MAX_PPS_COUNT]
Definition: h264.h:639
mcdeint parity
Definition: vf_mcdeint.c:275
int mmco_reset
Definition: h264.h:680
H264SliceContext * slice_ctx
Definition: h264.h:531
int reference
Definition: h264.h:355
int max_pic_num
max_frame_num or 2 * max_frame_num for field pics.
Definition: h264.h:665
int curr_pic_num
frame_num for frames or 2 * frame_num + 1 for field pics.
Definition: h264.h:660
static void remove_short_at_index(H264Context *h, int i)
Remove a picture from the short term reference list by its index in that list.
Definition: h264_refs.c:455
static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
Definition: h264_refs.c:51
#define FF_ARRAY_ELEMS(a)
static H264Picture * find_short(H264Context *h, int frame_num, int *idx)
Find a H264Picture in the short term reference list by frame number.
Definition: h264_refs.c:433
static const float pred[4]
Definition: siprdata.h:259
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:232
AVCodecContext * avctx
Definition: h264.h:519
int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
Execute the reference picture marking (memory management control operations).
Definition: h264_refs.c:616
AVS_Value src
Definition: avisynth_c.h:482
static int get_ue_golomb_31(GetBitContext *gb)
read unsigned exp golomb code, constraint to a max of 31.
Definition: golomb.h:100
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
H264Picture * short_ref[32]
Definition: h264.h:668
int field_poc[2]
top/bottom POC
Definition: h264.h:328
int debug
debug
Definition: avcodec.h:2842
Definition: h264.h:291
int av_buffer_get_ref_count(const AVBufferRef *buf)
Definition: buffer.c:145
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
AVBuffer * buffer
Definition: buffer.h:82
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
int index
Definition: gxfenc.c:89
#define MAX_MMCO_COUNT
Definition: h264.h:52
int mmco_reset
MMCO_RESET set this 1.
Definition: h264.h:331
static H264Picture * remove_long(H264Context *h, int i, int ref_mask)
Remove a picture from the long term reference list by its index in that list.
Definition: h264_refs.c:490
H264Picture * cur_pic_ptr
Definition: h264.h:527
int linesize[3]
Definition: h264.h:353
unsigned int list_count
Definition: h264.h:461
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
int has_recovery_point
Definition: h264.h:806
int pic_id
pic_num (short -> no wrap version of pic_num, pic_num & max_pic_num; long -> long_pic_num) ...
Definition: h264.h:333
static void pic_as_field(H264Ref *pic, const int parity)
Definition: h264_refs.c:39
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:280
#define FRAME_RECOVERED_SEI
Sufficient number of frames have been decoded since a SEI recovery point, so all the following frames...
Definition: h264.h:802
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264.h:180
Bi-dir predicted.
Definition: avutil.h:268
int long_arg
index, pic_num, or num long refs depending on opcode
Definition: h264.h:306
#define PICT_FRAME
Definition: mpegutils.h:35
int len
int chroma_weight[48][2][2][2]
Definition: h264.h:391
static void print_long_term(H264Context *h)
print long term list
Definition: h264_refs.c:554
int ff_h264_decode_ref_pic_list_reordering(H264Context *h, H264SliceContext *sl)
Definition: h264_refs.c:236
H264Ref ref_list[2][48]
0..15: frame refs, 16..47: mbaff field refs.
Definition: h264.h:462
H264Picture last_pic_for_ec
Definition: h264.h:529
#define av_uninit(x)
Definition: attributes.h:141
int height
Definition: frame.h:220
#define FFSWAP(type, a, b)
Definition: common.h:84
exp golomb vlc stuff
static void print_short_term(H264Context *h)
print short term list
Definition: h264_refs.c:538
GetBitContext gb
Definition: h264.h:364
for(j=16;j >0;--j)
int short_ref_count
number of actual short term references
Definition: h264.h:683