FFmpeg
cbs.c
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include <string.h>
20 
21 #include "config.h"
22 
23 #include "libavutil/avassert.h"
24 #include "libavutil/buffer.h"
25 #include "libavutil/common.h"
26 #include "libavutil/opt.h"
27 
28 #include "avcodec.h"
29 #include "cbs.h"
30 #include "cbs_internal.h"
31 
32 
33 static const CodedBitstreamType *const cbs_type_table[] = {
34 #if CONFIG_CBS_AV1
36 #endif
37 #if CONFIG_CBS_H264
39 #endif
40 #if CONFIG_CBS_H265
42 #endif
43 #if CONFIG_CBS_JPEG
45 #endif
46 #if CONFIG_CBS_MPEG2
48 #endif
49 #if CONFIG_CBS_VP9
51 #endif
52 };
53 
55 #if CONFIG_CBS_AV1
57 #endif
58 #if CONFIG_CBS_H264
60 #endif
61 #if CONFIG_CBS_H265
63 #endif
64 #if CONFIG_CBS_JPEG
66 #endif
67 #if CONFIG_CBS_MPEG2
69 #endif
70 #if CONFIG_CBS_VP9
72 #endif
74 };
75 
77  enum AVCodecID codec_id, void *log_ctx)
78 {
80  const CodedBitstreamType *type;
81  int i;
82 
83  type = NULL;
84  for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
85  if (cbs_type_table[i]->codec_id == codec_id) {
87  break;
88  }
89  }
90  if (!type)
91  return AVERROR(EINVAL);
92 
93  ctx = av_mallocz(sizeof(*ctx));
94  if (!ctx)
95  return AVERROR(ENOMEM);
96 
97  ctx->log_ctx = log_ctx;
98  ctx->codec = type; /* Must be before any error */
99 
100  if (type->priv_data_size) {
101  ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
102  if (!ctx->priv_data) {
103  av_freep(&ctx);
104  return AVERROR(ENOMEM);
105  }
106  if (type->priv_class) {
107  *(const AVClass **)ctx->priv_data = type->priv_class;
109  }
110  }
111 
112  ctx->decompose_unit_types = NULL;
113 
114  ctx->trace_enable = 0;
115  ctx->trace_level = AV_LOG_TRACE;
116 
117  *ctx_ptr = ctx;
118  return 0;
119 }
120 
122 {
123  if (ctx->codec->flush)
124  ctx->codec->flush(ctx);
125 }
126 
128 {
129  CodedBitstreamContext *ctx = *ctx_ptr;
130 
131  if (!ctx)
132  return;
133 
134  if (ctx->codec->close)
135  ctx->codec->close(ctx);
136 
137  av_freep(&ctx->write_buffer);
138 
139  if (ctx->codec->priv_class && ctx->priv_data)
141 
143  av_freep(ctx_ptr);
144 }
145 
147 {
149  unit->content = NULL;
150 
151  av_buffer_unref(&unit->data_ref);
152  unit->data = NULL;
153  unit->data_size = 0;
154  unit->data_bit_padding = 0;
155 }
156 
158 {
159  int i;
160 
161  for (i = 0; i < frag->nb_units; i++)
162  cbs_unit_uninit(&frag->units[i]);
163  frag->nb_units = 0;
164 
165  av_buffer_unref(&frag->data_ref);
166  frag->data = NULL;
167  frag->data_size = 0;
168  frag->data_bit_padding = 0;
169 }
170 
172 {
173  ff_cbs_fragment_reset(frag);
174 
175  av_freep(&frag->units);
176  frag->nb_units_allocated = 0;
177 }
178 
181 {
182  int err, i, j;
183 
184  for (i = 0; i < frag->nb_units; i++) {
185  CodedBitstreamUnit *unit = &frag->units[i];
186 
187  if (ctx->decompose_unit_types) {
188  for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
189  if (ctx->decompose_unit_types[j] == unit->type)
190  break;
191  }
192  if (j >= ctx->nb_decompose_unit_types)
193  continue;
194  }
195 
197  unit->content = NULL;
198 
199  av_assert0(unit->data && unit->data_ref);
200 
201  err = ctx->codec->read_unit(ctx, unit);
202  if (err == AVERROR(ENOSYS)) {
203  av_log(ctx->log_ctx, AV_LOG_VERBOSE,
204  "Decomposition unimplemented for unit %d "
205  "(type %"PRIu32").\n", i, unit->type);
206  } else if (err == AVERROR(EAGAIN)) {
207  av_log(ctx->log_ctx, AV_LOG_VERBOSE,
208  "Skipping decomposition of unit %d "
209  "(type %"PRIu32").\n", i, unit->type);
211  unit->content = NULL;
212  } else if (err < 0) {
213  av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
214  "(type %"PRIu32").\n", i, unit->type);
215  return err;
216  }
217  }
218 
219  return 0;
220 }
221 
223  const uint8_t *data, size_t size)
224 {
225  av_assert0(!frag->data && !frag->data_ref);
226 
227  frag->data_ref =
229  if (!frag->data_ref)
230  return AVERROR(ENOMEM);
231 
232  frag->data = frag->data_ref->data;
233  frag->data_size = size;
234 
235  memcpy(frag->data, data, size);
236  memset(frag->data + size, 0,
238 
239  return 0;
240 }
241 
244  AVBufferRef *buf,
245  const uint8_t *data, size_t size,
246  int header)
247 {
248  int err;
249 
250  if (buf) {
251  frag->data_ref = av_buffer_ref(buf);
252  if (!frag->data_ref)
253  return AVERROR(ENOMEM);
254 
255  frag->data = (uint8_t *)data;
256  frag->data_size = size;
257 
258  } else {
259  err = cbs_fill_fragment_data(frag, data, size);
260  if (err < 0)
261  return err;
262  }
263 
264  err = ctx->codec->split_fragment(ctx, frag, header);
265  if (err < 0)
266  return err;
267 
268  return cbs_read_fragment_content(ctx, frag);
269 }
270 
273  const AVCodecParameters *par)
274 {
275  return cbs_read_data(ctx, frag, NULL,
276  par->extradata,
277  par->extradata_size, 1);
278 }
279 
282  const AVCodecContext *avctx)
283 {
284  return cbs_read_data(ctx, frag, NULL,
285  avctx->extradata,
286  avctx->extradata_size, 1);
287 }
288 
291  const AVPacket *pkt)
292 {
293  return cbs_read_data(ctx, frag, pkt->buf,
294  pkt->data, pkt->size, 0);
295 }
296 
299  const AVPacket *pkt)
300 {
301  size_t side_data_size;
302  const uint8_t *side_data =
304  &side_data_size);
305 
306  return cbs_read_data(ctx, frag, NULL,
307  side_data, side_data_size, 1);
308 }
309 
312  const uint8_t *data, size_t size)
313 {
314  return cbs_read_data(ctx, frag, NULL,
315  data, size, 0);
316 }
317 
318 /**
319  * Allocate a new internal data buffer of the given size in the unit.
320  *
321  * The data buffer will have input padding.
322  */
324  size_t size)
325 {
326  av_assert0(!unit->data && !unit->data_ref);
327 
329  if (!unit->data_ref)
330  return AVERROR(ENOMEM);
331 
332  unit->data = unit->data_ref->data;
333  unit->data_size = size;
334 
335  memset(unit->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
336 
337  return 0;
338 }
339 
341  CodedBitstreamUnit *unit)
342 {
343  PutBitContext pbc;
344  int ret;
345 
346  if (!ctx->write_buffer) {
347  // Initial write buffer size is 1MB.
348  ctx->write_buffer_size = 1024 * 1024;
349 
350  reallocate_and_try_again:
351  ret = av_reallocp(&ctx->write_buffer, ctx->write_buffer_size);
352  if (ret < 0) {
353  av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
354  "sufficiently large write buffer (last attempt "
355  "%"SIZE_SPECIFIER" bytes).\n", ctx->write_buffer_size);
356  return ret;
357  }
358  }
359 
360  init_put_bits(&pbc, ctx->write_buffer, ctx->write_buffer_size);
361 
362  ret = ctx->codec->write_unit(ctx, unit, &pbc);
363  if (ret < 0) {
364  if (ret == AVERROR(ENOSPC)) {
365  // Overflow.
366  if (ctx->write_buffer_size == INT_MAX / 8)
367  return AVERROR(ENOMEM);
368  ctx->write_buffer_size = FFMIN(2 * ctx->write_buffer_size, INT_MAX / 8);
369  goto reallocate_and_try_again;
370  }
371  // Write failed for some other reason.
372  return ret;
373  }
374 
375  // Overflow but we didn't notice.
376  av_assert0(put_bits_count(&pbc) <= 8 * ctx->write_buffer_size);
377 
378  if (put_bits_count(&pbc) % 8)
379  unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
380  else
381  unit->data_bit_padding = 0;
382 
383  flush_put_bits(&pbc);
384 
386  if (ret < 0)
387  return ret;
388 
389  memcpy(unit->data, ctx->write_buffer, unit->data_size);
390 
391  return 0;
392 }
393 
396 {
397  int err, i;
398 
399  for (i = 0; i < frag->nb_units; i++) {
400  CodedBitstreamUnit *unit = &frag->units[i];
401 
402  if (!unit->content)
403  continue;
404 
405  av_buffer_unref(&unit->data_ref);
406  unit->data = NULL;
407 
408  err = cbs_write_unit_data(ctx, unit);
409  if (err < 0) {
410  av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
411  "(type %"PRIu32").\n", i, unit->type);
412  return err;
413  }
414  av_assert0(unit->data && unit->data_ref);
415  }
416 
417  av_buffer_unref(&frag->data_ref);
418  frag->data = NULL;
419 
420  err = ctx->codec->assemble_fragment(ctx, frag);
421  if (err < 0) {
422  av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
423  return err;
424  }
425  av_assert0(frag->data && frag->data_ref);
426 
427  return 0;
428 }
429 
431  AVCodecParameters *par,
433 {
434  int err;
435 
436  err = ff_cbs_write_fragment_data(ctx, frag);
437  if (err < 0)
438  return err;
439 
440  av_freep(&par->extradata);
441 
442  par->extradata = av_malloc(frag->data_size +
444  if (!par->extradata)
445  return AVERROR(ENOMEM);
446 
447  memcpy(par->extradata, frag->data, frag->data_size);
448  memset(par->extradata + frag->data_size, 0,
450  par->extradata_size = frag->data_size;
451 
452  return 0;
453 }
454 
456  AVPacket *pkt,
458 {
459  AVBufferRef *buf;
460  int err;
461 
462  err = ff_cbs_write_fragment_data(ctx, frag);
463  if (err < 0)
464  return err;
465 
466  buf = av_buffer_ref(frag->data_ref);
467  if (!buf)
468  return AVERROR(ENOMEM);
469 
471 
472  pkt->buf = buf;
473  pkt->data = frag->data;
474  pkt->size = frag->data_size;
475 
476  return 0;
477 }
478 
479 
481  const char *name)
482 {
483  if (!ctx->trace_enable)
484  return;
485 
486  av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
487 }
488 
490  const char *str, const int *subscripts,
491  const char *bits, int64_t value)
492 {
493  char name[256];
494  size_t name_len, bits_len;
495  int pad, subs, i, j, k, n;
496 
497  if (!ctx->trace_enable)
498  return;
499 
500  av_assert0(value >= INT_MIN && value <= UINT32_MAX);
501 
502  subs = subscripts ? subscripts[0] : 0;
503  n = 0;
504  for (i = j = 0; str[i];) {
505  if (str[i] == '[') {
506  if (n < subs) {
507  ++n;
508  k = snprintf(name + j, sizeof(name) - j, "[%d", subscripts[n]);
509  av_assert0(k > 0 && j + k < sizeof(name));
510  j += k;
511  for (++i; str[i] && str[i] != ']'; i++);
512  av_assert0(str[i] == ']');
513  } else {
514  while (str[i] && str[i] != ']')
515  name[j++] = str[i++];
516  av_assert0(str[i] == ']');
517  }
518  } else {
519  av_assert0(j + 1 < sizeof(name));
520  name[j++] = str[i++];
521  }
522  }
523  av_assert0(j + 1 < sizeof(name));
524  name[j] = 0;
525  av_assert0(n == subs);
526 
527  name_len = strlen(name);
528  bits_len = strlen(bits);
529 
530  if (name_len + bits_len > 60)
531  pad = bits_len + 2;
532  else
533  pad = 61 - name_len;
534 
535  av_log(ctx->log_ctx, ctx->trace_level, "%-10d %s%*s = %"PRId64"\n",
536  position, name, pad, bits, value);
537 }
538 
540  int width, const char *name,
541  const int *subscripts, uint32_t *write_to,
542  uint32_t range_min, uint32_t range_max)
543 {
544  uint32_t value;
545  int position;
546 
547  av_assert0(width > 0 && width <= 32);
548 
549  if (get_bits_left(gbc) < width) {
550  av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
551  "%s: bitstream ended.\n", name);
552  return AVERROR_INVALIDDATA;
553  }
554 
555  if (ctx->trace_enable)
556  position = get_bits_count(gbc);
557 
558  value = get_bits_long(gbc, width);
559 
560  if (ctx->trace_enable) {
561  char bits[33];
562  int i;
563  for (i = 0; i < width; i++)
564  bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
565  bits[i] = 0;
566 
567  ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
568  bits, value);
569  }
570 
571  if (value < range_min || value > range_max) {
572  av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
573  "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
574  name, value, range_min, range_max);
575  return AVERROR_INVALIDDATA;
576  }
577 
578  *write_to = value;
579  return 0;
580 }
581 
583  int width, const char *name,
584  const int *subscripts, uint32_t value,
585  uint32_t range_min, uint32_t range_max)
586 {
587  av_assert0(width > 0 && width <= 32);
588 
589  if (value < range_min || value > range_max) {
590  av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
591  "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
592  name, value, range_min, range_max);
593  return AVERROR_INVALIDDATA;
594  }
595 
596  if (put_bits_left(pbc) < width)
597  return AVERROR(ENOSPC);
598 
599  if (ctx->trace_enable) {
600  char bits[33];
601  int i;
602  for (i = 0; i < width; i++)
603  bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
604  bits[i] = 0;
605 
607  name, subscripts, bits, value);
608  }
609 
610  if (width < 32)
611  put_bits(pbc, width, value);
612  else
613  put_bits32(pbc, value);
614 
615  return 0;
616 }
617 
619  int width, const char *name,
620  const int *subscripts, int32_t *write_to,
621  int32_t range_min, int32_t range_max)
622 {
623  int32_t value;
624  int position;
625 
626  av_assert0(width > 0 && width <= 32);
627 
628  if (get_bits_left(gbc) < width) {
629  av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
630  "%s: bitstream ended.\n", name);
631  return AVERROR_INVALIDDATA;
632  }
633 
634  if (ctx->trace_enable)
635  position = get_bits_count(gbc);
636 
637  value = get_sbits_long(gbc, width);
638 
639  if (ctx->trace_enable) {
640  char bits[33];
641  int i;
642  for (i = 0; i < width; i++)
643  bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
644  bits[i] = 0;
645 
646  ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
647  bits, value);
648  }
649 
650  if (value < range_min || value > range_max) {
651  av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
652  "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
653  name, value, range_min, range_max);
654  return AVERROR_INVALIDDATA;
655  }
656 
657  *write_to = value;
658  return 0;
659 }
660 
662  int width, const char *name,
663  const int *subscripts, int32_t value,
664  int32_t range_min, int32_t range_max)
665 {
666  av_assert0(width > 0 && width <= 32);
667 
668  if (value < range_min || value > range_max) {
669  av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
670  "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
671  name, value, range_min, range_max);
672  return AVERROR_INVALIDDATA;
673  }
674 
675  if (put_bits_left(pbc) < width)
676  return AVERROR(ENOSPC);
677 
678  if (ctx->trace_enable) {
679  char bits[33];
680  int i;
681  for (i = 0; i < width; i++)
682  bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
683  bits[i] = 0;
684 
686  name, subscripts, bits, value);
687  }
688 
689  if (width < 32)
690  put_sbits(pbc, width, value);
691  else
692  put_bits32(pbc, value);
693 
694  return 0;
695 }
696 
697 
699  int position)
700 {
701  CodedBitstreamUnit *units;
702 
703  if (frag->nb_units < frag->nb_units_allocated) {
704  units = frag->units;
705 
706  if (position < frag->nb_units)
707  memmove(units + position + 1, units + position,
708  (frag->nb_units - position) * sizeof(*units));
709  } else {
710  units = av_malloc_array(frag->nb_units*2 + 1, sizeof(*units));
711  if (!units)
712  return AVERROR(ENOMEM);
713 
714  frag->nb_units_allocated = 2*frag->nb_units_allocated + 1;
715 
716  if (position > 0)
717  memcpy(units, frag->units, position * sizeof(*units));
718 
719  if (position < frag->nb_units)
720  memcpy(units + position + 1, frag->units + position,
721  (frag->nb_units - position) * sizeof(*units));
722  }
723 
724  memset(units + position, 0, sizeof(*units));
725 
726  if (units != frag->units) {
727  av_free(frag->units);
728  frag->units = units;
729  }
730 
731  ++frag->nb_units;
732 
733  return 0;
734 }
735 
737  int position,
739  void *content,
740  AVBufferRef *content_buf)
741 {
742  CodedBitstreamUnit *unit;
743  AVBufferRef *content_ref;
744  int err;
745 
746  if (position == -1)
747  position = frag->nb_units;
748  av_assert0(position >= 0 && position <= frag->nb_units);
749 
750  if (content_buf) {
751  content_ref = av_buffer_ref(content_buf);
752  if (!content_ref)
753  return AVERROR(ENOMEM);
754  } else {
755  content_ref = NULL;
756  }
757 
758  err = cbs_insert_unit(frag, position);
759  if (err < 0) {
760  av_buffer_unref(&content_ref);
761  return err;
762  }
763 
764  unit = &frag->units[position];
765  unit->type = type;
766  unit->content = content;
767  unit->content_ref = content_ref;
768 
769  return 0;
770 }
771 
774  uint8_t *data, size_t data_size,
775  AVBufferRef *data_buf,
776  int position)
777 {
778  CodedBitstreamUnit *unit;
779  AVBufferRef *data_ref;
780  int err;
781 
782  av_assert0(position >= 0 && position <= frag->nb_units);
783 
784  if (data_buf)
785  data_ref = av_buffer_ref(data_buf);
786  else
787  data_ref = av_buffer_create(data, data_size, NULL, NULL, 0);
788  if (!data_ref) {
789  if (!data_buf)
790  av_free(data);
791  return AVERROR(ENOMEM);
792  }
793 
794  err = cbs_insert_unit(frag, position);
795  if (err < 0) {
796  av_buffer_unref(&data_ref);
797  return err;
798  }
799 
800  unit = &frag->units[position];
801  unit->type = type;
802  unit->data = data;
803  unit->data_size = data_size;
804  unit->data_ref = data_ref;
805 
806  return 0;
807 }
808 
811  uint8_t *data, size_t data_size,
812  AVBufferRef *data_buf)
813 {
814  return cbs_insert_unit_data(frag, type,
815  data, data_size, data_buf,
816  frag->nb_units);
817 }
818 
820  int position)
821 {
822  av_assert0(0 <= position && position < frag->nb_units
823  && "Unit to be deleted not in fragment.");
824 
825  cbs_unit_uninit(&frag->units[position]);
826 
827  --frag->nb_units;
828 
829  if (frag->nb_units > 0)
830  memmove(frag->units + position,
831  frag->units + position + 1,
832  (frag->nb_units - position) * sizeof(*frag->units));
833 }
834 
835 static void cbs_default_free_unit_content(void *opaque, uint8_t *data)
836 {
837  const CodedBitstreamUnitTypeDescriptor *desc = opaque;
838  if (desc->content_type == CBS_CONTENT_TYPE_INTERNAL_REFS) {
839  int i;
840  for (i = 0; i < desc->type.ref.nb_offsets; i++) {
841  void **ptr = (void**)(data + desc->type.ref.offsets[i]);
842  av_buffer_unref((AVBufferRef**)(ptr + 1));
843  }
844  }
845  av_free(data);
846 }
847 
850  CodedBitstreamUnit *unit)
851 {
853  int i, j;
854 
855  if (!ctx->codec->unit_types)
856  return NULL;
857 
858  for (i = 0;; i++) {
859  desc = &ctx->codec->unit_types[i];
860  if (desc->nb_unit_types == 0)
861  break;
862  if (desc->nb_unit_types == CBS_UNIT_TYPE_RANGE) {
863  if (unit->type >= desc->unit_type.range.start &&
864  unit->type <= desc->unit_type.range.end)
865  return desc;
866  } else {
867  for (j = 0; j < desc->nb_unit_types; j++) {
868  if (desc->unit_type.list[j] == unit->type)
869  return desc;
870  }
871  }
872  }
873  return NULL;
874 }
875 
877  CodedBitstreamUnit *unit)
878 {
880 
881  av_assert0(!unit->content && !unit->content_ref);
882 
884  if (!desc)
885  return AVERROR(ENOSYS);
886 
887  unit->content = av_mallocz(desc->content_size);
888  if (!unit->content)
889  return AVERROR(ENOMEM);
890 
891  unit->content_ref =
892  av_buffer_create(unit->content, desc->content_size,
893  desc->content_type == CBS_CONTENT_TYPE_COMPLEX
894  ? desc->type.complex.content_free
896  (void*)desc, 0);
897  if (!unit->content_ref) {
898  av_freep(&unit->content);
899  return AVERROR(ENOMEM);
900  }
901 
902  return 0;
903 }
904 
906  const CodedBitstreamUnit *unit,
908 {
909  const uint8_t *src;
910  uint8_t *copy;
911  int err, i;
912 
913  av_assert0(unit->content);
914  src = unit->content;
915 
916  copy = av_memdup(src, desc->content_size);
917  if (!copy)
918  return AVERROR(ENOMEM);
919 
920  for (i = 0; i < desc->type.ref.nb_offsets; i++) {
921  const uint8_t *const *src_ptr = (const uint8_t* const*)(src + desc->type.ref.offsets[i]);
922  const AVBufferRef *src_buf = *(AVBufferRef**)(src_ptr + 1);
923  uint8_t **copy_ptr = (uint8_t**)(copy + desc->type.ref.offsets[i]);
924  AVBufferRef **copy_buf = (AVBufferRef**)(copy_ptr + 1);
925 
926  if (!*src_ptr) {
927  av_assert0(!src_buf);
928  continue;
929  }
930  if (!src_buf) {
931  // We can't handle a non-refcounted pointer here - we don't
932  // have enough information to handle whatever structure lies
933  // at the other end of it.
934  err = AVERROR(EINVAL);
935  goto fail;
936  }
937 
938  *copy_buf = av_buffer_ref(src_buf);
939  if (!*copy_buf) {
940  err = AVERROR(ENOMEM);
941  goto fail;
942  }
943  }
944 
945  *clone_ref = av_buffer_create(copy, desc->content_size,
947  (void*)desc, 0);
948  if (!*clone_ref) {
949  err = AVERROR(ENOMEM);
950  goto fail;
951  }
952 
953  return 0;
954 
955 fail:
956  for (--i; i >= 0; i--)
957  av_buffer_unref((AVBufferRef**)(copy + desc->type.ref.offsets[i]));
958  av_freep(&copy);
959  *clone_ref = NULL;
960  return err;
961 }
962 
963 /*
964  * On success, unit->content and unit->content_ref are updated with
965  * the new content; unit is untouched on failure.
966  * Any old content_ref is simply overwritten and not freed.
967  */
969  CodedBitstreamUnit *unit)
970 {
972  AVBufferRef *ref;
973  int err;
974 
976  if (!desc)
977  return AVERROR(ENOSYS);
978 
979  switch (desc->content_type) {
981  ref = av_buffer_alloc(desc->content_size);
982  if (!ref)
983  return AVERROR(ENOMEM);
984  memcpy(ref->data, unit->content, desc->content_size);
985  err = 0;
986  break;
987 
990  break;
991 
993  if (!desc->type.complex.content_clone)
994  return AVERROR_PATCHWELCOME;
995  err = desc->type.complex.content_clone(&ref, unit);
996  break;
997 
998  default:
999  av_assert0(0 && "Invalid content type.");
1000  }
1001 
1002  if (err < 0)
1003  return err;
1004 
1005  unit->content_ref = ref;
1006  unit->content = ref->data;
1007  return 0;
1008 }
1009 
1011  CodedBitstreamUnit *unit)
1012 {
1013  av_assert0(unit->content);
1014  if (unit->content_ref)
1015  return 0;
1016  return cbs_clone_unit_content(ctx, unit);
1017 }
1018 
1020  CodedBitstreamUnit *unit)
1021 {
1022  AVBufferRef *ref = unit->content_ref;
1023  int err;
1024 
1025  av_assert0(unit->content);
1026  if (ref && av_buffer_is_writable(ref))
1027  return 0;
1028 
1029  err = cbs_clone_unit_content(ctx, unit);
1030  if (err < 0)
1031  return err;
1032  av_buffer_unref(&ref);
1033  return 0;
1034 }
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:75
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:839
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
put_bits32
static void av_unused put_bits32(PutBitContext *s, uint32_t value)
Write exactly 32 bits into a bitstream.
Definition: put_bits.h:291
av_opt_set_defaults
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1459
put_bytes_output
static int put_bytes_output(const PutBitContext *s)
Definition: put_bits.h:89
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:53
ff_cbs_fragment_free
av_cold void ff_cbs_fragment_free(CodedBitstreamFragment *frag)
Free the units array of a fragment in addition to what ff_cbs_fragment_reset does.
Definition: cbs.c:171
AVBufferRef::data
uint8_t * data
The data buffer.
Definition: buffer.h:90
cbs_default_free_unit_content
static void cbs_default_free_unit_content(void *opaque, uint8_t *data)
Definition: cbs.c:835
CBS_CONTENT_TYPE_POD
@ CBS_CONTENT_TYPE_POD
Definition: cbs_internal.h:35
ff_cbs_read_extradata
int ff_cbs_read_extradata(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVCodecParameters *par)
Read the extradata bitstream found in codec parameters into a fragment, then split into units and dec...
Definition: cbs.c:271
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
CodedBitstreamUnit::content
void * content
Pointer to the decomposed form of this unit.
Definition: cbs.h:106
cbs_fill_fragment_data
static int cbs_fill_fragment_data(CodedBitstreamFragment *frag, const uint8_t *data, size_t size)
Definition: cbs.c:222
put_sbits
static void put_sbits(PutBitContext *pb, int n, int32_t value)
Definition: put_bits.h:281
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
ff_cbs_read_packet_side_data
int ff_cbs_read_packet_side_data(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVPacket *pkt)
Definition: cbs.c:297
cbs_read_data
static int cbs_read_data(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, AVBufferRef *buf, const uint8_t *data, size_t size, int header)
Definition: cbs.c:242
cbs_clone_internal_refs_unit_content
static int cbs_clone_internal_refs_unit_content(AVBufferRef **clone_ref, const CodedBitstreamUnit *unit, const CodedBitstreamUnitTypeDescriptor *desc)
Definition: cbs.c:905
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:221
ff_cbs_type_vp9
const CodedBitstreamType ff_cbs_type_vp9
Definition: cbs_vp9.c:648
ff_cbs_fragment_reset
void ff_cbs_fragment_reset(CodedBitstreamFragment *frag)
Free the units contained in a fragment as well as the fragment's own data buffer, but not the units a...
Definition: cbs.c:157
AVPacket::data
uint8_t * data
Definition: packet.h:374
CodedBitstreamContext
Context structure for coded bitstream operations.
Definition: cbs.h:173
data
const char data[16]
Definition: mxf.c:146
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
CodedBitstreamUnit::type
CodedBitstreamUnitType type
Codec-specific type of this unit.
Definition: cbs.h:73
cbs.h
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
CodedBitstreamUnit
Coded bitstream unit structure.
Definition: cbs.h:69
ff_cbs_close
av_cold void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
Close a context and free all internal state.
Definition: cbs.c:127
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
av_memdup
void * av_memdup(const void *p, size_t size)
Duplicate a buffer with av_malloc().
Definition: mem.c:312
ff_cbs_write_unsigned
int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc, int width, const char *name, const int *subscripts, uint32_t value, uint32_t range_min, uint32_t range_max)
Definition: cbs.c:582
ff_cbs_trace_header
void ff_cbs_trace_header(CodedBitstreamContext *ctx, const char *name)
Definition: cbs.c:480
fail
#define fail()
Definition: checkasm.h:131
GetBitContext
Definition: get_bits.h:61
ff_cbs_read
int ff_cbs_read(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const uint8_t *data, size_t size)
Read a bitstream from a memory region into a fragment, then split into units and decompose.
Definition: cbs.c:310
CBS_CONTENT_TYPE_INTERNAL_REFS
@ CBS_CONTENT_TYPE_INTERNAL_REFS
Definition: cbs_internal.h:39
put_bits_left
static int put_bits_left(PutBitContext *s)
Definition: put_bits.h:125
ff_cbs_type_av1
const CodedBitstreamType ff_cbs_type_av1
Definition: cbs_av1.c:1321
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
CodedBitstreamUnit::data
uint8_t * data
Pointer to the directly-parsable bitstream form of this unit.
Definition: cbs.h:80
cbs_write_unit_data
static int cbs_write_unit_data(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
Definition: cbs.c:340
ff_cbs_write_extradata
int ff_cbs_write_extradata(CodedBitstreamContext *ctx, AVCodecParameters *par, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to the extradata in codec parameters.
Definition: cbs.c:430
ff_cbs_make_unit_writable
int ff_cbs_make_unit_writable(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
Make the content of a unit writable so that internal fields can be modified.
Definition: cbs.c:1019
CodedBitstreamFragment::units
CodedBitstreamUnit * units
Pointer to an array of units of length nb_units_allocated.
Definition: cbs.h:167
avassert.h
CodedBitstreamUnitTypeDescriptor
Definition: cbs_internal.h:57
AV_LOG_TRACE
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:206
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
ff_cbs_type_mpeg2
const CodedBitstreamType ff_cbs_type_mpeg2
Definition: cbs_mpeg2.c:416
cbs_unit_uninit
static void cbs_unit_uninit(CodedBitstreamUnit *unit)
Definition: cbs.c:146
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:500
CodedBitstreamFragment
Coded bitstream fragment structure, combining one or more units.
Definition: cbs.h:121
width
#define width
ff_cbs_write_packet
int ff_cbs_write_packet(CodedBitstreamContext *ctx, AVPacket *pkt, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to a packet.
Definition: cbs.c:455
CodedBitstreamFragment::data_size
size_t data_size
The number of bytes in the bitstream.
Definition: cbs.h:134
AV_CODEC_ID_VP9
@ AV_CODEC_ID_VP9
Definition: codec_id.h:218
bits
uint8_t bits
Definition: vp3data.h:141
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
cbs_insert_unit_data
static int cbs_insert_unit_data(CodedBitstreamFragment *frag, CodedBitstreamUnitType type, uint8_t *data, size_t data_size, AVBufferRef *data_buf, int position)
Definition: cbs.c:772
ctx
AVFormatContext * ctx
Definition: movenc.c:48
ff_cbs_append_unit_data
int ff_cbs_append_unit_data(CodedBitstreamFragment *frag, CodedBitstreamUnitType type, uint8_t *data, size_t data_size, AVBufferRef *data_buf)
Add a new unit to a fragment with the given data bitstream.
Definition: cbs.c:809
cbs_internal.h
codec_id
enum AVCodecID codec_id
Definition: vaapi_decode.c:374
CodedBitstreamFragment::data_bit_padding
size_t data_bit_padding
The number of bits which should be ignored in the final byte.
Definition: cbs.h:138
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:77
PutBitContext
Definition: put_bits.h:50
CBS_UNIT_TYPE_RANGE
@ CBS_UNIT_TYPE_RANGE
Definition: cbs_internal.h:54
cbs_type_table
static const CodedBitstreamType *const cbs_type_table[]
Definition: cbs.c:33
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:357
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
AV_CODEC_ID_AV1
@ AV_CODEC_ID_AV1
Definition: codec_id.h:279
ff_cbs_insert_unit_content
int ff_cbs_insert_unit_content(CodedBitstreamFragment *frag, int position, CodedBitstreamUnitType type, void *content, AVBufferRef *content_buf)
Insert a new unit into a fragment with the given content.
Definition: cbs.c:736
ff_cbs_all_codec_ids
enum AVCodecID ff_cbs_all_codec_ids[]
Table of all supported codec IDs.
Definition: cbs.c:54
CodedBitstreamUnit::data_size
size_t data_size
The number of bytes in the bitstream (including any padding bits in the final byte).
Definition: cbs.h:85
cbs_clone_unit_content
static int cbs_clone_unit_content(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
Definition: cbs.c:968
av_opt_free
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1719
cbs_find_unit_type_desc
static const CodedBitstreamUnitTypeDescriptor * cbs_find_unit_type_desc(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
Definition: cbs.c:849
av_buffer_create
AVBufferRef * av_buffer_create(uint8_t *data, size_t size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:55
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:79
AVPacket::size
int size
Definition: packet.h:375
copy
static void copy(const float *p1, float *p2, const int length)
Definition: vf_vaguedenoiser.c:187
size
int size
Definition: twinvq_data.h:10344
CodedBitstreamFragment::data
uint8_t * data
Pointer to the bitstream form of this fragment.
Definition: cbs.h:127
av_reallocp
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
Definition: mem.c:186
CodedBitstreamUnit::data_bit_padding
size_t data_bit_padding
The number of bits which should be ignored in the final byte.
Definition: cbs.h:91
ff_cbs_type_jpeg
const CodedBitstreamType ff_cbs_type_jpeg
Definition: cbs_jpeg.c:435
CBS_CONTENT_TYPE_COMPLEX
@ CBS_CONTENT_TYPE_COMPLEX
Definition: cbs_internal.h:42
header
static const uint8_t header[24]
Definition: sdr2.c:67
buffer.h
ff_cbs_write_signed
int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc, int width, const char *name, const int *subscripts, int32_t value, int32_t range_min, int32_t range_max)
Definition: cbs.c:661
CodedBitstreamType
Definition: cbs_internal.h:100
av_buffer_alloc
AVBufferRef * av_buffer_alloc(size_t size)
Allocate an AVBuffer of the given size using av_malloc().
Definition: buffer.c:77
ff_cbs_read_signed
int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc, int width, const char *name, const int *subscripts, int32_t *write_to, int32_t range_min, int32_t range_max)
Definition: cbs.c:618
ff_cbs_read_extradata_from_codec
int ff_cbs_read_extradata_from_codec(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVCodecContext *avctx)
Definition: cbs.c:280
ff_cbs_trace_syntax_element
void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position, const char *str, const int *subscripts, const char *bits, int64_t value)
Definition: cbs.c:489
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:57
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
CodedBitstreamUnit::data_ref
AVBufferRef * data_ref
A reference to the buffer containing data.
Definition: cbs.h:97
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
put_bits_count
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:80
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:499
av_packet_get_side_data
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, size_t *size)
Get side information from packet.
Definition: avpacket.c:251
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
common.h
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
ff_cbs_make_unit_refcounted
int ff_cbs_make_unit_refcounted(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
Make the content of a unit refcounted.
Definition: cbs.c:1010
ff_cbs_read_unsigned
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc, int width, const char *name, const int *subscripts, uint32_t *write_to, uint32_t range_min, uint32_t range_max)
Definition: cbs.c:539
ff_cbs_write_fragment_data
int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Write the content of the fragment to its own internal buffer.
Definition: cbs.c:394
cbs_insert_unit
static int cbs_insert_unit(CodedBitstreamFragment *frag, int position)
Definition: cbs.c:698
av_buffer_is_writable
int av_buffer_is_writable(const AVBufferRef *buf)
Definition: buffer.c:147
CodedBitstreamFragment::nb_units_allocated
int nb_units_allocated
Number of allocated units.
Definition: cbs.h:159
avcodec.h
CodedBitstreamUnit::content_ref
AVBufferRef * content_ref
If content is reference counted, a reference to the buffer containing content.
Definition: cbs.h:111
ret
ret
Definition: filter_design.txt:187
ff_cbs_alloc_unit_content
int ff_cbs_alloc_unit_content(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
Allocate a new internal content buffer matching the type of the unit.
Definition: cbs.c:876
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
U
#define U(x)
Definition: vpx_arith.h:37
SIZE_SPECIFIER
#define SIZE_SPECIFIER
Definition: internal.h:195
AVCodecContext
main external API structure.
Definition: avcodec.h:398
CodedBitstreamUnitType
uint32_t CodedBitstreamUnitType
The codec-specific type of a bitstream unit.
Definition: cbs.h:46
AV_PKT_DATA_NEW_EXTRADATA
@ AV_PKT_DATA_NEW_EXTRADATA
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: packet.h:56
cbs_alloc_unit_data
static int cbs_alloc_unit_data(CodedBitstreamUnit *unit, size_t size)
Allocate a new internal data buffer of the given size in the unit.
Definition: cbs.c:323
AV_CODEC_ID_H265
#define AV_CODEC_ID_H265
Definition: codec_id.h:225
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:112
ff_cbs_read_packet
int ff_cbs_read_packet(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVPacket *pkt)
Read the data bitstream from a packet into a fragment, then split into units and decompose.
Definition: cbs.c:289
desc
const char * desc
Definition: libsvtav1.c:83
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
ff_cbs_init
av_cold int ff_cbs_init(CodedBitstreamContext **ctx_ptr, enum AVCodecID codec_id, void *log_ctx)
Create and initialise a new context for the given codec.
Definition: cbs.c:76
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVPacket
This structure stores compressed data.
Definition: packet.h:351
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
int32_t
int32_t
Definition: audioconvert.c:56
convert_header.str
string str
Definition: convert_header.py:20
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
ff_cbs_type_h264
const CodedBitstreamType ff_cbs_type_h264
Definition: cbs_h2645.c:1434
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
CodedBitstreamFragment::data_ref
AVBufferRef * data_ref
A reference to the buffer containing data.
Definition: cbs.h:144
cbs_read_fragment_content
static int cbs_read_fragment_content(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Definition: cbs.c:179
ff_cbs_flush
av_cold void ff_cbs_flush(CodedBitstreamContext *ctx)
Reset all internal state in a context.
Definition: cbs.c:121
get_sbits_long
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
Definition: get_bits.h:590
ff_cbs_type_h265
const CodedBitstreamType ff_cbs_type_h265
Definition: cbs_h2645.c:1450
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:52
snprintf
#define snprintf
Definition: snprintf.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1241
CodedBitstreamFragment::nb_units
int nb_units
Number of units in this fragment.
Definition: cbs.h:152
ff_cbs_delete_unit
void ff_cbs_delete_unit(CodedBitstreamFragment *frag, int position)
Delete a unit from a fragment and free all memory it uses.
Definition: cbs.c:819