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oggenc.c
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1 /*
2  * Ogg muxer
3  * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
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 #include <stdint.h>
23 
24 #include "libavutil/crc.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/random_seed.h"
28 #include "libavcodec/xiph.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/flac.h"
31 #include "avformat.h"
32 #include "avio_internal.h"
33 #include "internal.h"
34 #include "vorbiscomment.h"
35 
36 #define MAX_PAGE_SIZE 65025
37 
38 typedef struct {
39  int64_t start_granule;
40  int64_t granule;
46  uint16_t size;
47 } OGGPage;
48 
49 typedef struct {
50  unsigned page_counter;
52  int header_len[3];
53  /** for theora granule */
54  int kfgshift;
55  int64_t last_kf_pts;
56  int vrev;
57  int eos;
58  unsigned page_count; ///< number of page buffered
59  OGGPage page; ///< current page
60  unsigned serial_num; ///< serial number
61  int64_t last_granule; ///< last packet granule
63 
64 typedef struct OGGPageList {
66  struct OGGPageList *next;
67 } OGGPageList;
68 
69 typedef struct {
70  const AVClass *class;
72  int pref_size; ///< preferred page size (0 => fill all segments)
73  int64_t pref_duration; ///< preferred page duration (0 => fill all segments)
74 } OGGContext;
75 
76 #define OFFSET(x) offsetof(OGGContext, x)
77 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
78 
79 static const AVOption options[] = {
80  { "oggpagesize", "Set preferred Ogg page size.",
81  offsetof(OGGContext, pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, AV_OPT_FLAG_ENCODING_PARAM},
82  { "pagesize", "preferred page size in bytes (deprecated)",
83  OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
84  { "page_duration", "preferred page duration, in microseconds",
85  OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
86  { NULL },
87 };
88 
89 #define OGG_CLASS(flavor, name)\
90 static const AVClass flavor ## _muxer_class = {\
91  .class_name = #name " muxer",\
92  .item_name = av_default_item_name,\
93  .option = options,\
94  .version = LIBAVUTIL_VERSION_INT,\
95 };
96 
97 static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
98 {
99  int64_t pos = avio_tell(pb);
100  uint32_t checksum = ffio_get_checksum(pb);
101  avio_seek(pb, crc_offset, SEEK_SET);
102  avio_wb32(pb, checksum);
103  avio_seek(pb, pos, SEEK_SET);
104 }
105 
106 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
107 {
108  OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
109  AVIOContext *pb;
110  int64_t crc_offset;
111  int ret, size;
112  uint8_t *buf;
113 
114  ret = avio_open_dyn_buf(&pb);
115  if (ret < 0)
116  return ret;
118  ffio_wfourcc(pb, "OggS");
119  avio_w8(pb, 0);
120  avio_w8(pb, page->flags | extra_flags);
121  avio_wl64(pb, page->granule);
122  avio_wl32(pb, oggstream->serial_num);
123  avio_wl32(pb, oggstream->page_counter++);
124  crc_offset = avio_tell(pb);
125  avio_wl32(pb, 0); // crc
126  avio_w8(pb, page->segments_count);
127  avio_write(pb, page->segments, page->segments_count);
128  avio_write(pb, page->data, page->size);
129 
130  ogg_update_checksum(s, pb, crc_offset);
131  avio_flush(pb);
132 
133  size = avio_close_dyn_buf(pb, &buf);
134  if (size < 0)
135  return size;
136 
137  avio_write(s->pb, buf, size);
138  avio_flush(s->pb);
139  av_free(buf);
140  oggstream->page_count--;
141  return 0;
142 }
143 
144 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
145 {
146  return oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1));
147 }
148 
149 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
150 {
151  if (oggstream->kfgshift)
152  return (granule>>oggstream->kfgshift) +
153  (granule & ((1<<oggstream->kfgshift)-1));
154  else
155  return granule;
156 }
157 
159 {
160  AVStream *st2 = s->streams[next->stream_index];
161  AVStream *st = s->streams[page->stream_index];
162  int64_t next_granule, cur_granule;
163 
164  if (next->granule == -1 || page->granule == -1)
165  return 0;
166 
167  next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
168  st2->time_base, AV_TIME_BASE_Q);
169  cur_granule = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
170  st ->time_base, AV_TIME_BASE_Q);
171  return next_granule > cur_granule;
172 }
173 
174 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
175 {
176  oggstream->page.granule = -1;
177  oggstream->page.flags = 0;
178  oggstream->page.segments_count = 0;
179  oggstream->page.size = 0;
180  return 0;
181 }
182 
184 {
185  OGGContext *ogg = s->priv_data;
186  OGGPageList **p = &ogg->page_list;
187  OGGPageList *l = av_mallocz(sizeof(*l));
188 
189  if (!l)
190  return AVERROR(ENOMEM);
191  l->page = oggstream->page;
192 
193  oggstream->page.start_granule = oggstream->page.granule;
194  oggstream->page_count++;
195  ogg_reset_cur_page(oggstream);
196 
197  while (*p) {
198  if (ogg_compare_granule(s, &(*p)->page, &l->page))
199  break;
200  p = &(*p)->next;
201  }
202  l->next = *p;
203  *p = l;
204 
205  return 0;
206 }
207 
209  uint8_t *data, unsigned size, int64_t granule,
210  int header)
211 {
212  OGGStreamContext *oggstream = st->priv_data;
213  OGGContext *ogg = s->priv_data;
214  int total_segments = size / 255 + 1;
215  uint8_t *p = data;
216  int i, segments, len, flush = 0;
217 
218  // Handles VFR by flushing page because this frame needs to have a timestamp
219  // For theora, keyframes also need to have a timestamp to correctly mark
220  // them as such, otherwise seeking will not work correctly at the very
221  // least with old libogg versions.
222  // Do not try to flush header packets though, that will create broken files.
223  if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
224  (ogg_granule_to_timestamp(oggstream, granule) >
225  ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
226  ogg_key_granule(oggstream, granule))) {
227  if (oggstream->page.granule != -1)
228  ogg_buffer_page(s, oggstream);
229  flush = 1;
230  }
231 
232  // avoid a continued page
233  if (!header && oggstream->page.size > 0 &&
234  MAX_PAGE_SIZE - oggstream->page.size < size) {
235  ogg_buffer_page(s, oggstream);
236  }
237 
238  for (i = 0; i < total_segments; ) {
239  OGGPage *page = &oggstream->page;
240 
241  segments = FFMIN(total_segments - i, 255 - page->segments_count);
242 
243  if (i && !page->segments_count)
244  page->flags |= 1; // continued packet
245 
246  memset(page->segments+page->segments_count, 255, segments - 1);
247  page->segments_count += segments - 1;
248 
249  len = FFMIN(size, segments*255);
250  page->segments[page->segments_count++] = len - (segments-1)*255;
251  memcpy(page->data+page->size, p, len);
252  p += len;
253  size -= len;
254  i += segments;
255  page->size += len;
256 
257  if (i == total_segments)
258  page->granule = granule;
259 
260  if (!header) {
261  AVStream *st = s->streams[page->stream_index];
262 
263  int64_t start = av_rescale_q(page->start_granule, st->time_base,
265  int64_t next = av_rescale_q(page->granule, st->time_base,
267 
268  if (page->segments_count == 255 ||
269  (ogg->pref_size > 0 && page->size >= ogg->pref_size) ||
270  (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
271  ogg_buffer_page(s, oggstream);
272  }
273  }
274  }
275 
276  if (flush && oggstream->page.granule != -1)
277  ogg_buffer_page(s, oggstream);
278 
279  return 0;
280 }
281 
282 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
283  int *header_len, AVDictionary **m, int framing_bit)
284 {
285  const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
286  int size;
287  uint8_t *p, *p0;
288 
290 
291  size = offset + ff_vorbiscomment_length(*m, vendor) + framing_bit;
292  p = av_mallocz(size);
293  if (!p)
294  return NULL;
295  p0 = p;
296 
297  p += offset;
298  ff_vorbiscomment_write(&p, m, vendor);
299  if (framing_bit)
300  bytestream_put_byte(&p, 1);
301 
302  *header_len = size;
303  return p0;
304 }
305 
307  OGGStreamContext *oggstream, int bitexact,
308  AVDictionary **m)
309 {
310  uint8_t *p;
311 
313  return AVERROR(EINVAL);
314 
315  // first packet: STREAMINFO
316  oggstream->header_len[0] = 51;
317  oggstream->header[0] = av_mallocz(51); // per ogg flac specs
318  p = oggstream->header[0];
319  if (!p)
320  return AVERROR(ENOMEM);
321  bytestream_put_byte(&p, 0x7F);
322  bytestream_put_buffer(&p, "FLAC", 4);
323  bytestream_put_byte(&p, 1); // major version
324  bytestream_put_byte(&p, 0); // minor version
325  bytestream_put_be16(&p, 1); // headers packets without this one
326  bytestream_put_buffer(&p, "fLaC", 4);
327  bytestream_put_byte(&p, 0x00); // streaminfo
328  bytestream_put_be24(&p, 34);
330 
331  // second packet: VorbisComment
332  p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
333  if (!p)
334  return AVERROR(ENOMEM);
335  oggstream->header[1] = p;
336  bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
337  bytestream_put_be24(&p, oggstream->header_len[1] - 4);
338 
339  return 0;
340 }
341 
342 #define SPEEX_HEADER_SIZE 80
343 
345  OGGStreamContext *oggstream, int bitexact,
346  AVDictionary **m)
347 {
348  uint8_t *p;
349 
350  if (avctx->extradata_size < SPEEX_HEADER_SIZE)
351  return -1;
352 
353  // first packet: Speex header
355  if (!p)
356  return AVERROR(ENOMEM);
357  oggstream->header[0] = p;
358  oggstream->header_len[0] = SPEEX_HEADER_SIZE;
360  AV_WL32(&oggstream->header[0][68], 0); // set extra_headers to 0
361 
362  // second packet: VorbisComment
363  p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
364  if (!p)
365  return AVERROR(ENOMEM);
366  oggstream->header[1] = p;
367 
368  return 0;
369 }
370 
371 #define OPUS_HEADER_SIZE 19
372 
374  OGGStreamContext *oggstream, int bitexact,
375  AVDictionary **m)
376 {
377  uint8_t *p;
378 
379  if (avctx->extradata_size < OPUS_HEADER_SIZE)
380  return -1;
381 
382  /* first packet: Opus header */
383  p = av_mallocz(avctx->extradata_size);
384  if (!p)
385  return AVERROR(ENOMEM);
386  oggstream->header[0] = p;
387  oggstream->header_len[0] = avctx->extradata_size;
388  bytestream_put_buffer(&p, avctx->extradata, avctx->extradata_size);
389 
390  /* second packet: VorbisComment */
391  p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
392  if (!p)
393  return AVERROR(ENOMEM);
394  oggstream->header[1] = p;
395  bytestream_put_buffer(&p, "OpusTags", 8);
396 
397  return 0;
398 }
399 
401 {
402  OGGContext *ogg = s->priv_data;
403  OGGPageList *next, *p;
404 
405  if (!ogg->page_list)
406  return;
407 
408  for (p = ogg->page_list; p; ) {
409  OGGStreamContext *oggstream =
411  if (oggstream->page_count < 2 && !flush)
412  break;
413  ogg_write_page(s, &p->page,
414  flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
415  next = p->next;
416  av_freep(&p);
417  p = next;
418  }
419  ogg->page_list = p;
420 }
421 
423 {
424  OGGContext *ogg = s->priv_data;
425  OGGStreamContext *oggstream = NULL;
426  int i, j;
427 
428  if (ogg->pref_size)
429  av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
430 
431  for (i = 0; i < s->nb_streams; i++) {
432  AVStream *st = s->streams[i];
433  unsigned serial_num = i;
434 
435  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
436  if (st->codec->codec_id == AV_CODEC_ID_OPUS)
437  /* Opus requires a fixed 48kHz clock */
438  avpriv_set_pts_info(st, 64, 1, 48000);
439  else
440  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
441  }
442 
443  if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
445  st->codec->codec_id != AV_CODEC_ID_SPEEX &&
446  st->codec->codec_id != AV_CODEC_ID_FLAC &&
447  st->codec->codec_id != AV_CODEC_ID_OPUS) {
448  av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
449  return -1;
450  }
451 
452  if (!st->codec->extradata || !st->codec->extradata_size) {
453  av_log(s, AV_LOG_ERROR, "No extradata present\n");
454  return -1;
455  }
456  oggstream = av_mallocz(sizeof(*oggstream));
457  if (!oggstream)
458  return AVERROR(ENOMEM);
459 
460  oggstream->page.stream_index = i;
461 
462  if (!(s->flags & AVFMT_FLAG_BITEXACT))
463  do {
464  serial_num = av_get_random_seed();
465  for (j = 0; j < i; j++) {
466  OGGStreamContext *sc = s->streams[j]->priv_data;
467  if (serial_num == sc->serial_num)
468  break;
469  }
470  } while (j < i);
471  oggstream->serial_num = serial_num;
472 
474 
475  st->priv_data = oggstream;
476  if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
477  int err = ogg_build_flac_headers(st->codec, oggstream,
479  &st->metadata);
480  if (err) {
481  av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
482  av_freep(&st->priv_data);
483  return err;
484  }
485  } else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
486  int err = ogg_build_speex_headers(st->codec, oggstream,
488  &st->metadata);
489  if (err) {
490  av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
491  av_freep(&st->priv_data);
492  return err;
493  }
494  } else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
495  int err = ogg_build_opus_headers(st->codec, oggstream,
497  &st->metadata);
498  if (err) {
499  av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
500  av_freep(&st->priv_data);
501  return err;
502  }
503  } else {
504  uint8_t *p;
505  const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
506  int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
507  int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
508 
510  st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
511  oggstream->header, oggstream->header_len) < 0) {
512  av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
513  av_freep(&st->priv_data);
514  return -1;
515  }
516 
518  &oggstream->header_len[1], &st->metadata,
519  framing_bit);
520  oggstream->header[1] = p;
521  if (!p)
522  return AVERROR(ENOMEM);
523 
524  bytestream_put_byte(&p, header_type);
525  bytestream_put_buffer(&p, cstr, 6);
526 
527  if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
528  /** KFGSHIFT is the width of the less significant section of the granule position
529  The less significant section is the frame count since the last keyframe */
530  oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
531  oggstream->vrev = oggstream->header[0][9];
532  av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
533  oggstream->kfgshift, oggstream->vrev);
534  }
535  }
536  }
537 
538  for (j = 0; j < s->nb_streams; j++) {
539  OGGStreamContext *oggstream = s->streams[j]->priv_data;
540  ogg_buffer_data(s, s->streams[j], oggstream->header[0],
541  oggstream->header_len[0], 0, 1);
542  oggstream->page.flags |= 2; // bos
543  ogg_buffer_page(s, oggstream);
544  }
545  for (j = 0; j < s->nb_streams; j++) {
546  AVStream *st = s->streams[j];
547  OGGStreamContext *oggstream = st->priv_data;
548  for (i = 1; i < 3; i++) {
549  if (oggstream->header_len[i])
550  ogg_buffer_data(s, st, oggstream->header[i],
551  oggstream->header_len[i], 0, 1);
552  }
553  ogg_buffer_page(s, oggstream);
554  }
555 
556  oggstream->page.start_granule = AV_NOPTS_VALUE;
557 
558  ogg_write_pages(s, 2);
559 
560  return 0;
561 }
562 
564 {
565  AVStream *st = s->streams[pkt->stream_index];
566  OGGStreamContext *oggstream = st->priv_data;
567  int ret;
568  int64_t granule;
569 
570  if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
571  int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
572  int pframe_count;
573  if (pkt->flags & AV_PKT_FLAG_KEY)
574  oggstream->last_kf_pts = pts;
575  pframe_count = pts - oggstream->last_kf_pts;
576  // prevent frame count from overflow if key frame flag is not set
577  if (pframe_count >= (1<<oggstream->kfgshift)) {
578  oggstream->last_kf_pts += pframe_count;
579  pframe_count = 0;
580  }
581  granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
582  } else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
583  granule = pkt->pts + pkt->duration +
585  (AVRational){ 1, st->codec->sample_rate },
586  st->time_base);
587  else
588  granule = pkt->pts + pkt->duration;
589 
590  if (oggstream->page.start_granule == AV_NOPTS_VALUE)
591  oggstream->page.start_granule = pkt->pts;
592 
593  ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
594  if (ret < 0)
595  return ret;
596 
597  ogg_write_pages(s, 0);
598 
599  oggstream->last_granule = granule;
600 
601  return 0;
602 }
603 
605 {
606  int i;
607 
608  if (pkt)
609  return ogg_write_packet_internal(s, pkt);
610 
611  for (i = 0; i < s->nb_streams; i++) {
612  OGGStreamContext *oggstream = s->streams[i]->priv_data;
613  if (oggstream->page.segments_count)
614  ogg_buffer_page(s, oggstream);
615  }
616 
617  ogg_write_pages(s, 2);
618  return 0;
619 }
620 
622 {
623  int i;
624 
625  /* flush current page if needed */
626  for (i = 0; i < s->nb_streams; i++) {
627  OGGStreamContext *oggstream = s->streams[i]->priv_data;
628 
629  if (oggstream->page.size > 0)
630  ogg_buffer_page(s, oggstream);
631  }
632 
633  ogg_write_pages(s, 1);
634 
635  for (i = 0; i < s->nb_streams; i++) {
636  AVStream *st = s->streams[i];
637  OGGStreamContext *oggstream = st->priv_data;
638  if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
639  st->codec->codec_id == AV_CODEC_ID_SPEEX ||
640  st->codec->codec_id == AV_CODEC_ID_OPUS) {
641  av_freep(&oggstream->header[0]);
642  }
643  av_freep(&oggstream->header[1]);
644  av_freep(&st->priv_data);
645  }
646  return 0;
647 }
648 
649 #if CONFIG_OGG_MUXER
650 OGG_CLASS(ogg, Ogg)
651 AVOutputFormat ff_ogg_muxer = {
652  .name = "ogg",
653  .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
654  .mime_type = "application/ogg",
655  .extensions = "ogg,ogv"
656 #if !CONFIG_SPX_MUXER
657  ",spx"
658 #endif
659 #if !CONFIG_OPUS_MUXER
660  ",opus"
661 #endif
662  ,
663  .priv_data_size = sizeof(OGGContext),
664  .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
666  .video_codec = AV_CODEC_ID_THEORA,
671  .priv_class = &ogg_muxer_class,
672 };
673 #endif
674 
675 #if CONFIG_OGA_MUXER
676 OGG_CLASS(oga, Ogg audio)
677 AVOutputFormat ff_oga_muxer = {
678  .name = "oga",
679  .long_name = NULL_IF_CONFIG_SMALL("Ogg Audio"),
680  .mime_type = "audio/ogg",
681  .extensions = "oga",
682  .priv_data_size = sizeof(OGGContext),
683  .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
684  AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
689  .priv_class = &oga_muxer_class,
690 };
691 #endif
692 
693 #if CONFIG_SPX_MUXER
694 OGG_CLASS(spx, Ogg Speex)
695 AVOutputFormat ff_spx_muxer = {
696  .name = "spx",
697  .long_name = NULL_IF_CONFIG_SMALL("Ogg Speex"),
698  .mime_type = "audio/ogg",
699  .extensions = "spx",
700  .priv_data_size = sizeof(OGGContext),
701  .audio_codec = AV_CODEC_ID_SPEEX,
706  .priv_class = &spx_muxer_class,
707 };
708 #endif
709 
710 #if CONFIG_OPUS_MUXER
711 OGG_CLASS(opus, Ogg Opus)
712 AVOutputFormat ff_opus_muxer = {
713  .name = "opus",
714  .long_name = NULL_IF_CONFIG_SMALL("Ogg Opus"),
715  .mime_type = "audio/ogg",
716  .extensions = "opus",
717  .priv_data_size = sizeof(OGGContext),
718  .audio_codec = AV_CODEC_ID_OPUS,
723  .priv_class = &opus_muxer_class,
724 };
725 #endif