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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  enum FLACExtradataFormat format;
311  uint8_t *streaminfo;
312  uint8_t *p;
313 
314  if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
315  return -1;
316 
317  // first packet: STREAMINFO
318  oggstream->header_len[0] = 51;
319  oggstream->header[0] = av_mallocz(51); // per ogg flac specs
320  p = oggstream->header[0];
321  if (!p)
322  return AVERROR(ENOMEM);
323  bytestream_put_byte(&p, 0x7F);
324  bytestream_put_buffer(&p, "FLAC", 4);
325  bytestream_put_byte(&p, 1); // major version
326  bytestream_put_byte(&p, 0); // minor version
327  bytestream_put_be16(&p, 1); // headers packets without this one
328  bytestream_put_buffer(&p, "fLaC", 4);
329  bytestream_put_byte(&p, 0x00); // streaminfo
330  bytestream_put_be24(&p, 34);
332 
333  // second packet: VorbisComment
334  p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
335  if (!p)
336  return AVERROR(ENOMEM);
337  oggstream->header[1] = p;
338  bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
339  bytestream_put_be24(&p, oggstream->header_len[1] - 4);
340 
341  return 0;
342 }
343 
344 #define SPEEX_HEADER_SIZE 80
345 
347  OGGStreamContext *oggstream, int bitexact,
348  AVDictionary **m)
349 {
350  uint8_t *p;
351 
352  if (avctx->extradata_size < SPEEX_HEADER_SIZE)
353  return -1;
354 
355  // first packet: Speex header
357  if (!p)
358  return AVERROR(ENOMEM);
359  oggstream->header[0] = p;
360  oggstream->header_len[0] = SPEEX_HEADER_SIZE;
362  AV_WL32(&oggstream->header[0][68], 0); // set extra_headers to 0
363 
364  // second packet: VorbisComment
365  p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
366  if (!p)
367  return AVERROR(ENOMEM);
368  oggstream->header[1] = p;
369 
370  return 0;
371 }
372 
373 #define OPUS_HEADER_SIZE 19
374 
376  OGGStreamContext *oggstream, int bitexact,
377  AVDictionary **m)
378 {
379  uint8_t *p;
380 
381  if (avctx->extradata_size < OPUS_HEADER_SIZE)
382  return -1;
383 
384  /* first packet: Opus header */
385  p = av_mallocz(avctx->extradata_size);
386  if (!p)
387  return AVERROR(ENOMEM);
388  oggstream->header[0] = p;
389  oggstream->header_len[0] = avctx->extradata_size;
390  bytestream_put_buffer(&p, avctx->extradata, avctx->extradata_size);
391 
392  /* second packet: VorbisComment */
393  p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
394  if (!p)
395  return AVERROR(ENOMEM);
396  oggstream->header[1] = p;
397  bytestream_put_buffer(&p, "OpusTags", 8);
398 
399  return 0;
400 }
401 
403 {
404  OGGContext *ogg = s->priv_data;
405  OGGPageList *next, *p;
406 
407  if (!ogg->page_list)
408  return;
409 
410  for (p = ogg->page_list; p; ) {
411  OGGStreamContext *oggstream =
413  if (oggstream->page_count < 2 && !flush)
414  break;
415  ogg_write_page(s, &p->page,
416  flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
417  next = p->next;
418  av_freep(&p);
419  p = next;
420  }
421  ogg->page_list = p;
422 }
423 
425 {
426  OGGContext *ogg = s->priv_data;
427  OGGStreamContext *oggstream = NULL;
428  int i, j;
429 
430  if (ogg->pref_size)
431  av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
432 
433  for (i = 0; i < s->nb_streams; i++) {
434  AVStream *st = s->streams[i];
435  unsigned serial_num = i;
436 
437  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
438  if (st->codec->codec_id == AV_CODEC_ID_OPUS)
439  /* Opus requires a fixed 48kHz clock */
440  avpriv_set_pts_info(st, 64, 1, 48000);
441  else
442  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
443  }
444 
445  if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
447  st->codec->codec_id != AV_CODEC_ID_SPEEX &&
448  st->codec->codec_id != AV_CODEC_ID_FLAC &&
449  st->codec->codec_id != AV_CODEC_ID_OPUS) {
450  av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
451  return -1;
452  }
453 
454  if (!st->codec->extradata || !st->codec->extradata_size) {
455  av_log(s, AV_LOG_ERROR, "No extradata present\n");
456  return -1;
457  }
458  oggstream = av_mallocz(sizeof(*oggstream));
459  if (!oggstream)
460  return AVERROR(ENOMEM);
461 
462  oggstream->page.stream_index = i;
463 
464  if (!(s->flags & AVFMT_FLAG_BITEXACT))
465  do {
466  serial_num = av_get_random_seed();
467  for (j = 0; j < i; j++) {
468  OGGStreamContext *sc = s->streams[j]->priv_data;
469  if (serial_num == sc->serial_num)
470  break;
471  }
472  } while (j < i);
473  oggstream->serial_num = serial_num;
474 
476 
477  st->priv_data = oggstream;
478  if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
479  int err = ogg_build_flac_headers(st->codec, oggstream,
481  &st->metadata);
482  if (err) {
483  av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
484  av_freep(&st->priv_data);
485  return err;
486  }
487  } else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
488  int err = ogg_build_speex_headers(st->codec, oggstream,
490  &st->metadata);
491  if (err) {
492  av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
493  av_freep(&st->priv_data);
494  return err;
495  }
496  } else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
497  int err = ogg_build_opus_headers(st->codec, oggstream,
499  &st->metadata);
500  if (err) {
501  av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
502  av_freep(&st->priv_data);
503  return err;
504  }
505  } else {
506  uint8_t *p;
507  const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
508  int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
509  int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
510 
512  st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
513  oggstream->header, oggstream->header_len) < 0) {
514  av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
515  av_freep(&st->priv_data);
516  return -1;
517  }
518 
520  &oggstream->header_len[1], &st->metadata,
521  framing_bit);
522  oggstream->header[1] = p;
523  if (!p)
524  return AVERROR(ENOMEM);
525 
526  bytestream_put_byte(&p, header_type);
527  bytestream_put_buffer(&p, cstr, 6);
528 
529  if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
530  /** KFGSHIFT is the width of the less significant section of the granule position
531  The less significant section is the frame count since the last keyframe */
532  oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
533  oggstream->vrev = oggstream->header[0][9];
534  av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
535  oggstream->kfgshift, oggstream->vrev);
536  }
537  }
538  }
539 
540  for (j = 0; j < s->nb_streams; j++) {
541  OGGStreamContext *oggstream = s->streams[j]->priv_data;
542  ogg_buffer_data(s, s->streams[j], oggstream->header[0],
543  oggstream->header_len[0], 0, 1);
544  oggstream->page.flags |= 2; // bos
545  ogg_buffer_page(s, oggstream);
546  }
547  for (j = 0; j < s->nb_streams; j++) {
548  AVStream *st = s->streams[j];
549  OGGStreamContext *oggstream = st->priv_data;
550  for (i = 1; i < 3; i++) {
551  if (oggstream->header_len[i])
552  ogg_buffer_data(s, st, oggstream->header[i],
553  oggstream->header_len[i], 0, 1);
554  }
555  ogg_buffer_page(s, oggstream);
556  }
557 
558  oggstream->page.start_granule = AV_NOPTS_VALUE;
559 
560  ogg_write_pages(s, 2);
561 
562  return 0;
563 }
564 
566 {
567  AVStream *st = s->streams[pkt->stream_index];
568  OGGStreamContext *oggstream = st->priv_data;
569  int ret;
570  int64_t granule;
571 
572  if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
573  int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
574  int pframe_count;
575  if (pkt->flags & AV_PKT_FLAG_KEY)
576  oggstream->last_kf_pts = pts;
577  pframe_count = pts - oggstream->last_kf_pts;
578  // prevent frame count from overflow if key frame flag is not set
579  if (pframe_count >= (1<<oggstream->kfgshift)) {
580  oggstream->last_kf_pts += pframe_count;
581  pframe_count = 0;
582  }
583  granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
584  } else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
585  granule = pkt->pts + pkt->duration +
587  (AVRational){ 1, st->codec->sample_rate },
588  st->time_base);
589  else
590  granule = pkt->pts + pkt->duration;
591 
592  if (oggstream->page.start_granule == AV_NOPTS_VALUE)
593  oggstream->page.start_granule = pkt->pts;
594 
595  ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
596  if (ret < 0)
597  return ret;
598 
599  ogg_write_pages(s, 0);
600 
601  oggstream->last_granule = granule;
602 
603  return 0;
604 }
605 
607 {
608  int i;
609 
610  if (pkt)
611  return ogg_write_packet_internal(s, pkt);
612 
613  for (i = 0; i < s->nb_streams; i++) {
614  OGGStreamContext *oggstream = s->streams[i]->priv_data;
615  if (oggstream->page.segments_count)
616  ogg_buffer_page(s, oggstream);
617  }
618 
619  ogg_write_pages(s, 2);
620  return 0;
621 }
622 
624 {
625  int i;
626 
627  /* flush current page if needed */
628  for (i = 0; i < s->nb_streams; i++) {
629  OGGStreamContext *oggstream = s->streams[i]->priv_data;
630 
631  if (oggstream->page.size > 0)
632  ogg_buffer_page(s, oggstream);
633  }
634 
635  ogg_write_pages(s, 1);
636 
637  for (i = 0; i < s->nb_streams; i++) {
638  AVStream *st = s->streams[i];
639  OGGStreamContext *oggstream = st->priv_data;
640  if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
641  st->codec->codec_id == AV_CODEC_ID_SPEEX ||
642  st->codec->codec_id == AV_CODEC_ID_OPUS) {
643  av_freep(&oggstream->header[0]);
644  }
645  av_freep(&oggstream->header[1]);
646  av_freep(&st->priv_data);
647  }
648  return 0;
649 }
650 
651 #if CONFIG_OGG_MUXER
652 OGG_CLASS(ogg, Ogg)
653 AVOutputFormat ff_ogg_muxer = {
654  .name = "ogg",
655  .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
656  .mime_type = "application/ogg",
657  .extensions = "ogg,ogv"
658 #if !CONFIG_SPX_MUXER
659  ",spx"
660 #endif
661 #if !CONFIG_OPUS_MUXER
662  ",opus"
663 #endif
664  ,
665  .priv_data_size = sizeof(OGGContext),
666  .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
668  .video_codec = AV_CODEC_ID_THEORA,
673  .priv_class = &ogg_muxer_class,
674 };
675 #endif
676 
677 #if CONFIG_OGA_MUXER
678 OGG_CLASS(oga, Ogg audio)
679 AVOutputFormat ff_oga_muxer = {
680  .name = "oga",
681  .long_name = NULL_IF_CONFIG_SMALL("Ogg Audio"),
682  .mime_type = "audio/ogg",
683  .extensions = "oga",
684  .priv_data_size = sizeof(OGGContext),
685  .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
686  AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
691  .priv_class = &oga_muxer_class,
692 };
693 #endif
694 
695 #if CONFIG_SPX_MUXER
696 OGG_CLASS(spx, Ogg Speex)
697 AVOutputFormat ff_spx_muxer = {
698  .name = "spx",
699  .long_name = NULL_IF_CONFIG_SMALL("Ogg Speex"),
700  .mime_type = "audio/ogg",
701  .extensions = "spx",
702  .priv_data_size = sizeof(OGGContext),
703  .audio_codec = AV_CODEC_ID_SPEEX,
708  .priv_class = &spx_muxer_class,
709 };
710 #endif
711 
712 #if CONFIG_OPUS_MUXER
713 OGG_CLASS(opus, Ogg Opus)
714 AVOutputFormat ff_opus_muxer = {
715  .name = "opus",
716  .long_name = NULL_IF_CONFIG_SMALL("Ogg Opus"),
717  .mime_type = "audio/ogg",
718  .extensions = "opus",
719  .priv_data_size = sizeof(OGGContext),
720  .audio_codec = AV_CODEC_ID_OPUS,
725  .priv_class = &opus_muxer_class,
726 };
727 #endif