ff_end_tag: assert that the start is aligned.
[ffmpeg.git] / libavformat / oggenc.c
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 "libavutil/crc.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/mathematics.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/random_seed.h"
27 #include "libavcodec/xiph.h"
28 #include "libavcodec/bytestream.h"
29 #include "libavcodec/flac.h"
30 #include "avformat.h"
31 #include "avio_internal.h"
32 #include "internal.h"
33 #include "vorbiscomment.h"
34
35 #define MAX_PAGE_SIZE 65025
36
37 typedef struct {
38     int64_t start_granule;
39     int64_t granule;
40     int stream_index;
41     uint8_t flags;
42     uint8_t segments_count;
43     uint8_t segments[255];
44     uint8_t data[MAX_PAGE_SIZE];
45     uint16_t size;
46 } OGGPage;
47
48 typedef struct {
49     unsigned page_counter;
50     uint8_t *header[3];
51     int header_len[3];
52     /** for theora granule */
53     int kfgshift;
54     int64_t last_kf_pts;
55     int vrev;
56     int eos;
57     unsigned page_count; ///< number of page buffered
58     OGGPage page; ///< current page
59     unsigned serial_num; ///< serial number
60     int64_t last_granule; ///< last packet granule
61 } OGGStreamContext;
62
63 typedef struct OGGPageList {
64     OGGPage page;
65     struct OGGPageList *next;
66 } OGGPageList;
67
68 typedef struct {
69     const AVClass *class;
70     OGGPageList *page_list;
71     int pref_size; ///< preferred page size (0 => fill all segments)
72     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)
73 } OGGContext;
74
75 #define OFFSET(x) offsetof(OGGContext, x)
76 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
77
78 static const AVOption options[] = {
79     { "oggpagesize", "Set preferred Ogg page size.",
80       offsetof(OGGContext, pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, AV_OPT_FLAG_ENCODING_PARAM},
81     { "pagesize", "preferred page size in bytes (deprecated)",
82         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
83     { "page_duration", "preferred page duration, in microseconds",
84         OFFSET(pref_duration), AV_OPT_TYPE_INT, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
85     { NULL },
86 };
87
88 static const AVClass ogg_muxer_class = {
89     .class_name = "Ogg muxer",
90     .item_name  = av_default_item_name,
91     .option     = options,
92     .version    = LIBAVUTIL_VERSION_INT,
93 };
94
95
96 static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
97 {
98     int64_t pos = avio_tell(pb);
99     uint32_t checksum = ffio_get_checksum(pb);
100     avio_seek(pb, crc_offset, SEEK_SET);
101     avio_wb32(pb, checksum);
102     avio_seek(pb, pos, SEEK_SET);
103 }
104
105 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
106 {
107     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
108     AVIOContext *pb;
109     int64_t crc_offset;
110     int ret, size;
111     uint8_t *buf;
112
113     ret = avio_open_dyn_buf(&pb);
114     if (ret < 0)
115         return ret;
116     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
117     ffio_wfourcc(pb, "OggS");
118     avio_w8(pb, 0);
119     avio_w8(pb, page->flags | extra_flags);
120     avio_wl64(pb, page->granule);
121     avio_wl32(pb, oggstream->serial_num);
122     avio_wl32(pb, oggstream->page_counter++);
123     crc_offset = avio_tell(pb);
124     avio_wl32(pb, 0); // crc
125     avio_w8(pb, page->segments_count);
126     avio_write(pb, page->segments, page->segments_count);
127     avio_write(pb, page->data, page->size);
128
129     ogg_update_checksum(s, pb, crc_offset);
130     avio_flush(pb);
131
132     size = avio_close_dyn_buf(pb, &buf);
133     if (size < 0)
134         return size;
135
136     avio_write(s->pb, buf, size);
137     avio_flush(s->pb);
138     av_free(buf);
139     oggstream->page_count--;
140     return 0;
141 }
142
143 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
144 {
145     return oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1));
146 }
147
148 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
149 {
150     if (oggstream->kfgshift)
151         return (granule>>oggstream->kfgshift) +
152             (granule & ((1<<oggstream->kfgshift)-1));
153     else
154         return granule;
155 }
156
157 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
158 {
159     AVStream *st2 = s->streams[next->stream_index];
160     AVStream *st  = s->streams[page->stream_index];
161     int64_t next_granule, cur_granule;
162
163     if (next->granule == -1 || page->granule == -1)
164         return 0;
165
166     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
167                                 st2->time_base, AV_TIME_BASE_Q);
168     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
169                                 st ->time_base, AV_TIME_BASE_Q);
170     return next_granule > cur_granule;
171 }
172
173 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
174 {
175     oggstream->page.granule = -1;
176     oggstream->page.flags = 0;
177     oggstream->page.segments_count = 0;
178     oggstream->page.size = 0;
179     return 0;
180 }
181
182 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
183 {
184     OGGContext *ogg = s->priv_data;
185     OGGPageList **p = &ogg->page_list;
186     OGGPageList *l = av_mallocz(sizeof(*l));
187
188     if (!l)
189         return AVERROR(ENOMEM);
190     l->page = oggstream->page;
191
192     oggstream->page.start_granule = oggstream->page.granule;
193     oggstream->page_count++;
194     ogg_reset_cur_page(oggstream);
195
196     while (*p) {
197         if (ogg_compare_granule(s, &(*p)->page, &l->page))
198             break;
199         p = &(*p)->next;
200     }
201     l->next = *p;
202     *p = l;
203
204     return 0;
205 }
206
207 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
208                            uint8_t *data, unsigned size, int64_t granule,
209                            int header)
210 {
211     OGGStreamContext *oggstream = st->priv_data;
212     OGGContext *ogg = s->priv_data;
213     int total_segments = size / 255 + 1;
214     uint8_t *p = data;
215     int i, segments, len, flush = 0;
216
217     // Handles VFR by flushing page because this frame needs to have a timestamp
218     // For theora, keyframes also need to have a timestamp to correctly mark
219     // them as such, otherwise seeking will not work correctly at the very
220     // least with old libogg versions.
221     // Do not try to flush header packets though, that will create broken files.
222     if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
223         (ogg_granule_to_timestamp(oggstream, granule) >
224          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
225          ogg_key_granule(oggstream, granule))) {
226         if (oggstream->page.granule != -1)
227             ogg_buffer_page(s, oggstream);
228         flush = 1;
229     }
230
231     // avoid a continued page
232     if (!header && oggstream->page.size > 0 &&
233         MAX_PAGE_SIZE - oggstream->page.size < size) {
234         ogg_buffer_page(s, oggstream);
235     }
236
237     for (i = 0; i < total_segments; ) {
238         OGGPage *page = &oggstream->page;
239
240         segments = FFMIN(total_segments - i, 255 - page->segments_count);
241
242         if (i && !page->segments_count)
243             page->flags |= 1; // continued packet
244
245         memset(page->segments+page->segments_count, 255, segments - 1);
246         page->segments_count += segments - 1;
247
248         len = FFMIN(size, segments*255);
249         page->segments[page->segments_count++] = len - (segments-1)*255;
250         memcpy(page->data+page->size, p, len);
251         p += len;
252         size -= len;
253         i += segments;
254         page->size += len;
255
256         if (i == total_segments)
257             page->granule = granule;
258
259         if (!header) {
260             AVStream *st = s->streams[page->stream_index];
261
262             int64_t start = av_rescale_q(page->start_granule, st->time_base,
263                                          AV_TIME_BASE_Q);
264             int64_t next  = av_rescale_q(page->granule, st->time_base,
265                                          AV_TIME_BASE_Q);
266
267             if (page->segments_count == 255 ||
268                 (ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
269                 (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
270                 ogg_buffer_page(s, oggstream);
271             }
272         }
273     }
274
275     if (flush && oggstream->page.granule != -1)
276         ogg_buffer_page(s, oggstream);
277
278     return 0;
279 }
280
281 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
282                                         int *header_len, AVDictionary **m, int framing_bit)
283 {
284     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
285     int size;
286     uint8_t *p, *p0;
287     unsigned int count;
288
289     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
290
291     size = offset + ff_vorbiscomment_length(*m, vendor, &count) + 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, count);
299     if (framing_bit)
300         bytestream_put_byte(&p, 1);
301
302     *header_len = size;
303     return p0;
304 }
305
306 static int ogg_build_flac_headers(AVCodecContext *avctx,
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);
331     bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
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
346 static int ogg_build_speex_headers(AVCodecContext *avctx,
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
356     p = av_mallocz(SPEEX_HEADER_SIZE);
357     if (!p)
358         return AVERROR(ENOMEM);
359     oggstream->header[0] = p;
360     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
361     bytestream_put_buffer(&p, avctx->extradata, 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
375 static int ogg_build_opus_headers(AVCodecContext *avctx,
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
402 static int ogg_write_header(AVFormatContext *s)
403 {
404     OGGContext *ogg = s->priv_data;
405     OGGStreamContext *oggstream = NULL;
406     int i, j;
407
408     if (ogg->pref_size)
409         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
410
411     for (i = 0; i < s->nb_streams; i++) {
412         AVStream *st = s->streams[i];
413         unsigned serial_num = i;
414
415         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
416             if (st->codec->codec_id == AV_CODEC_ID_OPUS)
417                 /* Opus requires a fixed 48kHz clock */
418                 avpriv_set_pts_info(st, 64, 1, 48000);
419             else
420                 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
421         } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
422             avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
423         if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
424             st->codec->codec_id != AV_CODEC_ID_THEORA &&
425             st->codec->codec_id != AV_CODEC_ID_SPEEX  &&
426             st->codec->codec_id != AV_CODEC_ID_FLAC   &&
427             st->codec->codec_id != AV_CODEC_ID_OPUS) {
428             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
429             return -1;
430         }
431
432         if (!st->codec->extradata || !st->codec->extradata_size) {
433             av_log(s, AV_LOG_ERROR, "No extradata present\n");
434             return -1;
435         }
436         oggstream = av_mallocz(sizeof(*oggstream));
437         oggstream->page.stream_index = i;
438
439         if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
440             do {
441                 serial_num = av_get_random_seed();
442                 for (j = 0; j < i; j++) {
443                     OGGStreamContext *sc = s->streams[j]->priv_data;
444                     if (serial_num == sc->serial_num)
445                         break;
446                 }
447             } while (j < i);
448         oggstream->serial_num = serial_num;
449
450         st->priv_data = oggstream;
451         if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
452             int err = ogg_build_flac_headers(st->codec, oggstream,
453                                              st->codec->flags & CODEC_FLAG_BITEXACT,
454                                              &s->metadata);
455             if (err) {
456                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
457                 av_freep(&st->priv_data);
458                 return err;
459             }
460         } else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
461             int err = ogg_build_speex_headers(st->codec, oggstream,
462                                               st->codec->flags & CODEC_FLAG_BITEXACT,
463                                               &s->metadata);
464             if (err) {
465                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
466                 av_freep(&st->priv_data);
467                 return err;
468             }
469         } else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
470             int err = ogg_build_opus_headers(st->codec, oggstream,
471                                              st->codec->flags & CODEC_FLAG_BITEXACT,
472                                              &s->metadata);
473             if (err) {
474                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
475                 av_freep(&st->priv_data);
476                 return err;
477             }
478         } else {
479             uint8_t *p;
480             const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
481             int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
482             int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
483
484             if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
485                                       st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
486                                       oggstream->header, oggstream->header_len) < 0) {
487                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
488                 av_freep(&st->priv_data);
489                 return -1;
490             }
491
492             p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
493                                         &oggstream->header_len[1], &s->metadata,
494                                         framing_bit);
495             oggstream->header[1] = p;
496             if (!p)
497                 return AVERROR(ENOMEM);
498
499             bytestream_put_byte(&p, header_type);
500             bytestream_put_buffer(&p, cstr, 6);
501
502             if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
503                 /** KFGSHIFT is the width of the less significant section of the granule position
504                     The less significant section is the frame count since the last keyframe */
505                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
506                 oggstream->vrev = oggstream->header[0][9];
507                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
508                        oggstream->kfgshift, oggstream->vrev);
509             }
510         }
511     }
512
513     for (j = 0; j < s->nb_streams; j++) {
514         OGGStreamContext *oggstream = s->streams[j]->priv_data;
515         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
516                         oggstream->header_len[0], 0, 1);
517         oggstream->page.flags |= 2; // bos
518         ogg_buffer_page(s, oggstream);
519     }
520     for (j = 0; j < s->nb_streams; j++) {
521         AVStream *st = s->streams[j];
522         OGGStreamContext *oggstream = st->priv_data;
523         for (i = 1; i < 3; i++) {
524             if (oggstream->header_len[i])
525                 ogg_buffer_data(s, st, oggstream->header[i],
526                                 oggstream->header_len[i], 0, 1);
527         }
528         ogg_buffer_page(s, oggstream);
529     }
530
531     oggstream->page.start_granule = AV_NOPTS_VALUE;
532
533     return 0;
534 }
535
536 static void ogg_write_pages(AVFormatContext *s, int flush)
537 {
538     OGGContext *ogg = s->priv_data;
539     OGGPageList *next, *p;
540
541     if (!ogg->page_list)
542         return;
543
544     for (p = ogg->page_list; p; ) {
545         OGGStreamContext *oggstream =
546             s->streams[p->page.stream_index]->priv_data;
547         if (oggstream->page_count < 2 && !flush)
548             break;
549         ogg_write_page(s, &p->page,
550                        flush && oggstream->page_count == 1 ? 4 : 0); // eos
551         next = p->next;
552         av_freep(&p);
553         p = next;
554     }
555     ogg->page_list = p;
556 }
557
558 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
559 {
560     AVStream *st = s->streams[pkt->stream_index];
561     OGGStreamContext *oggstream = st->priv_data;
562     int ret;
563     int64_t granule;
564
565     if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
566         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
567         int pframe_count;
568         if (pkt->flags & AV_PKT_FLAG_KEY)
569             oggstream->last_kf_pts = pts;
570         pframe_count = pts - oggstream->last_kf_pts;
571         // prevent frame count from overflow if key frame flag is not set
572         if (pframe_count >= (1<<oggstream->kfgshift)) {
573             oggstream->last_kf_pts += pframe_count;
574             pframe_count = 0;
575         }
576         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
577     } else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
578         granule = pkt->pts + pkt->duration + av_rescale_q(st->codec->delay, (AVRational){ 1, st->codec->sample_rate }, st->time_base);
579     else
580         granule = pkt->pts + pkt->duration;
581
582     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
583         oggstream->page.start_granule = pkt->pts;
584
585     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
586     if (ret < 0)
587         return ret;
588
589     ogg_write_pages(s, 0);
590
591     oggstream->last_granule = granule;
592
593     return 0;
594 }
595
596 static int ogg_write_trailer(AVFormatContext *s)
597 {
598     int i;
599
600     /* flush current page if needed */
601     for (i = 0; i < s->nb_streams; i++) {
602         OGGStreamContext *oggstream = s->streams[i]->priv_data;
603
604         if (oggstream->page.size > 0)
605             ogg_buffer_page(s, oggstream);
606     }
607
608     ogg_write_pages(s, 1);
609
610     for (i = 0; i < s->nb_streams; i++) {
611         AVStream *st = s->streams[i];
612         OGGStreamContext *oggstream = st->priv_data;
613         if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
614             st->codec->codec_id == AV_CODEC_ID_SPEEX ||
615             st->codec->codec_id == AV_CODEC_ID_OPUS) {
616             av_freep(&oggstream->header[0]);
617         }
618         av_freep(&oggstream->header[1]);
619         av_freep(&st->priv_data);
620     }
621     return 0;
622 }
623
624 AVOutputFormat ff_ogg_muxer = {
625     .name              = "ogg",
626     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
627     .mime_type         = "application/ogg",
628     .extensions        = "ogg,ogv,spx,opus",
629     .priv_data_size    = sizeof(OGGContext),
630     .audio_codec       = AV_CODEC_ID_FLAC,
631     .video_codec       = AV_CODEC_ID_THEORA,
632     .write_header      = ogg_write_header,
633     .write_packet      = ogg_write_packet,
634     .write_trailer     = ogg_write_trailer,
635     .priv_class        = &ogg_muxer_class,
636 };