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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 "libavutil/crc.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/random_seed.h"
26 #include "libavcodec/xiph.h"
27 #include "libavcodec/bytestream.h"
28 #include "libavcodec/flac.h"
29 #include "avformat.h"
30 #include "avio_internal.h"
31 #include "internal.h"
32 #include "vorbiscomment.h"
33
34 #define MAX_PAGE_SIZE 65025
35
36 typedef struct {
37     int64_t start_granule;
38     int64_t granule;
39     int stream_index;
40     uint8_t flags;
41     uint8_t segments_count;
42     uint8_t segments[255];
43     uint8_t data[MAX_PAGE_SIZE];
44     uint16_t size;
45 } OGGPage;
46
47 typedef struct {
48     unsigned page_counter;
49     uint8_t *header[3];
50     int header_len[3];
51     /** for theora granule */
52     int kfgshift;
53     int64_t last_kf_pts;
54     int vrev;
55     int eos;
56     unsigned page_count; ///< number of page buffered
57     OGGPage page; ///< current page
58     unsigned serial_num; ///< serial number
59     int64_t last_granule; ///< last packet granule
60 } OGGStreamContext;
61
62 typedef struct OGGPageList {
63     OGGPage page;
64     struct OGGPageList *next;
65 } OGGPageList;
66
67 typedef struct {
68     const AVClass *class;
69     OGGPageList *page_list;
70     int pref_size; ///< preferred page size (0 => fill all segments)
71     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)
72 } OGGContext;
73
74 #define OFFSET(x) offsetof(OGGContext, x)
75 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
76
77 static const AVOption options[] = {
78     { "oggpagesize", "Set preferred Ogg page size.",
79       offsetof(OGGContext, pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, AV_OPT_FLAG_ENCODING_PARAM},
80     { "pagesize", "preferred page size in bytes (deprecated)",
81         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
82     { "page_duration", "preferred page duration, in microseconds",
83         OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
84     { NULL },
85 };
86
87 static const AVClass ogg_muxer_class = {
88     .class_name = "Ogg muxer",
89     .item_name  = av_default_item_name,
90     .option     = options,
91     .version    = LIBAVUTIL_VERSION_INT,
92 };
93
94
95 static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
96 {
97     int64_t pos = avio_tell(pb);
98     uint32_t checksum = ffio_get_checksum(pb);
99     avio_seek(pb, crc_offset, SEEK_SET);
100     avio_wb32(pb, checksum);
101     avio_seek(pb, pos, SEEK_SET);
102 }
103
104 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
105 {
106     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
107     AVIOContext *pb;
108     int64_t crc_offset;
109     int ret, size;
110     uint8_t *buf;
111
112     ret = avio_open_dyn_buf(&pb);
113     if (ret < 0)
114         return ret;
115     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
116     ffio_wfourcc(pb, "OggS");
117     avio_w8(pb, 0);
118     avio_w8(pb, page->flags | extra_flags);
119     avio_wl64(pb, page->granule);
120     avio_wl32(pb, oggstream->serial_num);
121     avio_wl32(pb, oggstream->page_counter++);
122     crc_offset = avio_tell(pb);
123     avio_wl32(pb, 0); // crc
124     avio_w8(pb, page->segments_count);
125     avio_write(pb, page->segments, page->segments_count);
126     avio_write(pb, page->data, page->size);
127
128     ogg_update_checksum(s, pb, crc_offset);
129     avio_flush(pb);
130
131     size = avio_close_dyn_buf(pb, &buf);
132     if (size < 0)
133         return size;
134
135     avio_write(s->pb, buf, size);
136     avio_flush(s->pb);
137     av_free(buf);
138     oggstream->page_count--;
139     return 0;
140 }
141
142 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
143 {
144     return oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1));
145 }
146
147 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
148 {
149     if (oggstream->kfgshift)
150         return (granule>>oggstream->kfgshift) +
151             (granule & ((1<<oggstream->kfgshift)-1));
152     else
153         return granule;
154 }
155
156 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
157 {
158     AVStream *st2 = s->streams[next->stream_index];
159     AVStream *st  = s->streams[page->stream_index];
160     int64_t next_granule, cur_granule;
161
162     if (next->granule == -1 || page->granule == -1)
163         return 0;
164
165     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
166                                 st2->time_base, AV_TIME_BASE_Q);
167     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
168                                 st ->time_base, AV_TIME_BASE_Q);
169     return next_granule > cur_granule;
170 }
171
172 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
173 {
174     oggstream->page.granule = -1;
175     oggstream->page.flags = 0;
176     oggstream->page.segments_count = 0;
177     oggstream->page.size = 0;
178     return 0;
179 }
180
181 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
182 {
183     OGGContext *ogg = s->priv_data;
184     OGGPageList **p = &ogg->page_list;
185     OGGPageList *l = av_mallocz(sizeof(*l));
186
187     if (!l)
188         return AVERROR(ENOMEM);
189     l->page = oggstream->page;
190
191     oggstream->page.start_granule = oggstream->page.granule;
192     oggstream->page_count++;
193     ogg_reset_cur_page(oggstream);
194
195     while (*p) {
196         if (ogg_compare_granule(s, &(*p)->page, &l->page))
197             break;
198         p = &(*p)->next;
199     }
200     l->next = *p;
201     *p = l;
202
203     return 0;
204 }
205
206 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
207                            uint8_t *data, unsigned size, int64_t granule,
208                            int header)
209 {
210     OGGStreamContext *oggstream = st->priv_data;
211     OGGContext *ogg = s->priv_data;
212     int total_segments = size / 255 + 1;
213     uint8_t *p = data;
214     int i, segments, len, flush = 0;
215
216     // Handles VFR by flushing page because this frame needs to have a timestamp
217     // For theora, keyframes also need to have a timestamp to correctly mark
218     // them as such, otherwise seeking will not work correctly at the very
219     // least with old libogg versions.
220     // Do not try to flush header packets though, that will create broken files.
221     if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
222         (ogg_granule_to_timestamp(oggstream, granule) >
223          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
224          ogg_key_granule(oggstream, granule))) {
225         if (oggstream->page.granule != -1)
226             ogg_buffer_page(s, oggstream);
227         flush = 1;
228     }
229
230     // avoid a continued page
231     if (!header && oggstream->page.size > 0 &&
232         MAX_PAGE_SIZE - oggstream->page.size < size) {
233         ogg_buffer_page(s, oggstream);
234     }
235
236     for (i = 0; i < total_segments; ) {
237         OGGPage *page = &oggstream->page;
238
239         segments = FFMIN(total_segments - i, 255 - page->segments_count);
240
241         if (i && !page->segments_count)
242             page->flags |= 1; // continued packet
243
244         memset(page->segments+page->segments_count, 255, segments - 1);
245         page->segments_count += segments - 1;
246
247         len = FFMIN(size, segments*255);
248         page->segments[page->segments_count++] = len - (segments-1)*255;
249         memcpy(page->data+page->size, p, len);
250         p += len;
251         size -= len;
252         i += segments;
253         page->size += len;
254
255         if (i == total_segments)
256             page->granule = granule;
257
258         if (!header) {
259             AVStream *st = s->streams[page->stream_index];
260
261             int64_t start = av_rescale_q(page->start_granule, st->time_base,
262                                          AV_TIME_BASE_Q);
263             int64_t next  = av_rescale_q(page->granule, st->time_base,
264                                          AV_TIME_BASE_Q);
265
266             if (page->segments_count == 255 ||
267                 (ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
268                 (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
269                 ogg_buffer_page(s, oggstream);
270             }
271         }
272     }
273
274     if (flush && oggstream->page.granule != -1)
275         ogg_buffer_page(s, oggstream);
276
277     return 0;
278 }
279
280 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
281                                         int *header_len, AVDictionary **m, int framing_bit)
282 {
283     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
284     int size;
285     uint8_t *p, *p0;
286     unsigned int count;
287
288     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
289
290     size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
291     p = av_mallocz(size);
292     if (!p)
293         return NULL;
294     p0 = p;
295
296     p += offset;
297     ff_vorbiscomment_write(&p, m, vendor, count);
298     if (framing_bit)
299         bytestream_put_byte(&p, 1);
300
301     *header_len = size;
302     return p0;
303 }
304
305 static int ogg_build_flac_headers(AVCodecContext *avctx,
306                                   OGGStreamContext *oggstream, int bitexact,
307                                   AVDictionary **m)
308 {
309     enum FLACExtradataFormat format;
310     uint8_t *streaminfo;
311     uint8_t *p;
312
313     if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
314         return -1;
315
316     // first packet: STREAMINFO
317     oggstream->header_len[0] = 51;
318     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
319     p = oggstream->header[0];
320     if (!p)
321         return AVERROR(ENOMEM);
322     bytestream_put_byte(&p, 0x7F);
323     bytestream_put_buffer(&p, "FLAC", 4);
324     bytestream_put_byte(&p, 1); // major version
325     bytestream_put_byte(&p, 0); // minor version
326     bytestream_put_be16(&p, 1); // headers packets without this one
327     bytestream_put_buffer(&p, "fLaC", 4);
328     bytestream_put_byte(&p, 0x00); // streaminfo
329     bytestream_put_be24(&p, 34);
330     bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
331
332     // second packet: VorbisComment
333     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
334     if (!p)
335         return AVERROR(ENOMEM);
336     oggstream->header[1] = p;
337     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
338     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
339
340     return 0;
341 }
342
343 #define SPEEX_HEADER_SIZE 80
344
345 static int ogg_build_speex_headers(AVCodecContext *avctx,
346                                    OGGStreamContext *oggstream, int bitexact,
347                                    AVDictionary **m)
348 {
349     uint8_t *p;
350
351     if (avctx->extradata_size < SPEEX_HEADER_SIZE)
352         return -1;
353
354     // first packet: Speex header
355     p = av_mallocz(SPEEX_HEADER_SIZE);
356     if (!p)
357         return AVERROR(ENOMEM);
358     oggstream->header[0] = p;
359     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
360     bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
361     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
362
363     // second packet: VorbisComment
364     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
365     if (!p)
366         return AVERROR(ENOMEM);
367     oggstream->header[1] = p;
368
369     return 0;
370 }
371
372 #define OPUS_HEADER_SIZE 19
373
374 static int ogg_build_opus_headers(AVCodecContext *avctx,
375                                   OGGStreamContext *oggstream, int bitexact,
376                                   AVDictionary **m)
377 {
378     uint8_t *p;
379
380     if (avctx->extradata_size < OPUS_HEADER_SIZE)
381         return -1;
382
383     /* first packet: Opus header */
384     p = av_mallocz(avctx->extradata_size);
385     if (!p)
386         return AVERROR(ENOMEM);
387     oggstream->header[0] = p;
388     oggstream->header_len[0] = avctx->extradata_size;
389     bytestream_put_buffer(&p, avctx->extradata, avctx->extradata_size);
390
391     /* second packet: VorbisComment */
392     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
393     if (!p)
394         return AVERROR(ENOMEM);
395     oggstream->header[1] = p;
396     bytestream_put_buffer(&p, "OpusTags", 8);
397
398     return 0;
399 }
400
401 static int ogg_write_header(AVFormatContext *s)
402 {
403     OGGContext *ogg = s->priv_data;
404     OGGStreamContext *oggstream = NULL;
405     int i, j;
406
407     if (ogg->pref_size)
408         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
409
410     for (i = 0; i < s->nb_streams; i++) {
411         AVStream *st = s->streams[i];
412         unsigned serial_num = i;
413
414         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
415             if (st->codec->codec_id == AV_CODEC_ID_OPUS)
416                 /* Opus requires a fixed 48kHz clock */
417                 avpriv_set_pts_info(st, 64, 1, 48000);
418             else
419                 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
420         } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
421             avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
422         if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
423             st->codec->codec_id != AV_CODEC_ID_THEORA &&
424             st->codec->codec_id != AV_CODEC_ID_SPEEX  &&
425             st->codec->codec_id != AV_CODEC_ID_FLAC   &&
426             st->codec->codec_id != AV_CODEC_ID_OPUS) {
427             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
428             return -1;
429         }
430
431         if (!st->codec->extradata || !st->codec->extradata_size) {
432             av_log(s, AV_LOG_ERROR, "No extradata present\n");
433             return -1;
434         }
435         oggstream = av_mallocz(sizeof(*oggstream));
436         oggstream->page.stream_index = i;
437
438         if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
439             do {
440                 serial_num = av_get_random_seed();
441                 for (j = 0; j < i; j++) {
442                     OGGStreamContext *sc = s->streams[j]->priv_data;
443                     if (serial_num == sc->serial_num)
444                         break;
445                 }
446             } while (j < i);
447         oggstream->serial_num = serial_num;
448
449         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
450
451         st->priv_data = oggstream;
452         if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
453             int err = ogg_build_flac_headers(st->codec, oggstream,
454                                              st->codec->flags & CODEC_FLAG_BITEXACT,
455                                              &st->metadata);
456             if (err) {
457                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
458                 av_freep(&st->priv_data);
459                 return err;
460             }
461         } else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
462             int err = ogg_build_speex_headers(st->codec, oggstream,
463                                               st->codec->flags & CODEC_FLAG_BITEXACT,
464                                               &st->metadata);
465             if (err) {
466                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
467                 av_freep(&st->priv_data);
468                 return err;
469             }
470         } else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
471             int err = ogg_build_opus_headers(st->codec, oggstream,
472                                              st->codec->flags & CODEC_FLAG_BITEXACT,
473                                              &st->metadata);
474             if (err) {
475                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
476                 av_freep(&st->priv_data);
477                 return err;
478             }
479         } else {
480             uint8_t *p;
481             const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
482             int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
483             int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
484
485             if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
486                                       st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
487                                       oggstream->header, oggstream->header_len) < 0) {
488                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
489                 av_freep(&st->priv_data);
490                 return -1;
491             }
492
493             p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
494                                         &oggstream->header_len[1], &st->metadata,
495                                         framing_bit);
496             oggstream->header[1] = p;
497             if (!p)
498                 return AVERROR(ENOMEM);
499
500             bytestream_put_byte(&p, header_type);
501             bytestream_put_buffer(&p, cstr, 6);
502
503             if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
504                 /** KFGSHIFT is the width of the less significant section of the granule position
505                     The less significant section is the frame count since the last keyframe */
506                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
507                 oggstream->vrev = oggstream->header[0][9];
508                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
509                        oggstream->kfgshift, oggstream->vrev);
510             }
511         }
512     }
513
514     for (j = 0; j < s->nb_streams; j++) {
515         OGGStreamContext *oggstream = s->streams[j]->priv_data;
516         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
517                         oggstream->header_len[0], 0, 1);
518         oggstream->page.flags |= 2; // bos
519         ogg_buffer_page(s, oggstream);
520     }
521     for (j = 0; j < s->nb_streams; j++) {
522         AVStream *st = s->streams[j];
523         OGGStreamContext *oggstream = st->priv_data;
524         for (i = 1; i < 3; i++) {
525             if (oggstream->header_len[i])
526                 ogg_buffer_data(s, st, oggstream->header[i],
527                                 oggstream->header_len[i], 0, 1);
528         }
529         ogg_buffer_page(s, oggstream);
530     }
531
532     oggstream->page.start_granule = AV_NOPTS_VALUE;
533
534     return 0;
535 }
536
537 static void ogg_write_pages(AVFormatContext *s, int flush)
538 {
539     OGGContext *ogg = s->priv_data;
540     OGGPageList *next, *p;
541
542     if (!ogg->page_list)
543         return;
544
545     for (p = ogg->page_list; p; ) {
546         OGGStreamContext *oggstream =
547             s->streams[p->page.stream_index]->priv_data;
548         if (oggstream->page_count < 2 && !flush)
549             break;
550         ogg_write_page(s, &p->page,
551                        flush && oggstream->page_count == 1 ? 4 : 0); // eos
552         next = p->next;
553         av_freep(&p);
554         p = next;
555     }
556     ogg->page_list = p;
557 }
558
559 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
560 {
561     AVStream *st = s->streams[pkt->stream_index];
562     OGGStreamContext *oggstream = st->priv_data;
563     int ret;
564     int64_t granule;
565
566     if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
567         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
568         int pframe_count;
569         if (pkt->flags & AV_PKT_FLAG_KEY)
570             oggstream->last_kf_pts = pts;
571         pframe_count = pts - oggstream->last_kf_pts;
572         // prevent frame count from overflow if key frame flag is not set
573         if (pframe_count >= (1<<oggstream->kfgshift)) {
574             oggstream->last_kf_pts += pframe_count;
575             pframe_count = 0;
576         }
577         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
578     } else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
579         granule = pkt->pts + pkt->duration + av_rescale_q(st->codec->delay, (AVRational){ 1, st->codec->sample_rate }, st->time_base);
580     else
581         granule = pkt->pts + pkt->duration;
582
583     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
584         oggstream->page.start_granule = pkt->pts;
585
586     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
587     if (ret < 0)
588         return ret;
589
590     ogg_write_pages(s, 0);
591
592     oggstream->last_granule = granule;
593
594     return 0;
595 }
596
597 static int ogg_write_trailer(AVFormatContext *s)
598 {
599     int i;
600
601     /* flush current page if needed */
602     for (i = 0; i < s->nb_streams; i++) {
603         OGGStreamContext *oggstream = s->streams[i]->priv_data;
604
605         if (oggstream->page.size > 0)
606             ogg_buffer_page(s, oggstream);
607     }
608
609     ogg_write_pages(s, 1);
610
611     for (i = 0; i < s->nb_streams; i++) {
612         AVStream *st = s->streams[i];
613         OGGStreamContext *oggstream = st->priv_data;
614         if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
615             st->codec->codec_id == AV_CODEC_ID_SPEEX ||
616             st->codec->codec_id == AV_CODEC_ID_OPUS) {
617             av_freep(&oggstream->header[0]);
618         }
619         av_freep(&oggstream->header[1]);
620         av_freep(&st->priv_data);
621     }
622     return 0;
623 }
624
625 AVOutputFormat ff_ogg_muxer = {
626     .name              = "ogg",
627     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
628     .mime_type         = "application/ogg",
629     .extensions        = "ogg,ogv,spx,opus",
630     .priv_data_size    = sizeof(OGGContext),
631     .audio_codec       = AV_CODEC_ID_FLAC,
632     .video_codec       = AV_CODEC_ID_THEORA,
633     .write_header      = ogg_write_header,
634     .write_packet      = ogg_write_packet,
635     .write_trailer     = ogg_write_trailer,
636     .flags             = AVFMT_TS_NEGATIVE,
637     .priv_class        = &ogg_muxer_class,
638 };