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