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 <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;
  41     int stream_index;
  42     uint8_t flags;
  43     uint8_t segments_count;
  44     uint8_t segments[255];
  45     uint8_t data[MAX_PAGE_SIZE];
  46     uint16_t size;
  47 } OGGPage;
  48
  49 typedef struct {
  50     unsigned page_counter;
  51     uint8_t *header[3];
  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
  62 } OGGStreamContext;
  63
  64 typedef struct OGGPageList {
  65     OGGPage page;
  66     struct OGGPageList *next;
  67 } OGGPageList;
  68
  69 typedef struct {
  70     const AVClass *class;
  71     OGGPageList *page_list;
  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     { "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_INT, { .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 int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 143 {
 144     if (oggstream->kfgshift)
 145         return (granule>>oggstream->kfgshift) +
 146             (granule & ((1<<oggstream->kfgshift)-1));
 147     else
 148         return granule;
 149 }
 150
 151 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 152 {
 153     AVStream *st2 = s->streams[next->stream_index];
 154     AVStream *st  = s->streams[page->stream_index];
 155     int64_t next_granule, cur_granule;
 156
 157     if (next->granule == -1 || page->granule == -1)
 158         return 0;
 159
 160     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 161                                 st2->time_base, AV_TIME_BASE_Q);
 162     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 163                                 st ->time_base, AV_TIME_BASE_Q);
 164     return next_granule > cur_granule;
 165 }
 166
 167 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 168 {
 169     oggstream->page.granule = -1;
 170     oggstream->page.flags = 0;
 171     oggstream->page.segments_count = 0;
 172     oggstream->page.size = 0;
 173     return 0;
 174 }
 175
 176 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 177 {
 178     OGGContext *ogg = s->priv_data;
 179     OGGPageList **p = &ogg->page_list;
 180     OGGPageList *l = av_mallocz(sizeof(*l));
 181
 182     if (!l)
 183         return AVERROR(ENOMEM);
 184     l->page = oggstream->page;
 185
 186     oggstream->page.start_granule = oggstream->page.granule;
 187     oggstream->page_count++;
 188     ogg_reset_cur_page(oggstream);
 189
 190     while (*p) {
 191         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 192             break;
 193         p = &(*p)->next;
 194     }
 195     l->next = *p;
 196     *p = l;
 197
 198     return 0;
 199 }
 200
 201 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 202                            uint8_t *data, unsigned size, int64_t granule,
 203                            int header)
 204 {
 205     OGGStreamContext *oggstream = st->priv_data;
 206     OGGContext *ogg = s->priv_data;
 207     int total_segments = size / 255 + 1;
 208     uint8_t *p = data;
 209     int i, segments, len, flush = 0;
 210
 211     // Handles VFR by flushing page because this frame needs to have a timestamp
 212     if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
 213         ogg_granule_to_timestamp(oggstream, granule) >
 214         ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) {
 215         if (oggstream->page.granule != -1)
 216             ogg_buffer_page(s, oggstream);
 217         flush = 1;
 218     }
 219
 220     // avoid a continued page
 221     if (!header && oggstream->page.size > 0 &&
 222         MAX_PAGE_SIZE - oggstream->page.size < size) {
 223         ogg_buffer_page(s, oggstream);
 224     }
 225
 226     for (i = 0; i < total_segments; ) {
 227         OGGPage *page = &oggstream->page;
 228
 229         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 230
 231         if (i && !page->segments_count)
 232             page->flags |= 1; // continued packet
 233
 234         memset(page->segments+page->segments_count, 255, segments - 1);
 235         page->segments_count += segments - 1;
 236
 237         len = FFMIN(size, segments*255);
 238         page->segments[page->segments_count++] = len - (segments-1)*255;
 239         memcpy(page->data+page->size, p, len);
 240         p += len;
 241         size -= len;
 242         i += segments;
 243         page->size += len;
 244
 245         if (i == total_segments)
 246             page->granule = granule;
 247
 248         if (!header) {
 249             AVStream *st = s->streams[page->stream_index];
 250
 251             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 252                                          AV_TIME_BASE_Q);
 253             int64_t next  = av_rescale_q(page->granule, st->time_base,
 254                                          AV_TIME_BASE_Q);
 255
 256             if (page->segments_count == 255 ||
 257                 (ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
 258                 (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
 259                 ogg_buffer_page(s, oggstream);
 260             }
 261         }
 262     }
 263
 264     if (flush && oggstream->page.granule != -1)
 265         ogg_buffer_page(s, oggstream);
 266
 267     return 0;
 268 }
 269
 270 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
 271                                         int *header_len, AVDictionary **m, int framing_bit)
 272 {
 273     const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
 274     int size;
 275     uint8_t *p, *p0;
 276     unsigned int count;
 277
 278     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 279
 280     size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
 281     p = av_mallocz(size);
 282     if (!p)
 283         return NULL;
 284     p0 = p;
 285
 286     p += offset;
 287     ff_vorbiscomment_write(&p, m, vendor, count);
 288     if (framing_bit)
 289         bytestream_put_byte(&p, 1);
 290
 291     *header_len = size;
 292     return p0;
 293 }
 294
 295 static int ogg_build_flac_headers(AVCodecContext *avctx,
 296                                   OGGStreamContext *oggstream, int bitexact,
 297                                   AVDictionary **m)
 298 {
 299     enum FLACExtradataFormat format;
 300     uint8_t *streaminfo;
 301     uint8_t *p;
 302
 303     if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
 304         return -1;
 305
 306     // first packet: STREAMINFO
 307     oggstream->header_len[0] = 51;
 308     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
 309     p = oggstream->header[0];
 310     if (!p)
 311         return AVERROR(ENOMEM);
 312     bytestream_put_byte(&p, 0x7F);
 313     bytestream_put_buffer(&p, "FLAC", 4);
 314     bytestream_put_byte(&p, 1); // major version
 315     bytestream_put_byte(&p, 0); // minor version
 316     bytestream_put_be16(&p, 1); // headers packets without this one
 317     bytestream_put_buffer(&p, "fLaC", 4);
 318     bytestream_put_byte(&p, 0x00); // streaminfo
 319     bytestream_put_be24(&p, 34);
 320     bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
 321
 322     // second packet: VorbisComment
 323     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
 324     if (!p)
 325         return AVERROR(ENOMEM);
 326     oggstream->header[1] = p;
 327     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
 328     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
 329
 330     return 0;
 331 }
 332
 333 #define SPEEX_HEADER_SIZE 80
 334
 335 static int ogg_build_speex_headers(AVCodecContext *avctx,
 336                                    OGGStreamContext *oggstream, int bitexact,
 337                                    AVDictionary **m)
 338 {
 339     uint8_t *p;
 340
 341     if (avctx->extradata_size < SPEEX_HEADER_SIZE)
 342         return -1;
 343
 344     // first packet: Speex header
 345     p = av_mallocz(SPEEX_HEADER_SIZE);
 346     if (!p)
 347         return AVERROR(ENOMEM);
 348     oggstream->header[0] = p;
 349     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
 350     bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
 351     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
 352
 353     // second packet: VorbisComment
 354     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
 355     if (!p)
 356         return AVERROR(ENOMEM);
 357     oggstream->header[1] = p;
 358
 359     return 0;
 360 }
 361
 362 #define OPUS_HEADER_SIZE 19
 363
 364 static int ogg_build_opus_headers(AVCodecContext *avctx,
 365                                   OGGStreamContext *oggstream, int bitexact,
 366                                   AVDictionary **m)
 367 {
 368     uint8_t *p;
 369
 370     if (avctx->extradata_size < OPUS_HEADER_SIZE)
 371         return -1;
 372
 373     /* first packet: Opus header */
 374     p = av_mallocz(avctx->extradata_size);
 375     if (!p)
 376         return AVERROR(ENOMEM);
 377     oggstream->header[0] = p;
 378     oggstream->header_len[0] = avctx->extradata_size;
 379     bytestream_put_buffer(&p, avctx->extradata, avctx->extradata_size);
 380
 381     /* second packet: VorbisComment */
 382     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
 383     if (!p)
 384         return AVERROR(ENOMEM);
 385     oggstream->header[1] = p;
 386     bytestream_put_buffer(&p, "OpusTags", 8);
 387
 388     return 0;
 389 }
 390
 391 static int ogg_write_header(AVFormatContext *s)
 392 {
 393     OGGContext *ogg = s->priv_data;
 394     OGGStreamContext *oggstream;
 395     int i, j;
 396
 397     if (ogg->pref_size)
 398         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
 399
 400     for (i = 0; i < s->nb_streams; i++) {
 401         AVStream *st = s->streams[i];
 402         unsigned serial_num = i;
 403
 404         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 405             if (st->codec->codec_id == AV_CODEC_ID_OPUS)
 406                 /* Opus requires a fixed 48kHz clock */
 407                 avpriv_set_pts_info(st, 64, 1, 48000);
 408             else
 409                 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
 410         else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 411             avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
 412         if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
 413             st->codec->codec_id != AV_CODEC_ID_THEORA &&
 414             st->codec->codec_id != AV_CODEC_ID_SPEEX  &&
 415             st->codec->codec_id != AV_CODEC_ID_FLAC   &&
 416             st->codec->codec_id != AV_CODEC_ID_OPUS) {
 417             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 418             return -1;
 419         }
 420
 421         if (!st->codec->extradata || !st->codec->extradata_size) {
 422             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 423             return -1;
 424         }
 425         oggstream = av_mallocz(sizeof(*oggstream));
 426         oggstream->page.stream_index = i;
 427
 428         if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
 429             do {
 430                 serial_num = av_get_random_seed();
 431                 for (j = 0; j < i; j++) {
 432                     OGGStreamContext *sc = s->streams[j]->priv_data;
 433                     if (serial_num == sc->serial_num)
 434                         break;
 435                 }
 436             } while (j < i);
 437         oggstream->serial_num = serial_num;
 438
 439         st->priv_data = oggstream;
 440         if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
 441             int err = ogg_build_flac_headers(st->codec, oggstream,
 442                                              st->codec->flags & CODEC_FLAG_BITEXACT,
 443                                              &s->metadata);
 444             if (err) {
 445                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
 446                 av_freep(&st->priv_data);
 447                 return err;
 448             }
 449         } else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
 450             int err = ogg_build_speex_headers(st->codec, oggstream,
 451                                               st->codec->flags & CODEC_FLAG_BITEXACT,
 452                                               &s->metadata);
 453             if (err) {
 454                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 455                 av_freep(&st->priv_data);
 456                 return err;
 457             }
 458         } else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
 459             int err = ogg_build_opus_headers(st->codec, oggstream,
 460                                              st->codec->flags & CODEC_FLAG_BITEXACT,
 461                                              &s->metadata);
 462             if (err) {
 463                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 464                 av_freep(&st->priv_data);
 465                 return err;
 466             }
 467         } else {
 468             uint8_t *p;
 469             const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 470             int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 471             int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 472
 473             if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
 474                                       st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 475                                       oggstream->header, oggstream->header_len) < 0) {
 476                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 477                 av_freep(&st->priv_data);
 478                 return -1;
 479             }
 480
 481             p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
 482                                         &oggstream->header_len[1], &s->metadata,
 483                                         framing_bit);
 484             oggstream->header[1] = p;
 485             if (!p)
 486                 return AVERROR(ENOMEM);
 487
 488             bytestream_put_byte(&p, header_type);
 489             bytestream_put_buffer(&p, cstr, 6);
 490
 491             if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
 492                 /** KFGSHIFT is the width of the less significant section of the granule position
 493                     The less significant section is the frame count since the last keyframe */
 494                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 495                 oggstream->vrev = oggstream->header[0][9];
 496                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 497                        oggstream->kfgshift, oggstream->vrev);
 498             }
 499         }
 500     }
 501
 502     for (j = 0; j < s->nb_streams; j++) {
 503         OGGStreamContext *oggstream = s->streams[j]->priv_data;
 504         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 505                         oggstream->header_len[0], 0, 1);
 506         oggstream->page.flags |= 2; // bos
 507         ogg_buffer_page(s, oggstream);
 508     }
 509     for (j = 0; j < s->nb_streams; j++) {
 510         AVStream *st = s->streams[j];
 511         OGGStreamContext *oggstream = st->priv_data;
 512         for (i = 1; i < 3; i++) {
 513             if (oggstream && oggstream->header_len[i])
 514                 ogg_buffer_data(s, st, oggstream->header[i],
 515                                 oggstream->header_len[i], 0, 1);
 516         }
 517         ogg_buffer_page(s, oggstream);
 518     }
 519
 520     oggstream->page.start_granule = AV_NOPTS_VALUE;
 521
 522     return 0;
 523 }
 524
 525 static void ogg_write_pages(AVFormatContext *s, int flush)
 526 {
 527     OGGContext *ogg = s->priv_data;
 528     OGGPageList *next, *p;
 529
 530     if (!ogg->page_list)
 531         return;
 532
 533     for (p = ogg->page_list; p; ) {
 534         OGGStreamContext *oggstream =
 535             s->streams[p->page.stream_index]->priv_data;
 536         if (oggstream->page_count < 2 && !flush)
 537             break;
 538         ogg_write_page(s, &p->page,
 539                        flush && oggstream->page_count == 1 ? 4 : 0); // eos
 540         next = p->next;
 541         av_freep(&p);
 542         p = next;
 543     }
 544     ogg->page_list = p;
 545 }
 546
 547 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 548 {
 549     AVStream *st = s->streams[pkt->stream_index];
 550     OGGStreamContext *oggstream = st->priv_data;
 551     int ret;
 552     int64_t granule;
 553
 554     if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
 555         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 556         int pframe_count;
 557         if (pkt->flags & AV_PKT_FLAG_KEY)
 558             oggstream->last_kf_pts = pts;
 559         pframe_count = pts - oggstream->last_kf_pts;
 560         // prevent frame count from overflow if key frame flag is not set
 561         if (pframe_count >= (1<<oggstream->kfgshift)) {
 562             oggstream->last_kf_pts += pframe_count;
 563             pframe_count = 0;
 564         }
 565         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 566     } else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
 567         granule = pkt->pts + pkt->duration + av_rescale_q(st->codec->delay, (AVRational){ 1, st->codec->sample_rate }, st->time_base);
 568     else
 569         granule = pkt->pts + pkt->duration;
 570
 571     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 572         oggstream->page.start_granule = pkt->pts;
 573
 574     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 575     if (ret < 0)
 576         return ret;
 577
 578     ogg_write_pages(s, 0);
 579
 580     oggstream->last_granule = granule;
 581
 582     return 0;
 583 }
 584
 585 static int ogg_write_trailer(AVFormatContext *s)
 586 {
 587     int i;
 588
 589     /* flush current page if needed */
 590     for (i = 0; i < s->nb_streams; i++) {
 591         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 592
 593         if (oggstream->page.size > 0)
 594             ogg_buffer_page(s, oggstream);
 595     }
 596
 597     ogg_write_pages(s, 1);
 598
 599     for (i = 0; i < s->nb_streams; i++) {
 600         AVStream *st = s->streams[i];
 601         OGGStreamContext *oggstream = st->priv_data;
 602         if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
 603             st->codec->codec_id == AV_CODEC_ID_SPEEX ||
 604             st->codec->codec_id == AV_CODEC_ID_OPUS) {
 605             av_free(oggstream->header[0]);
 606         }
 607         av_freep(&oggstream->header[1]);
 608         av_freep(&st->priv_data);
 609     }
 610     return 0;
 611 }
 612
 613 AVOutputFormat ff_ogg_muxer = {
 614     .name              = "ogg",
 615     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
 616     .mime_type         = "application/ogg",
 617     .extensions        = "ogg,ogv,spx,opus",
 618     .priv_data_size    = sizeof(OGGContext),
 619     .audio_codec       = AV_CODEC_ID_FLAC,
 620     .video_codec       = AV_CODEC_ID_THEORA,
 621     .write_header      = ogg_write_header,
 622     .write_packet      = ogg_write_packet,
 623     .write_trailer     = ogg_write_trailer,
 624     .flags             = AVFMT_TS_NEGATIVE,
 625     .priv_class        = &ogg_muxer_class,
 626 };