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 OGGPage {
  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 OGGStreamContext {
  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 OGGContext {
  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     int serial_offset;
  75 } OGGContext;
  76
  77 #define OFFSET(x) offsetof(OGGContext, x)
  78 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
  79
  80 static const AVOption options[] = {
  81     { "serial_offset", "serial number offset",
  82         OFFSET(serial_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, PARAM },
  83     { "pagesize", "preferred page size in bytes (deprecated)",
  84         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
  85     { "page_duration", "preferred page duration, in microseconds",
  86         OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
  87     { NULL },
  88 };
  89
  90 #define OGG_CLASS(flavor)\
  91 static const AVClass flavor ## _muxer_class = {\
  92     .class_name = #flavor " muxer",\
  93     .item_name  = av_default_item_name,\
  94     .option     = options,\
  95     .version    = LIBAVUTIL_VERSION_INT,\
  96 };
  97
  98 static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
  99 {
 100     int64_t pos = avio_tell(pb);
 101     uint32_t checksum = ffio_get_checksum(pb);
 102     avio_seek(pb, crc_offset, SEEK_SET);
 103     avio_wb32(pb, checksum);
 104     avio_seek(pb, pos, SEEK_SET);
 105 }
 106
 107 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
 108 {
 109     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
 110     AVIOContext *pb;
 111     int64_t crc_offset;
 112     int ret, size;
 113     uint8_t *buf;
 114
 115     ret = avio_open_dyn_buf(&pb);
 116     if (ret < 0)
 117         return ret;
 118     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
 119     ffio_wfourcc(pb, "OggS");
 120     avio_w8(pb, 0);
 121     avio_w8(pb, page->flags | extra_flags);
 122     avio_wl64(pb, page->granule);
 123     avio_wl32(pb, oggstream->serial_num);
 124     avio_wl32(pb, oggstream->page_counter++);
 125     crc_offset = avio_tell(pb);
 126     avio_wl32(pb, 0); // crc
 127     avio_w8(pb, page->segments_count);
 128     avio_write(pb, page->segments, page->segments_count);
 129     avio_write(pb, page->data, page->size);
 130
 131     ogg_update_checksum(s, pb, crc_offset);
 132     avio_flush(pb);
 133
 134     size = avio_close_dyn_buf(pb, &buf);
 135     if (size < 0)
 136         return size;
 137
 138     avio_write(s->pb, buf, size);
 139     avio_flush(s->pb);
 140     av_free(buf);
 141     oggstream->page_count--;
 142     return 0;
 143 }
 144
 145 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 146 {
 147     if (oggstream->kfgshift)
 148         return (granule>>oggstream->kfgshift) +
 149             (granule & ((1<<oggstream->kfgshift)-1));
 150     else
 151         return granule;
 152 }
 153
 154 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 155 {
 156     AVStream *st2 = s->streams[next->stream_index];
 157     AVStream *st  = s->streams[page->stream_index];
 158     int64_t next_granule, cur_granule;
 159
 160     if (next->granule == -1 || page->granule == -1)
 161         return 0;
 162
 163     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 164                                 st2->time_base, AV_TIME_BASE_Q);
 165     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 166                                 st ->time_base, AV_TIME_BASE_Q);
 167     return next_granule > cur_granule;
 168 }
 169
 170 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 171 {
 172     oggstream->page.granule = -1;
 173     oggstream->page.flags = 0;
 174     oggstream->page.segments_count = 0;
 175     oggstream->page.size = 0;
 176     return 0;
 177 }
 178
 179 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 180 {
 181     OGGContext *ogg = s->priv_data;
 182     OGGPageList **p = &ogg->page_list;
 183     OGGPageList *l = av_mallocz(sizeof(*l));
 184
 185     if (!l)
 186         return AVERROR(ENOMEM);
 187     l->page = oggstream->page;
 188
 189     oggstream->page.start_granule = oggstream->page.granule;
 190     oggstream->page_count++;
 191     ogg_reset_cur_page(oggstream);
 192
 193     while (*p) {
 194         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 195             break;
 196         p = &(*p)->next;
 197     }
 198     l->next = *p;
 199     *p = l;
 200
 201     return 0;
 202 }
 203
 204 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 205                            uint8_t *data, unsigned size, int64_t granule,
 206                            int header)
 207 {
 208     OGGStreamContext *oggstream = st->priv_data;
 209     OGGContext *ogg = s->priv_data;
 210     int total_segments = size / 255 + 1;
 211     uint8_t *p = data;
 212     int i, segments, len, flush = 0;
 213
 214     // Handles VFR by flushing page because this frame needs to have a timestamp
 215     if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
 216         ogg_granule_to_timestamp(oggstream, granule) >
 217         ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) {
 218         if (oggstream->page.granule != -1)
 219             ogg_buffer_page(s, oggstream);
 220         flush = 1;
 221     }
 222
 223     // avoid a continued page
 224     if (!header && oggstream->page.size > 0 &&
 225         MAX_PAGE_SIZE - oggstream->page.size < size) {
 226         ogg_buffer_page(s, oggstream);
 227     }
 228
 229     for (i = 0; i < total_segments; ) {
 230         OGGPage *page = &oggstream->page;
 231
 232         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 233
 234         if (i && !page->segments_count)
 235             page->flags |= 1; // continued packet
 236
 237         memset(page->segments+page->segments_count, 255, segments - 1);
 238         page->segments_count += segments - 1;
 239
 240         len = FFMIN(size, segments*255);
 241         page->segments[page->segments_count++] = len - (segments-1)*255;
 242         memcpy(page->data+page->size, p, len);
 243         p += len;
 244         size -= len;
 245         i += segments;
 246         page->size += len;
 247
 248         if (i == total_segments)
 249             page->granule = granule;
 250
 251         if (!header) {
 252             AVStream *st = s->streams[page->stream_index];
 253
 254             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 255                                          AV_TIME_BASE_Q);
 256             int64_t next  = av_rescale_q(page->granule, st->time_base,
 257                                          AV_TIME_BASE_Q);
 258
 259             if (page->segments_count == 255 ||
 260                 (ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
 261                 (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
 262                 ogg_buffer_page(s, oggstream);
 263             }
 264         }
 265     }
 266
 267     if (flush && oggstream->page.granule != -1)
 268         ogg_buffer_page(s, oggstream);
 269
 270     return 0;
 271 }
 272
 273 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
 274                                         int *header_len, AVDictionary **m, int framing_bit)
 275 {
 276     const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
 277     int size;
 278     uint8_t *p, *p0;
 279
 280     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 281
 282     size = offset + ff_vorbiscomment_length(*m, vendor) + framing_bit;
 283     p = av_mallocz(size);
 284     if (!p)
 285         return NULL;
 286     p0 = p;
 287
 288     p += offset;
 289     ff_vorbiscomment_write(&p, m, vendor);
 290     if (framing_bit)
 291         bytestream_put_byte(&p, 1);
 292
 293     *header_len = size;
 294     return p0;
 295 }
 296
 297 static int ogg_build_flac_headers(AVCodecContext *avctx,
 298                                   OGGStreamContext *oggstream, int bitexact,
 299                                   AVDictionary **m)
 300 {
 301     uint8_t *p;
 302
 303     if (avctx->extradata_size < FLAC_STREAMINFO_SIZE)
 304         return AVERROR(EINVAL);
 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, avctx->extradata, 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 void ogg_write_pages(AVFormatContext *s, int flush)
 392 {
 393     OGGContext *ogg = s->priv_data;
 394     OGGPageList *next, *p;
 395
 396     if (!ogg->page_list)
 397         return;
 398
 399     for (p = ogg->page_list; p; ) {
 400         OGGStreamContext *oggstream =
 401             s->streams[p->page.stream_index]->priv_data;
 402         if (oggstream->page_count < 2 && !flush)
 403             break;
 404         ogg_write_page(s, &p->page,
 405                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
 406         next = p->next;
 407         av_freep(&p);
 408         p = next;
 409     }
 410     ogg->page_list = p;
 411 }
 412
 413 static int ogg_write_header(AVFormatContext *s)
 414 {
 415     OGGContext *ogg = s->priv_data;
 416     OGGStreamContext *oggstream;
 417     int i, j;
 418
 419     if (ogg->pref_size)
 420         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
 421
 422     for (i = 0; i < s->nb_streams; i++) {
 423         AVStream *st = s->streams[i];
 424         unsigned serial_num = i + ogg->serial_offset;
 425
 426         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
 427             if (st->codec->codec_id == AV_CODEC_ID_OPUS)
 428                 /* Opus requires a fixed 48kHz clock */
 429                 avpriv_set_pts_info(st, 64, 1, 48000);
 430             else
 431                 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
 432
 433         if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
 434             st->codec->codec_id != AV_CODEC_ID_THEORA &&
 435             st->codec->codec_id != AV_CODEC_ID_SPEEX  &&
 436             st->codec->codec_id != AV_CODEC_ID_FLAC   &&
 437             st->codec->codec_id != AV_CODEC_ID_OPUS) {
 438             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 439             return -1;
 440         }
 441
 442         if (!st->codec->extradata || !st->codec->extradata_size) {
 443             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 444             return -1;
 445         }
 446         oggstream = av_mallocz(sizeof(*oggstream));
 447         if (!oggstream)
 448             return AVERROR(ENOMEM);
 449         oggstream->page.stream_index = i;
 450
 451         if (!(s->flags & AVFMT_FLAG_BITEXACT))
 452             do {
 453                 serial_num = av_get_random_seed();
 454                 for (j = 0; j < i; j++) {
 455                     OGGStreamContext *sc = s->streams[j]->priv_data;
 456                     if (serial_num == sc->serial_num)
 457                         break;
 458                 }
 459             } while (j < i);
 460         oggstream->serial_num = serial_num;
 461
 462         st->priv_data = oggstream;
 463         if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
 464             int err = ogg_build_flac_headers(st->codec, oggstream,
 465                                              s->flags & AVFMT_FLAG_BITEXACT,
 466                                              &s->metadata);
 467             if (err) {
 468                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
 469                 av_freep(&st->priv_data);
 470                 return err;
 471             }
 472         } else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
 473             int err = ogg_build_speex_headers(st->codec, oggstream,
 474                                               s->flags & AVFMT_FLAG_BITEXACT,
 475                                               &s->metadata);
 476             if (err) {
 477                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 478                 av_freep(&st->priv_data);
 479                 return err;
 480             }
 481         } else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
 482             int err = ogg_build_opus_headers(st->codec, oggstream,
 483                                              s->flags & AVFMT_FLAG_BITEXACT,
 484                                              &s->metadata);
 485             if (err) {
 486                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 487                 av_freep(&st->priv_data);
 488                 return err;
 489             }
 490         } else {
 491             uint8_t *p;
 492             const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 493             int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 494             int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 495
 496             if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
 497                                       st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 498                                       oggstream->header, oggstream->header_len) < 0) {
 499                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 500                 av_freep(&st->priv_data);
 501                 return -1;
 502             }
 503
 504             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
 505                                         &oggstream->header_len[1], &s->metadata,
 506                                         framing_bit);
 507             oggstream->header[1] = p;
 508             if (!p)
 509                 return AVERROR(ENOMEM);
 510
 511             bytestream_put_byte(&p, header_type);
 512             bytestream_put_buffer(&p, cstr, 6);
 513
 514             if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
 515                 /** KFGSHIFT is the width of the less significant section of the granule position
 516                     The less significant section is the frame count since the last keyframe */
 517                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 518                 oggstream->vrev = oggstream->header[0][9];
 519                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 520                        oggstream->kfgshift, oggstream->vrev);
 521             }
 522         }
 523     }
 524
 525     for (j = 0; j < s->nb_streams; j++) {
 526         OGGStreamContext *oggstream = s->streams[j]->priv_data;
 527         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 528                         oggstream->header_len[0], 0, 1);
 529         oggstream->page.flags |= 2; // bos
 530         ogg_buffer_page(s, oggstream);
 531     }
 532     for (j = 0; j < s->nb_streams; j++) {
 533         AVStream *st = s->streams[j];
 534         OGGStreamContext *oggstream = st->priv_data;
 535         for (i = 1; i < 3; i++) {
 536             if (oggstream->header_len[i])
 537                 ogg_buffer_data(s, st, oggstream->header[i],
 538                                 oggstream->header_len[i], 0, 1);
 539         }
 540         ogg_buffer_page(s, oggstream);
 541     }
 542
 543     oggstream->page.start_granule = AV_NOPTS_VALUE;
 544
 545     ogg_write_pages(s, 2);
 546
 547     return 0;
 548 }
 549
 550 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 551 {
 552     AVStream *st = s->streams[pkt->stream_index];
 553     OGGStreamContext *oggstream = st->priv_data;
 554     int ret;
 555     int64_t granule;
 556
 557     if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
 558         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 559         int pframe_count;
 560         if (pkt->flags & AV_PKT_FLAG_KEY)
 561             oggstream->last_kf_pts = pts;
 562         pframe_count = pts - oggstream->last_kf_pts;
 563         // prevent frame count from overflow if key frame flag is not set
 564         if (pframe_count >= (1<<oggstream->kfgshift)) {
 565             oggstream->last_kf_pts += pframe_count;
 566             pframe_count = 0;
 567         }
 568         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 569     } else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
 570         granule = pkt->pts + pkt->duration +
 571                   av_rescale_q(st->codec->initial_padding,
 572                                (AVRational){ 1, st->codec->sample_rate },
 573                                st->time_base);
 574     else
 575         granule = pkt->pts + pkt->duration;
 576
 577     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 578         oggstream->page.start_granule = pkt->pts;
 579
 580     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 581     if (ret < 0)
 582         return ret;
 583
 584     ogg_write_pages(s, 0);
 585
 586     oggstream->last_granule = granule;
 587
 588     return 0;
 589 }
 590
 591 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 592 {
 593     int i;
 594
 595     if (pkt)
 596         return ogg_write_packet_internal(s, pkt);
 597
 598     for (i = 0; i < s->nb_streams; i++) {
 599         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 600         if (oggstream->page.segments_count)
 601             ogg_buffer_page(s, oggstream);
 602     }
 603
 604     ogg_write_pages(s, 2);
 605     return 0;
 606 }
 607
 608 static int ogg_write_trailer(AVFormatContext *s)
 609 {
 610     int i;
 611
 612     /* flush current page if needed */
 613     for (i = 0; i < s->nb_streams; i++) {
 614         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 615
 616         if (oggstream->page.size > 0)
 617             ogg_buffer_page(s, oggstream);
 618     }
 619
 620     ogg_write_pages(s, 1);
 621
 622     for (i = 0; i < s->nb_streams; i++) {
 623         AVStream *st = s->streams[i];
 624         OGGStreamContext *oggstream = st->priv_data;
 625         if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
 626             st->codec->codec_id == AV_CODEC_ID_SPEEX ||
 627             st->codec->codec_id == AV_CODEC_ID_OPUS) {
 628             av_free(oggstream->header[0]);
 629         }
 630         av_freep(&oggstream->header[1]);
 631         av_freep(&st->priv_data);
 632     }
 633     return 0;
 634 }
 635
 636 #if CONFIG_OGG_MUXER
 637 OGG_CLASS(ogg)
 638 AVOutputFormat ff_ogg_muxer = {
 639     .name              = "ogg",
 640     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
 641     .mime_type         = "application/ogg",
 642     .extensions        = "ogg,ogv",
 643     .priv_data_size    = sizeof(OGGContext),
 644     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 645                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 646     .video_codec       = AV_CODEC_ID_THEORA,
 647     .write_header      = ogg_write_header,
 648     .write_packet      = ogg_write_packet,
 649     .write_trailer     = ogg_write_trailer,
 650     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 651     .priv_class        = &ogg_muxer_class,
 652 };
 653 #endif
 654
 655 #if CONFIG_OGA_MUXER
 656 OGG_CLASS(oga)
 657 AVOutputFormat ff_oga_muxer = {
 658     .name              = "oga",
 659     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Audio"),
 660     .mime_type         = "audio/ogg",
 661     .extensions        = "oga",
 662     .priv_data_size    = sizeof(OGGContext),
 663     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 664                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 665     .write_header      = ogg_write_header,
 666     .write_packet      = ogg_write_packet,
 667     .write_trailer     = ogg_write_trailer,
 668     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 669     .priv_class        = &oga_muxer_class,
 670 };
 671 #endif
 672
 673 #if CONFIG_SPX_MUXER
 674 OGG_CLASS(spx)
 675 AVOutputFormat ff_spx_muxer = {
 676     .name              = "spx",
 677     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Speex"),
 678     .mime_type         = "audio/ogg",
 679     .extensions        = "spx",
 680     .priv_data_size    = sizeof(OGGContext),
 681     .audio_codec       = AV_CODEC_ID_SPEEX,
 682     .write_header      = ogg_write_header,
 683     .write_packet      = ogg_write_packet,
 684     .write_trailer     = ogg_write_trailer,
 685     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 686     .priv_class        = &spx_muxer_class,
 687 };
 688 #endif
 689
 690 #if CONFIG_OPUS_MUXER
 691 OGG_CLASS(opus)
 692 AVOutputFormat ff_opus_muxer = {
 693     .name              = "opus",
 694     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Opus"),
 695     .mime_type         = "audio/ogg",
 696     .extensions        = "opus",
 697     .priv_data_size    = sizeof(OGGContext),
 698     .audio_codec       = AV_CODEC_ID_OPUS,
 699     .write_header      = ogg_write_header,
 700     .write_packet      = ogg_write_packet,
 701     .write_trailer     = ogg_write_trailer,
 702     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 703     .priv_class        = &opus_muxer_class,
 704 };
 705 #endif