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 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 <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     /* for VP8 granule */
  58     int isvp8;
  59     int eos;
  60     unsigned page_count; ///< number of page buffered
  61     OGGPage page; ///< current page
  62     unsigned serial_num; ///< serial number
  63     int64_t last_granule; ///< last packet granule
  64 } OGGStreamContext;
  65
  66 typedef struct OGGPageList {
  67     OGGPage page;
  68     struct OGGPageList *next;
  69 } OGGPageList;
  70
  71 typedef struct OGGContext {
  72     const AVClass *class;
  73     OGGPageList *page_list;
  74     int pref_size; ///< preferred page size (0 => fill all segments)
  75     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)
  76     int serial_offset;
  77 } OGGContext;
  78
  79 #define OFFSET(x) offsetof(OGGContext, x)
  80 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
  81
  82 static const AVOption options[] = {
  83     { "serial_offset", "serial number offset",
  84         OFFSET(serial_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, PARAM },
  85     { "oggpagesize", "Set preferred Ogg page size.",
  86       OFFSET(pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, PARAM},
  87     { "pagesize", "preferred page size in bytes (deprecated)",
  88         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
  89     { "page_duration", "preferred page duration, in microseconds",
  90         OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
  91     { NULL },
  92 };
  93
  94 #define OGG_CLASS(flavor, name)\
  95 static const AVClass flavor ## _muxer_class = {\
  96     .class_name = #name " muxer",\
  97     .item_name  = av_default_item_name,\
  98     .option     = options,\
  99     .version    = LIBAVUTIL_VERSION_INT,\
 100 };
 101
 102 static void ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
 103 {
 104     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
 105     uint8_t buf[4 + 1 + 1 + 8 + 4 + 4 + 4 + 1 + 255], *ptr = buf, *crc_pos;
 106     const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE);
 107     uint32_t crc;
 108
 109     bytestream_put_le32(&ptr, MKTAG('O', 'g', 'g', 'S'));
 110     bytestream_put_byte(&ptr, 0);
 111     bytestream_put_byte(&ptr, page->flags | extra_flags);
 112     bytestream_put_le64(&ptr, page->granule);
 113     bytestream_put_le32(&ptr, oggstream->serial_num);
 114     bytestream_put_le32(&ptr, oggstream->page_counter++);
 115     crc_pos = ptr;
 116     bytestream_put_le32(&ptr, 0);
 117     bytestream_put_byte(&ptr, page->segments_count);
 118     bytestream_put_buffer(&ptr, page->segments, page->segments_count);
 119
 120     crc = av_crc(crc_table, 0, buf, ptr - buf);
 121     crc = av_crc(crc_table, crc, page->data, page->size);
 122     bytestream_put_be32(&crc_pos, crc);
 123
 124     avio_write(s->pb, buf, ptr - buf);
 125     avio_write(s->pb, page->data, page->size);
 126     avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
 127     oggstream->page_count--;
 128 }
 129
 130 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
 131 {
 132     return (oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1))) ||
 133            (oggstream->isvp8    && !((granule >> 3) & 0x07ffffff));
 134 }
 135
 136 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 137 {
 138     if (oggstream->kfgshift)
 139         return (granule>>oggstream->kfgshift) +
 140             (granule & ((1<<oggstream->kfgshift)-1));
 141     else if (oggstream->isvp8)
 142         return granule >> 32;
 143     else
 144         return granule;
 145 }
 146
 147 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 148 {
 149     AVStream *st2 = s->streams[next->stream_index];
 150     AVStream *st  = s->streams[page->stream_index];
 151     int64_t next_granule, cur_granule;
 152
 153     if (next->granule == -1 || page->granule == -1)
 154         return 0;
 155
 156     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 157                                 st2->time_base, AV_TIME_BASE_Q);
 158     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 159                                 st ->time_base, AV_TIME_BASE_Q);
 160     return next_granule > cur_granule;
 161 }
 162
 163 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 164 {
 165     oggstream->page.granule = -1;
 166     oggstream->page.flags = 0;
 167     oggstream->page.segments_count = 0;
 168     oggstream->page.size = 0;
 169     return 0;
 170 }
 171
 172 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 173 {
 174     OGGContext *ogg = s->priv_data;
 175     OGGPageList **p = &ogg->page_list;
 176     OGGPageList *l = av_mallocz(sizeof(*l));
 177
 178     if (!l)
 179         return AVERROR(ENOMEM);
 180     l->page = oggstream->page;
 181
 182     oggstream->page.start_granule = ogg_granule_to_timestamp(oggstream, oggstream->page.granule);
 183     oggstream->page_count++;
 184     ogg_reset_cur_page(oggstream);
 185
 186     while (*p) {
 187         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 188             break;
 189         p = &(*p)->next;
 190     }
 191     l->next = *p;
 192     *p = l;
 193
 194     return 0;
 195 }
 196
 197 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 198                            uint8_t *data, unsigned size, int64_t granule,
 199                            int header)
 200 {
 201     OGGStreamContext *oggstream = st->priv_data;
 202     OGGContext *ogg = s->priv_data;
 203     int total_segments = size / 255 + 1;
 204     uint8_t *p = data;
 205     int i, segments, len, flush = 0;
 206
 207     // Handles VFR by flushing page because this frame needs to have a timestamp
 208     // For theora and VP8, keyframes also need to have a timestamp to correctly mark
 209     // them as such, otherwise seeking will not work correctly at the very
 210     // least with old libogg versions.
 211     // Do not try to flush header packets though, that will create broken files.
 212     if ((st->codecpar->codec_id == AV_CODEC_ID_THEORA || st->codecpar->codec_id == AV_CODEC_ID_VP8) && !header &&
 213         (ogg_granule_to_timestamp(oggstream, granule) >
 214          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
 215          ogg_key_granule(oggstream, granule))) {
 216         if (oggstream->page.granule != -1)
 217             ogg_buffer_page(s, oggstream);
 218         flush = 1;
 219     }
 220
 221     // avoid a continued page
 222     if (!header && oggstream->page.size > 0 &&
 223         MAX_PAGE_SIZE - oggstream->page.size < size) {
 224         ogg_buffer_page(s, oggstream);
 225     }
 226
 227     for (i = 0; i < total_segments; ) {
 228         OGGPage *page = &oggstream->page;
 229
 230         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 231
 232         if (i && !page->segments_count)
 233             page->flags |= 1; // continued packet
 234
 235         memset(page->segments+page->segments_count, 255, segments - 1);
 236         page->segments_count += segments - 1;
 237
 238         len = FFMIN(size, segments*255);
 239         page->segments[page->segments_count++] = len - (segments-1)*255;
 240         memcpy(page->data+page->size, p, len);
 241         p += len;
 242         size -= len;
 243         i += segments;
 244         page->size += len;
 245
 246         if (i == total_segments)
 247             page->granule = granule;
 248
 249         {
 250             AVStream *st = s->streams[page->stream_index];
 251
 252             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 253                                          AV_TIME_BASE_Q);
 254             int64_t next  = av_rescale_q(ogg_granule_to_timestamp(oggstream, page->granule),
 255                                          st->time_base, AV_TIME_BASE_Q);
 256
 257             if (page->segments_count == 255) {
 258                 ogg_buffer_page(s, oggstream);
 259             } else if (!header) {
 260                 if ((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
 268     if (flush && oggstream->page.granule != -1)
 269         ogg_buffer_page(s, oggstream);
 270
 271     return 0;
 272 }
 273
 274 static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
 275                                         int *header_len, AVDictionary **m, int framing_bit,
 276                                         AVChapter **chapters, unsigned int nb_chapters)
 277 {
 278     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
 279     AVIOContext pb;
 280     int64_t size;
 281     uint8_t *p;
 282
 283     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 284
 285     size = offset + ff_vorbiscomment_length(*m, vendor, chapters, nb_chapters) + framing_bit;
 286     if (size > INT_MAX)
 287         return NULL;
 288     p = av_mallocz(size);
 289     if (!p)
 290         return NULL;
 291
 292     ffio_init_context(&pb, p + offset, size - offset, 1, NULL, NULL, NULL, NULL);
 293     ff_vorbiscomment_write(&pb, *m, vendor, chapters, nb_chapters);
 294     if (framing_bit)
 295         avio_w8(&pb, 1);
 296
 297     *header_len = size;
 298     return p;
 299 }
 300
 301 static int ogg_build_flac_headers(AVCodecParameters *par,
 302                                   OGGStreamContext *oggstream, int bitexact,
 303                                   AVDictionary **m)
 304 {
 305     uint8_t *p;
 306
 307     if (par->extradata_size < FLAC_STREAMINFO_SIZE)
 308         return AVERROR(EINVAL);
 309
 310     // first packet: STREAMINFO
 311     oggstream->header_len[0] = 51;
 312     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
 313     p = oggstream->header[0];
 314     if (!p)
 315         return AVERROR(ENOMEM);
 316     bytestream_put_byte(&p, 0x7F);
 317     bytestream_put_buffer(&p, "FLAC", 4);
 318     bytestream_put_byte(&p, 1); // major version
 319     bytestream_put_byte(&p, 0); // minor version
 320     bytestream_put_be16(&p, 1); // headers packets without this one
 321     bytestream_put_buffer(&p, "fLaC", 4);
 322     bytestream_put_byte(&p, 0x00); // streaminfo
 323     bytestream_put_be24(&p, 34);
 324     bytestream_put_buffer(&p, par->extradata, FLAC_STREAMINFO_SIZE);
 325
 326     // second packet: VorbisComment
 327     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0, NULL, 0);
 328     if (!p)
 329         return AVERROR(ENOMEM);
 330     oggstream->header[1] = p;
 331     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
 332     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
 333
 334     return 0;
 335 }
 336
 337 #define SPEEX_HEADER_SIZE 80
 338
 339 static int ogg_build_speex_headers(AVCodecParameters *par,
 340                                    OGGStreamContext *oggstream, int bitexact,
 341                                    AVDictionary **m)
 342 {
 343     uint8_t *p;
 344
 345     if (par->extradata_size < SPEEX_HEADER_SIZE)
 346         return AVERROR_INVALIDDATA;
 347
 348     // first packet: Speex header
 349     p = av_mallocz(SPEEX_HEADER_SIZE);
 350     if (!p)
 351         return AVERROR(ENOMEM);
 352     oggstream->header[0] = p;
 353     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
 354     bytestream_put_buffer(&p, par->extradata, SPEEX_HEADER_SIZE);
 355     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
 356
 357     // second packet: VorbisComment
 358     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0, NULL, 0);
 359     if (!p)
 360         return AVERROR(ENOMEM);
 361     oggstream->header[1] = p;
 362
 363     return 0;
 364 }
 365
 366 #define OPUS_HEADER_SIZE 19
 367
 368 static int ogg_build_opus_headers(AVCodecParameters *par,
 369                                   OGGStreamContext *oggstream, int bitexact,
 370                                   AVDictionary **m, AVChapter **chapters,
 371                                   unsigned int nb_chapters)
 372 {
 373     uint8_t *p;
 374
 375     if (par->extradata_size < OPUS_HEADER_SIZE)
 376         return AVERROR_INVALIDDATA;
 377
 378     /* first packet: Opus header */
 379     p = av_mallocz(par->extradata_size);
 380     if (!p)
 381         return AVERROR(ENOMEM);
 382     oggstream->header[0] = p;
 383     oggstream->header_len[0] = par->extradata_size;
 384     bytestream_put_buffer(&p, par->extradata, par->extradata_size);
 385
 386     /* second packet: VorbisComment */
 387     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0, chapters, nb_chapters);
 388     if (!p)
 389         return AVERROR(ENOMEM);
 390     oggstream->header[1] = p;
 391     bytestream_put_buffer(&p, "OpusTags", 8);
 392
 393     return 0;
 394 }
 395
 396 #define VP8_HEADER_SIZE 26
 397
 398 static int ogg_build_vp8_headers(AVFormatContext *s, AVStream *st,
 399                                  OGGStreamContext *oggstream, int bitexact)
 400 {
 401     AVCodecParameters *par = st->codecpar;
 402     uint8_t *p;
 403
 404     /* first packet: VP8 header */
 405     p = av_mallocz(VP8_HEADER_SIZE);
 406     if (!p)
 407         return AVERROR(ENOMEM);
 408     oggstream->header[0] = p;
 409     oggstream->header_len[0] = VP8_HEADER_SIZE;
 410     bytestream_put_byte(&p, 0x4f); // HDRID
 411     bytestream_put_buffer(&p, "VP80", 4); // Identifier
 412     bytestream_put_byte(&p, 1); // HDRTYP
 413     bytestream_put_byte(&p, 1); // VMAJ
 414     bytestream_put_byte(&p, 0); // VMIN
 415     bytestream_put_be16(&p, par->width);
 416     bytestream_put_be16(&p, par->height);
 417     bytestream_put_be24(&p, par->sample_aspect_ratio.num);
 418     bytestream_put_be24(&p, par->sample_aspect_ratio.den);
 419     if (st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0) {
 420         // OggVP8 requires pts to increase by 1 per visible frame, so use the least common
 421         // multiple framerate if available.
 422         av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 423                st->time_base.num, st->time_base.den,
 424                st->r_frame_rate.den, st->r_frame_rate.num);
 425         avpriv_set_pts_info(st, 64, st->r_frame_rate.den, st->r_frame_rate.num);
 426     }
 427     bytestream_put_be32(&p, st->time_base.den);
 428     bytestream_put_be32(&p, st->time_base.num);
 429
 430     /* optional second packet: VorbisComment */
 431     if (av_dict_get(st->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
 432         p = ogg_write_vorbiscomment(7, bitexact, &oggstream->header_len[1], &st->metadata, 0, NULL, 0);
 433         if (!p)
 434             return AVERROR(ENOMEM);
 435         oggstream->header[1] = p;
 436         bytestream_put_byte(&p, 0x4f); // HDRID
 437         bytestream_put_buffer(&p, "VP80", 4); // Identifier
 438         bytestream_put_byte(&p, 2); // HDRTYP
 439         bytestream_put_byte(&p, 0x20);
 440     }
 441
 442     oggstream->isvp8 = 1;
 443
 444     return 0;
 445 }
 446
 447 static void ogg_write_pages(AVFormatContext *s, int flush)
 448 {
 449     OGGContext *ogg = s->priv_data;
 450     OGGPageList *next, *p;
 451
 452     if (!ogg->page_list)
 453         return;
 454
 455     for (p = ogg->page_list; p; ) {
 456         OGGStreamContext *oggstream =
 457             s->streams[p->page.stream_index]->priv_data;
 458         if (oggstream->page_count < 2 && !flush)
 459             break;
 460         ogg_write_page(s, &p->page,
 461                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
 462         next = p->next;
 463         av_freep(&p);
 464         p = next;
 465     }
 466     ogg->page_list = p;
 467 }
 468
 469 static int ogg_init(AVFormatContext *s)
 470 {
 471     OGGContext *ogg = s->priv_data;
 472     OGGStreamContext *oggstream = NULL;
 473     int i, j;
 474
 475     if (ogg->pref_size)
 476         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
 477
 478     for (i = 0; i < s->nb_streams; i++) {
 479         AVStream *st = s->streams[i];
 480         unsigned serial_num = i + ogg->serial_offset;
 481
 482         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 483             if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 484                 /* Opus requires a fixed 48kHz clock */
 485                 avpriv_set_pts_info(st, 64, 1, 48000);
 486             else
 487                 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 488         }
 489
 490         if (st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
 491             st->codecpar->codec_id != AV_CODEC_ID_THEORA &&
 492             st->codecpar->codec_id != AV_CODEC_ID_SPEEX  &&
 493             st->codecpar->codec_id != AV_CODEC_ID_FLAC   &&
 494             st->codecpar->codec_id != AV_CODEC_ID_OPUS   &&
 495             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 496             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 497             return AVERROR(EINVAL);
 498         }
 499
 500         if ((!st->codecpar->extradata || !st->codecpar->extradata_size) &&
 501             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 502             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 503             return AVERROR_INVALIDDATA;
 504         }
 505         oggstream = av_mallocz(sizeof(*oggstream));
 506         if (!oggstream)
 507             return AVERROR(ENOMEM);
 508
 509         oggstream->page.stream_index = i;
 510
 511         if (!(s->flags & AVFMT_FLAG_BITEXACT))
 512             do {
 513                 serial_num = av_get_random_seed();
 514                 for (j = 0; j < i; j++) {
 515                     OGGStreamContext *sc = s->streams[j]->priv_data;
 516                     if (serial_num == sc->serial_num)
 517                         break;
 518                 }
 519             } while (j < i);
 520         oggstream->serial_num = serial_num;
 521
 522         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
 523
 524         st->priv_data = oggstream;
 525         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
 526             int err = ogg_build_flac_headers(st->codecpar, oggstream,
 527                                              s->flags & AVFMT_FLAG_BITEXACT,
 528                                              &st->metadata);
 529             if (err) {
 530                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
 531                 return err;
 532             }
 533         } else if (st->codecpar->codec_id == AV_CODEC_ID_SPEEX) {
 534             int err = ogg_build_speex_headers(st->codecpar, oggstream,
 535                                               s->flags & AVFMT_FLAG_BITEXACT,
 536                                               &st->metadata);
 537             if (err) {
 538                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 539                 return err;
 540             }
 541         } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
 542             int err = ogg_build_opus_headers(st->codecpar, oggstream,
 543                                              s->flags & AVFMT_FLAG_BITEXACT,
 544                                              &st->metadata, s->chapters, s->nb_chapters);
 545             if (err) {
 546                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 547                 return err;
 548             }
 549         } else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 550             int err = ogg_build_vp8_headers(s, st, oggstream,
 551                                             s->flags & AVFMT_FLAG_BITEXACT);
 552             if (err) {
 553                 av_log(s, AV_LOG_ERROR, "Error writing VP8 headers\n");
 554                 return err;
 555             }
 556         } else {
 557             uint8_t *p;
 558             const char *cstr = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 559             int header_type = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 560             int framing_bit = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 561
 562             if (avpriv_split_xiph_headers(st->codecpar->extradata, st->codecpar->extradata_size,
 563                                       st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 564                                       (const uint8_t**)oggstream->header, oggstream->header_len) < 0) {
 565                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 566                 oggstream->header[1] = NULL;
 567                 return AVERROR_INVALIDDATA;
 568             }
 569
 570             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
 571                                         &oggstream->header_len[1], &st->metadata,
 572                                         framing_bit, NULL, 0);
 573             oggstream->header[1] = p;
 574             if (!p)
 575                 return AVERROR(ENOMEM);
 576
 577             bytestream_put_byte(&p, header_type);
 578             bytestream_put_buffer(&p, cstr, 6);
 579
 580             if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 581                 int den = AV_RB32(oggstream->header[0] + 22), num = AV_RB32(oggstream->header[0] + 26);
 582                 /* Make sure to use time base stored in the Theora stream header to write
 583                    correct timestamps */
 584                 if (st->time_base.num != num || st->time_base.den != den) {
 585                     av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 586                            st->time_base.num, st->time_base.den, num, den);
 587                     avpriv_set_pts_info(st, 64, num, den);
 588                 }
 589                 /** KFGSHIFT is the width of the less significant section of the granule position
 590                     The less significant section is the frame count since the last keyframe */
 591                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 592                 oggstream->vrev = oggstream->header[0][9];
 593                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 594                        oggstream->kfgshift, oggstream->vrev);
 595             }
 596         }
 597     }
 598
 599     return 0;
 600 }
 601
 602 static int ogg_write_header(AVFormatContext *s)
 603 {
 604     OGGStreamContext *oggstream = NULL;
 605     int i, j;
 606
 607     for (j = 0; j < s->nb_streams; j++) {
 608         oggstream = s->streams[j]->priv_data;
 609         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 610                         oggstream->header_len[0], 0, 1);
 611         oggstream->page.flags |= 2; // bos
 612         ogg_buffer_page(s, oggstream);
 613     }
 614     for (j = 0; j < s->nb_streams; j++) {
 615         AVStream *st = s->streams[j];
 616         oggstream = st->priv_data;
 617         for (i = 1; i < 3; i++) {
 618             if (oggstream->header_len[i])
 619                 ogg_buffer_data(s, st, oggstream->header[i],
 620                                 oggstream->header_len[i], 0, 1);
 621         }
 622         ogg_buffer_page(s, oggstream);
 623     }
 624
 625     oggstream->page.start_granule = AV_NOPTS_VALUE;
 626
 627     ogg_write_pages(s, 2);
 628
 629     return 0;
 630 }
 631
 632 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 633 {
 634     AVStream *st = s->streams[pkt->stream_index];
 635     OGGStreamContext *oggstream = st->priv_data;
 636     int ret;
 637     int64_t granule;
 638
 639     if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 640         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 641         int pframe_count;
 642         if (pkt->flags & AV_PKT_FLAG_KEY)
 643             oggstream->last_kf_pts = pts;
 644         pframe_count = pts - oggstream->last_kf_pts;
 645         // prevent frame count from overflow if key frame flag is not set
 646         if (pframe_count >= (1<<oggstream->kfgshift)) {
 647             oggstream->last_kf_pts += pframe_count;
 648             pframe_count = 0;
 649         }
 650         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 651     } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 652         granule = pkt->pts + pkt->duration +
 653                   av_rescale_q(st->codecpar->initial_padding,
 654                                (AVRational){ 1, st->codecpar->sample_rate },
 655                                st->time_base);
 656     else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 657         int64_t pts, invcnt, dist;
 658         int visible;
 659
 660         visible = (pkt->data[0] >> 4) & 1;
 661         pts     = pkt->pts + pkt->duration;
 662         invcnt  = (oggstream->last_granule >> 30) & 3;
 663         invcnt  = visible ? 3 : (invcnt == 3 ? 0 : invcnt + 1);
 664         dist    = (pkt->flags & AV_PKT_FLAG_KEY) ? 0 : ((oggstream->last_granule >> 3) & 0x07ffffff) + 1;
 665
 666         granule = (pts << 32) | (invcnt << 30) | (dist << 3);
 667     } else
 668         granule = pkt->pts + pkt->duration;
 669
 670     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 671         oggstream->page.start_granule = pkt->pts;
 672
 673     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 674     if (ret < 0)
 675         return ret;
 676
 677     ogg_write_pages(s, 0);
 678
 679     oggstream->last_granule = granule;
 680
 681     return 0;
 682 }
 683
 684 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 685 {
 686     int i;
 687
 688     if (pkt)
 689         return ogg_write_packet_internal(s, pkt);
 690
 691     for (i = 0; i < s->nb_streams; i++) {
 692         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 693         if (oggstream->page.segments_count)
 694             ogg_buffer_page(s, oggstream);
 695     }
 696
 697     ogg_write_pages(s, 2);
 698     return 1;
 699 }
 700
 701 static int ogg_write_trailer(AVFormatContext *s)
 702 {
 703     int i;
 704
 705     /* flush current page if needed */
 706     for (i = 0; i < s->nb_streams; i++) {
 707         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 708
 709         if (oggstream->page.size > 0)
 710             ogg_buffer_page(s, oggstream);
 711     }
 712
 713     ogg_write_pages(s, 1);
 714
 715     return 0;
 716 }
 717
 718 static void ogg_free(AVFormatContext *s)
 719 {
 720     OGGContext *ogg = s->priv_data;
 721     OGGPageList *p = ogg->page_list;
 722     int i;
 723
 724     for (i = 0; i < s->nb_streams; i++) {
 725         AVStream *st = s->streams[i];
 726         OGGStreamContext *oggstream = st->priv_data;
 727         if (!oggstream)
 728             continue;
 729         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
 730             st->codecpar->codec_id == AV_CODEC_ID_SPEEX ||
 731             st->codecpar->codec_id == AV_CODEC_ID_OPUS ||
 732             st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 733             av_freep(&oggstream->header[0]);
 734         }
 735         av_freep(&oggstream->header[1]);
 736     }
 737
 738     while (p) {
 739         OGGPageList *next = p->next;
 740         av_free(p);
 741         p = next;
 742     }
 743     ogg->page_list = NULL;
 744 }
 745
 746 #if CONFIG_OGG_MUXER
 747 OGG_CLASS(ogg, Ogg)
 748 AVOutputFormat ff_ogg_muxer = {
 749     .name              = "ogg",
 750     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
 751     .mime_type         = "application/ogg",
 752     .extensions        = "ogg"
 753 #if !CONFIG_OGV_MUXER
 754                          ",ogv"
 755 #endif
 756 #if !CONFIG_SPX_MUXER
 757                          ",spx"
 758 #endif
 759 #if !CONFIG_OPUS_MUXER
 760                          ",opus"
 761 #endif
 762                          ,
 763     .priv_data_size    = sizeof(OGGContext),
 764     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 765                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 766     .video_codec       = AV_CODEC_ID_THEORA,
 767     .init              = ogg_init,
 768     .write_header      = ogg_write_header,
 769     .write_packet      = ogg_write_packet,
 770     .write_trailer     = ogg_write_trailer,
 771     .deinit            = ogg_free,
 772     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 773     .priv_class        = &ogg_muxer_class,
 774 };
 775 #endif
 776
 777 #if CONFIG_OGA_MUXER
 778 OGG_CLASS(oga, Ogg audio)
 779 AVOutputFormat ff_oga_muxer = {
 780     .name              = "oga",
 781     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Audio"),
 782     .mime_type         = "audio/ogg",
 783     .extensions        = "oga",
 784     .priv_data_size    = sizeof(OGGContext),
 785     .audio_codec       = AV_CODEC_ID_FLAC,
 786     .init              = ogg_init,
 787     .write_header      = ogg_write_header,
 788     .write_packet      = ogg_write_packet,
 789     .write_trailer     = ogg_write_trailer,
 790     .deinit            = ogg_free,
 791     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 792     .priv_class        = &oga_muxer_class,
 793 };
 794 #endif
 795
 796 #if CONFIG_OGV_MUXER
 797 OGG_CLASS(ogv, Ogg video)
 798 AVOutputFormat ff_ogv_muxer = {
 799     .name              = "ogv",
 800     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Video"),
 801     .mime_type         = "video/ogg",
 802     .extensions        = "ogv",
 803     .priv_data_size    = sizeof(OGGContext),
 804     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 805                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 806     .video_codec       = CONFIG_LIBTHEORA_ENCODER ?
 807                          AV_CODEC_ID_THEORA : AV_CODEC_ID_VP8,
 808     .init              = ogg_init,
 809     .write_header      = ogg_write_header,
 810     .write_packet      = ogg_write_packet,
 811     .write_trailer     = ogg_write_trailer,
 812     .deinit            = ogg_free,
 813     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 814     .priv_class        = &ogv_muxer_class,
 815 };
 816 #endif
 817
 818 #if CONFIG_SPX_MUXER
 819 OGG_CLASS(spx, Ogg Speex)
 820 AVOutputFormat ff_spx_muxer = {
 821     .name              = "spx",
 822     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Speex"),
 823     .mime_type         = "audio/ogg",
 824     .extensions        = "spx",
 825     .priv_data_size    = sizeof(OGGContext),
 826     .audio_codec       = AV_CODEC_ID_SPEEX,
 827     .init              = ogg_init,
 828     .write_header      = ogg_write_header,
 829     .write_packet      = ogg_write_packet,
 830     .write_trailer     = ogg_write_trailer,
 831     .deinit            = ogg_free,
 832     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 833     .priv_class        = &spx_muxer_class,
 834 };
 835 #endif
 836
 837 #if CONFIG_OPUS_MUXER
 838 OGG_CLASS(opus, Ogg Opus)
 839 AVOutputFormat ff_opus_muxer = {
 840     .name              = "opus",
 841     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Opus"),
 842     .mime_type         = "audio/ogg",
 843     .extensions        = "opus",
 844     .priv_data_size    = sizeof(OGGContext),
 845     .audio_codec       = AV_CODEC_ID_OPUS,
 846     .init              = ogg_init,
 847     .write_header      = ogg_write_header,
 848     .write_packet      = ogg_write_packet,
 849     .write_trailer     = ogg_write_trailer,
 850     .deinit            = ogg_free,
 851     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 852     .priv_class        = &opus_muxer_class,
 853 };
 854 #endif