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 "config_components.h"
  23
  24 #include <stdint.h>
  25
  26 #include "libavutil/crc.h"
  27 #include "libavutil/mathematics.h"
  28 #include "libavutil/mem.h"
  29 #include "libavutil/opt.h"
  30 #include "libavutil/random_seed.h"
  31 #include "libavcodec/xiph.h"
  32 #include "libavcodec/bytestream.h"
  33 #include "libavcodec/flac.h"
  34 #include "avformat.h"
  35 #include "avio_internal.h"
  36 #include "internal.h"
  37 #include "mux.h"
  38 #include "version.h"
  39 #include "vorbiscomment.h"
  40
  41 #define MAX_PAGE_SIZE 65025
  42
  43 typedef struct OGGPage {
  44     int64_t start_granule;
  45     int64_t granule;
  46     int stream_index;
  47     uint8_t flags;
  48     uint8_t segments_count;
  49     uint8_t segments[255];
  50     uint8_t data[MAX_PAGE_SIZE];
  51     uint16_t size;
  52 } OGGPage;
  53
  54 typedef struct OGGStreamContext {
  55     unsigned page_counter;
  56     uint8_t *header[3];
  57     int header_len[3];
  58     /** for theora granule */
  59     int kfgshift;
  60     int64_t last_kf_pts;
  61     int vrev;
  62     /* for VP8 granule */
  63     int isvp8;
  64     int eos;
  65     unsigned page_count; ///< number of page buffered
  66     OGGPage page; ///< current page
  67     unsigned serial_num; ///< serial number
  68     int64_t last_granule; ///< last packet granule
  69 } OGGStreamContext;
  70
  71 typedef struct OGGPageList {
  72     OGGPage page;
  73     struct OGGPageList *next;
  74 } OGGPageList;
  75
  76 typedef struct OGGContext {
  77     const AVClass *class;
  78     OGGPageList *page_list;
  79 #if LIBAVFORMAT_VERSION_MAJOR < 63
  80     int pref_size; ///< preferred page size (0 => fill all segments)
  81 #endif
  82     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)
  83     int serial_offset;
  84 } OGGContext;
  85
  86 #define OFFSET(x) offsetof(OGGContext, x)
  87 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
  88
  89 static const AVOption options[] = {
  90     { "serial_offset", "serial number offset",
  91         OFFSET(serial_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, PARAM },
  92 #if LIBAVFORMAT_VERSION_MAJOR < 63
  93     { "oggpagesize", "Set preferred Ogg page size.",
  94       OFFSET(pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, PARAM | AV_OPT_FLAG_DEPRECATED },
  95     { "pagesize", "preferred page size in bytes",
  96         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM | AV_OPT_FLAG_DEPRECATED },
  97 #endif
  98     { "page_duration", "preferred page duration, in microseconds",
  99         OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
 100     { NULL },
 101 };
 102
 103 static const AVClass ogg_muxer_class = {
 104     .class_name = "Ogg (audio/video/Speex/Opus) muxer",
 105     .item_name  = av_default_item_name,
 106     .option     = options,
 107     .version    = LIBAVUTIL_VERSION_INT,
 108 };
 109
 110 static void ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
 111 {
 112     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
 113     uint8_t buf[4 + 1 + 1 + 8 + 4 + 4 + 4 + 1 + 255], *ptr = buf, *crc_pos;
 114     const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE);
 115     uint32_t crc;
 116
 117     bytestream_put_le32(&ptr, MKTAG('O', 'g', 'g', 'S'));
 118     bytestream_put_byte(&ptr, 0);
 119     bytestream_put_byte(&ptr, page->flags | extra_flags);
 120     bytestream_put_le64(&ptr, page->granule);
 121     bytestream_put_le32(&ptr, oggstream->serial_num);
 122     bytestream_put_le32(&ptr, oggstream->page_counter++);
 123     crc_pos = ptr;
 124     bytestream_put_le32(&ptr, 0);
 125     bytestream_put_byte(&ptr, page->segments_count);
 126     bytestream_put_buffer(&ptr, page->segments, page->segments_count);
 127
 128     crc = av_crc(crc_table, 0, buf, ptr - buf);
 129     crc = av_crc(crc_table, crc, page->data, page->size);
 130     bytestream_put_be32(&crc_pos, crc);
 131
 132     avio_write(s->pb, buf, ptr - buf);
 133     avio_write(s->pb, page->data, page->size);
 134     avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
 135     oggstream->page_count--;
 136 }
 137
 138 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
 139 {
 140     return (oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1))) ||
 141            (oggstream->isvp8    && !((granule >> 3) & 0x07ffffff));
 142 }
 143
 144 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 145 {
 146     if (oggstream->kfgshift)
 147         return (granule>>oggstream->kfgshift) +
 148             (granule & ((1<<oggstream->kfgshift)-1));
 149     else if (oggstream->isvp8)
 150         return granule >> 32;
 151     else
 152         return granule;
 153 }
 154
 155 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 156 {
 157     AVStream *st2 = s->streams[next->stream_index];
 158     AVStream *st  = s->streams[page->stream_index];
 159     int64_t next_granule, cur_granule;
 160
 161     if (next->granule == -1 || page->granule == -1)
 162         return 0;
 163
 164     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 165                                 st2->time_base, AV_TIME_BASE_Q);
 166     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 167                                 st ->time_base, AV_TIME_BASE_Q);
 168     return next_granule > cur_granule;
 169 }
 170
 171 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 172 {
 173     oggstream->page.granule = -1;
 174     oggstream->page.flags = 0;
 175     oggstream->page.segments_count = 0;
 176     oggstream->page.size = 0;
 177     return 0;
 178 }
 179
 180 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 181 {
 182     OGGContext *ogg = s->priv_data;
 183     OGGPageList **p = &ogg->page_list;
 184     OGGPageList *l = av_mallocz(sizeof(*l));
 185
 186     if (!l)
 187         return AVERROR(ENOMEM);
 188     l->page = oggstream->page;
 189
 190     oggstream->page.start_granule = ogg_granule_to_timestamp(oggstream, oggstream->page.granule);
 191     oggstream->page_count++;
 192     ogg_reset_cur_page(oggstream);
 193
 194     while (*p) {
 195         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 196             break;
 197         p = &(*p)->next;
 198     }
 199     l->next = *p;
 200     *p = l;
 201
 202     return 0;
 203 }
 204
 205 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 206                            const uint8_t *data, unsigned size, int64_t granule,
 207                            int header)
 208 {
 209     OGGStreamContext *oggstream = st->priv_data;
 210     OGGContext *ogg = s->priv_data;
 211     int total_segments = size / 255 + 1;
 212     const uint8_t *p = data;
 213     int i, segments, len, flush = 0;
 214
 215     // Handles VFR by flushing page because this frame needs to have a timestamp
 216     // For theora and VP8, keyframes also need to have a timestamp to correctly mark
 217     // them as such, otherwise seeking will not work correctly at the very
 218     // least with old libogg versions.
 219     // Do not try to flush header packets though, that will create broken files.
 220     if ((st->codecpar->codec_id == AV_CODEC_ID_THEORA || st->codecpar->codec_id == AV_CODEC_ID_VP8) && !header &&
 221         (ogg_granule_to_timestamp(oggstream, granule) >
 222          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
 223          ogg_key_granule(oggstream, granule))) {
 224         if (oggstream->page.granule != -1)
 225             ogg_buffer_page(s, oggstream);
 226         flush = 1;
 227     }
 228
 229     // avoid a continued page
 230     if (!header && oggstream->page.size > 0 &&
 231         MAX_PAGE_SIZE - oggstream->page.size < size) {
 232         ogg_buffer_page(s, oggstream);
 233     }
 234
 235     for (i = 0; i < total_segments; ) {
 236         OGGPage *page = &oggstream->page;
 237
 238         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 239
 240         if (i && !page->segments_count)
 241             page->flags |= 1; // continued packet
 242
 243         memset(page->segments+page->segments_count, 255, segments - 1);
 244         page->segments_count += segments - 1;
 245
 246         len = FFMIN(size, segments*255);
 247         page->segments[page->segments_count++] = len - (segments-1)*255;
 248         if (len)
 249             memcpy(page->data+page->size, p, len);
 250         p += len;
 251         size -= len;
 252         i += segments;
 253         page->size += len;
 254
 255         if (i == total_segments)
 256             page->granule = granule;
 257
 258         {
 259             AVStream *st = s->streams[page->stream_index];
 260
 261             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 262                                          AV_TIME_BASE_Q);
 263             int64_t next  = av_rescale_q(ogg_granule_to_timestamp(oggstream, page->granule),
 264                                          st->time_base, AV_TIME_BASE_Q);
 265
 266             if (page->segments_count == 255) {
 267                 ogg_buffer_page(s, oggstream);
 268             } else if (!header) {
 269 #if LIBAVFORMAT_VERSION_MAJOR < 63
 270                 if ((ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
 271                     (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
 272 #else
 273                 if (ogg->pref_duration > 0 && next - start >= ogg->pref_duration) {
 274 #endif
 275                     ogg_buffer_page(s, oggstream);
 276                 }
 277             }
 278         }
 279     }
 280
 281     if (flush && oggstream->page.granule != -1)
 282         ogg_buffer_page(s, oggstream);
 283
 284     return 0;
 285 }
 286
 287 static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
 288                                         int *header_len, AVDictionary **m, int framing_bit,
 289                                         AVChapter **chapters, unsigned int nb_chapters)
 290 {
 291     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
 292     FFIOContext pb;
 293     int64_t size;
 294     uint8_t *p;
 295
 296     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 297
 298     size = offset + ff_vorbiscomment_length(*m, vendor, chapters, nb_chapters) + framing_bit;
 299     if (size > INT_MAX)
 300         return NULL;
 301     p = av_mallocz(size);
 302     if (!p)
 303         return NULL;
 304
 305     ffio_init_write_context(&pb, p + offset, size - offset);
 306     ff_vorbiscomment_write(&pb.pub, *m, vendor, chapters, nb_chapters);
 307     if (framing_bit)
 308         avio_w8(&pb.pub, 1);
 309
 310     *header_len = size;
 311     return p;
 312 }
 313
 314 static int ogg_build_flac_headers(AVCodecParameters *par,
 315                                   OGGStreamContext *oggstream, int bitexact,
 316                                   AVDictionary **m)
 317 {
 318     uint8_t *p;
 319
 320     if (par->extradata_size < FLAC_STREAMINFO_SIZE)
 321         return AVERROR(EINVAL);
 322
 323     // first packet: STREAMINFO
 324     oggstream->header_len[0] = 51;
 325     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
 326     p = oggstream->header[0];
 327     if (!p)
 328         return AVERROR(ENOMEM);
 329     bytestream_put_byte(&p, 0x7F);
 330     bytestream_put_buffer(&p, "FLAC", 4);
 331     bytestream_put_byte(&p, 1); // major version
 332     bytestream_put_byte(&p, 0); // minor version
 333     bytestream_put_be16(&p, 1); // headers packets without this one
 334     bytestream_put_buffer(&p, "fLaC", 4);
 335     bytestream_put_byte(&p, 0x00); // streaminfo
 336     bytestream_put_be24(&p, 34);
 337     bytestream_put_buffer(&p, par->extradata, FLAC_STREAMINFO_SIZE);
 338
 339     // second packet: VorbisComment
 340     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0, NULL, 0);
 341     if (!p)
 342         return AVERROR(ENOMEM);
 343     oggstream->header[1] = p;
 344     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
 345     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
 346
 347     return 0;
 348 }
 349
 350 #define SPEEX_HEADER_SIZE 80
 351
 352 static int ogg_build_speex_headers(AVCodecParameters *par,
 353                                    OGGStreamContext *oggstream, int bitexact,
 354                                    AVDictionary **m)
 355 {
 356     uint8_t *p;
 357
 358     if (par->extradata_size < SPEEX_HEADER_SIZE)
 359         return AVERROR_INVALIDDATA;
 360
 361     // first packet: Speex header
 362     p = av_mallocz(SPEEX_HEADER_SIZE);
 363     if (!p)
 364         return AVERROR(ENOMEM);
 365     oggstream->header[0] = p;
 366     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
 367     bytestream_put_buffer(&p, par->extradata, SPEEX_HEADER_SIZE);
 368     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
 369
 370     // second packet: VorbisComment
 371     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0, NULL, 0);
 372     if (!p)
 373         return AVERROR(ENOMEM);
 374     oggstream->header[1] = p;
 375
 376     return 0;
 377 }
 378
 379 #define OPUS_HEADER_SIZE 19
 380
 381 static int ogg_build_opus_headers(AVCodecParameters *par,
 382                                   OGGStreamContext *oggstream, int bitexact,
 383                                   AVDictionary **m, AVChapter **chapters,
 384                                   unsigned int nb_chapters)
 385 {
 386     uint8_t *p;
 387
 388     if (par->extradata_size < OPUS_HEADER_SIZE)
 389         return AVERROR_INVALIDDATA;
 390
 391     /* first packet: Opus header */
 392     p = av_mallocz(par->extradata_size);
 393     if (!p)
 394         return AVERROR(ENOMEM);
 395     oggstream->header[0] = p;
 396     oggstream->header_len[0] = par->extradata_size;
 397     bytestream_put_buffer(&p, par->extradata, par->extradata_size);
 398
 399     /* second packet: VorbisComment */
 400     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0, chapters, nb_chapters);
 401     if (!p)
 402         return AVERROR(ENOMEM);
 403     oggstream->header[1] = p;
 404     bytestream_put_buffer(&p, "OpusTags", 8);
 405
 406     return 0;
 407 }
 408
 409 #define VP8_HEADER_SIZE 26
 410
 411 static int ogg_build_vp8_headers(AVFormatContext *s, AVStream *st,
 412                                  OGGStreamContext *oggstream, int bitexact)
 413 {
 414     AVCodecParameters *par = st->codecpar;
 415     uint8_t *p;
 416
 417     /* first packet: VP8 header */
 418     p = av_mallocz(VP8_HEADER_SIZE);
 419     if (!p)
 420         return AVERROR(ENOMEM);
 421     oggstream->header[0] = p;
 422     oggstream->header_len[0] = VP8_HEADER_SIZE;
 423     bytestream_put_byte(&p, 0x4f); // HDRID
 424     bytestream_put_buffer(&p, "VP80", 4); // Identifier
 425     bytestream_put_byte(&p, 1); // HDRTYP
 426     bytestream_put_byte(&p, 1); // VMAJ
 427     bytestream_put_byte(&p, 0); // VMIN
 428     bytestream_put_be16(&p, par->width);
 429     bytestream_put_be16(&p, par->height);
 430     bytestream_put_be24(&p, par->sample_aspect_ratio.num);
 431     bytestream_put_be24(&p, par->sample_aspect_ratio.den);
 432     if (st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0) {
 433         // OggVP8 requires pts to increase by 1 per visible frame, so use the least common
 434         // multiple framerate if available.
 435         av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 436                st->time_base.num, st->time_base.den,
 437                st->r_frame_rate.den, st->r_frame_rate.num);
 438         avpriv_set_pts_info(st, 64, st->r_frame_rate.den, st->r_frame_rate.num);
 439     }
 440     bytestream_put_be32(&p, st->time_base.den);
 441     bytestream_put_be32(&p, st->time_base.num);
 442
 443     /* optional second packet: VorbisComment */
 444     if (av_dict_count(st->metadata)) {
 445         p = ogg_write_vorbiscomment(7, bitexact, &oggstream->header_len[1], &st->metadata, 0, NULL, 0);
 446         if (!p)
 447             return AVERROR(ENOMEM);
 448         oggstream->header[1] = p;
 449         bytestream_put_byte(&p, 0x4f); // HDRID
 450         bytestream_put_buffer(&p, "VP80", 4); // Identifier
 451         bytestream_put_byte(&p, 2); // HDRTYP
 452         bytestream_put_byte(&p, 0x20);
 453     }
 454
 455     oggstream->isvp8 = 1;
 456
 457     return 0;
 458 }
 459
 460 static void ogg_write_pages(AVFormatContext *s, int flush)
 461 {
 462     OGGContext *ogg = s->priv_data;
 463     OGGPageList *next, *p;
 464
 465     if (!ogg->page_list)
 466         return;
 467
 468     for (p = ogg->page_list; p; ) {
 469         OGGStreamContext *oggstream =
 470             s->streams[p->page.stream_index]->priv_data;
 471         if (oggstream->page_count < 2 && !flush)
 472             break;
 473         ogg_write_page(s, &p->page,
 474                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
 475         next = p->next;
 476         av_freep(&p);
 477         p = next;
 478     }
 479     ogg->page_list = p;
 480 }
 481
 482 static int ogg_init(AVFormatContext *s)
 483 {
 484     OGGContext *ogg = s->priv_data;
 485     OGGStreamContext *oggstream = NULL;
 486     int i, j;
 487
 488     for (i = 0; i < s->nb_streams; i++) {
 489         AVStream *st = s->streams[i];
 490         unsigned serial_num = i + ogg->serial_offset;
 491
 492         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 493             if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 494                 /* Opus requires a fixed 48kHz clock */
 495                 avpriv_set_pts_info(st, 64, 1, 48000);
 496             else
 497                 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 498         }
 499
 500         if (st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
 501             st->codecpar->codec_id != AV_CODEC_ID_THEORA &&
 502             st->codecpar->codec_id != AV_CODEC_ID_SPEEX  &&
 503             st->codecpar->codec_id != AV_CODEC_ID_FLAC   &&
 504             st->codecpar->codec_id != AV_CODEC_ID_OPUS   &&
 505             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 506             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 507             return AVERROR(EINVAL);
 508         }
 509
 510         if ((!st->codecpar->extradata || !st->codecpar->extradata_size) &&
 511             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 512             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 513             return AVERROR_INVALIDDATA;
 514         }
 515         oggstream = av_mallocz(sizeof(*oggstream));
 516         if (!oggstream)
 517             return AVERROR(ENOMEM);
 518
 519         oggstream->page.stream_index = i;
 520
 521         if (!(s->flags & AVFMT_FLAG_BITEXACT))
 522             do {
 523                 serial_num = av_get_random_seed();
 524                 for (j = 0; j < i; j++) {
 525                     OGGStreamContext *sc = s->streams[j]->priv_data;
 526                     if (serial_num == sc->serial_num)
 527                         break;
 528                 }
 529             } while (j < i);
 530         oggstream->serial_num = serial_num;
 531
 532         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
 533
 534         st->priv_data = oggstream;
 535         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
 536             int err = ogg_build_flac_headers(st->codecpar, oggstream,
 537                                              s->flags & AVFMT_FLAG_BITEXACT,
 538                                              &st->metadata);
 539             if (err) {
 540                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
 541                 return err;
 542             }
 543         } else if (st->codecpar->codec_id == AV_CODEC_ID_SPEEX) {
 544             int err = ogg_build_speex_headers(st->codecpar, oggstream,
 545                                               s->flags & AVFMT_FLAG_BITEXACT,
 546                                               &st->metadata);
 547             if (err) {
 548                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 549                 return err;
 550             }
 551         } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
 552             int err = ogg_build_opus_headers(st->codecpar, oggstream,
 553                                              s->flags & AVFMT_FLAG_BITEXACT,
 554                                              &st->metadata, s->chapters, s->nb_chapters);
 555             if (err) {
 556                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 557                 return err;
 558             }
 559         } else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 560             int err = ogg_build_vp8_headers(s, st, oggstream,
 561                                             s->flags & AVFMT_FLAG_BITEXACT);
 562             if (err) {
 563                 av_log(s, AV_LOG_ERROR, "Error writing VP8 headers\n");
 564                 return err;
 565             }
 566         } else {
 567             uint8_t *p;
 568             const char *cstr = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 569             int header_type = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 570             int framing_bit = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 571
 572             if (avpriv_split_xiph_headers(st->codecpar->extradata, st->codecpar->extradata_size,
 573                                       st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 574                                       (const uint8_t**)oggstream->header, oggstream->header_len) < 0) {
 575                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 576                 oggstream->header[1] = NULL;
 577                 return AVERROR_INVALIDDATA;
 578             }
 579
 580             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
 581                                         &oggstream->header_len[1], &st->metadata,
 582                                         framing_bit, NULL, 0);
 583             oggstream->header[1] = p;
 584             if (!p)
 585                 return AVERROR(ENOMEM);
 586
 587             bytestream_put_byte(&p, header_type);
 588             bytestream_put_buffer(&p, cstr, 6);
 589
 590             if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 591                 int den = AV_RB32(oggstream->header[0] + 22), num = AV_RB32(oggstream->header[0] + 26);
 592                 /* Make sure to use time base stored in the Theora stream header to write
 593                    correct timestamps */
 594                 if (st->time_base.num != num || st->time_base.den != den) {
 595                     av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 596                            st->time_base.num, st->time_base.den, num, den);
 597                     avpriv_set_pts_info(st, 64, num, den);
 598                 }
 599                 /** KFGSHIFT is the width of the less significant section of the granule position
 600                     The less significant section is the frame count since the last keyframe */
 601                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 602                 oggstream->vrev = oggstream->header[0][9];
 603                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 604                        oggstream->kfgshift, oggstream->vrev);
 605             }
 606         }
 607     }
 608
 609     return 0;
 610 }
 611
 612 static int ogg_write_header(AVFormatContext *s)
 613 {
 614     OGGStreamContext *oggstream = NULL;
 615     int i, j;
 616
 617     for (j = 0; j < s->nb_streams; j++) {
 618         oggstream = s->streams[j]->priv_data;
 619         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 620                         oggstream->header_len[0], 0, 1);
 621         oggstream->page.flags |= 2; // bos
 622         ogg_buffer_page(s, oggstream);
 623     }
 624     for (j = 0; j < s->nb_streams; j++) {
 625         AVStream *st = s->streams[j];
 626         oggstream = st->priv_data;
 627         for (i = 1; i < 3; i++) {
 628             if (oggstream->header_len[i])
 629                 ogg_buffer_data(s, st, oggstream->header[i],
 630                                 oggstream->header_len[i], 0, 1);
 631         }
 632         ogg_buffer_page(s, oggstream);
 633     }
 634
 635     oggstream->page.start_granule = AV_NOPTS_VALUE;
 636
 637     ogg_write_pages(s, 2);
 638
 639     return 0;
 640 }
 641
 642 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 643 {
 644     AVStream *st = s->streams[pkt->stream_index];
 645     OGGStreamContext *oggstream = st->priv_data;
 646     int ret;
 647     int64_t granule;
 648
 649     if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 650         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 651         int pframe_count;
 652         if (pkt->flags & AV_PKT_FLAG_KEY)
 653             oggstream->last_kf_pts = pts;
 654         pframe_count = pts - oggstream->last_kf_pts;
 655         // prevent frame count from overflow if key frame flag is not set
 656         if (pframe_count >= (1<<oggstream->kfgshift)) {
 657             oggstream->last_kf_pts += pframe_count;
 658             pframe_count = 0;
 659         }
 660         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 661     } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 662         granule = pkt->pts + pkt->duration +
 663                   av_rescale_q(st->codecpar->initial_padding,
 664                                (AVRational){ 1, st->codecpar->sample_rate },
 665                                st->time_base);
 666     else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 667         int64_t pts, invcnt, dist;
 668         int visible;
 669
 670         visible = (pkt->data[0] >> 4) & 1;
 671         pts     = pkt->pts + pkt->duration;
 672         invcnt  = (oggstream->last_granule >> 30) & 3;
 673         invcnt  = visible ? 3 : (invcnt == 3 ? 0 : invcnt + 1);
 674         dist    = (pkt->flags & AV_PKT_FLAG_KEY) ? 0 : ((oggstream->last_granule >> 3) & 0x07ffffff) + 1;
 675
 676         granule = (pts << 32) | (invcnt << 30) | (dist << 3);
 677     } else
 678         granule = pkt->pts + pkt->duration;
 679
 680     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 681         oggstream->page.start_granule = pkt->pts;
 682
 683     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 684     if (ret < 0)
 685         return ret;
 686
 687     ogg_write_pages(s, 0);
 688
 689     oggstream->last_granule = granule;
 690
 691     return 0;
 692 }
 693
 694 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 695 {
 696     int i;
 697
 698     if (pkt)
 699         return pkt->size || !pkt->side_data_elems ? ogg_write_packet_internal(s, pkt) : 0;
 700
 701     for (i = 0; i < s->nb_streams; i++) {
 702         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 703         if (oggstream->page.segments_count)
 704             ogg_buffer_page(s, oggstream);
 705     }
 706
 707     ogg_write_pages(s, 2);
 708     return 1;
 709 }
 710
 711 static int ogg_write_trailer(AVFormatContext *s)
 712 {
 713     int i;
 714
 715     /* flush current page if needed */
 716     for (i = 0; i < s->nb_streams; i++) {
 717         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 718
 719         if (oggstream->page.segments_count)
 720             ogg_buffer_page(s, oggstream);
 721     }
 722
 723     ogg_write_pages(s, 1);
 724
 725     return 0;
 726 }
 727
 728 static void ogg_free(AVFormatContext *s)
 729 {
 730     OGGContext *ogg = s->priv_data;
 731     OGGPageList *p = ogg->page_list;
 732     int i;
 733
 734     for (i = 0; i < s->nb_streams; i++) {
 735         AVStream *st = s->streams[i];
 736         OGGStreamContext *oggstream = st->priv_data;
 737         if (!oggstream)
 738             continue;
 739         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
 740             st->codecpar->codec_id == AV_CODEC_ID_SPEEX ||
 741             st->codecpar->codec_id == AV_CODEC_ID_OPUS ||
 742             st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 743             av_freep(&oggstream->header[0]);
 744         }
 745         av_freep(&oggstream->header[1]);
 746     }
 747
 748     while (p) {
 749         OGGPageList *next = p->next;
 750         av_free(p);
 751         p = next;
 752     }
 753     ogg->page_list = NULL;
 754 }
 755
 756 #if CONFIG_OGG_MUXER
 757 const FFOutputFormat ff_ogg_muxer = {
 758     .p.name            = "ogg",
 759     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg"),
 760     .p.mime_type       = "application/ogg",
 761     .p.extensions      = "ogg"
 762 #if !CONFIG_OGV_MUXER
 763                          ",ogv"
 764 #endif
 765 #if !CONFIG_SPX_MUXER
 766                          ",spx"
 767 #endif
 768 #if !CONFIG_OPUS_MUXER
 769                          ",opus"
 770 #endif
 771                          ,
 772     .priv_data_size    = sizeof(OGGContext),
 773     .p.audio_codec     = CONFIG_LIBVORBIS_ENCODER ?
 774                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 775     .p.video_codec     = AV_CODEC_ID_THEORA,
 776     .init              = ogg_init,
 777     .write_header      = ogg_write_header,
 778     .write_packet      = ogg_write_packet,
 779     .write_trailer     = ogg_write_trailer,
 780     .deinit            = ogg_free,
 781     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT,
 782     .p.priv_class      = &ogg_muxer_class,
 783     .flags_internal    = FF_OFMT_FLAG_ALLOW_FLUSH,
 784 };
 785 #endif
 786
 787 #if CONFIG_OGA_MUXER
 788 const FFOutputFormat ff_oga_muxer = {
 789     .p.name            = "oga",
 790     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Audio"),
 791     .p.mime_type       = "audio/ogg",
 792     .p.extensions      = "oga",
 793     .priv_data_size    = sizeof(OGGContext),
 794     .p.audio_codec     = AV_CODEC_ID_FLAC,
 795     .init              = ogg_init,
 796     .write_header      = ogg_write_header,
 797     .write_packet      = ogg_write_packet,
 798     .write_trailer     = ogg_write_trailer,
 799     .deinit            = ogg_free,
 800     .p.flags           = AVFMT_TS_NEGATIVE,
 801     .p.priv_class      = &ogg_muxer_class,
 802     .flags_internal    = FF_OFMT_FLAG_ALLOW_FLUSH,
 803 };
 804 #endif
 805
 806 #if CONFIG_OGV_MUXER
 807 const FFOutputFormat ff_ogv_muxer = {
 808     .p.name            = "ogv",
 809     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Video"),
 810     .p.mime_type       = "video/ogg",
 811     .p.extensions      = "ogv",
 812     .priv_data_size    = sizeof(OGGContext),
 813     .p.audio_codec     = CONFIG_LIBVORBIS_ENCODER ?
 814                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 815     .p.video_codec     = CONFIG_LIBTHEORA_ENCODER ?
 816                          AV_CODEC_ID_THEORA : AV_CODEC_ID_VP8,
 817     .init              = ogg_init,
 818     .write_header      = ogg_write_header,
 819     .write_packet      = ogg_write_packet,
 820     .write_trailer     = ogg_write_trailer,
 821     .deinit            = ogg_free,
 822     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT,
 823     .p.priv_class      = &ogg_muxer_class,
 824     .flags_internal    = FF_OFMT_FLAG_ALLOW_FLUSH,
 825 };
 826 #endif
 827
 828 #if CONFIG_SPX_MUXER
 829 const FFOutputFormat ff_spx_muxer = {
 830     .p.name            = "spx",
 831     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Speex"),
 832     .p.mime_type       = "audio/ogg",
 833     .p.extensions      = "spx",
 834     .priv_data_size    = sizeof(OGGContext),
 835     .p.audio_codec     = AV_CODEC_ID_SPEEX,
 836     .init              = ogg_init,
 837     .write_header      = ogg_write_header,
 838     .write_packet      = ogg_write_packet,
 839     .write_trailer     = ogg_write_trailer,
 840     .deinit            = ogg_free,
 841     .p.flags           = AVFMT_TS_NEGATIVE,
 842     .p.priv_class      = &ogg_muxer_class,
 843     .flags_internal    = FF_OFMT_FLAG_ALLOW_FLUSH,
 844 };
 845 #endif
 846
 847 #if CONFIG_OPUS_MUXER
 848 const FFOutputFormat ff_opus_muxer = {
 849     .p.name            = "opus",
 850     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Opus"),
 851     .p.mime_type       = "audio/ogg",
 852     .p.extensions      = "opus",
 853     .priv_data_size    = sizeof(OGGContext),
 854     .p.audio_codec     = AV_CODEC_ID_OPUS,
 855     .init              = ogg_init,
 856     .write_header      = ogg_write_header,
 857     .write_packet      = ogg_write_packet,
 858     .write_trailer     = ogg_write_trailer,
 859     .deinit            = ogg_free,
 860     .p.flags           = AVFMT_TS_NEGATIVE,
 861     .p.priv_class      = &ogg_muxer_class,
 862     .flags_internal    = FF_OFMT_FLAG_ALLOW_FLUSH,
 863 };
 864 #endif