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/opt.h"
  29 #include "libavutil/random_seed.h"
  30 #include "libavcodec/xiph.h"
  31 #include "libavcodec/bytestream.h"
  32 #include "libavcodec/flac.h"
  33 #include "avformat.h"
  34 #include "avio_internal.h"
  35 #include "internal.h"
  36 #include "mux.h"
  37 #include "version.h"
  38 #include "vorbiscomment.h"
  39
  40 #define MAX_PAGE_SIZE 65025
  41
  42 typedef struct OGGPage {
  43     int64_t start_granule;
  44     int64_t granule;
  45     int stream_index;
  46     uint8_t flags;
  47     uint8_t segments_count;
  48     uint8_t segments[255];
  49     uint8_t data[MAX_PAGE_SIZE];
  50     uint16_t size;
  51 } OGGPage;
  52
  53 typedef struct OGGStreamContext {
  54     unsigned page_counter;
  55     uint8_t *header[3];
  56     int header_len[3];
  57     /** for theora granule */
  58     int kfgshift;
  59     int64_t last_kf_pts;
  60     int vrev;
  61     /* for VP8 granule */
  62     int isvp8;
  63     int eos;
  64     unsigned page_count; ///< number of page buffered
  65     OGGPage page; ///< current page
  66     unsigned serial_num; ///< serial number
  67     int64_t last_granule; ///< last packet granule
  68 } OGGStreamContext;
  69
  70 typedef struct OGGPageList {
  71     OGGPage page;
  72     struct OGGPageList *next;
  73 } OGGPageList;
  74
  75 typedef struct OGGContext {
  76     const AVClass *class;
  77     OGGPageList *page_list;
  78     int pref_size; ///< preferred page size (0 => fill all segments)
  79     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)
  80     int serial_offset;
  81 } OGGContext;
  82
  83 #define OFFSET(x) offsetof(OGGContext, x)
  84 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
  85
  86 static const AVOption options[] = {
  87     { "serial_offset", "serial number offset",
  88         OFFSET(serial_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, PARAM },
  89     { "oggpagesize", "Set preferred Ogg page size.",
  90       OFFSET(pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, PARAM},
  91     { "pagesize", "preferred page size in bytes (deprecated)",
  92         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
  93     { "page_duration", "preferred page duration, in microseconds",
  94         OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
  95     { NULL },
  96 };
  97
  98 static const AVClass ogg_muxer_class = {
  99     .class_name = "Ogg (audio/video/Speex/Opus) muxer",
 100     .item_name  = av_default_item_name,
 101     .option     = options,
 102     .version    = LIBAVUTIL_VERSION_INT,
 103 };
 104
 105 static void ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
 106 {
 107     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
 108     uint8_t buf[4 + 1 + 1 + 8 + 4 + 4 + 4 + 1 + 255], *ptr = buf, *crc_pos;
 109     const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE);
 110     uint32_t crc;
 111
 112     bytestream_put_le32(&ptr, MKTAG('O', 'g', 'g', 'S'));
 113     bytestream_put_byte(&ptr, 0);
 114     bytestream_put_byte(&ptr, page->flags | extra_flags);
 115     bytestream_put_le64(&ptr, page->granule);
 116     bytestream_put_le32(&ptr, oggstream->serial_num);
 117     bytestream_put_le32(&ptr, oggstream->page_counter++);
 118     crc_pos = ptr;
 119     bytestream_put_le32(&ptr, 0);
 120     bytestream_put_byte(&ptr, page->segments_count);
 121     bytestream_put_buffer(&ptr, page->segments, page->segments_count);
 122
 123     crc = av_crc(crc_table, 0, buf, ptr - buf);
 124     crc = av_crc(crc_table, crc, page->data, page->size);
 125     bytestream_put_be32(&crc_pos, crc);
 126
 127     avio_write(s->pb, buf, ptr - buf);
 128     avio_write(s->pb, page->data, page->size);
 129     avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
 130     oggstream->page_count--;
 131 }
 132
 133 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
 134 {
 135     return (oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1))) ||
 136            (oggstream->isvp8    && !((granule >> 3) & 0x07ffffff));
 137 }
 138
 139 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 140 {
 141     if (oggstream->kfgshift)
 142         return (granule>>oggstream->kfgshift) +
 143             (granule & ((1<<oggstream->kfgshift)-1));
 144     else if (oggstream->isvp8)
 145         return granule >> 32;
 146     else
 147         return granule;
 148 }
 149
 150 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 151 {
 152     AVStream *st2 = s->streams[next->stream_index];
 153     AVStream *st  = s->streams[page->stream_index];
 154     int64_t next_granule, cur_granule;
 155
 156     if (next->granule == -1 || page->granule == -1)
 157         return 0;
 158
 159     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 160                                 st2->time_base, AV_TIME_BASE_Q);
 161     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 162                                 st ->time_base, AV_TIME_BASE_Q);
 163     return next_granule > cur_granule;
 164 }
 165
 166 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 167 {
 168     oggstream->page.granule = -1;
 169     oggstream->page.flags = 0;
 170     oggstream->page.segments_count = 0;
 171     oggstream->page.size = 0;
 172     return 0;
 173 }
 174
 175 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 176 {
 177     OGGContext *ogg = s->priv_data;
 178     OGGPageList **p = &ogg->page_list;
 179     OGGPageList *l = av_mallocz(sizeof(*l));
 180
 181     if (!l)
 182         return AVERROR(ENOMEM);
 183     l->page = oggstream->page;
 184
 185     oggstream->page.start_granule = ogg_granule_to_timestamp(oggstream, oggstream->page.granule);
 186     oggstream->page_count++;
 187     ogg_reset_cur_page(oggstream);
 188
 189     while (*p) {
 190         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 191             break;
 192         p = &(*p)->next;
 193     }
 194     l->next = *p;
 195     *p = l;
 196
 197     return 0;
 198 }
 199
 200 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 201                            const uint8_t *data, unsigned size, int64_t granule,
 202                            int header)
 203 {
 204     OGGStreamContext *oggstream = st->priv_data;
 205     OGGContext *ogg = s->priv_data;
 206     int total_segments = size / 255 + 1;
 207     const uint8_t *p = data;
 208     int i, segments, len, flush = 0;
 209
 210     // Handles VFR by flushing page because this frame needs to have a timestamp
 211     // For theora and VP8, keyframes also need to have a timestamp to correctly mark
 212     // them as such, otherwise seeking will not work correctly at the very
 213     // least with old libogg versions.
 214     // Do not try to flush header packets though, that will create broken files.
 215     if ((st->codecpar->codec_id == AV_CODEC_ID_THEORA || st->codecpar->codec_id == AV_CODEC_ID_VP8) && !header &&
 216         (ogg_granule_to_timestamp(oggstream, granule) >
 217          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
 218          ogg_key_granule(oggstream, granule))) {
 219         if (oggstream->page.granule != -1)
 220             ogg_buffer_page(s, oggstream);
 221         flush = 1;
 222     }
 223
 224     // avoid a continued page
 225     if (!header && oggstream->page.size > 0 &&
 226         MAX_PAGE_SIZE - oggstream->page.size < size) {
 227         ogg_buffer_page(s, oggstream);
 228     }
 229
 230     for (i = 0; i < total_segments; ) {
 231         OGGPage *page = &oggstream->page;
 232
 233         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 234
 235         if (i && !page->segments_count)
 236             page->flags |= 1; // continued packet
 237
 238         memset(page->segments+page->segments_count, 255, segments - 1);
 239         page->segments_count += segments - 1;
 240
 241         len = FFMIN(size, segments*255);
 242         page->segments[page->segments_count++] = len - (segments-1)*255;
 243         memcpy(page->data+page->size, p, len);
 244         p += len;
 245         size -= len;
 246         i += segments;
 247         page->size += len;
 248
 249         if (i == total_segments)
 250             page->granule = granule;
 251
 252         {
 253             AVStream *st = s->streams[page->stream_index];
 254
 255             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 256                                          AV_TIME_BASE_Q);
 257             int64_t next  = av_rescale_q(ogg_granule_to_timestamp(oggstream, page->granule),
 258                                          st->time_base, AV_TIME_BASE_Q);
 259
 260             if (page->segments_count == 255) {
 261                 ogg_buffer_page(s, oggstream);
 262             } else if (!header) {
 263                 if ((ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
 264                     (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
 265                     ogg_buffer_page(s, oggstream);
 266                 }
 267             }
 268         }
 269     }
 270
 271     if (flush && oggstream->page.granule != -1)
 272         ogg_buffer_page(s, oggstream);
 273
 274     return 0;
 275 }
 276
 277 static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
 278                                         int *header_len, AVDictionary **m, int framing_bit,
 279                                         AVChapter **chapters, unsigned int nb_chapters)
 280 {
 281     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
 282     FFIOContext pb;
 283     int64_t size;
 284     uint8_t *p;
 285
 286     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 287
 288     size = offset + ff_vorbiscomment_length(*m, vendor, chapters, nb_chapters) + framing_bit;
 289     if (size > INT_MAX)
 290         return NULL;
 291     p = av_mallocz(size);
 292     if (!p)
 293         return NULL;
 294
 295     ffio_init_write_context(&pb, p + offset, size - offset);
 296     ff_vorbiscomment_write(&pb.pub, *m, vendor, chapters, nb_chapters);
 297     if (framing_bit)
 298         avio_w8(&pb.pub, 1);
 299
 300     *header_len = size;
 301     return p;
 302 }
 303
 304 static int ogg_build_flac_headers(AVCodecParameters *par,
 305                                   OGGStreamContext *oggstream, int bitexact,
 306                                   AVDictionary **m)
 307 {
 308     uint8_t *p;
 309
 310     if (par->extradata_size < FLAC_STREAMINFO_SIZE)
 311         return AVERROR(EINVAL);
 312
 313     // first packet: STREAMINFO
 314     oggstream->header_len[0] = 51;
 315     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
 316     p = oggstream->header[0];
 317     if (!p)
 318         return AVERROR(ENOMEM);
 319     bytestream_put_byte(&p, 0x7F);
 320     bytestream_put_buffer(&p, "FLAC", 4);
 321     bytestream_put_byte(&p, 1); // major version
 322     bytestream_put_byte(&p, 0); // minor version
 323     bytestream_put_be16(&p, 1); // headers packets without this one
 324     bytestream_put_buffer(&p, "fLaC", 4);
 325     bytestream_put_byte(&p, 0x00); // streaminfo
 326     bytestream_put_be24(&p, 34);
 327     bytestream_put_buffer(&p, par->extradata, FLAC_STREAMINFO_SIZE);
 328
 329     // second packet: VorbisComment
 330     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0, NULL, 0);
 331     if (!p)
 332         return AVERROR(ENOMEM);
 333     oggstream->header[1] = p;
 334     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
 335     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
 336
 337     return 0;
 338 }
 339
 340 #define SPEEX_HEADER_SIZE 80
 341
 342 static int ogg_build_speex_headers(AVCodecParameters *par,
 343                                    OGGStreamContext *oggstream, int bitexact,
 344                                    AVDictionary **m)
 345 {
 346     uint8_t *p;
 347
 348     if (par->extradata_size < SPEEX_HEADER_SIZE)
 349         return AVERROR_INVALIDDATA;
 350
 351     // first packet: Speex header
 352     p = av_mallocz(SPEEX_HEADER_SIZE);
 353     if (!p)
 354         return AVERROR(ENOMEM);
 355     oggstream->header[0] = p;
 356     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
 357     bytestream_put_buffer(&p, par->extradata, SPEEX_HEADER_SIZE);
 358     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
 359
 360     // second packet: VorbisComment
 361     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0, NULL, 0);
 362     if (!p)
 363         return AVERROR(ENOMEM);
 364     oggstream->header[1] = p;
 365
 366     return 0;
 367 }
 368
 369 #define OPUS_HEADER_SIZE 19
 370
 371 static int ogg_build_opus_headers(AVCodecParameters *par,
 372                                   OGGStreamContext *oggstream, int bitexact,
 373                                   AVDictionary **m, AVChapter **chapters,
 374                                   unsigned int nb_chapters)
 375 {
 376     uint8_t *p;
 377
 378     if (par->extradata_size < OPUS_HEADER_SIZE)
 379         return AVERROR_INVALIDDATA;
 380
 381     /* first packet: Opus header */
 382     p = av_mallocz(par->extradata_size);
 383     if (!p)
 384         return AVERROR(ENOMEM);
 385     oggstream->header[0] = p;
 386     oggstream->header_len[0] = par->extradata_size;
 387     bytestream_put_buffer(&p, par->extradata, par->extradata_size);
 388
 389     /* second packet: VorbisComment */
 390     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0, chapters, nb_chapters);
 391     if (!p)
 392         return AVERROR(ENOMEM);
 393     oggstream->header[1] = p;
 394     bytestream_put_buffer(&p, "OpusTags", 8);
 395
 396     return 0;
 397 }
 398
 399 #define VP8_HEADER_SIZE 26
 400
 401 static int ogg_build_vp8_headers(AVFormatContext *s, AVStream *st,
 402                                  OGGStreamContext *oggstream, int bitexact)
 403 {
 404     AVCodecParameters *par = st->codecpar;
 405     uint8_t *p;
 406
 407     /* first packet: VP8 header */
 408     p = av_mallocz(VP8_HEADER_SIZE);
 409     if (!p)
 410         return AVERROR(ENOMEM);
 411     oggstream->header[0] = p;
 412     oggstream->header_len[0] = VP8_HEADER_SIZE;
 413     bytestream_put_byte(&p, 0x4f); // HDRID
 414     bytestream_put_buffer(&p, "VP80", 4); // Identifier
 415     bytestream_put_byte(&p, 1); // HDRTYP
 416     bytestream_put_byte(&p, 1); // VMAJ
 417     bytestream_put_byte(&p, 0); // VMIN
 418     bytestream_put_be16(&p, par->width);
 419     bytestream_put_be16(&p, par->height);
 420     bytestream_put_be24(&p, par->sample_aspect_ratio.num);
 421     bytestream_put_be24(&p, par->sample_aspect_ratio.den);
 422     if (st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0) {
 423         // OggVP8 requires pts to increase by 1 per visible frame, so use the least common
 424         // multiple framerate if available.
 425         av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 426                st->time_base.num, st->time_base.den,
 427                st->r_frame_rate.den, st->r_frame_rate.num);
 428         avpriv_set_pts_info(st, 64, st->r_frame_rate.den, st->r_frame_rate.num);
 429     }
 430     bytestream_put_be32(&p, st->time_base.den);
 431     bytestream_put_be32(&p, st->time_base.num);
 432
 433     /* optional second packet: VorbisComment */
 434     if (av_dict_get(st->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
 435         p = ogg_write_vorbiscomment(7, bitexact, &oggstream->header_len[1], &st->metadata, 0, NULL, 0);
 436         if (!p)
 437             return AVERROR(ENOMEM);
 438         oggstream->header[1] = p;
 439         bytestream_put_byte(&p, 0x4f); // HDRID
 440         bytestream_put_buffer(&p, "VP80", 4); // Identifier
 441         bytestream_put_byte(&p, 2); // HDRTYP
 442         bytestream_put_byte(&p, 0x20);
 443     }
 444
 445     oggstream->isvp8 = 1;
 446
 447     return 0;
 448 }
 449
 450 static void ogg_write_pages(AVFormatContext *s, int flush)
 451 {
 452     OGGContext *ogg = s->priv_data;
 453     OGGPageList *next, *p;
 454
 455     if (!ogg->page_list)
 456         return;
 457
 458     for (p = ogg->page_list; p; ) {
 459         OGGStreamContext *oggstream =
 460             s->streams[p->page.stream_index]->priv_data;
 461         if (oggstream->page_count < 2 && !flush)
 462             break;
 463         ogg_write_page(s, &p->page,
 464                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
 465         next = p->next;
 466         av_freep(&p);
 467         p = next;
 468     }
 469     ogg->page_list = p;
 470 }
 471
 472 static int ogg_init(AVFormatContext *s)
 473 {
 474     OGGContext *ogg = s->priv_data;
 475     OGGStreamContext *oggstream = NULL;
 476     int i, j;
 477
 478     if (ogg->pref_size)
 479         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
 480
 481     for (i = 0; i < s->nb_streams; i++) {
 482         AVStream *st = s->streams[i];
 483         unsigned serial_num = i + ogg->serial_offset;
 484
 485         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 486             if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 487                 /* Opus requires a fixed 48kHz clock */
 488                 avpriv_set_pts_info(st, 64, 1, 48000);
 489             else
 490                 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 491         }
 492
 493         if (st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
 494             st->codecpar->codec_id != AV_CODEC_ID_THEORA &&
 495             st->codecpar->codec_id != AV_CODEC_ID_SPEEX  &&
 496             st->codecpar->codec_id != AV_CODEC_ID_FLAC   &&
 497             st->codecpar->codec_id != AV_CODEC_ID_OPUS   &&
 498             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 499             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 500             return AVERROR(EINVAL);
 501         }
 502
 503         if ((!st->codecpar->extradata || !st->codecpar->extradata_size) &&
 504             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 505             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 506             return AVERROR_INVALIDDATA;
 507         }
 508         oggstream = av_mallocz(sizeof(*oggstream));
 509         if (!oggstream)
 510             return AVERROR(ENOMEM);
 511
 512         oggstream->page.stream_index = i;
 513
 514         if (!(s->flags & AVFMT_FLAG_BITEXACT))
 515             do {
 516                 serial_num = av_get_random_seed();
 517                 for (j = 0; j < i; j++) {
 518                     OGGStreamContext *sc = s->streams[j]->priv_data;
 519                     if (serial_num == sc->serial_num)
 520                         break;
 521                 }
 522             } while (j < i);
 523         oggstream->serial_num = serial_num;
 524
 525         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
 526
 527         st->priv_data = oggstream;
 528         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
 529             int err = ogg_build_flac_headers(st->codecpar, oggstream,
 530                                              s->flags & AVFMT_FLAG_BITEXACT,
 531                                              &st->metadata);
 532             if (err) {
 533                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
 534                 return err;
 535             }
 536         } else if (st->codecpar->codec_id == AV_CODEC_ID_SPEEX) {
 537             int err = ogg_build_speex_headers(st->codecpar, oggstream,
 538                                               s->flags & AVFMT_FLAG_BITEXACT,
 539                                               &st->metadata);
 540             if (err) {
 541                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 542                 return err;
 543             }
 544         } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
 545             int err = ogg_build_opus_headers(st->codecpar, oggstream,
 546                                              s->flags & AVFMT_FLAG_BITEXACT,
 547                                              &st->metadata, s->chapters, s->nb_chapters);
 548             if (err) {
 549                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 550                 return err;
 551             }
 552         } else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 553             int err = ogg_build_vp8_headers(s, st, oggstream,
 554                                             s->flags & AVFMT_FLAG_BITEXACT);
 555             if (err) {
 556                 av_log(s, AV_LOG_ERROR, "Error writing VP8 headers\n");
 557                 return err;
 558             }
 559         } else {
 560             uint8_t *p;
 561             const char *cstr = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 562             int header_type = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 563             int framing_bit = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 564
 565             if (avpriv_split_xiph_headers(st->codecpar->extradata, st->codecpar->extradata_size,
 566                                       st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 567                                       (const uint8_t**)oggstream->header, oggstream->header_len) < 0) {
 568                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 569                 oggstream->header[1] = NULL;
 570                 return AVERROR_INVALIDDATA;
 571             }
 572
 573             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
 574                                         &oggstream->header_len[1], &st->metadata,
 575                                         framing_bit, NULL, 0);
 576             oggstream->header[1] = p;
 577             if (!p)
 578                 return AVERROR(ENOMEM);
 579
 580             bytestream_put_byte(&p, header_type);
 581             bytestream_put_buffer(&p, cstr, 6);
 582
 583             if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 584                 int den = AV_RB32(oggstream->header[0] + 22), num = AV_RB32(oggstream->header[0] + 26);
 585                 /* Make sure to use time base stored in the Theora stream header to write
 586                    correct timestamps */
 587                 if (st->time_base.num != num || st->time_base.den != den) {
 588                     av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 589                            st->time_base.num, st->time_base.den, num, den);
 590                     avpriv_set_pts_info(st, 64, num, den);
 591                 }
 592                 /** KFGSHIFT is the width of the less significant section of the granule position
 593                     The less significant section is the frame count since the last keyframe */
 594                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 595                 oggstream->vrev = oggstream->header[0][9];
 596                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 597                        oggstream->kfgshift, oggstream->vrev);
 598             }
 599         }
 600     }
 601
 602     return 0;
 603 }
 604
 605 static int ogg_write_header(AVFormatContext *s)
 606 {
 607     OGGStreamContext *oggstream = NULL;
 608     int i, j;
 609
 610     for (j = 0; j < s->nb_streams; j++) {
 611         oggstream = s->streams[j]->priv_data;
 612         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 613                         oggstream->header_len[0], 0, 1);
 614         oggstream->page.flags |= 2; // bos
 615         ogg_buffer_page(s, oggstream);
 616     }
 617     for (j = 0; j < s->nb_streams; j++) {
 618         AVStream *st = s->streams[j];
 619         oggstream = st->priv_data;
 620         for (i = 1; i < 3; i++) {
 621             if (oggstream->header_len[i])
 622                 ogg_buffer_data(s, st, oggstream->header[i],
 623                                 oggstream->header_len[i], 0, 1);
 624         }
 625         ogg_buffer_page(s, oggstream);
 626     }
 627
 628     oggstream->page.start_granule = AV_NOPTS_VALUE;
 629
 630     ogg_write_pages(s, 2);
 631
 632     return 0;
 633 }
 634
 635 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 636 {
 637     AVStream *st = s->streams[pkt->stream_index];
 638     OGGStreamContext *oggstream = st->priv_data;
 639     int ret;
 640     int64_t granule;
 641
 642     if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 643         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 644         int pframe_count;
 645         if (pkt->flags & AV_PKT_FLAG_KEY)
 646             oggstream->last_kf_pts = pts;
 647         pframe_count = pts - oggstream->last_kf_pts;
 648         // prevent frame count from overflow if key frame flag is not set
 649         if (pframe_count >= (1<<oggstream->kfgshift)) {
 650             oggstream->last_kf_pts += pframe_count;
 651             pframe_count = 0;
 652         }
 653         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 654     } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 655         granule = pkt->pts + pkt->duration +
 656                   av_rescale_q(st->codecpar->initial_padding,
 657                                (AVRational){ 1, st->codecpar->sample_rate },
 658                                st->time_base);
 659     else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 660         int64_t pts, invcnt, dist;
 661         int visible;
 662
 663         visible = (pkt->data[0] >> 4) & 1;
 664         pts     = pkt->pts + pkt->duration;
 665         invcnt  = (oggstream->last_granule >> 30) & 3;
 666         invcnt  = visible ? 3 : (invcnt == 3 ? 0 : invcnt + 1);
 667         dist    = (pkt->flags & AV_PKT_FLAG_KEY) ? 0 : ((oggstream->last_granule >> 3) & 0x07ffffff) + 1;
 668
 669         granule = (pts << 32) | (invcnt << 30) | (dist << 3);
 670     } else
 671         granule = pkt->pts + pkt->duration;
 672
 673     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 674         oggstream->page.start_granule = pkt->pts;
 675
 676     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 677     if (ret < 0)
 678         return ret;
 679
 680     ogg_write_pages(s, 0);
 681
 682     oggstream->last_granule = granule;
 683
 684     return 0;
 685 }
 686
 687 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 688 {
 689     int i;
 690
 691     if (pkt)
 692         return pkt->size ? ogg_write_packet_internal(s, pkt) : 0;
 693
 694     for (i = 0; i < s->nb_streams; i++) {
 695         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 696         if (oggstream->page.segments_count)
 697             ogg_buffer_page(s, oggstream);
 698     }
 699
 700     ogg_write_pages(s, 2);
 701     return 1;
 702 }
 703
 704 static int ogg_write_trailer(AVFormatContext *s)
 705 {
 706     int i;
 707
 708     /* flush current page if needed */
 709     for (i = 0; i < s->nb_streams; i++) {
 710         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 711
 712         if (oggstream->page.size > 0)
 713             ogg_buffer_page(s, oggstream);
 714     }
 715
 716     ogg_write_pages(s, 1);
 717
 718     return 0;
 719 }
 720
 721 static void ogg_free(AVFormatContext *s)
 722 {
 723     OGGContext *ogg = s->priv_data;
 724     OGGPageList *p = ogg->page_list;
 725     int i;
 726
 727     for (i = 0; i < s->nb_streams; i++) {
 728         AVStream *st = s->streams[i];
 729         OGGStreamContext *oggstream = st->priv_data;
 730         if (!oggstream)
 731             continue;
 732         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
 733             st->codecpar->codec_id == AV_CODEC_ID_SPEEX ||
 734             st->codecpar->codec_id == AV_CODEC_ID_OPUS ||
 735             st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 736             av_freep(&oggstream->header[0]);
 737         }
 738         av_freep(&oggstream->header[1]);
 739     }
 740
 741     while (p) {
 742         OGGPageList *next = p->next;
 743         av_free(p);
 744         p = next;
 745     }
 746     ogg->page_list = NULL;
 747 }
 748
 749 #if CONFIG_OGG_MUXER
 750 const FFOutputFormat ff_ogg_muxer = {
 751     .p.name            = "ogg",
 752     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg"),
 753     .p.mime_type       = "application/ogg",
 754     .p.extensions      = "ogg"
 755 #if !CONFIG_OGV_MUXER
 756                          ",ogv"
 757 #endif
 758 #if !CONFIG_SPX_MUXER
 759                          ",spx"
 760 #endif
 761 #if !CONFIG_OPUS_MUXER
 762                          ",opus"
 763 #endif
 764                          ,
 765     .priv_data_size    = sizeof(OGGContext),
 766     .p.audio_codec     = CONFIG_LIBVORBIS_ENCODER ?
 767                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 768     .p.video_codec     = AV_CODEC_ID_THEORA,
 769     .init              = ogg_init,
 770     .write_header      = ogg_write_header,
 771     .write_packet      = ogg_write_packet,
 772     .write_trailer     = ogg_write_trailer,
 773     .deinit            = ogg_free,
 774 #if FF_API_ALLOW_FLUSH
 775     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 776 #else
 777     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT,
 778 #endif
 779     .p.priv_class      = &ogg_muxer_class,
 780     .flags_internal    = FF_FMT_ALLOW_FLUSH,
 781 };
 782 #endif
 783
 784 #if CONFIG_OGA_MUXER
 785 const FFOutputFormat ff_oga_muxer = {
 786     .p.name            = "oga",
 787     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Audio"),
 788     .p.mime_type       = "audio/ogg",
 789     .p.extensions      = "oga",
 790     .priv_data_size    = sizeof(OGGContext),
 791     .p.audio_codec     = AV_CODEC_ID_FLAC,
 792     .init              = ogg_init,
 793     .write_header      = ogg_write_header,
 794     .write_packet      = ogg_write_packet,
 795     .write_trailer     = ogg_write_trailer,
 796     .deinit            = ogg_free,
 797 #if FF_API_ALLOW_FLUSH
 798     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 799 #else
 800     .p.flags           = AVFMT_TS_NEGATIVE,
 801 #endif
 802     .p.priv_class      = &ogg_muxer_class,
 803     .flags_internal    = FF_FMT_ALLOW_FLUSH,
 804 };
 805 #endif
 806
 807 #if CONFIG_OGV_MUXER
 808 const FFOutputFormat ff_ogv_muxer = {
 809     .p.name            = "ogv",
 810     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Video"),
 811     .p.mime_type       = "video/ogg",
 812     .p.extensions      = "ogv",
 813     .priv_data_size    = sizeof(OGGContext),
 814     .p.audio_codec     = CONFIG_LIBVORBIS_ENCODER ?
 815                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 816     .p.video_codec     = CONFIG_LIBTHEORA_ENCODER ?
 817                          AV_CODEC_ID_THEORA : AV_CODEC_ID_VP8,
 818     .init              = ogg_init,
 819     .write_header      = ogg_write_header,
 820     .write_packet      = ogg_write_packet,
 821     .write_trailer     = ogg_write_trailer,
 822     .deinit            = ogg_free,
 823 #if FF_API_ALLOW_FLUSH
 824     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 825 #else
 826     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT,
 827 #endif
 828     .p.priv_class      = &ogg_muxer_class,
 829     .flags_internal    = FF_FMT_ALLOW_FLUSH,
 830 };
 831 #endif
 832
 833 #if CONFIG_SPX_MUXER
 834 const FFOutputFormat ff_spx_muxer = {
 835     .p.name            = "spx",
 836     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Speex"),
 837     .p.mime_type       = "audio/ogg",
 838     .p.extensions      = "spx",
 839     .priv_data_size    = sizeof(OGGContext),
 840     .p.audio_codec     = AV_CODEC_ID_SPEEX,
 841     .init              = ogg_init,
 842     .write_header      = ogg_write_header,
 843     .write_packet      = ogg_write_packet,
 844     .write_trailer     = ogg_write_trailer,
 845     .deinit            = ogg_free,
 846 #if FF_API_ALLOW_FLUSH
 847     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 848 #else
 849     .p.flags           = AVFMT_TS_NEGATIVE,
 850 #endif
 851     .p.priv_class      = &ogg_muxer_class,
 852     .flags_internal    = FF_FMT_ALLOW_FLUSH,
 853 };
 854 #endif
 855
 856 #if CONFIG_OPUS_MUXER
 857 const FFOutputFormat ff_opus_muxer = {
 858     .p.name            = "opus",
 859     .p.long_name       = NULL_IF_CONFIG_SMALL("Ogg Opus"),
 860     .p.mime_type       = "audio/ogg",
 861     .p.extensions      = "opus",
 862     .priv_data_size    = sizeof(OGGContext),
 863     .p.audio_codec     = AV_CODEC_ID_OPUS,
 864     .init              = ogg_init,
 865     .write_header      = ogg_write_header,
 866     .write_packet      = ogg_write_packet,
 867     .write_trailer     = ogg_write_trailer,
 868     .deinit            = ogg_free,
 869 #if FF_API_ALLOW_FLUSH
 870     .p.flags           = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 871 #else
 872     .p.flags           = AVFMT_TS_NEGATIVE,
 873 #endif
 874     .p.priv_class      = &ogg_muxer_class,
 875     .flags_internal    = FF_FMT_ALLOW_FLUSH,
 876 };
 877 #endif