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_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
 103 {
 104     int64_t pos = avio_tell(pb);
 105     uint32_t checksum = ffio_get_checksum(pb);
 106     avio_seek(pb, crc_offset, SEEK_SET);
 107     avio_wb32(pb, checksum);
 108     avio_seek(pb, pos, SEEK_SET);
 109 }
 110
 111 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
 112 {
 113     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
 114     AVIOContext *pb;
 115     int64_t crc_offset;
 116     int ret, size;
 117     uint8_t *buf;
 118
 119     ret = avio_open_dyn_buf(&pb);
 120     if (ret < 0)
 121         return ret;
 122     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
 123     ffio_wfourcc(pb, "OggS");
 124     avio_w8(pb, 0);
 125     avio_w8(pb, page->flags | extra_flags);
 126     avio_wl64(pb, page->granule);
 127     avio_wl32(pb, oggstream->serial_num);
 128     avio_wl32(pb, oggstream->page_counter++);
 129     crc_offset = avio_tell(pb);
 130     avio_wl32(pb, 0); // crc
 131     avio_w8(pb, page->segments_count);
 132     avio_write(pb, page->segments, page->segments_count);
 133     avio_write(pb, page->data, page->size);
 134
 135     ogg_update_checksum(s, pb, crc_offset);
 136     avio_flush(pb);
 137
 138     size = avio_close_dyn_buf(pb, &buf);
 139     if (size < 0)
 140         return size;
 141
 142     avio_write(s->pb, buf, size);
 143     avio_flush(s->pb);
 144     av_free(buf);
 145     oggstream->page_count--;
 146     return 0;
 147 }
 148
 149 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
 150 {
 151     return (oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1))) ||
 152            (oggstream->isvp8    && !((granule >> 3) & 0x07ffffff));
 153 }
 154
 155 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 156 {
 157     if (oggstream->kfgshift)
 158         return (granule>>oggstream->kfgshift) +
 159             (granule & ((1<<oggstream->kfgshift)-1));
 160     else if (oggstream->isvp8)
 161         return granule >> 32;
 162     else
 163         return granule;
 164 }
 165
 166 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 167 {
 168     AVStream *st2 = s->streams[next->stream_index];
 169     AVStream *st  = s->streams[page->stream_index];
 170     int64_t next_granule, cur_granule;
 171
 172     if (next->granule == -1 || page->granule == -1)
 173         return 0;
 174
 175     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 176                                 st2->time_base, AV_TIME_BASE_Q);
 177     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 178                                 st ->time_base, AV_TIME_BASE_Q);
 179     return next_granule > cur_granule;
 180 }
 181
 182 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 183 {
 184     oggstream->page.granule = -1;
 185     oggstream->page.flags = 0;
 186     oggstream->page.segments_count = 0;
 187     oggstream->page.size = 0;
 188     return 0;
 189 }
 190
 191 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 192 {
 193     OGGContext *ogg = s->priv_data;
 194     OGGPageList **p = &ogg->page_list;
 195     OGGPageList *l = av_mallocz(sizeof(*l));
 196
 197     if (!l)
 198         return AVERROR(ENOMEM);
 199     l->page = oggstream->page;
 200
 201     oggstream->page.start_granule = ogg_granule_to_timestamp(oggstream, oggstream->page.granule);
 202     oggstream->page_count++;
 203     ogg_reset_cur_page(oggstream);
 204
 205     while (*p) {
 206         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 207             break;
 208         p = &(*p)->next;
 209     }
 210     l->next = *p;
 211     *p = l;
 212
 213     return 0;
 214 }
 215
 216 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 217                            uint8_t *data, unsigned size, int64_t granule,
 218                            int header)
 219 {
 220     OGGStreamContext *oggstream = st->priv_data;
 221     OGGContext *ogg = s->priv_data;
 222     int total_segments = size / 255 + 1;
 223     uint8_t *p = data;
 224     int i, segments, len, flush = 0;
 225
 226     // Handles VFR by flushing page because this frame needs to have a timestamp
 227     // For theora and VP8, keyframes also need to have a timestamp to correctly mark
 228     // them as such, otherwise seeking will not work correctly at the very
 229     // least with old libogg versions.
 230     // Do not try to flush header packets though, that will create broken files.
 231     if ((st->codecpar->codec_id == AV_CODEC_ID_THEORA || st->codecpar->codec_id == AV_CODEC_ID_VP8) && !header &&
 232         (ogg_granule_to_timestamp(oggstream, granule) >
 233          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
 234          ogg_key_granule(oggstream, granule))) {
 235         if (oggstream->page.granule != -1)
 236             ogg_buffer_page(s, oggstream);
 237         flush = 1;
 238     }
 239
 240     // avoid a continued page
 241     if (!header && oggstream->page.size > 0 &&
 242         MAX_PAGE_SIZE - oggstream->page.size < size) {
 243         ogg_buffer_page(s, oggstream);
 244     }
 245
 246     for (i = 0; i < total_segments; ) {
 247         OGGPage *page = &oggstream->page;
 248
 249         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 250
 251         if (i && !page->segments_count)
 252             page->flags |= 1; // continued packet
 253
 254         memset(page->segments+page->segments_count, 255, segments - 1);
 255         page->segments_count += segments - 1;
 256
 257         len = FFMIN(size, segments*255);
 258         page->segments[page->segments_count++] = len - (segments-1)*255;
 259         memcpy(page->data+page->size, p, len);
 260         p += len;
 261         size -= len;
 262         i += segments;
 263         page->size += len;
 264
 265         if (i == total_segments)
 266             page->granule = granule;
 267
 268         {
 269             AVStream *st = s->streams[page->stream_index];
 270
 271             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 272                                          AV_TIME_BASE_Q);
 273             int64_t next  = av_rescale_q(ogg_granule_to_timestamp(oggstream, page->granule),
 274                                          st->time_base, AV_TIME_BASE_Q);
 275
 276             if (page->segments_count == 255) {
 277                 ogg_buffer_page(s, oggstream);
 278             } else if (!header) {
 279                 if ((ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
 280                     (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
 281                     ogg_buffer_page(s, oggstream);
 282                 }
 283             }
 284         }
 285     }
 286
 287     if (flush && oggstream->page.granule != -1)
 288         ogg_buffer_page(s, oggstream);
 289
 290     return 0;
 291 }
 292
 293 static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
 294                                         int *header_len, AVDictionary **m, int framing_bit)
 295 {
 296     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
 297     int64_t size;
 298     uint8_t *p, *p0;
 299
 300     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 301
 302     size = offset + ff_vorbiscomment_length(*m, vendor) + framing_bit;
 303     if (size > INT_MAX)
 304         return NULL;
 305     p = av_mallocz(size);
 306     if (!p)
 307         return NULL;
 308     p0 = p;
 309
 310     p += offset;
 311     ff_vorbiscomment_write(&p, m, vendor);
 312     if (framing_bit)
 313         bytestream_put_byte(&p, 1);
 314
 315     *header_len = size;
 316     return p0;
 317 }
 318
 319 static int ogg_build_flac_headers(AVCodecParameters *par,
 320                                   OGGStreamContext *oggstream, int bitexact,
 321                                   AVDictionary **m)
 322 {
 323     uint8_t *p;
 324
 325     if (par->extradata_size < FLAC_STREAMINFO_SIZE)
 326         return AVERROR(EINVAL);
 327
 328     // first packet: STREAMINFO
 329     oggstream->header_len[0] = 51;
 330     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
 331     p = oggstream->header[0];
 332     if (!p)
 333         return AVERROR(ENOMEM);
 334     bytestream_put_byte(&p, 0x7F);
 335     bytestream_put_buffer(&p, "FLAC", 4);
 336     bytestream_put_byte(&p, 1); // major version
 337     bytestream_put_byte(&p, 0); // minor version
 338     bytestream_put_be16(&p, 1); // headers packets without this one
 339     bytestream_put_buffer(&p, "fLaC", 4);
 340     bytestream_put_byte(&p, 0x00); // streaminfo
 341     bytestream_put_be24(&p, 34);
 342     bytestream_put_buffer(&p, par->extradata, FLAC_STREAMINFO_SIZE);
 343
 344     // second packet: VorbisComment
 345     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
 346     if (!p)
 347         return AVERROR(ENOMEM);
 348     oggstream->header[1] = p;
 349     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
 350     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
 351
 352     return 0;
 353 }
 354
 355 #define SPEEX_HEADER_SIZE 80
 356
 357 static int ogg_build_speex_headers(AVCodecParameters *par,
 358                                    OGGStreamContext *oggstream, int bitexact,
 359                                    AVDictionary **m)
 360 {
 361     uint8_t *p;
 362
 363     if (par->extradata_size < SPEEX_HEADER_SIZE)
 364         return AVERROR_INVALIDDATA;
 365
 366     // first packet: Speex header
 367     p = av_mallocz(SPEEX_HEADER_SIZE);
 368     if (!p)
 369         return AVERROR(ENOMEM);
 370     oggstream->header[0] = p;
 371     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
 372     bytestream_put_buffer(&p, par->extradata, SPEEX_HEADER_SIZE);
 373     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
 374
 375     // second packet: VorbisComment
 376     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
 377     if (!p)
 378         return AVERROR(ENOMEM);
 379     oggstream->header[1] = p;
 380
 381     return 0;
 382 }
 383
 384 #define OPUS_HEADER_SIZE 19
 385
 386 static int ogg_build_opus_headers(AVCodecParameters *par,
 387                                   OGGStreamContext *oggstream, int bitexact,
 388                                   AVDictionary **m)
 389 {
 390     uint8_t *p;
 391
 392     if (par->extradata_size < OPUS_HEADER_SIZE)
 393         return AVERROR_INVALIDDATA;
 394
 395     /* first packet: Opus header */
 396     p = av_mallocz(par->extradata_size);
 397     if (!p)
 398         return AVERROR(ENOMEM);
 399     oggstream->header[0] = p;
 400     oggstream->header_len[0] = par->extradata_size;
 401     bytestream_put_buffer(&p, par->extradata, par->extradata_size);
 402
 403     /* second packet: VorbisComment */
 404     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
 405     if (!p)
 406         return AVERROR(ENOMEM);
 407     oggstream->header[1] = p;
 408     bytestream_put_buffer(&p, "OpusTags", 8);
 409
 410     return 0;
 411 }
 412
 413 #define VP8_HEADER_SIZE 26
 414
 415 static int ogg_build_vp8_headers(AVFormatContext *s, AVStream *st,
 416                                  OGGStreamContext *oggstream, int bitexact)
 417 {
 418     AVCodecParameters *par = st->codecpar;
 419     uint8_t *p;
 420
 421     /* first packet: VP8 header */
 422     p = av_mallocz(VP8_HEADER_SIZE);
 423     if (!p)
 424         return AVERROR(ENOMEM);
 425     oggstream->header[0] = p;
 426     oggstream->header_len[0] = VP8_HEADER_SIZE;
 427     bytestream_put_byte(&p, 0x4f); // HDRID
 428     bytestream_put_buffer(&p, "VP80", 4); // Identifier
 429     bytestream_put_byte(&p, 1); // HDRTYP
 430     bytestream_put_byte(&p, 1); // VMAJ
 431     bytestream_put_byte(&p, 0); // VMIN
 432     bytestream_put_be16(&p, par->width);
 433     bytestream_put_be16(&p, par->height);
 434     bytestream_put_be24(&p, par->sample_aspect_ratio.num);
 435     bytestream_put_be24(&p, par->sample_aspect_ratio.den);
 436     if (st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0) {
 437         // OggVP8 requires pts to increase by 1 per visible frame, so use the least common
 438         // multiple framerate if available.
 439         av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 440                st->time_base.num, st->time_base.den,
 441                st->r_frame_rate.den, st->r_frame_rate.num);
 442         avpriv_set_pts_info(st, 64, st->r_frame_rate.den, st->r_frame_rate.num);
 443     }
 444     bytestream_put_be32(&p, st->time_base.den);
 445     bytestream_put_be32(&p, st->time_base.num);
 446
 447     /* optional second packet: VorbisComment */
 448     if (av_dict_get(st->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
 449         p = ogg_write_vorbiscomment(7, bitexact, &oggstream->header_len[1], &st->metadata, 0);
 450         if (!p)
 451             return AVERROR(ENOMEM);
 452         oggstream->header[1] = p;
 453         bytestream_put_byte(&p, 0x4f); // HDRID
 454         bytestream_put_buffer(&p, "VP80", 4); // Identifier
 455         bytestream_put_byte(&p, 2); // HDRTYP
 456         bytestream_put_byte(&p, 0x20);
 457     }
 458
 459     oggstream->isvp8 = 1;
 460
 461     return 0;
 462 }
 463
 464 static void ogg_write_pages(AVFormatContext *s, int flush)
 465 {
 466     OGGContext *ogg = s->priv_data;
 467     OGGPageList *next, *p;
 468
 469     if (!ogg->page_list)
 470         return;
 471
 472     for (p = ogg->page_list; p; ) {
 473         OGGStreamContext *oggstream =
 474             s->streams[p->page.stream_index]->priv_data;
 475         if (oggstream->page_count < 2 && !flush)
 476             break;
 477         ogg_write_page(s, &p->page,
 478                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
 479         next = p->next;
 480         av_freep(&p);
 481         p = next;
 482     }
 483     ogg->page_list = p;
 484 }
 485
 486 static int ogg_init(AVFormatContext *s)
 487 {
 488     OGGContext *ogg = s->priv_data;
 489     OGGStreamContext *oggstream = NULL;
 490     int i, j;
 491
 492     if (ogg->pref_size)
 493         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
 494
 495     for (i = 0; i < s->nb_streams; i++) {
 496         AVStream *st = s->streams[i];
 497         unsigned serial_num = i + ogg->serial_offset;
 498
 499         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 500             if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 501                 /* Opus requires a fixed 48kHz clock */
 502                 avpriv_set_pts_info(st, 64, 1, 48000);
 503             else
 504                 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 505         }
 506
 507         if (st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
 508             st->codecpar->codec_id != AV_CODEC_ID_THEORA &&
 509             st->codecpar->codec_id != AV_CODEC_ID_SPEEX  &&
 510             st->codecpar->codec_id != AV_CODEC_ID_FLAC   &&
 511             st->codecpar->codec_id != AV_CODEC_ID_OPUS   &&
 512             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 513             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 514             return AVERROR(EINVAL);
 515         }
 516
 517         if ((!st->codecpar->extradata || !st->codecpar->extradata_size) &&
 518             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 519             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 520             return AVERROR_INVALIDDATA;
 521         }
 522         oggstream = av_mallocz(sizeof(*oggstream));
 523         if (!oggstream)
 524             return AVERROR(ENOMEM);
 525
 526         oggstream->page.stream_index = i;
 527
 528         if (!(s->flags & AVFMT_FLAG_BITEXACT))
 529             do {
 530                 serial_num = av_get_random_seed();
 531                 for (j = 0; j < i; j++) {
 532                     OGGStreamContext *sc = s->streams[j]->priv_data;
 533                     if (serial_num == sc->serial_num)
 534                         break;
 535                 }
 536             } while (j < i);
 537         oggstream->serial_num = serial_num;
 538
 539         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
 540
 541         st->priv_data = oggstream;
 542         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
 543             int err = ogg_build_flac_headers(st->codecpar, oggstream,
 544                                              s->flags & AVFMT_FLAG_BITEXACT,
 545                                              &st->metadata);
 546             if (err) {
 547                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
 548                 av_freep(&st->priv_data);
 549                 return err;
 550             }
 551         } else if (st->codecpar->codec_id == AV_CODEC_ID_SPEEX) {
 552             int err = ogg_build_speex_headers(st->codecpar, oggstream,
 553                                               s->flags & AVFMT_FLAG_BITEXACT,
 554                                               &st->metadata);
 555             if (err) {
 556                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 557                 av_freep(&st->priv_data);
 558                 return err;
 559             }
 560         } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
 561             int err = ogg_build_opus_headers(st->codecpar, oggstream,
 562                                              s->flags & AVFMT_FLAG_BITEXACT,
 563                                              &st->metadata);
 564             if (err) {
 565                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 566                 av_freep(&st->priv_data);
 567                 return err;
 568             }
 569         } else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 570             int err = ogg_build_vp8_headers(s, st, oggstream,
 571                                             s->flags & AVFMT_FLAG_BITEXACT);
 572             if (err) {
 573                 av_log(s, AV_LOG_ERROR, "Error writing VP8 headers\n");
 574                 av_freep(&st->priv_data);
 575                 return err;
 576             }
 577         } else {
 578             uint8_t *p;
 579             const char *cstr = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 580             int header_type = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 581             int framing_bit = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 582
 583             if (avpriv_split_xiph_headers(st->codecpar->extradata, st->codecpar->extradata_size,
 584                                       st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 585                                       (const uint8_t**)oggstream->header, oggstream->header_len) < 0) {
 586                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 587                 av_freep(&st->priv_data);
 588                 return AVERROR_INVALIDDATA;
 589             }
 590
 591             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
 592                                         &oggstream->header_len[1], &st->metadata,
 593                                         framing_bit);
 594             oggstream->header[1] = p;
 595             if (!p)
 596                 return AVERROR(ENOMEM);
 597
 598             bytestream_put_byte(&p, header_type);
 599             bytestream_put_buffer(&p, cstr, 6);
 600
 601             if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 602                 int den = AV_RB32(oggstream->header[0] + 22), num = AV_RB32(oggstream->header[0] + 26);
 603                 /* Make sure to use time base stored in the Theora stream header to write
 604                    correct timestamps */
 605                 if (st->time_base.num != num || st->time_base.den != den) {
 606                     av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 607                            st->time_base.num, st->time_base.den, num, den);
 608                     avpriv_set_pts_info(st, 64, num, den);
 609                 }
 610                 /** KFGSHIFT is the width of the less significant section of the granule position
 611                     The less significant section is the frame count since the last keyframe */
 612                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 613                 oggstream->vrev = oggstream->header[0][9];
 614                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 615                        oggstream->kfgshift, oggstream->vrev);
 616             }
 617         }
 618     }
 619
 620     return 0;
 621 }
 622
 623 static int ogg_write_header(AVFormatContext *s)
 624 {
 625     OGGStreamContext *oggstream = NULL;
 626     int i, j;
 627
 628     for (j = 0; j < s->nb_streams; j++) {
 629         oggstream = s->streams[j]->priv_data;
 630         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 631                         oggstream->header_len[0], 0, 1);
 632         oggstream->page.flags |= 2; // bos
 633         ogg_buffer_page(s, oggstream);
 634     }
 635     for (j = 0; j < s->nb_streams; j++) {
 636         AVStream *st = s->streams[j];
 637         oggstream = st->priv_data;
 638         for (i = 1; i < 3; i++) {
 639             if (oggstream->header_len[i])
 640                 ogg_buffer_data(s, st, oggstream->header[i],
 641                                 oggstream->header_len[i], 0, 1);
 642         }
 643         ogg_buffer_page(s, oggstream);
 644     }
 645
 646     oggstream->page.start_granule = AV_NOPTS_VALUE;
 647
 648     ogg_write_pages(s, 2);
 649
 650     return 0;
 651 }
 652
 653 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 654 {
 655     AVStream *st = s->streams[pkt->stream_index];
 656     OGGStreamContext *oggstream = st->priv_data;
 657     int ret;
 658     int64_t granule;
 659
 660     if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 661         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 662         int pframe_count;
 663         if (pkt->flags & AV_PKT_FLAG_KEY)
 664             oggstream->last_kf_pts = pts;
 665         pframe_count = pts - oggstream->last_kf_pts;
 666         // prevent frame count from overflow if key frame flag is not set
 667         if (pframe_count >= (1<<oggstream->kfgshift)) {
 668             oggstream->last_kf_pts += pframe_count;
 669             pframe_count = 0;
 670         }
 671         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 672     } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 673         granule = pkt->pts + pkt->duration +
 674                   av_rescale_q(st->codecpar->initial_padding,
 675                                (AVRational){ 1, st->codecpar->sample_rate },
 676                                st->time_base);
 677     else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 678         int64_t pts, invcnt, dist;
 679         int visible;
 680
 681         visible = (pkt->data[0] >> 4) & 1;
 682         pts     = pkt->pts + pkt->duration;
 683         invcnt  = (oggstream->last_granule >> 30) & 3;
 684         invcnt  = visible ? 3 : (invcnt == 3 ? 0 : invcnt + 1);
 685         dist    = (pkt->flags & AV_PKT_FLAG_KEY) ? 0 : ((oggstream->last_granule >> 3) & 0x07ffffff) + 1;
 686
 687         granule = (pts << 32) | (invcnt << 30) | (dist << 3);
 688     } else
 689         granule = pkt->pts + pkt->duration;
 690
 691     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 692         oggstream->page.start_granule = pkt->pts;
 693
 694     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 695     if (ret < 0)
 696         return ret;
 697
 698     ogg_write_pages(s, 0);
 699
 700     oggstream->last_granule = granule;
 701
 702     return 0;
 703 }
 704
 705 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 706 {
 707     int i;
 708
 709     if (pkt)
 710         return ogg_write_packet_internal(s, pkt);
 711
 712     for (i = 0; i < s->nb_streams; i++) {
 713         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 714         if (oggstream->page.segments_count)
 715             ogg_buffer_page(s, oggstream);
 716     }
 717
 718     ogg_write_pages(s, 2);
 719     return 1;
 720 }
 721
 722 static int ogg_write_trailer(AVFormatContext *s)
 723 {
 724     int i;
 725
 726     /* flush current page if needed */
 727     for (i = 0; i < s->nb_streams; i++) {
 728         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 729
 730         if (oggstream->page.size > 0)
 731             ogg_buffer_page(s, oggstream);
 732     }
 733
 734     ogg_write_pages(s, 1);
 735
 736     return 0;
 737 }
 738
 739 static void ogg_free(AVFormatContext *s)
 740 {
 741     int i;
 742
 743     for (i = 0; i < s->nb_streams; i++) {
 744         AVStream *st = s->streams[i];
 745         OGGStreamContext *oggstream = st->priv_data;
 746         if (!oggstream)
 747             continue;
 748         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
 749             st->codecpar->codec_id == AV_CODEC_ID_SPEEX ||
 750             st->codecpar->codec_id == AV_CODEC_ID_OPUS ||
 751             st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 752             av_freep(&oggstream->header[0]);
 753         }
 754         av_freep(&oggstream->header[1]);
 755         av_freep(&st->priv_data);
 756     }
 757 }
 758
 759 #if CONFIG_OGG_MUXER
 760 OGG_CLASS(ogg, Ogg)
 761 AVOutputFormat ff_ogg_muxer = {
 762     .name              = "ogg",
 763     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
 764     .mime_type         = "application/ogg",
 765     .extensions        = "ogg"
 766 #if !CONFIG_OGV_MUXER
 767                          ",ogv"
 768 #endif
 769 #if !CONFIG_SPX_MUXER
 770                          ",spx"
 771 #endif
 772 #if !CONFIG_OPUS_MUXER
 773                          ",opus"
 774 #endif
 775                          ,
 776     .priv_data_size    = sizeof(OGGContext),
 777     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 778                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 779     .video_codec       = AV_CODEC_ID_THEORA,
 780     .init              = ogg_init,
 781     .write_header      = ogg_write_header,
 782     .write_packet      = ogg_write_packet,
 783     .write_trailer     = ogg_write_trailer,
 784     .deinit            = ogg_free,
 785     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 786     .priv_class        = &ogg_muxer_class,
 787 };
 788 #endif
 789
 790 #if CONFIG_OGA_MUXER
 791 OGG_CLASS(oga, Ogg audio)
 792 AVOutputFormat ff_oga_muxer = {
 793     .name              = "oga",
 794     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Audio"),
 795     .mime_type         = "audio/ogg",
 796     .extensions        = "oga",
 797     .priv_data_size    = sizeof(OGGContext),
 798     .audio_codec       = AV_CODEC_ID_FLAC,
 799     .init              = ogg_init,
 800     .write_header      = ogg_write_header,
 801     .write_packet      = ogg_write_packet,
 802     .write_trailer     = ogg_write_trailer,
 803     .deinit            = ogg_free,
 804     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 805     .priv_class        = &oga_muxer_class,
 806 };
 807 #endif
 808
 809 #if CONFIG_OGV_MUXER
 810 OGG_CLASS(ogv, Ogg video)
 811 AVOutputFormat ff_ogv_muxer = {
 812     .name              = "ogv",
 813     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Video"),
 814     .mime_type         = "video/ogg",
 815     .extensions        = "ogv",
 816     .priv_data_size    = sizeof(OGGContext),
 817     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 818                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 819     .video_codec       = CONFIG_LIBTHEORA_ENCODER ?
 820                          AV_CODEC_ID_THEORA : AV_CODEC_ID_VP8,
 821     .init              = ogg_init,
 822     .write_header      = ogg_write_header,
 823     .write_packet      = ogg_write_packet,
 824     .write_trailer     = ogg_write_trailer,
 825     .deinit            = ogg_free,
 826     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 827     .priv_class        = &ogv_muxer_class,
 828 };
 829 #endif
 830
 831 #if CONFIG_SPX_MUXER
 832 OGG_CLASS(spx, Ogg Speex)
 833 AVOutputFormat ff_spx_muxer = {
 834     .name              = "spx",
 835     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Speex"),
 836     .mime_type         = "audio/ogg",
 837     .extensions        = "spx",
 838     .priv_data_size    = sizeof(OGGContext),
 839     .audio_codec       = AV_CODEC_ID_SPEEX,
 840     .init              = ogg_init,
 841     .write_header      = ogg_write_header,
 842     .write_packet      = ogg_write_packet,
 843     .write_trailer     = ogg_write_trailer,
 844     .deinit            = ogg_free,
 845     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 846     .priv_class        = &spx_muxer_class,
 847 };
 848 #endif
 849
 850 #if CONFIG_OPUS_MUXER
 851 OGG_CLASS(opus, Ogg Opus)
 852 AVOutputFormat ff_opus_muxer = {
 853     .name              = "opus",
 854     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Opus"),
 855     .mime_type         = "audio/ogg",
 856     .extensions        = "opus",
 857     .priv_data_size    = sizeof(OGGContext),
 858     .audio_codec       = AV_CODEC_ID_OPUS,
 859     .init              = ogg_init,
 860     .write_header      = ogg_write_header,
 861     .write_packet      = ogg_write_packet,
 862     .write_trailer     = ogg_write_trailer,
 863     .deinit            = ogg_free,
 864     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 865     .priv_class        = &opus_muxer_class,
 866 };
 867 #endif