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
 137     size = avio_close_dyn_buf(pb, &buf);
 138     if (size < 0)
 139         return size;
 140
 141     avio_write(s->pb, buf, size);
 142     avio_flush(s->pb);
 143     av_free(buf);
 144     oggstream->page_count--;
 145     return 0;
 146 }
 147
 148 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
 149 {
 150     return (oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1))) ||
 151            (oggstream->isvp8    && !((granule >> 3) & 0x07ffffff));
 152 }
 153
 154 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
 155 {
 156     if (oggstream->kfgshift)
 157         return (granule>>oggstream->kfgshift) +
 158             (granule & ((1<<oggstream->kfgshift)-1));
 159     else if (oggstream->isvp8)
 160         return granule >> 32;
 161     else
 162         return granule;
 163 }
 164
 165 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
 166 {
 167     AVStream *st2 = s->streams[next->stream_index];
 168     AVStream *st  = s->streams[page->stream_index];
 169     int64_t next_granule, cur_granule;
 170
 171     if (next->granule == -1 || page->granule == -1)
 172         return 0;
 173
 174     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
 175                                 st2->time_base, AV_TIME_BASE_Q);
 176     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
 177                                 st ->time_base, AV_TIME_BASE_Q);
 178     return next_granule > cur_granule;
 179 }
 180
 181 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
 182 {
 183     oggstream->page.granule = -1;
 184     oggstream->page.flags = 0;
 185     oggstream->page.segments_count = 0;
 186     oggstream->page.size = 0;
 187     return 0;
 188 }
 189
 190 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
 191 {
 192     OGGContext *ogg = s->priv_data;
 193     OGGPageList **p = &ogg->page_list;
 194     OGGPageList *l = av_mallocz(sizeof(*l));
 195
 196     if (!l)
 197         return AVERROR(ENOMEM);
 198     l->page = oggstream->page;
 199
 200     oggstream->page.start_granule = ogg_granule_to_timestamp(oggstream, oggstream->page.granule);
 201     oggstream->page_count++;
 202     ogg_reset_cur_page(oggstream);
 203
 204     while (*p) {
 205         if (ogg_compare_granule(s, &(*p)->page, &l->page))
 206             break;
 207         p = &(*p)->next;
 208     }
 209     l->next = *p;
 210     *p = l;
 211
 212     return 0;
 213 }
 214
 215 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
 216                            uint8_t *data, unsigned size, int64_t granule,
 217                            int header)
 218 {
 219     OGGStreamContext *oggstream = st->priv_data;
 220     OGGContext *ogg = s->priv_data;
 221     int total_segments = size / 255 + 1;
 222     uint8_t *p = data;
 223     int i, segments, len, flush = 0;
 224
 225     // Handles VFR by flushing page because this frame needs to have a timestamp
 226     // For theora and VP8, keyframes also need to have a timestamp to correctly mark
 227     // them as such, otherwise seeking will not work correctly at the very
 228     // least with old libogg versions.
 229     // Do not try to flush header packets though, that will create broken files.
 230     if ((st->codecpar->codec_id == AV_CODEC_ID_THEORA || st->codecpar->codec_id == AV_CODEC_ID_VP8) && !header &&
 231         (ogg_granule_to_timestamp(oggstream, granule) >
 232          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
 233          ogg_key_granule(oggstream, granule))) {
 234         if (oggstream->page.granule != -1)
 235             ogg_buffer_page(s, oggstream);
 236         flush = 1;
 237     }
 238
 239     // avoid a continued page
 240     if (!header && oggstream->page.size > 0 &&
 241         MAX_PAGE_SIZE - oggstream->page.size < size) {
 242         ogg_buffer_page(s, oggstream);
 243     }
 244
 245     for (i = 0; i < total_segments; ) {
 246         OGGPage *page = &oggstream->page;
 247
 248         segments = FFMIN(total_segments - i, 255 - page->segments_count);
 249
 250         if (i && !page->segments_count)
 251             page->flags |= 1; // continued packet
 252
 253         memset(page->segments+page->segments_count, 255, segments - 1);
 254         page->segments_count += segments - 1;
 255
 256         len = FFMIN(size, segments*255);
 257         page->segments[page->segments_count++] = len - (segments-1)*255;
 258         memcpy(page->data+page->size, p, len);
 259         p += len;
 260         size -= len;
 261         i += segments;
 262         page->size += len;
 263
 264         if (i == total_segments)
 265             page->granule = granule;
 266
 267         {
 268             AVStream *st = s->streams[page->stream_index];
 269
 270             int64_t start = av_rescale_q(page->start_granule, st->time_base,
 271                                          AV_TIME_BASE_Q);
 272             int64_t next  = av_rescale_q(ogg_granule_to_timestamp(oggstream, page->granule),
 273                                          st->time_base, AV_TIME_BASE_Q);
 274
 275             if (page->segments_count == 255) {
 276                 ogg_buffer_page(s, oggstream);
 277             } else if (!header) {
 278                 if ((ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
 279                     (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
 280                     ogg_buffer_page(s, oggstream);
 281                 }
 282             }
 283         }
 284     }
 285
 286     if (flush && oggstream->page.granule != -1)
 287         ogg_buffer_page(s, oggstream);
 288
 289     return 0;
 290 }
 291
 292 static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
 293                                         int *header_len, AVDictionary **m, int framing_bit,
 294                                         AVChapter **chapters, unsigned int nb_chapters)
 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, chapters, nb_chapters) + 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, chapters, nb_chapters);
 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, NULL, 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, NULL, 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, AVChapter **chapters,
 389                                   unsigned int nb_chapters)
 390 {
 391     uint8_t *p;
 392
 393     if (par->extradata_size < OPUS_HEADER_SIZE)
 394         return AVERROR_INVALIDDATA;
 395
 396     /* first packet: Opus header */
 397     p = av_mallocz(par->extradata_size);
 398     if (!p)
 399         return AVERROR(ENOMEM);
 400     oggstream->header[0] = p;
 401     oggstream->header_len[0] = par->extradata_size;
 402     bytestream_put_buffer(&p, par->extradata, par->extradata_size);
 403
 404     /* second packet: VorbisComment */
 405     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0, chapters, nb_chapters);
 406     if (!p)
 407         return AVERROR(ENOMEM);
 408     oggstream->header[1] = p;
 409     bytestream_put_buffer(&p, "OpusTags", 8);
 410
 411     return 0;
 412 }
 413
 414 #define VP8_HEADER_SIZE 26
 415
 416 static int ogg_build_vp8_headers(AVFormatContext *s, AVStream *st,
 417                                  OGGStreamContext *oggstream, int bitexact)
 418 {
 419     AVCodecParameters *par = st->codecpar;
 420     uint8_t *p;
 421
 422     /* first packet: VP8 header */
 423     p = av_mallocz(VP8_HEADER_SIZE);
 424     if (!p)
 425         return AVERROR(ENOMEM);
 426     oggstream->header[0] = p;
 427     oggstream->header_len[0] = VP8_HEADER_SIZE;
 428     bytestream_put_byte(&p, 0x4f); // HDRID
 429     bytestream_put_buffer(&p, "VP80", 4); // Identifier
 430     bytestream_put_byte(&p, 1); // HDRTYP
 431     bytestream_put_byte(&p, 1); // VMAJ
 432     bytestream_put_byte(&p, 0); // VMIN
 433     bytestream_put_be16(&p, par->width);
 434     bytestream_put_be16(&p, par->height);
 435     bytestream_put_be24(&p, par->sample_aspect_ratio.num);
 436     bytestream_put_be24(&p, par->sample_aspect_ratio.den);
 437     if (st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0) {
 438         // OggVP8 requires pts to increase by 1 per visible frame, so use the least common
 439         // multiple framerate if available.
 440         av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 441                st->time_base.num, st->time_base.den,
 442                st->r_frame_rate.den, st->r_frame_rate.num);
 443         avpriv_set_pts_info(st, 64, st->r_frame_rate.den, st->r_frame_rate.num);
 444     }
 445     bytestream_put_be32(&p, st->time_base.den);
 446     bytestream_put_be32(&p, st->time_base.num);
 447
 448     /* optional second packet: VorbisComment */
 449     if (av_dict_get(st->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
 450         p = ogg_write_vorbiscomment(7, bitexact, &oggstream->header_len[1], &st->metadata, 0, NULL, 0);
 451         if (!p)
 452             return AVERROR(ENOMEM);
 453         oggstream->header[1] = p;
 454         bytestream_put_byte(&p, 0x4f); // HDRID
 455         bytestream_put_buffer(&p, "VP80", 4); // Identifier
 456         bytestream_put_byte(&p, 2); // HDRTYP
 457         bytestream_put_byte(&p, 0x20);
 458     }
 459
 460     oggstream->isvp8 = 1;
 461
 462     return 0;
 463 }
 464
 465 static void ogg_write_pages(AVFormatContext *s, int flush)
 466 {
 467     OGGContext *ogg = s->priv_data;
 468     OGGPageList *next, *p;
 469
 470     if (!ogg->page_list)
 471         return;
 472
 473     for (p = ogg->page_list; p; ) {
 474         OGGStreamContext *oggstream =
 475             s->streams[p->page.stream_index]->priv_data;
 476         if (oggstream->page_count < 2 && !flush)
 477             break;
 478         ogg_write_page(s, &p->page,
 479                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
 480         next = p->next;
 481         av_freep(&p);
 482         p = next;
 483     }
 484     ogg->page_list = p;
 485 }
 486
 487 static int ogg_init(AVFormatContext *s)
 488 {
 489     OGGContext *ogg = s->priv_data;
 490     OGGStreamContext *oggstream = NULL;
 491     int i, j;
 492
 493     if (ogg->pref_size)
 494         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
 495
 496     for (i = 0; i < s->nb_streams; i++) {
 497         AVStream *st = s->streams[i];
 498         unsigned serial_num = i + ogg->serial_offset;
 499
 500         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 501             if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 502                 /* Opus requires a fixed 48kHz clock */
 503                 avpriv_set_pts_info(st, 64, 1, 48000);
 504             else
 505                 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 506         }
 507
 508         if (st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
 509             st->codecpar->codec_id != AV_CODEC_ID_THEORA &&
 510             st->codecpar->codec_id != AV_CODEC_ID_SPEEX  &&
 511             st->codecpar->codec_id != AV_CODEC_ID_FLAC   &&
 512             st->codecpar->codec_id != AV_CODEC_ID_OPUS   &&
 513             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 514             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
 515             return AVERROR(EINVAL);
 516         }
 517
 518         if ((!st->codecpar->extradata || !st->codecpar->extradata_size) &&
 519             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
 520             av_log(s, AV_LOG_ERROR, "No extradata present\n");
 521             return AVERROR_INVALIDDATA;
 522         }
 523         oggstream = av_mallocz(sizeof(*oggstream));
 524         if (!oggstream)
 525             return AVERROR(ENOMEM);
 526
 527         oggstream->page.stream_index = i;
 528
 529         if (!(s->flags & AVFMT_FLAG_BITEXACT))
 530             do {
 531                 serial_num = av_get_random_seed();
 532                 for (j = 0; j < i; j++) {
 533                     OGGStreamContext *sc = s->streams[j]->priv_data;
 534                     if (serial_num == sc->serial_num)
 535                         break;
 536                 }
 537             } while (j < i);
 538         oggstream->serial_num = serial_num;
 539
 540         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
 541
 542         st->priv_data = oggstream;
 543         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
 544             int err = ogg_build_flac_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 FLAC headers\n");
 549                 av_freep(&st->priv_data);
 550                 return err;
 551             }
 552         } else if (st->codecpar->codec_id == AV_CODEC_ID_SPEEX) {
 553             int err = ogg_build_speex_headers(st->codecpar, oggstream,
 554                                               s->flags & AVFMT_FLAG_BITEXACT,
 555                                               &st->metadata);
 556             if (err) {
 557                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
 558                 av_freep(&st->priv_data);
 559                 return err;
 560             }
 561         } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
 562             int err = ogg_build_opus_headers(st->codecpar, oggstream,
 563                                              s->flags & AVFMT_FLAG_BITEXACT,
 564                                              &st->metadata, s->chapters, s->nb_chapters);
 565             if (err) {
 566                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
 567                 av_freep(&st->priv_data);
 568                 return err;
 569             }
 570         } else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 571             int err = ogg_build_vp8_headers(s, st, oggstream,
 572                                             s->flags & AVFMT_FLAG_BITEXACT);
 573             if (err) {
 574                 av_log(s, AV_LOG_ERROR, "Error writing VP8 headers\n");
 575                 av_freep(&st->priv_data);
 576                 return err;
 577             }
 578         } else {
 579             uint8_t *p;
 580             const char *cstr = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
 581             int header_type = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
 582             int framing_bit = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
 583
 584             if (avpriv_split_xiph_headers(st->codecpar->extradata, st->codecpar->extradata_size,
 585                                       st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
 586                                       (const uint8_t**)oggstream->header, oggstream->header_len) < 0) {
 587                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
 588                 av_freep(&st->priv_data);
 589                 return AVERROR_INVALIDDATA;
 590             }
 591
 592             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
 593                                         &oggstream->header_len[1], &st->metadata,
 594                                         framing_bit, NULL, 0);
 595             oggstream->header[1] = p;
 596             if (!p)
 597                 return AVERROR(ENOMEM);
 598
 599             bytestream_put_byte(&p, header_type);
 600             bytestream_put_buffer(&p, cstr, 6);
 601
 602             if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 603                 int den = AV_RB32(oggstream->header[0] + 22), num = AV_RB32(oggstream->header[0] + 26);
 604                 /* Make sure to use time base stored in the Theora stream header to write
 605                    correct timestamps */
 606                 if (st->time_base.num != num || st->time_base.den != den) {
 607                     av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
 608                            st->time_base.num, st->time_base.den, num, den);
 609                     avpriv_set_pts_info(st, 64, num, den);
 610                 }
 611                 /** KFGSHIFT is the width of the less significant section of the granule position
 612                     The less significant section is the frame count since the last keyframe */
 613                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
 614                 oggstream->vrev = oggstream->header[0][9];
 615                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
 616                        oggstream->kfgshift, oggstream->vrev);
 617             }
 618         }
 619     }
 620
 621     return 0;
 622 }
 623
 624 static int ogg_write_header(AVFormatContext *s)
 625 {
 626     OGGStreamContext *oggstream = NULL;
 627     int i, j;
 628
 629     for (j = 0; j < s->nb_streams; j++) {
 630         oggstream = s->streams[j]->priv_data;
 631         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
 632                         oggstream->header_len[0], 0, 1);
 633         oggstream->page.flags |= 2; // bos
 634         ogg_buffer_page(s, oggstream);
 635     }
 636     for (j = 0; j < s->nb_streams; j++) {
 637         AVStream *st = s->streams[j];
 638         oggstream = st->priv_data;
 639         for (i = 1; i < 3; i++) {
 640             if (oggstream->header_len[i])
 641                 ogg_buffer_data(s, st, oggstream->header[i],
 642                                 oggstream->header_len[i], 0, 1);
 643         }
 644         ogg_buffer_page(s, oggstream);
 645     }
 646
 647     oggstream->page.start_granule = AV_NOPTS_VALUE;
 648
 649     ogg_write_pages(s, 2);
 650
 651     return 0;
 652 }
 653
 654 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 655 {
 656     AVStream *st = s->streams[pkt->stream_index];
 657     OGGStreamContext *oggstream = st->priv_data;
 658     int ret;
 659     int64_t granule;
 660
 661     if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
 662         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
 663         int pframe_count;
 664         if (pkt->flags & AV_PKT_FLAG_KEY)
 665             oggstream->last_kf_pts = pts;
 666         pframe_count = pts - oggstream->last_kf_pts;
 667         // prevent frame count from overflow if key frame flag is not set
 668         if (pframe_count >= (1<<oggstream->kfgshift)) {
 669             oggstream->last_kf_pts += pframe_count;
 670             pframe_count = 0;
 671         }
 672         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
 673     } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
 674         granule = pkt->pts + pkt->duration +
 675                   av_rescale_q(st->codecpar->initial_padding,
 676                                (AVRational){ 1, st->codecpar->sample_rate },
 677                                st->time_base);
 678     else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 679         int64_t pts, invcnt, dist;
 680         int visible;
 681
 682         visible = (pkt->data[0] >> 4) & 1;
 683         pts     = pkt->pts + pkt->duration;
 684         invcnt  = (oggstream->last_granule >> 30) & 3;
 685         invcnt  = visible ? 3 : (invcnt == 3 ? 0 : invcnt + 1);
 686         dist    = (pkt->flags & AV_PKT_FLAG_KEY) ? 0 : ((oggstream->last_granule >> 3) & 0x07ffffff) + 1;
 687
 688         granule = (pts << 32) | (invcnt << 30) | (dist << 3);
 689     } else
 690         granule = pkt->pts + pkt->duration;
 691
 692     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
 693         oggstream->page.start_granule = pkt->pts;
 694
 695     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
 696     if (ret < 0)
 697         return ret;
 698
 699     ogg_write_pages(s, 0);
 700
 701     oggstream->last_granule = granule;
 702
 703     return 0;
 704 }
 705
 706 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
 707 {
 708     int i;
 709
 710     if (pkt)
 711         return ogg_write_packet_internal(s, pkt);
 712
 713     for (i = 0; i < s->nb_streams; i++) {
 714         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 715         if (oggstream->page.segments_count)
 716             ogg_buffer_page(s, oggstream);
 717     }
 718
 719     ogg_write_pages(s, 2);
 720     return 1;
 721 }
 722
 723 static int ogg_write_trailer(AVFormatContext *s)
 724 {
 725     int i;
 726
 727     /* flush current page if needed */
 728     for (i = 0; i < s->nb_streams; i++) {
 729         OGGStreamContext *oggstream = s->streams[i]->priv_data;
 730
 731         if (oggstream->page.size > 0)
 732             ogg_buffer_page(s, oggstream);
 733     }
 734
 735     ogg_write_pages(s, 1);
 736
 737     return 0;
 738 }
 739
 740 static void ogg_free(AVFormatContext *s)
 741 {
 742     OGGContext *ogg = s->priv_data;
 743     OGGPageList *p = ogg->page_list;
 744     int i;
 745
 746     for (i = 0; i < s->nb_streams; i++) {
 747         AVStream *st = s->streams[i];
 748         OGGStreamContext *oggstream = st->priv_data;
 749         if (!oggstream)
 750             continue;
 751         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
 752             st->codecpar->codec_id == AV_CODEC_ID_SPEEX ||
 753             st->codecpar->codec_id == AV_CODEC_ID_OPUS ||
 754             st->codecpar->codec_id == AV_CODEC_ID_VP8) {
 755             av_freep(&oggstream->header[0]);
 756         }
 757         av_freep(&oggstream->header[1]);
 758         av_freep(&st->priv_data);
 759     }
 760
 761     while (p) {
 762         OGGPageList *next = p->next;
 763         av_free(p);
 764         p = next;
 765     }
 766     ogg->page_list = NULL;
 767 }
 768
 769 #if CONFIG_OGG_MUXER
 770 OGG_CLASS(ogg, Ogg)
 771 AVOutputFormat ff_ogg_muxer = {
 772     .name              = "ogg",
 773     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
 774     .mime_type         = "application/ogg",
 775     .extensions        = "ogg"
 776 #if !CONFIG_OGV_MUXER
 777                          ",ogv"
 778 #endif
 779 #if !CONFIG_SPX_MUXER
 780                          ",spx"
 781 #endif
 782 #if !CONFIG_OPUS_MUXER
 783                          ",opus"
 784 #endif
 785                          ,
 786     .priv_data_size    = sizeof(OGGContext),
 787     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 788                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 789     .video_codec       = AV_CODEC_ID_THEORA,
 790     .init              = ogg_init,
 791     .write_header      = ogg_write_header,
 792     .write_packet      = ogg_write_packet,
 793     .write_trailer     = ogg_write_trailer,
 794     .deinit            = ogg_free,
 795     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 796     .priv_class        = &ogg_muxer_class,
 797 };
 798 #endif
 799
 800 #if CONFIG_OGA_MUXER
 801 OGG_CLASS(oga, Ogg audio)
 802 AVOutputFormat ff_oga_muxer = {
 803     .name              = "oga",
 804     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Audio"),
 805     .mime_type         = "audio/ogg",
 806     .extensions        = "oga",
 807     .priv_data_size    = sizeof(OGGContext),
 808     .audio_codec       = AV_CODEC_ID_FLAC,
 809     .init              = ogg_init,
 810     .write_header      = ogg_write_header,
 811     .write_packet      = ogg_write_packet,
 812     .write_trailer     = ogg_write_trailer,
 813     .deinit            = ogg_free,
 814     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 815     .priv_class        = &oga_muxer_class,
 816 };
 817 #endif
 818
 819 #if CONFIG_OGV_MUXER
 820 OGG_CLASS(ogv, Ogg video)
 821 AVOutputFormat ff_ogv_muxer = {
 822     .name              = "ogv",
 823     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Video"),
 824     .mime_type         = "video/ogg",
 825     .extensions        = "ogv",
 826     .priv_data_size    = sizeof(OGGContext),
 827     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
 828                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
 829     .video_codec       = CONFIG_LIBTHEORA_ENCODER ?
 830                          AV_CODEC_ID_THEORA : AV_CODEC_ID_VP8,
 831     .init              = ogg_init,
 832     .write_header      = ogg_write_header,
 833     .write_packet      = ogg_write_packet,
 834     .write_trailer     = ogg_write_trailer,
 835     .deinit            = ogg_free,
 836     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
 837     .priv_class        = &ogv_muxer_class,
 838 };
 839 #endif
 840
 841 #if CONFIG_SPX_MUXER
 842 OGG_CLASS(spx, Ogg Speex)
 843 AVOutputFormat ff_spx_muxer = {
 844     .name              = "spx",
 845     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Speex"),
 846     .mime_type         = "audio/ogg",
 847     .extensions        = "spx",
 848     .priv_data_size    = sizeof(OGGContext),
 849     .audio_codec       = AV_CODEC_ID_SPEEX,
 850     .init              = ogg_init,
 851     .write_header      = ogg_write_header,
 852     .write_packet      = ogg_write_packet,
 853     .write_trailer     = ogg_write_trailer,
 854     .deinit            = ogg_free,
 855     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 856     .priv_class        = &spx_muxer_class,
 857 };
 858 #endif
 859
 860 #if CONFIG_OPUS_MUXER
 861 OGG_CLASS(opus, Ogg Opus)
 862 AVOutputFormat ff_opus_muxer = {
 863     .name              = "opus",
 864     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Opus"),
 865     .mime_type         = "audio/ogg",
 866     .extensions        = "opus",
 867     .priv_data_size    = sizeof(OGGContext),
 868     .audio_codec       = AV_CODEC_ID_OPUS,
 869     .init              = ogg_init,
 870     .write_header      = ogg_write_header,
 871     .write_packet      = ogg_write_packet,
 872     .write_trailer     = ogg_write_trailer,
 873     .deinit            = ogg_free,
 874     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
 875     .priv_class        = &opus_muxer_class,
 876 };
 877 #endif