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  1. /*
  2.  * Copyright (C) 2010 David Conrad
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "libavcodec/bytestream.h"
  22. #include "avformat.h"
  23. #include "internal.h"
  24. #include "oggdec.h"
  25.  
  26. static int skeleton_header(AVFormatContext *s, int idx)
  27. {
  28.     struct ogg *ogg = s->priv_data;
  29.     struct ogg_stream *os = ogg->streams + idx;
  30.     AVStream *st = s->streams[idx];
  31.     uint8_t *buf = os->buf + os->pstart;
  32.     int version_major, version_minor;
  33.     int64_t start_num, start_den;
  34.     uint64_t start_granule;
  35.     int target_idx, start_time;
  36.  
  37.     strcpy(st->codec->codec_name, "skeleton");
  38.     st->codec->codec_type = AVMEDIA_TYPE_DATA;
  39.  
  40.     if ((os->flags & OGG_FLAG_EOS) && os->psize == 0)
  41.         return 1;
  42.  
  43.     if (os->psize < 8)
  44.         return -1;
  45.  
  46.     if (!strncmp(buf, "fishead", 8)) {
  47.         if (os->psize < 64)
  48.             return -1;
  49.  
  50.         version_major = AV_RL16(buf+8);
  51.         version_minor = AV_RL16(buf+10);
  52.  
  53.         if (version_major != 3 && version_major != 4) {
  54.             av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n",
  55.                    version_major, version_minor);
  56.             return -1;
  57.         }
  58.  
  59.         // This is the overall start time. We use it for the start time of
  60.         // of the skeleton stream since if left unset lavf assumes 0,
  61.         // which we don't want since skeleton is timeless
  62.         // FIXME: the real meaning of this field is "start playback at
  63.         // this time which can be in the middle of a packet
  64.         start_num = AV_RL64(buf+12);
  65.         start_den = AV_RL64(buf+20);
  66.  
  67.         if (start_den > 0 && start_num > 0) {
  68.             int base_den;
  69.             av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX);
  70.             avpriv_set_pts_info(st, 64, 1, base_den);
  71.             os->lastpts =
  72.             st->start_time = start_time;
  73.         }
  74.     } else if (!strncmp(buf, "fisbone", 8)) {
  75.         if (os->psize < 52)
  76.             return -1;
  77.  
  78.         target_idx = ogg_find_stream(ogg, AV_RL32(buf+12));
  79.         start_granule = AV_RL64(buf+36);
  80.         if (target_idx < 0) {
  81.             av_log(s, AV_LOG_WARNING, "Serial number in fisbone doesn't match any stream\n");
  82.             return 1;
  83.         }
  84.         os = ogg->streams + target_idx;
  85.         if (os->start_granule != OGG_NOGRANULE_VALUE) {
  86.             av_log(s, AV_LOG_WARNING, "Multiple fisbone for the same stream\n");
  87.             return 1;
  88.         }
  89.         if (start_granule != OGG_NOGRANULE_VALUE) {
  90.             os->start_granule = start_granule;
  91.         }
  92.     }
  93.  
  94.     return 1;
  95. }
  96.  
  97. const struct ogg_codec ff_skeleton_codec = {
  98.     .magic = "fishead",
  99.     .magicsize = 8,
  100.     .header = skeleton_header,
  101.     .nb_header = 0,
  102. };
  103.