/*
  * Copyright (C) 2010 David Conrad
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavcodec/bytestream.h"
 #include "avformat.h"
 #include "oggdec.h"
 
 static int skeleton_header(AVFormatContext *s, int idx)
 {
     struct ogg *ogg = s->priv_data;
     struct ogg_stream *os = ogg->streams + idx;
     AVStream *st = s->streams[idx];
     uint8_t *buf = os->buf + os->pstart;
     int version_major, version_minor;
     int64_t start_num, start_den, start_granule;
     int target_idx, start_time;
 
     strcpy(st->codec->codec_name, "skeleton");

     st->codec->codec_type = AVMEDIA_TYPE_DATA;

 
     if (os->psize < 8)
         return -1;
 
     if (!strncmp(buf, "fishead", 8)) {
         if (os->psize < 64)
             return -1;
 
         version_major = AV_RL16(buf+8);
         version_minor = AV_RL16(buf+10);
 
         if (version_major != 3) {
             av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n",
                    version_major, version_minor);
             return -1;
         }
 
         // This is the overall start time. We use it for the start time of
         // of the skeleton stream since if left unset lavf assumes 0,
         // which we don't want since skeleton is timeless
         // FIXME: the real meaning of this field is "start playback at
         // this time which can be in the middle of a packet
         start_num = AV_RL64(buf+12);
         start_den = AV_RL64(buf+20);
 
         if (start_den) {

             int base_den;

             av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX);
             av_set_pts_info(st, 64, 1, base_den);

             os->lastpts =

             st->start_time = start_time;
         }
     } else if (!strncmp(buf, "fisbone", 8)) {
         if (os->psize < 52)
             return -1;
 
         target_idx = ogg_find_stream(ogg, AV_RL32(buf+12));
         start_granule = AV_RL64(buf+36);
         if (target_idx >= 0 && start_granule != -1) {

             ogg->streams[target_idx].lastpts =

             s->streams[target_idx]->start_time = ogg_gptopts(s, target_idx, start_granule, NULL);
         }
     }
 
     return 1;
 }
 
 const struct ogg_codec ff_skeleton_codec = {
     .magic = "fishead",
     .magicsize = 8,
     .header = skeleton_header,
 };