2 * Copyright (C) 2010 David Conrad
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavcodec/bytestream.h"
25 static int skeleton_header(AVFormatContext *s, int idx)
27 struct ogg *ogg = s->priv_data;
28 struct ogg_stream *os = ogg->streams + idx;
29 AVStream *st = s->streams[idx];
30 uint8_t *buf = os->buf + os->pstart;
31 int version_major, version_minor;
32 int64_t start_num, start_den, start_granule;
33 int target_idx, start_time;
35 strcpy(st->codec->codec_name, "skeleton");
36 st->codec->codec_type = AVMEDIA_TYPE_DATA;
41 if (!strncmp(buf, "fishead", 8)) {
45 version_major = AV_RL16(buf+8);
46 version_minor = AV_RL16(buf+10);
48 if (version_major != 3) {
49 av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n",
50 version_major, version_minor);
54 // This is the overall start time. We use it for the start time of
55 // of the skeleton stream since if left unset lavf assumes 0,
56 // which we don't want since skeleton is timeless
57 // FIXME: the real meaning of this field is "start playback at
58 // this time which can be in the middle of a packet
59 start_num = AV_RL64(buf+12);
60 start_den = AV_RL64(buf+20);
63 av_reduce(&start_time, &st->time_base.den, start_num, start_den, INT_MAX);
64 st->time_base.num = 1;
66 st->start_time = start_time;
68 } else if (!strncmp(buf, "fisbone", 8)) {
72 target_idx = ogg_find_stream(ogg, AV_RL32(buf+12));
73 start_granule = AV_RL64(buf+36);
74 if (target_idx >= 0 && start_granule != -1) {
75 ogg->streams[target_idx].lastpts =
76 s->streams[target_idx]->start_time = ogg_gptopts(s, target_idx, start_granule, NULL);
83 const struct ogg_codec ff_skeleton_codec = {
86 .header = skeleton_header,