1/*
2 * CD Graphics Demuxer
3 * Copyright (c) 2009 Michael Tison
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 "avformat.h"
23
24#define CDG_PACKET_SIZE    24
25
26static int read_header(AVFormatContext *s, AVFormatParameters *ap)
27{
28    AVStream *vst;
29    int ret;
30
31    vst = av_new_stream(s, 0);
32    if (!vst)
33        return AVERROR(ENOMEM);
34
35    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
36    vst->codec->codec_id   = CODEC_ID_CDGRAPHICS;
37
38    /// 75 sectors/sec * 4 packets/sector = 300 packets/sec
39    av_set_pts_info(vst, 32, 1, 300);
40
41    ret = url_fsize(s->pb);
42    if (ret > 0)
43        vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
44
45    return 0;
46}
47
48static int read_packet(AVFormatContext *s, AVPacket *pkt)
49{
50    int ret;
51
52    ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
53
54    pkt->stream_index = 0;
55    return ret;
56}
57
58AVInputFormat cdg_demuxer = {
59    "cdg",
60    NULL_IF_CONFIG_SMALL("CD Graphics Format"),
61    0,
62    NULL,
63    read_header,
64    read_packet,
65    .extensions = "cdg"
66};
67