3 * Copyright (c) 2009 Michael Tison
5 * This file is part of FFmpeg.
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.
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.
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
24 #define CDG_PACKET_SIZE 24
26 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
31 vst = av_new_stream(s, 0);
33 return AVERROR(ENOMEM);
35 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
36 vst->codec->codec_id = CODEC_ID_CDGRAPHICS;
38 /// 75 sectors/sec * 4 packets/sector = 300 packets/sec
39 av_set_pts_info(vst, 32, 1, 300);
41 ret = url_fsize(s->pb);
43 vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
48 static int read_packet(AVFormatContext *s, AVPacket *pkt)
52 ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
54 pkt->stream_index = 0;
58 AVInputFormat cdg_demuxer = {
60 NULL_IF_CONFIG_SMALL("CD Graphics Format"),