Libav 0.7.1
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00001 /* 00002 * CD Graphics Demuxer 00003 * Copyright (c) 2009 Michael Tison 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avformat.h" 00023 00024 #define CDG_PACKET_SIZE 24 00025 00026 static int read_header(AVFormatContext *s, AVFormatParameters *ap) 00027 { 00028 AVStream *vst; 00029 int ret; 00030 00031 vst = av_new_stream(s, 0); 00032 if (!vst) 00033 return AVERROR(ENOMEM); 00034 00035 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 00036 vst->codec->codec_id = CODEC_ID_CDGRAPHICS; 00037 00039 av_set_pts_info(vst, 32, 1, 300); 00040 00041 ret = avio_size(s->pb); 00042 if (ret > 0) 00043 vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300); 00044 00045 return 0; 00046 } 00047 00048 static int read_packet(AVFormatContext *s, AVPacket *pkt) 00049 { 00050 int ret; 00051 00052 ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE); 00053 00054 pkt->stream_index = 0; 00055 return ret; 00056 } 00057 00058 AVInputFormat ff_cdg_demuxer = { 00059 "cdg", 00060 NULL_IF_CONFIG_SMALL("CD Graphics Format"), 00061 0, 00062 NULL, 00063 read_header, 00064 read_packet, 00065 .extensions = "cdg" 00066 };