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66 lines
1.7 KiB
66 lines
1.7 KiB
/* |
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* CD Graphics Demuxer |
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* Copyright (c) 2009 Michael Tison |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#define CDG_PACKET_SIZE 24 |
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static int read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVStream *vst; |
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int ret; |
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vst = av_new_stream(s, 0); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codec->codec_id = CODEC_ID_CDGRAPHICS; |
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/// 75 sectors/sec * 4 packets/sector = 300 packets/sec |
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av_set_pts_info(vst, 32, 1, 300); |
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ret = url_fsize(s->pb); |
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if (ret > 0) |
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vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300); |
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return 0; |
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} |
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static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret; |
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ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE); |
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pkt->stream_index = 0; |
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return ret; |
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} |
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AVInputFormat cdg_demuxer = { |
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"cdg", |
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NULL_IF_CONFIG_SMALL("CD Graphics Format"), |
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0, |
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NULL, |
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read_header, |
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read_packet, |
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.extensions = "cdg" |
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};
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