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ffmpeg / libavformat / cdg.c @ 56a10009

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1 a3d995c1 Michael Tison
/*
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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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 = avio_size(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 ff_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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};