ingenientdec.c 2.1 KB
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/*
 * RAW Ingenient MJPEG demuxer
 * Copyright (c) 2005 Alex Beregszaszi
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avformat.h"
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#include "rawdec.h"
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// http://www.artificis.hu/files/texts/ingenient.txt
static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret, size, w, h, unk1, unk2;

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    if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G'))
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        return AVERROR(EIO); // FIXME

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    size = avio_rl32(s->pb);
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    w = avio_rl16(s->pb);
    h = avio_rl16(s->pb);
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    avio_skip(s->pb, 8); // zero + size (padded?)
    avio_skip(s->pb, 2);
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    unk1 = avio_rl16(s->pb);
    unk2 = avio_rl16(s->pb);
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    avio_skip(s->pb, 22); // ASCII timestamp
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    av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",
        size, w, h, unk1, unk2);

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    ret = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
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        return ret;
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    pkt->stream_index = 0;
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    return ret;
}

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FF_RAWVIDEO_DEMUXER_CLASS(ingenient)

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AVInputFormat ff_ingenient_demuxer = {
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    .name           = "ingenient",
    .long_name      = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),
    .priv_data_size = sizeof(FFRawVideoDemuxerContext),
    .read_header    = ff_raw_video_read_header,
    .read_packet    = ingenient_read_packet,
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    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "cgi", // FIXME
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    .raw_codec_id   = AV_CODEC_ID_MJPEG,
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    .priv_class     = &ingenient_demuxer_class,
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};