/*

 * 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"

#include "demux.h"

#include "rawdec.h"

#include "libavutil/intreadwrite.h"

// http://multimedia.cx/ingenient.txt

static int ingenient_probe(const AVProbeData *p)

{

    if (   AV_RN32(p->buf) != AV_RN32("MJPG")

        || p->buf_size < 50

        || AV_RB16(p->buf + 48) != 0xffd8)

        return 0;

    return AVPROBE_SCORE_MAX * 3 / 4;

}

static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)

{

    int ret, size, w, h, unk1, unk2;

    if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G'))

        return AVERROR_INVALIDDATA; // FIXME

    size = avio_rl32(s->pb);

    w = avio_rl16(s->pb);

    h = avio_rl16(s->pb);

    avio_skip(s->pb, 8); // zero + size (padded?)

    avio_skip(s->pb, 2);

    unk1 = avio_rl16(s->pb);

    unk2 = avio_rl16(s->pb);

    avio_skip(s->pb, 22); // ASCII timestamp

    av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",

        size, w, h, unk1, unk2);

    ret = av_get_packet(s->pb, pkt, size);

    if (ret < 0)

        return ret;

    pkt->stream_index = 0;

    return ret;

}

const FFInputFormat ff_ingenient_demuxer = {

    .p.name         = "ingenient",

    .p.long_name    = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"),

    .p.flags        = AVFMT_GENERIC_INDEX,

    .p.extensions   = "cgi", // FIXME

    .p.priv_class   = &ff_rawvideo_demuxer_class,

    .priv_data_size = sizeof(FFRawVideoDemuxerContext),

    .read_probe     = ingenient_probe,

    .read_header    = ff_raw_video_read_header,

    .read_packet    = ingenient_read_packet,

    .raw_codec_id   = AV_CODEC_ID_MJPEG,

};