/*

 * MJPEG 2000 Demuxer

 * Copyright (c) 2016 Ståle Kristoffersen

 *

 * 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 "libavutil/intreadwrite.h"

#include "avformat.h"

#include "rawdec.h"

static int mjpeg2000_probe(const AVProbeData *p)

{

    const uint8_t *b = p->buf;

    int i, marker, marker_size;

    int frames = 0, invalid = 0;

    for (i = 0; i < p->buf_size - 5; i++) {

        if (AV_RB32(b) == 0xff4fff51){

            marker_size = AV_RB16(b+4);

            if (marker_size + i < p->buf_size - 4) {

                marker = AV_RB8(b+4+marker_size);

                if (marker == 0xff)

                    frames++;

                else

                    invalid++;

            }

        }

        b += 1;

    }

    if (invalid*4 + 1 < frames) {

        if (invalid == 0 && frames > 2)

            return AVPROBE_SCORE_EXTENSION / 2;

        return AVPROBE_SCORE_EXTENSION / 4;

    }

    return 0;

}

FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)