third_party_ffmpeg/libavformat/dnxhddec.c

/*
 * RAW DNxHD (SMPTE VC-3) demuxer
 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@gmail.com>
 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
 *
 * 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"
#include "libavcodec/dnxhddata.h"

static int dnxhd_probe(const AVProbeData *p)
{
    int w, h, compression_id;
    if (p->buf_size < 0x2c)
        return 0;
    if (ff_dnxhd_parse_header_prefix(p->buf) == 0)
        return 0;
    h = AV_RB16(p->buf + 0x18);
    w = AV_RB16(p->buf + 0x1a);
    if (!w || !h)
        return 0;
    compression_id = AV_RB32(p->buf + 0x28);
    if ((compression_id < 1235 || compression_id > 1260) &&
        (compression_id < 1270 || compression_id > 1274))
        return 0;
    return AVPROBE_SCORE_MAX;
}

FF_DEF_RAWVIDEO_DEMUXER(dnxhd, "raw DNxHD (SMPTE VC-3)", dnxhd_probe, NULL, AV_CODEC_ID_DNXHD)