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ffmpeg / libavformat / dnxhddec.c @ 2912e87a

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/*
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 * RAW DNxHD (SMPTE VC-3) demuxer
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 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@gmail.com>
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 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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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 "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "rawdec.h"
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static int dnxhd_probe(AVProbeData *p)
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{
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    static const uint8_t header[] = {0x00,0x00,0x02,0x80,0x01};
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    int w, h, compression_id;
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    if (p->buf_size < 0x2c)
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        return 0;
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    if (memcmp(p->buf, header, 5))
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        return 0;
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    h = AV_RB16(p->buf + 0x18);
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    w = AV_RB16(p->buf + 0x1a);
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    if (!w || !h)
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        return 0;
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    compression_id = AV_RB32(p->buf + 0x28);
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    if (compression_id < 1237 || compression_id > 1253)
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        return 0;
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    return AVPROBE_SCORE_MAX;
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}
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AVInputFormat ff_dnxhd_demuxer = {
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    "dnxhd",
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    NULL_IF_CONFIG_SMALL("raw DNxHD (SMPTE VC-3)"),
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    0,
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    dnxhd_probe,
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    ff_raw_video_read_header,
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    ff_raw_read_partial_packet,
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    .flags= AVFMT_GENERIC_INDEX,
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    .value = CODEC_ID_DNXHD,
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};