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  1. /*
  2.  * RAW DNxHD (SMPTE VC-3) demuxer
  3.  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@gmail.com>
  4.  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "libavutil/intreadwrite.h"
  24. #include "avformat.h"
  25. #include "rawdec.h"
  26.  
  27. static int dnxhd_probe(AVProbeData *p)
  28. {
  29.     static const uint8_t header[] = {0x00,0x00,0x02,0x80,0x01};
  30.     int w, h, compression_id;
  31.     if (p->buf_size < 0x2c)
  32.         return 0;
  33.     if (memcmp(p->buf, header, 5))
  34.         return 0;
  35.     h = AV_RB16(p->buf + 0x18);
  36.     w = AV_RB16(p->buf + 0x1a);
  37.     if (!w || !h)
  38.         return 0;
  39.     compression_id = AV_RB32(p->buf + 0x28);
  40.     if (compression_id < 1235 || compression_id > 1253)
  41.         return 0;
  42.     return AVPROBE_SCORE_MAX;
  43. }
  44.  
  45. FF_DEF_RAWVIDEO_DEMUXER(dnxhd, "raw DNxHD (SMPTE VC-3)", dnxhd_probe, NULL, AV_CODEC_ID_DNXHD)
  46.