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  1. /*
  2.  * RAW Dirac demuxer
  3.  * Copyright (c) 2007 Marco Gerards <marco@gnu.org>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/intreadwrite.h"
  23. #include "avformat.h"
  24. #include "rawdec.h"
  25.  
  26. static int dirac_probe(AVProbeData *p)
  27. {
  28.     unsigned size;
  29.     if (AV_RL32(p->buf) != MKTAG('B', 'B', 'C', 'D'))
  30.         return 0;
  31.  
  32.     size = AV_RB32(p->buf+5);
  33.     if (size < 13)
  34.         return 0;
  35.     if (size + 13LL > p->buf_size)
  36.         return AVPROBE_SCORE_MAX / 4;
  37.     if (AV_RL32(p->buf + size) != MKTAG('B', 'B', 'C', 'D'))
  38.         return 0;
  39.  
  40.     return AVPROBE_SCORE_MAX;
  41. }
  42.  
  43. FF_DEF_RAWVIDEO_DEMUXER(dirac, "raw Dirac", dirac_probe, NULL, AV_CODEC_ID_DIRAC)
  44.