libavformat/dnxhddec.c

   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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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 < 1237 || 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)