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  1. /*
  2.  * RAW MPEG-4 video demuxer
  3.  * Copyright (c) 2006  Thijs Vermeir <thijs.vermeir@barco.com>
  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 "avformat.h"
  23. #include "rawdec.h"
  24.  
  25. #define VISUAL_OBJECT_START_CODE       0x000001b5
  26. #define VOP_START_CODE                 0x000001b6
  27.  
  28. static int mpeg4video_probe(AVProbeData *probe_packet)
  29. {
  30.     uint32_t temp_buffer= -1;
  31.     int VO=0, VOL=0, VOP = 0, VISO = 0, res=0;
  32.     int i;
  33.  
  34.     for(i=0; i<probe_packet->buf_size; i++){
  35.         temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];
  36.         if ((temp_buffer & 0xffffff00) != 0x100)
  37.             continue;
  38.  
  39.         if (temp_buffer == VOP_START_CODE)                         VOP++;
  40.         else if (temp_buffer == VISUAL_OBJECT_START_CODE)          VISO++;
  41.         else if (temp_buffer < 0x120)                              VO++;
  42.         else if (temp_buffer < 0x130)                              VOL++;
  43.         else if (   !(0x1AF < temp_buffer && temp_buffer < 0x1B7)
  44.                  && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;
  45.     }
  46.  
  47.     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
  48.         return VOP+VO > 3 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
  49.     return 0;
  50. }
  51.  
  52. FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", AV_CODEC_ID_MPEG4)
  53.