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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 & 0xfffffe00)
  37.             continue;
  38.         if (temp_buffer < 2)
  39.             continue;
  40.  
  41.         if (temp_buffer == VOP_START_CODE)
  42.             VOP++;
  43.         else if (temp_buffer == VISUAL_OBJECT_START_CODE)
  44.             VISO++;
  45.         else if (temp_buffer >= 0x100 && temp_buffer < 0x120)
  46.             VO++;
  47.         else if (temp_buffer >= 0x120 && temp_buffer < 0x130)
  48.             VOL++;
  49.         else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) &&
  50.                  !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))
  51.             res++;
  52.     }
  53.  
  54.     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0)
  55.         return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
  56.     return 0;
  57. }
  58.  
  59. FF_DEF_RAWVIDEO_DEMUXER2(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v",
  60.                          AV_CODEC_ID_MPEG4, AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT)
  61.