/*
  * RAW MPEG-4 video demuxer
  * Copyright (c) 2006  Thijs Vermeir <thijs.vermeir@barco.com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "avformat.h"

 #include "rawdec.h"

 
 #define VISUAL_OBJECT_START_CODE       0x000001b5
 #define VOP_START_CODE                 0x000001b6
 
 static int mpeg4video_probe(AVProbeData *probe_packet)
 {

     uint32_t temp_buffer = -1;
     int VO = 0, VOL = 0, VOP = 0, VISO = 0, res = 0;

     int i;
 

     for (i = 0; i < probe_packet->buf_size; i++) {
         temp_buffer = (temp_buffer << 8) + probe_packet->buf[i];

         if (temp_buffer & 0xfffffe00)
             continue;
         if (temp_buffer < 2)

             continue;
 

         if (temp_buffer == VOP_START_CODE)
             VOP++;
         else if (temp_buffer == VISUAL_OBJECT_START_CODE)
             VISO++;

         else if (temp_buffer >= 0x100 && temp_buffer < 0x120)

             VO++;

         else if (temp_buffer >= 0x120 && temp_buffer < 0x130)

             VOL++;
         else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) &&
                  !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))
             res++;

     }
 

     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0)

         return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;

 
     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && VOP+VO > 4)
         return AVPROBE_SCORE_EXTENSION/10;

     return 0;
 }
 

 FF_DEF_RAWVIDEO_DEMUXER2(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v",
                          AV_CODEC_ID_MPEG4, AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT)