/*
  * RAW H.264 video demuxer
  * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
  *
  * 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"

 #include "libavcodec/internal.h"

 
 static int h264_probe(AVProbeData *p)
 {

     uint32_t code = -1;
     int sps = 0, pps = 0, idr = 0, res = 0, sli = 0;

     int i;
 

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

         if ((code & 0xffffff00) == 0x100) {

             int ref_idc = (code >> 5) & 3;
             int type    = code & 0x1F;
             static const int8_t ref_zero[] = {
                  2,  0,  0,  0,  0, -1,  1, -1,
                 -1,  1,  1,  1,  1, -1,  2,  2,
                  2,  2,  2,  0,  2,  2,  2,  2,
                  2,  2,  2,  2,  2,  2,  2,  2

             };
 

             if (code & 0x80) // forbidden_bit

                 return 0;
 

             if (ref_zero[type] == 1 && ref_idc)

                 return 0;

             if (ref_zero[type] == -1 && !ref_idc)

                 return 0;

             if (ref_zero[type] == 2) {
                 if (!(code == 0x100 && !p->buf[i + 1] && !p->buf[i + 2]))
                     res++;
             }

             switch (type) {
             case 1:
                 sli++;
                 break;
             case 5:
                 idr++;
                 break;
             case 7:

                 if (p->buf[i + 2] & 0x03)

                     return 0;
                 sps++;
                 break;

             case 8:
                 pps++;
                 break;

             }
         }
     }

     ff_tlog(NULL, "sps:%d pps:%d idr:%d sli:%d res:%d\n", sps, pps, idr, sli, res);

 
     if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr))
         return AVPROBE_SCORE_EXTENSION + 1;  // 1 more than .mpg
 

     return 0;
 }
 

 FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264)