text: /*
   * 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)
  