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  1. /*
  2.  * RAW H.264 video demuxer
  3.  * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
  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. #include "libavcodec/internal.h"
  25.  
  26. static int h264_probe(AVProbeData *p)
  27. {
  28.     uint32_t code = -1;
  29.     int sps = 0, pps = 0, idr = 0, res = 0, sli = 0;
  30.     int i;
  31.  
  32.     for (i = 0; i < p->buf_size; i++) {
  33.         code = (code << 8) + p->buf[i];
  34.         if ((code & 0xffffff00) == 0x100) {
  35.             int ref_idc = (code >> 5) & 3;
  36.             int type    = code & 0x1F;
  37.             static const int8_t ref_zero[] = {
  38.                  2,  0,  0,  0,  0, -1,  1, -1,
  39.                 -1,  1,  1,  1,  1, -1,  2,  2,
  40.                  2,  2,  2,  0,  2,  2,  2,  2,
  41.                  2,  2,  2,  2,  2,  2,  2,  2
  42.             };
  43.  
  44.             if (code & 0x80) // forbidden_bit
  45.                 return 0;
  46.  
  47.             if (ref_zero[type] == 1 && ref_idc)
  48.                 return 0;
  49.             if (ref_zero[type] == -1 && !ref_idc)
  50.                 return 0;
  51.             if (ref_zero[type] == 2) {
  52.                 if (!(code == 0x100 && !p->buf[i + 1] && !p->buf[i + 2]))
  53.                     res++;
  54.             }
  55.  
  56.             switch (type) {
  57.             case 1:
  58.                 sli++;
  59.                 break;
  60.             case 5:
  61.                 idr++;
  62.                 break;
  63.             case 7:
  64.                 if (p->buf[i + 2] & 0x03)
  65.                     return 0;
  66.                 sps++;
  67.                 break;
  68.             case 8:
  69.                 pps++;
  70.                 break;
  71.             }
  72.         }
  73.     }
  74.     ff_tlog(NULL, "sps:%d pps:%d idr:%d sli:%d res:%d\n", sps, pps, idr, sli, res);
  75.  
  76.     if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr))
  77.         return AVPROBE_SCORE_EXTENSION + 1;  // 1 more than .mpg
  78.  
  79.     return 0;
  80. }
  81.  
  82. FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264)
  83.