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  1. /*
  2.  * RAW HEVC video demuxer
  3.  * Copyright (c) 2013 Dirk Farin <dirk.farin@gmail.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. #include "libavcodec/hevc.h"
  26.  
  27. static int hevc_probe(AVProbeData *p)
  28. {
  29.     uint32_t code = -1;
  30.     int vps = 0, sps = 0, pps = 0, irap = 0;
  31.     int i;
  32.  
  33.     for (i = 0; i < p->buf_size - 1; i++) {
  34.         code = (code << 8) + p->buf[i];
  35.         if ((code & 0xffffff00) == 0x100) {
  36.             uint8_t nal2 = p->buf[i + 1];
  37.             int type = (code & 0x7E) >> 1;
  38.  
  39.             if (code & 0x81) // forbidden and reserved zero bits
  40.                 return 0;
  41.  
  42.             if (nal2 & 0xf8) // reserved zero
  43.                 return 0;
  44.  
  45.             switch (type) {
  46.             case NAL_VPS:        vps++;  break;
  47.             case NAL_SPS:        sps++;  break;
  48.             case NAL_PPS:        pps++;  break;
  49.             case NAL_BLA_N_LP:
  50.             case NAL_BLA_W_LP:
  51.             case NAL_BLA_W_RADL:
  52.             case NAL_CRA_NUT:
  53.             case NAL_IDR_N_LP:
  54.             case NAL_IDR_W_RADL: irap++; break;
  55.             }
  56.         }
  57.     }
  58.  
  59.     // printf("vps=%d, sps=%d, pps=%d, irap=%d\n", vps, sps, pps, irap);
  60.  
  61.     if (vps && sps && pps && irap)
  62.         return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
  63.     return 0;
  64. }
  65.  
  66. FF_DEF_RAWVIDEO_DEMUXER(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC)
  67.