/*

  * RAW HEVC video demuxer

  * Copyright (c) 2013 Dirk Farin <dirk.farin@gmail.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 "libavcodec/hevc.h"

 #include "avformat.h"
 #include "rawdec.h"
 

 static int hevc_probe(AVProbeData *p)

 {

     uint32_t code = -1;
     int vps = 0, sps = 0, pps = 0, irap = 0;

     int i;
 

     for (i = 0; i < p->buf_size - 1; i++) {
         code = (code << 8) + p->buf[i];

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

             uint8_t nal2 = p->buf[i + 1];
             int type = (code & 0x7E) >> 1;
 
             if (code & 0x81) // forbidden and reserved zero bits
                 return 0;
 
             if (nal2 & 0xf8) // reserved zero
                 return 0;
 
             switch (type) {

             case HEVC_NAL_VPS:        vps++;  break;
             case HEVC_NAL_SPS:        sps++;  break;
             case HEVC_NAL_PPS:        pps++;  break;
             case HEVC_NAL_BLA_N_LP:
             case HEVC_NAL_BLA_W_LP:
             case HEVC_NAL_BLA_W_RADL:
             case HEVC_NAL_CRA_NUT:
             case HEVC_NAL_IDR_N_LP:
             case HEVC_NAL_IDR_W_RADL: irap++; break;

             }

         }
     }
 

     if (vps && sps && pps && irap)

         return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
     return 0;
 }
 

 FF_DEF_RAWVIDEO_DEMUXER(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC)