text: #ifndef NAL_H_
  #define NAL_H_
  /*****************************************************************************
   * This file is part of Kvazaar HEVC encoder.
   *
   * Copyright (c) 2021, Tampere University, ITU/ISO/IEC, project contributors
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   * 
   * * Redistributions of source code must retain the above copyright notice, this
   *   list of conditions and the following disclaimer.
   * 
   * * Redistributions in binary form must reproduce the above copyright notice, this
   *   list of conditions and the following disclaimer in the documentation and/or
   *   other materials provided with the distribution.
   * 
   * * Neither the name of the Tampere University or ITU/ISO/IEC nor the names of its
   *   contributors may be used to endorse or promote products derived from
   *   this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
   ****************************************************************************/
  
  /*
   * \ingroup Bitstream
   * \file
   * Network Abstraction Layer (NAL) messages.
   */
  
  #include "bitstream.h"
  #include "global.h" // IWYU pragma: keep
  #include "kvazaar.h"
  
  
  #define SEI_HASH_MAX_LENGTH 16
  
  //////////////////////////////////////////////////////////////////////////
  // FUNCTIONS
  void kvz_nal_write(bitstream_t * const bitstream, const uint8_t nal_type,
                 const uint8_t temporal_id, const int long_start_code);
  void kvz_image_checksum(const kvz_picture *im,
                        unsigned char checksum_out[][SEI_HASH_MAX_LENGTH], const uint8_t bitdepth);
  void kvz_image_md5(const kvz_picture *im,
                     unsigned char checksum_out[][SEI_HASH_MAX_LENGTH],
                     const uint8_t bitdepth);
  
  
  
  #endif
  