atsc_syminfo_impl.h

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/* -*- c++ -*- */
/*
 * Copyright 2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */
#ifndef INCLUDED_GR_DTV_ATSC_SYMINFO_H
#define INCLUDED_GR_DTV_ATSC_SYMINFO_H

namespace gr {
  namespace dtv {
    namespace atsc {

      static const unsigned int SI_SEGMENT_NUM_MASK       = 0x1ff;
      static const unsigned int SI_FIELD_SYNC_SEGMENT_NUM = SI_SEGMENT_NUM_MASK;  // conceptually -1

      struct syminfo {
        unsigned int    symbol_num      : 10;   // 0..831
        unsigned int    segment_num     :  9;   // 0..311 and SI_FIELD_SYNC_SEGMENT_NUM
        unsigned int    field_num       :  1;   // 0..1
        unsigned int    valid           :  1;   // contents are valid
      };


      static inline bool
      tag_is_start_field_sync (syminfo tag)
      {
        return tag.symbol_num == 0 && tag.segment_num == SI_FIELD_SYNC_SEGMENT_NUM && tag.valid;
      }

      static inline bool
      tag_is_start_field_sync_1 (syminfo tag)
      {
        return tag_is_start_field_sync (tag) && tag.field_num == 0;
      }

      static inline bool
      tag_is_start_field_sync_2 (syminfo tag)
      {
        return tag_is_start_field_sync (tag) && tag.field_num == 1;
      }

    } /* namespace atsc */
  } /* namespace dtv */
} /* namespace gr */

#endif /* INCLUDED_GR_DTV_ATSC_SYMINFO_H */