tag_share.h

Go to the documentation of this file.

/* -*- c++ -*- */
/*
 * Copyright 2017 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_BLOCKS_TAG_SHARE_H
#define INCLUDED_BLOCKS_TAG_SHARE_H

#include <gnuradio/blocks/api.h>
#include <gnuradio/sync_block.h>

namespace gr {
  namespace blocks {

    /*!
     * \brief Adds tags from Input 1 onto Input 0's stream.
     * \ingroup blocks
     *
     * \details
     * This block utilizes the GNU Radio runtime's tag propagation policy
     * to transfer or share Input 1's tags to Input 0's stream. This is
     * useful when a signal is detected via a correlate_access_code_bb or
     * a threshold crossing from a complex_to_mag_squared block. The tag from
     * that detection is on the alternate stream, either bytes or floats.
     * Often there is further signal processing that should be done on the
     * complex stream. This block allows the detection tags to be added to
     * the complex stream to trigger downstream processing without the need of
     * redundant trigger inputs on all subsequent blocks.
     */
    class BLOCKS_API tag_share : virtual public gr::sync_block
    {
     public:
      typedef boost::shared_ptr<tag_share> sptr;

      /*!
       * \param sizeof_io_item The size of the Input 0/Output 0 stream type. Input 0
       * stream items will be directly copied to Output 0.
       * \param sizeof_share_item The size of the Input 1 (tag share) stream type. This
       * stream type does not have to match the input/output stream type. Tags from
       * Input 1's items will be combined with Input 0's item tags and outputted on
       * Output 0.
       * \param vlen The vector size of the input and output stream items
       */
      static sptr make(size_t sizeof_io_item, size_t sizeof_share_item, size_t vlen = 1);
    };

  } // namespace blocks
} // namespace gr

#endif /* INCLUDED_BLOCKS_TAG_SHARE_H */