text: /* -*- c++ -*- */
  /* Copyright 2012 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_TAGGED_STREAM_MUX_H
  #define INCLUDED_TAGGED_STREAM_MUX_H
  
  #include <gnuradio/blocks/api.h>
  #include <gnuradio/tagged_stream_block.h>
  
  namespace gr {
    namespace blocks {
  
      /*!
       * \brief Combines tagged streams.
       * \ingroup stream_operators_blk
       *
       * \details
       * Takes N streams as input. Each stream is tagged with packet lengths.
       * Packets are output sequentially from each input stream.
       *
       * The output signal has a new length tag, which is the sum of all
       * individual length tags. The old length tags are discarded.
       *
       * All other tags are propagated as expected, i.e. they stay associated
       * with the same input item.
       * There are cases when this behaviour is undesirable. One special case
       * is when a tag at the first element (the head item) of one input port
       * must stay on the head item of the output port. To achieve this,
       * set \p tag_preserve_head_pos to the port that will receive these special
       * tags.
       */
      class BLOCKS_API tagged_stream_mux : virtual public tagged_stream_block
      {
       public:
        typedef boost::shared_ptr<tagged_stream_mux> sptr;
  
        /*!
         * Make a tagged stream mux block.
         *
         * \param itemsize Items size (number of bytes per item)
         * \param lengthtagname Length tag key
         * \param tag_preserve_head_pos Preserves the head position of tags on this input port
         */
        static sptr make(size_t itemsize, const std::string &lengthtagname, unsigned int tag_preserve_head_pos=0);
      };
  
    } // namespace blocks
  } // namespace gr
  
  #endif /* INCLUDED_TAGGED_STREAM_MUX_H */
  
  