udp_source_impl.h

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/* -*- c++ -*- */
/*
 * Copyright 2007-2010,2013 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_UDP_SOURCE_IMPL_H
#define INCLUDED_GR_UDP_SOURCE_IMPL_H

#include <blocks/udp_source.h>
#include <boost/asio.hpp>
#include <boost/format.hpp>
#include <gruel/thread.h>

namespace gr {
  namespace blocks {

    class udp_source_impl : public udp_source
    {
    private:
      size_t  d_itemsize;
      int     d_payload_size; // maximum transmission unit (packet length)
      bool    d_eof;          // look for an EOF signal
      bool    d_connected;    // are we connected?
      char   *d_rxbuf;        // get UDP buffer items
      char   *d_residbuf;     // hold buffer between calls
      ssize_t d_residual;     // hold information about number of bytes stored in residbuf
      ssize_t d_sent;         // track how much of d_residbuf we've outputted
      size_t  d_offset;       // point to residbuf location offset

      std::string d_host;
      unsigned short d_port;

      boost::asio::ip::udp::socket *d_socket;
      boost::asio::ip::udp::endpoint d_endpoint;
      boost::asio::ip::udp::endpoint d_endpoint_rcvd;
      boost::asio::io_service d_io_service;

      gruel::condition_variable d_cond_wait;
      gruel::mutex d_udp_mutex;
      gruel::thread d_udp_thread;

      void start_receive();
      void handle_read(const boost::system::error_code& error,
                       size_t bytes_transferred);
      void run_io_service() { d_io_service.run(); }

    public:
      udp_source_impl(size_t itemsize,
                      const std::string &host, int port,
                      int payload_size, bool eof);
      ~udp_source_impl();

      void connect(const std::string &host, int port);
      void disconnect();

      int payload_size() { return d_payload_size; }
      int get_port();

      int work(int noutput_items,
               gr_vector_const_void_star &input_items,
               gr_vector_void_star &output_items);
    };

  } /* namespace blocks */
} /* namespace gr */

#endif /* INCLUDED_GR_UDP_SOURCE_H */