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/* -*- c++ -*- */
/*
* Copyright 2007,2008,2009,2010 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_H
#define INCLUDED_GR_UDP_SOURCE_H
#include <gr_core_api.h>
#include <gr_sync_block.h>
#include <gruel/thread.h>
class gr_udp_source;
typedef boost::shared_ptr<gr_udp_source> gr_udp_source_sptr;
GR_CORE_API gr_udp_source_sptr gr_make_udp_source(size_t itemsize, const char *host,
unsigned short port,
int payload_size=1472,
bool eof=true, bool wait=true);
/*!
* \brief Read stream from an UDP socket.
* \ingroup source_blk
*
* \param itemsize The size (in bytes) of the item datatype
* \param host The name or IP address of the receiving host; can be
* NULL, None, or "0.0.0.0" to allow reading from any
* interface on the host
* \param port The port number on which to receive data; use 0 to
* have the system assign an unused port number
* \param payload_size UDP payload size by default set to 1472 =
* (1500 MTU - (8 byte UDP header) - (20 byte IP header))
* \param eof Interpret zero-length packet as EOF (default: true)
* \param wait Wait for data if not immediately available
* (default: true)
*
*/
class GR_CORE_API gr_udp_source : public gr_sync_block
{
friend GR_CORE_API gr_udp_source_sptr gr_make_udp_source(size_t itemsize,
const char *host,
unsigned short port,
int payload_size,
bool eof, bool wait);
private:
size_t d_itemsize;
int d_payload_size; // maximum transmission unit (packet length)
bool d_eof; // zero-length packet is EOF
bool d_wait; // wait if data if not immediately available
int d_socket; // handle to socket
char *d_temp_buff; // hold buffer between calls
ssize_t d_residual; // hold information about number of bytes stored in the temp buffer
size_t d_temp_offset; // point to temp buffer location offset
protected:
/*!
* \brief UDP Source Constructor
*
* \param itemsize The size (in bytes) of the item datatype
* \param host The name or IP address of the receiving host; can be
* NULL, None, or "0.0.0.0" to allow reading from any
* interface on the host
* \param port The port number on which to receive data; use 0 to
* have the system assign an unused port number
* \param payload_size UDP payload size by default set to 1472 =
* (1500 MTU - (8 byte UDP header) - (20 byte IP header))
* \param eof Interpret zero-length packet as EOF (default: true)
* \param wait Wait for data if not immediately available
* (default: true)
*/
gr_udp_source(size_t itemsize, const char *host, unsigned short port,
int payload_size, bool eof, bool wait);
public:
~gr_udp_source();
/*! \brief return the PAYLOAD_SIZE of the socket */
int payload_size() { return d_payload_size; }
/*! \brief return the port number of the socket */
int get_port();
// should we export anything else?
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
#endif /* INCLUDED_GR_UDP_SOURCE_H */
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