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/* -*- c++ -*- */
/*
* Copyright 2005,2012 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_GR_PACKET_SINK_H
#define INCLUDED_GR_PACKET_SINK_H
#include <gnuradio/digital/api.h>
#include <gnuradio/sync_block.h>
#include <gnuradio/msg_queue.h>
namespace gr {
namespace digital {
/*!
* \brief process received bits looking for packet sync, header,
* and process bits into packet
* \ingroup packet_operators_blk
*
* \details
* input: stream of symbols to be sliced.
*
* output: none. Pushes assembled packet into target queue
*
* The packet sink takes in a stream of binary symbols that are
* sliced around 0. The bits are then checked for the \p
* sync_vector to determine find and decode the packet. It then
* expects a fixed length header of 2 16-bit shorts containing the
* payload length, followed by the payload. If the 2 16-bit shorts
* are not identical, this packet is ignored. Better algs are
* welcome.
*
* This block is not very useful anymore as it only works with
* 2-level modulations such as BPSK or GMSK. The block can
* generally be replaced with a correlate access code and frame
* sink blocks.
*/
class DIGITAL_API packet_sink : virtual public sync_block
{
public:
// gr::digital::packet_sink::sptr
typedef boost::shared_ptr<packet_sink> sptr;
/*!
* Make a packet_sink block.
*
* \param sync_vector The synchronization vector as a vector of 1's and 0's.
* \param target_queue The message queue that packets are sent to.
* \param threshold Number of bits that can be incorrect in the \p sync_vector.
*/
static sptr make(const std::vector<unsigned char>& sync_vector,
msg_queue::sptr target_queue,
int threshold=-1);
//! return true if we detect carrier
virtual bool carrier_sensed() const = 0;
};
} /* namespace digital */
} /* namespace gr */
#endif /* INCLUDED_GR_PACKET_SINK_H */
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