protocol_parser_b.h

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/* -*- c++ -*- */
/*
 * Copyright 2015-2016 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */
 
 
#ifndef INCLUDED_DIGITAL_PACKET_PARSE_B_H
#define INCLUDED_DIGITAL_PACKET_PARSE_B_H
 
#include <gnuradio/digital/api.h>
#include <gnuradio/digital/header_format_base.h>
#include <gnuradio/sync_block.h>
 
namespace gr {
namespace digital {
 
/*!
 * \brief Block that synchronizes to a header based on a header
 * format object class. Designed to accept hard bits and produce
 * PDUs with packed bytes (pmt::u8vector).
 *
 * \ingroup packet_operators_blk
 *
 * \details
 *
 * A packet synchronizer block. This block takes in hard bits
 * (unpacked bytes; 1's and 0's as the LSB) and finds the access
 * code as a sync word to find the start of a frame.
 *
 * The block uses a format object derived from a
 * header_format_base class.
 *
 * Once the frame is detected (usually through the use of an
 * access code), the block uses the format object's parser
 * function to decode the remaining header. Generally, as in the
 * default header case, the header will contain the length of the
 * frame's payload. That and anything else in the header will
 * generally go into the PDU's meta-data dictionary.
 *
 * The block will output a PDU that contains frame's header info
 * in the meta-data portion of the PDU and the payload itself. The
 * payload is packed hard bits as taken from the input stream.
 *
 * \sa packet_sync_ff for a soft decision version.
 */
class DIGITAL_API protocol_parser_b : virtual public sync_block
{
public:
    typedef std::shared_ptr<protocol_parser_b> sptr;
 
    /*!
     * Make a packet header block using a given \p format.
     *
     * \param format The format object to use when reading the
     *        header.
     */
    static sptr make(const header_format_base::sptr& format);
};
 
} // namespace digital
} // namespace gr
 
#endif /* INCLUDED_DIGITAL_PROTOCOL_PARSER_B_H */