packet_headergenerator_bb.h

/* -*- c++ -*- */
/* Copyright 2012 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */

#ifndef INCLUDED_PACKET_HEADERGENERATOR_BB_H
#define INCLUDED_PACKET_HEADERGENERATOR_BB_H

#include <gnuradio/digital/api.h>
#include <gnuradio/digital/packet_header_default.h>
#include <gnuradio/tagged_stream_block.h>

namespace gr {
namespace digital {

/*!
 * \brief Generates a header for a tagged, streamed packet.
 * \ingroup packet_operators_blk
 *
 * \details
 * Input: A tagged stream. This is consumed entirely, it is not appended
 *        to the output stream.
 * Output: An tagged stream containing the header. The details on the header
 *         are set in a header formatter object (of type packet_header_default
 *         or a subclass thereof). If only a number of bits is specified, a
 *         default header is generated (see packet_header_default).
 */
class DIGITAL_API packet_headergenerator_bb : virtual public tagged_stream_block
{
public:
    typedef std::shared_ptr<packet_headergenerator_bb> sptr;

    /* \param header_formatter A header formatter object.
     * \param len_tag_key Length tag key. Note that for header generation,
     *                    it is irrelevant which tag names are set in the
     *                    formatter object, only this value is relevant!
     */
    static sptr make(const packet_header_default::sptr& header_formatter,
                     const std::string& len_tag_key = "packet_len");

    /* \param header_len If this value is given, a packet_header_default
     *                   object is used to generate the header. This is
     *                   the number of bits per header.
     * \param len_tag_key Length tag key.
     */
    static sptr make(long header_len, const std::string& len_tag_key = "packet_len");

    virtual void set_header_formatter(packet_header_default::sptr header_formatter) = 0;
};

} // namespace digital
} // namespace gr

#endif /* INCLUDED_PACKET_HEADERGENERATOR_BB_H */