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/* -*- c++ -*- */
/* @file
* @author Piotr Krysik <ptrkrysik@gmail.com>
* @author Vadim Yanitskiy <axilirator@gmail.com>
* @section LICENSE
*
* Gr-gsm 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.
*
* Gr-gsm 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 gr-gsm; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <gnuradio/io_signature.h>
#include <grgsm/gsm_constants.h>
#include <grgsm/gsmtap.h>
#include "preprocess_tx_burst_impl.h"
namespace gr {
namespace gsm {
preprocess_tx_burst::sptr
preprocess_tx_burst::make()
{
return gnuradio::get_initial_sptr
(new preprocess_tx_burst_impl());
}
/*
* The private constructor
*/
preprocess_tx_burst_impl::preprocess_tx_burst_impl()
: gr::block("preprocess_tx_burst",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0))
{
message_port_register_in(pmt::mp("bursts_in"));
message_port_register_out(pmt::mp("bursts_out"));
set_msg_handler(pmt::mp("bursts_in"),
boost::bind(&preprocess_tx_burst_impl::process_burst, this, _1));
}
/*
* Our virtual destructor.
*/
preprocess_tx_burst_impl::~preprocess_tx_burst_impl()
{
}
void preprocess_tx_burst_impl::process_burst(pmt::pmt_t msg_in)
{
pmt::pmt_t blob_in = pmt::cdr(msg_in);
// Extract GSMTAP header from message
gsmtap_hdr *burst_hdr = (gsmtap_hdr *) pmt::blob_data(blob_in);
// Extract burst bits from message
uint8_t *burst_bits = (uint8_t *)
(pmt::blob_data(blob_in)) + sizeof(gsmtap_hdr);
// Determine and check burst length
size_t burst_len = pmt::blob_length(blob_in) - sizeof(gsmtap_hdr);
assert(burst_len == BURST_SIZE);
// The Access Burst last has reduced length
if (burst_hdr->sub_type == GSMTAP_BURST_ACCESS)
burst_len = ACCESS_BURST_SIZE;
// Prepare an output message
pmt::pmt_t blob_out = pmt::make_blob(burst_bits, burst_len);
pmt::pmt_t msg_out = pmt::cons(pmt::car(msg_in), blob_out);
/* Send a message to the output */
message_port_pub(pmt::mp("bursts_out"), msg_out);
}
} /* namespace gsm */
} /* namespace gr */
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