97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/* -*- 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 */
|