| /* -*- 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 */ |