Piotr Krysik | ccb5e68 | 2017-11-07 19:34:22 +0100 | [diff] [blame] | 1 | /* -*- c++ -*- */ |
| 2 | /* @file |
| 3 | * @author Piotr Krysik <ptrkrysik@gmail.com> |
| 4 | * @section LICENSE |
| 5 | * |
| 6 | * Gr-gsm is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 3, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * Gr-gsm is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with gr-gsm; see the file COPYING. If not, write to |
| 18 | * the Free Software Foundation, Inc., 51 Franklin Street, |
| 19 | * Boston, MA 02110-1301, USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #ifdef HAVE_CONFIG_H |
| 24 | #include "config.h" |
| 25 | #endif |
| 26 | |
| 27 | #include <gnuradio/io_signature.h> |
| 28 | #include <grgsm/gsmtap.h> |
| 29 | #include <grgsm/gsm_constants.h> |
| 30 | #include "preprocess_tx_burst_impl.h" |
| 31 | |
| 32 | namespace gr { |
| 33 | namespace gsm { |
| 34 | |
| 35 | preprocess_tx_burst::sptr |
| 36 | preprocess_tx_burst::make() |
| 37 | { |
| 38 | return gnuradio::get_initial_sptr |
| 39 | (new preprocess_tx_burst_impl()); |
| 40 | } |
| 41 | |
| 42 | /* |
| 43 | * The private constructor |
| 44 | */ |
| 45 | preprocess_tx_burst_impl::preprocess_tx_burst_impl() |
| 46 | : gr::block("preprocess_tx_burst", |
| 47 | gr::io_signature::make(0, 0, 0), |
| 48 | gr::io_signature::make(0, 0, 0)) |
| 49 | { |
| 50 | message_port_register_in(pmt::intern("bursts_in")); |
| 51 | message_port_register_out(pmt::intern("bursts_out")); |
| 52 | |
| 53 | set_msg_handler(pmt::intern("bursts_in"), boost::bind(&preprocess_tx_burst_impl::process_burst, this, _1)); |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Our virtual destructor. |
| 58 | */ |
| 59 | preprocess_tx_burst_impl::~preprocess_tx_burst_impl() |
| 60 | { |
| 61 | } |
| 62 | |
| 63 | void preprocess_tx_burst_impl::process_burst(pmt::pmt_t burst) |
| 64 | { |
| 65 | int8_t * header_bits = (int8_t *)(pmt::blob_data(pmt::cdr(burst))); |
| 66 | int8_t * burst_bits = (int8_t *)(pmt::blob_data(pmt::cdr(burst)))+sizeof(gsmtap_hdr); |
| 67 | |
| 68 | pmt::pmt_t header_bits_pmt = pmt::make_blob(header_bits,sizeof(gsmtap_hdr)); |
| 69 | |
| 70 | size_t burst_size = pmt::blob_length(pmt::cdr(burst))-sizeof(gsmtap_hdr); |
| 71 | if(((gsmtap_hdr*)header_bits)->sub_type == GSMTAP_BURST_ACCESS){ //cut unneeded bits from the end of access bursts |
| 72 | burst_size = ACCESS_BURST_SIZE; |
| 73 | } |
| 74 | pmt::pmt_t burst_bits_pmt = pmt::make_blob(burst_bits, burst_size); |
| 75 | |
| 76 | pmt::pmt_t pdu_first_part = pmt::car(burst); |
| 77 | // pmt::pmt_t new_pdu_first_part = pmt::dict_add( pdu_first_part, pmt::intern("gsmtap_header"), header_bits_pmt ); |
| 78 | pmt::pmt_t new_pdu_first_part = pdu_first_part; |
| 79 | |
| 80 | pmt::pmt_t new_msg = pmt::cons(new_pdu_first_part, burst_bits_pmt); |
| 81 | message_port_pub(pmt::intern("bursts_out"), new_msg); |
| 82 | } |
| 83 | } /* namespace gsm */ |
| 84 | } /* namespace gr */ |
| 85 | |