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Roman Khassraf7cccb522015-08-04 12:26:54 +02001/* -*- c++ -*- */
2/* @file
3 * @author Roman Khassraf <rkhassraf@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 "dummy_burst_filter_impl.h"
29#include <stdio.h>
30#include <grgsm/endian.h>
31#include <grgsm/gsmtap.h>
32
33
34namespace gr {
35 namespace gsm {
36
37 // dummy burst defined in gsm 05.02, section 5.2.6
38 const int8_t dummy_burst_filter_impl::d_dummy_burst[] = {0,0,0,
39 1,1,1,1,1,0,1,1,0,1,1,1,0,1,1,0,
40 0,0,0,0,1,0,1,0,0,1,0,0,1,1,1,0,
41 0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0,
42 0,0,0,1,1,1,1,1,0,0,0,1,1,1,0,0,
43 0,1,0,1,1,1,0,0,0,1,0,1,1,1,0,0,
44 0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,0,
45 0,0,1,1,0,0,1,1,0,0,1,1,1,0,0,1,
46 1,1,1,0,1,0,0,1,1,1,1,1,0,0,0,1,
47 0,0,1,0,1,1,1,1,1,0,1,0,1,0,
48 0,0,0 };
49
50 dummy_burst_filter::sptr
51 dummy_burst_filter::make()
52 {
53 return gnuradio::get_initial_sptr
54 (new dummy_burst_filter_impl());
55 }
56
57 /*
58 * The private constructor
59 */
60 dummy_burst_filter_impl::dummy_burst_filter_impl()
61 : gr::block("dummy_burst_filter",
62 gr::io_signature::make(0, 0, 0),
63 gr::io_signature::make(0, 0, 0))
64 {
65 message_port_register_in(pmt::mp("in"));
66 message_port_register_out(pmt::mp("out"));
67
68 set_msg_handler(pmt::mp("in"), boost::bind(&dummy_burst_filter_impl::process_burst, this, _1));
69 }
70
71 /*
72 * Our virtual destructor.
73 */
74 dummy_burst_filter_impl::~dummy_burst_filter_impl() {}
75
76 void dummy_burst_filter_impl::process_burst(pmt::pmt_t msg)
77 {
78 pmt::pmt_t header_plus_burst = pmt::cdr(msg);
79 int8_t * burst = (int8_t *)(pmt::blob_data(header_plus_burst)) + sizeof(gsmtap_hdr);
80 size_t burst_len = pmt::blob_length(header_plus_burst) - sizeof(gsmtap_hdr);
81
82 if (!is_dummy_burst(burst, burst_len))
83 {
84 message_port_pub(pmt::mp("out"), msg);
85 }
86 }
87
88 bool dummy_burst_filter_impl::is_dummy_burst(int8_t *burst, size_t burst_len)
89 {
90 if (burst_len != DUMMY_BURST_LEN)
91 {
92 return false;
93 }
94 for (int i=0; i<DUMMY_BURST_LEN; i++)
95 {
96 if (burst[i] != d_dummy_burst[i])
97 {
98 return false;
99 }
100 }
101 return true;
102 }
103
104 } /* namespace gsm */
105} /* namespace gr */