1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/* -*- c++ -*- */
/* @file
* @author (C) 2015 by Roman Khassraf <rkhassraf@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 <gnuradio/io_signature.h>
#include "burst_sdcch_subslot_filter_impl.h"
#include <stdio.h>
#include <grgsm/endian.h>
#include <grgsm/gsmtap.h>
namespace gr {
namespace gsm {
burst_sdcch_subslot_filter::sptr
burst_sdcch_subslot_filter::make(subslot_filter_mode mode, unsigned int subslot)
{
return gnuradio::get_initial_sptr
(new burst_sdcch_subslot_filter_impl(mode, subslot));
}
/*
* The private constructor
*/
burst_sdcch_subslot_filter_impl::burst_sdcch_subslot_filter_impl(subslot_filter_mode mode, unsigned int subslot)
: gr::block("burst_sdcch_subslot_filter",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0)),
d_mode(mode),
d_subslot(subslot),
d_filter_policy(FILTER_POLICY_DEFAULT)
{
message_port_register_in(pmt::mp("in"));
message_port_register_out(pmt::mp("out"));
set_msg_handler(pmt::mp("in"), boost::bind(&burst_sdcch_subslot_filter_impl::process_burst, this, _1));
}
/*
* Our virtual destructor.
*/
burst_sdcch_subslot_filter_impl::~burst_sdcch_subslot_filter_impl() {}
void burst_sdcch_subslot_filter_impl::process_burst(pmt::pmt_t msg)
{
// hardcoded subslots of the channels, both SDCCH and the associated SACCH
// -1 means that the particular position in the frame is not SDCCH
static const int8_t subslots_sdcch4[102] = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
};
static const int8_t subslots_sdcch8[102] = {
0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
};
if (d_filter_policy == FILTER_POLICY_DROP_ALL)
return;
if (d_filter_policy == FILTER_POLICY_PASS_ALL) {
message_port_pub(pmt::mp("out"), msg);
return;
}
pmt::pmt_t header_plus_burst = pmt::cdr(msg);
gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
uint32_t frame_nr = be32toh(header->frame_number);
uint32_t fn_mod102 = frame_nr % 102;
int8_t subslot;
if (d_mode == SS_FILTER_SDCCH8)
{
subslot = subslots_sdcch8[fn_mod102];
}
else if (d_mode == SS_FILTER_SDCCH4)
{
subslot = subslots_sdcch4[fn_mod102];
}
if ((subslot == -1) || (d_mode == SS_FILTER_SDCCH4 && subslot > 3))
{
return;
}
if (subslot == d_subslot)
{
message_port_pub(pmt::mp("out"), msg);
}
}
/* External API */
unsigned int
burst_sdcch_subslot_filter_impl::get_ss(void)
{
return d_subslot;
}
unsigned int
burst_sdcch_subslot_filter_impl::set_ss(unsigned int ss)
{
if ((d_mode == SS_FILTER_SDCCH8 && ss < 8)
|| (d_mode == SS_FILTER_SDCCH4 && ss < 4))
d_subslot = ss;
return d_subslot;
}
subslot_filter_mode
burst_sdcch_subslot_filter_impl::get_mode(void)
{
return d_mode;
}
subslot_filter_mode
burst_sdcch_subslot_filter_impl::set_mode(subslot_filter_mode mode)
{
d_mode = mode;
return d_mode;
}
/* Filtering policy */
filter_policy
burst_sdcch_subslot_filter_impl::get_policy(void)
{
return d_filter_policy;
}
filter_policy
burst_sdcch_subslot_filter_impl::set_policy(filter_policy policy)
{
d_filter_policy = policy;
return d_filter_policy;
}
} /* namespace gsm */
} /* namespace gr */
|
