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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
2011, 2012 Her Majesty the Queen in Right of Canada (Communications
Research Center Canada)
Copyright (C) 2021 Matthias P. Braendli
http://www.opendigitalradio.org
*/
/*
This file is part of ODR-DabMux.
ODR-DabMux 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 of the
License, or (at your option) any later version.
ODR-DabMux 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 ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#include "fig/FIG0structs.h"
#include "fig/FIG0_9.h"
#include "utils.h"
#include <map>
using namespace std;
namespace FIC {
struct FIGtype0_9 {
uint8_t Length:5;
uint8_t FIGtypeNumber:3;
uint8_t Extension:5;
uint8_t PD:1;
uint8_t OE:1;
uint8_t CN:1;
uint8_t ensembleLto:6;
uint8_t rfa1:1;
uint8_t ext:1;
uint8_t ensembleEcc;
uint8_t tableId;
} PACKED;
struct FIGtype0_9_Subfield {
uint8_t Rfa2:6;
uint8_t NumServices:2;
uint8_t ecc;
// Followed by list of NumServices uint16_t SIDs
} PACKED;
FIG0_9::FIG0_9(FIGRuntimeInformation *rti) :
m_rti(rti) {}
FillStatus FIG0_9::fill(uint8_t *buf, size_t max_size)
{
FillStatus fs;
auto ensemble = m_rti->ensemble;
size_t remaining = max_size;
if (m_extended_fields.empty()) {
map<uint8_t, list<uint16_t> > ecc_to_services;
for (const auto& srv : ensemble->services) {
if (srv->ecc != 0 and srv->ecc != ensemble->ecc and srv->isProgramme(ensemble)) {
if (srv->id > 0xFFFF) {
throw std::logic_error("Service ID for programme service > 0xFFFF");
}
ecc_to_services[srv->ecc].push_back(srv->id);
}
}
// Reorganise the data so that it fits into the
// extended field. Max 3 SIds per sub-field.
for (auto& ecc_sids_pair : ecc_to_services) {
FIG0_9_Extended_Field ef;
ef.ecc = ecc_sids_pair.first;
size_t i = 0;
for (auto& sid : ecc_sids_pair.second) {
if (i == 3) {
m_extended_fields.push_back(ef);
ef.sids.clear();
i = 0;
}
ef.sids.push_back(sid);
i++;
}
if (not ef.sids.empty()) {
m_extended_fields.push_back(ef);
}
}
// Max length of extended field is 25 bytes
size_t subfield_required = 0;
for (const auto& ef : m_extended_fields) {
subfield_required += ef.required_bytes();
}
if (subfield_required > 25) {
etiLog.level(error) << "Cannot transmit FIG 0/9: too many services with different ECC";
}
for (const auto& ef : m_extended_fields) {
stringstream ss;
ss << "FIG0_9 Ext ECC 0x" << hex << (int)ef.ecc << dec << ":";
for (auto& sid : ef.sids) {
ss << " " << hex << (int)sid << dec;
}
ss << ".";
etiLog.level(debug) << ss.str();
}
}
// Transmitting a FIG0/9 without any extended field was the CEI in EN 300 401 v1.
// It went away in v2, and I interpret this that it is impossible to transmit
// more than 11 services with a different ECC.
size_t required = 5;
for (const auto& ef : m_extended_fields) {
required += ef.required_bytes();
}
if (remaining < required) {
fs.num_bytes_written = 0;
return fs;
}
auto fig0_9 = (FIGtype0_9*)buf;
fig0_9->FIGtypeNumber = 0;
fig0_9->Length = 4;
fig0_9->CN = 0;
fig0_9->OE = 0;
fig0_9->PD = 0;
fig0_9->Extension = 9;
fig0_9->ext = m_extended_fields.empty() ? 0 : 1;
fig0_9->rfa1 = 0; // Had a different meaning in EN 300 401 V1.4.1
if (ensemble->lto_auto) {
time_t now = time(NULL);
struct tm ltime;
localtime_r(&now, <ime);
time_t now2 = timegm(<ime);
ensemble->lto = (now2 - now) / 1800;
}
if (ensemble->lto >= 0) {
fig0_9->ensembleLto = ensemble->lto;
}
else {
/* Convert to 1-complement representation */
fig0_9->ensembleLto = (-ensemble->lto) | (1<<5);
}
fig0_9->ensembleEcc = ensemble->ecc;
fig0_9->tableId = ensemble->international_table;
buf += 5;
remaining -= 5;
for (const auto& ef : m_extended_fields) {
if (ef.required_bytes() > remaining) {
throw logic_error("Wrong FIG0/9 length calculation");
}
if (ef.sids.size() > 3) {
throw logic_error("Wrong FIG0/9 subfield generation");
}
auto subfield = (FIGtype0_9_Subfield*)buf;
subfield->NumServices = ef.sids.size();
subfield->Rfa2 = 0;
subfield->ecc = ef.ecc;
buf += 2;
fig0_9->Length += 2;
remaining -= 2;
for (uint16_t sid : ef.sids) {
uint16_t *sid_field = (uint16_t*)buf;
*sid_field = htons(sid);
buf += 2;
fig0_9->Length += 2;
remaining -= 2;
}
}
fs.num_bytes_written = max_size - remaining;
fs.complete_fig_transmitted = true;
return fs;
}
}
|
