aboutsummaryrefslogtreecommitdiffstats
path: root/src/fig/FIG0_21.cpp
blob: 51b4a0d71032f926ddf8b773f00bec69a7bcd9f3 (plain)
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
200
201
202
203
204
205
206
207
208
209
210
211
/*
   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) 2017
   Matthias P. Braendli, matthias.braendli@mpb.li
   */
/*
   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/FIG0_21.h"
#include "utils.h"

namespace FIC {

FIG0_21::FIG0_21(FIGRuntimeInformation *rti) :
    m_rti(rti),
    m_initialised(false)
{
}

FillStatus FIG0_21::fill(uint8_t *buf, size_t max_size)
{
    FillStatus fs;
    size_t remaining = max_size;
    auto ensemble = m_rti->ensemble;

    if (not m_initialised) {
        freqInfoFIG0_21 = ensemble->frequency_information.begin();
        m_initialised = true;
    }

    FIGtype0* fig0 = nullptr;

    for (; freqInfoFIG0_21 != ensemble->frequency_information.end();
            ++freqInfoFIG0_21) {

        size_t required_size = sizeof(struct FIGtype0_21_header);

        if (fig0 == nullptr) {
            if (remaining < 2 + required_size) {
                break;
            }
            fig0 = (FIGtype0*)buf;
            fig0->FIGtypeNumber = 0;
            fig0->Length = 1;

            // Database start or continuation flag, EN 300 401 Clause 5.2.2.1 part b)
            fig0->CN =
                (freqInfoFIG0_21 == ensemble->frequency_information.begin() ? 0 : 1);
            fig0->OE = 0;
            fig0->PD = false;
            fig0->Extension = 21;

            buf += 2;
            remaining -= 2;
        }

        if (remaining < required_size) {
            break;
        }

        for (const auto& fle : (*freqInfoFIG0_21)->frequency_information) {
            size_t list_entry_size = sizeof(FIGtype0_21_fi_list_header);
            switch (fle.rm) {
                case RangeModulation::dab_ensemble:
                    list_entry_size += fle.fi_dab.frequencies.size() * 3;
                    break;
                case RangeModulation::fm_with_rds:
                    list_entry_size += fle.fi_fm.frequencies.size() * 3;
                    break;
                case RangeModulation::amss:
                    list_entry_size += 1; // Id field 2
                    list_entry_size += fle.fi_amss.frequencies.size() * 3;
                    break;
                case RangeModulation::drm:
                    list_entry_size += 1; // Id field 2
                    list_entry_size += fle.fi_drm.frequencies.size() * 3;
                    break;
            }

            if (remaining < list_entry_size) {
                break;
            }

            auto *fig0_21_header = (FIGtype0_21_header*)buf;
            fig0_21_header->rfa = 0; // This was RegionId in EN 300 401 V1.4.1
            switch (fle.rm) {
                case RangeModulation::dab_ensemble:
                    fig0_21_header->length_fi = fle.fi_dab.frequencies.size();
                    break;
                case RangeModulation::fm_with_rds:
                    fig0_21_header->length_fi = fle.fi_fm.frequencies.size();
                    break;
                case RangeModulation::drm:
                    fig0_21_header->length_fi = fle.fi_drm.frequencies.size();
                    break;
                case RangeModulation::amss:
                    fig0_21_header->length_fi = fle.fi_amss.frequencies.size();
                    break;
            }

            fig0->Length += sizeof(struct FIGtype0_21_header);
            buf += sizeof(struct FIGtype0_21_header);
            remaining -= sizeof(struct FIGtype0_21_header);

            auto *fi_list_header = (FIGtype0_21_fi_list_header*)buf;
            fig0->Length += sizeof(struct FIGtype0_21_fi_list_header);
            buf += sizeof(struct FIGtype0_21_fi_list_header);
            remaining -= sizeof(struct FIGtype0_21_fi_list_header);

            fi_list_header->continuity = fle.continuity;

            switch (fle.rm) {
                case RangeModulation::dab_ensemble:
                    fi_list_header->id = fle.fi_dab.eid;
                    fi_list_header->range_modulation = static_cast<uint8_t>(fle.rm);
                    assert(fle.fi_dab.frequencies.size() < 8);
                    fi_list_header->length_freq_list = fle.fi_dab.frequencies.size();

                    for (const auto& freq : fle.fi_dab.frequencies) {
                        auto *field = (FIGtype0_21_fi_dab_entry*)buf;
                        field->control_field = static_cast<uint8_t>(freq.control_field);
                        field->setFreq(static_cast<uint32_t>(
                                    freq.frequency * 1000.0f / 16.0f));

                        fig0->Length += 3;
                        buf += 3;
                        remaining -= 3;
                    }
                    break;
                case RangeModulation::fm_with_rds:
                    fi_list_header->id = fle.fi_fm.pi_code;

                    for (const auto& freq : fle.fi_fm.frequencies) {
                        // RealFreq = 87.5 MHz + (F * 100kHz)
                        // => F = (RealFreq - 87.5 MHz) / 100kHz
                        // Do the whole calculation in kHz:
                        *buf = (freq * 1000.0f - 87500.0f) / 100.0f;
                        fig0->Length += 1;
                        buf += 1;
                        remaining -= 1;
                    }
                    break;
                case RangeModulation::drm:
                    fi_list_header->id = (fle.fi_drm.drm_service_id) & 0xFFFF;

                    // Id field 2
                    *buf = (fle.fi_drm.drm_service_id >> 16) & 0xFF;
                    fig0->Length += 1;
                    buf += 1;
                    remaining -= 1;

                    for (const auto& freq : fle.fi_drm.frequencies) {
                        uint16_t *freq_field = (uint16_t*)buf;

                        *freq_field = static_cast<uint16_t>(freq * 1000.0f);

                        fig0->Length += 2;
                        buf += 2;
                        remaining -= 2;
                    }
                    break;
                case RangeModulation::amss:
                    fi_list_header->id = (fle.fi_amss.amss_service_id) & 0xFFFF;

                    // Id field 2
                    *buf = (fle.fi_amss.amss_service_id >> 16) & 0xFF;
                    fig0->Length += 1;
                    buf += 1;
                    remaining -= 1;

                    for (const auto& freq : fle.fi_amss.frequencies) {
                        uint16_t *freq_field = (uint16_t*)buf;

                        *freq_field = static_cast<uint16_t>(freq * 1000.0f);

                        fig0->Length += 2;
                        buf += 2;
                        remaining -= 2;
                    }
                    break;
            }
        } // for over fle
    } // for over FI

    if (freqInfoFIG0_21 == ensemble->frequency_information.end()) {
        fs.complete_fig_transmitted = true;
    }

    fs.num_bytes_written = max_size - remaining;
    return fs;
}

}