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
|
/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Her Majesty the
Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2014, 2015
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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-DabMod 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-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TIMESTAMP_DECODER_H
#define TIMESTAMP_DECODER_H
#include <queue>
#include <memory>
#include <string>
#include <time.h>
#include <math.h>
#include <stdio.h>
#include "Eti.h"
#include "Log.h"
#include "RemoteControl.h"
struct frame_timestamp
{
// Which frame count does this timestamp apply to
int32_t fct;
uint32_t timestamp_sec;
double timestamp_pps_offset;
bool timestamp_valid;
bool timestamp_refresh;
struct frame_timestamp operator=(const struct frame_timestamp &rhs)
{
if (this != &rhs) {
this->timestamp_sec = rhs.timestamp_sec;
this->timestamp_pps_offset = rhs.timestamp_pps_offset;
this->timestamp_valid = rhs.timestamp_valid;
this->timestamp_refresh = rhs.timestamp_refresh;
this->fct = rhs.fct;
}
return *this;
}
struct frame_timestamp& operator+=(const double& diff)
{
double offset_pps, offset_secs;
offset_pps = modf(diff, &offset_secs);
this->timestamp_sec += lrintf(offset_secs);
this->timestamp_pps_offset += offset_pps;
while (this->timestamp_pps_offset > 1)
{
this->timestamp_pps_offset -= 1.0;
this->timestamp_sec += 1;
};
return *this;
}
const struct frame_timestamp operator+(const double diff)
{
struct frame_timestamp ts = *this;
ts += diff;
return ts;
}
void print(const char* t)
{
fprintf(stderr,
"%s <struct frame_timestamp(%s, %d, %.9f, %d)>\n",
t, this->timestamp_valid ? "valid" : "invalid",
this->timestamp_sec, this->timestamp_pps_offset,
this->fct);
}
};
/* This module decodes MNSC time information */
class TimestampDecoder : public RemoteControllable
{
public:
TimestampDecoder(
/* The modulator adds this offset to the TIST to define time of
* frame transmission
*/
double offset_s,
/* Specifies by how many stages the timestamp must be delayed.
* (e.g. The FIRFilter is pipelined, therefore we must increase
* tist_delay_stages by one if the filter is used
*/
unsigned tist_delay_stages) :
RemoteControllable("tist")
{
timestamp_offset = offset_s;
m_tist_delay_stages = tist_delay_stages;
inhibit_second_update = 0;
time_pps = 0.0;
time_secs = 0;
latestFCT = 0;
enableDecode = false;
full_timestamp_received_mnsc = false;
gmtime_r(0, &temp_time);
offset_changed = false;
RC_ADD_PARAMETER(offset, "TIST offset [s]");
etiLog.level(info) << "Setting up timestamp decoder with " <<
timestamp_offset << " offset";
};
/* Calculate the timestamp for the current frame. */
void calculateTimestamp(struct frame_timestamp& ts);
/* Update timestamp data from data in ETI */
void updateTimestampEti(
int framephase,
uint16_t mnsc,
double pps,
int32_t fct);
/*********** REMOTE CONTROL ***************/
/* virtual void enrol_at(BaseRemoteController& controller)
* is inherited
*/
/* Base function to set parameters. */
virtual void set_parameter(const std::string& parameter,
const std::string& value);
/* Getting a parameter always returns a string. */
virtual const std::string get_parameter(
const std::string& parameter) const;
const char* name() { return "TS"; }
protected:
/* Push a new MNSC field into the decoder */
void pushMNSCData(int framephase, uint16_t mnsc);
/* Each frame contains the TIST field with the PPS offset.
* For each frame, this function must be called to update
* the timestamp
*/
void updateTimestampPPS(double pps);
/* Update the timestamp when a full set of MNSC data is
* known. This function can be called at most every four
* frames when the data is transferred using the MNSC.
*/
void updateTimestampSeconds(uint32_t secs);
struct tm temp_time;
uint32_t time_secs;
int32_t latestFCT;
double time_pps;
double timestamp_offset;
unsigned m_tist_delay_stages;
int inhibit_second_update;
bool offset_changed;
/* When the type or identifier don't match, the decoder must
* be disabled
*/
bool enableDecode;
/* Disable timstamps until full time has been received in mnsc */
bool full_timestamp_received_mnsc;
/* when pipelining, we must shift the calculated timestamps
* through this queue. Otherwise, it would not be possible to
* synchronise two modulators if only one uses (for instance) the
* FIRFilter (1 stage pipeline)
*/
std::queue<std::shared_ptr<struct frame_timestamp> > queue_timestamps;
};
#endif
|
