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
|
/*
* Sample Buffer - Allows reading and writing of timed samples
*
* Copyright 2010,2011 Free Software Foundation, Inc.
* Copyright (C) 2015 Ettus Research LLC
* Copyright 2019 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* Author: Tom Tsou <tom.tsou@ettus.com>
*
* SPDX-License-Identifier: AGPL-3.0+
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* See the COPYING file in the main directory for details.
*/
#include "smpl_buf.h"
#include <inttypes.h>
smpl_buf::smpl_buf(size_t len)
: buf_len(len)
{
reset();
data = new uint32_t[len];
}
smpl_buf::~smpl_buf()
{
delete[] data;
}
void smpl_buf::reset()
{
time_start = 0;
time_end = 0;
data_start = 0;
data_end = 0;
}
ssize_t smpl_buf::avail_smpls(TIMESTAMP timestamp) const
{
if (timestamp < time_start)
return ERROR_TIMESTAMP;
else if (timestamp >= time_end)
return 0;
else
return time_end - timestamp;
}
ssize_t smpl_buf::read(void *buf, size_t len, TIMESTAMP timestamp)
{
int type_sz = 2 * sizeof(short);
// Check for valid read
if (timestamp < time_start)
return ERROR_TIMESTAMP;
if (timestamp >= time_end)
return 0;
if (len >= buf_len)
return ERROR_READ;
// How many samples should be copied
size_t num_smpls = time_end - timestamp;
if (num_smpls > len)
num_smpls = len;
// Starting index
size_t read_start = (data_start + (timestamp - time_start)) % buf_len;
// Read it
if (read_start + num_smpls < buf_len) {
size_t numBytes = len * type_sz;
memcpy(buf, data + read_start, numBytes);
} else {
size_t first_cp = (buf_len - read_start) * type_sz;
size_t second_cp = len * type_sz - first_cp;
memcpy(buf, data + read_start, first_cp);
memcpy((char*) buf + first_cp, data, second_cp);
}
data_start = (read_start + len) % buf_len;
time_start = timestamp + len;
if (time_start > time_end)
return ERROR_READ;
else
return num_smpls;
}
ssize_t smpl_buf::write(void *buf, size_t len, TIMESTAMP timestamp)
{
int type_sz = 2 * sizeof(short);
// Check for valid write
if ((len == 0) || (len >= buf_len))
return ERROR_WRITE;
if ((timestamp + len) <= time_end)
return ERROR_TIMESTAMP;
if (timestamp < time_end) {
LOGC(DDEV, ERR) << "Overwriting old buffer data: timestamp="
<< timestamp << " time_end=" << time_end;
// Do not return error here, because it's a rounding error and is not fatal
}
if (timestamp > time_end && time_end != 0) {
LOGC(DDEV, ERR) << "Skipping buffer data: timestamp="
<< timestamp << " time_end=" << time_end;
// Do not return error here, because it's a rounding error and is not fatal
}
// Starting index
size_t write_start = (data_start + (timestamp - time_start)) % buf_len;
// Write it
if ((write_start + len) < buf_len) {
size_t numBytes = len * type_sz;
memcpy(data + write_start, buf, numBytes);
} else {
size_t first_cp = (buf_len - write_start) * type_sz;
size_t second_cp = len * type_sz - first_cp;
memcpy(data + write_start, buf, first_cp);
memcpy(data, (char*) buf + first_cp, second_cp);
}
data_end = (write_start + len) % buf_len;
time_end = timestamp + len;
if (!data_start)
data_start = write_start;
if (((write_start + len) > buf_len) && (data_end > data_start))
return ERROR_OVERFLOW;
else if (time_end <= time_start)
return ERROR_WRITE;
else
return len;
}
std::string smpl_buf::str_status(TIMESTAMP timestamp) const
{
std::ostringstream ost("Sample buffer: ");
ost << "timestamp = " << timestamp;
ost << ", length = " << buf_len;
ost << ", time_start = " << time_start;
ost << ", time_end = " << time_end;
ost << ", data_start = " << data_start;
ost << ", data_end = " << data_end;
return ost.str();
}
std::string smpl_buf::str_code(int code)
{
switch (code) {
case ERROR_TIMESTAMP:
return "Sample buffer: Requested timestamp is not valid";
case ERROR_READ:
return "Sample buffer: Read error";
case ERROR_WRITE:
return "Sample buffer: Write error";
case ERROR_OVERFLOW:
return "Sample buffer: Overrun";
default:
std::stringstream ss;
ss << "Sample buffer: Unknown error " << code;
return ss.str();
}
}
|
