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
|
/*
* Copyright 2014 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/numerics/exp_filter.h"
#include <cmath>
#include "test/gtest.h"
namespace rtc {
TEST(ExpFilterTest, FirstTimeOutputEqualInput) {
// No max value defined.
ExpFilter filter = ExpFilter(0.9f);
filter.Apply(100.0f, 10.0f);
// First time, first argument no effect.
double value = 10.0f;
EXPECT_FLOAT_EQ(value, filter.filtered());
}
TEST(ExpFilterTest, SecondTime) {
float value;
ExpFilter filter = ExpFilter(0.9f);
filter.Apply(100.0f, 10.0f);
// First time, first argument no effect.
value = 10.0f;
filter.Apply(10.0f, 20.0f);
float alpha = std::pow(0.9f, 10.0f);
value = alpha * value + (1.0f - alpha) * 20.0f;
EXPECT_FLOAT_EQ(value, filter.filtered());
}
TEST(ExpFilterTest, Reset) {
ExpFilter filter = ExpFilter(0.9f);
filter.Apply(100.0f, 10.0f);
filter.Reset(0.8f);
filter.Apply(100.0f, 1.0f);
// Become first time after a reset.
double value = 1.0f;
EXPECT_FLOAT_EQ(value, filter.filtered());
}
TEST(ExpfilterTest, OutputLimitedByMax) {
double value;
// Max value defined.
ExpFilter filter = ExpFilter(0.9f, 1.0f);
filter.Apply(100.0f, 10.0f);
// Limited to max value.
value = 1.0f;
EXPECT_EQ(value, filter.filtered());
filter.Apply(1.0f, 0.0f);
value = 0.9f * value;
EXPECT_FLOAT_EQ(value, filter.filtered());
}
} // namespace rtc
|
