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1 /* | |
2 * Copyright 2014 The WebRTC Project Authors. All rights reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #include <math.h> | |
12 | |
13 #include "webrtc/base/gunit.h" | |
14 #include "webrtc/base/exp_filter.h" | |
15 | |
16 namespace rtc { | |
17 | |
18 TEST(ExpFilterTest, FirstTimeOutputEqualInput) { | |
19 // No max value defined. | |
20 ExpFilter filter = ExpFilter(0.9f); | |
21 filter.Apply(100.0f, 10.0f); | |
22 | |
23 // First time, first argument no effect. | |
24 double value = 10.0f; | |
25 EXPECT_FLOAT_EQ(value, filter.filtered()); | |
26 } | |
27 | |
28 TEST(ExpFilterTest, SecondTime) { | |
29 double value; | |
30 | |
31 ExpFilter filter = ExpFilter(0.9f); | |
32 filter.Apply(100.0f, 10.0f); | |
33 | |
34 // First time, first argument no effect. | |
35 value = 10.0f; | |
36 | |
37 filter.Apply(10.0f, 20.0f); | |
38 double alpha = pow(0.9f, 10.0f); | |
39 value = alpha * value + (1.0f - alpha) * 20.0f; | |
40 EXPECT_FLOAT_EQ(value, filter.filtered()); | |
41 } | |
42 | |
43 TEST(ExpFilterTest, Reset) { | |
44 ExpFilter filter = ExpFilter(0.9f); | |
45 filter.Apply(100.0f, 10.0f); | |
46 | |
47 filter.Reset(0.8f); | |
48 filter.Apply(100.0f, 1.0f); | |
49 | |
50 // Become first time after a reset. | |
51 double value = 1.0f; | |
52 EXPECT_FLOAT_EQ(value, filter.filtered()); | |
53 } | |
54 | |
55 TEST(ExpfilterTest, OutputLimitedByMax) { | |
56 double value; | |
57 | |
58 // Max value defined. | |
59 ExpFilter filter = ExpFilter(0.9f, 1.0f); | |
60 filter.Apply(100.0f, 10.0f); | |
61 | |
62 // Limited to max value. | |
63 value = 1.0f; | |
64 EXPECT_EQ(value, filter.filtered()); | |
65 | |
66 filter.Apply(1.0f, 0.0f); | |
67 value = 0.9f * value; | |
68 EXPECT_FLOAT_EQ(value, filter.filtered()); | |
69 } | |
70 | |
71 } // namespace rtc | |
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