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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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