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| 1 /* |
| 2 * Copyright (c) 2016 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 "webrtc/video/quality_threshold.h" |
| 12 |
| 13 #include "webrtc/test/gtest.h" |
| 14 |
| 15 namespace webrtc { |
| 16 |
| 17 TEST(QualityThresholdTest, BackAndForth) { |
| 18 const int kLowThreshold = 0; |
| 19 const int kHighThreshold = 1; |
| 20 const float kFraction = 0.75f; |
| 21 const int kMaxMeasurements = 10; |
| 22 |
| 23 QualityThreshold thresh(kLowThreshold, kHighThreshold, kFraction, |
| 24 kMaxMeasurements); |
| 25 |
| 26 const int kNeededMeasurements = |
| 27 static_cast<int>(kFraction * kMaxMeasurements + 1); |
| 28 for (int i = 0; i < kNeededMeasurements; ++i) { |
| 29 EXPECT_FALSE(thresh.IsHigh()); |
| 30 thresh.AddMeasurement(kLowThreshold); |
| 31 } |
| 32 ASSERT_TRUE(thresh.IsHigh()); |
| 33 for (int i = 0; i < kNeededMeasurements; ++i) { |
| 34 EXPECT_FALSE(*thresh.IsHigh()); |
| 35 thresh.AddMeasurement(kHighThreshold); |
| 36 } |
| 37 EXPECT_TRUE(*thresh.IsHigh()); |
| 38 |
| 39 for (int i = 0; i < kNeededMeasurements; ++i) { |
| 40 EXPECT_TRUE(*thresh.IsHigh()); |
| 41 thresh.AddMeasurement(kLowThreshold); |
| 42 } |
| 43 EXPECT_FALSE(*thresh.IsHigh()); |
| 44 } |
| 45 |
| 46 TEST(QualityThresholdTest, Variance) { |
| 47 const int kLowThreshold = 0; |
| 48 const int kHighThreshold = 1; |
| 49 const float kFraction = 0.8f; |
| 50 const int kMaxMeasurements = 10; |
| 51 const double kMaxError = 0.01; |
| 52 |
| 53 // Previously randomly generated values... |
| 54 int values[] = {51, 79, 80, 56, 19, 20, 48, 57, 48, 25, 2, 25, 38, 37, 25}; |
| 55 // ...with precomputed variances. |
| 56 double variances[] = {476.9, 687.6, 552, 336.4, 278.767, 265.167}; |
| 57 |
| 58 QualityThreshold thresh(kLowThreshold, kHighThreshold, kFraction, |
| 59 kMaxMeasurements); |
| 60 |
| 61 for (int i = 0; i < kMaxMeasurements; ++i) { |
| 62 EXPECT_FALSE(thresh.CalculateVariance()); |
| 63 thresh.AddMeasurement(values[i]); |
| 64 } |
| 65 |
| 66 ASSERT_TRUE(thresh.CalculateVariance()); |
| 67 EXPECT_NEAR(variances[0], *thresh.CalculateVariance(), kMaxError); |
| 68 for (unsigned int i = 1; i < sizeof(variances) / sizeof(double); ++i) { |
| 69 thresh.AddMeasurement(values[i + kMaxMeasurements - 1]); |
| 70 EXPECT_NEAR(variances[i], *thresh.CalculateVariance(), kMaxError); |
| 71 } |
| 72 |
| 73 for (int i = 0; i < kMaxMeasurements; ++i) { |
| 74 thresh.AddMeasurement(42); |
| 75 } |
| 76 EXPECT_NEAR(0, *thresh.CalculateVariance(), kMaxError); |
| 77 } |
| 78 |
| 79 TEST(QualityThresholdTest, BetweenThresholds) { |
| 80 const int kLowThreshold = 0; |
| 81 const int kHighThreshold = 2; |
| 82 const float kFraction = 0.6f; |
| 83 const int kMaxMeasurements = 10; |
| 84 |
| 85 const int kBetweenThresholds = (kLowThreshold + kHighThreshold) / 2; |
| 86 |
| 87 QualityThreshold thresh(kLowThreshold, kHighThreshold, kFraction, |
| 88 kMaxMeasurements); |
| 89 |
| 90 for (int i = 0; i < 2 * kMaxMeasurements; ++i) { |
| 91 EXPECT_FALSE(thresh.IsHigh()); |
| 92 thresh.AddMeasurement(kBetweenThresholds); |
| 93 } |
| 94 EXPECT_FALSE(thresh.IsHigh()); |
| 95 } |
| 96 |
| 97 } // namespace webrtc |
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