Index: webrtc/video/quality_threshold_unittest.cc |
diff --git a/webrtc/video/quality_threshold_unittest.cc b/webrtc/video/quality_threshold_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..dcd094c2216646c40346c29dfa62ad88ac33063c |
--- /dev/null |
+++ b/webrtc/video/quality_threshold_unittest.cc |
@@ -0,0 +1,97 @@ |
+/* |
+ * Copyright (c) 2016 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 "webrtc/video/quality_threshold.h" |
+ |
+#include "webrtc/test/gtest.h" |
+ |
+namespace webrtc { |
+ |
+TEST(QualityThresholdTest, BackAndForth) { |
+ const int kLowThreshold = 0; |
+ const int kHighThreshold = 1; |
+ const float kFraction = 0.75f; |
+ const int kMaxMeasurements = 10; |
+ |
+ QualityThreshold thresh(kLowThreshold, kHighThreshold, kFraction, |
+ kMaxMeasurements); |
+ |
+ const int kNeededMeasurements = |
+ static_cast<int>(kFraction * kMaxMeasurements + 1); |
+ for (int i = 0; i < kNeededMeasurements; ++i) { |
+ EXPECT_FALSE(thresh.IsHigh()); |
+ thresh.AddMeasurement(kLowThreshold); |
+ } |
+ ASSERT_TRUE(thresh.IsHigh()); |
+ for (int i = 0; i < kNeededMeasurements; ++i) { |
+ EXPECT_FALSE(*thresh.IsHigh()); |
+ thresh.AddMeasurement(kHighThreshold); |
+ } |
+ EXPECT_TRUE(*thresh.IsHigh()); |
+ |
+ for (int i = 0; i < kNeededMeasurements; ++i) { |
+ EXPECT_TRUE(*thresh.IsHigh()); |
+ thresh.AddMeasurement(kLowThreshold); |
+ } |
+ EXPECT_FALSE(*thresh.IsHigh()); |
+} |
+ |
+TEST(QualityThresholdTest, Variance) { |
+ const int kLowThreshold = 0; |
+ const int kHighThreshold = 1; |
+ const float kFraction = 0.8f; |
+ const int kMaxMeasurements = 10; |
+ const double kMaxError = 0.01; |
+ |
+ // Previously randomly generated values... |
+ int values[] = {51, 79, 80, 56, 19, 20, 48, 57, 48, 25, 2, 25, 38, 37, 25}; |
+ // ...with precomputed variances. |
+ double variances[] = {476.9, 687.6, 552, 336.4, 278.767, 265.167}; |
+ |
+ QualityThreshold thresh(kLowThreshold, kHighThreshold, kFraction, |
+ kMaxMeasurements); |
+ |
+ for (int i = 0; i < kMaxMeasurements; ++i) { |
+ EXPECT_FALSE(thresh.CalculateVariance()); |
+ thresh.AddMeasurement(values[i]); |
+ } |
+ |
+ ASSERT_TRUE(thresh.CalculateVariance()); |
+ EXPECT_NEAR(variances[0], *thresh.CalculateVariance(), kMaxError); |
+ for (unsigned int i = 1; i < sizeof(variances) / sizeof(double); ++i) { |
+ thresh.AddMeasurement(values[i + kMaxMeasurements - 1]); |
+ EXPECT_NEAR(variances[i], *thresh.CalculateVariance(), kMaxError); |
+ } |
+ |
+ for (int i = 0; i < kMaxMeasurements; ++i) { |
+ thresh.AddMeasurement(42); |
+ } |
+ EXPECT_NEAR(0, *thresh.CalculateVariance(), kMaxError); |
+} |
+ |
+TEST(QualityThresholdTest, BetweenThresholds) { |
+ const int kLowThreshold = 0; |
+ const int kHighThreshold = 2; |
+ const float kFraction = 0.6f; |
+ const int kMaxMeasurements = 10; |
+ |
+ const int kBetweenThresholds = (kLowThreshold + kHighThreshold) / 2; |
+ |
+ QualityThreshold thresh(kLowThreshold, kHighThreshold, kFraction, |
+ kMaxMeasurements); |
+ |
+ for (int i = 0; i < 2 * kMaxMeasurements; ++i) { |
+ EXPECT_FALSE(thresh.IsHigh()); |
+ thresh.AddMeasurement(kBetweenThresholds); |
+ } |
+ EXPECT_FALSE(thresh.IsHigh()); |
+} |
+ |
+} // namespace webrtc |