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| 1 |
| 2 /* |
| 3 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 4 * |
| 5 * Use of this source code is governed by a BSD-style license |
| 6 * that can be found in the LICENSE file in the root of the source |
| 7 * tree. An additional intellectual property rights grant can be found |
| 8 * in the file PATENTS. All contributing project authors may |
| 9 * be found in the AUTHORS file in the root of the source tree. |
| 10 */ |
| 11 |
| 12 #include "webrtc/modules/audio_processing/echo_detector/normalized_covariance_es
timator.h" |
| 13 #include "webrtc/test/gtest.h" |
| 14 |
| 15 namespace webrtc { |
| 16 |
| 17 TEST(NormalizedCovarianceEstimatorTests, IdenticalSignalTest) { |
| 18 NormalizedCovarianceEstimator test_estimator; |
| 19 for (size_t i = 0; i < 10000; i++) { |
| 20 test_estimator.Update(1.f, 0.f, 1.f, 1.f, 0.f, 1.f); |
| 21 test_estimator.Update(-1.f, 0.f, 1.f, -1.f, 0.f, 1.f); |
| 22 } |
| 23 // A normalized covariance value close to 1 is expected. |
| 24 EXPECT_NEAR(1.f, test_estimator.normalized_cross_correlation(), 0.01f); |
| 25 test_estimator.Clear(); |
| 26 EXPECT_EQ(0.f, test_estimator.normalized_cross_correlation()); |
| 27 } |
| 28 |
| 29 TEST(NormalizedCovarianceEstimatorTests, OppositeSignalTest) { |
| 30 NormalizedCovarianceEstimator test_estimator; |
| 31 // Insert the same value many times. |
| 32 for (size_t i = 0; i < 10000; i++) { |
| 33 test_estimator.Update(1.f, 0.f, 1.f, -1.f, 0.f, 1.f); |
| 34 test_estimator.Update(-1.f, 0.f, 1.f, 1.f, 0.f, 1.f); |
| 35 } |
| 36 // A normalized covariance value close to -1 is expected. |
| 37 EXPECT_NEAR(-1.f, test_estimator.normalized_cross_correlation(), 0.01f); |
| 38 } |
| 39 |
| 40 } // namespace webrtc |
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