| |
| /* |
| * 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/modules/audio_processing/echo_detector/normalized_covariance_estimator.h" |
| #include "webrtc/test/gtest.h" |
| |
| namespace webrtc { |
| |
| TEST(NormalizedCovarianceEstimatorTests, IdenticalSignalTest) { |
| NormalizedCovarianceEstimator test_estimator; |
| for (size_t i = 0; i < 10000; i++) { |
| test_estimator.Update(1.f, 0.f, 1.f, 1.f, 0.f, 1.f); |
| test_estimator.Update(-1.f, 0.f, 1.f, -1.f, 0.f, 1.f); |
| } |
| // A normalized covariance value close to 1 is expected. |
| EXPECT_NEAR(1.f, test_estimator.normalized_cross_correlation(), 0.01f); |
| test_estimator.Clear(); |
| EXPECT_EQ(0.f, test_estimator.normalized_cross_correlation()); |
| } |
| |
| TEST(NormalizedCovarianceEstimatorTests, OppositeSignalTest) { |
| NormalizedCovarianceEstimator test_estimator; |
| // Insert the same value many times. |
| for (size_t i = 0; i < 10000; i++) { |
| test_estimator.Update(1.f, 0.f, 1.f, -1.f, 0.f, 1.f); |
| test_estimator.Update(-1.f, 0.f, 1.f, 1.f, 0.f, 1.f); |
| } |
| // A normalized covariance value close to -1 is expected. |
| EXPECT_NEAR(-1.f, test_estimator.normalized_cross_correlation(), 0.01f); |
| } |
| |
| } // namespace webrtc |
