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/*
* 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 "modules/audio_processing/echo_detector/normalized_covariance_estimator.h"
#include "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
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