blob: f3dd7d9bbbe31df99dd1c7bf6406e85797127747 [file] [log] [blame]
/*
* Copyright (c) 2017 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/aec3/erle_estimator.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
constexpr int kLowFrequencyLimit = kFftLengthBy2 / 2;
void VerifyErle(const std::array<float, kFftLengthBy2Plus1>& erle,
float erle_time_domain,
float reference_lf,
float reference_hf) {
std::for_each(
erle.begin(), erle.begin() + kLowFrequencyLimit,
[reference_lf](float a) { EXPECT_NEAR(reference_lf, a, 0.001); });
std::for_each(
erle.begin() + kLowFrequencyLimit, erle.end(),
[reference_hf](float a) { EXPECT_NEAR(reference_hf, a, 0.001); });
EXPECT_NEAR(reference_lf, erle_time_domain, 0.001);
}
} // namespace
// Verifies that the correct ERLE estimates are achieved.
TEST(ErleEstimator, Estimates) {
std::array<float, kFftLengthBy2Plus1> X2;
std::array<float, kFftLengthBy2Plus1> E2;
std::array<float, kFftLengthBy2Plus1> Y2;
ErleEstimator estimator(1.f, 8.f, 1.5f);
// Verifies that the ERLE estimate is properley increased to higher values.
X2.fill(500 * 1000.f * 1000.f);
E2.fill(1000.f * 1000.f);
Y2.fill(10 * E2[0]);
for (size_t k = 0; k < 200; ++k) {
estimator.Update(X2, Y2, E2);
}
VerifyErle(estimator.Erle(), estimator.ErleTimeDomain(), 8.f, 1.5f);
// Verifies that the ERLE is not immediately decreased when the ERLE in the
// data decreases.
Y2.fill(0.1f * E2[0]);
for (size_t k = 0; k < 98; ++k) {
estimator.Update(X2, Y2, E2);
}
VerifyErle(estimator.Erle(), estimator.ErleTimeDomain(), 8.f, 1.5f);
// Verifies that the minimum ERLE is eventually achieved.
for (size_t k = 0; k < 1000; ++k) {
estimator.Update(X2, Y2, E2);
}
VerifyErle(estimator.Erle(), estimator.ErleTimeDomain(), 1.f, 1.f);
// Verifies that the ERLE estimate is is not updated for low-level render
// signals.
X2.fill(1000.f * 1000.f);
Y2.fill(10 * E2[0]);
for (size_t k = 0; k < 200; ++k) {
estimator.Update(X2, Y2, E2);
}
VerifyErle(estimator.Erle(), estimator.ErleTimeDomain(), 1.f, 1.f);
}
} // namespace webrtc