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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 <vector>
#include "webrtc/modules/audio_processing/residual_echo_detector.h"
#include "webrtc/test/gtest.h"
namespace webrtc {
TEST(ResidualEchoDetectorTests, Echo) {
ResidualEchoDetector echo_detector;
echo_detector.SetReliabilityForTest(1.0f);
std::vector<float> ones(160, 1.f);
std::vector<float> zeros(160, 0.f);
// In this test the capture signal has a delay of 10 frames w.r.t. the render
// signal, but is otherwise identical. Both signals are periodic with a 20
// frame interval.
for (int i = 0; i < 1000; i++) {
if (i % 20 == 0) {
echo_detector.AnalyzeRenderAudio(ones);
echo_detector.AnalyzeCaptureAudio(zeros);
} else if (i % 20 == 10) {
echo_detector.AnalyzeRenderAudio(zeros);
echo_detector.AnalyzeCaptureAudio(ones);
} else {
echo_detector.AnalyzeRenderAudio(zeros);
echo_detector.AnalyzeCaptureAudio(zeros);
}
}
// We expect to detect echo with near certain likelihood.
EXPECT_NEAR(1.f, echo_detector.echo_likelihood(), 0.01f);
}
TEST(ResidualEchoDetectorTests, NoEcho) {
ResidualEchoDetector echo_detector;
echo_detector.SetReliabilityForTest(1.0f);
std::vector<float> ones(160, 1.f);
std::vector<float> zeros(160, 0.f);
// In this test the capture signal is always zero, so no echo should be
// detected.
for (int i = 0; i < 1000; i++) {
if (i % 20 == 0) {
echo_detector.AnalyzeRenderAudio(ones);
} else {
echo_detector.AnalyzeRenderAudio(zeros);
}
echo_detector.AnalyzeCaptureAudio(zeros);
}
// We expect to not detect any echo.
EXPECT_NEAR(0.f, echo_detector.echo_likelihood(), 0.01f);
}
TEST(ResidualEchoDetectorTests, EchoWithRenderClockDrift) {
ResidualEchoDetector echo_detector;
echo_detector.SetReliabilityForTest(1.0f);
std::vector<float> ones(160, 1.f);
std::vector<float> zeros(160, 0.f);
// In this test the capture signal has a delay of 10 frames w.r.t. the render
// signal, but is otherwise identical. Both signals are periodic with a 20
// frame interval. There is a simulated clock drift of 1% in this test, with
// the render side producing data slightly faster.
for (int i = 0; i < 1000; i++) {
if (i % 20 == 0) {
echo_detector.AnalyzeRenderAudio(ones);
echo_detector.AnalyzeCaptureAudio(zeros);
} else if (i % 20 == 10) {
echo_detector.AnalyzeRenderAudio(zeros);
echo_detector.AnalyzeCaptureAudio(ones);
} else {
echo_detector.AnalyzeRenderAudio(zeros);
echo_detector.AnalyzeCaptureAudio(zeros);
}
if (i % 100 == 0) {
// This is causing the simulated clock drift.
echo_detector.AnalyzeRenderAudio(zeros);
}
}
// We expect to detect echo with high likelihood. Clock drift is harder to
// correct on the render side than on the capture side. This is due to the
// render buffer, clock drift can only be discovered after a certain delay.
// A growing buffer can be caused by jitter or clock drift and it's not
// possible to make this decision right away. For this reason we only expect
// an echo likelihood of 75% in this test.
EXPECT_GT(echo_detector.echo_likelihood(), 0.75f);
}
TEST(ResidualEchoDetectorTests, EchoWithCaptureClockDrift) {
ResidualEchoDetector echo_detector;
echo_detector.SetReliabilityForTest(1.0f);
std::vector<float> ones(160, 1.f);
std::vector<float> zeros(160, 0.f);
// In this test the capture signal has a delay of 10 frames w.r.t. the render
// signal, but is otherwise identical. Both signals are periodic with a 20
// frame interval. There is a simulated clock drift of 1% in this test, with
// the capture side producing data slightly faster.
for (int i = 0; i < 1000; i++) {
if (i % 20 == 0) {
echo_detector.AnalyzeRenderAudio(ones);
echo_detector.AnalyzeCaptureAudio(zeros);
} else if (i % 20 == 10) {
echo_detector.AnalyzeRenderAudio(zeros);
echo_detector.AnalyzeCaptureAudio(ones);
} else {
echo_detector.AnalyzeRenderAudio(zeros);
echo_detector.AnalyzeCaptureAudio(zeros);
}
if (i % 100 == 0) {
// This is causing the simulated clock drift.
echo_detector.AnalyzeCaptureAudio(zeros);
}
}
// We expect to detect echo with near certain likelihood.
EXPECT_NEAR(1.f, echo_detector.echo_likelihood(), 0.01f);
}
} // namespace webrtc
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