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/*
* 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/echo_path_delay_estimator.h"
#include <algorithm>
#include <string>
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/aec3/render_delay_buffer.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
#include "modules/audio_processing/test/echo_canceller_test_tools.h"
#include "rtc_base/random.h"
#include "rtc_base/strings/string_builder.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
std::string ProduceDebugText(size_t delay, size_t down_sampling_factor) {
rtc::StringBuilder ss;
ss << "Delay: " << delay;
ss << ", Down sampling factor: " << down_sampling_factor;
return ss.Release();
}
} // namespace
class EchoPathDelayEstimatorMultiChannel
: public ::testing::Test,
public ::testing::WithParamInterface<std::tuple<size_t, size_t>> {};
INSTANTIATE_TEST_SUITE_P(MultiChannel,
EchoPathDelayEstimatorMultiChannel,
::testing::Combine(::testing::Values(1, 2, 3, 6, 8),
::testing::Values(1, 2, 4)));
// Verifies that the basic API calls work.
TEST_P(EchoPathDelayEstimatorMultiChannel, BasicApiCalls) {
const size_t num_render_channels = std::get<0>(GetParam());
const size_t num_capture_channels = std::get<1>(GetParam());
constexpr int kSampleRateHz = 48000;
constexpr size_t kNumBands = NumBandsForRate(kSampleRateHz);
ApmDataDumper data_dumper(0);
EchoCanceller3Config config;
std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
RenderDelayBuffer::Create(config, kSampleRateHz, num_render_channels));
EchoPathDelayEstimator estimator(&data_dumper, config, num_capture_channels);
Block render(kNumBands, num_render_channels);
Block capture(/*num_bands=*/1, num_capture_channels);
for (size_t k = 0; k < 100; ++k) {
render_delay_buffer->Insert(render);
estimator.EstimateDelay(render_delay_buffer->GetDownsampledRenderBuffer(),
capture);
}
}
// Verifies that the delay estimator produces correct delay for artificially
// delayed signals.
TEST(EchoPathDelayEstimator, DelayEstimation) {
constexpr size_t kNumRenderChannels = 1;
constexpr size_t kNumCaptureChannels = 1;
constexpr int kSampleRateHz = 48000;
constexpr size_t kNumBands = NumBandsForRate(kSampleRateHz);
Random random_generator(42U);
Block render(kNumBands, kNumRenderChannels);
Block capture(/*num_bands=*/1, kNumCaptureChannels);
ApmDataDumper data_dumper(0);
constexpr size_t kDownSamplingFactors[] = {2, 4, 8};
for (auto down_sampling_factor : kDownSamplingFactors) {
EchoCanceller3Config config;
config.delay.delay_headroom_samples = 0;
config.delay.down_sampling_factor = down_sampling_factor;
config.delay.num_filters = 10;
for (size_t delay_samples : {30, 64, 150, 200, 800, 4000}) {
SCOPED_TRACE(ProduceDebugText(delay_samples, down_sampling_factor));
std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
RenderDelayBuffer::Create(config, kSampleRateHz, kNumRenderChannels));
DelayBuffer<float> signal_delay_buffer(delay_samples);
EchoPathDelayEstimator estimator(&data_dumper, config,
kNumCaptureChannels);
absl::optional<DelayEstimate> estimated_delay_samples;
for (size_t k = 0; k < (500 + (delay_samples) / kBlockSize); ++k) {
RandomizeSampleVector(&random_generator,
render.View(/*band=*/0, /*channel=*/0));
signal_delay_buffer.Delay(render.View(/*band=*/0, /*channel=*/0),
capture.View(/*band=*/0, /*channel=*/0));
render_delay_buffer->Insert(render);
if (k == 0) {
render_delay_buffer->Reset();
}
render_delay_buffer->PrepareCaptureProcessing();
auto estimate = estimator.EstimateDelay(
render_delay_buffer->GetDownsampledRenderBuffer(), capture);
if (estimate) {
estimated_delay_samples = estimate;
}
}
if (estimated_delay_samples) {
// Allow estimated delay to be off by a block as internally the delay is
// quantized with an error up to a block.
size_t delay_ds = delay_samples / down_sampling_factor;
size_t estimated_delay_ds =
estimated_delay_samples->delay / down_sampling_factor;
EXPECT_NEAR(delay_ds, estimated_delay_ds,
kBlockSize / down_sampling_factor);
} else {
ADD_FAILURE();
}
}
}
}
// Verifies that the delay estimator does not produce delay estimates for render
// signals of low level.
TEST(EchoPathDelayEstimator, NoDelayEstimatesForLowLevelRenderSignals) {
constexpr size_t kNumRenderChannels = 1;
constexpr size_t kNumCaptureChannels = 1;
constexpr int kSampleRateHz = 48000;
constexpr size_t kNumBands = NumBandsForRate(kSampleRateHz);
Random random_generator(42U);
EchoCanceller3Config config;
Block render(kNumBands, kNumRenderChannels);
Block capture(/*num_bands=*/1, kNumCaptureChannels);
ApmDataDumper data_dumper(0);
EchoPathDelayEstimator estimator(&data_dumper, config, kNumCaptureChannels);
std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
RenderDelayBuffer::Create(EchoCanceller3Config(), kSampleRateHz,
kNumRenderChannels));
for (size_t k = 0; k < 100; ++k) {
RandomizeSampleVector(&random_generator,
render.View(/*band=*/0, /*channel=*/0));
for (auto& render_k : render.View(/*band=*/0, /*channel=*/0)) {
render_k *= 100.f / 32767.f;
}
std::copy(render.begin(/*band=*/0, /*channel=*/0),
render.end(/*band=*/0, /*channel=*/0),
capture.begin(/*band*/ 0, /*channel=*/0));
render_delay_buffer->Insert(render);
render_delay_buffer->PrepareCaptureProcessing();
EXPECT_FALSE(estimator.EstimateDelay(
render_delay_buffer->GetDownsampledRenderBuffer(), capture));
}
}
#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
// Verifies the check for the render blocksize.
// TODO(peah): Re-enable the test once the issue with memory leaks during DEATH
// tests on test bots has been fixed.
TEST(EchoPathDelayEstimatorDeathTest, DISABLED_WrongRenderBlockSize) {
ApmDataDumper data_dumper(0);
EchoCanceller3Config config;
EchoPathDelayEstimator estimator(&data_dumper, config, 1);
std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
RenderDelayBuffer::Create(config, 48000, 1));
Block capture(/*num_bands=*/1, /*num_channels=*/1);
EXPECT_DEATH(estimator.EstimateDelay(
render_delay_buffer->GetDownsampledRenderBuffer(), capture),
"");
}
// Verifies the check for non-null data dumper.
TEST(EchoPathDelayEstimatorDeathTest, NullDataDumper) {
EXPECT_DEATH(EchoPathDelayEstimator(nullptr, EchoCanceller3Config(), 1), "");
}
#endif
} // namespace webrtc
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