modules/audio_processing/aec3/render_delay_controller_unittest.cc - src - Git at Google

 /*
  *  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/render_delay_controller.h"

 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>

 #include "modules/audio_processing/aec3/aec3_common.h"
 #include "modules/audio_processing/aec3/block_processor.h"
 #include "modules/audio_processing/aec3/decimator.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(int sample_rate_hz) {
   rtc::StringBuilder ss;
   ss << "Sample rate: " << sample_rate_hz;
   return ss.Release();
 }

 std::string ProduceDebugText(int sample_rate_hz,
                              size_t delay,
                              size_t num_render_channels,
                              size_t num_capture_channels) {
   rtc::StringBuilder ss;
   ss << ProduceDebugText(sample_rate_hz) << ", Delay: " << delay
      << ", Num render channels: " << num_render_channels
      << ", Num capture channels: " << num_capture_channels;
   return ss.Release();
 }

 constexpr size_t kDownSamplingFactors[] = {2, 4, 8};

 }  // namespace

 // Verifies the output of GetDelay when there are no AnalyzeRender calls.
 // TODO(bugs.webrtc.org/11161): Re-enable tests.
 TEST(RenderDelayController, DISABLED_NoRenderSignal) {
   for (size_t num_render_channels : {1, 2, 8}) {
     Block block(/*num_bands=1*/ 1, /*num_channels=*/1);
     EchoCanceller3Config config;
     for (size_t num_matched_filters = 4; num_matched_filters <= 10;
          num_matched_filters++) {
       for (auto down_sampling_factor : kDownSamplingFactors) {
         config.delay.down_sampling_factor = down_sampling_factor;
         config.delay.num_filters = num_matched_filters;
         for (auto rate : {16000, 32000, 48000}) {
           SCOPED_TRACE(ProduceDebugText(rate));
           std::unique_ptr<RenderDelayBuffer> delay_buffer(
               RenderDelayBuffer::Create(config, rate, num_render_channels));
           std::unique_ptr<RenderDelayController> delay_controller(
               RenderDelayController::Create(config, rate,
                                             /*num_capture_channels*/ 1));
           for (size_t k = 0; k < 100; ++k) {
             auto delay = delay_controller->GetDelay(
                 delay_buffer->GetDownsampledRenderBuffer(),
                 delay_buffer->Delay(), block);
             EXPECT_FALSE(delay->delay);
           }
         }
       }
     }
   }
 }

 // Verifies the basic API call sequence.
 // TODO(bugs.webrtc.org/11161): Re-enable tests.
 TEST(RenderDelayController, DISABLED_BasicApiCalls) {
   for (size_t num_capture_channels : {1, 2, 4}) {
     for (size_t num_render_channels : {1, 2, 8}) {
       Block capture_block(/*num_bands=*/1, num_capture_channels);
       absl::optional<DelayEstimate> delay_blocks;
       for (size_t num_matched_filters = 4; num_matched_filters <= 10;
            num_matched_filters++) {
         for (auto down_sampling_factor : kDownSamplingFactors) {
           EchoCanceller3Config config;
           config.delay.down_sampling_factor = down_sampling_factor;
           config.delay.num_filters = num_matched_filters;
           config.delay.capture_alignment_mixing.downmix = false;
           config.delay.capture_alignment_mixing.adaptive_selection = false;

           for (auto rate : {16000, 32000, 48000}) {
             Block render_block(NumBandsForRate(rate), num_render_channels);
             std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
                 RenderDelayBuffer::Create(config, rate, num_render_channels));
             std::unique_ptr<RenderDelayController> delay_controller(
                 RenderDelayController::Create(EchoCanceller3Config(), rate,
                                               num_capture_channels));
             for (size_t k = 0; k < 10; ++k) {
               render_delay_buffer->Insert(render_block);
               render_delay_buffer->PrepareCaptureProcessing();

               delay_blocks = delay_controller->GetDelay(
                   render_delay_buffer->GetDownsampledRenderBuffer(),
                   render_delay_buffer->Delay(), capture_block);
             }
             EXPECT_TRUE(delay_blocks);
             EXPECT_FALSE(delay_blocks->delay);
           }
         }
       }
     }
   }
 }

 // Verifies that the RenderDelayController is able to align the signals for
 // simple timeshifts between the signals.
 // TODO(bugs.webrtc.org/11161): Re-enable tests.
 TEST(RenderDelayController, DISABLED_Alignment) {
   Random random_generator(42U);
   for (size_t num_capture_channels : {1, 2, 4}) {
     Block capture_block(/*num_bands=*/1, num_capture_channels);
     for (size_t num_matched_filters = 4; num_matched_filters <= 10;
          num_matched_filters++) {
       for (auto down_sampling_factor : kDownSamplingFactors) {
         EchoCanceller3Config config;
         config.delay.down_sampling_factor = down_sampling_factor;
         config.delay.num_filters = num_matched_filters;
         config.delay.capture_alignment_mixing.downmix = false;
         config.delay.capture_alignment_mixing.adaptive_selection = false;

         for (size_t num_render_channels : {1, 2, 8}) {
           for (auto rate : {16000, 32000, 48000}) {
             Block render_block(NumBandsForRate(rate), num_render_channels);

             for (size_t delay_samples : {15, 50, 150, 200, 800, 4000}) {
               absl::optional<DelayEstimate> delay_blocks;
               SCOPED_TRACE(ProduceDebugText(rate, delay_samples,
                                             num_render_channels,
                                             num_capture_channels));
               std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
                   RenderDelayBuffer::Create(config, rate, num_render_channels));
               std::unique_ptr<RenderDelayController> delay_controller(
                   RenderDelayController::Create(config, rate,
                                                 num_capture_channels));
               DelayBuffer<float> signal_delay_buffer(delay_samples);
               for (size_t k = 0; k < (400 + delay_samples / kBlockSize); ++k) {
                 for (int band = 0; band < render_block.NumBands(); ++band) {
                   for (int channel = 0; channel < render_block.NumChannels();
                        ++channel) {
                     RandomizeSampleVector(&random_generator,
                                           render_block.View(band, channel));
                   }
                 }
                 signal_delay_buffer.Delay(
                     render_block.View(/*band=*/0, /*channel=*/0),
                     capture_block.View(/*band=*/0, /*channel=*/0));
                 render_delay_buffer->Insert(render_block);
                 render_delay_buffer->PrepareCaptureProcessing();
                 delay_blocks = delay_controller->GetDelay(
                     render_delay_buffer->GetDownsampledRenderBuffer(),
                     render_delay_buffer->Delay(), capture_block);
               }
               ASSERT_TRUE(!!delay_blocks);

               constexpr int kDelayHeadroomBlocks = 1;
               size_t expected_delay_blocks =
                   std::max(0, static_cast<int>(delay_samples / kBlockSize) -
                                   kDelayHeadroomBlocks);

               EXPECT_EQ(expected_delay_blocks, delay_blocks->delay);
             }
           }
         }
       }
     }
   }
 }

 // Verifies that the RenderDelayController is able to properly handle noncausal
 // delays.
 // TODO(bugs.webrtc.org/11161): Re-enable tests.
 TEST(RenderDelayController, DISABLED_NonCausalAlignment) {
   Random random_generator(42U);
   for (size_t num_capture_channels : {1, 2, 4}) {
     for (size_t num_render_channels : {1, 2, 8}) {
       for (size_t num_matched_filters = 4; num_matched_filters <= 10;
            num_matched_filters++) {
         for (auto down_sampling_factor : kDownSamplingFactors) {
           EchoCanceller3Config config;
           config.delay.down_sampling_factor = down_sampling_factor;
           config.delay.num_filters = num_matched_filters;
           config.delay.capture_alignment_mixing.downmix = false;
           config.delay.capture_alignment_mixing.adaptive_selection = false;
           for (auto rate : {16000, 32000, 48000}) {
             Block render_block(NumBandsForRate(rate), num_render_channels);
             Block capture_block(NumBandsForRate(rate), num_capture_channels);

             for (int delay_samples : {-15, -50, -150, -200}) {
               absl::optional<DelayEstimate> delay_blocks;
               SCOPED_TRACE(ProduceDebugText(rate, -delay_samples,
                                             num_render_channels,
                                             num_capture_channels));
               std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
                   RenderDelayBuffer::Create(config, rate, num_render_channels));
               std::unique_ptr<RenderDelayController> delay_controller(
                   RenderDelayController::Create(EchoCanceller3Config(), rate,
                                                 num_capture_channels));
               DelayBuffer<float> signal_delay_buffer(-delay_samples);
               for (int k = 0;
                    k < (400 - delay_samples / static_cast<int>(kBlockSize));
                    ++k) {
                 RandomizeSampleVector(
                     &random_generator,
                     capture_block.View(/*band=*/0, /*channel=*/0));
                 signal_delay_buffer.Delay(
                     capture_block.View(/*band=*/0, /*channel=*/0),
                     render_block.View(/*band=*/0, /*channel=*/0));
                 render_delay_buffer->Insert(render_block);
                 render_delay_buffer->PrepareCaptureProcessing();
                 delay_blocks = delay_controller->GetDelay(
                     render_delay_buffer->GetDownsampledRenderBuffer(),
                     render_delay_buffer->Delay(), capture_block);
               }

               ASSERT_FALSE(delay_blocks);
             }
           }
         }
       }
     }
   }
 }

 // Verifies that the RenderDelayController is able to align the signals for
 // simple timeshifts between the signals when there is jitter in the API calls.
 // TODO(bugs.webrtc.org/11161): Re-enable tests.
 TEST(RenderDelayController, DISABLED_AlignmentWithJitter) {
   Random random_generator(42U);
   for (size_t num_capture_channels : {1, 2, 4}) {
     for (size_t num_render_channels : {1, 2, 8}) {
       Block capture_block(
           /*num_bands=*/1, num_capture_channels);
       for (size_t num_matched_filters = 4; num_matched_filters <= 10;
            num_matched_filters++) {
         for (auto down_sampling_factor : kDownSamplingFactors) {
           EchoCanceller3Config config;
           config.delay.down_sampling_factor = down_sampling_factor;
           config.delay.num_filters = num_matched_filters;
           config.delay.capture_alignment_mixing.downmix = false;
           config.delay.capture_alignment_mixing.adaptive_selection = false;

           for (auto rate : {16000, 32000, 48000}) {
             Block render_block(NumBandsForRate(rate), num_render_channels);
             for (size_t delay_samples : {15, 50, 300, 800}) {
               absl::optional<DelayEstimate> delay_blocks;
               SCOPED_TRACE(ProduceDebugText(rate, delay_samples,
                                             num_render_channels,
                                             num_capture_channels));
               std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
                   RenderDelayBuffer::Create(config, rate, num_render_channels));
               std::unique_ptr<RenderDelayController> delay_controller(
                   RenderDelayController::Create(config, rate,
                                                 num_capture_channels));
               DelayBuffer<float> signal_delay_buffer(delay_samples);
               constexpr size_t kMaxTestJitterBlocks = 26;
               for (size_t j = 0; j < (1000 + delay_samples / kBlockSize) /
                                              kMaxTestJitterBlocks +
                                          1;
                    ++j) {
                 std::vector<Block> capture_block_buffer;
                 for (size_t k = 0; k < (kMaxTestJitterBlocks - 1); ++k) {
                   RandomizeSampleVector(
                       &random_generator,
                       render_block.View(/*band=*/0, /*channel=*/0));
                   signal_delay_buffer.Delay(
                       render_block.View(/*band=*/0, /*channel=*/0),
                       capture_block.View(/*band=*/0, /*channel=*/0));
                   capture_block_buffer.push_back(capture_block);
                   render_delay_buffer->Insert(render_block);
                 }
                 for (size_t k = 0; k < (kMaxTestJitterBlocks - 1); ++k) {
                   render_delay_buffer->PrepareCaptureProcessing();
                   delay_blocks = delay_controller->GetDelay(
                       render_delay_buffer->GetDownsampledRenderBuffer(),
                       render_delay_buffer->Delay(), capture_block_buffer[k]);
                 }
               }

               constexpr int kDelayHeadroomBlocks = 1;
               size_t expected_delay_blocks =
                   std::max(0, static_cast<int>(delay_samples / kBlockSize) -
                                   kDelayHeadroomBlocks);
               if (expected_delay_blocks < 2) {
                 expected_delay_blocks = 0;
               }

               ASSERT_TRUE(delay_blocks);
               EXPECT_EQ(expected_delay_blocks, delay_blocks->delay);
             }
           }
         }
       }
     }
   }
 }

 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)

 // Verifies the check for correct sample rate.
 // TODO(peah): Re-enable the test once the issue with memory leaks during DEATH
 // tests on test bots has been fixed.
 TEST(RenderDelayControllerDeathTest, DISABLED_WrongSampleRate) {
   for (auto rate : {-1, 0, 8001, 16001}) {
     SCOPED_TRACE(ProduceDebugText(rate));
     EchoCanceller3Config config;
     std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
         RenderDelayBuffer::Create(config, rate, 1));
     EXPECT_DEATH(
         std::unique_ptr<RenderDelayController>(
             RenderDelayController::Create(EchoCanceller3Config(), rate, 1)),
         "");
   }
 }

 #endif

 }  // namespace webrtc
	/*
	* 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/render_delay_controller.h"

	#include <algorithm>
	#include <memory>
	#include <string>
	#include <vector>

	#include "modules/audio_processing/aec3/aec3_common.h"
	#include "modules/audio_processing/aec3/block_processor.h"
	#include "modules/audio_processing/aec3/decimator.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(int sample_rate_hz) {
	rtc::StringBuilder ss;
	ss << "Sample rate: " << sample_rate_hz;
	return ss.Release();
	}

	std::string ProduceDebugText(int sample_rate_hz,
	size_t delay,
	size_t num_render_channels,
	size_t num_capture_channels) {
	rtc::StringBuilder ss;
	ss << ProduceDebugText(sample_rate_hz) << ", Delay: " << delay
	<< ", Num render channels: " << num_render_channels
	<< ", Num capture channels: " << num_capture_channels;
	return ss.Release();
	}

	constexpr size_t kDownSamplingFactors[] = {2, 4, 8};

	} // namespace

	// Verifies the output of GetDelay when there are no AnalyzeRender calls.
	// TODO(bugs.webrtc.org/11161): Re-enable tests.
	TEST(RenderDelayController, DISABLED_NoRenderSignal) {
	for (size_t num_render_channels : {1, 2, 8}) {
	Block block(/num_bands=1/ 1, /num_channels=/1);
	EchoCanceller3Config config;
	for (size_t num_matched_filters = 4; num_matched_filters <= 10;
	num_matched_filters++) {
	for (auto down_sampling_factor : kDownSamplingFactors) {
	config.delay.down_sampling_factor = down_sampling_factor;
	config.delay.num_filters = num_matched_filters;
	for (auto rate : {16000, 32000, 48000}) {
	SCOPED_TRACE(ProduceDebugText(rate));
	std::unique_ptr<RenderDelayBuffer> delay_buffer(
	RenderDelayBuffer::Create(config, rate, num_render_channels));
	std::unique_ptr<RenderDelayController> delay_controller(
	RenderDelayController::Create(config, rate,
	/num_capture_channels/ 1));
	for (size_t k = 0; k < 100; ++k) {
	auto delay = delay_controller->GetDelay(
	delay_buffer->GetDownsampledRenderBuffer(),
	delay_buffer->Delay(), block);
	EXPECT_FALSE(delay->delay);
	}
	}
	}
	}
	}
	}

	// Verifies the basic API call sequence.
	// TODO(bugs.webrtc.org/11161): Re-enable tests.
	TEST(RenderDelayController, DISABLED_BasicApiCalls) {
	for (size_t num_capture_channels : {1, 2, 4}) {
	for (size_t num_render_channels : {1, 2, 8}) {
	Block capture_block(/num_bands=/1, num_capture_channels);
	absl::optional<DelayEstimate> delay_blocks;
	for (size_t num_matched_filters = 4; num_matched_filters <= 10;
	num_matched_filters++) {
	for (auto down_sampling_factor : kDownSamplingFactors) {
	EchoCanceller3Config config;
	config.delay.down_sampling_factor = down_sampling_factor;
	config.delay.num_filters = num_matched_filters;
	config.delay.capture_alignment_mixing.downmix = false;
	config.delay.capture_alignment_mixing.adaptive_selection = false;

	for (auto rate : {16000, 32000, 48000}) {
	Block render_block(NumBandsForRate(rate), num_render_channels);
	std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
	RenderDelayBuffer::Create(config, rate, num_render_channels));
	std::unique_ptr<RenderDelayController> delay_controller(
	RenderDelayController::Create(EchoCanceller3Config(), rate,
	num_capture_channels));
	for (size_t k = 0; k < 10; ++k) {
	render_delay_buffer->Insert(render_block);
	render_delay_buffer->PrepareCaptureProcessing();

	delay_blocks = delay_controller->GetDelay(
	render_delay_buffer->GetDownsampledRenderBuffer(),
	render_delay_buffer->Delay(), capture_block);
	}
	EXPECT_TRUE(delay_blocks);
	EXPECT_FALSE(delay_blocks->delay);
	}
	}
	}
	}
	}
	}

	// Verifies that the RenderDelayController is able to align the signals for
	// simple timeshifts between the signals.
	// TODO(bugs.webrtc.org/11161): Re-enable tests.
	TEST(RenderDelayController, DISABLED_Alignment) {
	Random random_generator(42U);
	for (size_t num_capture_channels : {1, 2, 4}) {
	Block capture_block(/num_bands=/1, num_capture_channels);
	for (size_t num_matched_filters = 4; num_matched_filters <= 10;
	num_matched_filters++) {
	for (auto down_sampling_factor : kDownSamplingFactors) {
	EchoCanceller3Config config;
	config.delay.down_sampling_factor = down_sampling_factor;
	config.delay.num_filters = num_matched_filters;
	config.delay.capture_alignment_mixing.downmix = false;
	config.delay.capture_alignment_mixing.adaptive_selection = false;

	for (size_t num_render_channels : {1, 2, 8}) {
	for (auto rate : {16000, 32000, 48000}) {
	Block render_block(NumBandsForRate(rate), num_render_channels);

	for (size_t delay_samples : {15, 50, 150, 200, 800, 4000}) {
	absl::optional<DelayEstimate> delay_blocks;
	SCOPED_TRACE(ProduceDebugText(rate, delay_samples,
	num_render_channels,
	num_capture_channels));
	std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
	RenderDelayBuffer::Create(config, rate, num_render_channels));
	std::unique_ptr<RenderDelayController> delay_controller(
	RenderDelayController::Create(config, rate,
	num_capture_channels));
	DelayBuffer<float> signal_delay_buffer(delay_samples);
	for (size_t k = 0; k < (400 + delay_samples / kBlockSize); ++k) {
	for (int band = 0; band < render_block.NumBands(); ++band) {
	for (int channel = 0; channel < render_block.NumChannels();
	++channel) {
	RandomizeSampleVector(&random_generator,
	render_block.View(band, channel));
	}
	}
	signal_delay_buffer.Delay(
	render_block.View(/band=/0, /channel=/0),
	capture_block.View(/band=/0, /channel=/0));
	render_delay_buffer->Insert(render_block);
	render_delay_buffer->PrepareCaptureProcessing();
	delay_blocks = delay_controller->GetDelay(
	render_delay_buffer->GetDownsampledRenderBuffer(),
	render_delay_buffer->Delay(), capture_block);
	}
	ASSERT_TRUE(!!delay_blocks);

	constexpr int kDelayHeadroomBlocks = 1;
	size_t expected_delay_blocks =
	std::max(0, static_cast<int>(delay_samples / kBlockSize) -
	kDelayHeadroomBlocks);

	EXPECT_EQ(expected_delay_blocks, delay_blocks->delay);
	}
	}
	}
	}
	}
	}
	}

	// Verifies that the RenderDelayController is able to properly handle noncausal
	// delays.
	// TODO(bugs.webrtc.org/11161): Re-enable tests.
	TEST(RenderDelayController, DISABLED_NonCausalAlignment) {
	Random random_generator(42U);
	for (size_t num_capture_channels : {1, 2, 4}) {
	for (size_t num_render_channels : {1, 2, 8}) {
	for (size_t num_matched_filters = 4; num_matched_filters <= 10;
	num_matched_filters++) {
	for (auto down_sampling_factor : kDownSamplingFactors) {
	EchoCanceller3Config config;
	config.delay.down_sampling_factor = down_sampling_factor;
	config.delay.num_filters = num_matched_filters;
	config.delay.capture_alignment_mixing.downmix = false;
	config.delay.capture_alignment_mixing.adaptive_selection = false;
	for (auto rate : {16000, 32000, 48000}) {
	Block render_block(NumBandsForRate(rate), num_render_channels);
	Block capture_block(NumBandsForRate(rate), num_capture_channels);

	for (int delay_samples : {-15, -50, -150, -200}) {
	absl::optional<DelayEstimate> delay_blocks;
	SCOPED_TRACE(ProduceDebugText(rate, -delay_samples,
	num_render_channels,
	num_capture_channels));
	std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
	RenderDelayBuffer::Create(config, rate, num_render_channels));
	std::unique_ptr<RenderDelayController> delay_controller(
	RenderDelayController::Create(EchoCanceller3Config(), rate,
	num_capture_channels));
	DelayBuffer<float> signal_delay_buffer(-delay_samples);
	for (int k = 0;
	k < (400 - delay_samples / static_cast<int>(kBlockSize));
	++k) {
	RandomizeSampleVector(
	&random_generator,
	capture_block.View(/band=/0, /channel=/0));
	signal_delay_buffer.Delay(
	capture_block.View(/band=/0, /channel=/0),
	render_block.View(/band=/0, /channel=/0));
	render_delay_buffer->Insert(render_block);
	render_delay_buffer->PrepareCaptureProcessing();
	delay_blocks = delay_controller->GetDelay(
	render_delay_buffer->GetDownsampledRenderBuffer(),
	render_delay_buffer->Delay(), capture_block);
	}

	ASSERT_FALSE(delay_blocks);
	}
	}
	}
	}
	}
	}
	}

	// Verifies that the RenderDelayController is able to align the signals for
	// simple timeshifts between the signals when there is jitter in the API calls.
	// TODO(bugs.webrtc.org/11161): Re-enable tests.
	TEST(RenderDelayController, DISABLED_AlignmentWithJitter) {
	Random random_generator(42U);
	for (size_t num_capture_channels : {1, 2, 4}) {
	for (size_t num_render_channels : {1, 2, 8}) {
	Block capture_block(
	/num_bands=/1, num_capture_channels);
	for (size_t num_matched_filters = 4; num_matched_filters <= 10;
	num_matched_filters++) {
	for (auto down_sampling_factor : kDownSamplingFactors) {
	EchoCanceller3Config config;
	config.delay.down_sampling_factor = down_sampling_factor;
	config.delay.num_filters = num_matched_filters;
	config.delay.capture_alignment_mixing.downmix = false;
	config.delay.capture_alignment_mixing.adaptive_selection = false;

	for (auto rate : {16000, 32000, 48000}) {
	Block render_block(NumBandsForRate(rate), num_render_channels);
	for (size_t delay_samples : {15, 50, 300, 800}) {
	absl::optional<DelayEstimate> delay_blocks;
	SCOPED_TRACE(ProduceDebugText(rate, delay_samples,
	num_render_channels,
	num_capture_channels));
	std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
	RenderDelayBuffer::Create(config, rate, num_render_channels));
	std::unique_ptr<RenderDelayController> delay_controller(
	RenderDelayController::Create(config, rate,
	num_capture_channels));
	DelayBuffer<float> signal_delay_buffer(delay_samples);
	constexpr size_t kMaxTestJitterBlocks = 26;
	for (size_t j = 0; j < (1000 + delay_samples / kBlockSize) /
	kMaxTestJitterBlocks +
	1;
	++j) {
	std::vector<Block> capture_block_buffer;
	for (size_t k = 0; k < (kMaxTestJitterBlocks - 1); ++k) {
	RandomizeSampleVector(
	&random_generator,
	render_block.View(/band=/0, /channel=/0));
	signal_delay_buffer.Delay(
	render_block.View(/band=/0, /channel=/0),
	capture_block.View(/band=/0, /channel=/0));
	capture_block_buffer.push_back(capture_block);
	render_delay_buffer->Insert(render_block);
	}
	for (size_t k = 0; k < (kMaxTestJitterBlocks - 1); ++k) {
	render_delay_buffer->PrepareCaptureProcessing();
	delay_blocks = delay_controller->GetDelay(
	render_delay_buffer->GetDownsampledRenderBuffer(),
	render_delay_buffer->Delay(), capture_block_buffer[k]);
	}
	}

	constexpr int kDelayHeadroomBlocks = 1;
	size_t expected_delay_blocks =
	std::max(0, static_cast<int>(delay_samples / kBlockSize) -
	kDelayHeadroomBlocks);
	if (expected_delay_blocks < 2) {
	expected_delay_blocks = 0;
	}

	ASSERT_TRUE(delay_blocks);
	EXPECT_EQ(expected_delay_blocks, delay_blocks->delay);
	}
	}
	}
	}
	}
	}
	}

	#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)

	// Verifies the check for correct sample rate.
	// TODO(peah): Re-enable the test once the issue with memory leaks during DEATH
	// tests on test bots has been fixed.
	TEST(RenderDelayControllerDeathTest, DISABLED_WrongSampleRate) {
	for (auto rate : {-1, 0, 8001, 16001}) {
	SCOPED_TRACE(ProduceDebugText(rate));
	EchoCanceller3Config config;
	std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
	RenderDelayBuffer::Create(config, rate, 1));
	EXPECT_DEATH(
	std::unique_ptr<RenderDelayController>(
	RenderDelayController::Create(EchoCanceller3Config(), rate, 1)),
	"");
	}
	}

	#endif

	} // namespace webrtc