text: /*
   *  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/residual_echo_estimator.h"
  
  #include "api/audio/echo_canceller3_config.h"
  #include "modules/audio_processing/aec3/aec3_fft.h"
  #include "modules/audio_processing/aec3/aec_state.h"
  #include "modules/audio_processing/aec3/render_delay_buffer.h"
  #include "modules/audio_processing/test/echo_canceller_test_tools.h"
  #include "rtc_base/random.h"
  #include "test/gtest.h"
  
  namespace webrtc {
  
  #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
  
  // Verifies that the check for non-null output residual echo power works.
  TEST(ResidualEchoEstimator, NullResidualEchoPowerOutput) {
    EchoCanceller3Config config;
    AecState aec_state(config);
    std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
        RenderDelayBuffer::Create(config, 3));
    std::vector<std::array<float, kFftLengthBy2Plus1>> H2;
    std::array<float, kFftLengthBy2Plus1> S2_linear;
    std::array<float, kFftLengthBy2Plus1> Y2;
    EXPECT_DEATH(ResidualEchoEstimator(EchoCanceller3Config{})
                     .Estimate(aec_state, *render_delay_buffer->GetRenderBuffer(),
                               S2_linear, Y2, nullptr),
                 "");
  }
  
  #endif
  
  // TODO(peah): This test is broken in the sense that it not at all tests what it
  // seems to test. Enable the test once that is adressed.
  TEST(ResidualEchoEstimator, DISABLED_BasicTest) {
    EchoCanceller3Config config;
    config.ep_strength.default_len = 0.f;
    config.delay.min_echo_path_delay_blocks = 0;
    ResidualEchoEstimator estimator(config);
    AecState aec_state(config);
    std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
        RenderDelayBuffer::Create(config, 3));
  
    std::array<float, kFftLengthBy2Plus1> E2_main;
    std::array<float, kFftLengthBy2Plus1> E2_shadow;
    std::array<float, kFftLengthBy2Plus1> S2_linear;
    std::array<float, kFftLengthBy2Plus1> S2_fallback;
    std::array<float, kFftLengthBy2Plus1> Y2;
    std::array<float, kFftLengthBy2Plus1> R2;
    EchoPathVariability echo_path_variability(
        false, EchoPathVariability::DelayAdjustment::kNone, false);
    std::vector<std::vector<float>> x(3, std::vector<float>(kBlockSize, 0.f));
    std::vector<std::array<float, kFftLengthBy2Plus1>> H2(10);
    Random random_generator(42U);
    std::array<float, kBlockSize> s;
    Aec3Fft fft;
    rtc::Optional<DelayEstimate> delay_estimate;
  
    for (auto& H2_k : H2) {
      H2_k.fill(0.01f);
    }
    H2[2].fill(10.f);
    H2[2][0] = 0.1f;
  
    std::vector<float> h(GetTimeDomainLength(config.filter.main.length_blocks),
                         0.f);
  
    s.fill(100.f);
  
    constexpr float kLevel = 10.f;
    E2_shadow.fill(kLevel);
    E2_main.fill(kLevel);
    S2_linear.fill(kLevel);
    S2_fallback.fill(kLevel);
    Y2.fill(kLevel);
  
    for (int k = 0; k < 1993; ++k) {
      RandomizeSampleVector(&random_generator, x[0]);
      std::for_each(x[0].begin(), x[0].end(), [](float& a) { a /= 30.f; });
      render_delay_buffer->Insert(x);
      if (k == 0) {
        render_delay_buffer->Reset();
      }
      render_delay_buffer->PrepareCaptureProcessing();
  
      aec_state.HandleEchoPathChange(echo_path_variability);
      aec_state.Update(delay_estimate, H2, h, true,
                       *render_delay_buffer->GetRenderBuffer(), E2_main, Y2, s,
                       false);
  
      estimator.Estimate(aec_state, *render_delay_buffer->GetRenderBuffer(),
                         S2_linear, Y2, &R2);
    }
    std::for_each(R2.begin(), R2.end(),
                  [&](float a) { EXPECT_NEAR(kLevel, a, 0.1f); });
  }
  
  }  // namespace webrtc
  