Transparency improvements in the echo canceller 3

webrtc/modules/audio_processing/aec3/main_filter_update_gain_unittest.cc

Index: webrtc/modules/audio_processing/aec3/main_filter_update_gain_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/main_filter_update_gain_unittest.cc b/webrtc/modules/audio_processing/aec3/main_filter_update_gain_unittest.cc
index fc33e12a6c7f33d06d8ec1add73e1bf0a1bea20b..6e8a80b532a95090eb0a4f0b0c356962198cecc8 100644
--- a/webrtc/modules/audio_processing/aec3/main_filter_update_gain_unittest.cc
+++ b/webrtc/modules/audio_processing/aec3/main_filter_update_gain_unittest.cc
@@ -55,7 +55,8 @@ void RunFilterUpdateTest(int num_blocks_to_process,
   std::vector<float> y(kBlockSize, 0.f);
   AecState aec_state(0.f);
   RenderSignalAnalyzer render_signal_analyzer;
-  std::array<float, kFftLength> s;
+  std::array<float, kFftLength> s_scratch;
+  std::array<float, kBlockSize> s;
   FftData S;
   FftData G;
   SubtractorOutput output;
@@ -96,18 +97,21 @@ void RunFilterUpdateTest(int num_blocks_to_process,
 
     // Apply the main filter.
     main_filter.Filter(render_buffer, &S);
-    fft.Ifft(S, &s);
-    std::transform(y.begin(), y.end(), s.begin() + kFftLengthBy2,
+    fft.Ifft(S, &s_scratch);
+    std::transform(y.begin(), y.end(), s_scratch.begin() + kFftLengthBy2,
                    e_main.begin(),
                    [&](float a, float b) { return a - b * kScale; });
     std::for_each(e_main.begin(), e_main.end(),
                   [](float& a) { a = rtc::SafeClamp(a, -32768.f, 32767.f); });
     fft.ZeroPaddedFft(e_main, &E_main);
+    for (size_t k = 0; k < kBlockSize; ++k) {
+      s[k] = kScale * s_scratch[k + kFftLengthBy2];
+    }
 
     // Apply the shadow filter.
     shadow_filter.Filter(render_buffer, &S);
-    fft.Ifft(S, &s);
-    std::transform(y.begin(), y.end(), s.begin() + kFftLengthBy2,
+    fft.Ifft(S, &s_scratch);
+    std::transform(y.begin(), y.end(), s_scratch.begin() + kFftLengthBy2,
                    e_shadow.begin(),
                    [&](float a, float b) { return a - b * kScale; });
     std::for_each(e_shadow.begin(), e_shadow.end(),
@@ -131,8 +135,9 @@ void RunFilterUpdateTest(int num_blocks_to_process,
     // Update the delay.
     aec_state.HandleEchoPathChange(EchoPathVariability(false, false));
     aec_state.Update(main_filter.FilterFrequencyResponse(),
+                     main_filter.FilterImpulseResponse(),
                      rtc::Optional<size_t>(), render_buffer, E2_main, Y2, x[0],
-                     false);
+                     s, false);
   }
 
   std::copy(e_main.begin(), e_main.end(), e_last_block->begin());