Further tuning for AEC3 for initial echo suppression and handling of echo path changes

webrtc/modules/audio_processing/aec3/aec_state.cc

Index: webrtc/modules/audio_processing/aec3/aec_state.cc
diff --git a/webrtc/modules/audio_processing/aec3/aec_state.cc b/webrtc/modules/audio_processing/aec3/aec_state.cc
index c18fd6d8709e9c8075ebade9ad8d67f26350210c..e43cfc4795d11230d2e103d6de398ba28c6b7b2d 100644
--- a/webrtc/modules/audio_processing/aec3/aec_state.cc
+++ b/webrtc/modules/audio_processing/aec3/aec_state.cc
@@ -81,7 +81,7 @@ void AnalyzeFilter(
 constexpr int kActiveRenderCounterInitial = 50;
 constexpr int kActiveRenderCounterMax = 200;
 constexpr int kEchoPathChangeCounterInitial = 50;
-constexpr int kEchoPathChangeCounterMax = 200;
+constexpr int kEchoPathChangeCounterMax = 3 * 250;
 
 }  // namespace
 
@@ -120,6 +120,9 @@ void AecState::Update(const std::vector<std::array<float, kFftLengthBy2Plus1>>&
 
   const float x_energy = std::inner_product(x.begin(), x.end(), x.begin(), 0.f);
 
+  active_render_blocks_ =
+      echo_path_variability.AudioPathChanged() ? 0 : active_render_blocks_ + 1;
+
   echo_path_change_counter_ = echo_path_variability.AudioPathChanged()
                                   ? kEchoPathChangeCounterMax
                                   : echo_path_change_counter_ - 1;