Smooth BWE and pass it to Audio Network Adaptor.

webrtc/base/smoothing_filter.cc

Index: webrtc/base/smoothing_filter.cc
diff --git a/webrtc/base/smoothing_filter.cc b/webrtc/base/smoothing_filter.cc
index e26129fd6d9bc1300cf170d2a41d147b29d398e6..6b5d0811dd59bdc27d9a87dbc475bb47365fda22 100644
--- a/webrtc/base/smoothing_filter.cc
+++ b/webrtc/base/smoothing_filter.cc
@@ -59,4 +59,9 @@ rtc::Optional<float> SmoothingFilterImpl::GetAverage() const {
                                                   : rtc::Optional<float>(value);
 }
 
+void SmoothingFilterImpl::SetTimeConstantMs(int time_constant_ms) {
+  time_constant_ms_ = time_constant_ms;
+  filter_.UpdateBase(exp(1.0f / time_constant_ms_));

[minyue-webrtc, 2016/11/21 09:18:24]

is this needed. Don't we always decide to updateBase in AddSample?

[michaelt, 2016/11/21 09:48:32]

Just in the case the filter is not initialized.

[minyue-webrtc, 2016/11/21 10:59:01]

I see... BTW, you mean "it IS initialized" don't you?

+}
+
 }  // namespace webrtc