Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/decimator_by_4.h

Index: webrtc/modules/audio_processing/aec3/decimator_by_4.h
diff --git a/webrtc/modules/audio_processing/aec3/decimator_by_4.h b/webrtc/modules/audio_processing/aec3/decimator_by_4.h
index 9a22dfcfed84c9f1e3b53bd8a95ce44d267817c9..5afc68118b7b7c01965b67e2e3ec37b8f77397c0 100644
--- a/webrtc/modules/audio_processing/aec3/decimator_by_4.h
+++ b/webrtc/modules/audio_processing/aec3/decimator_by_4.h
@@ -26,8 +26,7 @@ class DecimatorBy4 {
   DecimatorBy4();
 
   // Downsamples the signal.
-  void Decimate(rtc::ArrayView<const float> in,
-                std::array<float, kSubBlockSize>* out);
+  void Decimate(rtc::ArrayView<const float> in, rtc::ArrayView<float> out);

[peah-webrtc, 2017/03/30 05:36:55]

This is needed due to that now multi-band render blocks are processed in the
render pipeline. I expect this to be changed back once the multi-band blocks are
changed from being vectors of vectors.

 
  private:
   CascadedBiQuadFilter low_pass_filter_;