Compensate for the IntelligibilityEnhancer processing delay in high bands

webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h

Index: webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
diff --git a/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h b/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
index b5cc075140ff0bc97ea97b98445ac9e3ab531ab6..5fa53e0bb5f5b002528495524a9c39e2b20944ee 100644
--- a/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
+++ b/webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h
@@ -65,6 +65,20 @@ class GainApplier {
   std::vector<float> current_;
 };
 
+// Helper class to delay a signal by an integer number of samples.
+class DelayBuffer {
+ public:
+  DelayBuffer(size_t delay, size_t num_channels);
+

[peah-webrtc, 2016/09/16 13:35:56]

dd

[aluebs-webrtc, 2016/09/17 00:48:48]

Acknowledged.
https://google.github.io/styleguide/cppguide.html#Vertical_Whitespace

+  ~DelayBuffer();
+

[peah-webrtc, 2016/09/16 13:35:56]

dd

[aluebs-webrtc, 2016/09/17 00:48:48]

Acknowledged.
https://google.github.io/styleguide/cppguide.html#Vertical_Whitespace

+  void Delay(float* const* data, size_t length);
+
+ private:
+  std::vector<std::vector<float>> buffer;
+  size_t read_index;
+};
+
 }  // namespace intelligibility
 
 }  // namespace webrtc