Convert IntelligibilityEnhancer to multi-threaded mode

webrtc/modules/audio_processing/include/audio_processing.h

Index: webrtc/modules/audio_processing/include/audio_processing.h
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index 8af5f53e1eb99135072b5592e48694e102587797..04c3347bf7adcbd57ad6cc4c1baf83805c7d03b1 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -929,6 +929,9 @@ class NoiseSuppression {
   // Returns the noise estimate per frequency bin averaged over all channels.
   virtual std::vector<float> NoiseEstimate() = 0;
 
+  // Returns the number of bins of the noise estimate.
+  virtual size_t num_noise_bins() const = 0;

[peah-webrtc, 2016/03/08 07:02:38]

I don't think we should put methods in here unless absolutely necessary. This
API is part of the public APM API, which means that anything that is put here
may be used outside of APM. We are trying to remove the submodule public API as
it is very hard to maintain.

This method could instead be put into NoiseSuppressionImpl as it is only used
within APM, right? In that way it will not be publicly visible outside of APM.

[hlundin-webrtc, 2016/03/08 10:28:48]

Acknowledged.

[aluebs-webrtc, 2016/03/08 10:53:00]

Good point. Done.

+
  protected:
   virtual ~NoiseSuppression() {}
 };