Pull the Voice Activity Detector out from the AGC

webrtc/modules/audio_processing/vad/pitch_based_vad.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AGC_PITCH_BASED_VAD_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_PITCH_BASED_VAD_H_
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
 
 #include "webrtc/base/scoped_ptr.h"
-#include "webrtc/modules/audio_processing/agc/common.h"
-#include "webrtc/modules/audio_processing/agc/gmm.h"
+#include "webrtc/modules/audio_processing/vad/common.h"
+#include "webrtc/modules/audio_processing/vad/gmm.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class AudioFrame;
-class AgcCircularBuffer;
+class VadCircularBuffer;
 
 // Computes the probability of the input audio frame to be active given
 // the corresponding pitch-gain and lag of the frame.
 class PitchBasedVad {
  public:
   PitchBasedVad();
   ~PitchBasedVad();
 
   // Compute pitch-based voicing probability, given the features.
   //   features: a structure containing features required for computing voicing
   //             probabilities.
   //
   //   p_combined: an array which contains the combined activity probabilities
   //               computed prior to the call of this function. The method,
   //               then, computes the voicing probabilities and combine them
   //               with the given values. The result are returned in |p|.
   int VoicingProbability(const AudioFeatures& features, double* p_combined);
+
  private:
   int UpdatePrior(double p);
 
   // TODO(turajs): maybe defining this at a higher level (maybe enum) so that
   // all the code recognize it as "no-error."
   static const int kNoError = 0;
 
   GmmParameters noise_gmm_;
   GmmParameters voice_gmm_;
 
   double p_prior_;
 
-  rtc::scoped_ptr<AgcCircularBuffer> circular_buffer_;
+  rtc::scoped_ptr<VadCircularBuffer> circular_buffer_;
 };
 
 }  // namespace webrtc
-#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_PITCH_BASED_VAD_H_
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_