Pull the Voice Activity Detector out from the AGC

webrtc/modules/audio_processing/agc/agc_manager_direct.cc

 /*
  *  Copyright (c) 2013 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.
  */
 
@@ skipping 303 matching lines @@
   }
   capture_muted_ = muted;
 
   if (!muted) {
     // When we unmute, we should reset things to be safe.
     check_volume_on_next_process_ = true;
   }
 }
 
 float AgcManagerDirect::voice_probability() {
-  return static_cast<float>(agc_->voice_probability());
+  return agc_->voice_probability();
 }
 
 int AgcManagerDirect::CheckVolumeAndReset() {
   int level = volume_callbacks_->GetMicVolume();
   if (level < 0) {
     return -1;
   }
   // Reasons for taking action at startup:
   // 1) A person starting a call is expected to be heard.
   // 2) Independent of interpretation of |level| == 0 we should raise it so the
@@ skipping 98 matching lines @@
   if (new_compression != compression_) {
     compression_ = new_compression;
     compression_accumulator_ = new_compression;
     if (gctrl_->set_compression_gain_db(compression_) != 0) {
       LOG_FERR1(LS_ERROR, set_compression_gain_db, compression_);
     }
   }
 }
 
 }  // namespace webrtc