New module for the adaptive level controlling functionality in the audio processing module

webrtc/modules/audio_processing/level_controller/lc_constants.h

 /*
  *  Copyright (c) 2016 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.
  */
 
-#include "webrtc/modules/audio_coding/neteq/packet.h"
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_LC_CONSTANTS_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_LC_CONSTANTS_H_
 
 namespace webrtc {
 
-Packet::Packet() = default;
-
-Packet::~Packet() = default;
+const float kMaxLcGain = 45;
+const float kMaxLcNoisePower = 200.f * 200.f;
+const float kTargetLcPeakLevel = 0.8f * 32767.f;
 
 }  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_LC_CONSTANTS_H_