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diff --git a/webrtc/modules/audio_processing/agc2/noise_level_estimator.h b/webrtc/modules/audio_processing/agc2/noise_level_estimator.h
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+++ b/webrtc/modules/audio_processing/agc2/noise_level_estimator.h
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+/*
+ *  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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
+#define MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
+
+#include "modules/audio_processing/agc2/signal_classifier.h"
+#include "modules/audio_processing/include/audio_frame_view.h"
+#include "rtc_base/constructor_magic.h"
+
+namespace webrtc {
+class ApmDataDumper;
+
+class NoiseLevelEstimator {
+ public:
+  NoiseLevelEstimator(ApmDataDumper* data_dumper);
+  ~NoiseLevelEstimator();
+  // Returns the estimated noise level in dBFS.
+  float Analyze(const AudioFrameView<const float>& frame);
+
+ private:
+  void Initialize(int sample_rate_hz);
+
+  int sample_rate_hz_;
+  float min_noise_energy_;
+  bool first_update_;
+  float noise_energy_;
+  int noise_energy_hold_counter_;
+  SignalClassifier signal_classifier_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(NoiseLevelEstimator);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_