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+/*
+ *  Copyright (c) 2018 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_ADAPTIVE_MODE_LEVEL_ESTIMATOR_H_
+#define MODULES_AUDIO_PROCESSING_AGC2_ADAPTIVE_MODE_LEVEL_ESTIMATOR_H_
+
+#include <stddef.h>
+#include <type_traits>
+
+#include "modules/audio_processing/agc2/agc2_common.h"
+#include "modules/audio_processing/agc2/saturation_protector.h"
+#include "modules/audio_processing/agc2/vad_with_level.h"
+#include "modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+class ApmDataDumper;
+
+// Level estimator for the digital adaptive gain controller.
+class AdaptiveModeLevelEstimator {
+ public:
+  explicit AdaptiveModeLevelEstimator(ApmDataDumper* apm_data_dumper);
+  AdaptiveModeLevelEstimator(const AdaptiveModeLevelEstimator&) = delete;
+  AdaptiveModeLevelEstimator& operator=(const AdaptiveModeLevelEstimator&) =
+      delete;
+  AdaptiveModeLevelEstimator(
+      ApmDataDumper* apm_data_dumper,
+      AudioProcessing::Config::GainController2::LevelEstimator level_estimator,
+      int adjacent_speech_frames_threshold,
+      float initial_saturation_margin_db,
+      float extra_saturation_margin_db);
+
+  // Updates the level estimation.
+  void Update(const VadLevelAnalyzer::Result& vad_data);
+  // Returns the estimated speech plus noise level.
+  float level_dbfs() const { return level_dbfs_; }
+  // Returns true if the estimator is confident on its current estimate.
+  bool IsConfident() const;
+
+  void Reset();
+
+ private:
+  // Part of the level estimator state used for check-pointing and restore ops.
+  struct LevelEstimatorState {
+    bool operator==(const LevelEstimatorState& s) const;
+    inline bool operator!=(const LevelEstimatorState& s) const {
+      return !(*this == s);
+    }
+    struct Ratio {
+      float numerator;
+      float denominator;
+      float GetRatio() const;
+    };
+    // TODO(crbug.com/webrtc/7494): Remove time_to_full_buffer_ms if redundant.
+    int time_to_full_buffer_ms;
+    Ratio level_dbfs;
+    SaturationProtectorState saturation_protector;
+  };
+  static_assert(std::is_trivially_copyable<LevelEstimatorState>::value, "");
+
+  void ResetLevelEstimatorState(LevelEstimatorState& state) const;
+
+  void DumpDebugData() const;
+
+  ApmDataDumper* const apm_data_dumper_;
+
+  const AudioProcessing::Config::GainController2::LevelEstimator
+      level_estimator_type_;
+  const int adjacent_speech_frames_threshold_;
+  const float initial_saturation_margin_db_;
+  const float extra_saturation_margin_db_;
+  LevelEstimatorState preliminary_state_;
+  LevelEstimatorState reliable_state_;
+  float level_dbfs_;
+  int num_adjacent_speech_frames_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AGC2_ADAPTIVE_MODE_LEVEL_ESTIMATOR_H_