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diff --git a/webrtc/modules/audio_processing/aec3/nearend_detector.h b/webrtc/modules/audio_processing/aec3/nearend_detector.h
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+/*
+ *  Copyright (c) 2019 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_AEC3_NEAREND_DETECTOR_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_NEAREND_DETECTOR_H_
+
+#include <vector>
+
+#include "api/array_view.h"
+#include "api/audio/echo_canceller3_config.h"
+#include "modules/audio_processing/aec3/aec3_common.h"
+
+namespace webrtc {
+// Class for selecting whether the suppressor is in the nearend or echo state.
+class NearendDetector {
+ public:
+  virtual ~NearendDetector() {}
+
+  // Returns whether the current state is the nearend state.
+  virtual bool IsNearendState() const = 0;
+
+  // Updates the state selection based on latest spectral estimates.
+  virtual void Update(
+      rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+          nearend_spectrum,
+      rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+          residual_echo_spectrum,
+      rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+          comfort_noise_spectrum,
+      bool initial_state) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_NEAREND_DETECTOR_H_