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diff --git a/webrtc/modules/audio_processing/aec3/transparent_mode.h b/webrtc/modules/audio_processing/aec3/transparent_mode.h
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+++ b/webrtc/modules/audio_processing/aec3/transparent_mode.h
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+/*
+ *  Copyright (c) 2020 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_TRANSPARENT_MODE_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_TRANSPARENT_MODE_H_
+
+#include <memory>
+
+#include "api/audio/echo_canceller3_config.h"
+#include "modules/audio_processing/aec3/aec3_common.h"
+
+namespace webrtc {
+
+// Class for detecting and toggling the transparent mode which causes the
+// suppressor to apply less suppression.
+class TransparentMode {
+ public:
+  static std::unique_ptr<TransparentMode> Create(
+      const EchoCanceller3Config& config);
+
+  virtual ~TransparentMode() {}
+
+  // Returns whether the transparent mode should be active.
+  virtual bool Active() const = 0;
+
+  // Resets the state of the detector.
+  virtual void Reset() = 0;
+
+  // Updates the detection decision based on new data.
+  virtual void Update(int filter_delay_blocks,
+                      bool any_filter_consistent,
+                      bool any_filter_converged,
+                      bool all_filters_diverged,
+                      bool active_render,
+                      bool saturated_capture) = 0;
+};
+
+}  // namespace webrtc
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_TRANSPARENT_MODE_H_