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diff --git a/third_party/libwebrtc/api/voip/voip_volume_control.h b/third_party/libwebrtc/api/voip/voip_volume_control.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 API_VOIP_VOIP_VOLUME_CONTROL_H_
+#define API_VOIP_VOIP_VOLUME_CONTROL_H_
+
+#include "api/voip/voip_base.h"
+
+namespace webrtc {
+
+struct VolumeInfo {
+  // https://w3c.github.io/webrtc-stats/#dom-rtcaudiosourcestats-audiolevel
+  double audio_level = 0;
+  // https://w3c.github.io/webrtc-stats/#dom-rtcaudiosourcestats-totalaudioenergy
+  double total_energy = 0.0;
+  // https://w3c.github.io/webrtc-stats/#dom-rtcaudiosourcestats-totalsamplesduration
+  double total_duration = 0.0;
+};
+
+// VoipVolumeControl interface.
+//
+// This sub-API supports functions related to the input (microphone) and output
+// (speaker) device.
+//
+// Caller must ensure that ChannelId is valid otherwise it will result in no-op
+// with error logging.
+class VoipVolumeControl {
+ public:
+  // Mute/unmutes the microphone input sample before encoding process. Note that
+  // mute doesn't affect audio input level and energy values as input sample is
+  // silenced after the measurement.
+  // Returns following VoipResult;
+  //  kOk - input source muted or unmuted as provided by `enable`.
+  //  kInvalidArgument - `channel_id` is invalid.
+  virtual VoipResult SetInputMuted(ChannelId channel_id, bool enable) = 0;
+
+  // Gets the microphone volume info via `volume_info` reference.
+  // Returns following VoipResult;
+  //  kOk - successfully set provided input volume info.
+  //  kInvalidArgument - `channel_id` is invalid.
+  virtual VoipResult GetInputVolumeInfo(ChannelId channel_id,
+                                        VolumeInfo& volume_info) = 0;
+
+  // Gets the speaker volume info via `volume_info` reference.
+  // Returns following VoipResult;
+  //  kOk - successfully set provided output volume info.
+  //  kInvalidArgument - `channel_id` is invalid.
+  virtual VoipResult GetOutputVolumeInfo(ChannelId channel_id,
+                                         VolumeInfo& volume_info) = 0;
+
+ protected:
+  virtual ~VoipVolumeControl() = default;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VOIP_VOIP_VOLUME_CONTROL_H_