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diff --git a/third_party/libwebrtc/modules/audio_device/win/core_audio_input_win.h b/third_party/libwebrtc/modules/audio_device/win/core_audio_input_win.h
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+++ b/third_party/libwebrtc/modules/audio_device/win/core_audio_input_win.h
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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_DEVICE_WIN_CORE_AUDIO_INPUT_WIN_H_
+#define MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_INPUT_WIN_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/types/optional.h"
+#include "modules/audio_device/win/audio_device_module_win.h"
+#include "modules/audio_device/win/core_audio_base_win.h"
+
+namespace webrtc {
+
+class AudioDeviceBuffer;
+class FineAudioBuffer;
+
+namespace webrtc_win {
+
+// Windows specific AudioInput implementation using a CoreAudioBase class where
+// an input direction is set at construction. Supports capture device handling
+// and streaming of captured audio to a WebRTC client.
+class CoreAudioInput final : public CoreAudioBase, public AudioInput {
+ public:
+  CoreAudioInput(bool automatic_restart);
+  ~CoreAudioInput() override;
+
+  // AudioInput implementation.
+  int Init() override;
+  int Terminate() override;
+  int NumDevices() const override;
+  int SetDevice(int index) override;
+  int SetDevice(AudioDeviceModule::WindowsDeviceType device) override;
+  int DeviceName(int index, std::string* name, std::string* guid) override;
+  void AttachAudioBuffer(AudioDeviceBuffer* audio_buffer) override;
+  bool RecordingIsInitialized() const override;
+  int InitRecording() override;
+  int StartRecording() override;
+  int StopRecording() override;
+  bool Recording() override;
+  int VolumeIsAvailable(bool* available) override;
+  int RestartRecording() override;
+  bool Restarting() const override;
+  int SetSampleRate(uint32_t sample_rate) override;
+
+  CoreAudioInput(const CoreAudioInput&) = delete;
+  CoreAudioInput& operator=(const CoreAudioInput&) = delete;
+
+ private:
+  void ReleaseCOMObjects();
+  bool OnDataCallback(uint64_t device_frequency);
+  bool OnErrorCallback(ErrorType error);
+  absl::optional<int> EstimateLatencyMillis(uint64_t capture_time_100ns);
+  bool HandleStreamDisconnected();
+
+  std::unique_ptr<FineAudioBuffer> fine_audio_buffer_;
+  Microsoft::WRL::ComPtr<IAudioCaptureClient> audio_capture_client_;
+  absl::optional<double> qpc_to_100ns_;
+};
+
+}  // namespace webrtc_win
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_INPUT_WIN_H_