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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_WIN_DEFAULT_AUDIO_DEVICE_CHANGE_DETECTOR_H_
#define REMOTING_HOST_WIN_DEFAULT_AUDIO_DEVICE_CHANGE_DETECTOR_H_
#include <mmdeviceapi.h>
#include <wrl/client.h>
#include "base/synchronization/lock.h"
namespace remoting {
// An IMMNotificationClient implementation to detect the change of the default
// audio output device on the system. It registers itself into the input
// IMMDeviceEnumerator in constructor and unregisters in destructor.
// This class does not use the default ref-counting memory management method
// provided by IUnknown: calling DefaultAudioDeviceChangeDetector::Release()
// won't delete the object.
class DefaultAudioDeviceChangeDetector final : public IMMNotificationClient {
public:
explicit DefaultAudioDeviceChangeDetector(
const Microsoft::WRL::ComPtr<IMMDeviceEnumerator>& enumerator);
~DefaultAudioDeviceChangeDetector();
bool GetAndReset();
private:
// IMMNotificationClient implementation.
HRESULT __stdcall OnDefaultDeviceChanged(EDataFlow flow,
ERole role,
LPCWSTR pwstrDefaultDevice) override;
HRESULT __stdcall QueryInterface(REFIID iid, void** object) override;
// No-ops overrides.
HRESULT __stdcall OnDeviceAdded(LPCWSTR pwstrDeviceId) override;
HRESULT __stdcall OnDeviceRemoved(LPCWSTR pwstrDeviceId) override;
HRESULT __stdcall OnDeviceStateChanged(LPCWSTR pwstrDeviceId,
DWORD dwNewState) override;
HRESULT __stdcall OnPropertyValueChanged(LPCWSTR pwstrDeviceId,
const PROPERTYKEY key) override;
ULONG __stdcall AddRef() override;
ULONG __stdcall Release() override;
const Microsoft::WRL::ComPtr<IMMDeviceEnumerator> enumerator_;
bool changed_ = false;
base::Lock lock_;
};
} // namespace remoting
#endif // REMOTING_HOST_WIN_DEFAULT_AUDIO_DEVICE_CHANGE_DETECTOR_H_
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