56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved
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#pragma once
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class CVolumeMonitor : IMMNotificationClient, IAudioEndpointVolumeCallback
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{
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private:
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BOOL m_bRegisteredForEndpointNotifications;
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BOOL m_bRegisteredForVolumeNotifications;
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CComPtr<IMMDeviceEnumerator> m_spEnumerator;
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CComPtr<IMMDevice> m_spAudioEndpoint;
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CComPtr<IAudioEndpointVolume> m_spVolumeControl;
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CCriticalSection m_csEndpoint;
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long m_cRef;
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~CVolumeMonitor(); // refcounted object... make the destructor private
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HRESULT AttachToDefaultEndpoint();
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void DetachFromEndpoint();
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// IMMNotificationClient (only need to really implement OnDefaultDeviceChanged)
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IFACEMETHODIMP OnDeviceStateChanged(LPCWSTR /*pwstrDeviceId*/, DWORD /*dwNewState*/) { return S_OK; }
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IFACEMETHODIMP OnDeviceAdded(LPCWSTR /*pwstrDeviceId*/) { return S_OK; }
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IFACEMETHODIMP OnDeviceRemoved(LPCWSTR /*pwstrDeviceId*/) { return S_OK; }
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IFACEMETHODIMP OnDefaultDeviceChanged(EDataFlow flow, ERole role, LPCWSTR pwstrDefaultDeviceId); // ****
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IFACEMETHODIMP OnPropertyValueChanged(LPCWSTR /*pwstrDeviceId*/, const PROPERTYKEY /*key*/) { return S_OK; }
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IFACEMETHODIMP OnDeviceQueryRemove() { return S_OK; }
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IFACEMETHODIMP OnDeviceQueryRemoveFailed() { return S_OK; }
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IFACEMETHODIMP OnDeviceRemovePending() { return S_OK; }
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// IAudioEndpointVolumeCallback
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IFACEMETHODIMP OnNotify(PAUDIO_VOLUME_NOTIFICATION_DATA pNotify);
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// IUnknown
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IFACEMETHODIMP QueryInterface(const IID& iid, void** ppUnk);
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public:
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CVolumeMonitor();
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HRESULT Initialize();
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void Dispose();
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HRESULT GetLevelInfo(VOLUME_INFO* pInfo);
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void ChangeEndpoint();
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// IUnknown
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IFACEMETHODIMP_(ULONG) AddRef();
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IFACEMETHODIMP_(ULONG) Release();
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};
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