80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
//////////////////////////////////////////////////////////////////////////
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//
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// preview.h: Manages video preview.
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//
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// 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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//
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//////////////////////////////////////////////////////////////////////////
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#pragma once
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const UINT WM_APP_PREVIEW_ERROR = WM_APP + 1; // wparam = HRESULT
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class CPreview : public IMFSourceReaderCallback
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{
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public:
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static HRESULT CreateInstance(
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HWND hVideo,
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HWND hEvent,
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CPreview **ppPlayer
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);
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// IUnknown methods
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STDMETHODIMP QueryInterface(REFIID iid, void** ppv);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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// IMFSourceReaderCallback methods
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STDMETHODIMP OnReadSample(
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HRESULT hrStatus,
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DWORD dwStreamIndex,
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DWORD dwStreamFlags,
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LONGLONG llTimestamp,
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IMFSample *pSample
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);
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STDMETHODIMP OnEvent(DWORD, IMFMediaEvent *)
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{
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return S_OK;
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}
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STDMETHODIMP OnFlush(DWORD)
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{
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return S_OK;
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}
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HRESULT SetDevice(IMFActivate *pActivate);
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HRESULT CloseDevice();
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HRESULT ResizeVideo(WORD width, WORD height);
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HRESULT CheckDeviceLost(DEV_BROADCAST_HDR *pHdr, BOOL *pbDeviceLost);
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protected:
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// Constructor is private. Use static CreateInstance method to create.
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CPreview(HWND hVideo, HWND hEvent);
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// Destructor is private. Caller should call Release.
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virtual ~CPreview();
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HRESULT Initialize();
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void NotifyError(HRESULT hr) { PostMessage(m_hwndEvent, WM_APP_PREVIEW_ERROR, (WPARAM)hr, 0L); }
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HRESULT TryMediaType(IMFMediaType *pType);
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long m_nRefCount; // Reference count.
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CRITICAL_SECTION m_critsec;
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HWND m_hwndVideo; // Video window.
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HWND m_hwndEvent; // Application window to receive events.
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IMFSourceReader *m_pReader;
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DrawDevice m_draw; // Manages the Direct3D device.
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WCHAR *m_pwszSymbolicLink;
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UINT32 m_cchSymbolicLink;
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}; |