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//////////////////////////////////////////////////////////////////////////
//
// preview.h: Manages video preview.
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//////////////////////////////////////////////////////////////////////////
#pragma once
#include <cstdio>
const UINT WM_APP_PREVIEW_ERROR = WM_APP + 1; // wparam = HRESULT
class CPreview : public IMFSourceReaderCallback
{
public:
static HRESULT CreateInstance(
HWND hVideo,
HWND hEvent,
CPreview **ppPlayer
);
// IUnknown methods
STDMETHODIMP QueryInterface(REFIID iid, void** ppv);
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
// IMFSourceReaderCallback methods
STDMETHODIMP OnReadSample(
HRESULT hrStatus,
DWORD dwStreamIndex,
DWORD dwStreamFlags,
LONGLONG llTimestamp,
IMFSample *pSample
);
STDMETHODIMP OnEvent(DWORD, IMFMediaEvent *)
{
return S_OK;
}
STDMETHODIMP OnFlush(DWORD)
{
return S_OK;
}
HRESULT SetDevice(IMFActivate *pActivate, int formatType);
HRESULT CloseDevice();
HRESULT ResizeVideo(WORD width, WORD height);
HRESULT CheckDeviceLost(DEV_BROADCAST_HDR *pHdr, BOOL *pbDeviceLost);
HRESULT EnumerateCaptureFormats(IMFMediaType ***pppTypes, UINT32 *pcCount);
HRESULT SetFormat(IMFMediaType *pActivate);
bool ToggleVideo();
bool ToggleTransform();
bool ToggleMoyen();
protected:
bool m_video;
bool m_transform;
bool m_moyen;
// Constructor is private. Use static CreateInstance method to create.
CPreview(HWND hVideo, HWND hEvent);
// Destructor is private. Caller should call Release.
virtual ~CPreview();
HRESULT Initialize();
void NotifyError(HRESULT hr) { PostMessage(m_hwndEvent, WM_APP_PREVIEW_ERROR, (WPARAM)hr, 0L); }
HRESULT TryMediaType(IMFMediaType *pType);
long m_nRefCount; // Reference count.
CRITICAL_SECTION m_critsec;
HWND m_hwndVideo; // Video window.
HWND m_hwndEvent; // Application window to receive events.
IMFSourceReader *m_pReader;
IMFMediaSource *m_pSource;
DrawDevice m_draw; // Manages the Direct3D device.
WCHAR *m_pwszSymbolicLink;
UINT32 m_cchSymbolicLink;
};
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