Knowledge Base Nr: 00194 VideoSupport.cpp - http://www.swe-kaiser.de

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Win32: Video for Windows (VfW) Unterstützung
(u.a. Grabben und als JPG speichern)

  
#include <vfw.h>

enum VS_MODE { VS_NONE,
               VS_768x576, VS_384x288, VS_192x144,  //Hauppauge WinTV Go
               VS_640x480, VS_352x288, VS_320x240, VS_176x144, VS_160x120, VS_128x96,  //DEXXA WebCam
               VS_ILLEGAL
             };

class CVideoSupport
{
public:
    CVideoSupport();
    virtual ~CVideoSupport();

    const char* GetLastError();
    void SetDebug(bool bDebug) { m_bDebug = bDebug; }

    int Init(CWnd* pWnd, int nDeviceIndex = 0, BOOL bVisible = TRUE, BOOL bPreview = FALSE);
    int Exit();

    int RecordAVIStart(const char* lpszFilename);
    int RecordAVIAddFrame();
    int RecordAVIEnd();

    int DoOverlay(BOOL bDo);
    int DoPreview(BOOL bDo);
    int DoStopDisplay();

    //interface zu videoserver
    //source: 0:tv 1:composite
    static int ServerOnOff(bool bOn, VS_MODE eMode, int nSource);
    static int GetServerPicture(CString* pstrFilename);
    static int GetServerPicture(CImageSupport* pImage);

    int InfoDialog();
    int DoSettings();
    int SetFrameSize(VS_MODE eMode);

    int SetVideoSource(const char* szKeys);
    int SetVideoFormat(const char* szKeys);

    //ein hash als letztes zeichen in lpszFileName blendet setup-dialoge ein
    int GrabFrame(const char* lpszFilename, BOOL bStop = FALSE);
    int GrabAndSaveSingleFrame(CWnd* pWnd, BOOL bVisible, BOOL bPreview
                             , char* szFileName, VS_MODE eMode);

    CImageSupport* GetImage() { return &s_image; }

protected:
    static HWND s_hWndC;

    static CString s_strJPGfile;
    static CImageSupport s_image;
    static bool volatile s_bGrabbed;

    CString m_strLastError;
    bool m_bDebug;

    static CString s_strSetupDlg;
    static LRESULT PASCAL FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr);

    static DWORD WINAPI SetupDialog(LPVOID lpParameter);
    void WaitForInputIdle();
};