视频捕捉问题：

[kingcaiyao]

从www.vckbase代码仓库中有一个vcap的视频捕捉程序。可以对PC机上安装的摄像头拍摄到的视频画面进行捕捉并播放。我想询问的是视频摄像头输出的数据到底是什么格式的？输出的到底是什么数据？如何得到这些数据呢？在vcap程序中只是创建了一个视频窗口,capCreateWindow和capPreview进行播放，但问题是用capPreview进行播放之前到底是什么数据呢？欢迎大家讨论。

[vcmute]

视频摄像头输出的数据到底是什么格式的
一般是未压缩的，如YUV系列如I420,UYVY等和RGB系列如RGB16/24/32等，具体可设置

[vcmute]

sdk sample中有个AMCAP例子

[xuzheng318]

BOOL CCapTestDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMeenu);
}

}
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon



// TODO: Add extra initialization here
gpJpegFile = new JpegFile(); //initializate gpJpegFile;
ghDlg = AfxGetMainWnd()->GetSafeHwnd (); //init ghDlg for callback pro

CWnd* pWnd=AfxGetMainWnd()->GetDlgItem (IDC_PICT); //GET the capture wi
do
w's father windows

CRect rect;
pWnd->GetWindowRect (&rect); //get rect.
ghCapWnd= capCreateCaptureWindow((LPTSTR)"MYCAP",WS_VISIBLE|WS_CHILD
|WS_EX_DLGMODALFRAME,0,0,rect.Width(),rect.Height(),
pWnd->GetSafeHwnd(),0); //create capture window
ASSERT(ghCapWnd);
if(capDriverConnect(ghCapWnd,0)){ //connect to Driver
capDriverGetCaps(ghCapWnd,&gCapDrvCaps,sizeof(CAPDRIVERCAPS)); /
Get statu
s
if(gCapDrvCaps.fCaptureInitialized){


capPreviewRate(ghCapWnd,33);
capPreview(ghCapWnd,TRUE);
capGetVideoFormat(ghCapWnd,&_bmpInfo,(WORD)sizeof(_bmpIn
o));
capSetCallbackOnFrame(ghCapWnd,FrameCallbackProc);
capSetCallbackOnStatus(ghCapWnd,StatusCallbackProc);
}
else {
AfxMessageBox("²¶»ñ¿¨³õʼ»¯Ê§°Ü");
AfxGetMainWnd()->PostMessage (WM_CLOSE);
}
}
else {
AfxMessageBox("²¶»ñ¿¨Á¬½Óʧ°Ü");
AfxGetMainWnd()->PostMessage (WM_CLOSE);
}
return TRUE; // return TRUE unless you set the focus to a control
}
void CCapTestDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

[xuzheng318]

http://www.naughter.com/download/vfwwnd.zip

[sboom]

用第三方库扑捉，我用OPENCV

[cx0928]

用DirectSHow

[dongfa]

主要是摄像头支持哪些格式了,可以通过方法来枚举和设置的.