capgraph.cpp

一个简单的基于DirectShow的视频捕获程序

/*
HRESULT GetInterfaces(void)
{
    HRESULT hr;

    // Create the filter graph
    hr = CoCreateInstance (CLSID_FilterGraph, NULL, CLSCTX_INPROC,
                           IID_IGraphBuilder, (void **) &g_pGraph);
    if (FAILED(hr))
        return hr;

    // Create the capture graph builder
    hr = CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,
                           IID_ICaptureGraphBuilder2, (void **) &g_pCapture);
    if (FAILED(hr))
        return hr;
    
    // Obtain interfaces for media control and Video Window
    hr = g_pGraph->QueryInterface(IID_IMediaControl,(LPVOID *) &g_pMC);
    if (FAILED(hr))
        return hr;

    hr = g_pGraph->QueryInterface(IID_IVideoWindow, (LPVOID *) &g_pVW);
    if (FAILED(hr))
        return hr;

    hr = g_pGraph->QueryInterface(IID_IMediaEvent, (LPVOID *) &g_pME);
    if (FAILED(hr))
        return hr;

    // Set the window handle used to process graph events
    hr = g_pME->SetNotifyWindow((OAHWND)ghApp, WM_GRAPHNOTIFY, 0);

    return hr;
}
*/