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windowed mode 和 windowless mode
* windowed mode :renderer 创建它自己所属的窗口，简单的说你可以把他当作程序的子窗口。
* windowless mode:renderer 在程序窗口上直接绘图，这并不会创建子窗口
下面介绍windowsless mode的配置
1.创建filter graph manager.
2.创建VMR ,接着添加到过滤图层(filter graph)
3.调用IVMRFilterConfig::SetRenderingMode,参数设置成VMRMode_windowless
4.调用IVMRWindowlessControl::SetVideoClippingWindow,指定程序上的显示句柄(handle)
[CODE]
HRESULT InitWindowlessVMR(
HWND hwndApp, // Window to hold the video.
IGraphBuilder* pGraph, // Pointer to the Filter Graph Manager.
IVMRWindowlessControl** ppWc ) // Receives a pointer to the VMR.
{
if (!pGraph || !ppWc)
{
return E_POINTER;
}
IBaseFilter* pVmr = NULL;
IVMRWindowlessControl* pWc = NULL;
// Create the VMR.
HRESULT hr = CoCreateInstance(CLSID_VideoMixingRenderer, NULL, CLSCTX_INPROC, IID_IBaseFilter, (void**)&pVmr);
if (FAILED(hr))
{
return hr;
}
// Add the VMR to the filter graph.
hr = pGraph->AddFilter(pVmr, L"Video Mixing Renderer");
if (FAILED(hr))
{
pVmr->Release();
return hr;
}
// Set the rendering mode.
IVMRFilterConfig* pConfig;
hr = pVmr->QueryInterface(IID_IVMRFilterConfig, (void**)&pConfig);
if (SUCCEEDED(hr))
{
hr = pConfig->SetRenderingMode(VMRMode_Windowless);
pConfig->Release();
}
if (SUCCEEDED(hr))
{
// Set the window.
hr = pVmr->QueryInterface(IID_IVMRWindowlessControl, (void**)&pWc);
if( SUCCEEDED(hr))
{
hr = pWc->SetVideoClippingWindow(hwndApp);
if (SUCCEEDED(hr))
{
*ppWc = pWc; // Return this as an AddRef'd pointer.
}
else
{
// An error occurred, so release the interface.
pWc->Release();
}
}
}
pVmr->Release();
return hr;
}
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