directshow 之 视频无窗口浏览

HRESULT CVideoSource::AddWindowLessRender( HWND hwndApp, RECT win_rect) // Window to hold the video.
{

HRESULT hr = NULL;
CRect rcSrc, rcDest;
hr=CoCreateInstance(CLSID_VideoMixingRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&m_pVideoRender);
if(hr!=S_OK)return hr;
// Create the VMR.

// Add the VMR to the filter graph.
hr = m_pGrapher->AddFilter(m_pVideoRender, L"Video Mixing Renderer");
if (FAILED(hr))
{
m_pVideoRender->Release();
return hr;
}
// Set the rendering mode.
long lWidth, lHeight, lARWidth, lARHeight;
hr = m_pVideoRender->QueryInterface(IID_IVMRFilterConfig, (void**)&m_pFilterConfig);
if (FAILED(hr))
{
m_pVideoRender->Release();
return hr;
}

hr = m_pFilterConfig->SetRenderingMode(VMRMode_Windowless); //
if (FAILED(hr))
{
m_pVideoRender->Release();
return hr;
}

// Set the window.
hr = m_pVideoRender->QueryInterface(IID_IVMRWindowlessControl, (void**)&m_pWindowsLessControl);
if (FAILED(hr))
{
m_pVideoRender->Release();
return hr;
}
if (m_bSetVedioFormat) //当进行视频调整时，进行格式设置
{
hr = UpdateVideoCapConfig();
m_bSetVedioFormat = false; //视频格式调整结束，开关置为原位
}
//RenderStream();
IPin *pPin2;
hr = m_pBuilder->FindPin(m_pSmartTee, PINDIR_OUTPUT, 0, 0, TRUE, 1, &pPin2);
hr = m_pBuilder->RenderStream(0, 0, pPin2, 0, m_pVideoRender);
//hr = m_pBuilder->RenderStream(0, 0, m_pSmartTee, 0, m_pVideoRender);

//hr=m_pBuilder->RenderStream(
// &PIN_CATEGORY_PREVIEW, //&PIN_CATEGORY_CAPTURE, // Pin category
// &MEDIATYPE_Video, // Media type
// m_pSmartTee, //m_pVideoCap, // Capture filter
// NULL, //m_pVidCompress, // Compression filter (optional)
// m_pVideoRender // Multiplexer or renderer filter
// );
hr = m_pWindowsLessControl->SetVideoClippingWindow(hwndApp);
hr = m_pWindowsLessControl->GetNativeVideoSize(&lWidth, &lHeight,NULL,NULL);
if (FAILED(hr))
{
m_pVideoRender->Release();
return hr;
}
// Set the source rectangle.
SetRect(&rcSrc, 0, 0, lWidth, lHeight);

// Get the window client area.
GetClientRect(hwndApp, &rcDest);
// Set the destination rectangle.
SetRect(&rcDest, 10, 10, win_rect.right, win_rect.bottom);
//SetRect(&rcDest, 0, 0, rcDest.right, rcDest.bottom);

hr = m_pWindowsLessControl->SetVideoPosition(&rcSrc, &rcDest);
// make sure we process events while we're previewing!
hr = m_pGrapher->QueryInterface(IID_IMediaEventEx, (void **)&m_pMediaEventEx);
if(hr == NOERROR)
{
m_pMediaEventEx->SetNotifyWindow((OAHWND)hwndApp, WM_FGNOTIFY, 0);
}
return hr;
}