Add a Filter by CLSID
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The following function creates a filter with a specified class identifier (CLSID) and adds it to the filter graph:
// Create a filter by CLSID and add it to the graph.
HRESULT AddFilterByCLSID(
IGraphBuilder *pGraph, // Pointer to the Filter Graph Manager.
REFGUID clsid, // CLSID of the filter to create.
IBaseFilter **ppF, // Receives a pointer to the filter.
LPCWSTR wszName // A name for the filter (can be NULL).
)
{
*ppF = 0;
IBaseFilter *pFilter = NULL;
HRESULT hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&pFilter));
if (FAILED(hr))
{
goto done;
}
hr = pGraph->AddFilter(pFilter, wszName);
if (FAILED(hr))
{
goto done;
}
*ppF = pFilter;
(*ppF)->AddRef();
done:
SafeRelease(&pFilter);
return hr;
}
Note
This example uses the SafeRelease function to release the IBaseFilter pointer.
The function calls CoCreateInstance to create the filter, and then calls IFilterGraph::AddFilter to add the filter to the graph. The following code example uses this function to add the AVI Mux filter to the graph:
IBaseFilter *pMux;
hr = AddFilterByCLSID(pGraph, CLSID_AviDest, L"AVI Mux", &pMux, NULL);
if (SUCCEEDED(hr))
{
/* ... */
pMux->Release();
}
Note that some filters cannot be created with CoCreateInstance. This is often the case with filters that manage other software components. For example, the AVI Compressor filter is a wrapper for video codecs, and the WDM Video Capture filter is a wrapper for WDM capture drivers. These filters must be created using either the System Device Enumerator or the Filter Mapper. For more information, see Enumerating Devices and Filters.
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