Using custom DShow filters without registering DLLs

If you are creating a media application or utility that requires a DMO or DShow filter but instead of having clunky separate dlls that may need code signing and/or registring with DShow, did you know that you can embed the filter within your main application.

For example for a source filter you can specify a new class and base it on the DShow components you require:

class MySourceFilter : public CSourceStream
{
public:
MySourceFilter( HRESULT* phr, LPCWSTR pName);
virtual ~MySourceFilter(void);
..
..
}

When you create your filtergraph you can use AddFilter to add an instance of your class:


// Create and add new source filter
m_source = new MySourceFilter(NULL, &hr);
hr = m_pGraph->AddFilter((IBaseFilter*)m_source, L"Source");

Simple as that!

You don't need to support the registration or have registry files to allow DShow to find your filter as you've explictly added it yourself.