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Custom filter interfaces

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Recently I was asked this question:

[Paraphrased] I have written a filter, and the filter has only one pin. This pin has some members, which I want to set or get through the filter interface. However, the pin is inherited from CSourceStream and CSourceSeeking. How can I implement an interface for the pin?

This topic has some information about supporting custom interfaces in a filter:

https://msdn2.microsoft.com/en-us/library/ms787698.aspx

Basically, you add DECLARE_IUNKNOWN to you class declaration, and then override CUnknown::NonDelegatingQueryInterface to return a pointer to your interface. The code shown in this topic is for a filter interface, but it's the same principle for pins.

Also, see:

https://msdn2.microsoft.com/en-us/library/ms787849.aspx for information about CUnknown.

The EZRGB24 sample in the SDK shows an example of how to do this at the filter level.

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