Message negociation

Steve Lhomme <[email protected]>
Newsgroups gmane.comp.multimedia.media-api
Message-ID <[email protected]>
I was just think about pointers...

We said that we need messages but that treating them all the time in a 
switch could have an impact on performance.

So what about having a filter ask for a function to the filter it wants 
to send the message. It only has to do this once and then call this 
function instead of sending a message.
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