Video decoding using codec installed in windows

[Fe++]

Hi,
I want to ask any information about how windows media player and other MS-system media player decode mpeg stream using the codec installed in the system. I'm usually to use libavcodec api of ffmpeg in not-MS world, but now i necessarily use dynamic binding to codecs installed in the OS(if is possible). There is any standard api that I can use for access at this codec? There is any open source project that i can use as reference that use that video codec call design? If you know also any resource that can help me it's very appreciated. Many Thanks.
Best Regards

[talen9]

DirectShow API (http://en.wikipedia.org/wiki/DirectShow)

[Fe++]

Thanks, for manipulate frame i have to implement a transform filter using .net framework. Many thanks.

[Midzuki]

No, you don't have to use the dot NET framework.
DirectShow is a couple of years older than the "wannabe Java" from Microsoft. :devil:

[JonE]

Whilst I believe it is possible to write a transform filter in .NET it really isn't to be recommended (refer comments by various MVPs in the Microsoft Microsoft DirectX Video newsgroup (http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.win32.programmer.directx.video&lang=en&cr=US)). Nothing to do with C++ vs .NET personal prefferences, rather DirectShow uses C++ and it is way easier to implement the stuff in the native language.

Using the transform filter in a graph is a different matter thanks to the group responsible for the DirectShow.Net library (http://directshownet.sourceforge.net/) which sorts out all the scary .NET interop that would be required.

TTFN,
Jon