[theora] Reading framerate, height, width from Theora file

[G]

I'd like to get basic information about a Theora file using C# .NET. How can
I get started on this?

I know there's oggz-info and other utilities, but I'd like to do this
straight from in .NET. What's the documentation page to find more on this?
Can I just read the first x bytes of the video corresponding to each field?

I found this page which I think is what I need, but I'm not sure.
http://theora.org/doc/libtheora-1.1/group__decfuncs.html
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