how to get the media info using Direct show?

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C++

Win32

directshow

VisualC++

I am creating the video player using directshow. And am using mp4 and avi containers. Am playing the video with predifined filters according to the containers. And i need to create the predefined filters according to the format of the video because the same container having different formats. EX: Avi Container having (DV, MPEG-4,..).
This is my predefined filters according to the container:
1.MP4[AVC format]
LAVSplitterSource->FFDShowVideoDecoder->VMR9

2.AVI[DV Format]
FileSource->AVISplitter->DVFormat->FFDShowVideoDecoder->VMR9

3.AVI[MPEG4-visual Format]
FileSource->AVIsplitter->FFDShowVideoDecoder->VMR9

After or before creating the Source filter i need to know the format so that i can create the down stream filters according to that.

It will be very useful if anyone help me to get this.

Thanks & regards,
J.Surjith Kumar