AddRef pUnk in CopyMediaType.
Added CreateMediaType helper function and use it.
Replaced some DeleteMediaType calls to FreeMediaType to be in line
with recent changes.
Fixed IEnumMediaTypesImpl_Next.
Clear media type when initializing pins.
Added some AddRef/Release traces.
variables on creation of graph.
- Remove clue of where I copied one of the copyright messages from.
- Add implementation of input and output pins which will be used by a
lot of filters in Quartz.