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[Ross Finlayson]

>Here doGetNextFrame(), the first time, it calls
>MPEG2TransportStreamFramer::doGetNextFrame(), the
>second time, it calls
>"ByteStreamFileSource::doGetNextFrame()",

That's correct, because "doGetNextFrame()" is being called *on different 
objects* in each case.

>I am wondering, which parameter tells this
>doGetNextFrame() function in
>FramedSource::getNextFrame() to choose different
>virtual function implemented in class
>MPEG2TransportStreamFramer and class
>ByteStreamFileSource respectively?

It's the object (to the left of the "->") that determines this.

It sounds like you don't yet fully unserstand how C++ virtual functions 
(for example, "FramedSource::doGetNextFrame()") work.  I suggest that 
review this.

(Unfortunately, basic C++ tutorials are generally off-topic for this 
mailing list.)


	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>