Media Foundation Presentation Clock?

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Hi there

I'm creating a media foundation sink to process an avi file. I'm trying to modify some source code that comes with the book: Developing Microsoft Media Foundation Applications by Anton Polinger.

I'm am new to windows media foundation.

I'm using a class CAviSink that inherits from :
IMFFinalizableMediaSink, IMFClockStateSink,IMFAsyncCallback

However, I need to set the presentation clock for the sink. I'm not sure how to go about this. I've tried

C#

IMFPresentationClock **ppPresentationClock = NULL;
   
MFCreatePresentationClock(ppPresentationClock);
   
mySink.SetPresentationClock(*ppPresentationClock);

but ppPresentationClock is null.

This is probably the completely wrong way to do this. However, all I can find is very detailed information on the media foundation e.g. what the presentation clock does but no pointers on the basics of how to create one.

I was wondering if someone could give me a pointer to help me find my way through all this confusing docs...

Many thanks...

Posted 12-Apr-13 3:38am

FlurryKnox

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Richard MacCutchan · Accepted Answer · 2013-04-12T05:37:00

Solution 1

You need to understand pointers to pointers in C++. Without seeing the documentation, I suspect your code should read:

C++

IMFPresentationClock *pPresentationClock = NULL;
   
MFCreatePresentationClock(&pPresentationClock);

mySink.SetPresentationClock(*pPresentationClock);
// or maybe even
mySink.SetPresentationClock(pPresentationClock);

Posted 12-Apr-13 5:37am

Richard MacCutchan

Comments

FlurryKnox 13-Apr-13 6:40am

Hi Thanks....that was a silly mistake...Thanks for the hint...

Richard MacCutchan 14-Apr-13 10:29am

One we have all made. :)