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OpenGL Directshow, animation and callbacks

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I have frames of an animation in memory. I want to output them to a Decklink Digital Video output card. The only way into this card is via a Directshow filter. I have been experimenting with the PushSourceBitmapSet Filter and can succesfully output frames to the card from the animation after saving them to disk. My application creates the frames in OpenGL. I want to extend the application to create a graph and then pass the images to the graph. I know how to create a graph. But I am stuck trying to understand the steps necessary to get the frames from memory directly into a directshow graph. Does this involve the use of callbacks? If so does anyone have any clues on how to do it? I haven't found any examples out there for this. Thanks

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