loadAsync() Windows DirectShowPlayer

Hi,

I've been wanting to use the loadAsync function under Windows and arturo let me know it's not yet implemented. using ofxGSteamer is an alternative, though pulling in more dependencies is sometimes not making things easier, but it works great.

I'm dropping here some infos regarding this here, for myself and others coming across this in the future.

It seems like the IBaseFilter's should be replaced with IAsyncReader, when trying to load asyncronously.

https://github.com/openframeworks/openFrameworks/blob/master/libs/openFrameworks/video/ofDirectShowPlayer.cpp#L1048-L1050

IBaseFilter docu: https://msdn.microsoft.com/en-us/library/windows/desktop/dd389526(v=vs.85).aspx
IAsyncReader docu: https://msdn.microsoft.com/en-us/library/windows/desktop/dd376085(v=vs.85).aspx

In case somebody has already been working on this, please let me know what's going on. I'll check this out in more detail soon.

Marcel

Start in libs/openFrameworks/video/ofDirectShowPlayer.cpp around lines 1048-1050 and review the existing Windows DirectShowPlayer loading path. Compare the IBaseFilter and IAsyncReader documentation linked in the issue. Done means loadAsync works under Windows without requiring ofxGSteamer, with the DirectShowPlayer behavior verified against the existing implementation.