Kinect2 device for FFmpeg, libfreenect2

I've been working on a kinect2 device backend for FFmpeg the last few days. Actually it's only about a day's work so far and i've got the code talking to the c++ (sigh) libfreenect2, building, and most of the glue written - I just haven't tested it with the hardware yet. I hope it should be quite straightforward but FFmpeg is a fairly complex library and there are a lot of details that could be wrong.

One feature it has is that the jpeg frames are not decoded; which means cheaper recording and no loss of capture quality. I had to make some minor modifications to libfreenect2 for this to be possible.

It exports 3x streams: the RGB data as jpeg, the IR data as grey16, and the depth data as grey16. I have options to enable various subsets of these streams, so for example depth+ir decoding can be skipped as it requires a good amount of flops. Cameras are referenced by serial number or index. Device queries work as do some basic capture settings. I'm also considering other options which libfreenect2 provides such as streams with the depth/rgb aligned to each other.

Once I have it at a working state and ported to git head (FFmpeg git was down when i started working on it) I will see if FFmpeg is interested in it. The fact that it requires c++ and a patched libfreenect2 might be a downside but there is already a c++ device in the source tree. Otherwise i'll just upload it to code.

This was going to be for work but they decided they'd rather use some junk matlab (ffs) on a shit platform (fffs) so i'm a little annoyed about the whole thing. While it should be possible to get this to work on their chosen shit platform as well it's a bit more involved.