MacOS frame drop

[roefer]

The current implementation still does not reach 30 Hz on MacOS. This is due to bad scheduling of USB transfers in libusb. A fix can be found at http://www.informatik.uni-bremen.de/~roefer/libusb/libusb-osx-kinect.diff .

In camera.c, I use PKTS_PER_XFER = 128, NUM_XFERS = 4. There are a few rules: PKTS_PER_XFER * NUM_XFERS <= 1000, PKTS_PER_XFER % 8 == 0.Initialization seems to work better when send_init() is called before the transfer packets are submitted, i.e. before the loop in cams_init().

[qdot]

Awesome, I just tested this and everything works great! Thank you so much for this patch, we were kinda stumped on what was happening there.

I'll go ahead, add this code and credit you in the commits. :)

[ofTheo]

whoohoo - now os x doesn't have to feel like the slow kid in class :)
thanks for digging into the libusb stuff.

[qdot]

Merged and closed.