Where to include DSP code

Hi All,

I have just got started creating a small clt for beamforming with the MS Kinect in C using libsoundio, following the example pieces of code (mainly the microphone example). I have set up my devices etc and have come up to the point of creating read/write callbacks.

Which is where my question pops up. I want to do some DSP before output (obviously), where would the best place to put this be - in one of the read/write callbacks or within a new "process" callback that I create (so an extra buffer as well?). The beamforming DSP I have prototyped in matlab should be run realtime and I am confident it can be, it can get quite computationally intensive though.

Any thoughts/tips would be great.

Thanks.