I don't have my notes with me now, but in the past I used one of the PC command line programs, I think it was called rtl_tcp, that caused I/Q data to be streamed in via TCP. I used LabVIEW to read in the data which came in as interleaved 8 bit I/Q pairs. That's the way the dongle works. It streams out a baseband waveform. Everything from there is software.