round trip latency measurement

[mixxxbot]

Reported by: Be-ing
Date: 2018-02-19T07:29:32Z
Status: Confirmed
Importance: Wishlist
Launchpad Issue: lp1750331

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Currently users need to use another program to measure the round trip latency to use for latency compensation of microphones. It would be nice if this could be done directly in Mixxx. We could adapt the code from JACK's iodelay tool which is licensed under the GNU GPL v2 or later: https://github.com/jackaudio/jack2/blob/master/tests/iodelay.cpp