Re: [Jack-Devel] JACK on mobile

On Wednesday 16 October 2013 22:49:01 you wrote:
> Well Christian you are speaking of the 2 * buffer size latency here right?
> 
> OSX usually decompose I/O latency as = AD conversion latency + input
> latency offset + 2 * buffer size +  output latency offset + DA conversion
> latency
> 
> So I would guess the minimal I/O latency on IOS is more than the 2.9 ms
> value….

Yes, exactly.

Or if the use case is a soft synth with ext. keyboard, you must at least add
1.0 ms on input chain side because of the minimum theoretical USB polling 
interval (for "low" & "full speed" USB endpoints that is, which are still used 
in most USB MIDI controllers), plus probably even more for poor demultiplexers 
in inexpensive keyboards, etc.

So if the original question was rather precise total end to end latency 
measurements, then sorry, cannot serve. ;-)

CU
Christian

1381964529.4106_0.ltw:2, <201310170107.34461.schoenebeck at crudebyte dot com>