Re: [LAU] Testing JACK and PA latency

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To: Patrick Shirkey <pshirkey@...>
Cc: <linux-audio-user@...>
Date: Thursday, September 19, 2013 - 1:49 pm

On Thu, 19 Sep 2013, Patrick Shirkey wrote:

> On Thu, September 19, 2013 7:19 pm, Hartmut Noack wrote:

I expect the sample rate is to remain the same from one end to the other?
With pulse (or at least some of the apps that work with pulse) that is not
a given.

My first thought would be an analog solution, scope the sound going in and
coming out. Send short pulses of sound through. Anything that is purely
with in the computer would require two measurements, both starting and
ending in jack. So the length of time from jack-alsa-cable-alsa-jack would
be added to jack-pulse-app-pulse-jack. I don't know If you would be
measuring jack twice when you shouldn't but that part of the journey is
probably the best known.

just a thought, jack-alsa-cable-alsa-jack-pulse-app-pulse-jack might give
valid results.

There are some things that could be removed to figure out just parts of
the path. Jack-pulse-pulse-jack for example. I don't know if pulse deals
differently time wise with it's internal routing than with a app though.

--
Len Ovens
www.ovenwerks.net

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Messages in current thread:
[LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 8:46 am)
Re: [LAU] Testing JACK and PA latency, Fons Adriaensen, (Thu Sep 19, 9:42 am)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 10:04 am)
Re: [LAU] Testing JACK and PA latency, Fons Adriaensen, (Thu Sep 19, 10:46 am)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Wed Sep 25, 1:32 pm)
Re: [LAU] Testing JACK and PA latency, Len Ovens, (Thu Sep 19, 2:01 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 2:21 pm)
Re: [LAU] Testing JACK and PA latency, Len Ovens, (Thu Sep 19, 11:48 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Fri Sep 20, 12:57 am)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Fri Sep 20, 8:59 am)
Re: [LAU] Testing JACK and PA latency, Fons Adriaensen, (Fri Sep 20, 10:31 am)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Fri Sep 20, 10:41 am)
Re: [LAU] Testing JACK and PA latency, Fons Adriaensen, (Fri Sep 20, 3:13 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Fri Sep 20, 6:07 pm)
Re: [LAU] Testing JACK and PA latency, Fons Adriaensen, (Fri Sep 20, 7:08 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Sat Sep 21, 11:27 am)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 3:40 pm)
Re: [LAU] Testing JACK and PA latency, Fons Adriaensen, (Thu Sep 19, 12:31 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 12:35 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 10:26 am)
Re: [LAU] Testing JACK and PA latency, Hartmut Noack, (Thu Sep 19, 9:20 am)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 9:39 am)
Re: [LAU] Testing JACK and PA latency, Len Ovens, (Thu Sep 19, 1:49 pm)
Re: [LAU] Testing JACK and PA latency, Patrick Shirkey, (Thu Sep 19, 2:04 pm)