Re: [LAU] Estimating JACK latency

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: <linux-audio-user@...>
Date: Tuesday, April 17, 2012 - 5:10 pm

On Mon, Apr 16, 2012 at 05:21:47PM -0400, S. Massy wrote:

> Okay, so for a standard 2 periods of 128 frames each, my nominal dddelay

No. The nominal roundtrip-delay (physical input to physical output
if you connect the corresponding ports directly) is period * nperiods.

1 * period occurs at the input, (nperiods - 1) * period at the output.

If you masure it using jack_delay you will in most cases find a value
that is a bit higher, this is due to delay in AD/DA converters etc. For
some types of soundcard (e.g. USB) the real latency can be significantly
higher than the nominal value. You can tell Jack about this using the
-I and -O options.

The extra delay when making a loop such as Ardour -> jconvolver -> Ardour
is one period.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
[LAU] Estimating JACK latency, S. Massy, (Mon Apr 16, 7:33 pm)
Re: [LAU] Estimating JACK latency, Paul Davis, (Mon Apr 16, 8:54 pm)
Re: [LAU] Estimating JACK latency, Joel Roth, (Sun May 13, 12:21 pm)
Re: [LAU] Estimating JACK latency, Paul Davis, (Sun May 13, 12:46 pm)
Re: [LAU] Estimating JACK latency, S. Massy, (Mon Apr 16, 9:24 pm)
Re: [LAU] Estimating JACK latency, Fons Adriaensen, (Tue Apr 17, 5:10 pm)
Re: [LAU] Estimating JACK latency, Joel Roth, (Thu May 3, 2:52 am)
Re: [LAU] Estimating JACK latency, Fons Adriaensen, (Thu May 3, 10:15 am)
Re: [LAU] Estimating JACK latency, S. Massy, (Thu May 3, 4:54 pm)
Re: [LAU] Estimating JACK latency, Joel Roth, (Thu May 3, 8:36 pm)
Re: [LAU] Estimating JACK latency, Joel Roth, (Thu May 3, 2:27 am)
Re: [LAU] Estimating JACK latency, Robin Gareus, (Thu May 3, 8:21 am)
Re: [LAU] Estimating JACK latency, Paul Davis, (Mon Apr 16, 9:38 pm)