Re: [LAD] JACK latency compensation on USB audio devices

From: Joakim Hernberg <jhernberg@email-addr-hidden>
Date: Fri Sep 04 2015 - 00:42:20 EEST

On Wed, 2 Sep 2015 23:51:36 +0200
Adrian Knoth <adi@email-addr-hidden> wrote:

> On 09/02/15 21:35, Joakim Hernberg wrote:
>
> > Well yes, I'm aware of that and it was this extra latency that I
> > wanted to ascertain. What puzzles me is that each time the jack
> > server is invoked, it will need a different amount of latency
> > compensation even when no other parameters have changed.
>
> Didn't Fons mention a similar problem lately? (think two weeks ago).
>
> He's currently travelling, but maybe you want to check out his patches
> (yet to be posted).
>
> Note that Fons' patches are only about client execution order in
> jackd1. If you also get different values in jackd2, then it's either
> unrelated or needs fixing as well.

IIRC the problem Fons uncovered had to do with the effective latency
changing by one period when clients connected/disconnected. This
doesn't appear to be related. And AFAIK it only happens with USB
devices.

-- 
   Joakim
_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-dev
Received on Fri Sep 4 04:15:12 2015

This archive was generated by hypermail 2.1.8 : Fri Sep 04 2015 - 04:15:12 EEST