ADAT does work, but often is interrupted by noise - Was: FreeBSD and snd_hdspe last-ditch attempt

[Ralf Mardorf]

Hi :)

if you should be subscribed to jack devel, you might be interested in this  
thread.
http://lists.jackaudio.org/private.cgi/jack-devel-jackaudio.org/2013-January/010610.html
[1]

I don't expect hints, but it's worth to ask.

Oops, I made a mistake, I only tested the inputs, not the outputs.

Regards,
Ralf

[1]
------- Forwarded message -------
From: "Ralf Mardorf"
To: "Jack devel"
Subject: [Jack-Devel] Jack1 on FreeBSD
Date: Fri, 25 Jan 2013 23:20:20 +0100

Hi :)

I'm testing audio on FreeBSD. It can't compare to Linux, but it's anyway
interesting.
The card is a RME HDSPe AIO on FreeBSD used without TotalMix and without
ALSA.

The analog IOs are ok, but I get distortion and click noise or gaps when I
use ADAT. When the source is zynaddsubfx with nperiods there aren't gaps,
but there's distortion and there are clicks.

It's only working in duplex mode and I can't drop the word length setting.
I already switched nperiods from 2 to 3.

It might be, that the driver is buggy, but perhaps I need unusual settings
to use ADAT on FreeBSD.

Does somebody know some (secret ;) settings I should test?

jackd -r -doss -r48000 -p1024 -n3 -w16 -C/dev/dsp4.0 -P/dev/dsp4.0 is one
of the settings I tested.

I still didn't check if there are IRQ issues, which is very likely and if
I can unbind devices on FreeBSD.

jackd -r -doss -r48000 -p1024 -n3 -w16 -C/dev/dsp4.0 -P/dev/dsp4.0

jackd 0.121.3

Except for being limited to only 2 IOs with ADAT and not the very best
latency, the card on Linux can be used for serious production.

It's likely that it's a driver issue, but perhaps there is some magic that
can be done by jack, resp. OSS settings to get it working on FreeBSD too.

Any hints are welcome.

Regards,
Ralf
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