21 Mar
2005
21 Mar
'05
3:48 p.m.
Hi Antonio,
On Monday 21 Mar 2005 05:48, Antonio "Willy" Malara wrote:
jack.udp for me means many underrun in this
configuration:
x86 pc
jackd -d alsa -d hw:0
jack.udp recv
^
| (FastEthernet network (100mbps))
powerpc pc
jackd -d dummy
jack.udp -r IP send
the first thing that came in my mind was some network troubles like
mtu.. further investigation (like involving two x86 hosts, or working
directly without the switch, working with 802.11b networks...) made me
think that jack.udp uses the audiocard driver for some kind of timing.
now, i've some troubles running an audiocard with jack in the powerpc
(my main computer) there is a way to make this system usable with dummy
driver? i've noticed that this dummy driver has a "delay in microsecs"
parameter, now i think if i can calculate the right number the problem
will fade away, but i dont know how to do the math :(
some one has an idea on this? or has solved a similar trouble?
I have no real answers but as I've been thinking about using jack.udp (in
exactly this setup) in a while I realize I'm up for the same problems.
I think Jack uses the sound card as timing source and that is the pipe that
all other apps have to dance to.
With two different computers with two different jack instances, both operating
with this precondition, I can't see how it can possibly work... Is anyone
successfully using two jack instances like this?
One use case I've been thinking about myself is offloading for example
linuxsampler and brutefir (or the other IR reverb wosname) to a second
computer. In case of the reverb I'd like to send data both ways.
Would it be possible to change something in jack to allow one of the instances
to "slave" from the other?
Interesting stuff, thanks for the heads up!
Regards,
Robert
another question out of this trouble: someone knows how to raise the IRQ
priority of the USB controller to an usable value? possibly not
involving the use of the realtime patch, inusable on ppc-powermac,
thanks for attention and eventual replies, and keep the good work on
this audio software :)
willy
--
http://spamatica.se/musicsite/