[LAU] How to make Jack remember soundcards, not alsa-slots

[torbenh]

On Tue, Dec 14, 2010 at 05:44:36PM +0100, ailo wrote:
> On 12/14/2010 12:28 PM, Florian Faber wrote:
> >Robin,
> >
> >>OOPS: I've just realized that two of your devices are identical.
> >>I don't think the name will help in that case. IIRC there's away to use
> >>a UID or BUS like /dev/snd/by-path/.. but I don't remember the details
> >>just now.
> 
> Actually, the cards do have different names, now when I think of it.
> It's the chip that is the same.
> Still, it feels better to use an unique id. Perhaps /dev/snd/by-path
> is a good way to do that. If I understand correctly, this is the
> path to the actual pci-slot (which is not likely to change between
> boots).
> 
> >
> >If the ICE-cards have serial numbers, it could be an effective solution
> >to add it to the card's name. RME cards are quite commonly used in
> >bundles, so I added this feature:
> >
> ># cat /proc/asound/cards
> >  0 [default        ]: HDSPM - RME MADI_c61f8e
> >                       RME MADI S/N 0xc61f8e at 0xfdef0000, irq 16
> >
> >It also allows to identify cards in the LAN. In infrastructure setups
> >the host no longer is the top level namespace.
> >
> >
> >Flo
> 
> 
> With my limited understanding the only thing I can discover here is:
> 
> 0 [default   ]
> 
> is usually :
> 
> 0 [nameofcard  ]
> 
> So, I'm afraid I can't read further into how to use the serial
> number to identify the card.
> 
> 
> Starting jack by using
> 
> jackd -d alsa -d 'hw:nameofcard'
> 
> may solve my problem.
> 
> I'm looking on how to sync the two cards, delta-1010 and delta-66.
> AFAIK, no matter the method, it seems one must sync them using spdif
> (don't think this is needed on Windows, but perhaps that has to do
> with proprietary drivers?).
> 
> There is this method:
> http://www.jrigg.co.uk/linuxaudio/ice1712multi.html
> 
> and one that I haven't tried yet is using alsa_in and alsa_out as
> mentioned here:
> http://trac.jackaudio.org/wiki/WalkThrough/User/AlsaInOut
> 
> If someone has some experience in using multiple cards, I won't mind
> a pointer or two.

the wiki page on alsa_io is outdated.
see the manpage.

if you run jackd with a period size of 128... running alsa_out -d hw:1 -p 128
should give you good results with jack >= 0.118


> 
> -- 
> ailo
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-- 
torben Hohn