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

[Robin Gareus]

On 12/14/2010 12:11 PM, Robin Gareus wrote:
> On 12/14/2010 10:57 AM, ailo wrote:
>> ...or to load devices into specific alsa-slots (hw:0, hw:1...)
>>
>> Does someone have a nice method to do one of these?
>>
>> Since I knew of no other method, I tried loading the cards into specific
>> slots, according to this method found at planetccrma's home page:
>>
>> alias snd-card-0 snd-CARD_0
>> options snd-card-0 index=0
>> options snd-CARD_0 index=0
>> alias snd-card-1 snd-CARD_1
>> options snd-card-1 index=1
>> options snd-CARD_1 index=1
>> ...
>> alias snd-card-N snd-CARD_N
>> options snd-card-N index=N
>> options snd-CARD_N index=N
>>
>> I have two m-audio delta devices and I never found a good way to
>> configure alsa so they would load in a specific order. There was the
>> problem of naming, since both cards have the same name.
>>
>> I think I would prefer the pulseaudio method, which remembers the card
>> itself, not the alsa slot (I don't know anything about that, to be honest).
>>
>> Other things to consider is:
>> More than 5 devices will be used, some of them usb midi (usb midi
>> devices also appear in alsa sound slots).
>> Two m-audio delta cards for audio input (8 + 4 inputs), and at least the
>> sound cards need to always load in the same order with jack.
>>
>> Is it possible to get jack/alsa to remember the sound cards after reboot?
>>
> 
> This has been discussed a couple of times on this list, search the
> list-archive for details.
> 
> The idea is to refer to audio interfaces by name or device-id rather
> than numeric ID.
>   cat /proc/asound/cards
> gives you a list. - use the names between the square brackets
> 
> e.g.
> jackd -R -P70 -t1000 -dalsa -d 'hw:Intel' -r48000 -p1024 -n2
> 
> HTH,
> 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.

best,
robin