[linux-audio-user] Re: asoundrc and aplay

[conrad berhörster]

Hello Arnold, 
Am Donnerstag 16 Februar 2006 22:14 schrieb Arnold Krille:
> 2006/2/16, conrad berhörster <conrad.berhoerster at gmx.de>:
> > well, i have 2 soundcards and want to capture from both at the same time
> > with
> > jack. i don't need sample sync (or such bad things ;=) ) only need the
> > signal, each channel individual but into one app, i have written.
>
> Two explain Pauls Jedi-magic:
Thanks very much, Paul was a little bit to "short" ;=)


> If you use jack, you want sample-sync. If you don't want sample-sync
> and just want to record two independent streams into your software
> (assuming you don't want to use it for music[*]) you just have to open
> both sounddevices the alsa way and process according to the
> alsa-interface.
No, this is not quite right for me. sample-sync is not the only reason, why 
someone uses jack. i use it i my app, because
- easy programming interface , better than alsa. 
- take some other apps and get/set data from/to them

i need that inputs not in a harddisk recording / pro audio way. all i need is 
getting the signal into the app, use some effects and put them out again. no 
sample sync, no need for "realtime". all inputs are independed. 
Than i have read http://alsa.opensrc.org/TwoCardsAsOne. 
is this page wrong! 
i thought, one big advantage of jack is, to handle more than one card. 
 
>
> [*] If you want to do music with it, you want sample-sync...
>
> Enough things have been said about way two soundcards without syncing
> can't be used as one multichannel device, so I won't repeat it here.
yes, i know. i have read them too. maybe you can explain, what you mean 
exactly with the notion "multichannel device". Is it just a couple of IOs, 
without sync, or are the requirements for pro audios (with sync).

if all this stuff isn't possible, do you have any idea to fix the problem. 

thanks c~