Re: Multi ice1712 .asoundrc problem

[John Rigg <ad@sound-man.co.uk>]

On Mon, Nov 14, 2005 at 07:06:47PM +0000, John Rigg wrote:
> On Mon, Nov 14, 2005 at 05:55:13PM +0200, Pasi Kärkkäinen wrote:
> > I was reading jackd alsa-driver source, and found out, that the "poll time
> > out" messages come from poll() system call while jackd is waiting for data
> > from alsa.. so the problem is most propably in alsa.. multi plugin?
> 
> A reasonable assumption.

On second thoughts I think it's driver related. It appears to be impossible to 
set the channel count. eg.:

jackd -d alsa -d -C -i8 hw:0

results in the following message:
ALSA: cannot set channel count to 8 for capture
(the code that generates this message is in drivers/alsa/alsa_driver.c)

The docs say that channel count can be set to anything up to maximum
(which is default). They also say that the number of slaves channels in
multi definition can be set to any number up to maximum.
We should be able to define one multi device with say 10 slaves channels
per card, and one set of bindings, and have it work in duplex mode.

What we actually have is a slaves channel count which can only be set to the
maximum, ie. 12 for capture or 10 for playback.
The multi plugin requires the number of slaves channels to be explicitly
defined, but doesn't allow separate definition for capture and playback
(unlike jackd, eg. `jackd -d alsa -d -C -i12 -P -o10 hw:0').

John




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