Re: [Alsa-user] help with mmap and ice1712

[Sol <sc...@fo...>]

On Mon, 2003-09-15 at 11:18, Jaroslav Kysela wrote:
> yOn Mon, 15 Sep 2003, Clemens Ladisch wrote:
> 
> > Sol wrote:
> > > I'm looking for help with a problem I seem to be having with an ice1712
> > > card using mmap.
> > >
> > > I am unable to use mmap access for the card.  For example, using xmms, I
> > > have to uncheck the mmap option for sound.
> >
> > AFAIK the ICE1712 doesn't support interleaved samples in hardware,
> > while xmms doesn't support anything but interleaved when mmap-ing.
> 
> ICE1712 chip uses the interleaved stream, but it uses 10 - 32-bit only -
> channels (which is quite different that other hardware).
> 
> 						Jaroslav
> 
> -----
> Jaroslav Kysela <pe...@su...>
> Linux Kernel Sound Maintainer
> ALSA Project, SuSE Labs

I see!  So, you have to specify 32-bit 10 channel interleaved at all
times if you want to MMAP.  I'm going to look into having an .asoundrc
that would do this for the plug level(if this is possible).

Just curious, where would be the best place to learn about the specifics
and requirements of sound cards?  Would it be best to look at the driver
source in the alsa-driver?

Thank you Jaroslav and Clemens for your response!

Cheers,

Sol