linux-kernel - Re: Is it time for remove (crap) ALSA from kernel tree ?

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Date:	Mon, 25 Jun 2007 14:47:50 +0200
From:	Olivier Galibert <galibert@...ox.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Tomasz K?oczko <kloczek@...y.mif.pg.gda.pl>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: Is it time for remove (crap) ALSA from kernel tree ?

On Mon, Jun 25, 2007 at 02:40:23PM +0200, Jan Engelhardt wrote:
> 
> On Jun 25 2007 14:31, Takashi Iwai wrote:
> >> It was started in time when most cheap sound cards was without hw mixer.
> >> And .. when today you use ALSA on sound card without hw mixer still all 
> >> this (past ?) problems are actual.
> >
> >Huh?  I have no problems with soft mixing...
> 
> Diverging from the discussion, how is soft mixing actually done? If it was done
> in userspace, it would need shared memory, or a back relay from kernelspace to
> userspace (and back again for the final output), otherwise I could not imagine
> how all alsa streams came together at one point.

SysV shared memory and semaphores, done in the alsa lib.

Yes, your kernel sound access library does shared mem, semaphores,
fork+exec and friends.

Back relay and virtual devices is the way it should have been done.

  OG.
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