linux-kernel - alsa was Re: ABI coupling to hypervisors via CONFIG

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Message-ID: <20070314084155.GA3993@ucw.cz>
Date:	Wed, 14 Mar 2007 08:41:55 +0000
From:	Pavel Machek <pavel@....cz>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Zachary Amsden <zach@...are.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>, akpm@...ux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: alsa was Re: ABI coupling to hypervisors via CONFIG_PARAVIRT

Hi!

> >I think the sound example to the right really shows it. 
> >/dev/dsp has a
> >consistent ABI on a ton of systems. The API below it, 
> >varies. Linux got
> >file_operations and ALSA. Solaris/BSD may have its
> >vnode-and-so-on-functions and some sort of OSS.
> 
> I think this is a poor example as applications lose a 
> lot of
> functionality (multiple stream mixing, software volume 
> control, etc)
> by going through the legacy /dev/dsp interface vs. using 
> native ALSA.

OTOH /dev/dsp is nice, clean, unixy interface, while alsa creates ugly
ABI you should not even use unless you are libalsa. ouch.
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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