[ANNOUNCE] New Mixer Handling in PA 0.9.16/F12

[Dr. Diesel]

On Wed, Jul 29, 2009 at 9:24 AM, Lennart Poettering <mzerqung at 0pointer.de>wrote:

> On Wed, 29.07.09 06:48, Jeff Garzik (jgarzik at pobox.com) wrote:
>
> >
> > Karel Zak wrote:
> >> On Tue, Jul 28, 2009 at 10:07:32PM +0200, Lennart Poettering wrote:
> >>> On Tue, 28.07.09 15:48, Bill Nottingham (notting at redhat.com) wrote:
> >>> Yes. You cannot select them as record source, you cannot mute or
> >>> unmute them, you cannot change their volume. "CD", "PC Speaker",
> >>> "MIDI" and so on are just obsolete.
> >>
> >> This reminds me your note:
> >>
> >>
> https://tango.0pointer.de/pipermail/pulseaudio-discuss/2009-July/004519.html
> >>
> >>     PA does not make use of hardware mixing. And I don't plan to change
> >>     that. It's obsolete technology. CPUs these days come with extensions
> >>     such as MMX or SSE precisely for speeding up DSP tasks such as PCM
> >>     mixing. This is way more flexible that hw mixing, and definitely the
> >>     way to the future, both on the desktop and on embedded envs as well.
> >>
> >>
> >> The "obsolete technology" -- who made this decision? Is it your private
> >> opinion or any suggestion from sound card manufacturers?
> >>
> >> It seems that HW companies still produce the "obsolete technology".
> >
> > Quite agreed [says a former kernel audio driver maintainer], and I will
> > go even farther:
>
> Maybe since the times you worked on audio drivers the design of the
> sound cards changed a little and stuff like SSE became largely available?
>
> > It is completely stupid to waste host CPU on a task that can be
> > offloaded in parallel to dedicated audio hardware.
> >
> > If the user intentionally purchased expensive audio hardware with nice
> > hardware mixing, do not subvert the user's intentions by ignoring such
> > nice hardware.
> >
> > Any developer who claims "always use software mixing" or "always use
> > hardware mixing" is a young, inexperienced fool.  There are valid
> > situations for both choices.
>
> Hear hear, Mr. Garzik is the the old experienced wise man of audio,
> who knows so much more about audio than any of the audio guys at
> Microsoft or Apple.
>
> Happy to take patches.
>
> Lennart
>

Here is a patch, 2 weeks old.

https://bugzilla.redhat.com/show_bug.cgi?id=461546



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