From kde-core-devel  Mon Aug 16 07:59:43 2004
From: Matthias Welwarsky <matze () stud ! fbi ! fh-darmstadt ! de>
Date: Mon, 16 Aug 2004 07:59:43 +0000
To: kde-core-devel
Subject: Re: ANNOUNCE: HEAD is open for development again
Message-Id: <200408161000.11360.matze () stud ! fbi ! fh-darmstadt ! de>
X-MARC-Message: https://marc.info/?l=kde-core-devel&m=109264318323651
MIME-Version: 1
Content-Type: multipart/mixed; boundary="--Boundary-02=_KmGIBFkNZZwcIf+"


--Boundary-02=_KmGIBFkNZZwcIf+
Content-Type: text/plain;
  charset="windows-1252"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

On Sunday, 15. August 2004 21:51, Charles Samuels wrote:
> On Sunday 15 August 2004 4:12 am, Matthias Welwarsky wrote:
> So if your sound card supports 44.1kHz, then set the kernel to 44.1kHz.=20
> The point is that anyone who needs complete and utter quality will either
> be using a good soundcard (with multiple inputs), or will know they need
> the quality, won't be using Linux on the desktop, and will turn this off
> anyway. The point is that we're not targeting these users anyway.

I don't really see the need to break it by design, beforehand :)

> A linear resampler won't distort as much as the mp3 codec itself!

OK, but there are lossless codecs, too.

> So once you can get a scheduler that can guarantee the the latency of
> user-space-mixed audio, then maybe you'd have a point.

Well, you will basically never get hard realtime anyway, and even if you mi=
x=20
in kernel, the feeding processes are still in userspace and thus at mercy o=
f=20
the scheduler. Doesn't gain you much if only the mixer is in kernel.

But, honestly, how much of a problem is latency for music playback? It is a=
=20
problem with video playback, admitted, but latency is just a function of=20
buffer size, so you should be able to compute the delay and calibrate your=
=20
playback.

And even for video: You hardly notice two or three frames desync, and even=
=20
with NTSC video material this computes to 99ms of acceptable desync, which =
is=20
a _lot_. And if your backend, be it a soundserver or /dev/dsp is able to=20
report the added delay..

Action games have insanely high requirements for A/V delay, to the point wh=
ere=20
they directly map the driver buffers and mix their effects directly in the=
=20
in-kernel memory. Still, their mixer process runs in userspace.

=2D-=20
Matthias Welwarsky
=46achschaft Informatik FH Darmstadt
Email: matze@stud.fbi.fh-darmstadt.de

"all software sucks equally, but some software is more equal"

--Boundary-02=_KmGIBFkNZZwcIf+
Content-Type: application/pgp-signature
Content-Description: signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iD8DBQBBIGmKANO+fpRuZ2IRAkkTAKCdc+1y0f8FNkNX8V8IWrxTL/yH0QCeIcRG
mhnaTpeIApo16S9+FlJDGbg=
=hmkn
-----END PGP SIGNATURE-----

--Boundary-02=_KmGIBFkNZZwcIf+--