From kde-devel  Tue Apr 30 12:12:19 2002
From: Thiago Macieira <thiagom () wanadoo ! fr>
Date: Tue, 30 Apr 2002 12:12:19 +0000
To: kde-devel
Subject: Re: KDE's aRTs and VMWare
X-MARC-Message: https://marc.info/?l=kde-devel&m=102016891225984

Hetz Ben Hamo wrote
>Hi People,
>
>I'm trying to play a bit with aRTs and with VMWare (to see if I can capture
>the sound out of vmware, or maybe to tweak it a bit)...
>
>I've tried to run: artsdsp vmware
>
>This is running, but according to arts-control - the aRTs doesn't get
> anything out of it. I have also tried artdsp xmms for testing (with the o=
ss
> driver) - this time it seems aRTs is indeed routing the sound and plays it
> (with a small problem - when I stop XMMS, aRTs keeps playing for 1 more
> second)..
>
>My question: how can I force VMWare to output the sound through arts? is
> there a way to record what arts is getting?

The problem with running artsdsp vmware is that artsdsp works by using=20
LD_PRELOAD. Since vmware is a setuid application, the loader simply ignores=
=20
the LD_PRELOAD variable. I have two solutions for that:

1) Create a /etc/ld.so.preload file and place the required aRTs libraries=20
there:
/usr/lib/libartsdsp.so
/usr/lib/libartsc.so

Please note that that file should be available only when vmware is run.=20
Otherwise, all programs shall get the libraries loaded -- which would be li=
ke=20
running all of them with artsdsp.=20

Then again, that might not be such a bad idea...

2) This is Linux-specific and works for me because I use ALSA.
I used the snd-card-dummy module and so it loaded for me /dev/snd/pcmC1D0p =
and=20
/dev/dsp1. I just told VMWare to use /dev/dsp1 instead of /dev/dsp for its=
=20
sound output.

Then I run this in a konsole terminal:
artscat /proc/asound/1/pcmloopD0S0p -b16 -c2 -r44100

And then note that the sound works right only when the guest OS is playing =
at=20
44.1 kHz, 16-bit and stereo. But the nifty thing is that you can also do an=
=20
oggenc -r /proc/asound/1/pcmloop/D0S0p -o myrecording.ogg

Why am I using the second alternative, which is more difficult? Because I=20
using the aRTs libraries to play sound makes things go slower. In VMWare, y=
ou=20
hear only pieces of the sound, with silent interruptions. And while playing=
=20
movies in xine and mplayer, I notice that less image frames are output (ful=
l=20
screen, VMWare is running). It seems that the libraries take up too many=20
cycles...

=2D-=20
  Thiago Macieira - UFOT Registry number: 1001
 thiagom@mail.com
   ICQ UIN: 1967141  PGP: will create new keys. Erase the old ones!
     Registered Linux user #65028

 
>> Visit http://mail.kde.org/mailman/listinfo/kde-devel#unsub to unsubscribe <<