16 Dec
2002
16 Dec
'02
8:05 a.m.
Hi,
Josh Green wrote:
[..]
You may want to look into ALSA
(http://www.alsa-project.org) which is
the new Linux sound architecture. Also, it would probably be good to
make sure your audio card is actually capable of full duplex and that
this feature really does work in Linux (with the drivers you decide to
code for). I can't think of any quick and easy programs to test full
duplex (anyone else have any ideas?). Good luck.
I think what you could do in ALSA is to make a "loopback" connection
from your soundcard's Line Out back into its Line In, then playback some
.wav or .mp3 with e.g. aplay and simultaneously (try to) use arecord(*)
to record whatever comes back in on Line In. This way it should be
possible to detect if there is some cheating going on (like, I think,
these old Soundblaster cards where "Duplex" meant 16Bit stereo playback
and at the same time 8bit stereo recording..can anyone confirm?).
(*) For those who don't know: Both aplay and arecord are part of the
alsa-utils package.
Frank