At Wed, 13 Mar 2002 08:01:02 -0500 (EST),
Adam K Kirchhoff wrote:
>
> The solution the Jaroslav gave in that e-mail actually requires changes to
> the ymfpci driver, as I understand it. Last time I pulled code from CVS,
> this hadn't been done yet. From the sound of it (based on your
> experience) it looks like it still hasn't been done. At the moment, I
> don't really understand Alsa (or sound drivers in general) well enough to
> make the change myself, nor do I really have the time to pick up that
> knowledge at the moment.
>
> However, it's also my impression from Jaroslav's explanation that this
> would simply duplicate the output from the fron channel on the rear
> channel. Can someone let me know if this is correct?
if you only need duplication, this can be done on alsa-lib without
changing the driver itself.
try to add the following in your ~/.asoundrc.
pcm.ch4dup {
type plug
slave.pcm surround40
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}
then run like this
% aplay -D ch4dup foo.wav
To use this technique on OSS emulation, you'll need aoss wrapper
(included in alsa-oss package).
suppose that the application uses /dev/dsp, add the following in
~/.asoundrc.
pcm.dsp0 pcm.ch4dup
then run your oss application via aoss script
% aoss foobar
Takashi
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