28 Apr
2004
28 Apr
'04
8:04 p.m.
I'm a bit surprised noone knows of a way to specify just one channel of a
given output device, i.e., just the LEFT channel or the RIGHT channel of the
main PCM output device. The asoundrc syntax documentation is extremely
lightweight in this regard. The closest thing I've seen is an example
showing how to bind two stereo output devices into a single 4-channel output
device using "bindings" directives.
I'd appreciate any pointers.
Thank you,
=MB=
--
A focus on Quality.
28 Apr
28 Apr
8:14 p.m.
New subject: [linux-audio-user] Is there no way to split L+R channels for ALSA applications?
Malcolm Baldridge wrote:
I'm a bit surprised noone knows of a way to
specify just one channel of a
given output device, i.e., just the LEFT channel or the RIGHT channel of the
main PCM output device. The asoundrc syntax documentation is extremely
lightweight in this regard. The closest thing I've seen is an example
showing how to bind two stereo output devices into a single 4-channel output
device using "bindings" directives.
I'd appreciate any pointers.
Thank you,
=MB=
It's sort of an overall weakness of letting every application do what it
wants, I think, instead of a more centralized way of setting up
requirements for Alsa applications.
Anyway, when I've needed to do this sort of thing I've been lucky enough
to have Jack applications that will handle my audio data formats. At
that point I just use qjackctl to route the left or right outputs where
I want them to go.
Maybe you can do the same, or something similar?
- Mark
29 Apr
29 Apr
7:40 a.m.
Malcolm Baldridge wrote:
a way to specify just one channel of a given output
device, i.e.,
just the LEFT channel or the RIGHT channel of the main PCM output
device.
pcm.left {
type plug
slave.pcm "hw:0"
slave.channels 2
ttable.0.0 1
}
pcm.right {
type plug
slave.pcm "hw:0"
slave.channels 2
ttable.0.1 1
}
If you want to use both devices at the same time, you have to use the
dshare plugin:
pcm.shared_left {
type plug
slave.pcm {
type dshare
ipc_key 123456
slave.pcm "hw:0"
slave.channels 2
bindings.0 0
}
}
pcm.shared_right {
type plug
slave.pcm {
type dshare
ipc_key 123456
slave.pcm "hw:0"
slave.channels 2
bindings.0 1
}
}
HTH
Clemens
8:45 a.m.
Quoting Clemens Ladisch <clemens(a)ladisch.de>de>:
pcm.left {
type plug
slave.pcm "hw:0"
slave.channels 2
ttable.0.0 1
}
pcm.right {
type plug
slave.pcm "hw:0"
slave.channels 2
ttable.0.1 1
}
THANK YOU SO MUCH, Clemens. Is there a good source of documentation for
these directives anywhere? I've never seen ttable adequately documented
anywhere in the main alsa-org site, or at least, nowhere I've been able to find.
Thank you as always, for supporting Quality,
=MB=
--
A focus on Quality.
10:28 a.m.
Malcolm Baldridge wrote:
Quoting Clemens Ladisch <clemens(a)ladisch.de>de>:
AFAIK there is no good one, there is only
<http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html>.
Regards,
Clemens
ttable.0.0 1
Is there a good source of documentation for these directives
anywhere?
7572
days inactive
7573
days old
linux-audio-user@lists.linuxaudio.org
4 comments
3 participants
participants (3)
-
Clemens Ladisch -
Malcolm Baldridge -
Mark Knecht