On 05/18/2014 03:57 PM, Clemens Ladisch wrote:
> elboulangero wrote:
>> I recently discovered the softvol plugin, and used it to add a Master
>> volume to my USB soundcard, which doesn't have one. I followed the
>> tutorial from alsa.opensrc.org [1].
>>
>> I'm quite happy with it, but I found a little issue that I'd like to
>> share here.
>> The trouble is that the softvol appears as both a playback/capture
>> device
> This is because the .asoundrc applies it to both playback and capture.
>
> Try this instead:
>
> pcm.!default {
> type asym
> playback.pcm {
> type plug
> slave.pcm "softvol"
> }
> capture.pcm {
> type plug
> slave.pcm "hw:0" # or whatever
> }
> }
>
> To prevent the mixer from showing it as a capture control, name
> it "Master Playback Volume" instead.
>
>
> Regards,
> Clemens
Hi Clemens,
thanks a lot for the explanations, your piece of conf works perfectly !
My master volume is now presented by amixer under the name 'Master',
with a pvolume capability. It appears only in playback. Great !
Now, just out of curiosity, I tried to name the softvol control with
another name, like 'Master2'. In this case, the mixer is presented under
the name Master2, but appears both in playback and capture. So my
understanding is that:
- control name can be anything
- however, some names (like "Master Playback Volume") have a special
meaning.
Am I correct ?
In the doc [1], I can read the following:
"If the control already exists and it's a system control (i.e. no
user-defined control), the plugin simply passes its slave without any
changes."
Does that mean that "Master Playback Volume" is a system control ?
Is it easy to get a list of such system controls, or is it something
that must be looked at directly in the source code ?
Regards,
Arnaud
--
Definitive asoundrc for my USB soundcard:
# Create a virtual device to control the volume
pcm.softvol {
type softvol
slave {
pcm "sysdefault:CARD=K6"
}
control {
name "Master Playback Volume"
card "K6"
}
}
# Set K6 as default, and assign playback to softvol device
pcm.!default {
type asym
playback.pcm {
type plug
slave.pcm "softvol"
}
capture.pcm {
type plug
slave.pcm "sysdefault:CARD=K6"
}
}
ctl.!default {
type hw
card "K6"
}
--
[1] http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html
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