[mythtv-users] SPDIF digital volume control - Do I have it right?
ozizaeb at comcast.net
ozizaeb at comcast.net
Mon Jan 2 05:32:11 UTC 2006
I struggled for many days with lots of searches on various sites for this
solution. I had my ALSA config per the DigitalSoundHowTo but wanted to be
able to control the volume of mixed-digital output with my Happauge PVR-250
remote. I came across some entries about the "softvol" ALSA plugin. After
playing around with it I was able to get the PCM volume control to control my
SPDIF digital output jack volume with the following /etc/asound.conf
adjustments.
# Control device (mixer, etc.) for the card
pcm.mixed-digital {
type plug
slave.pcm "spdifvol" # <- This used to be "dmix-digital" per
DigitalSoundHowTo. Now points to the spdifvol definition.
}
# Added this entire section which filters the dmix-digital with the "PCM"
control. My SPDIF jack is device 1 of my ATI IXP 150 PCI audio controller.
pcm.spdifvol {
type softvol
slave.pcm "dmix-digital"
control {
name "PCM"
card 0
device 1
}
}
Since I'm not by FAR from an ALSA expert I'm not exactly sure this the
"correct" way of using softvol. Maybe someone with more experience can
correct it or tell me why it doesn't exactly work. It seems to work for me
but I could be missing something. If it is correct, it would be a nice thing
to add to the DigitalSoundHowTo.
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