> On 2/24/2021 1:43 PM, paul- wrote:
> > pgf wrote:
> > [... wants to let two audio sources use pCP's output at a time...]
> >>
> > Squeezelite on pCP directly accesses alsa. Only one process can
> access
> > the alsa device at time, so you will need to do a full pulseaudio
> system
> > to do what you want. You might try to build your system up with
> > RaspiOS, or use piCore directly.
> >
> >
>
> If the hardware supports it, two processes can share the same alsa
> output by using the "dmix" device. With squeezelite I was able to get
> two processes to share the Analog Output using the same dmix device. I
> guess I was thinking that I could switch between streams by pausing one
>
> and starting the other in LMS but I never pursued it.
>
> I don't know if pCP would support that.
>
> John
Thanks -- I had given up on using dmix years ago when pulseaudio solved
my problems so well, but in fact, just yesterday afternoon I implemented
this, and it (almost) works just fine.
I've created a .asoundrc file that looks like this, in both /root and
/home/tc (and I've added /root to /opt/.filetool.lst, so /root gets
backed up):
Code:
--------------------
# taken from:
#
https://stackoverflow.com/questions/7002423/how-to-mix-multiple-pcm-streams-using-alsa
pcm.hw1mix {
type dmix
ipc_key 1939 # must be unique
ipc_perm 0666 # mixing for all users
slave {
# pcm "hw:1"
pcm "hw:CARD=sndrpihifiberry,DEV=0"
period_time 0
period_size 1024 # must be power of 2
buffer_size 4096
rate 44100
}
bindings {
0 0
1 1
}
}
pcm.!default hw1mix
--------------------
After doing that, "hw1mix" now appears in the pCP device selection menu.
If I select that, squeezelite will use it happily, and my HifiBerry
AMP2 works with two "inputs".
It's necessary to put the .asoundrc into a) /root so that it affects
squeezelite's view of alsa, and b) into /home/tc to affect tc's view.
tc needs it because I'm running a poor-man's network audio server. On
the remote host that has something to say, I run (essentially):
Code:
--------------------
$ ssh tc@picore aplay < myannouncement.wav
--------------------
There's probably a way to avoid the duplication of .asoundrc -- I'll
look into it.
The other issue I have is that when pCP first boots, squeezelite doesn't
come up -- it fails because hw1mix isn't available. If I simply restart
squeezelite, it works fine. I'll either figure out a fix, or a
workaround.
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