This is a horrible, hacky, proof of concept mess for Pi VU Meter on Volumio It details steps with the old phatmeter library, but should work with PiVuMeter too, simply change "ameter" to "pivumeter" and link the right lib accordingly
REQUIRED: Create /etc/udev/rules.d/60-i2c.rules
with the contents:
KEREL=="i2c-1", GROUP="i2C", MODE="0777"
This allows MPD, which uses the mpd
user and sound
group, to gain access to the i2c bus.
There must be a better way to do this/let MPD run with both audio/i2c groups?
mpd.conf just has "device "softvolume"" specified with other options commented out. Throws errors about missing PCM but vol works.
/boot/config.txt
must include: dtoverlay=i2s-mmap
and dtoverlay=hifiberry-dac
Contents of /etc/asound.conf
as follows:
ctl.!default {
type hw
card 1
}
pcm.dmixer {
type dmix
ipc_key 1024
ipc_perm 0666
slave.pcm 'hw:1,0'
slave {
period_time 0
period_size 1024
buffer_size 8192
}
bindings {
0 0
1 1
}
}
ctl.dmixer {
type hw
card 1
}
pcm.softvolume {
type meter
slave.pcm "softvol"
scopes.0 ameter
}
pcm.softvol {
type softvol
slave.pcm "dmixer"
control {
name "SoftMaster"
card 1
device 0
}
}
pcm_scope.ameter {
type ameter
decay_ms 500
peak_ms 400
brightness 128
}
pcm_scope_type.ameter {
lib /usr/local/lib/libphatmeter.so
}
pcm.ameter {
type meter
slave.pcm 'hw:1,0' #can be hw or hw:0,1 etc...
scopes.0 ameter
}
pcm.dsp0 ameter
Are you sure output is routed through both ameter and dmix?
I had problems using both together (here with pivumeter): pimoroni/pivumeter#27