Current state of CAVA (visualizer) support (especially for streaming sources)?

Diy and Tweaks
8

Hi nate_eagle

I just configured the ALSA loopback copy, and it worked out fine. These are the steps

Enable software mixer: Settings > Playback Options > Mixer

Check your soundcard name

aplay -l

Mine is sndrpihifiberry

card 2: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 [HifiBerry DAC HiFi pcm5102a-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Edit /etc/asound.conf

nano /etc/asound.conf

remove what is there and add the following, but use your sound card name where mine appears

pcm.softvolume {
    type             plug
    #slave.pcm       "softvol"
    slave.pcm       "softvolume2"
}


pcm.softvol {
    type            softvol
    slave {
        pcm         "plughw:sndrpihifiberry,0"
    }
    control {
        name        "SoftMaster"
        card        1
        device      0
    }
max_dB 0.0
min_dB -50.0
resolution 100
}
pcm.softvolume2 {
    type plug
    slave.pcm {
        type multi
        slaves {
            a { channels 2 pcm "softvol" }  # the real device
            b { channels 2 pcm "hw:Loopback,0" }  # the loopback driver
        }
        bindings {
            0 { slave a channel 0 }
            1 { slave a channel 1 }
            2 { slave b channel 0 }
            3 { slave b channel 1 }
        }
    }
    ttable [
        [ 1 0 1 0 ]   # left  -> a.left,  b.left
        [ 0 1 0 1 ]   # right -> a.right, b.right
    ]
}

Add the loopback device to load at boot. Edit the following file

sudo nano /etc/modules

Add the line

snd-aloop

Reboot!

Check the loopback device is loaded

aplay -l

You should see lines like

card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 7/8
  Subdevice #0: subdevice #0
...

When you play audio you can now get a copy from plughw:Loopback,1

Using mpd_oled the command to use this copy is something like

sudo mpd_oled -o 6 -b 21 -g 1 -f 15 -c alsa,plughw:Loopback,1

Thats it!

Adrian.

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