config-looper/check-umc.sh

#!/bin/sh

state=""

while :; do
    alsa_four=0

    for stream in /proc/asound/card*/stream0; do
        [ -r "$stream" ] || continue
        grep -q '^BEHRINGER UMC404HD' "$stream" || continue

        if awk '
            /^Capture:/ { capture=1; next }
            capture && /Channels: 4/ { found=1 }
            END { exit !found }
        ' "$stream"; then
            alsa_four=1
        fi
        break
    done

    if [ "$alsa_four" -ne 1 ]; then
        if [ "$state" != "usb" ]; then
            echo "UMC absente ou moins de 4 canaux ALSA : pas de redémarrage WirePlumber"
        fi
        state="usb"
        sleep 20
        continue
    fi

    ports=$(pw-link -o 2>/dev/null |
        grep -c '^alsa_input\.usb-BEHRINGER_UMC404HD_192k-00\..*:capture_')

    if [ "$ports" -ne 4 ]; then
        echo "UMC : 4 canaux ALSA, mais $ports ports de capture PipeWire ; redémarrage WirePlumber"
        state="pipewire"
        systemctl --user restart wireplumber.service
        sleep 60
    else
        if [ "$state" != "ok" ]; then
            echo "UMC : 4 canaux de capture disponibles dans PipeWire"
        fi
        state="ok"
        sleep 20
    fi
done