DankMaterialShell/quickshell/Services/CavaService.qml

pragma Singleton
pragma ComponentBehavior: Bound

import QtQuick
import Quickshell
import Quickshell.Io

Singleton {
    id: root

    property list<int> values: Array(6)
    property int refCount: 0
    property bool cavaAvailable: false

    Process {
        id: cavaCheck

        command: ["which", "cava"]
        running: false
        onExited: exitCode => {
            root.cavaAvailable = exitCode === 0;
        }
    }

    Component.onCompleted: {
        cavaCheck.running = true;
    }

    Process {
        id: cavaProcess

        running: root.cavaAvailable && root.refCount > 0
        command: ["sh", "-c", "printf '[general]\\nframerate=25\\nbars=6\\nautosens=0\\nsensitivity=30\\nlower_cutoff_freq=50\\nhigher_cutoff_freq=12000\\n[input]\\nmethod=pipewire\\nsource=auto\\nsample_rate=48000\\n[output]\\nmethod=raw\\nraw_target=/dev/stdout\\ndata_format=ascii\\nchannels=mono\\nmono_option=average\\n[smoothing]\\nnoise_reduction=35\\nintegral=90\\ngravity=95\\nignore=2\\nmonstercat=1.5' | cava -p /dev/stdin"]

        onRunningChanged: {
            if (!running) {
                root.values = Array(6).fill(0);
            }
        }

        stdout: SplitParser {
            splitMarker: "\n"
            onRead: data => {
                if (root.refCount > 0 && data.length > 0) {
                    const parts = data.split(";");
                    if (parts.length >= 6) {
                        const points = [parseInt(parts[0], 10), parseInt(parts[1], 10), parseInt(parts[2], 10), parseInt(parts[3], 10), parseInt(parts[4], 10), parseInt(parts[5], 10)];
                        root.values = points;
                    }
                }
            }
        }
    }
}