noctalia-shell/Services/Media/CavaService.qml

pragma Singleton

import QtQuick
import Quickshell
import Quickshell.Io
import qs.Commons
import qs.Services.UI

Singleton {
  id: root

  /**
  * Cava runs if:
  *   - Bar has an audio visualizer
  *   - LockScreen is opened
  *   - A control center is open
  */
  property bool shouldRun: BarService.hasAudioVisualizer || PanelService.lockScreen?.active || (PanelService.openedPanel && PanelService.openedPanel.panelWrapper.objectName.startsWith("controlCenterPanel"))

  property var values: Array(barsCount).fill(0)
  property int barsCount: 32

  // Idle detection to reduce GPU usage when there's no audio
  property bool isIdle: true
  property int idleFrameCount: 0
  readonly property int idleThreshold: 30 // Frames of silence before considered idle (0.5s at 60fps)

  // Simple config
  property var config: ({
                          "general": {
                            "bars": barsCount,
                            "framerate": Settings.data.audio.cavaFrameRate,
                            "autosens": 1,
                            "sensitivity": 100,
                            "lower_cutoff_freq": 50,
                            "higher_cutoff_freq": 12000
                          },
                          "smoothing": {
                            "monstercat": 1,
                            "noise_reduction"// Enable monstercat smoothing for less jittery animation
                            : 77
                          },
                          "output": {
                            "method": "raw",
                            "data_format": "ascii",
                            "ascii_max_range": 100,
                            "bit_format": "8bit",
                            "channels": "mono",
                            "mono_option": "average"
                          }
                        })

  Process {
    id: process
    stdinEnabled: true
    running: root.shouldRun
    command: ["cava", "-p", "/dev/stdin"]
    onRunningChanged: {
      Logger.d("Cava", "Process running:", running);
    }
    onExited: {
      Logger.d("Cava", "Process exited");
      stdinEnabled = true;
      values = Array(barsCount).fill(0);
    }
    onStarted: {
      Logger.d("Cava", "Process started");
      for (const k in config) {
        if (typeof config[k] !== "object") {
          write(k + "=" + config[k] + "\n");
          continue;
        }
        write("[" + k + "]\n");
        const obj = config[k];
        for (const k2 in obj) {
          write(k2 + "=" + obj[k2] + "\n");
        }
      }
      stdinEnabled = false;
      values = Array(barsCount).fill(0);
    }
    stdout: SplitParser {
      onRead: data => {
        const newValues = data.slice(0, -1).split(";").map(v => parseInt(v, 10) / 100);

        // Check if all values are effectively zero (< 0.01)
        const allZero = newValues.every(v => v < 0.01);

        if (allZero) {
          root.idleFrameCount++;
          if (root.idleFrameCount >= root.idleThreshold) {
            // We're idle - stop updating values to save GPU
            if (!root.isIdle) {
              root.isIdle = true;
              // Set all values to 0 one final time
              root.values = Array(root.barsCount).fill(0);
              Logger.d("Cava", "Idle detected - stopped rendering");
            }
            // Don't update values while idle
            return;
          }
        } else {
          // Audio detected - resume updates
          root.idleFrameCount = 0;
          if (root.isIdle) {
            root.isIdle = false;
            Logger.d("Cava", "Audio detected - resumed rendering");
          }
        }

        // Update values only if there's a significant change
        if (!isIdle) {
          root.values = newValues;
        }
      }
    }
    stderr: StdioCollector {
      onStreamFinished: {
        if (text.trim()) {
          Logger.w("Cava", "Error", text);
        }
      }
    }
  }
}