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!7

cmodule AudioClip > DynSCP {
  File audioFile;
  transient JAmplitudeGraph graph;
  transient float[] volumeProfile;
  double windowSize = 0.01; // seconds
  
  JComponent visualize2() {
    ret withComputing(r updateGraph, graph = swingNu JAmplitudeGraph());
  }

  void updateGraph enter {
    if (!isFile(audioFile))
      ret with setComponent(jcenteredbutton("Open audio file...", rThread openFile));
    setComponent(graph);
    if (volumeProfile == null)
      volumeProfile = decodeWAVToMonoSamples_floatVolumeProfile(audioFile, windowSize);
    graph?.setValues(volumeProfile);
  }
  
  void updateProfile enter {
    volumeProfile = null;
    updateGraph();
  }
  
  void openFile enter {
    loadFile(showFileChooser());
  }
  
  void loadFile(File f) {
    audioFile = f;
    updateProfile();
  }
}