!7

cmodule AudioClip > DynSCP {
  File audioFile;
  transient JAmplitudeGraph graph;
  transient float[] volumeProfile;
  double windowSize = 0.01; // seconds
  
  start {
    afterVisualize2(r updateGraph);
    graph = swingNu JAmplitudeGraph();
  }
  
  void updateGraph enter {
    if (!isFile(audioFile))
      ret with setComponent(jcenteredbutton("Open audio file...", rThread openFile));
    setComponent(northAndCenterWithMargin(
      jCenteredSection("File", dm_label audioFile()),
      jCenteredSection("Volume Profile", graph)));
    if (volumeProfile == null)
      volumeProfile = decodeWAVToMonoSamples_floatVolumeProfile(audioFile, windowSize);
    graph?.setValues(volumeProfile);
  }
  
  void updateProfile enter {
    volumeProfile = null;
    updateGraph();
  }
  
  void openFile enter {
    File f = showFileChooser();
    if (f != null) loadFile(f);
  }
  
  void loadFile(File f) {
    setField(audioFile := f);
    updateProfile();
  }
}