javafx.scene.media

## Interface AudioSpectrumListener

-     public interface AudioSpectrumListener

  Audio spectrum callback interface. The observer receives periodic updates of the audio spectrum. A single observer may be attached to a given `MediaPlayer` using `MediaPlayer.setAudioSpectrumListener(javafx.scene.media.AudioSpectrumListener)`.
  Since:
    JavaFX 2.0
  See Also:
    `MediaPlayer`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases)` Notifies the observer about new data available for the audio spectrum.

- - ### Method Detail

    - #### spectrumDataUpdate

          void spectrumDataUpdate(double timestamp,
                                  double duration,
                                  float[] magnitudes,
                                  float[] phases)

      Notifies the observer about new data available for the audio spectrum.

      The notification period for updates may be set using `MediaPlayer.setAudioSpectrumInterval(double)`, and the number of bands and sensitivity threshold via `MediaPlayer.setAudioSpectrumNumBands(int)` and `MediaPlayer.setAudioSpectrumThreshold(int)`, respectively. The default values of the settings are an interval of `0.1` seconds, `128` bands, and sensitivity threshold `-60.0` dB.

      The arrays passed to the listener should be considered to be read-only as the underlying implementation may re-use them.

      Parameters:
        `timestamp` - timestamp of the event in seconds.
        `duration` - duration for which the spectrum was computed in seconds.
        `magnitudes` - array containing the non-positive spectrum magnitude in decibels (dB) for each band. The size of the array equals the number of bands and should be considered to be read-only.
        `phases` - array containing the phase in the range [`Math.PI`, `Math.PI`] for each band. The size of the array equals the number of bands and should be considered to be read-only.

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