spectrum

struct MetaAudioSpectrum {
  GstMeta meta;

  /* data representation */
  gint16 bands;			/* how many bands are represented */
  gint8 channels;		/* how many audio channels are there? */
  gboolean interleaved;		/* are the channels interleaved? */

  /* spectrum details */
  gint16 lowfreq;
  gint16 highfreq;
  gint16 steps;
};