user-interface.c

gboolean handle_element (GstBus *bus, GstMessage *msg, UserInterface *ui)
{
  const GstStructure *s= gst_message_get_structure (msg);
  guint band;
  const GValue *magnitudes;

  if (gst_structure_has_name (s, "spectrum"))
    {
      magnitudes = gst_structure_get_value (s, "magnitude");
      gfloat *m;

      for (band = 0; band < 128; ++band)
        {
          m = &g_array_index (ui->spectrum_magnitudes, gfloat, band);
          *m = g_value_get_float (gst_value_list_get_value (magnitudes, band));
        }
    }

  g_debug ("%f", g_array_index (ui->spectrum_magnitudes, gfloat, 1));

  return TRUE;
}