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-rw-r--r--gst/equalizer/gstiirequalizer.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/gst/equalizer/gstiirequalizer.c b/gst/equalizer/gstiirequalizer.c
index 926b1e0a..ff11c9e7 100644
--- a/gst/equalizer/gstiirequalizer.c
+++ b/gst/equalizer/gstiirequalizer.c
@@ -311,9 +311,17 @@ gst_iir_equalizer_finalize (GObject * object)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
-/* args are in the range [-1 ... 1] with 0 meaning "no action"
- * convert to [-0.2 ... 1] with 0 meaning no action via the function
- * f(x) = 0.25 * 5 ^ x - 0.25
+/*
+ * converts gain values to scale factors.
+ *
+ * arguments are in the range [-1 ... 1] with 0 meaning "no action"
+ * results are in the range [-0.2 ... 1] with 0 meaning "no action"
+ * via the function
+ * f(x) = 0.25 * 5 ^ x - 0.25
+ *
+ * visualize via gnuplot:
+ * set xrange [-1:1]
+ * plot 0.25 * exp (log (5) * x) - 0.25
*/
static gdouble
arg_to_scale (gdouble arg)