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gst/equalizer/gstiirequalizer.c: Document parameter mapping.

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Original commit message from CVS:
* gst/equalizer/gstiirequalizer.c:
Document parameter mapping.
This commit is contained in:
Stefan Kost 2007-06-20 10:15:00 +00:00
parent 3dbc3b7ad1
commit 7619871a05
2 changed files with 16 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2007-06-20 Stefan Kost <ensonic@users.sf.net>
* gst/equalizer/gstiirequalizer.c:
Document parameter mapping.
2007-06-20 Stefan Kost <ensonic@users.sf.net> 2007-06-20 Stefan Kost <ensonic@users.sf.net>
* gst/spectrum/gstspectrum.c: (gst_spectrum_event), * gst/spectrum/gstspectrum.c: (gst_spectrum_event),

14
gst/equalizer/gstiirequalizer.c
View file

@ -311,9 +311,17 @@ gst_iir_equalizer_finalize (GObject * object)
G_OBJECT_CLASS (parent_class)->finalize (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 * converts gain values to scale factors.
* f(x) = 0.25 * 5 ^ x - 0.25 *
* 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 static gdouble
arg_to_scale (gdouble arg) arg_to_scale (gdouble arg)