Add and use dB/linear conversion functions.

[dcpomatic.git] / src / wx / audio_gain_dialog.cc

diff --git a/src/wx/audio_gain_dialog.cc b/src/wx/audio_gain_dialog.cc
index 72b3f86ca94bc77f1aa551de9b66955b8395ecf7..5cd936d2439fb9bb4f0807b678cc0a0e56291a8d 100644 (file)
--- a/src/wx/audio_gain_dialog.cc
+++ b/src/wx/audio_gain_dialog.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2014-2020 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -18,10 +18,11 @@
 
 */
 
-#include <cmath>
-#include <wx/spinctrl.h>
 #include "audio_gain_dialog.h"
 #include "wx_util.h"
+#include "lib/util.h"
+#include <cmath>
+#include <wx/spinctrl.h>
 
 AudioGainDialog::AudioGainDialog (wxWindow* parent, int c, int d, float v)
        : TableDialog (parent, _("Channel gain"), 3, 1, true)
@@ -34,7 +35,7 @@ AudioGainDialog::AudioGainDialog (wxWindow* parent, int c, int d, float v)
        _gain->SetDigits (1);
        _gain->SetIncrement (0.1);
 
-       _gain->SetValue (20 * log10 (v));
+       _gain->SetValue (linear_to_db(v));
 
        layout ();
 }
@@ -46,5 +47,5 @@ AudioGainDialog::value () const
                return 0;
        }
 
-       return pow (10, _gain->GetValue () / 20);
+       return db_to_linear (_gain->GetValue());
 }