Cleanup: move some methods from util to maths_util.

[dcpomatic.git] / src / lib / maths_util.cc

diff --git a/src/lib/maths_util.cc b/src/lib/maths_util.cc
new file mode 100644 (file)
index 0000000..35e3879
--- /dev/null
+++ b/src/lib/maths_util.cc
@@ -0,0 +1,37 @@
+/*
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include <cmath>
+
+
+double
+db_to_linear (double db)
+{
+       return pow(10, db / 20);
+}
+
+
+double
+linear_to_db (double linear)
+{
+       return 20 * log10(linear);
+}
+