1 files changed, 34 insertions, 0 deletions
diff --git a/libs/ardour/ardour/dB.h b/libs/ardour/ardour/dB.h
new file mode 100644
index 0000000000..703de6fb1a
--- /dev/null
+++ b/libs/ardour/ardour/dB.h
@@ -0,0 +1,34 @@
+/*
+    Copyright (C) 2001 Paul Davis 
+
+    This program 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.
+
+    This program 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 this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#ifndef __ardour_dB_h__
+#define __ardour_dB_h__
+
+#include <pbd/fastlog.h>
+
+static inline float dB_to_coefficient (float dB) {
+	return dB > -318.8f ? pow (10.0f, dB * 0.05f) : 0.0f;
+}
+
+static inline float coefficient_to_dB (float coeff) {
+	return 20.0f * fast_log10 (coeff);
+}
+
+#endif /* __ardour_dB_h__ */