From bcc4e2f7dc4cd5658e199ddacb7202b00ec72cf1 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Thu, 27 Feb 2020 22:26:57 +0100
Subject: Add and use dB/linear conversion functions.

---
 src/lib/util.cc | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'src/lib/util.cc')

diff --git a/src/lib/util.cc b/src/lib/util.cc
index bbb444367..e4f552c4d 100644
--- a/src/lib/util.cc
+++ b/src/lib/util.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012-2019 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2020 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -1171,3 +1171,16 @@ write_swaroop_chain (shared_ptr<const dcp::CertificateChain> chain, boost::files
 }
 
 #endif
+
+double
+db_to_linear (double db)
+{
+	return pow(10, db / 20);
+}
+
+double
+linear_to_db (double linear)
+{
+	return 20 * log10(linear);
+}
+
-- 
cgit v1.2.3