From 422309880c0448d95c7be2cec43384b604fa427c Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sun, 28 Nov 2010 18:29:21 +0000
Subject: [PATCH] avoid delivering NaN's when setting up a generic plugin UI

git-svn-id: svn://localhost/ardour2/branches/3.0@8116 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 gtk2_ardour/generic_pluginui.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/generic_pluginui.cc b/gtk2_ardour/generic_pluginui.cc
index ca9fd27149..99969e1b61 100644
--- a/gtk2_ardour/generic_pluginui.cc
+++ b/gtk2_ardour/generic_pluginui.cc
@@ -527,7 +527,12 @@ GenericPluginUI::build_control_ui (guint32 port_index, boost::shared_ptr<Automat
 		}
 
 		if (control_ui->logarithmic) {
-			adj->set_value(log(plugin->get_parameter(port_index)));
+                        double val = plugin->get_parameter (port_index);
+                        if (isnan (val) || val <= 0.0) {
+                                adj->set_value (0.0);
+                        } else {
+                                adj->set_value (log(val));
+                        }
 		} else{
 			adj->set_value(plugin->get_parameter(port_index));
 		}