Display amp automation in dB using a logarithmic fader.

git-svn-id: svn://localhost/ardour2/branches/3.0@11535 d708f5d6-7413-0410-9779-e7cbd77b26cf

2 files changed, 15 insertions, 0 deletions

diff --git a/libs/ardour/amp.cc b/libs/ardour/amp.cc
index b038cde695..b74a57dbce 100644
--- a/libs/ardour/amp.cc
+++ b/libs/ardour/amp.cc
@@ -458,3 +458,16 @@ Amp::visible() const
 {
 	return true;
 }
+
+std::string
+Amp::value_as_string (boost::shared_ptr<AutomationControl> ac) const
+{
+	if (ac == _gain_control) {
+		char buffer[32];
+		snprintf (buffer, sizeof (buffer), "%.2fdB", ac->internal_to_user (ac->get_value ()));
+		return buffer;
+	}
+
+	return Automatable::value_as_string (ac);
+}
+	
diff --git a/libs/ardour/ardour/amp.h b/libs/ardour/ardour/amp.h
index 398d43ee3e..fa2eb98ebf 100644
--- a/libs/ardour/ardour/amp.h
+++ b/libs/ardour/ardour/amp.h
@@ -98,6 +98,8 @@ public:
 		return _gain_control;
 	}
 
+	std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
+	
 private:
 	bool   _denormal_protection;
 	bool   _apply_gain;