change handling of MIDI gain so that we present a linear fader spanning 0..127. this is based on the realization that we actually have no idea what the MIDI receiver will do with velocity and/or CC #7 values, and so trying to pretend that we can provide some kind of dB value in the display or the behaviour of the fader is completely wrong; ALSO: fix keyboard entry of fader levels for non EN locales (#5027)

git-svn-id: svn://localhost/ardour2/branches/3.0@13480 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 11 insertions, 1 deletions

diff --git a/libs/ardour/ardour/amp.h b/libs/ardour/ardour/amp.h
index 46dbdba227..dcffb1bcdb 100644
--- a/libs/ardour/ardour/amp.h
+++ b/libs/ardour/ardour/amp.h
@@ -102,7 +102,17 @@ public:
 	}
 
 	std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
-	
+
+        static const float max_gain_coefficient;
+
+        inline static float gain_coefficient_to_midi_velocity_factor (gain_t v) { 
+		return (v/max_gain_coefficient);
+	}
+
+        inline static gain_t midi_velocity_factor_to_gain_coefficient (float v) {
+		return v * max_gain_coefficient;
+	}
+
 private:
 	bool   _denormal_protection;
 	bool   _apply_gain;