From 42a23312a0621b762c6a0d138915ba02065db241 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <carl@carlh.net>
Date: Fri, 24 Sep 2010 14:05:20 +0000
Subject: Slightly hacky but functional fix for large quantities of MIDI output
 when interpolating sharp changes in controller value.  Fixes #3476.

git-svn-id: svn://localhost/ardour2/branches/3.0@7840 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/evoral/src/Sequence.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'libs/evoral')

diff --git a/libs/evoral/src/Sequence.cpp b/libs/evoral/src/Sequence.cpp
index 36758c3274..b6a7dceca1 100644
--- a/libs/evoral/src/Sequence.cpp
+++ b/libs/evoral/src/Sequence.cpp
@@ -39,6 +39,16 @@
 using namespace std;
 using namespace PBD;
 
+/** Minimum time between MIDI outputs from a single controller,
+    expressed in beats.  This is to limit the rate at which MIDI messages
+    are generated, particularly for quickly-changing controllers which
+    are being interpolated.
+
+    XXX: This is a hack.  The time should probably be expressed in
+    seconds rather than beats, and should be configurable etc. etc.
+*/
+static double const time_between_controller_outputs = 1.0 / 256;
+
 namespace Evoral {
 
 // Read iterator (const_iterator)
@@ -253,9 +263,9 @@ Sequence<Time>::const_iterator::operator++()
 	case CONTROL:
 		// Increment current controller iterator
 		if (_force_discrete) {
-			ret = _control_iter->list->rt_safe_earliest_event_discrete_unlocked (_control_iter->x, x, y, false);
+			ret = _control_iter->list->rt_safe_earliest_event_discrete_unlocked (_control_iter->x + time_between_controller_outputs, x, y, false);
 		} else {
-			ret = _control_iter->list->rt_safe_earliest_event_unlocked (_control_iter->x, x, y, false);
+			ret = _control_iter->list->rt_safe_earliest_event_unlocked (_control_iter->x + time_between_controller_outputs, x, y, false);
 		}
 		assert(!ret || x > _control_iter->x);
 		if (ret) {
-- 
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