From e6ab5e1803c5489acf9c2e0cbcce02903a043b1e Mon Sep 17 00:00:00 2001
From: Stephane Letz <letz@grame.fr>
Date: Fri, 3 Aug 2012 08:20:44 +0200
Subject: [PATCH] Devin Anderson patch for Jack/CoreMIDI duplicated messages.

---
 macosx/coremidi/JackCoreMidiOutputPort.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/macosx/coremidi/JackCoreMidiOutputPort.cpp b/macosx/coremidi/JackCoreMidiOutputPort.cpp
index a5266dee..9fcee2a4 100644
--- a/macosx/coremidi/JackCoreMidiOutputPort.cpp
+++ b/macosx/coremidi/JackCoreMidiOutputPort.cpp
@@ -81,7 +81,11 @@ JackCoreMidiOutputPort::Execute()
         packet = MIDIPacketListAdd(packet_list, PACKET_BUFFER_SIZE, packet,
                                    timestamp, size, data);
         if (packet) {
-            while (GetMicroSeconds() < send_time) {
+            do {
+                if (GetMicroSeconds() >= send_time) {
+                    event = 0;
+                    break;
+                }
                 event = GetCoreMidiEvent(false);
                 if (! event) {
                     break;
@@ -90,10 +94,7 @@ JackCoreMidiOutputPort::Execute()
                                            packet,
                                            GetTimeStampFromFrames(event->time),
                                            event->size, event->buffer);
-                if (! packet) {
-                    break;
-                }
-            }
+            } while (packet);
             SendPacketList(packet_list);
         } else {