From 0ff1cc19018c34dcc37ec1eb16e23d1c443e9e0d Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Mon, 21 Aug 2023 03:41:08 -0400
Subject: [PATCH] Add warning when an out-of-order message is sent to
 midi::InputQueue.

---
 src/midi.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/midi.cpp b/src/midi.cpp
index 92a71617..96fc8629 100644
--- a/src/midi.cpp
+++ b/src/midi.cpp
@@ -307,8 +307,12 @@ void InputQueue::onMessage(const Message& message) {
 	if (internal->queue.size() >= InputQueue_maxSize)
 		return;
 	// Message timestamp must be monotonically increasing, otherwise clear the queue.
-	if (!internal->queue.empty() && message.getFrame() < internal->queue.back().getFrame()) {
-		internal->queue.clear();
+	if (!internal->queue.empty()) {
+		const Message& lastMessage = internal->queue.back();
+		if (message.getFrame() < lastMessage.getFrame()) {
+			WARN("MIDI message at frame %lld added to InputQueue after later message at frame %lld", (long long) message.getFrame(), (long long) lastMessage.getFrame());
+			internal->queue.clear();
+		}
 	}
 	// Push to queue
 	internal->queue.push_back(message);