From ac8142bae4cbac6b45b5f206d439151389d1e799 Mon Sep 17 00:00:00 2001
From: Chris Flesner <chris@mixedinkey.com>
Date: Thu, 17 Mar 2016 17:27:18 -0500
Subject: [PATCH] Added maximumLookAheadInterval property to MIKMIDISequencer

---
 Source/MIKMIDISequencer.h | 9 +++++++++
 Source/MIKMIDISequencer.m | 8 +++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Source/MIKMIDISequencer.h b/Source/MIKMIDISequencer.h
index 470a27d0..790212d3 100644
--- a/Source/MIKMIDISequencer.h
+++ b/Source/MIKMIDISequencer.h
@@ -414,6 +414,15 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @property (nonatomic, readonly) MIDITimeStamp latestScheduledMIDITimeStamp;
 
+
+/**
+ *	The maximum amount the sequencer will look ahead to schedule MIDI events. (0.05 to 1s).
+ *
+ *	The default of 0.1s should suffice for most uses. You may however, need a longer time
+ *	if your sequencer needs to playback on iOS while the device is locked.
+ */
+@property (nonatomic) NSTimeInterval maximumLookAheadInterval;
+
 #pragma mark - Deprecated
 
 /**
diff --git a/Source/MIKMIDISequencer.m b/Source/MIKMIDISequencer.m
index 06a40b0e..91a21a43 100644
--- a/Source/MIKMIDISequencer.m
+++ b/Source/MIKMIDISequencer.m
@@ -115,6 +115,7 @@ - (instancetype)initWithSequence:(MIKMIDISequence *)sequence
 		_createSynthsIfNeeded = YES;
 		_processingQueueKey = &_processingQueueKey;
 		_processingQueueContext = &_processingQueueContext;
+		_maximumLookAheadInterval = 0.1;
 	}
 	return self;
 }
@@ -275,7 +276,7 @@ - (void)stopWithDispatchToProcessingQueue:(BOOL)dispatchToProcessingQueue
 
 - (void)processSequenceStartingFromMIDITimeStamp:(MIDITimeStamp)fromMIDITimeStamp
 {
-	MIDITimeStamp toMIDITimeStamp = MIKMIDIGetCurrentTimeStamp() + MIKMIDIClockMIDITimeStampsPerTimeInterval(0.1);
+	MIDITimeStamp toMIDITimeStamp = MIKMIDIGetCurrentTimeStamp() + MIKMIDIClockMIDITimeStampsPerTimeInterval(self.maximumLookAheadInterval);
 	if (toMIDITimeStamp < fromMIDITimeStamp) return;
 	MIKMIDIClock *clock = self.clock;
 
@@ -820,6 +821,11 @@ - (void)setSequence:(MIKMIDISequence *)sequence
 	}
 }
 
+- (void)setMaximumLookAheadInterval:(NSTimeInterval)maximumLookAheadInterval
+{
+	_maximumLookAheadInterval = MIN(MAX(maximumLookAheadInterval, 0.05), 1.0);
+}
+
 #pragma mark - Deprecated
 
 - (void)setDestinationEndpoint:(MIKMIDIDestinationEndpoint *)endpoint forTrack:(MIKMIDITrack *)track