Added maximumLookAheadInterval property to MIKMIDISequencer

mixedinkey-opensource · Mar 17, 2016 · ac8142b · ac8142b
1 parent c4956d9
commit ac8142b
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Showing 2 changed files with 16 additions and 1 deletion.
diff --git 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
@@ -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