Reintroduces CSMachineDelegate, allowing the Mac port to switch output audio rate dynamically.

OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift

@@ -12,6 +12,7 @@ import AudioToolbox
 class MachineDocument:
 	NSDocument,
 	NSWindowDelegate,
+	CSMachineDelegate,
 	CSOpenGLViewDelegate,
 	CSOpenGLViewResponderDelegate,
 	CSBestEffortUpdaterDelegate,
@@ -55,6 +56,7 @@ class MachineDocument:
 			self.machine.setView(self.openGLView, aspectRatio: Float(displayAspectRatio.width / displayAspectRatio.height))
 		})
 
+		self.machine.delegate = self
 		self.bestEffortUpdater = CSBestEffortUpdater()
 
 		// callbacks from the OpenGL may come on a different thread, immediately following the .delegate set;
@@ -72,6 +74,10 @@ class MachineDocument:
 		self.bestEffortUpdater!.delegate = self
 	}
 
+	func machineSpeakerDidChangeInputClock(_ machine: CSMachine!) {
+		setupClockRate()
+	}
+
 	fileprivate func setupClockRate() {
 		// establish and provide the audio queue, taking advice as to an appropriate sampling rate
 		let maximumSamplingRate = CSAudioQueue.preferredSamplingRate()

OSBindings/Mac/Clock Signal/Machine/CSMachine.h

@@ -14,6 +14,9 @@
 #import "CSStaticAnalyser.h"
 
 @class CSMachine;
+@protocol CSMachineDelegate
+- (void)machineSpeakerDidChangeInputClock:(CSMachine *)machine;
+@end
 
 // Deliberately low; to ensure CSMachine has been declared as an @class already.
 #import "CSAtari2600.h"
@@ -42,6 +45,7 @@
 
 @property (nonatomic, strong) CSAudioQueue *audioQueue;
 @property (nonatomic, readonly) CSOpenGLView *view;
+@property (nonatomic, weak) id<CSMachineDelegate> delegate;
 
 @property (nonatomic, readonly) NSString *userDefaultsPrefix;
 

OSBindings/Mac/Clock Signal/Machine/CSMachine.mm

@@ -78,7 +78,7 @@ struct SpeakerDelegate: public Outputs::Speaker::Speaker::Delegate, public LockP
 }
 
 - (void)speakerDidChangeInputClock:(Outputs::Speaker::Speaker *)speaker {
-	// TODO: consider changing output audio queue rate.
+	[self.delegate machineSpeakerDidChangeInputClock:self];
 }
 
 - (void)dealloc {