Cocoa Port:

- Fix a longstanding bug where audio frames were accidentally getting dropped when using N-sync and Z-sync methods. Greatly improves the audio quality of the N-sync method.
- Now that N-sync actually works as intended, it is now the default sync method. (N-sync has much better latency compared to the other sync methods, especially compared to P-sync, which was the previous default.)
- Update sync method tooltips to better reflect their actual behavior.
- Fix UI bug where the Advanced SPU Logic control text would get truncated on OS X Yosemite.

desmume/src/cocoa/DefaultUserPrefs.plist

@@ -735,7 +735,7 @@
 	<key>SPU_InterpolationMode</key>
 	<integer>2</integer>
 	<key>SPU_SyncMethod</key>
-	<integer>2</integer>
+	<integer>0</integer>
 	<key>SPU_SyncMode</key>
 	<integer>1</integer>
 </dict>

desmume/src/cocoa/cocoa_globals.h

@@ -224,7 +224,7 @@
 #define FRAME_SKIP_BIAS								0.1		// May be any real number. This value acts as a vector addition to the frame skip.
 #define MAX_FRAME_SKIP								(DS_FRAMES_PER_SECOND / 3.0)
 
-#define SPU_SAMPLE_RATE								44100.0	// Samples per second
+#define SPU_SAMPLE_RATE								(44100.0 * DS_FRAMES_PER_SECOND / 60.0)	// Samples per second
 #define SPU_SAMPLE_RESOLUTION						16		// Bits per sample; must be a multiple of 8
 #define SPU_NUMBER_CHANNELS							2		// Number of channels
 #define SPU_SAMPLE_SIZE								((SPU_SAMPLE_RESOLUTION / 8) * SPU_NUMBER_CHANNELS) // Bytes per sample, multiplied by the number of channels

desmume/src/cocoa/sndOSX.cpp

@@ -52,7 +52,7 @@ SoundInterface_struct *SNDCoreList[] = {
 int SNDOSXInit(int buffer_size)
 {
 	CoreAudioOutput *oldcoreAudioPlaybackManager = coreAudioPlaybackManager;
-	coreAudioPlaybackManager = new CoreAudioOutput(buffer_size / SPU_SAMPLE_SIZE, SPU_SAMPLE_SIZE);
+	coreAudioPlaybackManager = new CoreAudioOutput(buffer_size * 4 / SPU_SAMPLE_SIZE, SPU_SAMPLE_SIZE);
 	delete oldcoreAudioPlaybackManager;
 	
 	if (mutexAudioSampleReadWrite == NULL)