Massively improve audio stability on Mac

.gitignore

@@ -2,6 +2,7 @@
 /.idea
 osci-render.iml
 *.osci
+*.log
 
 # ignore temporary files
 *~

src/main/java/sh/ball/audio/engine/JavaAudioEngine.java

@@ -47,28 +47,26 @@ public class JavaAudioEngine implements AudioEngine {
 
     // connects to a device that can support the format above (i.e. default audio device)
     this.source = AudioSystem.getSourceDataLine(format);
-    source.open(format);
 
     int bufferSize = calculateBufferSize(device, UNSTABLE_LATENCY_MS);
-    int remainingBufferSpace = source.getBufferSize() - bufferSize;
 
     byte[] buffer = new byte[bufferSize * 2];
 
+    source.open(format, buffer.length);
+
     source.start();
     while (!stopped) {
       if (makeMoreStable || makeLessStable) {
         int newLatency = makeMoreStable ? STABLE_LATENCY_MS : UNSTABLE_LATENCY_MS;
         bufferSize = calculateBufferSize(device, newLatency);
-        remainingBufferSpace = source.getBufferSize() - bufferSize;
 
         buffer = new byte[bufferSize * 2];
         isStable = makeMoreStable;
         makeMoreStable = false;
         makeLessStable = false;
       }
-      int delta = source.available() - remainingBufferSpace;
+
-      if (delta > 0) {
+      int requiredSamples = bufferSize / FRAME_SIZE;
-        int requiredSamples = (delta + bufferSize) / FRAME_SIZE;
 
       if (requiredSamples * NUM_CHANNELS > buffer.length / 2) {
         buffer = new byte[requiredSamples * NUM_CHANNELS * 2];
@@ -92,7 +90,6 @@ public class JavaAudioEngine implements AudioEngine {
 
       source.write(buffer, 0, requiredSamples * FRAME_SIZE);
     }
-    }
     source.stop();
     this.device = null;
   }

src/main/java/sh/ball/gui/Gui.java

@@ -39,7 +39,6 @@ public class Gui extends Application {
 
   @Override
   public void start(Stage stage) throws Exception {
-    Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
     System.setProperty("prism.lcdtext", "false");
 
     FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/main.fxml"));