Correctly initialise audio player when rendering from a sample source

src/main/java/sh/ball/audio/ShapeAudioPlayer.java

@@ -345,9 +345,11 @@ public class ShapeAudioPlayer implements AudioPlayer<List<Shape>> {
   @Override
   public void run() {
     try {
-      frame = frameQueue.take();
-      frameLength = Shape.totalLength(frame);
-      updateLengthIncrement();
+      if (sampleSource == null) {
+        frame = frameQueue.take();
+        frameLength = Shape.totalLength(frame);
+        updateLengthIncrement();
+      }
     } catch (InterruptedException e) {
       throw new RuntimeException("Initial frame not found. Cannot continue.");
     }

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

@@ -104,7 +104,7 @@ public class ConglomerateAudioEngine implements AudioEngine {
   // potentially blocking on a buffer.
   private static class BufferedChannelGenerator implements Callable<Vector2>, Runnable {
 
-    private static final int BLOCK_SIZE = 4096;
+    private static final int BLOCK_SIZE = 1024;
     private static final int BUFFER_SIZE = 2;
 
     private final ArrayBlockingQueue<Vector2[]> buffer;

src/main/java/sh/ball/gui/controller/MainController.java

@@ -684,12 +684,11 @@ public class MainController implements Initializable, FrequencyListener, MidiLis
     }
     effectsController.restartEffects();
 
-    generalController.setFrameSourceName(frameSourcePaths.get(currentFrameSource));
-    generalController.updateFrameLabels();
-
     String fileName = frameSourcePaths.get(index);
 
     Platform.runLater(() -> {
+      generalController.setFrameSourceName(frameSourcePaths.get(currentFrameSource));
+      generalController.updateFrameLabels();
       if (ObjParser.isObjFile(fileName)) {
         objTitledPane.setVisible(true);
         objTitledPane.setDisable(false);