fixed: crash from invalid buffer positioning, error from shutting thread

down before instantiation; removed old code;

desktop/src/zero1hd/rhythmbullet/desktop/audio/PCMObtainer.java

@@ -110,9 +110,9 @@ public class PCMObtainer implements Observer, PCMSystem {
 
 	private boolean synchronizeBufferWithPlayback() {
 		int bufferPos = calcBufferPosition();
-		if (bufferPos <= playingBuffer.limit()) {
+		if (bufferPos < playingBuffer.limit() || bufferPos >= 0) {
 			synchronized (this) {
-				playingBuffer.position(calcBufferPosition());
+				playingBuffer.position(bufferPos);
 				windowsRead = (int) ((mc.getCurrentPosition() * sampleRate) / windowSize);
 				return true;
 			}

desktop/src/zero1hd/rhythmbullet/desktop/screens/main/MainPage.java

@@ -7,6 +7,7 @@ import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.assets.AssetManager;
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.math.Vector3;
 import com.badlogic.gdx.scenes.scene2d.Actor;
 import com.badlogic.gdx.scenes.scene2d.ui.Image;
 import com.badlogic.gdx.scenes.scene2d.ui.Label;
@@ -121,6 +122,12 @@ public class MainPage extends Page implements Observer {
 		super.dispose();
 	}
 	
+	@Override
+	public void setCameraPositionToPage(Vector3 cameraPosition) {
+		getStage().setScrollFocus(null);
+		super.setCameraPositionToPage(cameraPosition);
+	}
+	
 	@Override
 	public void update(Observable o, Object arg) {
 		if (o == mc) {

desktop/src/zero1hd/rhythmbullet/desktop/screens/main/MainScreen.java

@@ -49,7 +49,6 @@ public class MainScreen extends ScreenAdapter implements ResizeReadyScreen {
 	
 	private Batch screenBatch;
 	
-	private float targetDelta;
 	public MainScreen(RhythmBullet core) {
 		this.rhythmBullet = core;
 		stage = new Stage(new ScreenViewport());
@@ -63,7 +62,6 @@ public class MainScreen extends ScreenAdapter implements ResizeReadyScreen {
 		
 		listeners = new Listeners();
 		screenBatch = new SpriteBatch();
-		targetDelta = 1f/core.getScreenConfiguration().getTargetFramesPerSecond();
 	}
 	
 	@Override
@@ -80,7 +78,7 @@ public class MainScreen extends ScreenAdapter implements ResizeReadyScreen {
 		}
 
 		if (stage.getCamera().position.x != cameraPosition.x || stage.getCamera().position.y != cameraPosition.y) {
-			stage.getCamera().position.lerp(cameraPosition, targetDelta*lerpAlpha);
+			stage.getCamera().position.lerp(cameraPosition, 0.15f);
 			stage.getViewport().apply();
 		}
 		
@@ -144,7 +142,6 @@ public class MainScreen extends ScreenAdapter implements ResizeReadyScreen {
 	@Override
 	public void show() {
 		Gdx.input.setInputProcessor(stage);
-		calcLerpAlpha(Gdx.graphics.getWidth());
 		super.show();
 	}
 	
@@ -167,7 +164,6 @@ public class MainScreen extends ScreenAdapter implements ResizeReadyScreen {
 		stage.getViewport().update(width, height, false);
 		cameraPosition.x = width/2;
 		cameraPosition.y = height/2;
-		calcLerpAlpha(width);
 		super.resize(width, height);
 	}
 	
@@ -180,14 +176,6 @@ public class MainScreen extends ScreenAdapter implements ResizeReadyScreen {
 		super.dispose();
 	}
 	
-	private void calcLerpAlpha(int width) {
-		if (width <= 3835) {
-			lerpAlpha = 5.0f;
-		} else {
-			lerpAlpha = 5.5f;
-		}
-	}
-	
 	public void setDisplayedPage(Page page) {
 		page.setCameraPositionToPage(cameraPosition);
 	}

desktop/src/zero1hd/rhythmbullet/desktop/screens/main/MusicSelectionPage.java

@@ -62,6 +62,7 @@ public class MusicSelectionPage extends Page implements Observer {
 	
 	private float scrollTimer, scrollDelay = 0.2f, scrollDelMod, songSelectionTimer;
 	private float musicSelectDelay;
+	
 	public MusicSelectionPage(AssetManager assetManager, Skin skin, MusicController musicController, AudioMetadataController musicMetadataController, ChangeListener backButtonListener, ChangeListener beginButtonListener) {
 		super(1, 0);
 		this.assets = assetManager;
@@ -289,7 +290,9 @@ public class MusicSelectionPage extends Page implements Observer {
 		
 		public void stop() {
 			clear();
-			thread.interrupt();
+			if (thread != null) {
+				thread.interrupt();
+			}
 			work = false;
 		}