Implemented skinnable theme songs.

Plays a theme song when opsu! starts (can be disabled in options).  The default song is "welcome to osu!" by nekodex, uploaded by CyberKitsune.

To change the song, place a new "theme.osu" in the skins folder and edit the file name, metadata, and song length (at minimum).

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

CREDITS.md

@@ -27,3 +27,7 @@ The following projects were referenced in creating opsu!:
 * "Wojtkosu" - Wojtek Kowaluk (https://osu.ppy.sh/forum/t/97260)
 * "osu-parser" - nojhamster (https://github.com/nojhamster/osu-parser)
 * "osu! web" - pictuga (https://github.com/pictuga/osu-web)
+
+Theme Song
+----------
+The theme song is "welcome to osu!" by nekodex (https://soundcloud.com/nekodex).

res/theme.osu

@@ -0,0 +1,12 @@
+[General]
+// theme song file name (mp3/ogg supported)
+AudioFilename: theme.ogg
+
+[Metadata]
+// theme song title and artist
+Title:welcome to osu!
+Artist:nekodex
+
+[HitObjects]
+// length of theme song, in ms (third field)
+1,1,48000,1,0,0:0:0:0:

src/itdelatrisu/opsu/MusicController.java

@@ -22,6 +22,7 @@ import itdelatrisu.opsu.states.Options;
 
 import java.io.File;
 import java.lang.reflect.Field;
+import java.net.URL;
 import java.nio.IntBuffer;
 
 import javazoom.jl.converter.Converter;
@@ -34,6 +35,7 @@ import org.newdawn.slick.SlickException;
 import org.newdawn.slick.openal.Audio;
 import org.newdawn.slick.openal.SoundStore;
 import org.newdawn.slick.util.Log;
+import org.newdawn.slick.util.ResourceLoader;
 
 /**
  * Controller for all music.
@@ -59,6 +61,11 @@ public class MusicController {
 	 */
 	private static Thread trackLoader;
 
+	/**
+	 * Whether the theme song is currently playing.
+	 */
+	private static boolean themePlaying = false;
+
 	// This class should not be instantiated.
 	private MusicController() {}
 
@@ -70,6 +77,8 @@ public class MusicController {
 		boolean play = (lastOsu == null || !osu.audioFilename.equals(lastOsu.audioFilename));
 		lastOsu = osu;
 		if (play) {
+			themePlaying = false;
+
 			// TODO: properly interrupt instead of using deprecated Thread.stop();
 			// interrupt the conversion/track loading
 			if (isTrackLoading())
@@ -248,6 +257,30 @@ public class MusicController {
 		return (trackExists() && player.setPosition(position / 1000f));
 	}
 
+	/**
+	 * Plays the theme song.
+	 */
+	public static void playThemeSong() {
+		try {
+			URL themeURL = ResourceLoader.getResource(Options.OSU_THEME_NAME);
+			File themeFile = new File(themeURL.toURI());
+			OsuFile osu = OsuParser.parseFile(themeFile, null, false);
+			URL audioURL = ResourceLoader.getResource(osu.audioFilename.getName());
+			osu.audioFilename = new File(audioURL.toURI());
+			play(osu, true);
+			themePlaying = true;
+		} catch (Exception e) {
+			Log.error("Failed to load theme song.", e);
+		}
+	}
+
+	/**
+	 * Returns whether or not the current track, if any, is the theme song.
+	 */
+	public static boolean isThemePlaying() {
+		return (themePlaying && trackExists());
+	}
+
 	/**
 	 * Stops and releases all sources, clears each of the specified Audio
 	 * buffers, destroys the OpenAL context, and resets SoundStore for future use.

src/itdelatrisu/opsu/OsuParser.java

@@ -109,7 +109,7 @@ public class OsuParser {
 	 * @param parseObjects if true, hit objects will be fully parsed now
 	 * @return the new OsuFile object
 	 */
-	private static OsuFile parseFile(File file, ArrayList<OsuFile> osuFiles, boolean parseObjects) {
+	public static OsuFile parseFile(File file, ArrayList<OsuFile> osuFiles, boolean parseObjects) {
 		OsuFile osu = new OsuFile(file);
 
 		try (BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"))) {
@@ -464,7 +464,9 @@ public class OsuParser {
 			parseHitObjects(osu);
 
 		// add OsuFile to song group
+		if (osuFiles != null)
 			osuFiles.add(osu);
+
 		return osu;
 	}
 

src/itdelatrisu/opsu/states/MainMenu.java

@@ -293,11 +293,13 @@ public class MainMenu extends BasicGameState {
 			else if (!MusicController.isTrackLoading())
 				MusicController.resume();
 		} else if (musicNext.contains(x, y)) {
+			boolean isTheme = MusicController.isThemePlaying();
 			SongMenu menu = (SongMenu) game.getState(Opsu.STATE_SONGMENU);
 			OsuGroupNode node = menu.setFocus(Opsu.groups.getRandomNode(), -1, true);
-			if (node != null)
+			if (node != null && !isTheme)
 				previous.add(node.index);
-			if (Options.isDynamicBackgroundEnabled())
+			if (Options.isDynamicBackgroundEnabled() &&
+				MusicController.getOsuFile() != null && !MusicController.isThemePlaying())
 				bgAlpha = 0f;
 		} else if (musicPrevious.contains(x, y)) {
 			if (!previous.isEmpty()) {

src/itdelatrisu/opsu/states/Options.java

@@ -83,6 +83,11 @@ public class Options extends BasicGameState {
 	 */
 	public static final String FONT_NAME = "kochi-gothic.ttf";
 
+	/**
+	 * The theme song OsuFile file name.
+	 */
+	public static final String OSU_THEME_NAME = "theme.osu";
+
 	/**
 	 * The beatmap directory.
 	 */
@@ -134,7 +139,8 @@ public class Options extends BasicGameState {
 		DISABLE_SOUNDS,
 		KEY_LEFT,
 		KEY_RIGHT,
-		SHOW_UNICODE;
+		SHOW_UNICODE,
+		ENABLE_THEME_SONG;
 	};
 
 	/**
@@ -190,7 +196,8 @@ public class Options extends BasicGameState {
 		GameOption.EFFECT_VOLUME,
 		GameOption.HITSOUND_VOLUME,
 		GameOption.MUSIC_OFFSET,
-		GameOption.DISABLE_SOUNDS
+		GameOption.DISABLE_SOUNDS,
+		GameOption.ENABLE_THEME_SONG
 	};
 
 	/**
@@ -344,6 +351,11 @@ public class Options extends BasicGameState {
 	 */
 	private static boolean ignoreBeatmapSkins = false;
 
+	/**
+	 * Whether or not to play the theme song.
+	 */
+	private static boolean themeSongEnabled = true;
+
 	/**
 	 * Fixed difficulty overrides.
 	 */
@@ -631,6 +643,9 @@ public class Options extends BasicGameState {
 				}
 			}
 			break;
+		case ENABLE_THEME_SONG:
+			themeSongEnabled = !themeSongEnabled;
+			break;
 		default:
 			break;
 		}
@@ -938,6 +953,12 @@ public class Options extends BasicGameState {
 					"Press CTRL+L while playing to load a checkpoint, and CTRL+S to set one."
 			);
 			break;
+		case ENABLE_THEME_SONG:
+			drawOption(pos, "Enable Theme Song",
+					themeSongEnabled ? "Yes" : "No",
+					"Whether to play the theme song upon starting opsu!"
+			);
+			break;
 		default:
 			break;
 		}
@@ -1168,6 +1189,12 @@ public class Options extends BasicGameState {
 	 */
 	public static boolean useUnicodeMetadata() { return showUnicode; }
 
+	/**
+	 * Returns whether or not to play the theme song.
+	 * @return true if enabled
+	 */
+	public static boolean isThemSongEnabled() { return themeSongEnabled; }
+
 	/**
 	 * Sets the track checkpoint time, if within bounds.
 	 * @param time the track position (in ms)
@@ -1410,6 +1437,9 @@ public class Options extends BasicGameState {
 				case "Checkpoint":
 					setCheckpoint(Integer.parseInt(value));
 					break;
+				case "MenuMusic":
+					themeSongEnabled = Boolean.parseBoolean(value);
+					break;
 				}
 			}
 		} catch (IOException e) {
@@ -1501,6 +1531,8 @@ public class Options extends BasicGameState {
 			writer.newLine();
 			writer.write(String.format("Checkpoint = %d", checkpoint));
 			writer.newLine();
+			writer.write(String.format("MenuMusic = %b", themeSongEnabled));
+			writer.newLine();
 			writer.close();
 		} catch (IOException e) {
 			Log.error(String.format("Failed to write to file '%s'.", OPTIONS_FILE.getAbsolutePath()), e);

src/itdelatrisu/opsu/states/SongMenu.java

@@ -501,6 +501,10 @@ public class SongMenu extends BasicGameState {
 	public void enter(GameContainer container, StateBasedGame game)
 			throws SlickException {
 		Display.setTitle(game.getTitle());
+
+		// stop playing the theme song
+		if (MusicController.isThemePlaying() && focusNode != null)
+			MusicController.play(focusNode.osuFiles.get(focusNode.osuFileIndex), true);
 	}
 
 	@Override

src/itdelatrisu/opsu/states/Splash.java

@@ -18,6 +18,7 @@
 
 package itdelatrisu.opsu.states;
 
+import itdelatrisu.opsu.MusicController;
 import itdelatrisu.opsu.Opsu;
 import itdelatrisu.opsu.OsuParser;
 import itdelatrisu.opsu.OszUnpacker;
@@ -140,6 +141,10 @@ public class Splash extends BasicGameState {
 			Opsu.groups.init();
 			((SongMenu) game.getState(Opsu.STATE_SONGMENU)).setFocus(Opsu.groups.getRandomNode(), -1, true);
 
+			// play the theme song
+			if (Options.isThemSongEnabled())
+				MusicController.playThemeSong();
+
 			game.enterState(Opsu.STATE_MAINMENU);
 		}
 	}