diff -r f31b5213b163 -r a187c280dd3d project_files/HedgewarsMobile/Classes/AudioManagerController.m
--- a/project_files/HedgewarsMobile/Classes/AudioManagerController.m	Mon Apr 09 02:02:14 2012 +0200
+++ b/project_files/HedgewarsMobile/Classes/AudioManagerController.m	Mon Apr 09 03:25:17 2012 +0200
@@ -19,137 +19,157 @@
 
 #import "AudioManagerController.h"
 #import "AVFoundation/AVAudioPlayer.h"
-#import <AudioToolbox/AudioToolbox.h>
 #import "MXAudioPlayerFadeOperation.h"
 
 
-static AVAudioPlayer *backgroundMusic = nil;
-static SystemSoundID clickSound = -1;
-static SystemSoundID backSound = -1;
-static SystemSoundID selSound = -1;
+#define DEFAULT_VOLUME    0.45f
+#define FADEOUT_DURATION  3.0f
+#define FADEIN_DURATION   2.0f
 
-static NSOperationQueue *audioFaderQueue = nil;
-static MXAudioPlayerFadeOperation *fadeIn = nil;
-static MXAudioPlayerFadeOperation *fadeOut = nil;
+static AudioManagerController *mainInstance;
 
 @implementation AudioManagerController
+@synthesize backgroundMusic, clickSound, backSound, selSound, audioFaderQueue;
+
++(id) mainManager {
+    if (mainInstance == nil)
+        mainInstance = [[self alloc] init];
+    return mainInstance;
+}
+
+-(id) init {
+    if (self = [super init]) {
+        self.backgroundMusic = nil;
+        self.clickSound = -1;
+        self.backSound = -1;
+        self.selSound = -1;
+
+        self.audioFaderQueue = nil;
+    }
+    return self;
+}
+
+-(void) dealloc {
+    [self unloadSounds];
+    releaseAndNil(backgroundMusic);
+    releaseAndNil(audioFaderQueue);
+    mainInstance = nil;
+    [super dealloc];
+}
+
+-(void) didReceiveMemoryWarning {
+    if (self.backgroundMusic.playing == NO)
+        self.backgroundMusic = nil;
+    if ([self.audioFaderQueue operationCount] == 0)
+        self.audioFaderQueue = nil;
+
+    [self unloadSounds];
+    MSG_MEMCLEAN();
+}
 
 #pragma mark -
 #pragma mark background music control
-+(void) loadBackgroundMusic {
-    NSString *musicString = [[NSBundle mainBundle] pathForResource:@"hwclassic" ofType:@"mp3"];
-    backgroundMusic = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:musicString] error:nil];
-
-    backgroundMusic.delegate = nil;
-    backgroundMusic.volume = 0;
-    backgroundMusic.numberOfLoops = -1;
-    [backgroundMusic prepareToPlay];
-}
-
-+(void) playBackgroundMusic {
+-(void) playBackgroundMusic {
     if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"music"] boolValue] == NO)
         return;
 
-    if (backgroundMusic == nil)
-        [AudioManagerController loadBackgroundMusic];
-
-    backgroundMusic.volume = 0.45f;
-    [backgroundMusic play];
+    if (self.backgroundMusic == nil) {
+        NSString *musicString = [[NSBundle mainBundle] pathForResource:@"hwclassic" ofType:@"mp3"];
+        self.backgroundMusic = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:musicString] error:nil];
+        self.backgroundMusic.delegate = nil;
+        self.backgroundMusic.numberOfLoops = -1;
+    }
+    
+    self.backgroundMusic.volume = DEFAULT_VOLUME;
+    [self.backgroundMusic play];
 }
 
-+(void) pauseBackgroundMusic {
-    [backgroundMusic pause];
+-(void) pauseBackgroundMusic {
+    [self.backgroundMusic pause];
 }
 
-+(void) stopBackgroundMusic {
-    [backgroundMusic stop];
+-(void) stopBackgroundMusic {
+    [self.backgroundMusic stop];
 }
 
-+(void) fadeOutBackgroundMusic {
+-(void) fadeOutBackgroundMusic {
     if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"music"] boolValue] == NO)
         return;
 
-    if (audioFaderQueue == nil)
-        audioFaderQueue = [[NSOperationQueue alloc] init];
-    if (backgroundMusic == nil)
-        [AudioManagerController loadBackgroundMusic];
-    if (fadeOut == nil)
-        fadeOut = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:backgroundMusic toVolume:0.0 overDuration:3.0];
-
-    [audioFaderQueue addOperation:fadeOut];
+    if (self.audioFaderQueue == nil)
+        self.audioFaderQueue = [[NSOperationQueue alloc] init];
+    
+    MXAudioPlayerFadeOperation *fadeOut = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:self.backgroundMusic
+                                                                                             toVolume:0.0
+                                                                                         overDuration:FADEOUT_DURATION];
+    [self.audioFaderQueue addOperation:fadeOut];
+    [fadeOut release];
 }
 
-+(void) fadeInBackgroundMusic {
+-(void) fadeInBackgroundMusic {
     if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"music"] boolValue] == NO)
         return;
 
-    if (audioFaderQueue == nil)
-        audioFaderQueue = [[NSOperationQueue alloc] init];
-    if (backgroundMusic == nil)
-        [AudioManagerController loadBackgroundMusic];
-    if (fadeIn == nil)
-        fadeIn = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:backgroundMusic toVolume:0.45 overDuration:2.0];
+    if (self.audioFaderQueue == nil)
+        self.audioFaderQueue = [[NSOperationQueue alloc] init];
 
+    [self playBackgroundMusic];
+    MXAudioPlayerFadeOperation *fadeIn = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:self.backgroundMusic
+                                                                                            toVolume:DEFAULT_VOLUME
+                                                                                        overDuration:FADEIN_DURATION];
     [audioFaderQueue addOperation:fadeIn];
+    [fadeIn release];
 }
 
 #pragma mark -
 #pragma mark sound effects control
-+(SystemSoundID) loadSound:(NSString *)snd {
-    // get the filename of the sound file:
-    NSString *path = [NSString stringWithFormat:@"%@/%@",[[NSBundle mainBundle] resourcePath],snd];
+-(SystemSoundID) loadSound:(NSString *)snd {
+    SystemSoundID soundID;
 
-    // declare a system sound id and get a URL for the sound file
-    SystemSoundID soundID;
+    // get the filename of the sound file in a NSURL format
+    NSString *path = [[NSString alloc] initWithFormat:@"%@/%@",[[NSBundle mainBundle] resourcePath],snd];
     NSURL *filePath = [NSURL fileURLWithPath:path isDirectory:NO];
+    [path release];
 
     // use audio sevices to create and play the sound
     AudioServicesCreateSystemSoundID((CFURLRef)filePath, &soundID);
     return soundID;
 }
 
-+(void) playClickSound {
-    if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"sound"] boolValue] == NO)
-        return;
-    
-    if (clickSound == -1)
-        clickSound = [AudioManagerController loadSound:@"clickSound.wav"];
-    
-    AudioServicesPlaySystemSound(clickSound);
+-(void) unloadSounds {
+    AudioServicesDisposeSystemSoundID(clickSound), clickSound = -1;
+    AudioServicesDisposeSystemSoundID(backSound), backSound = -1;
+    AudioServicesDisposeSystemSoundID(selSound), selSound = -1;
 }
 
-+(void) playBackSound {
+-(void) playClickSound {
     if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"sound"] boolValue] == NO)
         return;
     
-    if (backSound == -1)
-        backSound = [AudioManagerController loadSound:@"backSound.wav"];
+    if (self.clickSound == -1)
+        self.clickSound = [self loadSound:@"clickSound.wav"];
     
-    AudioServicesPlaySystemSound(backSound);
+    AudioServicesPlaySystemSound(self.clickSound);
 }
 
-+(void) playSelectSound {
+-(void) playBackSound {
     if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"sound"] boolValue] == NO)
         return;
     
-    if (selSound == -1)
-        selSound = [AudioManagerController loadSound:@"selSound.wav"];
+    if (self.backSound == -1)
+        self.backSound = [self loadSound:@"backSound.wav"];
     
-    AudioServicesPlaySystemSound(selSound);
+    AudioServicesPlaySystemSound(self.backSound);
 }
 
-#pragma mark -
-#pragma mark memory management
-+(void) releaseCache {
-    [backgroundMusic stop];
-    [backgroundMusic release], backgroundMusic = nil;
-    [fadeOut release], fadeOut = nil;
-    [fadeIn release], fadeIn = nil;
-    [audioFaderQueue release], audioFaderQueue = nil;
-    AudioServicesDisposeSystemSoundID(clickSound), clickSound = -1;
-    AudioServicesDisposeSystemSoundID(backSound), backSound = -1;
-    AudioServicesDisposeSystemSoundID(selSound), selSound = -1;
-    MSG_MEMCLEAN();
+-(void) playSelectSound {
+    if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"sound"] boolValue] == NO)
+        return;
+    
+    if (self.selSound == -1)
+        self.selSound = [self loadSound:@"selSound.wav"];
+    
+    AudioServicesPlaySystemSound(self.selSound);
 }
 
 @end