SFXEngine.h

//
//  SFXEngine.h
//  Sound Effects Test
//
//  Created by Zachry Thayer on 10/16/11.
//  Copyright (c) 2011 Zachry Thayer. All rights reserved.
//

/*
 
 // sound.c
 enum Sfx {
 SFX_MENUNEXT,SFX_MENUSELECT,SFX_PAIN,SFX_JUMP,SFX_PISTOL,SFX_SHOTGUN,SFX_MACHINEGUN,
 SFX_ZOMBIEDEAD1,SFX_ZOMBIEDEAD2,SFX_WIN,SFX_LOSE,SFX_NEWLIFE,MAXSFX
 };
 
 enum Song {
 SONG_THEME,SONG_MENU
 };
 void initSound();
 void loadSounds();
 void playSound(int id);
 void playSong(int id);
 void songVolume(int vol);
 
 */

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>

enum SFX {
    SFX_MENUNEXT,
    SFX_MENUSELECT,
    SFX_PAIN,
    SFX_JUMP,
    SFX_PISTOL,
    SFX_SHOTGUN,
    SFX_MACHINEGUN,
    SFX_ZOMBIEDEAD1,
    SFX_ZOMBIEDEAD2,
    SFX_WIN,
    SFX_LOSE,
    SFX_NEWLIFE,
    SFX_COUNT
};


enum SONG {
    SONG_THEME,
    SONG_MENU,
    SONG_COUNT
};


@interface SFXEngine : NSObject{
    NSInteger volume;
}

@property (nonatomic, retain) NSMutableArray *preloadedSFX;

@property (nonatomic, retain) AVAudioPlayer *songPlayer;

@property (nonatomic) NSInteger volume;

- (void)playSound:(NSInteger)sound;
- (void)playSong:(NSInteger)song;


@end

SFXEngine.m

//
//  SFXEngine.m
//  Sound Effects Test
//
//  Created by Zachry Thayer on 10/16/11.
//  Copyright (c) 2011 Zachry Thayer. All rights reserved.
//

#import "SFXEngine.h"


const char *SFX_FILENAMES[] = {
    "menunext",
    "menuselect",
    "pain",
    "jump",
    "pistol",
    "shotgun",
    "machinegun",
    "zombie1",
    "zombie2",
    "win",
    "lose",
    "newlife"
};

const char *SONG_FILENAMES[] = {
    "theme",
    "menu",
    
};

@interface SFXEngine ()
{
    @private
    
    NSMutableArray *preloadedSFX;
    
    AVAudioPlayer *songPlayer;
    
}

- (BOOL)isValidSound:(NSInteger)sound;
- (BOOL)isValidSong:(NSInteger)song;


@end

@implementation SFXEngine


@synthesize preloadedSFX;
@synthesize songPlayer;
@synthesize volume;


- (id)init{
    
    self = [super init];
    if (self) {
        
        preloadedSFX = [[NSMutableArray array] retain];
        
        for (NSInteger i = 0; i < SFX_COUNT; i++) {
            
            NSString *filename = [NSString stringWithCString:SFX_FILENAMES[i] encoding:NSUTF8StringEncoding];
            NSString *sfxPath = [[NSBundle mainBundle] pathForResource:filename ofType:@"aiff"];
            
            if (!sfxPath)
                continue;
            
            NSURL *sfxURL = [NSURL fileURLWithPath:sfxPath];
                  
            
            NSError *error = nil;
            
            AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:sfxURL error:&error];
            
            if (error) {
                NSLog(@"Error@[%@]:%@", sfxURL,[error localizedDescription]);
            }
            
            if (!player) {
                NSLog(@"Failed to init sound, %@", filename);
                
                [preloadedSFX addObject:[NSNull null]];//blank index
            }else{
                
                if (![player prepareToPlay]) {
                    NSLog(@"Failed to load sound buffer, %@", filename);
                }
                
                [preloadedSFX addObject:player];
            }
        }
        
        
    }
    
    return self;
}


- (void)dealloc{
    
    [preloadedSFX release];
    [songPlayer release];
    
    [super dealloc];
}

#pragma mark - Public Methods

- (void)playSound:(NSInteger)sound{
    
    if([self isValidSound:sound]){
    
        AVAudioPlayer *player = [preloadedSFX objectAtIndex:sound];
        
        if ([player isMemberOfClass:[NSNull class]]) {//Check for valid class
            NSLog(@"Tried to play null sound, %s", SFX_FILENAMES[sound]);
        }else{
            
            player.currentTime = 0;//rewind
            [player play];
            
        }
        
    }
    
}

- (void)playSong:(NSInteger)song{
    
    if ([self isValidSong:song]) {
        
        if (songPlayer)
            [songPlayer release];
    
        NSString *filename = [NSString stringWithCString:SONG_FILENAMES[song] encoding:NSUTF8StringEncoding];
        NSString *sfxPath = [[NSBundle mainBundle] pathForResource:filename ofType:@"aiff"];
        
        if (!sfxPath)
            return;
        
        NSURL *sfxURL = [NSURL fileURLWithPath:sfxPath];
        
        songPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:sfxURL error:nil];
        
        if (!songPlayer) {
            NSLog(@"Failed to init song, %@", filename);
            
        }else{
            
            if (![songPlayer prepareToPlay]) {
                NSLog(@"Failed to load song buffer, %@", filename);
            }
            
        }
        
        songPlayer.numberOfLoops = -1;//loop forever
        songPlayer.currentTime = 0;
        [songPlayer play];
        
    }
    
}
    
#pragma marl - Private Helpers
    
- (BOOL)isValidSound:(NSInteger)sound{
    
    if (sound > -1 && sound < SFX_COUNT) {
        return YES;
    }
    
    return FALSE;
    
}


- (BOOL)isValidSong:(NSInteger)song{
    
    if (song > -1 && song < SONG_COUNT) {
        return YES;
    }
    
    return FALSE;
    
}

@end