Adding a soundtrack to an iPhone game.

[Ubermatik]

I've got a problem with playing sounds in my iPhone app: I can manage to play simple sound effects to coincide with an event (in this instance, when the player or computer scores, or when the ball is hit), but I'm having trouble getting a soundtrack to play.

I'm using a .caf file (under instruction), and have placed it in my Resources folder. I've added the code:

SystemSoundID volleyFileID;
	SystemSoundID gameStartFileID;
	SystemSoundID soundTrackFileID;

in theViewController.h file, as well as:

@property(nonatomic) SystemSoundID volleyFileID;
@property(nonatomic) SystemSoundID gameStartFileID;
@property(nonatomic) SystemSoundID soundTrackFileID;

and placed the code:

#import <AudioToolbox/AudioServices.h>

@interface laserhockeyViewController : UIViewController {
	IBOutlet UIImageView *puc;
	IBOutlet UIImageView *paddleblue;
	IBOutlet UIImageView *paddlegreen;
	IBOutlet UILabel *tapToBegin;
	
	IBOutlet UILabel *playerscore;
	IBOutlet UILabel *computerscore;
	
	CGPoint pucVelocity;
	
	NSInteger gameState;
	
	NSInteger playerscorevalue;
	NSInteger computerscorevalue;
	
	SystemSoundID volleyFileID;
	SystemSoundID gameStartFileID;
	SystemSoundID soundTrackFileID;

in the ViewController.m file. Everything seems to be in place, including the following code which I have placed underneath the viewDidLoad method:

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
	self.gameState = kGameStatePaused;
	pucVelocity = CGPointMake(kPucSpeedX,KPucSpeedY);
	[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(gameLoop) userInfo:nil repeats:YES];
	
	NSString *volleyPath = [[NSBundle mainBundle] pathForResource:@"puchit" ofType:@"caf"];
	CFURLRef volleyURL = (CFURLRef ) [NSURL fileURLWithPath:volleyPath];
	AudioServicesCreateSystemSoundID(volleyURL, &volleyFileID);
	
	NSString *gamestartPath = [[NSBundle mainBundle] pathForResource:@"gamestart" ofType:@"caf"];
	CFURLRef gamestartURL = (CFURLRef ) [NSURL fileURLWithPath:gamestartPath];
	AudioServicesCreateSystemSoundID(gamestartURL, &gameStartFileID);
	
	NSString *soundTrackPath = [[NSBundle mainBundle] pathForResource:@"Monolake - Cern" ofType:@"caf"];
	CFURLRef soundTrackURL = (CFURLRef ) [NSURL fileURLWithPath:soundTrackPath];
	AudioServicesCreateSystemSoundID(soundTrackURL, &soundTrackFileID);

}

Can anyone see what's wrong? The code compiles fine, and the build is successful, yet the sound doesn't play in the game, no matter where I place the "AudioServicesPlaySystemSound(soundTrackID);" line of code.

Thanks in advance!

[Ubermatik]

I should have added that I want the music to play as soon as the game loads.

[Ubermatik]

*Bump

Could anyone help me? I'm sure it's only simple, but I just can't get it...

Thanks.

[KennyChong]

Originally Posted by Ubermatik

*Bump

Could anyone help me? I'm sure it's only simple, but I just can't get it...

Thanks.

Try this:
add AVFoundation.framework


#import "AudioToolbox/AudioToolbox.h"



if (!backgroundMusic.playing) {
NSString *backgroundMusicPath = [[NSBundle mainBundle] pathForResource: @"music_back1" ofType: @"m4a"];
NSURL *backgroundMusicURL = [[NSURL alloc] initFileURLWithPath:backgroundMusicPath];
backgroundMusic = [[AVAudioPlayer alloc] initWithContentsOfURL:backgroundMusicURL error:nil];
[backgroundMusic play];
backgroundMusic.numberOfLoops = -1;
backgroundMusic.volume = 0.1;
}

[JasonR]

AudioServicesPlaySystemSound is only designed to play sounds of 30 seconds or less, which is probably the problem. KennyChong's solution can play songs of any length and format.

[Ubermatik]

I'm getting the error "Request for member ' ' in something not a structure or union" - have I placed the code in the wrong part? I placed it in the -(void)viewDidLoad method...

I am also getting "AVAudioPlayer undeclared"

Any ideas? Thanks.

[KennyChong]

Originally Posted by Ubermatik

I'm getting the error "Request for member ' ' in something not a structure or union" - have I placed the code in the wrong part? I placed it in the -(void)viewDidLoad method...

I am also getting "AVAudioPlayer undeclared"

Any ideas? Thanks.

Did you add the Audio framework first?

[Ubermatik]

Yep... it all seems to be there... I'll check over once more though and get back to you...

[Ubermatik]

Do I need to have another .h file, and reference it in my .m file? Because I can't see whats wrong...

[JasonR]

I added this line myself:

#import <AVFoundation/AVFoundation.h>

[Ubermatik]

Yeah, I have that in too... is the problem that in my .h file, I have written it as SystemSound (as you would for AudioServicesSystemSound) instead of something else...?