Adding sound to your game with Cocos2D

If you are developing a game probably you need to add sound to your app.

As many other things, although Apple offers you a library to manage the audio, Cocos2D has it's own class: SimpleAudioEngine. It makes you really easy to insert background music and sound effects. It also allows you to modify basic properties such as pitch, pan and gain, and the possibility of looping a sound.

You can preload the sound (if you have a lot and heavy sounds). For loopings you need a CDSoundsource class:

	soundEngine = [SimpleAudioEngine sharedEngine];
	[soundEngine preloadEffect:@"sound1.mp3"];
	[soundEngine preloadEffect:@"sound2.mp3"];
	[soundEngine preloadBackgroundMusic:@"backgroundMusic.mp3"];
	loopingSound = [[soundEngine soundSourceForFile:@"loopingSound.mp3"] retain];
	loopingSound.looping = YES;

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Playing effects and background is very easy:

	[soundEngine playBackgroundMusic:@"backgroundMusic.mp3" loop:YES];
	[soundEngine playEffect:@"sound1.mp3"];

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Setting other properties is also easy:

	[soundEngine setBackgroundMusicVolume:0.4];
	[soundEngine playEffect:@"sound1.mp3" pitch:1 pan:0 gain:0.4];
	[loopingSound setMute:YES];

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Playing around with looping sounds:

	[loopingSound play];
	[loopingSound pause];
	[loopingSound rewind];
	[loopingSound stop];

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	// Never forget to release the looping sound in the dealloc method
	[loopingSound release];

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