SimpleAudioEngine playEffect: with a callback

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SimpleAudioEngine playEffect: with a callback

(6 posts) (4 voices)

Started 1 year ago by nospam4me
Latest reply from Steve Oldmeadow

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nospam4me
Member

Hi,
I'm playing sounds using SimpleAudioEngine playEffect:.
Everythings works fine, except that's I need to know when the sound is finished.
Is there a simple way to be notified when the playing is finished ?
Something like :
SimpleAudioEngine playEffect:(NSString*)file withTarget:(id)target andCallback:(SEL)callback
Thanks.

Posted 1 year ago #
Steve Oldmeadow
Administrator

No, it is not possible.

You need to use a CDSoundSource object and keep polling the isPlaying property until it returns no. Click on the CDSoundSource tag that I just added for more information.

Posted 1 year ago #
nospam4me
Member

OK.
Thanks !

Posted 1 year ago #
pats
Member

What I did as I didn't want to keep polling, and I know how long my sounds were was to set up an action callback when I played the sound with a duration set to the length of the sound file.

[fart play];
id action1 = [CCSequence actions:[CCDelayTime actionWithDuration:1.0], [CCCallFunc actionWithTarget:self selector:@selector(callback1)], nil];

Works fine for me.

pats

Posted 1 year ago #
pr0fess0r
Member
Hi Guys

I'm trying to do a similar thing - I am working on an app that plays relatively short sound effects, triggered by a menu button (I'm using Ray Wenderlich's excellent tutorial at http://www.raywenderlich.com/414/how-to-create-buttons-in-cocos2d-simple-radio-and-toggle).
I'd like the button to toggle back to it's original state once the sound has finished playing.
I'm using SimpleAudioEngine instead of CDSoundSource because I want to preload the effect using preloadEffect to avoid the playback delay when a menu button is tapped the first time.
So, following pats suggestion, I have this:

In my Layer's init()
```
[[SimpleAudioEngine sharedEngine] preloadEffect:@"sound.caf"];
// stuff...
CCMenu *toggleMenu = [CCMenu menuWithItems:toggleItem, nil];
toggleMenu.position = ccp(60, 120);
[self addChild:toggleMenu];
```
When the menu button is toggled (this sound is 2 seconds long):
```
- (void)plusMinusButtonTapped:(id)sender {
    CCMenuItemToggle *toggleItem = (CCMenuItemToggle *)sender;
    [[SimpleAudioEngine sharedEngine] playEffect:@"sound.caf"];
    id action1 = [CCSequence actions:[CCDelayTime actionWithDuration:2.0], [CCCallFunc actionWithTarget:self selector:@selector(mycallbackfunction)], nil];
}
```
and my call back function is:
```
- (void)mycallbackfunction:(id)sender {
    // ToDo
}
```
In the callback function I want to reset the state of the button once the sound has finished playing.
My questions are:
- is there a better way to do this with CDSoundSource and the isPlaying property and still be able to preload the sounds?
- how do I pass the toggleItem to the callback function so I can tell it to reset it's displayed state?

Thanks in advance for any tips :)

Cheers

Lucas
Posted 9 months ago #
Steve Oldmeadow
Administrator

playEffect and CDSoundSource use the same sound pool. Therefore preloadEffect will preload the sound for use by playEffect and CDSoundSource.

As for your other question, I can't help you. I wouldn't do it like that. I'd just use a finite state machine with a single tick method but that is old school (and Birkemose ;) ) style.

Posted 9 months ago #

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