Playing sounds in sequence with SimpleAudioEngine - ios

Question

I'm building an iOS app with cocos2d 2, and I'm using SimpleAudioEngine to play some effects.
Is there a way to sequence multiple sounds to be played after the previous sound is complete?
For example in my code:
[[SimpleAudioEngine sharedEngine] playEffect:#"yay.wav"];
[[SimpleAudioEngine sharedEngine] playEffect:#"youDidIt.wav"];
When this code is run, yay.wav and youDidIt.wav play at the exact same time, over each other.
I want yay.wav to play and once complete, youDidIt.wav to play.
If not with SimpleAudioEngine, is there a way with AudioToolbox, or something else?
Thank you!
== UPDATE ==
I think I'm going to go with this method using AVFoundation:
AVPlayerItem *sound1 = [[AVPlayerItem alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"yay" ofType:#"wav"]]];
AVPlayerItem *sound2 = [[AVPlayerItem alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"YouDidIt" ofType:#"wav"]]];
AVQueuePlayer *player = [[AVQueuePlayer alloc] initWithItems: [NSArray arrayWithObjects:sound1, sound2, nil]];
[player play];

Answer 1

The easy way would be getting the track duration using -[CDSoundSource durationInSeconds] and then schedule the second effect playing after a proper delay:
[[SimpleAudioEngine sharedEngine] performSelector:#selector(playEffect:) withObject:#"youDidIt.wav" afterDelay:duration];
An easier way to get the audio duration would be patching SimpleAudioManager and add a method that queries its CDSoundEngine (a static global) for the audio duration:
- (float)soundDuration {
return [_engine bufferDurationInSeconds:_soundId];
}
The second approach would be polling on the status of the audio engine and wait for it to stop playing.
alGetSourcei(sourceId, AL_SOURCE_STATE, &state);
if (state == AL_PLAYING) {
...
The sourceId is the ALuint returned by playEffect.

Answer 2

It's simple, tested with Cocos2D 2.1:
Creates a property durationInSeconds on SimpleAudioEngine.h :
#property (readonly) float durationInSeconds;
Synthesize them :
#synthesize durationInSeconds;
Modify playEffect like this :
-(ALuint) playEffect:(NSString*) filePath pitch:(Float32) pitch pan:(Float32) pan gain:(Float32) gain {
int soundId = [bufferManager bufferForFile:filePath create:YES];
if (soundId != kCDNoBuffer) {
durationInSeconds = [soundEngine bufferDurationInSeconds:soundId];
return [soundEngine playSound:soundId sourceGroupId:0 pitch:pitch pan:pan gain:gain loop:false];
} else {
return CD_MUTE;
}
}
As you can see, I inserted durationInSeconds value directly from soundEngine bufferDurationInSeconds from the result of bufferManager.
Now, only ask for the value [SimpleAudioEngine sharedEngine].durationInSeconds and you've got the float duration in seconds of this sound.
Put a timer this seconds and after this, play the next iteration of your sound or put the flag OFF or something.