SimpleAudioEngine shuffle playlist

Question

i want to shuffle a dozen of songs in my game. Next song should not be the same as current song.

[[[SimpleAudioEngine sharedEngine] playBackgroundMusic: song];

There should be a loop and song should be randomized,

[[NSString stringWithFormat: @"song%i.mp3", arc4random() % 20 + 1];
//20 songs starting from song1.mp3

It would be great if the song will stop playing when the user's ipod music is playing. But the sound effect should still be available:

[[SimpleAudioEngine sharedEngine] playEffect: @"aaa.caf"]

Also, when the ipod music is playing, then launch the game, game music should not even be started.

How to implement this?

the playlist is from my game, not users' ipod playlist. – OMGPOP Aug 14 '11 at 05:15 — OMGPOP, Aug 14 '11 at 05:15

Nicolas S · Accepted Answer · 2011-08-14T06:55:54.257

0

When you start your app, you can check like this and play or not your own music.

if ([[MPMusicPlayerController iPodMusicPlayer] playbackState] == MPMusicPlaybackStatePlaying) {
    // dont play and do whatever you think should be done in this case
} else {
    [[[SimpleAudioEngine sharedEngine] playBackgroundMusic: song];
}

Side note:

//Remember to preload your effects and bg music so there is not any delay
[[SimpleAudioEngine sharedEngine] preloadEffect:@"aaa.caf"];
[[SimpleAudioEngine sharedEngine] preloadBackgroundMusic:@"song1.mp3"];
//And to unload your effects when you wont use them anymore or receive a mem warning, or in dealloc
[[SimpleAudioEngine sharedEngine] unloadEffect:@"aaa.caf"];

UPDATE

In viewDidLoad, create an strings array with all your songs and shuffle them with: [self shuffle],for this implement this code:

- (void)shuffle {
    for (NSInteger i = [songsArray count] - 1; i > 0; --i) [songsArray exchangeObjectAtIndex:(arc4random() % (i+1)) withObjectAtIndex:i];
}

Every time your background music finishes use [self shuffle] and then playBackgroundMusic:[songsArray lastObject] that should take care of your shuffled playlist.

edited Aug 14 '11 at 06:55

answered Aug 14 '11 at 06:14

Nicolas S

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what i need is to shuffle a playlist. randomly choose a new song to play after finishing current song. your code will play only one song – OMGPOP Aug 14 '11 at 06:42
how can i trigger -(void) shuffle when one song is done playing. – OMGPOP Aug 14 '11 at 07:09
Im not familiar with _SimpleAudioEngine_ you could check if there is any kind of notification you could use. – Nicolas S Aug 14 '11 at 07:11
There is a method called didFinishedPlaying for NSSound, but as i said, i dont know about _SimpleAudioEngine_ – Nicolas S Aug 14 '11 at 07:35
I just add a if-else in the shuffle, if music is not playing, then pick one song to play. then schedule your shuffle method. it works well now. – OMGPOP Sep 05 '11 at 00:03

SimpleAudioEngine shuffle playlist

1 Answers1