I want to play sequence of sounds with AVAudioPlayer. All are ok in foreground, but in background I have issues.
After scheduling next sound it plays in background, but initialisation of sound after next fails.
How to resolve this issue?
In fact, I have sequence of sounds and sequence of starting moments. When user touch button application starts play sounds.
I use the following code:
- (void)soundScheduleNext
{
NSURL * url = ...; // get url of next sound file
if (soundPlayer == nil)
soundPlayer = [AVAudioPlayer alloc];
soundPlayer = [soundPlayer initWithContentsOfURL:url error:nil];
soundPlayer.delegate = self;
AVAudioSession * audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
// if this is a first element of sound sequence...
if (soundSeqNext == 0)
{
// ... play right now
[soundPlayer prepareToPlay];
soundStartMoment = [soundPlayer deviceCurrentTime];
[soundPlayer play];
} else {
BOOL prepareToPlayOk = [soundPlayer prepareToPlay];
// when second element of sequence play - prepareToPlayOk is YES; when third - prepareToPlayOk is NO :(
NSLog(@"soundScheduleNext: prepareToPlayOk = %d", (int)prepareToPlayOk, nil);
NSTimeInterval timeMoment = ... ; // get moment of time for next sound
[soundPlayer playAtTime:timeMoment];
}
soundSeqNext++;
}
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
[self soundScheduleNext];
}
audioPlayerDidFinishPlaying function is called every time after end of sound playback finished.
