How to make delays between AVPlayerItems in AVQueuePlayer in background task? - ios

Question

I trying to make delays between AVPlayerItems, but I don't understand how to make this. I need to play sounds in background (when iOS app in background) with delays between these sounds. But AVQueuePlayer doesn't support this feature. When i trying to pause the sound after it finished, the next sound don't want to play. However, in foreground that algorithm works fine.
This is code, which i running in background task:
AVQueuePlayer *player = [[AVQueuePlayer alloc] initWithItems: items];
[player play];
NSUInteger currentIndex = 0;
AVPlayerItem *lastItem = nil;
while(currentIndex < items.count && self.enabled) {
AVPlayerItem *currentItem = [player currentItem];
while(currentItem == lastItem || currentItem == nil) {
[NSThread sleepForTimeInterval:0.2f];
currentItem = [player currentItem];
}
while(currentItem.status != AVPlayerItemStatusReadyToPlay) {
[NSThread sleepForTimeInterval:0.2f];
NSLog(#"Loading...");
}
lastItem = currentItem;
CGFloat time = 0.0f;
CGFloat duration = 0.0f;
while(duration < 0.5f) {
[NSThread sleepForTimeInterval: 0.5f];
if(currentItem.duration.timescale > 0)
duration = (double) currentItem.duration.value / (double) currentItem.duration.timescale;
}
while(time < duration - 0.1f) {
[NSThread sleepForTimeInterval: 0.08f];
time = (double) currentItem.currentTime.value / (double) currentItem.currentTime.timescale;
}
[player pause];
CGFloat delay = someDelayBetweenSounds;
[NSThread sleepForTimeInterval: delay];
[player play];
currentIndex++;
}
My English is very bad, therefore I apologize

Answer 1

When an item finishes, you can pause the player and start it up again after a given delay. It's much better to do it this way than blocking an entire thread.
- (void) AVPlayerItemDidPlayToEndTimeNotification: (NSNotification *)notification {
self.avQueuePlayer.rate = 0;
CGFloat delay = 500;
dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, (delay) * NSEC_PER_MSEC);
dispatch_after(delay, dispatch_get_main_queue() , ^{
self.avQueuePlayer.rate = 1;
});