AVAudioPlayer doesn't start playing in background

Question

I am using AVAudioPlayer and NSFileHandle to do audio streaming. The basic idea is that I save the streaming audio data to the device with file sys

Answer 1

Your app cannot start playing audio in the background. And this makes sense. Think what the device would be like if an app that the user is not actively using could suddenly start producing sound! Remember, to the user, sending an app to the background is the naive equivalent of quitting that app. Your app must not rise like a zombie from the dead and start making noise!

The background audio setting allows your app that was producing audio while in the foreground to continue to do so when it then goes into the the background. It then can continue being in charge of the audio (if it receives remote events) until some other app produces sound; after that, your app is once again out of the running until it is brought to the foreground and produces sound.

So you'll need to start playing some sound before your app goes into the background, if you want this to work.

Answer 2

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

UIBackgroundTaskIdentifier newTaskId = UIBackgroundTaskInvalid;
newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];

/* And in info.Plist file Required background modes : App PLAYS Audio */

Answer 3

Faced this very problem. Let me suggest you to use AVAudioSessionCategoryOptionMixWithOthers with -setCategory:withOptions:error:. Also, probably it makes sense to activate the session after you set the category, not before.

Answer 4

Please use this code in - (void)applicationDidEnterBackground:(UIApplication *)application

UIApplication *app = [UIApplication sharedApplication];
UIBackgroundTaskIdentifier bgTask = 0;

bgTask = [app beginBackgroundTaskWithExpirationHandler:^{ 
[app endBackgroundTask:bgTask]; 
}];
AudioSessionSetActive(false);

and use this code in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

AudioSessionInitialize (NULL,NULL,NULL,NULL);
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty (kAudioSessionProperty_AudioCategory,sizeof (sessionCategory),&sessionCategory);
AudioSessionSetActive(true);

hope this helps.