User guide

Listing 3-2 An interruption-ended delegate method for an audio player

- (void) audioPlayerEndInterruption: (AVAudioPlayer *) player {

if (interruptedOnPlayback) {

[player prepareToPlay];

[player play];

playing = YES;

interruptedOnPlayback = NO;

}

Responding to a Media Server Reset

The media server provides audio and other multimedia functionality through a shared server process. Although

rare, it is possible for the media server to reset while your app is active. Register for the

AVAudioSessionMediaServicesWereResetNotification notification to monitor for a media server

reset. After receiving the notification, your app needs to do the following:

●

Dispose of orphaned audio object and create new audio objects

●

Reset any internal audio states being tracked, including all properties of AVAudioSession

●

When appropriate, reactivate the AVAudioSession using the setActive:error: method

Important: Apps do not need to re-register for any AVAudioSession notifications or reset

key-value-observers on AVAudioSession properties.

You can also register for the AVAudioSessionMediaServicesWereLostNotification notification if you

want to know when the media server first becomes unavailable. However, most apps only need to respond to

the reset notification. Only use the lost notification if the app must respond to user events that occur after the

media server is lost, but before the media server is reset.

Providing Guidelines to the User

A user may not want an app to be interrupted by a competing audio session—for instance, when running an

audio recorder to capture a presentation.

Responding to Interruptions

Responding to a Media Server Reset