CODEWITHSUNDEEP
objective-ciosavaudiosession
miho
miho

Reputation: 12085

Why does iOS not inform my application about audio session interruptions?

I am using AVPlayer to play sound from different sources (including iPod music library). Due to the fact that AVPlayer is more low level AVAudioPlayer I have to handle interruptions myself. Using AVAudioPlayer is not an option!

In the Apple developer documents they mention to either listen AVAudioSessionInterruptionNotificationor setup a listener with AudioSessionInitialize. But when doing so I only receive notifications when the interruption ended, but due to their documents my app should be able to handle both.

I am using the following code to initialize my audio session: (simplified version, removed unimportant lines)

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

And here is how the listener looks like:

void ARInterruptionListenerCallback(void *inUserData, UInt32 interruptionState) {
    if (interruptionState == kAudioSessionBeginInterruption) {
        // Here is the code which is never called...
    }
    else if (interruptionState == kAudioSessionEndInterruption) {
        // But this case will be executed!
    }
}

Btw. I am expecting this code executed when there is an interruption like a phone call or similar. Am I misunderstand what Apple declares as interruption?

Upvotes: 2

Views: 4135

Answers (1)

sam_899
sam_899

Reputation: 306

There is a bug in iOS 6. The interrupt code never seems to be called for begin interrupt - That includes both the old deprecated method (using AVAudioSession delegate) and the new notification method.

Myself and a few others have raised a high severity bug request with Apple so I suggest you do the same (bugreport.apple.com) to get their attention.

I'm not sure what you're using the interrupt for, but I was using it to allow audio to resume after the interrupt if necessary, and also update the play/pause button in the interface. I had to change my method to watch the AVPlayer rate property to toggle the play/pause button, and not allow audio to resume after an interruption.

Edit: see this thread

Upvotes: 5

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