Apple

AVAudioSession *mySession = [AVAudioSession sharedInstance];

[[NSNotificationCenter defaultCenter] addObserver: self

selector: @selector(handleInterruption:)

name: AVAudioSessionInterruptionNotification

object: mySession];

There are other notifications you can listen for as well. Check the docs for these.

-DS

BTW, if by some chance the 3rd party is using this same (new) system, your listener *and* theirs will be called.

On Feb 7, 2014, at 9:01 AM, Beinan Li <email@hidden> wrote:

Hello CoreAudio,

In our iOS app, there are two competing sound engines running (yes very unfortunate).
The first one is from 3rd party and is black box to us. It initializes the audio session before us.

The second one is us.

The first engine probably registered its own audio session interruption listener during session initialization, so that our listener is bypassed.

We cannot negotiate the initialization order with them.

Now my questions is: Is it possible for us to reinitialize the audio session and plug in our interruption listener at that time, or is there a way to plugin in the listener during a session?

I cannot find any doc about this. From my experiments, as soon as the session is done, further initialization will get return code kAudioSessionAlreadyInitialized ('init'). The session listener won't work. There is no "termination" API for the session either.

I also tried playing around AudioSessionSetActive() to no avail.

If my goal can't be achieved, I guess the only way will be to negotiate with the 3rd party to open a gate in their listener to us.

Thanks,
Beinan

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References:
	>Re-initialize audio session on the fly (From: Beinan Li <email@hidden>)
	>Re: Re-initialize audio session on the fly (From: Douglas Scott <email@hidden>)