Re: RE: iPhone limit audio playback to speakers

On May 4, 2011, at 18:13 , Chris Perry wrote:

> Posting this solution for completeness sake.
> 
> Interesting enough, it can be done!
> 
> Basically you add a property listener to get route change events:
>     AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback,0);
> 
> Then in the callback, determine if its a headphone being plugged-in and override the audio route:
>         UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
>         AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);
> 
> Too simple...


Chris, thanks for sharing this..  Very good to know.


> 
> > CC: [email protected]; [email protected]
> > From: [email protected]
> > Subject: Re: [Openal] RE: iPhone limit audio playback to speakers
> > Date: Fri, 29 Apr 2011 13:24:30 -0700
> > To: [email protected]
> > 
> > Results are in... Apparently this functionality is currently not supported. 
> > =]
> > 
> > Sent from my iPad
> > 
> > On Apr 29, 2011, at 1:06 AM, Chris Perry <[email protected]> wrote:
> > 
> > > Thanks Eric, I think you are right. 
> > > 
> > > The AVAudioPlayer behaves as expected and Apple's implementation of OpenAl correctly responds to other properties of the session, just not the one I'm currently interested in =]
> > > 
> > > I've submitted a tech support item with Apple regarding this issue and will respond here when they get back to me!
> > > 
> > > Thanks,
> > > Chris
> > > 
> > > > Date: Thu, 28 Apr 2011 11:06:13 -0700
> > > > Subject: Re: [Openal] RE: iPhone limit audio playback to speakers
> > > > From: [email protected]
> > > > To: [email protected]
> > > > CC: [email protected]
> > > > 
> > > > AudioSessions are an iOS specific item and are probably a bit outside
> > > > the scope and expertise of this list. However, I'll give it a try.
> > > > 
> > > > I've never tried overriding the output behavior on an iOS device. Does
> > > > your technique work if you use, say AVAudioPlayer instead of OpenAL?
> > > > If so, I would say you have indeed found a bug with Apple's iOS OpenAL
> > > > implementation and you should file a bug with Apple to get this fixed.
> > > > 
> > > > The caveat is that Apple's HI guidelines discourage you from trying to
> > > > override the output device. Particularly on iOS, the user is supposed
> > > > to be in control of these things and not automatically rerouting to
> > > > headphones is a potentially user confusing behavior.
> > > > 
> > > > -Eric

Edward Rudd
OutOfOrder.cc
317-674-3296

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