Re: Openal Digest, Vol 62, Issue 3

OK we'll read em down at rehearsal. Still no answer on July 4th.

SOUNDMINDZ
Music & Sound Design
www.GregRahn.net
Greg Rahn
707-246-4922
Linked In: http://www.linkedin.com/in/GregRahnMusic

On May 5, 2011, at 12:00 PM, [email protected]  
wrote:

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> Today's Topics:
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>   1. RE: RE: iPhone limit audio playback to speakers (Chris Perry)
>   2. Re: RE: iPhone limit audio playback to speakers (Edward Rudd)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 4 May 2011 15:13:00 -0700
> From: Chris Perry <[email protected]>
> Subject: RE: [Openal] RE: iPhone limit audio playback to speakers
> Cc: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> 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
>
>> 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
>>>> -- 
>>>> Beginning iPhone Games Development
>>>> http://playcontrol.net/iphonegamebook/
>>>> _______________________________________________
>>>> Openal mailing list
>>>> [email protected]
>>>> http://opensource.creative.com/mailman/listinfo/openal
>>> _______________________________________________
>>> Openal mailing list
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> ------------------------------
>
> Message: 2
> Date: Wed, 4 May 2011 19:30:46 -0400
> From: Edward Rudd <[email protected]>
> Subject: Re: [Openal] RE: iPhone limit audio playback to speakers
> To: Chris Perry <[email protected]>
> Cc: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>
> 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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> End of Openal Digest, Vol 62, Issue 3
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