Re: Error switching kAudioSessionProperty_AudioCategory after iOS 6 update

Subject: Re: Error switching kAudioSessionProperty_AudioCategory after iOS 6 update
From: John Nastos <email@hidden>
Date: Fri, 28 Dec 2012 01:29:21 -0800

Did you ever come up with a more elegant (or future-proof) solution than sniffing the iOS version? I'm running into the same issues in my app with changing the session category.

- John Nastos

On Tue, Oct 9, 2012 at 4:52 PM, Paul Slocum <email@hidden> wrote:

I got my code working in both iOS 5 and 6, but I'm still getting an error in the console in iOS 6 when I switch audio categories, so if anybody can help me with what this error means I'd feel more comfortable knowing :)

19:02:22.757 <CAListenerProxy> shm_open failed: "AppleAURemoteIO.i.2542b" (23) flags=0x2 errno=2
19:02:22.758 <CAListenerProxy> AURemoteIO::ChangeHardwareFormats: error 3

To get things working in iOS 6, I had to uninitialize my remoteIO audio unit before changing the AudioSessionCategory. Oddly, in iOS 5 if I do the same thing then some of my recording code doesn't work, so I'm checking the iOS version number in code and deciding whether to un/re-initialize my audio unit based on the OS version.

Regarding the keyboard click sound, I found that the click sounds are muted when you have the category set to kAudioSessionCategory_PlayAndRecord *and* you initialize a remoteIO unit. It appears that even if the mic input is disabled on the audio unit, the keyboard sound is still muted. I was hoping to find some way to enable the keyboard click sounds without having to change the audio session category, but I need my remoteIO unit running all the time so it doesn't appear possible.

-paul

On Thu, Oct 4, 2012 at 5:34 PM, Paul Slocum <email@hidden> wrote:
-or- is there some way to get the iOS keyboard to make the typewriter sound when in kAudioSessionCategory_PlayAndRecord mode? I'm switching modes because I want the keyboard sounds to work when my app isn't recording.

-paul

On Thu, Oct 4, 2012 at 4:51 PM, Paul Slocum <email@hidden> wrote:
I have a recorder app that needs to switch between kAudioSessionCategory_AmbientSound and kAudioSessionCategory_PlayAndRecord. Before upgrading to iOS 6 this worked great, but since the upgrade I'm getting a couple of errors on the console when I try to enable recording:

code:
UInt32 audioCategory = kAudioSessionCategory_PlayAndRecord;
OSStatus audioCategoryStatus = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(audioCategory), &audioCategory);

console errors:
2012-10-04 11:18:56.388 TestApp[1062:526b] 11:18:56.389 shm_open failed: "AppleAURemoteIO.i.241f5" (23) flags=0x2 errno=2
2012-10-04 11:18:56.390 TestApp[1062:526b] 11:18:56.390 AURemoteIO::ChangeHardwareFormats: error 3

The call to AudioSessionSetProperty does not return any error. Any ideas about what I need to do to fix this?

thanks,
-paul

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- John Nastos
http://johnnastos.com

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