I am using AVAudioSession and remote IO with the aim of record some info throught both the audio jack connector and the built-in mic... I guess it could be possible with the new feature of iOS 6: Multiroute audio.
In order to do that I would like to get the inputDataSources from my audio session: (https://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVAudioSession_ClassReference/Reference/Reference.html#//apple_ref/c/data/AVAudioSessionCategoryMultiRoute)
What I am doing is:
AVAudioSession *session = [AVAudioSession sharedInstance];
NSArray *available_outputs = [session inputDataSources];
(I am also configuring the audio session and activating it)
What I get is all zeros in available_outputs...
What am I doing wrong?
Found it.
From the documentation:
This currently only applies to certain USB devices.
This API is going to change in iOS 7, but 6 is limited to that obscure definition of "certain USB devices".
BTW, from my tests - it worked on iOS 6.02 for the iPhone microphone but not on 6.1.4 (both tests on iPhone 5).