IPhone SDK - test for sound input availability?

Should one try to determine if the device has a microphone available before calling AudioQueueNewInput and AudioQueueStart? I didn't see any mention of this requirement in the Audio Queue Services Programming Guide. (But in ancient MacOS history, one used to at least check the gestaltSoundAttr for the gestaltPlayAndRecord flags before trying to use the Sound Manager...)
I have some audio queue input code which seems to work on the SDK simulator; what will happen if someone tries to run this code on an iPod Touch, which doesn't have a mic (AFAIK)? And if someone attaches a mic to the iPod dock connector, can this be detected and used?

Good Question. I did just that. It seems that the iPod touch thinks that the input device is present and the call to AudioQueueStart returns 0. Good or bad, I don't know. I assume that this function should trigger the callback function to the delegate, but it only works in the simulator. This can be seen with the Speak Here app that is posted for examples. The debugger console shows a call to updateUserInterfaceOnAudioQueueStateChange when recording begins and when recording ends. On the iPod touch the call to the delegate is only done when recording stops.
I would also like to know how to test for an input device.

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Quote from: Yoshiro on 31-August-06, 13:20:15
I recently build a new computer using the MSI 975x mobo. The only problem is, I seem to have some issues reguarding sound input.
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Message was edited by: littleshoulders
Message was edited by: littleshoulders

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IPhone SDK - test for sound input availability?

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