I have a project where I need to output through the device's speakers the input that comes in through either a line-in input, or an accessory connected to the 30-pin connector. Whilst working on the line-in input, I'm finding it hard to detect whether there is input from line-in, and how to get the input from this source and then replay the buffer through the speaker. Trying to get the property of kAudioSessionProperty_InputSource(s) for example is returning nothing.
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Which iOS version? There appears to be no API to support doing this on iOS 5.1 and older. – hotpaw2 Jul 04 '12 at 17:33
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That might make a good question for Apple's devforums where beta OS discussions seem to be allowed by the developer agreement. – hotpaw2 Jul 04 '12 at 21:08