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I was looking for /dev/dsp or /dev/audio through terminal but I couldn't find either of the two. Is there any audio device on iOS 4 (specifically iPhone 4) for input or output?

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This technical question is probably more appropriate for stackoverflow.com than on apple.stackexchange. –  hotpaw2 Oct 7 '11 at 22:42
    
Welcome to Ask Different! Questions about development are off-topic for this site. You might try www.stackoverflow.com. Please take a look at the FAQs for more info. Thanks. –  Nathan Greenstein Oct 8 '11 at 1:48
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closed as off topic by Nathan Greenstein Oct 8 '11 at 1:48

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The only exposed API to use the audio hardware under iOS is the RemoteIO Audio Unit API. The driver for the audio input/output hardware does not seem to be exposed via a *nix device on Mac OS X, or in its iDevice derivatives.

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