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How to use AVAudioRecorder data and convert it to raw sound for C ++?

I was looking for where to get the microphone input on a Mac, and the Objective C AVAudioRecorder class appeared. I was able to write the audio to a file, but how can I use AVAudioRecorder and then convert the Core Audio Format data to the original sound for use in C ++ code e.g. PocketSphinx? Thanks

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The audio stream API and RemoteIO audio device will allow you to receive the original sound buffers from the microphone on iOS devices.

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