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Core Audio, the only media framework available since Day One of the public iPhone SDK, offers extremely low latency and powerful access to the device's audio processing system...assuming you can handle what's known as one of the hardest APIs on the platform. In iOS 5, Core Audio gets even better, with great new features that had previous been burdensome, if not impossible, to develop on your own. You will learn the basics of Core Audio -- the engine APIs that process sound (Audio Queue, Audio Units, and OpenAL) and the helper APIs that get samples into and out of them -- and then look where iOS 5 fills in some of the holes that have existed up to now.
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