From the iPhone 3Gs up, it’s possible to encode compressed AAC audio from PCM audio data. That means great things for apps that deal with audio sharing and transmission, as the audio can be sent in compressed form, rather than sending huge PCM audio files over the network. Apple’s produced some [sample code (iPhoneExtAudioFileConvertTest)](http://developer.apple.com/library/ios/samplecode/iPhoneExtAudioFileConvertTest/Introduction/Intro.html), which … Continue reading Easy AAC compressed audio conversion on iOS