Apple

Second question: as you can see below, I'm reading into a temporary byte/char buffer which is then converted into a float array. Is there a way to read float directly (I noticed the kAudioFormatIsFloat flag ...)?

Yes, that is possible. You can check out our simple wrapper class for an example implementation for that:

https://github.com/hfink/matchbox/blob/master/Xcode/WordMatch/AudioFileReader.hpp

https://github.com/hfink/matchbox/blob/master/Xcode/WordMatch/AudioFileReader.cpp

This implementation is very similar to DiracLE implementation posted in this thread previously, with the following minor differences:

It reads float directly, i.e. you don't have to deal with the float conversion by yourself

You can specify seek times in seconds

It's a C++ class

Be aware though there were a couple of problems reported regarding seeking within AAC compressed file, possibly due to some bug in the ExtAudioFile framework. (e.g. see http://lists.apple.com/archives/coreaudio-api/2011/Mar/msg00076.html) Reading consecutive float chunks should be no problem, though.

best regards,

References:
	>ExtAudioFile Basics (From: Jens-Oliver Fischer <email@hidden>)