TheAmazingAudioEngine/TheAmazingAudioEngine — pull request #71 by manide (2014-01-12 18:51:06+00:00)
Title: Fixed bug calculating NSTimeInterval to timeStamps that are in the past

Time difference is calculated from two uint64_t (unsigned) values. To get correct results when the first value is less than the second value, we have to cast the result to an int64_t (signed) value.