AAC Audio File Repair

I need an experienced developer to write a module/function/category in objective-c to repair corrupted M4A audio files that encoded with AAC. NDA signature is required to get a sample corrupted file. Here is how it works: 1. Bid to get a copy of the sample file 2. Write your code and fix the file to be playable 3. Send me the results to get awarded and paid at the same time.