The biggest hurdle to supporting AAC is licensing, if we were to write a software decoder and ship it with FMOD we’d need to pay licensing. We aren’t prepared to do that considering our main focus for codecs is on FSB and Studio Banks for which we already have great compression options.
We do support AAC in situations where the platform offers a decoder, in that case licensing is paid by the platform and not us.
We do have an open plugin format for codecs which you can see here. If you build your own decoder, or wrapper for an existing one you can interface it with FMOD.
Through a paid support contract we’d consider developing an adapter to allow an existing decoder such as faad2 or fdk-aac to operate with FMOD, distributed in source form. This would leave you to navigate any required licensing for the use of the technology.
But to answer your question directly, we have no plans to offer AAC as a built-in FMOD developed and licensed decoder.