DSP AAC Decoder

Note that everything below may vary depending on the exact DSP firmware used and different variants have slightly different behaviours.

Summary

Some versions of the DSP firmware contain a decoder for the AAC audio codec. Such firmware may be dumped from specific games, like Pokemon X/Y or Rhythm Heaven Megamix. Interfacing with the AAC decoder (sending requests/receiving responses) happens via the DSP binary pipe (pipe 3)