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=Summary=
=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)
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)
=Message Format=
Below is the message format used for communicating with the AAC decoder. The same format is both when making requests and for responses, though the "request/response data" field changes appropriately.
Size : 0x20 bytes
{| class="wikitable" border="1"
|-
! Offset in bytes
! Type
! Description
|-
| 0x0
| u16
| Mode (Seems to be 0 = None, 1 = Decode AAC, 2 = Encode AAC)
|-
| 0x2
| DecoderCommand
| Command to be handled by the decoder (See information on DecoderCommand structure below)
|-
| 0x4
| u32
| Result Code
|-
| 0x8
| Request/Response data
| A 24-byte chunk of data containing information about the request/response. See below for more info.
|-
|}