DSP AAC Decoder: Difference between revisions
Documentation of the DSP AAC firmware |
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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. | |||
|- | |||
|} | |||