XACT XWB XSB XGS Audio

XWB

• Format Type : Archive / Audio
  
• Endian Order : Little Endian
  
• Signature : WBND
  

Format Specifications

char {4}     - Header (WBND)
uint32 {4}   - Version (3)
uint32 {4}   - Size Of Header 1 (40)
uint32 {4}   - Size Of Header 2 (40)
uint32 {4}   - Offset To Details Directory (80)
uint32 {4}   - Length Of Details Directory
uint32 {4}   - Offset To Filename Directory
uint32 {4}   - Length Of Filename Directory
uint32 {4}   - First File Offset (8192)
uint32 {4}   - Unknown
uint16 {2}   - Unknown (1)
uint16 {2}   - Unknown (1)
uint32 {4}   - Number Of Files
char {16}    - Archive Filename (null) (without extension)
uint32 {4}   - Length Of Each Details Entry (24)
uint32 {4}   - Length Of Each Filename Entry (64)
uint32 {4}   - Max padding size between each file (2048)
uint32 {4}   - null

// for each file

uint16 {2}   - Unknown (0/2)

uint16 {2}   - Unknown (1)

uint32 {4}   - Unknown

uint32 {4}   - File Offset [+firstFileOffset]

uint32 {4}   - File Length

uint64 {8}   - null

// for each file

char {64}    - Filename (null) (without extension)

// for each file

byte {X}     - File Data

byte {0-2047}      - null Padding so the file length is a multiple of 2048 bytes)

Format Specifications #2

// ARCHIVE HEADER

char {4}     - Header (WBND)

uint32 {4}   - Version

// DIRECTORIES
// Strictly speaking you can seek past this section, it (always?) refers to 4 directories

// DIR 1 - WAVE BANK INFO

uint32 {4}   - Offset

uint32 {4}   - Length

// DIR 2 - FILE RECORDS

uint32 {4}   - Offset

uint32 {4}   - Length

// DIR 3 - ALWAYS EMPTY?

uint32 {4}   - Offset

uint32 {4}   - Length

// DIR 4 - FILE DATA

uint32 {4}   - Offset

uint32 {4}   - Length

// DIR 1 - WAVE BANK INFO

uint32 {4}   - Flags

uint32 {4}   - Number of files

byte {16}    - Wavebank name (Padded with 0's)

uint32 {4}   - Size of each file record (in dir 2)

uint32 {4}   - Size of each entry name block

uint32 {4}   - Offset of file data

uint32 {4}   - Always null?

// DIR 2 - FILE RECORDS

// FOR EACH FILE

uint16 {2}   - Number of channels

uint16 {2}   - Format tag (0=normal pcm) (1=xbox adpcm)

uint32 {4}   - Magic value

uint32 {4}   - File offset (Relative to start of DIR 4)

uint32 {4}   - File size

uint32 {4}   - Loop region offset (not sure what this does)

uint32 {4}   - Loop region length (not sure what this does)

// DUMPING FILES
Read the file records then seek to 'Offset of file data'(section 3) + File Offset.
The files are wav's so you need to write a .wav header first and then copy the data

Extra Checks:
The number of channels can be wrong, sometimes its given as 0 or even 15 and sometimes it indicates a stereo file when its actually mono. The bottom line is - dont trust the 'number of channels' value. The correct number of channels can be worked out from the 'magic value', below is the code I use to do this:

function TPsychoAudioDumper.RepairXboxChannels(Format, MagicValue,
 Channels: cardinal): integer;
var
  Temp: integer;
begin
  if format=0 then //Pcm
  begin
    Temp:=(MagicValue - 4) mod 32;
    if Temp=0 then
      Result:=1
    else
      Result:=2;
  end
  else
  if format=1 then //Adpcm
  begin
    Temp:=(MagicValue - 5) mod 32;
    if Temp=0 then
      Result:=1
    else
      Result:=2;
  end
  else
    Result:=1;
end;

Similarly, the samplerate is sometimes wrong, so to correct this:

function TPsychoAudioDumper.GetXboxSamplerate(Format, MagicValue,
  Channels: cardinal): integer;
begin
  if format=0 then //Pcm
  begin
    if Channels=1 then
    begin
      if MagicValue=2148894852 then //1 channel
        result:=44100
      else
      if MagicValue=2148507652 then //1 channel
        result:=32000
      else
      if MagicValue=2148189252 then //1 channel
        result:=22050
      else
      if MagicValue=705604 then //1 channel
        result:=22050
      else
      if MagicValue=352804 then //1 channel
        result:=11025
      else
      if MagicValue=256004 then //1 channel
        result:=8000
      else
        begin
          result:=0;
          if Assigned(FOnDebug) then
            FOnDebug('Unknown magic value! = ' + inttostr(magicvalue));
        end
    end
    else //2 channels
    begin
      if MagicValue=2148894856 then //2 channel
        result:=44100
      else
      if MagicValue=2148507656 then //2 channel
        result:=32000
      else
      if MagicValue=2148189256 then //2 channel
        result:=22050
      else
        begin
          result:=0;
          if Assigned(FOnDebug) then
            FOnDebug('Unknown magic value! = ' + inttostr(magicvalue));
        end
    end;
  end
  else
  if format=1 then //Adpcm
  begin
    Result:=(MagicValue - (1 + (Channels * 4))) div 32;
  end
  else
    Result:=0;
end;

Very rarely, the format tag is given as 2, this should be treated as format tag 0 - a normal pcm wave.

Notes and Comments

XWB files (Xbox Wavebanks) contain the audio data and are only used in the XBox version (and PC ports of XBOX games). XWB files are also used in many other XBox games, the specs here are only tested with Psychonauts though.

XWB files contain 2 types of audio:

PCM - Standard Wave PCM

Xbox ADPCM - As used by many Xbox games

The PCM audio can be played easily, to play the Xbox ADPCM however you either need to pass it through a decoder (there's one in Psychonauts Explorer) or install the Xbox ADPCM codec.

The Wavebank doesnt contain any file names. This is because these are stored in a seperate file - the SoundBank file (.xsb). See below for info on this.

XWB audio files may occur along with XNB Archives.

XGS

• Format Type : Misc
  
• Endian Order : Little Endian
  
• Signature : XGSF
  

Format Specifications

//header
4 bytes (char) - Signature // "XGSF"

// TODO

XSB

• Format Type : Misc
  
• Endian Order : Little Endian
  
• Signature : SDBK
  

Format Specifications

// ARCHIVE HEADER

char {4}     - Header (SDBK)

uint32 {4}   - ?

uint32 {4}   - Offset of wavebank name (Name is 16 bytes long)

byte {18}    - ?

uint16 {2}   - Number of files (File names)

byte {28}    - Soundbank name?

// FILE RECORDS

// FOR EACH FILE

uint32 {4}   - Offset of filename

uint32 {4}   - ?

uint32 {4}   - ?

uint32 {4}   - ?

uint32 {4}   - ?

Seek to 'Offset of filename' and read the filename (it is null terminated).

I assume that the order of the filenames in the SoundBank corresponds to the order of the files in the WaveBank, but I dont know for sure. Be aware that sometimes there are more entries in a WaveBank than there are file names in a SoundBank, so some files have no name.

Notes and Comments

XBox Soundbanks contain the file names for the files in their corresponding Wavebank, along with other, unknown data.

The name of the SoundBank corresponds to the WaveBank usually, eg ASMusic.xwb and ASMusic.xsb. If in doubt though, the SoundBank referrs to its WaveBank internally, so you can check.

Some WaveBanks do not have a corresponding SoundBank.

Other Info

quickBMS Script

Not written yet.

Compatible Programs

• foobar2000 + vgmstream plugin
• Game Extractor
  
• Psychonauts Explorer
  

Other Games

These games use this file format

• Bleed (PC) (*.XWB / *.XGS / *.XSB)
• Full Spectrum Warrior *.xwb
• Ghost Recon 2 (XBox) *.xwb
• Powerdrome *.xwb
• Psychonauts *.xwb
• Return To Castle Wolfenstein: Tide Of War (XBox) *.xwb
• Star Trek Shattered Universe (XBox) *.xwb
• Sudeki *.xwb
• Unreal Championship 2: The Liandri Conflict (XBox) *.xwb