SDT (Sound Data)

What is SDT?

The SDT (Sound Data) file format is an archive format that contains one or many MPEG-2 Audio Layer II (*.mp2) files that are used for sound effects, speech, and music throughout the game. These files are usually uncompressed (in the archive), and the archive format is relatively simple.

File Format

File header

• 4 bytes: File count

For each file

• 4 bytes: File offset

For each file (at offset)

• 4 bytes: Header size
• 4 bytes: Data size
• 16 bytes: File name (usually null terminated)
• 4 bytes: Sample rate
• 4 bytes: Resolution
• 4 bytes: Sound type
  • 0: None
  • 2: WAV
  • 3: "Old WAV" (see https://github.com/ufdada/dk2-tools/blob/master/Formats/Sound/sdt_struct.bt)
  • 36: MP2, 64kbps mono
  • 37: MP2, 112kbps stereo
• 4 bytes: Unknown
• 4 bytes: Samples
• 4 bytes: Unknown
• n bytes: File data