Audio

Table of contents

• BD
• PHD
  • Head
  • Vagi
• AT3
• CAF (iOS)

BD

File that stores appended headerless PSX (VAG) audio files.

Can decode using vgmstream and a txth to state the audio file settings.

Create a file called .TXTH with the following in it:

codec = PSX
sample_rate = 16000
channels = 1
num_samples = data_size

PHD

PHD files are effectively the header files for BD’s and have 4 sections… Head, Prog, Smpl and Vagi.

Head

struct HEADHeader{
    uint    FileID;
    uint    SizeOfHead;
    uint    Unk;
    uint    SizeOfPHD;
    uint    SizeOfBD;
    uint    ProgPTR
    uint    SmplPTR
    uint    VagiPTR
}

Could be that Unk is saying theres 3 sections after Head… that being Prog, Smpl, and Vagi.

Vagi

struct VAGIHeader{
    uint    FileID;
    uint    SizeOfVagi;
    uint    NumOfFiles;
    uint    TERM;
}

TERM seems to just terminate with FF FF FF FF

Followed by each file reference.

struct VAGIFileRef{
    uint    Offset;
    uint    Size;
    uint    NULL;
    uint    Frequency;
    uint    NULL;
}

AT3

Sony’s generic ATRAC3 audio files

CAF (iOS)

Generic Apple Core Audio Format used on iOS.