Mogg File Format Details

**Kells** · Joined: 23 Aug 2006 Posts: 10

First of all let's recap all of xorloser's brilliant work.

PS2 hdr/ark file parsing/extraction/restricted replacement .... was already done.

PS2 hdr/ark file parsing/extraction/replacing files with no restrictions on file placement or size ....... CHECK!

Xbox360 hdr/ark decryption/parsiing/extraction/replacing files with no restrictions on file placement or size ....... CHECK!

Rockband (PS2 and Xbox360) hdr/ark decryption/parsing/extraction/replacement with no restrictions on file placement or size ...... check!!

GH2 DTB Decryption to allow us to edit dtb's from ALL games... CHECK!

Rockband (and GH2 DLC) X360 Mogg decryption/encryption ..... CHECK!

Rockband PS2 PSS/VGS decryption/encryption .... CHECK!

Excellent work mate .... now for my question ...

Now that rockband moggs for the x360 are able to be extracted and decrypted properly, has anyone looked at them closely yet?

When you do, you'll notice a bunch of bytes at the beginning of the file .. quite a few actually ... scroll through them until you find the OggS header later on. We are trying to figure out what those bytes are!? I suspect they are the main reason why Audacity chokes on decrypted moggs. If you delete those bytes, you can open the oggs fine in Audacity and check out Black Hole Sun in all it's 14 track glory heh

.

Help the scene figure out what this info is and how to generate it ;)

Thanks.

**Kells** · Joined: 23 Aug 2006 Posts: 10

see below

**xorloser** · Joined: 06 Mar 2008 Posts: 68

these are structs for the header that kells mentions.
Note that a mogg file has the following layout:

MoggHeader
MoggEntry_0
MoggEntry_1
...
MoggEntry_n
MoggKey
Ogg Vorbis File

typedef struct {
int version; // 0xA = unencrypted, 0xB = encrypted
int headerSize; // this is the offset of the start of the ogg file
int numChannels; // number of channels in the mogg? not 100% sure on this..
int unknown; // 0x4E20 : 20000 (some kind of max packet/chunk size?)
int numEntries; // number of MoggEntrys following this
} MoggHeader;

typedef struct {
unsigned int fileOffset; // these are multiples of 0x8000
unsigned int unknown; // time offset into ogg stream?
} MoggEntry;

typedef struct {
unsigned char key[16];
} MoggKey;

I am guessing we need to work out what the MoggEntrys are and how they are generated to make custom tracks. I have not tried using an ogg file without this special header stuff to see if it'll work however. What have people done so far when they have made custom songs for the guitar hero games?

These special headers are not part of the ogg standard. (I looked into the "skeleton" headers that someone mentioned and it turns out they are part of the ogg format and so are stored inside the ogg file.) These special headers are present before the ogg file beings.

As for audacity it seems to load files whose special headers are less than or equal to 0x2000 bytes. I had a quick look at the audacity sourcecode and i think this is due to it using a 0x2000 byte buffer to find the start of the ogg file, so for files with a special header that is bigger than 0x2000 bytes it will not find the start of the ogg file. There are only 2 files I've found for which this applies, the 2 biggest songs in rockband foreplay and greengrass. In the case that audacity will not open the file, you can remove the special headers and it will then open them ok.

**ccfman2004** · Joined: 09 Jan 2008 Posts: 128

How do I extract the OGG files from the 360 version of the game and decrypt them?

Please link to a forum thread if necessary.

**Kells** · Joined: 23 Aug 2006 Posts: 10

Staff Edit: Removed. Read more here.

grab the ArkTool w Gui ...

run ArkToolGui.exe ... open the ark/hdr file by browsing to the directory that they reside in.

ensure under the Options menu that "Perform Crypts" is checked off (this is the default)

navigate to the *.mogg file you want to extract, right click it and select extract.

ArkToolGui.exe will automagically decrypt the mogg when you extract it.

**cool--ethan** · Joined: 25 Mar 2007 Posts: 244

**ccfman2004** · Joined: 09 Jan 2008 Posts: 128

**Kells** · Joined: 23 Aug 2006 Posts: 10

**ccfman2004** · Joined: 09 Jan 2008 Posts: 128

I've extracted some of the DLC Content from my 360 Hard Drive.

How do I decrypt the .MOGG file I have?

BTW, I am a Mac programmer, I'll see if I port the code to Mac this way I don't have to open up Parallels every time I want to use this program.

When I finish, I'll post it here.

**xorloser** · Joined: 06 Mar 2008 Posts: 68

also included in the arktool v6.0 package is a tool called SongCrypt, you can use this to decrypt individual files such as those you have extracted from DLC.

**Bluzer** · Joined: 05 Apr 2008 Posts: 2

**Cheesus** · Joined: 11 Feb 2008 Posts: 7

THANK YOU so much for the tools!

One thing I've noticed is that .mogg files over 50MB do not load into Audacity. They "load" but with the same behavior as being undecryped (no channels, plays with 3-4 seconds of gibberish). In particuar, a song like "foreplaylongtime" and the RB version of "greengrass"

Can you determine whether this is a problem with the decyptor or Audacity?

**SixStringedBass** · Joined: 14 Jul 2007 Posts: 181

**Cheesus** · Joined: 11 Feb 2008 Posts: 7

Can't believe I missed that. Thanks.

**Unsteadycarrot** · Joined: 28 Dec 2006 Posts: 626 Location: Solihull/england

im trying to get the ps2 audio files out but i dont know how to get the ogg file :|...do i extract the pss? if so...then what do i do with the vgs?...i thought it was meant toturn it into an ogg...im hopeless with this kind of stuff sometimes, i really am.
_________________