This snddata.obj file is the bane of my existence! Urgent help required! by simonmkwii at 2:42 AM EDT on October 13, 2017
Turns out this file is in all of the GameCube games developed by Nintendo Software Technology, and it contains sound effect data in the ADPCM format, but it is packed in a container that no-one has ever reverse engineered!

The games it is in are:
1080° Avalanche (Confirmed)
Wave Race: Blue Storm (Important! Contains the condescending announcer easter egg!) (Confirmed)
Nintendo Puzzle Collection (Unconfirmed)
The Legend Of Zelda: Collector's Edition (Unconfirmed)

Here is the file from Wave Race: Blue Storm!

I would upload the file from 1080° Avalanche as well, but my disc is a bit scratched and my Wii gives up halfway through copying the file.

Note: The file header begins with "SNDFILE" if that helps.

edited 2:43 AM EDT October 13, 2017

edited 6:05 AM EDT October 13, 2017
by furrybob at 10:54 AM EDT on October 13, 2017
The .obj file's a simple archive. Once you've extracted that, you'd have the individual file formats to deal with.

The archive has the structure:

char Signature[8];
uint32 FileCount;
uint32 Size;
char Padding?[16];
FileDesc Files[FileCount];

struct FileDesc
char Filename[32];
uint32 Offset;
uint32 Size;
char Padding?[24];
More help needed! by simonmkwii at 11:36 PM EDT on October 17, 2017
I have been trying nonstop and I cannot for the life of me figure out how to correctly implement that file structure in C code to unpack the archive!
I cannot do it! by simonmkwii at 4:28 AM EDT on October 18, 2017
I am still unable to extract it!

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