DivaDocs

WIP documentation for Project Diva F 2nd modding

this repository serves as a hub for documenting discoveries, tools, formats and other useful info to assist with modding Hatsune Miku: Project Diva F 2nd on original hardware. the repository will be updated as new info is discovered.

current findings

• the game uses common formats like .avc, .ogg and .psarc, as well as proprietary formats like .farc (possibly standing for File Archive?)
• the game installs assets on first launch. comparing the installed data size with the data.psarc file reveals that those files will likely have to be modified on disk
• data.psarc features encrypted .farc files, as well as a few .txt files encrypted with the custom DIVAFILE protocol
• DIVAFILE's decryption routine can be found within the Japanese copy of the game
• stage lighting is stored in "XX###_STAGE.LIT" as well as fog parameters in "XX###.FOG"
• the game features Nvidia's Cg (C for Graphics) shaders with what seems to be intense compiler optimizations and next-to-none human readability

tools

useful tools to help with manipulating and packing files:

• QuickBMS - all purpose general archive unpacking/repacking with game/format specific scripts (in this case, the Virtua Fighter 5 script)
• UnPSARC - .psarc file unpacking
• ffmpeg - media format transcoding (.avc and .ogg)
• ps3dec - .iso decryption and extraction
• multiMAN - general purpose back-up and file manager for PS3

to-do

• investigate .LIT and .FOG files
• check if removing data.psarc changes anything after the install process is completed
• find out why QuickBMS complains about the file header being FARC instead of FArC
• further investigate the Cg shaders in shaders_ps3.farc

contributing

if you have any knowledge on this game's inner workings, either submit a pull request with your findings or contact @memroyleak on Discord