Later some were sliced up and they kept working.Īfter that came undubs where usually Japanese audio in the form of a whole SDAT file was stuck in a US or EU rom and it usually made the game have the Japanese audio. The first hacks to it were simple swaps to lower file sizes when people were still using GBA era devices with as little as 16 megabytes of space on them (more often 32). STRM- usually some PCM or ADPCM and can go right to full audio tracks (some of the Tony Hawk games had them including files outside the SDAT). SWAR (SWAV)- small PCM or ADPCM samples that either stand alone or are used as instruments for SSEQ.
SSEQ- analogous somewhat to midi and/or tracker formats It is a full audio format with three types of audio playback supported although there are helper files. SDAT however is the container file for it all (occasionally you can see files outside them) The DS SDK format and one used by the vast majority of games however the games that do not use it with the possible exception of el tigre make my mule are noteworthy games in the DS library so it might well be worth the time having a look at the others. To this end a quick overview of the state of things. I am not intending to go into music games and their formats with the aim of custom songs in those at this point but if it is there I will quite happily fiddle with it. As a rule of thumb everything that is not SDAT is a simple format, a known format, a wrapper of some form for a common format or something just wrapped around plain wave- to my knowledge there are no alternative tracker/sequencer formats with all the alt formats being some form of straight digitised wave form (although things can be layered across the various channels) save perhaps some of the things the music games do and maybe disgaea depending on how you look at it.
Most people that hang around DS hacking eventually come across audio hacking which has been covered elsewhere but I feel like covering it again and maybe doing a bit more research into various things some of which was done as I was typing this up.
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