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#11
06-29-2005
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#14
06-29-2005
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| BTW - another update: My theory on music longer than 30 secs (over 500kb) is correct - the music will NOT play, but the eboot WILL run (it will just be a waste of MS space!). *** All of the info in this thread relates to tests on PSP with firmware 1.5 using the KXploit homebrew method. (should have mentioned that earlier i feel!) PSPSwampy. |
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#15
06-29-2005
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| cheers. |
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#16
06-30-2005
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#17
06-30-2005
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i've done a little more poking around with a hex editor, and also found this site... http://www.sonicspot.com/guide/wavefiles.html it look slike the 'smpl' chunk in the header controls looping, but i haven't had any luck putting that in and having it work. i'll have a file that plays one shot, but when i put in my best guess at a smple chunk, it won't play any more. i know thats where looping occurs, because i was able to take the smple chunk out of a save game looping file and it no longer looped... side note... some of these saves have snd0.at3 files that have funky headers - which is probably why they don't open with the codec? wipeout pure and midnight club dub are examples... they have an undefined number in the format compression code bit. so maybe theres another proprietary codec being used as well? or just a spin on the atrac3? my boss is out for the rest of the week, so i'll continue messing with this...  anyone else?
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#18
06-30-2005
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Nice find adam12 - good info on that site. I've been having a play with the SND0.at3 from wipeout pure save game (from folder UCUS98612P0000) and i've found the "switch" for looping which was HEX 01 (for continous loop) within the SMPL chunk (Can't remember the exact position, but there's no guarentee your's is exactly the same anyway). I've been looking into this info to try and setup my own loops, but alas no joy (yet). Man it's a bit of a headache looking at hex (I'd forgotten, as i haven't played with hex since my Amiga days!) We'll get there eventually - at least we can play SOMETHING now! Need a nice little util to properly examine the AT3 file and read each chunk out seperately for "browsing"  I'm sure there must be one somewhere (but since its $ony's own custom file structure i think we'll have trouble getting our hands on it!). Oh well - I'll keep you posted if i find anything new. PSPSwampy. |
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#19
06-30-2005
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yeah, i have the wipeout at3 in front of me as well... its one of the ones that i can't open with the codec. if you look at the fmt 'chunk', theres a few extra bytes in there when compared to a file that you make with the codec. also, the compression code is 0xFFFE which is proprietary. the at3 file that i'm able to open is from hotshots golf (i think :\) - which has a compression code of 0x0270 (maybe just the 02 is used which is PCM wav). and as far as the looping goes, i've been messing with that too, but the hangup is the loop start and end values... in all the files i've looked at, i can't make any sense of them. hex... :| still hacking away... just a description of the proprietary fields would be nice - could that be in the $dk somewhere?
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#20
06-30-2005
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dude!!! made it loop. its not super clean yet (kinda hiccups), but i've got something working... it could also be that my file isn't a perfect loop. i had to add a bunch of stuff to the header in a hex editor - i'll play with it a bit more and see about writing up a step by step tonight... well that was a productive day at work - going home now. :P |
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