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Aladdin in Nasira's Revenge (PC) - .ASF by Nicknine at 8:56 PM EDT on June 2, 2018
The game stores music in ASF files which appear to have unknown encoding although they do have a header. I assume the audio is 22050 Hz mono like in PS1 version. There's also a codec module called asfcodec.adl in the executable directory if it's any help.

Sample:
agra_1.asf

Codec file:
asfcodec.adl

edited 9:05 PM EDT June 2, 2018
by Nicknine at 9:27 PM EDT on June 2, 2018
Found this old thread. kode54 commented that it seems like modified Microsoft ADPCM. Must be a custom codec made by Argonaut Games. Some guy posted a decoder but without the source code.

edited 10:54 AM EDT June 3, 2018
by Nicknine at 6:11 PM EDT on June 3, 2018
The decoder produces PCM audio that is heavily distorted. Either I'm doing something wrong or the format has been changed since Croc 2.
by Nicknine at 2:47 AM EDT on June 25, 2018
Bump. Has anybody looked into this? I've decompiled the codec module and it doesn't look complicated so I think it's possible to reverse it.

edited 2:47 AM EDT June 25, 2018
by bnnm at 5:10 PM EDT on June 25, 2018
I tried before but assembly is not my thing. I saw a bunch of functions doing (seemingly) ADPCM nibble decoding, but I wasn't familiar with the algorithm (some stuff looked vaguely inpired by PS-ADPCM?).

If somebody properly describes it I could implement.
by bnnm at 7:03 PM EDT on July 17, 2018
I added this, output is roughly the same as croc2asf2raw, but I don't think decoding is 100% correct.

Here what I thought were the decoding functions in asfcodec.adl: https://pastebin.com/ni9H0j8y

Trying to decode like that didn't work, but I'm not sure about the meaning of some parts.
by Nicknine at 8:16 PM EDT on July 18, 2018
IDA Pro can produce pseudo-code from assembly, perhaps that can help?
by bnnm at 2:30 PM EDT on July 21, 2018
Hmmm, somehow can't find the option. I'm using "IDA Pro Free" (7.0?). I'll see if I can procure something better, or could you post the pseudo-code?
(decoding functions are the 4 long-ish subroutines just before the entry point/DLL main, I think).
by Nisto at 2:37 PM EDT on July 21, 2018
@bnnm: Pretty sure the free version doesn't ship with any decompilers, so look for a copy of IDA Pro.
by Nicknine at 12:43 AM EDT on July 22, 2018
@bnnm - Here you go:

Decompiled asfcodec.adl

edited 12:43 AM EDT July 22, 2018

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