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Droolie, posted Wed Feb 25, 2015 3:56 pm (3465)

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Hey there!

I'm looking to decode the Ubisoft MPEG files found in Tonic Trouble, and I'd be forever grateful if anyone could help. I've posted this on various forums without any help, so I'm hoping I'll have some luck here.

Here are some examples of stereo Ubisoft MPEG files: https://app.box.com/s/4a8u0kbfe1izlewedqjl
Here are 3 examples of mono Ubisoft MPEG files (they're voice tracks): https://app.box.com/s/qypjqe1pypd9dtmncern
It seems that much like normal MPEG audio, stereo files have 1 frame for left channel, 1 frame for right channel, and then repeat.

The tracks seem to be 16-bit 44100Hz files, and from what I've found, the format is a bit like this:

Code:

0x4 - the amount of samples of the audio track. Seems to be used only for loop length.
0x4 - "2RUS" header for stereo, "1RUS" header for mono
0x??- frame header, starting with at least 8 "on" bits (11111111). This start is just like MPEG, but the rest of the header isn't...
[ frame ]
0x?? - frame header, seems to be padded to nibble level (as in, there can be 4 "on" bits at the end of one byte and 4 at the beginning of the following byte)
[ frame ]
etc.

Many thanks,
Droolie.

aluigi, posted Wed Feb 25, 2015 4:25 pm (3466)

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I think you need decubisnd.
Have you already tried it?
https://bitbucket.org/Zenchreal/decubisnd/downloads

Droolie, posted Wed Feb 25, 2015 4:51 pm (3468)

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Yeah, I have, but DecUbiSnd doesn't support that format.

deton24, posted Sat Sep 28, 2019 10:23 pm (51066)

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Converter has been released with source codes:
http://www.ctpax-x.org/?goto=files&show=161

You can consider donating CTPAX-X on Kiwi, Yandex Money, Webmoney (data provided in the left of the main page) helping them keep their site online.

Thanks to aluigi for providing QuickBMS script extracting MPX segments!