MAME 0.201 is coming out in less than a week, and it occurs to me that there's a *lot* of audio improvements going into it, thanks to the efforts of the excellent superctr, cam900, and ValleyBell.
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Well, if you can get their contact info, ValleyBell did the current reverse-engineering of MAME's HLE QSound core. Otherwise, there's a verified accurate RE-ing of the QSound algorithm here: https://github.com/mamedev/mame/blob/master/src/devices/sound/qsoundhle.cpp … and .h - the CPP file is less than 1k lines of code.
If you want to know about the implementation itself, low-level emulation can be enabled using a well-placed #define QSOUND_LLE in here - https://github.com/mamedev/mame/blob/master/src/devices/sound/qsound.h … - at which point you can run a CPS-2 game in MAME with -debug on the command line, and directly see the DSP16 code.
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If you have any additional questions, feel free to hit me up!
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Wow, this is incredible! It'll take me quite a while before I have any questions, I'd imagine. This looks pretty involved, but I'm greatly looking forward to going through it! Thank you so much!
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