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Nuked OPL3 emulator

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Reply 20 of 33, by nukeykt

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Stretch wrote:

Does Nuked OPL3 emu have a rockbox port? Would it be faster than dosbox or MAME OPL on portable audio players?

No, it doesn't. And my emulator slower than DOSBox and MAME, i haven't done any big optimizations in code, because my goal is accuracy to real YMF262.

Reply 21 of 33, by Wohlstand

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I tried to use your emulator in libADLMIDI instead of pre-used DosBox's and I played some MIDI files with DOOM banks, and I hear a some different sound of Hi-Hats in comparison with my real Sound Blaster 16 which I have at me, even I tried to play with no resampling with 49716 hz sample rate. Anyway, real SB has louder bass (in comparison to both DosBox's and your). But I think, I'll try to power on my machine with SB-16 and I'll try to record something to compare

Reply 23 of 33, by Wohlstand

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I think, yea, even in ZDoom hi-hats are sounding fine and seems need a small calibration of that thing. I will add it to be macro-switchable (I using libADLMIDI also on Android phones where optimization is very recommended to don't eat CPU and battery, I built a little player for myself to listen MIDIs without pre-rendering them into OGGs with ability to toggle banks and chip properties which I very like to do, even I editing MIDI-files and changing their instruments and producing some remakes or arranges to listen them more convenient or just improve quality of partiture itself, because previous composer was too lazy to write a good orchestra partiture with all necessary expressions)

EDIT: Thanks for the reply at GitHub (https://github.com/Wohlstand/libADLMIDI/issues/2, a fourth reply), reason was a wrong bend coefficient, so, hi-hats are sounding perfect! 😎

Reply 24 of 33, by HunterZ

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Just tried this via DOSBox ECE SVN r4007, and it doesn't fare any better at Wizardry 7's perverted use of the OPL2 as a DAC. Is this a DOSBox mixer limitation or an OPL emulation limitation?

Reply 25 of 33, by Jepael

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HunterZ wrote:

Just tried this via DOSBox ECE SVN r4007, and it doesn't fare any better at Wizardry 7's perverted use of the OPL2 as a DAC. Is this a DOSBox mixer limitation or an OPL emulation limitation?

It's been a while since I last checked, but most likely cause is that the OPL chip emulation code is told to render several samples per call, so it's not the fault of the chip emulation itself.
Emulating PCM output would require to have the register writes to affect each output sample immediately.

Related to this, I've heard some weird sound issues on at least one Sierra game, like a sound playing for a brief moment at incorrect volume/octave/pitch or something, which only means a block of emulated sound is generated while game is in the middle of updating the chip registers. Fortunately, this is not an issue on most of the OPL stuff.

Reply 26 of 33, by NewRisingSun

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DOSBox-X has the sampleaccurate option, which permits emulation of samples-via-OPL.

One of my more quixotic plans is to rewrite DOSBox' mixer using the blip_buffer library, which allows for a clean way to handle such cases, supports equalization, filters and reverb, and allows for very exact yet simple emulation of advanced PC speaker techniques. The filter support would permit emulating the SBPro's selectable filter, and equalization and reverb would provide a simple way to implement support for the Adlib Gold's surround board.

Reply 27 of 33, by HunterZ

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Last I checked, DOSBox-X is broken such that D-Fend Reloaded won't work with it, so I haven't messed with it.

Would love to see Adlib Gold emulation. Dune was supposedly made with it in mind.

Reply 30 of 33, by superfury

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Just a little question, can you see in my OPL2 emulator what's going wrong with the drum instruments? Somehow(drumkit based on OPL3EMU's fmopl.c) it doesn't sound completely right, even though the normal melodic channels work 100%:
https://bitbucket.org/superfury/unipcemu/src/ … lib.c?at=master

The adlibsample function and subfunctions generate all OPL2 samples. The first part when adlibpercussion is set are the failing percussion instruments. The part immediately after(the if clause and contents) is the working melodic channel processing.

Anyone?

UniPCemu Git repository
UniPCemu for Android, Windows and PSP on itch.io
Older UniPCemu PC/Android/PSP releases

Reply 32 of 33, by nukeykt

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datajake1999 wrote:

According to Wikipedia, the YMF262 was released in 1988,. This means that a 100% perfect OPL3 emulator was released on the YMF262's 30th anniversary. Interesting.

Actuially YMF262 was developed in 1990 and first released in 1991(on Sound Blaster Pro 2).

Reply 33 of 33, by datajake1999

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Here is my WAV file writer for OPL3 emulation, as well as a VGM logger and code for writing to hardware OPL3 using inpout32.dll.
Edit: Added code for a silence generator.
Edit 2: Added code for audio processing. This is useful for basic DAC emulation and channel manipulation.

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