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Jul - The Cutting Room Floor - How do I rip Sega Genesis music? New poll - New thread - New reply
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AttackedbyGlitch
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Posted on 11-19-11 12:13:02 AM Link | Quote
I would like to know how to manually rip music from Sega Genesis ROMs, because I think the title theme from Super Donkey Kong '99 is longer than what plays ingame. Could someone please tell me how to rip Genesis music?
paulguy

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Posted on 11-19-11 03:59:36 AM Link | Quote
Paulguy's Post configuration
I imagine some emulators have an option for this, right?

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Aoi
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Posted on 11-19-11 04:37:00 AM (last edited by Aoi at 11-19-11 03:29 AM) Link | Quote
Don't most of those (if not all) just basically copy what's being played, rather than rip the actual sound/music data from within the game? (Or, at least, that's the way it was the last time I looked into what the emulators could do with VGM/GYM...)
paulguy

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Posted on 11-19-11 01:53:18 PM Link | Quote
Paulguy's Post configuration
Well, that's pretty much all you can do. It basically makes a saved state with the bare essentials required to play the music. You can't really universally rip a game's pattern and sample data since different games will store things differently.

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ICEknight
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Posted on 11-19-11 04:29:32 PM Link | Quote
Originally posted by paulguy
Well, that's pretty much all you can do. It basically makes a saved state with the bare essentials required to play the music. You can't really universally rip a game's pattern and sample data since different games will store things differently.

Not universally, but there's many Mega Drive sound drivers that have been documented to the point that it's possible to rip their music by extracting it from the ROM rather than logging it with an emulator.

It's something that sadly has never had much support from the communities, in favor of logged music formats like VGM but, for example,the "M1" player supports reading music directly from many Genesis ROMs (and arcade games, for that matter).
paulguy

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Posted on 11-19-11 09:15:44 PM Link | Quote
Paulguy's Post configuration
It's impractical to reverse engineer every video game's music engine, especially when the same music engine can have different variations for every game that uses it. And beyond that, just getting 1 music engine reverse engineered and handling every little quirk is a huge undertaking. People even find errors in stuff like mature MOD or XM playback engines that aren't based on the original code to this day. Better to just have a file with the contents of memory that contains the music engine and music data and interpret that. Much more practical, and assuming you have an accurate emulator, it should be bit-exact output, and having something like an accurate emulator for all sega genesis games is much more useful than an accurate emulator to play music for a handful of games.

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Rachel Mae

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Posted on 11-19-11 10:09:04 PM Link | Quote
Originally posted by paulguy
Better to just have a file with the contents of memory that contains the music engine and music data and interpret that.
Except VGM has neither of those. It is literally just a log of the data that is sent to the sound chips in real time. This means it has to be looped and timed manually, and many bugs and quirks in the music data or sound engine cannot be easily reproduced (e.g. a channel going out of sync, tempo or pitch gradually increasing, instruments changing in subsequent loops).

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Posted on 11-19-11 11:46:00 PM Link | Quote
I was under the impression VGM was a bit more than that, because I'm pretty sure that leaving things infinitely looping does reveal some of those things (like the slipping backing track in Flying Battery Zone, StH3).

Your best bet would be to find a sound test or music modifier code so that you can play the music on an area that won't interrupt it.

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paulguy

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Posted on 11-20-11 03:01:54 AM Link | Quote
Paulguy's Post configuration
.gym is the one that just records the data written to the ym data ports. As far as I know a .vgm is more involved, along the lines of a .nsf.

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ICEknight
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Posted on 11-20-11 06:30:10 PM (last edited by ICEknight at 11-20-11 03:46 PM) Link | Quote
Originally posted by paulguy
.gym is the one that just records the data written to the ym data ports. As far as I know a .vgm is more involved, along the lines of a .nsf.

Both GYMs and VGMs are logged formats, while NSFs are made out of data directly taken from the ROM. It's just that GYMs don't loop, while VGMs do, after doing some trimming and manually setting the looping point.

VGMs are useful as smaller MP3s that require an emulator, but not for preservation or research purposes.


Some stuff you can find in music read from ROM data, but not in logged music:
  • Any music that's not referenced within the game's code (like Sonic 4's boss music in Sonic 3D Blast, I think).
  • Any undocumented behavior the music tracks might feature after a specific number of loops (Sonic 3's music getting out of sync, Totaka's song in any of the many games it's been featured).




EDIT: Kind of relevant, here's a topic at SMSpower where I had a go at comparing some Master System VGM rips with their respective ROM data. Unsurprisingly, I started finding tons of unused stuff that VGM rippers never knew about (nor seem to care much about, either).
AttackedbyGlitch
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Posted on 11-20-11 07:04:08 PM Link | Quote
It appears that Super Donkey Kong '99's sound engine is also used in other games. See here: http://forums.sonicretro.org/index.php?showtopic=26350
ICEknight
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Posted on 11-20-11 07:07:16 PM Link | Quote
Originally posted by AttackedbyGlitch
It appears that Super Donkey Kong '99's sound engine is also used in other games. See here: http://forums.sonicretro.org/index.php?showtopic=26350

...You're linking to this very topic. =P


Here's a list of all the known sound drivers for the Mega Drive.
Mike
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Posted on 11-20-11 07:42:55 PM Link | Quote
Try Kega, Xega or use Gens+, if the authors are still active active in the sega emulation area it will already have this feature implanted.
Check under the preference tabs or options menu and see if it has it.


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Jul - The Cutting Room Floor - How do I rip Sega Genesis music? New poll - New thread - New reply


Rusted Logic
Acmlmboard - commit 47be4dc [2021-08-23]
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