JMA Compression

Astxist · Post by **Astxist** » Mon Jan 24, 2005 11:43 am

Nach wrote:The future is now.
Go forth and compress.

Lol, will do.

Astxist

Player1 · Post by **Player1** » Tue Jan 25, 2005 7:44 pm

What about a shell registration, that you can simply select roms, klick with the right mouse button on the selection in the explorer and select compress to jma like winzip or 7zip?

Post by **Nach** » Tue Jan 25, 2005 7:54 pm

I'll look through my old notes later and see if I can whip up something that can do that for you.

anewuser · Post by **anewuser** » Tue Jan 25, 2005 8:10 pm

What about a batch file in the sendto folder?

Post by **Nach** » Tue Jan 25, 2005 8:15 pm

anewuser wrote:What about a batch file in the sendto folder?

That's basically what I'm going to be doing.

Post by **Nach** » Tue Jan 25, 2005 11:49 pm

Okay, I looked through my notes, but bear in mind I didn't test this yet.

To make a converter for when right clicking on directories:

Code: Select all

REGEDIT4

[HKEY_CLASSES_ROOT\Directory\shell\JMA]
@="Convert SNES ROMs to JMA"

[HKEY_CLASSES_ROOT\Directory\shell\JMA\command]
@="c:\\nsrt_dir\\nsrt.exe -r -savetype jma -rename %1"

Of course modify the drive and directory to NSRT as appropriate. You can also change which rename type you want there.

Save that as a .reg file and double click it for Windows to integrate it.

For various filetypes, change Directory to .sfc or whatever extension you want to bind for, and remove the -r in the NSRT command.

Any questions?

Cecil · Post by **Cecil** » Wed Jan 26, 2005 1:04 am

I have a question. Is there any way to compress a ROM that nsrt doesn't recognize? I have a bunch of english patched ROMs that NSRT won't compress (Like Star Ocean & ToP, among others).

Post by **Nach** » Wed Jan 26, 2005 1:07 am

Cecil wrote:I have a question. Is there any way to compress a ROM that nsrt doesn't recognize? I have a bunch of english patched ROMs that NSRT won't compress (Like Star Ocean & ToP, among others).

Currently no, but next release it will be possible.

Cecil · Post by **Cecil** » Wed Jan 26, 2005 1:14 am

Nach wrote:
Cecil wrote:I have a question. Is there any way to compress a ROM that nsrt doesn't recognize? I have a bunch of english patched ROMs that NSRT won't compress (Like Star Ocean & ToP, among others).
Currently no, but next release it will be possible.

Ok, I can wait. Great work on all of this!

Post by **Nach** » Wed Jan 26, 2005 1:17 am

Cecil wrote:
Nach wrote:
Cecil wrote:I have a question. Is there any way to compress a ROM that nsrt doesn't recognize? I have a bunch of english patched ROMs that NSRT won't compress (Like Star Ocean & ToP, among others).
Currently no, but next release it will be possible.
Ok, I can wait. Great work on all of this!

So how much space did you save with JMA so far?

Cecil · Post by **Cecil** » Wed Jan 26, 2005 1:19 am

Nach wrote:
Cecil wrote:
Nach wrote:
Cecil wrote:I have a question. Is there any way to compress a ROM that nsrt doesn't recognize? I have a bunch of english patched ROMs that NSRT won't compress (Like Star Ocean & ToP, among others).
Currently no, but next release it will be possible.
Ok, I can wait. Great work on all of this!
So how much space did you save with JMA so far?

Uh... I forgot to check.

I'll go do a comparison right now.

Edit: Before, with zip format - 34MB
After, with jma format - 30.4MB

So I saved 3.6MB. That's just with the ROMs on my hard drive. I have a bunch of ROMs on a cd as well that I'm going to convert after NSRT can compress ROMs it doesn't recognize, whenever that'll be.

deathtok · Post by **deathtok** » Wed Jan 26, 2005 5:09 am

I saved a smooth 10MB for my small collection. That really is cool. Anyway, thanks for creating a good compression format and sharing.

Player1 · Post by **Player1** » Wed Jan 26, 2005 11:39 am

Is the Jma format compatible to any other formats out there? I would just like to know if you for example want to know what files a jma file contains.

If jma is that good for roms, are the jma specs free that it can be adopted by other emulators also?

thanks to nach and all other developers

Stifu · Post by **Stifu** » Wed Jan 26, 2005 12:21 pm

Player1 wrote:If jma is that good for roms, are the jma specs free that it can be adopted by other emulators also?

If I got things right, this is a compression format optimized for *SNES* ROMs, not for ROMs in general...
And ZSNES and Snes9x, the 2 biggest SNES emulators, support JMA already... I don't think Nach would mind sharing with other SNES emu authors, but I can't speak for him.

Post by **grinvader** » Wed Jan 26, 2005 1:40 pm

Nach is currently adding JMA support into sneese.

JMA is a compression format, designed for SNES roms, but it actually can be good with other stuff, like GBA roms, and probably anything 7z is good with.

kieran_ · Post by **kieran_** » Wed Jan 26, 2005 4:12 pm

grinvader wrote: and probably anything 7z is good with.

Why is this?

Post by **grinvader** » Wed Jan 26, 2005 4:15 pm

kilivipin wrote:
grinvader wrote: and probably anything 7z is good with.
Why is this?

7z and JMA are based on the same algorithm. So if 7z is effective on a certain format, JMA will probably do well on that format too.

kieran_ · Post by **kieran_** » Wed Jan 26, 2005 4:34 pm

grinvader wrote:
kilivipin wrote:
grinvader wrote: and probably anything 7z is good with.
Why is this?
7z and JMA are based on the same algorithm. So if 7z is effective on a certain format, JMA will probably do well on that format too.

How come the 7zip creators are not credited?

Post by **grinvader** » Wed Jan 26, 2005 4:35 pm

"How come the guys who wrote printf are not credited ?"

Edit : all the due credit is given. You just have to READ it, f00

kieran_ · Post by **kieran_** » Wed Jan 26, 2005 4:40 pm

grinvader wrote:"How come the guys who wrote printf are not credited ?"

What are you saying?
Did the 7zip creators just mod the zip format or something?
And... What's with the sarcasm, and the arrogance?

Post by **Nach** » Wed Jan 26, 2005 4:42 pm

kilivipin wrote:
grinvader wrote:
kilivipin wrote:
grinvader wrote: and probably anything 7z is good with.
Why is this?
7z and JMA are based on the same algorithm. So if 7z is effective on a certain format, JMA will probably do well on that format too.
How come the 7zip creators are not credited?

They are.

Any files made by them has their info at the top, and in addition:
http://nsrt.edgeemu.com/forum/viewtopic.php?t=344

I would like to give thanks all around to the ZSNES team, Snes9x team, 7-Zip team, AdvanceMame team, and our own staff for making JMA - the ultimate compression available for SNES ROMs a possibility.

- JMA compression support
(Nach, Lord Nightmare, Igor Pavlov, Andrea Mazzoleni, grinvader, CL, malcster, zones)

kieran_ · Post by **kieran_** » Wed Jan 26, 2005 4:43 pm

Nach wrote:
kilivipin wrote:
grinvader wrote:
kilivipin wrote:
grinvader wrote: and probably anything 7z is good with.
Why is this?
7z and JMA are based on the same algorithm. So if 7z is effective on a certain format, JMA will probably do well on that format too.
How come the 7zip creators are not credited?
They are.

Any files made by them has their info at the top, and in addition:
http://nsrt.edgeemu.com/forum/viewtopic.php?t=344
I would like to give thanks all around to the ZSNES team, Snes9x team, 7-Zip team, AdvanceMame team, and our own staff for making JMA - the ultimate compression available for SNES ROMs a possibility.

- JMA compression support
(Nach, Lord Nightmare, Igor Pavlov, Andrea Mazzoleni, grinvader, CL, malcster, zones)

Oh.. Thanks.
I just didn't see any credits in the nsrt 3.3 binary.

Post by **grinvader** » Wed Jan 26, 2005 4:43 pm

kilivipin wrote:And... What's with the sarcasm, and the arrogance?

I'm only reflecting the lack of trust you are so willing to demonstrate.

You've asked 4 questions answered by the SAME sentence, and doubt people about stuff you didn't even check. And you expect sarcasmless nice replies ?
Go you.

Post by **Nach** » Wed Jan 26, 2005 4:48 pm

kilivipin wrote: Oh.. Thanks.
I just didn't see any credits in the nsrt 3.3 binary.

Read the readme next time.

Post by **Nach** » Wed Jan 26, 2005 4:50 pm

Okay, got SNEeSe to load JMA files. I sent the changes to TRAC, hopefully you'll see it in the next version of SNEeSe.