Does anyone know of any good links on the specs.. of a jpeg file -decoding it..
I have been looking for it and am getting a lot of differnet info..

If anyone here that has been down this road and has any info on this like docs/sites.. ?

Thanks in advance!

One here: http://sourceforge.net/projects/jpegdec/

http://www.jpeg.org/jpeg/index.html
http://www.jpeg.org/public/jfif.pdf
do you know google?

If it's for the FBrowser project, i already have a bmp, gif, and jpeg decoder coded .

do you know what google do with your datas?

each time you google, big brother is watchin you.

now, google=big brother.

And he's watching you and you alone! He's sitting right outside your door, right now, because YOU have something he wants. It is YOU and only you that he needs. And he's going to get it from you. And your little dog, too.

<3 obsessive compulsive paranoia.

i don't have pets.

http://www.news.com/FAQ-Protecting-yourself-from-search-engines/2100-1025_3-6103486.html
http://www.guardian.co.uk/technology/2006/sep/07/askjack.guardianweeklytechnologysection
http://www.guardian.co.uk/technology/2006/aug/17/guardianweeklytechnologysection.google
http://www.privacyrights.org/ar/Ixquick.htm

is it paranoïa? or reality?

lol -To the above google ref....s


I was not asking for people to search google for me.. just asking if anyone here had some docs..on this or a good website.. Sometimes if you ask.. Someone may have just programmed one and share sites they used/docs..

If I find any thing worth reading I hang on to it!
There is a lot of junk out there to sort through!




But yes I was going to try and decode a jpeg.. later on.. and i wanted to begin reading on it..and in the future I want to try to decode mpeg..
I read has simular compresion.

Thanks again!

Look at Octavio's OctaOS for JPEG decoding srcs (and there's also a small 320x200-only DOS version he wrote, but you'll have to PM him or me for it, it's no longer attached on this forum).

EDIT: Well, it's small enough (the DOS version), so I may as well just attach it here (assuming Tomasz and Octavio don't mind, heh).

Thanks,
I will take a look..

*2

project is running.........yeah!!!

edfed:
I have been working on finding out why the irq1 was having problems with the keyboard code you added.. I added a little to the rest of the ints.. and fixed that fault from happening.. but the int you coded is not working.. not sure why seams to be getting stuck? or something? not sure what it is...
and then again I could be over looking something...

But like I said.. I don't think this is needed just yet.. or the IDT.. really I just wanted to try something different..try with it with the vesa text in the ints..

I am going to keep working on a parser/driver for the project.. but for right now I am done with the keyboard for now - later I may try some of my keyboard code... to double check it..

jpeg.com is here:
http://www.programmersheaven.com/zone10/cat453/index.htm
but this program has a bug (some colors are not correct),the bug is corrected in the menuetos version of the program.
To write this program i used documents found at
http://www.wotsit.org/
and also looked at sources of some jpeg programs written in C.

dosin:
i think the main problem is in the interrupt handler, as it send me an invalid opcode if i replace

by a

that's why vesaconstant.inc is directlly in the sequential source.


about farpointers & fasm...


octavio:
jpg source code is like soup.... .
i am litterally impressed by the lengh of the source needed to decode jpg...
i prefer bmp.

But there's a big difference between 64k for jpeg and 900k or so for a 640x480 24bpp bmp . It took me 3 months of work to code a jpeg decoder for DexOS, but it was well worthit.

Thats because is written in Fasm ,look at Octasm sources they are like
a cake

Dex wrote:
But there's a big difference between 64k for jpeg and 900k

what do you mean?

640*480 24bpp
bmp = 900 kbytes
jpg = 64 kbytes

I mean it may look alot of code (the jpeg decoder), but once its coded it save you alot of space, as jpegs are much small in size than bmp, so its worthit.

Yes, although there are various amounts of compression JPEG can use (even none, but I truly haven't seen such an example). Oh, and I'm sure you know that BMP can be compressed too (just not as well).

P.S. Just for more dopey useless information (for trivia buffs like me), you can indeed (re)compress JPEG images (as something else entirely, not transparently). See Matt Mahoney's PAQ8o8.