Re: jpeg codec help with libjpeg6-b

giobeniamino wrote:
Hi,

My name is Giorgio, i'm student ( Electrical and Conputer Science
Engineer) and new on the DSP. For my final test i've to implement a
JPEG real-time decoder on BF-533 EZKIT-lite. On Google's Group i've
read that some of you used the lib of IJG (libjpeg6-b) for coding the
jpeg format.
I would like to use the same library instead of the analog SDK ( the
jpeg6-b is open source with full code access and with good
documentation), so I'm trying to optmize part of the code of the
library ( decompress only) but i don't know where to start.
Have any one any suggest to how i can optimize the code in order to do
real-time decoding application ?

I don't know anything about Analog's SDK, but if their C compiler is
reasonably good, you should be able to port that library relatively
easily. As for where to start, look in the documentation (or failing
that, in a sample program or utility) that comes with the library that
describes/shows you how to use it. You probably only need to know about
a few select functions in order to use the library, and one of them is
probably named something like jpeg_decode(). Locate that function, and
then start porting all the other code that it needs to operate. You may
want to strip out unecessary features (arithmetic coding, progressive
coding, etc.) to meet your project's requirements and/or your chips
memory limitations.

If you have more specific questions, feel free to ask.

Cheers! --M

.

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