This code is based on cedrus PoC Jpeg HW decoding
It has been extended by some additional functiionality to use it as a library 
(mainly for Kodi), but of course can be used for other programs as well
The main concept behind the library is to provide the decoded data either
as an RGB single combined plane in an continous memory block provided
by the user of the library or provide the image as an EGL image for the
Mali binary EGL library implementation from ARM (r3p1)

Requirements: This implementation requires the library libcedar_access, which 
encapsulates and controls the access to the cedar device, while this library concentrates
to decode the jpeg header, extract the required data and program the cedar
HW registers appropriately.


The following is the original comment provided by cedrus. It is no longer valid,
e.g. it does not output an .ppm image anymore

Proof of Concept JPEG decoder using Allwinners CedarX
=====================================================

*WARNING*: Don't use on "production systems". This was made by reverse
engineering and might crash your system or destroy data!
It was made only for my personal use of testing the reverse engineered
things, so don't expect good code quality. It's far from complete and
might crash if the JPEG doesn't fit it's requirements!

Usage:
------

make
./jpeg-test example.jpg

If everything works, output is .ppm (Portable Pixmap).
You might pipe it into ImageMagick:

./jpeg-test example.jpg | display -