OpenJPEG fails to decode partial j2c where kdu succeeds

[RyeMutt]

OpenJPEG fails to decode the attached partial j2c that kdu_show succesfully decodes and renders.

Tested against OpenJPEG master branch.

opj_decompress reports the following error:

Tile part length size inconsistent with stream length

testimg1.zip

[boxerab]

What is a partial j2c ?

[RyeMutt]

I didn't really know what else to call it, but the software we work with(SecondLife opensource clients) decodes j2c files while they're downloading so that potentially only a piece of the file is available while it's decoding until full download is complete. When OpenJpeg 2.x tries to decode the partially downloaded file it outputs a garbled black/rainbow colored image, but OpenJpeg 1.5.0 works fine.

[duhaime]

@CmdrCupcake I'm working with a team that's trying to convert/restore some partial jp2s, and I'm wondering if the library you're using might be able to aid us in our quest (openjpeg fails to convert the images). Do you have a link to the source you're using to decode partial j2c files?

[RyeMutt]

The last version of openjpeg that could decode incomplete j2c streams was 1.5.0 in our usage(partially downloaded texture data for OpenSim/SecondLife protocol clients and servers). I believe the commercial kakadu library is also capable of this.

[duhaime]

Ah, thanks so much @CmdrCupcake! I don't think we're going to spring for the Kakadu license but I'm going to check out openjpeg@1.5.0. Thanks again for following up!

[jarrelscy]

2 years late.... but if you still care:
https://github.com/jarrelscy/openjpeg

I made some changes to the 2.3.1 repo that enable partial decoding.

[chafey]

I also implemented this here: #1251, not sure how it compares to @jarrelscy version

[Neopallium]

I updated @chafey PR. #1407