JXL: Initial support by cjee21 · Pull Request #2463 · MediaArea/MediaInfoLib

cjee21 · 2025-10-30T13:35:21Z

No description provided.

JeromeMartinez · 2025-10-30T13:37:28Z

    if (FromHeif) {
        int32u Size;
-        Get_B4 (Size,                                           "Exif header length");
+        Get_B4 (Size,                                           "Tiff header offset");


does not seem coherent.

Found ISO/IEC 23008-12...

That part was previously added in 8a2c57c then was modified by me to parse more files that have zero offset. Looks like that identifier is not part of specs? Maybe some other files may have offset other than 0 or 6?

Great to have a source, let's go with that.
The specs seems to tolerate something else that Exif\0\0, no strong preference but I would keep the check on the value until we find any other value. too strict?

cjee21 · 2025-10-30T14:36:15Z

Writing application                      : Ricoh Adobe Photoshop Camera Raw 16.0
Writing operating system                 : Apple macOS
Writing hardware                         : Ricoh Pentax 645Z

Application name has Ricoh wrongly added.

0000A6  Manufacturer of image input equipment - RICOH IMAGING COMPANY, LTD. (28 bytes)
0000A6   Data:                                 RICOH IMAGING COMPANY, LTD.
0000C2  Model of image input equipment - PENTAX 645Z (12 bytes)
0000C2   Data:                                 PENTAX 645Z
0000CE  Software used - Adobe Photoshop Camera Raw 16.0 (Macintosh) (44 bytes)
0000CE   Data:                                 Adobe Photoshop Camera Raw 16.0 (Macintosh)

JeromeMartinez · 2025-10-30T14:39:00Z

Application name has Ricoh wrongly added.

Argh, everyone does as it wants, not easy to have a good rule...
sample file? (I could forge one but better if I have a real one)

cjee21 · 2025-10-30T14:41:12Z

sample file?

I simply picked one from the link posted in JPEG XL issue -> https://people.csail.mit.edu/ericchan/hdr/jxl_images/20140606_102418_IMGP0297.jxl

cjee21 · 2025-10-30T14:46:53Z

The XML is brotli compressed in this one.

cjee21 · 2025-10-30T19:02:32Z

@JeromeMartinez I am not sure what you plan to do with the Brotli compressed data in JXL. I just did a quick implementation for MSVC only just for testing to see what's in there.

JeromeMartinez · 2025-10-30T19:31:24Z

I am not sure what you plan to do with the Brotli compressed data in JXL

I am very interested, but I would like something similar to zlib, with using system libs on Linux and (patched, with specific build projects if needed) on Win & Mac.
I added https://github.com/MediaArea/brotli , in case you are motivated enough (please :) ) for implementing something similar to zlib.

cjee21 · 2025-10-31T10:54:40Z

@JeromeMartinez I think I got MSVC project done. Cannot figure out CMake and no idea about MacOS or Linux makefiles.

JeromeMartinez · 2025-10-31T10:56:14Z

@cjee21 thank you for your work. We'll try on our side to manage the other makefiles.
(but no ETA :( )

cjee21 · 2025-10-31T12:48:15Z

Not sure if I have done it the right way but CMake also works now.

JeromeMartinez · 2025-10-31T13:07:59Z

Not sure if I have done it the right way but CMake also works now.

thank you!

cjee21 · 2026-02-13T09:29:42Z

Not sure if the Configure and CMake is done properly or the right way (the CMake looks non-ideal due to brotli upstream CMake seems to be missing something) but it does work in the CI including in MediaInfo CLI/GUI CI.

If this is fine then we can merge brotli PR first then edit this PR (since it is now using my branch for testing) then repeat for MediaInfo CLI/GUI PR.

cjee21 · 2026-02-13T09:33:09Z

and #2463 (comment) is not fixed yet

cjee21 · 2026-02-14T09:36:51Z

@JeromeMartinez Trace offset is strange in little endian bitstream?

0002A  SizeHeader (4 bytes)
AD0D0   div8:                                 No - (2 bits)

UPDATE: Fixed. Hope I did not break anything or cause regressions.

cjee21 · 2026-02-15T09:00:47Z

No idea how to organize properly the JPEG XL Parser structure and also how to concat the jxlp boxes.

Anyway, the current state of output:

General
Complete name                            : 20140606_102418_IMGP0297.jxl
Format                                   : JPEG XL
Codec ID                                 : jxl  (jxl )
File size                                : 1.37 MiB
Producer                                 : Eric Chan
Subject                                  : 2014-06-01-Adobe-Redwoods / Backlit / Damnation Creek Trail / Del Norte Coast Redwoods State Park / HDR Test Photo / Instagram / Intimate Landscape / Landscape / Plant / Redwood Area / Sunstar / Tree-Shrub-Leaves
Recorded date                            : 2014-06-06 10:24:18
Encoded date                             : 2022-07-14 09:34:22-04:00
Mastered date                            : 2014-06-06 10:24:18
Writing application                      : Ricoh Adobe Photoshop Camera Raw 16.0
Writing operating system                 : Apple macOS
Writing hardware                         : Ricoh Pentax 645Z
Copyright                                : Copyright 2014 by Eric Chan
ShutterSpeed_Time                        : 1.3 s
IrisFNumber                              : 22.0
AutoExposureMode                         : Aperture-priority AE
ISOSensitivity                           : 100
ExposureBiasValue                        : 0.0
Flash                                    : Off, Did not fire
LensZoomActualFocalLength                : 55.00 mm
AutoWhiteBalanceMode                     : Manual
LensZoom35mmStillCameraEquivalent        : 43 mm
LensModel                                : smc PENTAX-D FA645 55mm F2.8 AL [IF] SDM AW
DigitalSourceType                        : Digital capture sampled from real life

Image
Format                                   : JPEG XL
Width                                    : 1 638 pixels
Height                                   : 2 048 pixels
Color space                              : XYB
Bit depth                                : 16 bits

General
Complete name                            : lossless_JPEG_reconstruction.jxl
Format                                   : JPEG XL
Codec ID                                 : jxl  (jxl )
File size                                : 2.12 MiB

Image
Format                                   : JPEG XL
Format settings                          : Lossless JPEG Reconstruction
Width                                    : 2 048 pixels
Height                                   : 1 365 pixels
Color space                              : RGB
Bit depth                                : 8 bits

General
Complete name                            : raw_codestream.jxl
Format                                   : JPEG XL
File size                                : 2.12 MiB

Image
Format                                   : JPEG XL
Width                                    : 2 048 pixels
Height                                   : 1 365 pixels
Color space                              : RGB
Bit depth                                : 8 bits

JeromeMartinez reviewed Oct 30, 2025

View reviewed changes

cjee21 force-pushed the jxl branch 2 times, most recently from 666aa16 to 66e0f78 Compare October 30, 2025 14:13

cjee21 force-pushed the jxl branch from 66e0f78 to d559032 Compare October 30, 2025 14:46

cjee21 force-pushed the jxl branch 4 times, most recently from 1b43ba9 to 0af26ec Compare October 30, 2025 18:56

cjee21 force-pushed the jxl branch 6 times, most recently from c3cf290 to feb2fcb Compare October 31, 2025 10:35

cjee21 force-pushed the jxl branch 4 times, most recently from 443950a to bacc8d5 Compare October 31, 2025 12:40

cjee21 force-pushed the jxl branch from bacc8d5 to 29a4260 Compare November 6, 2025 11:39

cjee21 force-pushed the jxl branch from 29a4260 to fd08cd3 Compare November 30, 2025 14:59

cjee21 force-pushed the jxl branch from fa34d28 to 291ae17 Compare November 30, 2025 17:46

cjee21 force-pushed the jxl branch 5 times, most recently from 141cda8 to de97b00 Compare February 13, 2026 08:52

cjee21 force-pushed the jxl branch from dd061b8 to ed31e80 Compare February 14, 2026 09:34

cjee21 force-pushed the jxl branch 3 times, most recently from a686d6f to 43d7928 Compare February 15, 2026 08:59

cjee21 force-pushed the jxl branch 3 times, most recently from 32637a3 to 48dfa76 Compare February 15, 2026 15:27

cjee21 changed the title ~~JXL: Parse Exif and XMP~~ JXL: Initial support Feb 15, 2026

cjee21 force-pushed the jxl branch 3 times, most recently from 9e041cf to 79cc9cc Compare February 16, 2026 11:37

cjee21 force-pushed the jxl branch 3 times, most recently from cbfee7e to 936b4a3 Compare March 10, 2026 19:15

cjee21 added 5 commits March 11, 2026 20:45

JXL: Parse Exif and XMP

12ee15f

Parse Brotli-compressed data

de38219

Fix trace for LE bitstream

efe7b89

JXL: Parser for JPEG XL

28673ea

[TEST] CI build test

69d9301

cjee21 force-pushed the jxl branch from 936b4a3 to 69d9301 Compare March 11, 2026 12:47

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