0002255: Making libdcp compatible with openjpeg 2.5 - MantisBT

ID	Project	Category	View Status	Date Submitted	Last Update

0002255	libdcp	Packaging	public	2022-05-19 13:19	2022-12-06 21:21

Reporter	bradel	Assigned To	carl
Priority	normal	Severity	minor	Reproducibility	always
Status	resolved	Resolution	fixed
Platform	64-bit	OS	Linux	OS Version	Arch

Summary	0002255: Making libdcp compatible with openjpeg 2.5
Description	Dear Carl, I am working together with Markus to provide DCPoMatic 2.16 to Arch Linux Users. As far as I understand you patched libopenjp2 to provide the Guard Bits required by SMPTE standard for 2k DCPs. However, since version 2.5 of openjpeg, upstream has introduced an option to specify the number of guard bits with a slightly different syntax. Therefore, I wrote the attached patch which makes libdcp compatible with the upstream version of openjpeg 2.5, which is also the current version in Arch Linux. I would like to ask you if you think we can proceed with patching libdcp to work with the native libopenjp2 or is there something else we are missing? Thank you very much for your work on DCPoMatic! (Sorry for reporting this as minor issue, but I did not find an adequate category for this "bug") Best regards, Benjamin
Tags	No tags attached.
Attached Files	0001-fix-compile-with-openjp25.patch (853 bytes) --- a/src/j2k_transcode.cc 2022-05-17 10:07:44.525679224 +0200 +++ b/src/j2k_transcode.cc 2022-05-17 10:04:18.846330309 +0200 @@ -46,7 +46,7 @@ #include <openjpeg.h> #include <cmath> #include <iostream> - +#include <string> using std::min; using std::pow; @@ -315,10 +315,13 @@ parameters.max_comp_size = parameters.max_cs_size / 1.25; parameters.tcp_numlayers = 1; parameters.tcp_mct = 1; - parameters.numgbits = fourk ? 2 : 1; + string numgbits = "GUARD_BITS="; + numgbits.append(std::to_string(fourk ? 2 : 1)); + const char* extraopt[] { numgbits.data(), nullptr }; /* Setup the encoder parameters using the current image and user parameters */ opj_setup_encoder (encoder, &parameters, xyz->opj_image()); + opj_encoder_set_extra_options(encoder, extraopt); auto stream = opj_stream_default_create (OPJ_FALSE); if (!stream) { 0001-fix-compile-with-openjp25.patch (853 bytes)

carl 2022-05-19 16:09 administrator ~0005031	Thanks, I will take a look.

carl 2022-12-06 21:21 administrator ~0005356	Sorry for the delay in getting to this. I merged a change like yours to libdcp v1.8.37, so it should now build with libopenjpeg 2.5. The last time I checked, the optimisations in the DCP-o-matic "bundled" version of openjpeg were slightly more effective (at least in the DCP case) than those in openjpeg 2.5, so the bundled version may be a little faster. I need to check this properly though. I don't know of any other problems with the 2.5 release. Thanks for all the work you do making DCP-o-matic work on Arch, and let me know if there's anything I can to do help!

Date Modified	Username	Field	Change
2022-05-19 13:19	bradel	New Issue
2022-05-19 13:19	bradel	File Added: 0001-fix-compile-with-openjp25.patch
2022-05-19 16:09	carl	Assigned To	=> carl
2022-05-19 16:09	carl	Status	new => acknowledged
2022-05-19 16:09	carl	Note Added: 0005031
2022-12-06 21:21	carl	Note Added: 0005356
2022-12-06 21:21	carl	Status	acknowledged => resolved
2022-12-06 21:21	carl	Resolution	open => fixed