I shouldn't admit, but I'm not a programmer. As a programming hobbyist, I wanted to run the libraw library from DNG SDK and GPR SDK. The creator of libraw added camera Rapsberry Pi RAW+JPEG format (if USE_6BY9RPI defined) 8/12/14/16bit.

#ifdef USE_6BY9RPI
	void		rpi_load_raw8();
	void		rpi_load_raw12();
	void		rpi_load_raw14();
	void		rpi_load_raw16();
	void		parse_raspberrypi();
#endif

I also added GoPro GPR bayerphase 8/12/14/16bit. I realize that it isn't connected.
https://github.com/gopro/gpr/tree/bayerphase
The new jpegXL codec 8/10/12/16bit is very much advertised.
What is the libraw problem. The converter has bad colormatrix for DNG SDK, but dng_validate seems to be valid.
Fix: Adobe XMP SDK 2020
https://github.com/adobe/XMP-Toolkit-SDK/
adobe/XMP-Toolkit-SDK#2
adobe/XMP-Toolkit-SDK#3
…
Other info Warming. This may be due to the imperfections of the gcc 10/11 software.

In file included from dng_negative.h:28,
                 from dng_negative.cpp:9:
In member function 'dng_mosaic_info& dng_mosaic_info::operator=(const dng_mosaic_info&)',
    inlined from 'void dng_negative::SetFujiMosaic6x6(uint32)' at dng_negative.cpp:2884:10:
dng_mosaic_info.h:32:7: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
   32 | class dng_mosaic_info
      |       ^~~~~~~~~~~~~~~

dng_string.cpp: In member function 'bool dng_string::Replace(const char*, const char*, bool)':
dng_string.cpp:1608:12: warning: 'char* strncpy(char*, const char*, size_t)' specified bound depends on the length of the source argument [-Wstringop-overflow=]
 1608 |    strncpy (fData.Buffer_char () + match_offset,
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1609 |       new_string,
      |       ~~~~~~~~~~~
 1610 |       len3);
      |       ~~~~~
dng_string.cpp:44:18: note: length computed here
   44 |  ConvertUnsigned (strlen (s), &lengthAsUint32);
      |  ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PNG_Support.cpp:89:16: warning: multi-character character constant [-Wmultichar]
   89 |         IHDR = 'IHDR',
      |                ^~~~~~

XMPScanner.cpp: In member function 'void XMPScanner::Scan(const void*, XMP_Int64, XMP_Int64)':
XMPScanner.cpp:1267:5: warning: 'template<class> class std::auto_ptr' is deprecated [-Wdeprecated-declarations]
 1267 |     auto_ptr<PacketMachine> ap ( pm );
      |     ^~~~~~~~
In file included from c:\msys1100\include\c++\11.0.0\memory:83,
                 from c:\msys1100\x86_64-w64-mingw32\include\xmpfiles\source\formatsupport\xmpscanner.hpp:22,
                 from XMPScanner.cpp:27:
c:\msys1100\include\c++\11.0.0\bits\unique_ptr.h:56:28: note: declared here
   56 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~

Fix: added new dng sdk 1.5.x #30

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