Wrong definition for records in CTMD box

[DrCQ]

In your description, each record entry located in the CTMD box has two long values for Record Type (starting at offset 0) and Record Size (starting at 4). For most of the old cameras it is the right assumption, but I found a lot of new cameras (like EOR R3, EOS-1DXmkIII, EOS-R10, EOS-R50, EOS-R6M2, EOS-R7 and EOS-R8) using a different format. For record numbers 7, 8 and 9 these cameras writes [01 01 00 07] instead of [00 00 00 07] etc. For this reason, I suggest to adopt the format definition and split the first value of long into two values of short, where the Record Type is taken from the second value. The first value will be 'unknown' for me.

I'm not using your software but the great CR3 format specification only, and I'm working on my own implementation. If you have any questions or comments, please let me known.

Regards, Christoph

[lclevy]

Could you please offer a patch or delta for the spec ?

[DrCQ]

Here you are (as replacement inside the CTMD box):

For each record (size=8 bytes):

Offset | type | size | content -- | -- | -- | -- 0 | short| 1 | unknown 2 | short| 1 |type. 1,3,4,5,7,8 or 9 4 | long | 1 | size

[lclevy]

fixed in https://github.com/lclevy/canon_cr3/commit/e2db91fc1df56afb887606fb68967ef9f2054408