Expose TIFF header start and position of Makernote tag

[phhoehne]

Background
I'd like to code an extension to decode the makernotes (starting with Nikon, later Canon, Sony & Fuji where possible).
Such implementations exist in Perl and Java but - as far as I know - not for Javascript.
Makernotes (at least for Nikon, haven't checked other brands yet) have again an IFD which references the actual values.
Issue is that the Makernotes IFD entries reference an offset relative to the start of the TIFF header. So I need this and the actual start of the makernote tag to calculate the correct offset within the makernotes section.

Request
Expose the offset / start of the TIFF header and the makernotes tag

[jdcoldsmith]

I second that this would be really nice to have!

[rcauquil]

@phhoehne have you been able to decode the makernotes ? I'm looking for a js solution for at least fuji for now.
Have a great day

[phhoehne]

@rcauquil

Haven't tried yet. I'd look at the ExifTool sources (perl) as a starting point.