Re: [Libexif-devel] MakerNote support

[Rod W. <lis...@rw...>]

On Fri, 2002-11-08 at 09:04, Lutz M=FCller wrote:
> You can always
> set up new objects like exif-mn-[entry,content,tag] (mn =3D MakerNote)
> inheriting from the exif-equivalents.
> (Me looking at the source...)
> I think I have already done something like that in
> libexif/libexif/olympus. Could you give me your opinion on that?

I've used what you've provided in libexif/libexif/olympus, and made the
following changes:

1/ Added a "note" field to ExifData to store an ExifNote (looks like an
ExifContent), which is a set of ExifNoteEntry (looks like an ExifEntry). =
The
new data structures are in exif-note.c and in the maker-specific
directories.

2/ Added code to exif_data_load_data_entry and exif_data_save_data_entry =
to
load and save the MakerNote entry to and from the "note" field in ExifDat=
a.
Added code to allow dumping of the makernote (so a test-tree run will dum=
p
out the individual makernote entries).

3/ Added lots of new methods in ExifNote to handle accessing individual
ExifNoteEntry entries.

My big question going forward is to do with the exif/exif/main.c file and
how these new individually named things (ExifNoteEntry, accessed via the
ExifNoteTag) should be identified by the user.  The options are the re-us=
e
the -tag switch, and just have a new -ifd option for the MakerNote (but I
know that you're not keen on this option), or to add a new set of switche=
s
(-note, -list_notes) for handling MakerNote entries separately.

Let me know if you'd like to see the code (either a tarball or diffs).

-- Rod Whitby