Re: [Libexif-devel] Need some help with adding support for extra canon makernotes

[Jef D. <jef...@ho...>]

Jef Driesen wrote:
> Many makernote tags are already documented by the 'exiftool' project 
> [1], but are not in the libexif library. I'm working on adding those 
> canon makernotes to the libexif library.
> 
> [1] http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Canon.html

I finished updating the libexif library with canon makernotes. I have 
created three patches (mnote-canon-tag.h, mnote-canon-tag.c and 
mnote-canon-entry.c) against the cvs version. How do I contribute this work?

An overview of the changes:

* Some tags were updated from exiftool:
    - MNOTE_CANON_TAG_SETTINGS_1
    - MNOTE_CANON_TAG_SETTINGS_2
I also intended to change there names to some more meaningful values, 
like used in exiftool (respectively CAMERA_SETTINGS and SHOT_INFO), but 
I'm not sure if that will break existing applications. The only tag I 
did not update is the lenstype.

* Some new tags were added from exiftool:
    - MNOTE_CANON_TAG_FOCAL_LENGTH
    - MNOTE_CANON_TAG_PANORAMA

* All other tags (documented or not by exiftool) do not contain very 
useful information (for the only camera I own), and were not added. 
Maybe later, who knows...

* Added some internal functions to convert apex values to 
aperture/shutterspeed/iso values. Also moved the code for the table 
lookups to separate functions.

* Added a "Manual flash output" tag (actually there are two), obtained 
by reverse engineering. It works for my camera, but I don't know for others!

For some tags, exiftool lists exceptions for specific type of camera's. 
I did not incorporate that information, because I don't have those 
camera's to test. I checked everything very carefully, but there could 
still be some mistakes...