[Libexif-devel] libmnote canon support

[matthieu <ma...@if...>]

hello,
i am trying to add support for my canon (G3) in libmnote.
But i have find some small problem :
the maker note data start directly with the data, and the pr=
obing that
was made in mnote_data_new_from_data ("(size > 1) && (data[0=
] =3D=3D 0x00)
&& (data[1] =3D=3D 0x00)") doesn't work, and i have to force=
 canon maker
note for it works. Why not use the exif tag 0x010f for doing=
 this
probing ?

Also i have another problem with the endianess : libmnote do=
esn't seem
to detect the order and mnote_data_get_byte_order return alw=
ays 0
whereas my data are intel type. So i have to set this flag i=
n
libmnote-canon...

another thing is in specific camera code there is generic co=
de that is
only copy and paste and only few code have to be modified fo=
r it work :=20
the begining of mnote_*_data_load_data, the value in offset =
of
mnote_*_data_load_data_entry (yes i don't know why but i nee=
d to do doff
=3D exif_get_long (d + offset + 8, order)-0x3B0; for having =
the correct
offset) and the value of tag, and their description (
mnote_*_entry_get_value, _MNote*Tag, ...)

Also the canon maker note use sort of subtag(45 entry in tag=
 0x1... but
only 15 are know), and get_value have to return big chain of=
 settings...

here an example of what i have done :

Dumping MakerNote content (14 entries)...
Tag: 0x1 ('Settings1')
  Value: Macro mode : Normal
Flash mode : auto + red eyes reduction
Continuous drive mode : single or timer
Focus mode : Single
ISO : auto
Exposure mode : Easy shooting
long focal length of lens (in focal units) : 922
short focal length of lens (in focal units) : 230
focal units per mm : 32
Focus mode : Single
Tag: 0x4 ('Settings2')
  Value:=20
Subject Distance (mm) : 158
Tag: 0x6 ('ImageType')
  Value: IMG:PowerShot G3 JPEG
Tag: 0x7 ('FirmwareVersion')
  Value: Firmware Version 1.02
Tag: 0x8 ('ImageNumber')
  Value: 107-0710
Tag: 0x9 ('OwnerName')
  Value: Matthieu

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