[Digikam-devel] better metadata support : added exiv2 depency ?

[fj.cruz at supercable.es]

---- Thorsten Schnebeck <thorsten.schnebeck at gmx.net> escribió: 
> Am Dienstag 14 Februar 2006 20:50 schrieb Caulier Gilles:
> > Le Mardi 14 Février 2006 20:34, Dennis Gnad a écrit :
> > > > - RAW Exif/IPTC extraction
> > >
> > > Probably you already heard of it. Exiftool
> > > (http://www.sno.phy.queensu.ca/~phil/exiftool/) seems very
> > > good and handles quite much (at least it handles the exif of
> > > my nikon D70 raw files, and on the site there are many many
> > > others listed, have a look at it!). The only problem could be
> > > that it is written in perl.
> >
> > Yes i know it. The Exiftool tags doc is excelent, but i don't
> > understand why this tool hasn't been written in C/C++ for any
> > performance reasons.
> 
> (ok, another try ;-) )
> 
> simple question, simple answer:
> ****
> e4l: How come you started writing ExifTool?
> 
> PH: It evolved from a few routines I wrote for an image 
> cataloguing utility 
> (http://owl.phy.queensu.ca/~phil/icat/) that I wrote initially to 
> maintain the images in the SNO web site in 2001.  That was my 
> introduction to Perl -- before that I was mainly a C++ programmer.  
> Since then, I have done some rather substantial projects in Perl, 
> and have really come to enjoy programming in this language.  Now 
> I find it hard to live without the automatic memory handling, 
> hash lookups, and regular expressions.
> 
> e4l: ExifTool is a Perl library with a comand line tool as 
> backend. On your homepage you write that this helps to envolve 
> ExifTool that fast. Now, with 5.00 ready, can you imagine to port 
> this to a c/c++-lib?
> 
> PH: When I decided to add the writing features to ExifTool last 
> December, I considered rewriting the project in C++ since the 
> work required to add the writing abilities would be many times 
> the effort of writing the original utility.  But even if I 
> ignored the cost of rewriting the existing code, it would have 
> been twice the work to do this project in C++, so I decided to 
> use Perl.
> ****
> > We cannot using Exifttol in digiKam. We using C++...
> 
> Too bad that there are no scripting hooks so tasks like metatag 
> handling can be temporary handled by 1st class scripts as long as 
> the C/C++ libs are still so limited.
> 
> I would also start writing a wrapper C++-class for exiftool in any 
> way you like as I do not see a performance problem. In digiKam 
> current metatag handling only works on one single photo. So with 
> a little bit smart code handling fast pic-to-pic clicks in album 
> view every script ist fast enough for reading and writing a 
> single file. Slower handling is better than no handling. ;-)
> 
> Bye
> 
>   Thorsten
> 
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Well, I agree exiftool is a very good way to get metadata from images, if there is not speed issue and you want/can write a wrapper, I think it could be a good idea.

Paco