Metadata sync with android app: where to start

[klaus3b]

I am the developer of the android app APhotoManager
https://github.com/k3b/APhotoManager/
and i would like to have some metadata sync mechanism between
my android app and digikam. 

since i have no experience in c++/kde programming i donot know where to
start to make it as easy as possible for the digikam side. 

My current situation:

* On Pc (win64) i have 17000 taged high-res photos in different
(sub-)folders
* On Android i have the same photos but with low resolution (1024*x or
x*1024)

While viewing the low res photos on android i sometime update the keywords
and gps-infos and rename/move/copy/delete jpg/xmp-files. This info should be
send back from android to the pc-photos.

On pc side i update keywords, gps, title, description, filepath which should
be synced to android.

Currently i have a metadata sync procedure (
https://github.com/k3b/APhotoManager/wiki/sync ) that uses exiftools on the
pc side:

* pc to android: use exiftool to generate csv file with meta data that
android app can read
* android to pc: android generates mswindows batchfile with all meta data
changes that is executed on pc.

Is there already a datafileformat that digikam can read/write that i can
also implement?

I am willing to implement the android side. Is there somebody who can
implement the-digikam/plugin side

Note this issue is not about copying jpg/xmp files but applying
keywords/gps/title/descrtiption/filepath on the other side, too



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