Accessing tags database in Harmattan - maemo.org

jaywink | # 1 | 2012-01-30, 19:36 | Report

Hi all,

I have a little sharing app in development for the N9 Harmattan. I'd like to add hashtag support (twitter, diaspora, etc) and would like to enable the user to choose from the same tags as the Gallery. I would need to not only read the tags, but save new tags as well.

Any pointers to code relating to the tag chooser in the Nokia N9 Gallery app? Or at least what API could be used to access the tags?

Looked around various places for hours and cannot find anything

Thanks!

Br,
Jason

quipper8 | # 2 | 2012-01-31, 16:45 | Report

the tags are stored in the image itself

See xmp standard
http://ns.adobe.com/xap/1.0/

what you are looking for is stored in

dc:subject

tracker might also keep a list of tag data for photos, idk, would make things like filter by tag easier

here is the data in a photo I tagged using N9 with 'food' and 'tedt'

Code:

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Exempi + XMP Core 4.4.0">
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about=""
    xmlns:exif="http://ns.adobe.com/exif/1.0/"
    xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:xmp="http://ns.adobe.com/xap/1.0/"
   exif:NativeDigest="36864,40960,40961,37121,37122,40962,40963,37510,40964,36867,36868,33434,33437,34850,34852,34855,34856,37377,37378,37379,37380,37381,37382,37383,37384,37385,37386,37396,41483,41484,41486,41487,41488,41492,41493,41495,41728,41729,41730,41985,41986,41987,41988,41989,41990,41991,41992,41993,41994,41995,41996,42016,0,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,20,22,23,24,25,26,27,28,30;96064CBBB982FC9EF78639C495C194E3"
   exif:ExposureBiasValue="0/1"
   exif:DateTimeOriginal="2012-01-29T10:28:24.268000-04:58"
   exif:ExposureTime="31/1000"
   exif:FNumber="11/5"
   exif:ExposureProgram="0"
   exif:ShutterSpeedValue="467760638/93335813"
   exif:ApertureValue="122425887/53813410"
   exif:MeteringMode="1"
   exif:FocalLength="28/1"
   exif:ExposureMode="0"
   exif:WhiteBalance="0"
   exif:DigitalZoomRatio="1/1"
   exif:SceneCaptureType="0"
   exif:GainControl="3"
   exif:Contrast="0"
   exif:Saturation="0"
   exif:Sharpness="0"
   exif:ExifVersion="0230"
   exif:FlashpixVersion="0100"
   exif:FileSource="3"
   exif:Date="2012-01-29T15:28:24Z"
   exif:Title="20120129 001"
   exif:Orientation="top - left"
   tiff:NativeDigest="256,257,258,259,262,274,277,284,530,531,282,283,296,301,318,319,529,532,306,270,271,272,305,315,33432;006EF1F055196E10731219DB0CE0FC0C"
   tiff:Orientation="1"
   tiff:Make="Nokia"
   tiff:Model="N9"
   dc:format="image/jpeg"
   dc:date="2012-01-29T15:28:24Z"
   dc:title="20120129 001"
   dc:contributor="myname"
   dc:creator="myname"
   dc:subject="Food, Tedt"
   xmp:ModifyDate="2012-01-29T10:28:24"
   xmp:CreateDate="2012-01-29T10:28:24.268000-04:58">
   <exif:ISOSpeedRatings>
    <rdf:Seq>
     <rdf:li>151</rdf:li>
    </rdf:Seq>
   </exif:ISOSpeedRatings>
   <exif:Flash
    exif:Fired="True"
    exif:Return="0"
    exif:Mode="3"
    exif:Function="False"
    exif:RedEyeMode="False"/>
  </rdf:Description>
 </rdf:RDF>
</x:xmpmeta>

jaywink | # 3 | 2012-01-31, 19:04 | Report

Originally Posted by quipper8 View Post

the tags are stored in the image itself

See xmp standard
http://ns.adobe.com/xap/1.0/

what you are looking for is stored in

dc:subject

tracker might also keep a list of tag data for photos, idk, would make things like filter by tag easier

I'm quite sure there must be some sort of tag database since the same tags are always available even when not adding them to images. If I go to Share UI and choose to share my image to Picasa/Flickr for example, I can choose tags from a tag cloud that has all the tags I've previously added. So tags are stored somewhere centrally where the gallery and Share UI get to use them.

Tracker might be an answer but doesn't it just index files and file metadata?

But thanks anyway for your reply

nicolai | # 4 | 2012-01-31, 20:17 | Report

They are saved in the tracker database, even when they aren't used
in the image tags anymore.

tracker-sparql -q "select nao:prefLabel(?d) where { ?d a nao:Tag}"

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jaywink | # 5 | 2012-02-01, 20:23 | Report

Cool thanks nicolai, exactly what I was looking for! Need to look at how to use the QtSparql from my app.

jaywink | # 6 | 2012-02-03, 22:13 | Report

Any idea why this QML fails in QtCreator and device (N9 PR1.1)?

Originally Posted by

import QtSparql 1.0

http://harmattan-dev.nokia.com/docs/...del.html?tab=1

Got a hint to try 0.1, which works on device, but 'SparqlListModel' is not recognized.

Something related to PR1.2 which is in the docs already?

jaywink | # 7 | 2012-02-05, 21:18 | Report

Started working with Python-QtSparql.

Got access denied to tracker DB and set up Aegis permissions to read/write. However, query returns this error:

Originally Posted by

QTrackerDirectSyncResult: QSparqlError(9, "GDBus.Error

rg.freedesktop.DBus.Error.AccessDeni ed: Rejected send message, 2 matched rules; type="method_call", sender=":1.404" (uid=29999 pid=17355 comm="/usr/bin/python /opt/sharetus/sharetus.py http://w") interface="org.freedesktop.Tracker1.Steroids" member="Query" error name="(unset)" requested_reply=0 destination="org.freedesktop.Tracker1" (uid=29999 pid=1327 comm="/usr/lib/tracker/tracker-store "))", 4) "select nao

refLabel(?d) where { ?d a nao:Tag}"

I checked permissions for the PID and they seem ok:

Originally Posted by

~ $ accli -p 1327 -I
Credentials:
UID::user
GID::metadata-users
SRC::com.nokia.maemo
AID::com.nokia.maemo.tracker.
TrackerReadAccess
TrackerWriteAccess
tracker::tracker
tracker::tracker-extract-access
tracker::tracker-miner-fs-access

So it looks ok to me. Ideas, anyone?

radiofree | # 8 | 2012-02-06, 08:17 | Report

Originally Posted by jaywink View Post

Any idea why this QML fails in QtCreator and device (N9 PR1.1)?

http://harmattan-dev.nokia.com/docs/...del.html?tab=1

Got a hint to try 0.1, which works on device, but 'SparqlListModel' is not recognized.

Something related to PR1.2 which is in the docs already?

You need the PR1.2 SDK/Update to use the SparqlListModel, I assume it's in the documentation already because of the N950 update.

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radiofree | # 9 | 2012-02-06, 08:18 | Report

Originally Posted by jaywink View Post

So it looks ok to me. Ideas, anyone?

Does it work with GRP::metadata-users?

jaywink | # 10 | 2012-02-06, 20:02 | Report

Originally Posted by radiofree View Post

Does it work with GRP::metadata-users?

Actually it seems it was my mistake in looking at the wrong PID. But also it seems launching python via the command line and launching it via the Share UI get different permissions. The latter seems to work correctly.

See this post:
http://www.developer.nokia.com/Commu...l=1#post881097

But thanks anyway!