[tracker/gst-geolocation: 1/2] tracker-extract: Add geolocation to GStreamer extractor

[Martyn James Russell <mr src gnome org>]

commit 05b1caa1b1e186bd9bfe0db828c058fe7122f993
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Jun 13 15:58:19 2011 +0200

    tracker-extract: Add geolocation to GStreamer extractor

 src/tracker-extract/tracker-extract-gstreamer.c |   82 +++++++++++++++++++++++
 1 files changed, 82 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-gstreamer.c b/src/tracker-extract/tracker-extract-gstreamer.c
index 219bd3e..f509f9a 100644
--- a/src/tracker-extract/tracker-extract-gstreamer.c
+++ b/src/tracker-extract/tracker-extract-gstreamer.c
@@ -406,6 +406,87 @@ get_embedded_album_art (MetadataExtractor *extractor)
 }
 
 static void
+add_geolocation_tags (TrackerSparqlBuilder *metadata,
+                      TrackerSparqlBuilder *preupdate,
+		      GstTagList           *tag_list)
+{
+	gchar *country, *city, *sublocation;
+	gdouble lat, lon, alt;
+	gboolean has_coords;
+
+	country = city = sublocation = NULL;
+	has_coords = (gst_tag_list_get_double (tag_list, GST_TAG_GEO_LOCATION_LATITUDE, &lat) &&
+		      gst_tag_list_get_double (tag_list, GST_TAG_GEO_LOCATION_LONGITUDE, &lon) &&
+		      gst_tag_list_get_double (tag_list, GST_TAG_GEO_LOCATION_ELEVATION, &alt));
+
+	gst_tag_list_get_string (tag_list, GST_TAG_GEO_LOCATION_CITY, &city);
+	gst_tag_list_get_string (tag_list, GST_TAG_GEO_LOCATION_COUNTRY, &country);
+	gst_tag_list_get_string (tag_list, GST_TAG_GEO_LOCATION_SUBLOCATION, &sublocation);
+
+	if (city || country || sublocation || has_coords) {
+		gchar *address_uri = NULL;
+
+		/* Create postal address */
+		if (city || country || sublocation) {
+			address_uri = tracker_sparql_get_uuid_urn ();
+
+			tracker_sparql_builder_insert_open (preupdate, NULL);
+			tracker_sparql_builder_subject_iri (preupdate, address_uri);
+
+			tracker_sparql_builder_predicate (preupdate, "a");
+			tracker_sparql_builder_object (preupdate, "nco:PostalAddress");
+
+			if (sublocation) {
+				tracker_sparql_builder_predicate (preupdate, "nco:region");
+				tracker_sparql_builder_object_unvalidated (preupdate, sublocation);
+			}
+
+			if (city) {
+				tracker_sparql_builder_predicate (preupdate, "nco:locality");
+				tracker_sparql_builder_object_unvalidated (preupdate, city);
+			}
+
+			if (country) {
+				tracker_sparql_builder_predicate (preupdate, "nco:country");
+				tracker_sparql_builder_object_unvalidated (preupdate, country);
+			}
+
+			tracker_sparql_builder_insert_close (preupdate);
+		}
+
+		/* Create geolocation */
+		tracker_sparql_builder_predicate (metadata, "slo:location");
+
+		tracker_sparql_builder_object_blank_open (metadata);
+		tracker_sparql_builder_predicate (metadata, "a");
+		tracker_sparql_builder_object (metadata, "slo:GeoLocation");
+
+		if (address_uri) {
+			tracker_sparql_builder_predicate (metadata, "slo:postalAddress");
+			tracker_sparql_builder_object_iri (metadata, address_uri);
+		}
+
+		if (has_coords) {
+			tracker_sparql_builder_predicate (metadata, "slo:latitude");
+			tracker_sparql_builder_object_double (metadata, lat);
+
+			tracker_sparql_builder_predicate (metadata, "slo:longitude");
+			tracker_sparql_builder_object_double (metadata, lon);
+
+			tracker_sparql_builder_predicate (metadata, "slo:altitude");
+			tracker_sparql_builder_object_double (metadata, alt);
+		}
+
+		tracker_sparql_builder_object_blank_close (metadata);
+		g_free (address_uri);
+	}
+
+	g_free (city);
+	g_free (country);
+	g_free (sublocation);
+}
+
+static void
 extract_metadata (MetadataExtractor      *extractor,
                   const gchar            *uri,
                   TrackerSparqlBuilder   *preupdate,
@@ -518,6 +599,7 @@ extract_metadata (MetadataExtractor      *extractor,
 				g_free (composer);
 			}
 
+			add_geolocation_tags (metadata, preupdate, extractor->tagcache);
 		}
 
 		/* Audio */