[tracker] extractor: Store albumArtist from TPE2 tag

[Carlos Garnacho <carlosg src gnome org>]

commit 79af6adf6ee37591f2c6d44720735f5f81dd96d7
Author: Gaurav Narula <gnarula94 gmail com>
Date:   Thu Mar 24 18:52:33 2016 +0530

    extractor: Store albumArtist from TPE2 tag
    
    https://bugzilla.gnome.org/show_bug.cgi?id=764143

 src/tracker-extract/tracker-extract-mp3.c |   34 +++++++++++++++++++++++++---
 1 files changed, 30 insertions(+), 4 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-mp3.c b/src/tracker-extract/tracker-extract-mp3.c
index 0a13642..8a78a19 100644
--- a/src/tracker-extract/tracker-extract-mp3.c
+++ b/src/tracker-extract/tracker-extract-mp3.c
@@ -153,6 +153,8 @@ typedef struct {
        const gchar *title;
        const gchar *performer;
        gchar *performer_uri;
+       const gchar *album_artist;
+       gchar *album_artist_uri;
        const gchar *lyricist;
        gchar *lyricist_uri;
        const gchar *album;
@@ -1067,7 +1069,7 @@ id3v2_strlen (const gchar  encoding,
        switch (encoding) {
        case 0x01:
        case 0x02:
-               
+
                /* UTF-16, string terminated by two NUL bytes */
                pos = memmem (text, len, "\0\0\0", 3);
 
@@ -2372,6 +2374,10 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                                               md.id3v22.performer2,
                                               md.id3v1.artist);
 
+       md.album_artist = tracker_coalesce_strip (3, md.id3v24.performer2,
+                                                 md.id3v23.performer2,
+                                                 md.id3v22.performer2);
+
        md.album = tracker_coalesce_strip (4, md.id3v24.album,
                                           md.id3v23.album,
                                           md.id3v22.album,
@@ -2467,6 +2473,26 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                tracker_sparql_builder_insert_close (preupdate);
        }
 
+       if (md.album_artist) {
+               md.album_artist_uri = tracker_sparql_escape_uri_printf ("urn:artist:%s", md.album_artist);
+
+               tracker_sparql_builder_insert_open (preupdate, NULL);
+               if (graph) {
+                       tracker_sparql_builder_graph_open (preupdate, graph);
+               }
+
+               tracker_sparql_builder_subject_iri (preupdate, md.album_artist_uri);
+               tracker_sparql_builder_predicate (preupdate, "a");
+               tracker_sparql_builder_object (preupdate, "nmm:Artist");
+               tracker_sparql_builder_predicate (preupdate, "nmm:artistName");
+               tracker_sparql_builder_object_unvalidated (preupdate, md.album_artist);
+
+               if (graph) {
+                       tracker_sparql_builder_graph_close (preupdate);
+               }
+               tracker_sparql_builder_insert_close (preupdate);
+       }
+
        if (md.composer) {
                md.composer_uri = tracker_sparql_escape_uri_printf ("urn:artist:%s", md.composer);
 
@@ -2524,9 +2550,9 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                tracker_sparql_builder_predicate (preupdate, "nmm:albumTitle");
                tracker_sparql_builder_object_unvalidated (preupdate, md.album);
 
-               if (md.performer_uri) {
+               if (md.album_artist_uri) {
                        tracker_sparql_builder_predicate (preupdate, "nmm:albumArtist");
-                       tracker_sparql_builder_object_iri (preupdate, md.performer_uri);
+                       tracker_sparql_builder_object_iri (preupdate, md.album_artist_uri);
                }
 
                if (graph) {
@@ -2689,6 +2715,7 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
        }
 
        g_free (md.album_uri);
+       g_free (md.album_artist_uri);
 
        /* Get mp3 stream info */
        parsed = mp3_parse (buffer, buffer_size, audio_offset, uri, metadata, &md);
@@ -2749,4 +2776,3 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
 
        return parsed;
 }
-