tag: added tag "AlbumArtistSort"

The tag_id3.c library supports both the documented "TSO2" tag, and the
inofficial TXXX/ALBUMARTISTSORT.

The Vorbis/FLAC decoder automatically supports the new tag, without
further change.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/tag.h b/src/tag.h
index 4b72dd18..d6875300 100644
--- a/src/tag.h
+++ b/src/tag.h
@@ -34,6 +34,7 @@ enum tag_type {
 	TAG_ITEM_ARTIST,
 	TAG_ITEM_ALBUM,
 	TAG_ITEM_ALBUM_ARTIST,
+	TAG_ALBUM_ARTIST_SORT,
 	TAG_ITEM_TITLE,
 	TAG_ITEM_TRACK,
 	TAG_ITEM_NAME,