fingerprinting track distance based on MB track IDs

NEWS

@@ -1,3 +1,18 @@
+1.0b5
+-----
+* A new plugin, "lastid", adds Last.fm acoustic fingerprinting support
+  to the autotagger. Similar to the PUIDs used by MusicBrainz Picard,
+  this system allows beets to recognize files that don't have any
+  metadata at all. (You'll need to install some dependencies for this
+  plugin to work; documentation is forthcoming.)
+* To support the above, there's also a new system for extending the
+  autotagger via plugins. Plugins can currently add components to the
+  track distance function.
+* New event system for plugins (thanks, Jeff!). Plugins can now get
+  callbacks from beets when certain events occur in the core.
+* Fixed bug that completely broke non-autotagged imports ("import -A").
+* A new "-v" command line switch enables debugging output.
+
 1.0b4
 -----
 * Parallel tagger. The autotagger has been reimplemented to use

beetsplug/lastid.py

@@ -22,9 +22,10 @@ from beets import autotag
 import lastfp
 import logging
 
-log = logging.getLogger('beets')
 API_KEY = '2dc3914abf35f0d9c92d97d8f8e42b43'
 
+log = logging.getLogger('beets')
+
 _match_cache = {}
 def match(path, metadata=None):
     """Gets the metadata from Last.fm for the indicated track. Returns
@@ -54,10 +55,21 @@ class LastIdPlugin(BeetsPlugin):
             # Match failed.
             return 0.0, 0.0
 
-        dist = autotag._ie_dist(last_data['title'],
+        dist, dist_max = 0.0, 0.0
+
+        # Track title distance.
+        dist += autotag._ie_dist(last_data['title'],
                                 info['title']) \
-               * autotag.TRACK_TITLE_WEIGHT
-        dist_max = autotag.TRACK_TITLE_WEIGHT
+                * autotag.TRACK_TITLE_WEIGHT
+        dist_max += autotag.TRACK_TITLE_WEIGHT
+        
+        # MusicBrainz track ID.
+        if last_data['track_mbid']:
+            log.debug('Last track ID match: %s/%s' %
+                      (last_data['track_mbid'], track_data['id']))
+            if last_data['track_mbid'] != track_data['id']:
+                dist += autotag.TRACK_ID_WEIGHT
+            dist_max += autotag.TRACK_ID_WEIGHT
 
         log.debug('Last data: %s; distance: %f' %
                   (str(last_data), dist/dist_max))