use track length over recording length

Closes #341. Also, 666 tests! Woohoo!

--HG--
extra : amend_source : f00626f20e2475edcf220772223080ef62f46d84

beets/autotag/mb.py

@@ -156,7 +156,7 @@ def track_info(recording, index=None, medium=None, medium_index=None):
         info.artist_id = artist['id']
 
     if recording.get('length'):
-        info.length = int(recording['length'])/(1000.0)
+        info.length = int(recording['length']) / (1000.0)
 
     info.decode()
     return info
@@ -203,6 +203,10 @@ def album_info(release):
                 # Track title may be distinct from underlying recording
                 # title.
                 ti.title = track['title']
+            if track.get('length'):
+                # Track duration is preferred over the recording
+                # duration.
+                ti.length = int(track['length']) / (1000.0)
             ti.disctitle = disctitle
             track_infos.append(ti)
     info = beets.autotag.hooks.AlbumInfo(

docs/changelog.rst

@@ -25,6 +25,8 @@ And some fixes:
 * Fix a crash when a file's metadata included a very large number (one wider
   than 64 bits). These huge numbers are now replaced with zeroes in the
   database.
+* When a track on a MusicBrainz release has a different length from the
+  underlying recording's length, the track length is now used instead.
 
 .. _Opus: http://www.opus-codec.org/
 

test/test_mb.py

@@ -20,7 +20,7 @@ from beets.autotag import mb
 from beets import config
 
 class MBAlbumInfoTest(_common.TestCase):
-    def _make_release(self, date_str='2009', tracks=None):
+    def _make_release(self, date_str='2009', tracks=None, track_length=None):
         release = {
             'title': 'ALBUM TITLE',
             'id': 'ALBUM ID',
@@ -57,11 +57,15 @@ class MBAlbumInfoTest(_common.TestCase):
         }
         if tracks:
             track_list = []
-            for i, track in enumerate(tracks):
-                track_list.append({
-                    'recording': track,
-                    'position': str(i+1),
-                })
+            for i, recording in enumerate(tracks):
+                track = {
+                    'recording': recording,
+                    'position': str(i + 1),
+                }
+                if track_length:
+                    # Track lengths are distinct from recording lengths.
+                    track['length'] = track_length
+                track_list.append(track)
             release['medium-list'].append({
                 'position': '1',
                 'track-list': track_list,
@@ -186,6 +190,12 @@ class MBAlbumInfoTest(_common.TestCase):
         d = mb.album_info(release)
         self.assertEqual(d.tracks[0].length, None)
 
+    def test_track_length_overrides_recording_length(self):
+        tracks = [self._make_track('TITLE', 'ID', 1.0 * 1000.0)]
+        release = self._make_release(tracks=tracks, track_length=2.0 * 1000.0)
+        d = mb.album_info(release)
+        self.assertEqual(d.tracks[0].length, 2.0)
+
     def test_no_release_date(self):
         release = self._make_release(None)
         d = mb.album_info(release)