embedart: Preempt wrong-type error in AAC files

beets/art.py

@@ -53,6 +53,7 @@ def embed_item(log, item, imagepath, maxwidth=None, itempath=None,
                compare_threshold=0, ifempty=False, as_album=False):
     """Embed an image into the item's media file.
     """
+    # Conditions and filters.
     if compare_threshold:
         if not check_art_similarity(log, item, imagepath, compare_threshold):
             log.info(u'Image not similar; skipping.')
@@ -63,12 +64,21 @@ def embed_item(log, item, imagepath, maxwidth=None, itempath=None,
     if maxwidth and not as_album:
         imagepath = resize_image(log, imagepath, maxwidth)
 
+    # Get the `Image` object from the file.
     try:
         log.debug(u'embedding {0}', displayable_path(imagepath))
         image = mediafile_image(imagepath, maxwidth)
     except IOError as exc:
         log.warning(u'could not read image file: {0}', exc)
         return
+
+    # Make sure the image kind is safe (some formats only support PNG
+    # and JPEG).
+    if image.mime_type not in ('image/jpeg', 'image/png'):
+        log.info('not embedding image of unsupported type: {}',
+                 image.mime_type)
+        return
+
     item.try_write(path=itempath, tags={'images': [image]})
 
 

docs/changelog.rst

@@ -13,6 +13,8 @@ Fixes:
   and :doc:`/plugins/thumbnails`). :bug:`1448`
 * :doc:`/plugins/permissions`: Fix an error with non-ASCII paths. :bug:`1449`
 * Fix sorting by paths when case-insensitive. :bug:`1451`
+* :doc:`/plugins/embedart`: Avoid an error when trying to embed invalid images
+  into MPEG-4 files.
 
 
 1.3.13 (April 24, 2015)

test/test_embedart.py

@@ -18,6 +18,7 @@
 import os.path
 import shutil
 from mock import patch
+import tempfile
 
 from test import _common
 from test._common import unittest
@@ -87,6 +88,22 @@ def test_art_file_missing(self):
         with self.assertRaises(ui.UserError):
             self.run_command('embedart', '-f', '/doesnotexist')
 
+    def test_embed_non_image_file(self):
+        album = self.add_album_fixture()
+        logging.getLogger('beets.embedart').setLevel(logging.DEBUG)
+
+        handle, tmp_path = tempfile.mkstemp()
+        os.write(handle, 'I am not an image.')
+        os.close(handle)
+
+        try:
+            self.run_command('embedart', '-f', tmp_path)
+        finally:
+            os.remove(tmp_path)
+
+        mediafile = MediaFile(syspath(album.items()[0].path))
+        self.assertFalse(mediafile.images)  # No image added.
+
     @require_artresizer_compare
     def test_reject_different_art(self):
         self._setup_data(self.abbey_artpath)