brutus · October 1, 2015 15:15 · Oct 1, 2015
diff --git a/add.py b/add.py
@@ -0,0 +1,60 @@
+def add_image(
+  filenames, image_path, description='Cover', img_type=3, encoding=3
+):
+  """
+  Adds an image to MP3 from *filenames*.
+
+  Args:
+
+    filenames (lits): paths to the MP3
+    image_path (string): path to image file
+    description (string): optional description
+    img_type (integer): ID3 code for the iomage (3=cover)
+    encoding (integer): encoding to use (3=UTF-8)
+
+  Raises:
+
+    ArgumentError: on *image_path* errors
+
+  Image Type:
+
+    https://mutagen.readthedocs.org/en/latest/api/id3.html#mutagen.id3.PictureType
+
+  Encoding:
+
+    https://mutagen.readthedocs.org/en/latest/api/id3.html#mutagen.id3.Encoding
+
+  """
+  SUPPORTED_TYPES = (
+    '.png',
+    '.jpg', '.jpeg',
+  )
+  # check image
+  if not os.path.exists(image_path):
+    msg = "the image seems not to exists: '{}'"
+    msg = msg.format(image_path)
+    raise ArgumentError(msg)
+  img_type = os.path.splitext(image_path)[1].lower()
+  if img_type not in SUPPORTED_TYPES:
+    msg = "image type '{}' is not supported, only: {}"
+    msg = msg.format(img_type, ', '.join(SUPPORTED_TYPES))
+    raise ArgumentError(msg)
+  if img_type == 'png':
+    mime = 'image/png'
+  else:
+    mime = 'image/jpeg'
+  # add image to files
+  image = open(image_path, mode='rb').read()
+  image = APIC(
+    encoding=encoding,
+    mime=mime,
+    type=img_type,
+    desc=description,
+    data=image
+  )
+  for filename in filenames:
+    print("- {}".format(filename))
+    mp3 = MP3(filename, ID3=ID3)
+    # add image tag
+    mp3.tags.add(image)
+    mp3.save()
diff --git a/error.py b/error.py
@@ -0,0 +1,14 @@
+Traceback (most recent call last):
+  File "~/.local/bin/mp3tag", line 190, in <module>
+    sys.exit(main())
+  File "~/.local/bin/mp3tag", line 183, in main
+    add_image(args.filenames, args.image)
+  File "~/.local/bin/mp3tag", line 124, in add_image
+    data=image
+  File "~/.local/lib/python3.4/site-packages/mutagen/id3/_frames.py", line 69, in __init__
+    self, kwargs.get(checker.name, None))
+  File "~/.local/lib/python3.4/site-packages/mutagen/id3/_specs.py", line 130, in validate
+    chr_(value)
+  File "~/.local/lib/python3.4/site-packages/mutagen/_compat.py", line 64, in <lambda>
+    chr_ = lambda x: bytes([x])
+TypeError: 'str' object cannot be interpreted as an integer
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