added avif image support

README.rst

@@ -77,6 +77,7 @@ Image
 -  **psd** - ``image/vnd.adobe.photoshop``
 -  **ico** - ``image/x-icon``
 -  **heic** - ``image/heic``
+-  **avif** - ``image/avif``
 
 Video
 ^^^^^

filetype/types/__init__.py

@@ -29,6 +29,7 @@
     image.Ico(),
     image.Heic(),
     image.Dcm(),
+    image.Avif(),
 )
 
 # Supported video types

filetype/types/image.py

@@ -356,3 +356,28 @@ def __init__(self):
     def match(self, buf):
         return buf[:10] == bytearray([0x67, 0x69, 0x6d, 0x70, 0x20,
                                       0x78, 0x63, 0x66, 0x20, 0x76])
+
+
+class Avif(IsoBmff):
+    """
+    Implements the AVIF image type matcher.
+    """
+    MIME = 'image/avif'
+    EXTENSION = 'avif'
+
+    def __init__(self):
+        super(Avif, self).__init__(
+            mime=Avif.MIME,
+            extension=Avif.EXTENSION
+        )
+
+    def match(self, buf):
+        if not self._is_isobmff(buf):
+            return False
+
+        major_brand, minor_version, compatible_brands = self._get_ftyp(buf)
+        if major_brand == 'avif':
+            return True
+        if major_brand in ['mif1', 'msf1'] and 'avif' in compatible_brands:
+            return True
+        return False

tests/test_types.py

@@ -44,6 +44,12 @@ def test_guess_heic(self):
         self.assertEqual(kind.mime, 'image/heic')
         self.assertEqual(kind.extension, 'heic')
 
+    def test_guess_avif(self):
+        kind = filetype.guess(FIXTURES + '/sample.avif')
+        self.assertTrue(kind is not None)
+        self.assertEqual(kind.mime, 'image/avif')
+        self.assertEqual(kind.extension, 'avif')
+
     def test_guess_mp4(self):
         kind = filetype.guess(FIXTURES + '/sample.mp4')
         self.assertTrue(kind is not None)