Add MP4 load(s) support [#14]

src/audio_metadata/api.py

@@ -19,6 +19,7 @@
 from .formats import (
 	FLAC,
 	MP3,
+	MP4,
 	WAV,
 	ID3v2,
 	MP3StreamInfo,
@@ -61,6 +62,12 @@ def determine_format(data):
 	if d.startswith(b'RIFF'):
 		return WAV
 
+	if (
+		d[4:8].lower() == b'ftyp'
+		and d[8:12].lower() in (b'dash', b'm4a ')
+	):
+		return MP4
+
 	if d.startswith(b'ID3'):
 		ID3v2.load(data)
 

src/audio_metadata/exceptions.py

@@ -1,5 +1,6 @@
 __all__ = [
 	'AudioMetadataException',
+	'InvalidAtom',
 	'InvalidBlock',
 	'InvalidChunk',
 	'InvalidComment',
@@ -16,6 +17,12 @@ class AudioMetadataException(Exception):
 	pass
 
 
+class InvalidAtom(AudioMetadataException):
+	"""Exception raised when an MPEG atom is invalid."""
+
+	pass
+
+
 class InvalidBlock(AudioMetadataException):
 	"""Exception raised when a FLAC metadata block is invalid."""
 

src/audio_metadata/formats/__init__.py

@@ -3,6 +3,7 @@
 from .id3v2 import *
 from .id3v2_frames import *
 from .mp3 import *
+from .mp4 import *
 from .ogg import *
 from .oggopus import *
 from .tables import *
@@ -16,6 +17,7 @@
 	*id3v2_frames.__all__,
 	*id3v2.__all__,
 	*mp3.__all__,
+	*mp4.__all__,
 	*ogg.__all__,
 	*oggopus.__all__,
 	*tables.__all__,