/usr/lib/python2.7/dist-packages/mutagen/easymp4.py is in python-mutagen 1.31-1ubuntu1.
This file is owned by root:root, with mode 0o644.
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# Copyright (C) 2009 Joe Wreschnig
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
from mutagen import Metadata
from mutagen._util import DictMixin, dict_match
from mutagen.mp4 import MP4, MP4Tags, error, delete
from ._compat import PY2, text_type, PY3
__all__ = ["EasyMP4Tags", "EasyMP4", "delete", "error"]
class EasyMP4KeyError(error, KeyError, ValueError):
pass
class EasyMP4Tags(DictMixin, Metadata):
"""A file with MPEG-4 iTunes metadata.
Like Vorbis comments, EasyMP4Tags keys are case-insensitive ASCII
strings, and values are a list of Unicode strings (and these lists
are always of length 0 or 1).
If you need access to the full MP4 metadata feature set, you should use
MP4, not EasyMP4.
"""
Set = {}
Get = {}
Delete = {}
List = {}
def __init__(self, *args, **kwargs):
self.__mp4 = MP4Tags(*args, **kwargs)
self.load = self.__mp4.load
self.save = self.__mp4.save
self.delete = self.__mp4.delete
self._padding = self.__mp4._padding
filename = property(lambda s: s.__mp4.filename,
lambda s, fn: setattr(s.__mp4, 'filename', fn))
@classmethod
def RegisterKey(cls, key,
getter=None, setter=None, deleter=None, lister=None):
"""Register a new key mapping.
A key mapping is four functions, a getter, setter, deleter,
and lister. The key may be either a string or a glob pattern.
The getter, deleted, and lister receive an MP4Tags instance
and the requested key name. The setter also receives the
desired value, which will be a list of strings.
The getter, setter, and deleter are used to implement __getitem__,
__setitem__, and __delitem__.
The lister is used to implement keys(). It should return a
list of keys that are actually in the MP4 instance, provided
by its associated getter.
"""
key = key.lower()
if getter is not None:
cls.Get[key] = getter
if setter is not None:
cls.Set[key] = setter
if deleter is not None:
cls.Delete[key] = deleter
if lister is not None:
cls.List[key] = lister
@classmethod
def RegisterTextKey(cls, key, atomid):
"""Register a text key.
If the key you need to register is a simple one-to-one mapping
of MP4 atom name to EasyMP4Tags key, then you can use this
function::
EasyMP4Tags.RegisterTextKey("artist", "\xa9ART")
"""
def getter(tags, key):
return tags[atomid]
def setter(tags, key, value):
tags[atomid] = value
def deleter(tags, key):
del(tags[atomid])
cls.RegisterKey(key, getter, setter, deleter)
@classmethod
def RegisterIntKey(cls, key, atomid, min_value=0, max_value=(2 ** 16) - 1):
"""Register a scalar integer key.
"""
def getter(tags, key):
return list(map(text_type, tags[atomid]))
def setter(tags, key, value):
clamp = lambda x: int(min(max(min_value, x), max_value))
tags[atomid] = [clamp(v) for v in map(int, value)]
def deleter(tags, key):
del(tags[atomid])
cls.RegisterKey(key, getter, setter, deleter)
@classmethod
def RegisterIntPairKey(cls, key, atomid, min_value=0,
max_value=(2 ** 16) - 1):
def getter(tags, key):
ret = []
for (track, total) in tags[atomid]:
if total:
ret.append(u"%d/%d" % (track, total))
else:
ret.append(text_type(track))
return ret
def setter(tags, key, value):
clamp = lambda x: int(min(max(min_value, x), max_value))
data = []
for v in value:
try:
tracks, total = v.split("/")
tracks = clamp(int(tracks))
total = clamp(int(total))
except (ValueError, TypeError):
tracks = clamp(int(v))
total = min_value
data.append((tracks, total))
tags[atomid] = data
def deleter(tags, key):
del(tags[atomid])
cls.RegisterKey(key, getter, setter, deleter)
@classmethod
def RegisterFreeformKey(cls, key, name, mean="com.apple.iTunes"):
"""Register a text key.
If the key you need to register is a simple one-to-one mapping
of MP4 freeform atom (----) and name to EasyMP4Tags key, then
you can use this function::
EasyMP4Tags.RegisterFreeformKey(
"musicbrainz_artistid", "MusicBrainz Artist Id")
"""
atomid = "----:" + mean + ":" + name
def getter(tags, key):
return [s.decode("utf-8", "replace") for s in tags[atomid]]
def setter(tags, key, value):
encoded = []
for v in value:
if not isinstance(v, text_type):
if PY3:
raise TypeError("%r not str" % v)
v = v.decode("utf-8")
encoded.append(v.encode("utf-8"))
tags[atomid] = encoded
def deleter(tags, key):
del(tags[atomid])
cls.RegisterKey(key, getter, setter, deleter)
def __getitem__(self, key):
key = key.lower()
func = dict_match(self.Get, key)
if func is not None:
return func(self.__mp4, key)
else:
raise EasyMP4KeyError("%r is not a valid key" % key)
def __setitem__(self, key, value):
key = key.lower()
if PY2:
if isinstance(value, basestring):
value = [value]
else:
if isinstance(value, text_type):
value = [value]
func = dict_match(self.Set, key)
if func is not None:
return func(self.__mp4, key, value)
else:
raise EasyMP4KeyError("%r is not a valid key" % key)
def __delitem__(self, key):
key = key.lower()
func = dict_match(self.Delete, key)
if func is not None:
return func(self.__mp4, key)
else:
raise EasyMP4KeyError("%r is not a valid key" % key)
def keys(self):
keys = []
for key in self.Get.keys():
if key in self.List:
keys.extend(self.List[key](self.__mp4, key))
elif key in self:
keys.append(key)
return keys
def pprint(self):
"""Print tag key=value pairs."""
strings = []
for key in sorted(self.keys()):
values = self[key]
for value in values:
strings.append("%s=%s" % (key, value))
return "\n".join(strings)
for atomid, key in {
'\xa9nam': 'title',
'\xa9alb': 'album',
'\xa9ART': 'artist',
'aART': 'albumartist',
'\xa9day': 'date',
'\xa9cmt': 'comment',
'desc': 'description',
'\xa9grp': 'grouping',
'\xa9gen': 'genre',
'cprt': 'copyright',
'soal': 'albumsort',
'soaa': 'albumartistsort',
'soar': 'artistsort',
'sonm': 'titlesort',
'soco': 'composersort',
}.items():
EasyMP4Tags.RegisterTextKey(key, atomid)
for name, key in {
'MusicBrainz Artist Id': 'musicbrainz_artistid',
'MusicBrainz Track Id': 'musicbrainz_trackid',
'MusicBrainz Album Id': 'musicbrainz_albumid',
'MusicBrainz Album Artist Id': 'musicbrainz_albumartistid',
'MusicIP PUID': 'musicip_puid',
'MusicBrainz Album Status': 'musicbrainz_albumstatus',
'MusicBrainz Album Type': 'musicbrainz_albumtype',
'MusicBrainz Release Country': 'releasecountry',
}.items():
EasyMP4Tags.RegisterFreeformKey(key, name)
for name, key in {
"tmpo": "bpm",
}.items():
EasyMP4Tags.RegisterIntKey(key, name)
for name, key in {
"trkn": "tracknumber",
"disk": "discnumber",
}.items():
EasyMP4Tags.RegisterIntPairKey(key, name)
class EasyMP4(MP4):
"""Like :class:`MP4 <mutagen.mp4.MP4>`,
but uses :class:`EasyMP4Tags` for tags.
:ivar info: :class:`MP4Info <mutagen.mp4.MP4Info>`
:ivar tags: :class:`EasyMP4Tags`
"""
MP4Tags = EasyMP4Tags
Get = EasyMP4Tags.Get
Set = EasyMP4Tags.Set
Delete = EasyMP4Tags.Delete
List = EasyMP4Tags.List
RegisterTextKey = EasyMP4Tags.RegisterTextKey
RegisterKey = EasyMP4Tags.RegisterKey
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