/usr/share/pyshared/mutagen/easyid3.py is in python-mutagen 1.20-1ubuntu1.
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# Copyright 2006 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.
#
# $Id: id3.py 3086 2006-04-04 02:13:21Z piman $
"""Easier access to ID3 tags.
EasyID3 is a wrapper around mutagen.id3.ID3 to make ID3 tags appear
more like Vorbis or APEv2 tags.
"""
from fnmatch import fnmatchcase
import mutagen.id3
from mutagen import Metadata
from mutagen._util import DictMixin, dict_match
from mutagen.id3 import ID3, error, delete, ID3FileType
__all__ = ['EasyID3', 'Open', 'delete']
class EasyID3KeyError(KeyError, ValueError, error):
"""Raised when trying to get/set an invalid key.
Subclasses both KeyError and ValueError for API compatibility,
catching KeyError is preferred.
"""
class EasyID3(DictMixin, Metadata):
"""A file with an ID3 tag.
Like Vorbis comments, EasyID3 keys are case-insensitive ASCII
strings. Only a subset of ID3 frames are supported by default. Use
EasyID3.RegisterKey and its wrappers to support more.
You can also set the GetFallback, SetFallback, and DeleteFallback
to generic key getter/setter/deleter functions, which are called
if no specific handler is registered for a key. Additionally,
ListFallback can be used to supply an arbitrary list of extra
keys. These can be set on EasyID3 or on individual instances after
creation.
To use an EasyID3 class with mutagen.mp3.MP3:
from mutagen.mp3 import EasyMP3 as MP3
MP3(filename)
Because many of the attributes are constructed on the fly, things
like the following will not work:
ezid3["performer"].append("Joe")
Instead, you must do:
values = ezid3["performer"]
values.append("Joe")
ezid3["performer"] = values
"""
Set = {}
Get = {}
Delete = {}
List = {}
# For compatibility.
valid_keys = Get
GetFallback = None
SetFallback = None
DeleteFallback = None
ListFallback = None
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 ID3 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 ID3 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
RegisterKey = classmethod(RegisterKey)
def RegisterTextKey(cls, key, frameid):
"""Register a text key.
If the key you need to register is a simple one-to-one mapping
of ID3 frame name to EasyID3 key, then you can use this
function:
EasyID3.RegisterTextKey("title", "TIT2")
"""
def getter(id3, key):
return list(id3[frameid])
def setter(id3, key, value):
try:
frame = id3[frameid]
except KeyError:
id3.add(mutagen.id3.Frames[frameid](encoding=3, text=value))
else:
frame.encoding = 3
frame.text = value
def deleter(id3, key):
del(id3[frameid])
cls.RegisterKey(key, getter, setter, deleter)
RegisterTextKey = classmethod(RegisterTextKey)
def RegisterTXXXKey(cls, key, desc):
"""Register a user-defined text frame key.
Some ID3 tags are stored in TXXX frames, which allow a
freeform 'description' which acts as a subkey,
e.g. TXXX:BARCODE.
EasyID3.RegisterTXXXKey('barcode', 'BARCODE').
"""
frameid = "TXXX:" + desc
def getter(id3, key):
return list(id3[frameid])
def setter(id3, key, value):
try:
frame = id3[frameid]
except KeyError:
enc = 0
# Store 8859-1 if we can, per MusicBrainz spec.
for v in value:
if max(v) > u'\x7f':
enc = 3
id3.add(mutagen.id3.TXXX(encoding=enc, text=value, desc=desc))
else:
frame.text = value
def deleter(id3, key):
del(id3[frameid])
cls.RegisterKey(key, getter, setter, deleter)
RegisterTXXXKey = classmethod(RegisterTXXXKey)
def __init__(self, filename=None):
self.__id3 = ID3()
self.load = self.__id3.load
self.save = self.__id3.save
self.delete = self.__id3.delete
if filename is not None:
self.load(filename)
filename = property(lambda s: s.__id3.filename,
lambda s, fn: setattr(s.__id3, 'filename', fn))
_size = property(lambda s: s._id3.size,
lambda s, fn: setattr(s.__id3, '_size', fn))
def __getitem__(self, key):
key = key.lower()
func = dict_match(self.Get, key, self.GetFallback)
if func is not None:
return func(self.__id3, key)
else:
raise EasyID3KeyError("%r is not a valid key" % key)
def __setitem__(self, key, value):
key = key.lower()
if isinstance(value, basestring):
value = [value]
func = dict_match(self.Set, key, self.SetFallback)
if func is not None:
return func(self.__id3, key, value)
else:
raise EasyID3KeyError("%r is not a valid key" % key)
def __delitem__(self, key):
key = key.lower()
func = dict_match(self.Delete, key, self.DeleteFallback)
if func is not None:
return func(self.__id3, key)
else:
raise EasyID3KeyError("%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.__id3, key))
elif key in self:
keys.append(key)
if self.ListFallback is not None:
keys.extend(self.ListFallback(self.__id3, ""))
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)
Open = EasyID3
def genre_get(id3, key):
return id3["TCON"].genres
def genre_set(id3, key, value):
try:
frame = id3["TCON"]
except KeyError:
id3.add(mutagen.id3.TCON(encoding=3, text=value))
else:
frame.encoding = 3
frame.genres = value
def genre_delete(id3, key):
del(id3["TCON"])
def date_get(id3, key):
return [stamp.text for stamp in id3["TDRC"].text]
def date_set(id3, key, value):
id3.add(mutagen.id3.TDRC(encoding=3, text=value))
def date_delete(id3, key):
del(id3["TDRC"])
def performer_get(id3, key):
people = []
wanted_role = key.split(":", 1)[1]
try:
mcl = id3["TMCL"]
except KeyError:
raise KeyError(key)
for role, person in mcl.people:
if role == wanted_role:
people.append(person)
if people:
return people
else:
raise KeyError(key)
def performer_set(id3, key, value):
wanted_role = key.split(":", 1)[1]
try:
mcl = id3["TMCL"]
except KeyError:
mcl = mutagen.id3.TMCL(encoding=3, people=[])
id3.add(mcl)
mcl.encoding = 3
people = [p for p in mcl.people if p[0] != wanted_role]
for v in value:
people.append((wanted_role, v))
mcl.people = people
def performer_delete(id3, key):
wanted_role = key.split(":", 1)[1]
try:
mcl = id3["TMCL"]
except KeyError:
raise KeyError(key)
people = [p for p in mcl.people if p[0] != wanted_role]
if people == mcl.people:
raise KeyError(key)
elif people:
mcl.people = people
else:
del(id3["TMCL"])
def performer_list(id3, key):
try: mcl = id3["TMCL"]
except KeyError:
return []
else:
return list(set("performer:" + p[0] for p in mcl.people))
def musicbrainz_trackid_get(id3, key):
return [id3["UFID:http://musicbrainz.org"].data.decode('ascii')]
def musicbrainz_trackid_set(id3, key, value):
if len(value) != 1:
raise ValueError("only one track ID may be set per song")
value = value[0].encode('ascii')
try:
frame = id3["UFID:http://musicbrainz.org"]
except KeyError:
frame = mutagen.id3.UFID(owner="http://musicbrainz.org", data=value)
id3.add(frame)
else:
frame.data = value
def musicbrainz_trackid_delete(id3, key):
del(id3["UFID:http://musicbrainz.org"])
def website_get(id3, key):
urls = [frame.url for frame in id3.getall("WOAR")]
if urls:
return urls
else:
raise EasyID3KeyError(key)
def website_set(id3, key, value):
id3.delall("WOAR")
for v in value:
id3.add(mutagen.id3.WOAR(url=v))
def website_delete(id3, key):
id3.delall("WOAR")
def gain_get(id3, key):
try:
frame = id3["RVA2:" + key[11:-5]]
except KeyError:
raise EasyID3KeyError(key)
else:
return [u"%+f dB" % frame.gain]
def gain_set(id3, key, value):
if len(value) != 1:
raise ValueError("there must be exactly one gain value, not %r.", value)
gain = float(value[0].split()[0])
try:
frame = id3["RVA2:" + key[11:-5]]
except KeyError:
frame = mutagen.id3.RVA2(desc=key[11:-5], gain=0, peak=0, channel=1)
id3.add(frame)
frame.gain = gain
def gain_delete(id3, key):
try:
frame = id3["RVA2:" + key[11:-5]]
except KeyError:
pass
else:
if frame.peak:
frame.gain = 0.0
else:
del(id3["RVA2:" + key[11:-5]])
def peak_get(id3, key):
try:
frame = id3["RVA2:" + key[11:-5]]
except KeyError:
raise EasyID3KeyError(key)
else:
return [u"%f" % frame.peak]
def peak_set(id3, key, value):
if len(value) != 1:
raise ValueError("there must be exactly one peak value, not %r.", value)
peak = float(value[0])
if peak >= 2 or peak < 0:
raise ValueError("peak must be => 0 and < 2.")
try:
frame = id3["RVA2:" + key[11:-5]]
except KeyError:
frame = mutagen.id3.RVA2(desc=key[11:-5], gain=0, peak=0, channel=1)
id3.add(frame)
frame.peak = peak
def peak_delete(id3, key):
try:
frame = id3["RVA2:" + key[11:-5]]
except KeyError:
pass
else:
if frame.gain:
frame.peak = 0.0
else:
del(id3["RVA2:" + key[11:-5]])
def peakgain_list(id3, key):
keys = []
for frame in id3.getall("RVA2"):
keys.append("replaygain_%s_gain" % frame.desc)
keys.append("replaygain_%s_peak" % frame.desc)
return keys
for frameid, key in {
"TALB": "album",
"TBPM": "bpm",
"TCMP": "compilation", # iTunes extension
"TCOM": "composer",
"TCOP": "copyright",
"TENC": "encodedby",
"TEXT": "lyricist",
"TLEN": "length",
"TMED": "media",
"TMOO": "mood",
"TIT2": "title",
"TIT3": "version",
"TPE1": "artist",
"TPE2": "performer",
"TPE3": "conductor",
"TPE4": "arranger",
"TPOS": "discnumber",
"TPUB": "organization",
"TRCK": "tracknumber",
"TOLY": "author",
"TSO2": "albumartistsort", # iTunes extension
"TSOA": "albumsort",
"TSOC": "composersort", # iTunes extension
"TSOP": "artistsort",
"TSOT": "titlesort",
"TSRC": "isrc",
"TSST": "discsubtitle",
}.iteritems():
EasyID3.RegisterTextKey(key, frameid)
EasyID3.RegisterKey("genre", genre_get, genre_set, genre_delete)
EasyID3.RegisterKey("date", date_get, date_set, date_delete)
EasyID3.RegisterKey(
"performer:*", performer_get, performer_set, performer_delete,
performer_list)
EasyID3.RegisterKey("musicbrainz_trackid", musicbrainz_trackid_get,
musicbrainz_trackid_set, musicbrainz_trackid_delete)
EasyID3.RegisterKey("website", website_get, website_set, website_delete)
EasyID3.RegisterKey("website", website_get, website_set, website_delete)
EasyID3.RegisterKey(
"replaygain_*_gain", gain_get, gain_set, gain_delete, peakgain_list)
EasyID3.RegisterKey("replaygain_*_peak", peak_get, peak_set, peak_delete)
# At various times, information for this came from
# http://musicbrainz.org/docs/specs/metadata_tags.html
# http://bugs.musicbrainz.org/ticket/1383
# http://musicbrainz.org/doc/MusicBrainzTag
for desc, key in {
u"MusicBrainz Artist Id": "musicbrainz_artistid",
u"MusicBrainz Album Id": "musicbrainz_albumid",
u"MusicBrainz Album Artist Id": "musicbrainz_albumartistid",
u"MusicBrainz TRM Id": "musicbrainz_trmid",
u"MusicIP PUID": "musicip_puid",
u"MusicMagic Fingerprint": "musicip_fingerprint",
u"MusicBrainz Album Status": "musicbrainz_albumstatus",
u"MusicBrainz Album Type": "musicbrainz_albumtype",
u"MusicBrainz Album Release Country": "releasecountry",
u"MusicBrainz Disc Id": "musicbrainz_discid",
u"ASIN": "asin",
u"ALBUMARTISTSORT": "albumartistsort",
u"BARCODE": "barcode",
}.iteritems():
EasyID3.RegisterTXXXKey(key, desc)
class EasyID3FileType(ID3FileType):
"""Like ID3FileType, but uses EasyID3 for tags."""
ID3 = EasyID3
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