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# -*- coding: utf-8 -*-
#
# Copyright (c) 2009-2015 Felix Krull <f_krull@gmx.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
from mutagen.id3 import ID3FileType
def _get_simple_tag(tags, mp3_keys, default_key):
"""Retrieve a tag value, using either one of a few MP3 tags or a generic
one for other formats."""
if isinstance(tags, ID3FileType):
for k in mp3_keys:
frame = tags.get(k, None)
if frame:
return frame.text[0]
else:
vs = tags.get(default_key, None)
if vs:
return vs[0]
# default fall-through
return None
get_musicbrainz_album_id = lambda tags: _get_simple_tag(
tags,
["TXXX:MusicBrainz Album Id", "TXXX:MUSICBRAINZ_ALBUMID"],
"musicbrainz_albumid")
get_musicbrainz_albumartist_id = lambda tags: _get_simple_tag(
tags,
["TXXX:MusicBrainz Album Artist Id", "TXXX:MUSICBRAINZ_ALBUMARTISTID"],
"musicbrainz_albumartistid")
get_musicbrainz_artist_id = lambda tags: _get_simple_tag(
tags,
["TXXX:MusicBrainz Artist Id", "TXXX:MUSICBRAINZ_ARTISTID"],
"musicbrainz_artistid")
get_album = lambda tags: _get_simple_tag(
tags,
["TALB"],
"album")
get_artist = lambda tags: _get_simple_tag(
tags,
["TPE1"],
"artist")
# XXX: We're not doing case-insensitive checking anymore. Let's hope that
# doesn't regress anything...
# For MP3, in that order:
# - a generic "TXXX:albumartist"
# - QL's "TXXX:QuodLibet::albumartist"
# - fb2k's legacy "TXXX:ALBUM ARTIST"
# - finally, "TPE2" as used by at least fb2k and Picard. According to
# the ID3 standard, this is performer, but fb2k uses it for album
# artist since 1.1.6, citing "compatibility with other players"; see
# http://wiki.hydrogenaudio.org/index.php?title=Foobar2000:ID3_Tag_Mapping
get_albumartist = lambda tags: _get_simple_tag(
tags,
["TXXX:albumartist", "TXXX:QuodLibet::albumartist", "TXXX:ALBUM ARTIST",
"TPE2"],
"albumartist")
def _take_first_tag(tags, default, functions):
"""Return the first tag value that isn't None."""
for f in functions:
value = f(tags)
if value is not None:
return value
return default
def get_album_id(tags):
"""Try to determine an album id based on the given tags.
The basic logic is as follows:
- If a MusicBrainz album ID exists, use that.
- If an album tag exists, combine that with:
- a MusicBrainz album artist ID if it exists,
- otherwise an album artist tag if it exists,
- otherwise an artist tag if it exists,
- otherwise, nothing
and use the result.
- Otherwise, assume non-album track.
"""
mb_album_id = get_musicbrainz_album_id(tags)
if mb_album_id is not None:
return mb_album_id
album = get_album(tags)
if album is not None:
artist_part = _take_first_tag(tags, None, [
get_musicbrainz_albumartist_id,
get_albumartist,
get_artist])
if artist_part is None:
return album
else:
return u"%s - %s" % (artist_part, album)
else:
return None
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