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""" Take care of mutagen-supported formats (audio)
"""
from libmat import parser
import mutagen
from mutagen.flac import FLAC
from mutagen.oggvorbis import OggVorbis
from mutagen.mp3 import MP3
class MutagenStripper(parser.GenericParser):
""" Parser using the (awesome) mutagen library. """
def __init__(self, filename, mime, backup, is_writable, **kwargs):
super(MutagenStripper, self).__init__(filename, mime, backup, is_writable, **kwargs)
self.mfile = None # This will be instanciated in self._create_mfile()
self._create_mfile()
def _create_mfile(self):
""" This method must be overridden to instantiate the `mfile` attribute."""
raise NotImplementedError
def is_clean(self):
""" Check if the file is clean. """
return not self.mfile.tags
def remove_all(self):
""" Remove all harmful metadata. """
if self.backup:
self.create_backup_copy()
self.mfile.delete()
try: # mutagen will choke on files without a metadata block
self.mfile.save()
except ValueError:
pass
return True
def get_meta(self):
"""
Return the content of the metadata block is present
"""
metadata = {}
if self.mfile.tags:
for key, value in self.mfile.tags:
metadata[key] = value
return metadata
class MpegAudioStripper(MutagenStripper):
""" Represent a mp3 vorbis file
"""
def _create_mfile(self):
self.mfile = MP3(self.filename)
def get_meta(self):
"""
Return the content of the metadata block is present
"""
metadata = {}
if self.mfile.tags:
for key in self.mfile.tags.keys():
meta = self.mfile.tags[key]
try: # Sometimes, the field has a human-redable description
desc = meta.desc
except AttributeError:
desc = key
text = meta.text[0]
metadata[desc] = text
return metadata
class OggStripper(MutagenStripper):
""" Represent an ogg vorbis file
"""
def _create_mfile(self):
self.mfile = OggVorbis(self.filename)
class FlacStripper(MutagenStripper):
""" Represent a Flac audio file
"""
def _create_mfile(self):
self.mfile = FLAC(self.filename)
def remove_all(self):
""" Remove the "metadata" block from the file
"""
super(FlacStripper, self).remove_all()
self.mfile.clear_pictures()
self.mfile.save()
return True
def is_clean(self):
""" Check if the "metadata" block is present in the file
"""
return super(FlacStripper, self).is_clean() and not self.mfile.pictures
def get_meta(self):
""" Return the content of the metadata block if present
"""
metadata = super(FlacStripper, self).get_meta()
if self.mfile.pictures:
metadata['picture:'] = 'yes'
return metadata
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