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# -*- coding: utf-8 -*-
# Copyright 2013 Sebastian Ramacher <sebastian+dev@ramacher.at>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
""" python-discid compat layer
This module provides a compatible layer so that python-libdiscid can be used as
a replacement for python-discid. It provides an interface compatible with
python-discid version 1.0.2.
"""
import libdiscid
import operator
import functools
import sys
try:
unicode
except NameError:
# 2/3 compat
unicode = str
_INVERSE_FEATURES= {
libdiscid.FEATURES_MAPPING[libdiscid.FEATURE_READ]: libdiscid.FEATURE_READ,
libdiscid.FEATURES_MAPPING[libdiscid.FEATURE_MCN]: libdiscid.FEATURE_MCN,
libdiscid.FEATURES_MAPPING[libdiscid.FEATURE_ISRC]: libdiscid.FEATURE_ISRC
}
class _NoneHelper(object):
def __getattr__(self, name):
if name in ('id', 'freedb_id', 'submission_url', 'toc',
'first_track', 'last_track', 'sectors', 'mcn'):
return None
return super(_NoneHelper, self).__getattr__(name)
def _decode(string, encoding=None):
# Let's do the same thing discid is doing. It always accepts both strings and
# unicode objects and encodes/decodes them as it sees fit. libdiscid always
# wants unicode objects, so let's decode it here on a best effort basis.
if not isinstance(string, unicode):
if encoding is None:
encoding = sys.getfilesystemencoding() or 'ascii'
return string.decode(encoding)
return string
# exceptions defined in discid
DiscError = libdiscid.DiscError
class TOCError(Exception):
pass
# classes defined in discid
class Track(object):
def __init__(self, disc, number):
self.disc = disc
self.number = number
def __str__(self):
return str(self.number)
@property
def offset(self):
return self.disc.track_offsets[self.number - self.disc.first_track]
@property
def sectors(self):
return self.disc.track_lengths[self.number - self.disc.first_track]
length = sectors
@property
def seconds(self):
return libdiscid.sectors_to_seconds(self.sectors)
@property
def isrc(self):
try:
value = self.disc.track_isrcs[self.number - self.disc.first_track]
except NotImplementedError:
return None
return value if value != '' else None
class Disc(object):
def __init__(self):
self.disc = _NoneHelper()
self.tracks = []
def read(self, device, features=[]):
self.disc = libdiscid.read(device, functools.reduce(
operator.or_, (
_INVERSE_FEATURES[feature]
for feature in features if feature in FEATURES
), 0))
self.tracks = [
Track(self.disc, numb) for numb in range(self.disc.first_track,
self.disc.last_track + 1)]
return True
def put(self, first, last, disc_sectors, track_offsets):
try:
self.disc = libdiscid.put(first, last, disc_sectors, track_offsets)
except DiscError as disc_error:
raise TOCError(str(disc_error))
self.tracks = [
Track(self.disc, num) for num in range(self.disc.first_track,
self.disc.last_track + 1)]
return True
@property
def id(self):
return self.disc.id
@property
def freedb_id(self):
return self.disc.freedb_id
@property
def submission_url(self):
return self.disc.submission_url
@property
def toc_string(self):
return self.disc.toc
@property
def first_track_num(self):
return self.disc.first_track
@property
def last_track_num(self):
return self.disc.last_track
@property
def sectors(self):
return self.disc.sectors
length = sectors
@property
def seconds(self):
return libdiscid.sectors_to_seconds(self.sectors) \
if self.sectors is not None else None
@property
def mcn(self):
try:
value = self.disc.mcn
except NotImplementedError:
return None
return value if value != '' else None
# functions defined in discid
get_default_device = libdiscid.default_device
def read(device=None, features=[]):
disc = Disc()
disc.read(_decode(device) if device is not None else None,
map(lambda feature: _decode(feature, 'ascii'), features))
return disc
def put(first, last, disc_sectors, track_offsets):
disc = Disc()
disc.put(first, last, disc_sectors, track_offsets)
return disc
# constants defined in discid
__version__ = '1.1.0 (compat layer from python-libdiscid %s)' % \
(libdiscid.__version__, )
""" This is the version of python-discid this layer is compatible with. """
LIBDISCID_VERSION_STRING = libdiscid.__discid_version__
FEATURES = libdiscid.FEATURES
FEATURES_IMPLEMENTED = (libdiscid.FEATURE_READ, libdiscid.FEATURE_MCN,
libdiscid.FEATURE_ISRC)
__all__ = (
'read', 'put', 'get_default_device',
'__version__', 'LIBDISCID_VERSION_STRING', 'FEATURES', 'FEATURES_IMPLEMENTED',
'Disc', 'DiscError', 'TOCError'
)
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