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# Audio Tools, a module and set of tools for manipulating audio data
# Copyright (C) 2007-2015 Brian Langenberger
# 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 of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
from audiotools import PY3, Sheet, SheetTrack, SheetIndex
class CDTOC(Sheet):
"""an object representing a CDDA layout as a Vorbis comment tag"""
def __init__(self, cdtoc_tracks, lead_out):
"""cdtoc_tracks is a list of CDTOC_Track objects
lead_out is the address of the lead out"""
self.__cdtoc_tracks__ = cdtoc_tracks
self.__lead_out__ = lead_out
def __repr__(self):
return "CDTOC(%s, %s)" % (repr(self.__cdtoc_tracks__),
repr(self.__lead_out__))
if PY3:
def __str__(self):
return self.__unicode__()
else:
def __str__(self):
return self.__unicode__().encode('utf-8')
def __unicode__(self):
return u"+".join([u"%X" % (len([t for t in self if t.is_audio()]))] +
[t.__unicode__() for t in self] +
[u"%X" % (self.__lead_out__)])
@classmethod
def from_unicode(cls, u):
"""given a Unicode string, returns a CDTOC
may raise ValueError if a parsing problem occurs"""
items = u.split(u"+")
track_count = int(items[0], 16)
audio_track_addresses = [int(i, 16) for i in items[1:1 + track_count]]
remaining_items = items[1 + track_count:]
if len(remaining_items) == 1:
# all audio tracks
lead_out_address = int(remaining_items[0], 16)
return cls([CDTOC_Track(i, address) for (i, address) in
enumerate(audio_track_addresses, 1)],
lead_out_address)
elif len(remaining_items) == 2:
# might be CDExtra or Data+Audio
if remaining_items[1].startswith(u"X"):
# Data+Audio
lead_out_address = int(remaining_items[0], 16)
data_track_address = int(remaining_items[1][1:], 16)
return CDTOC_DataAudio(
[CDTOC_Track(1,
data_track_address,
False)] +
[CDTOC_Track(i, address) for (i, address) in
enumerate(audio_track_addresses, 2)],
lead_out_address)
else:
# CDExtra
data_track_address = int(remaining_items[0], 16)
lead_out_address = int(remaining_items[1], 16)
return cls([CDTOC_Track(i, address) for (i, address) in
enumerate(audio_track_addresses, 1)] +
[CDTOC_Track(track_count + 1,
data_track_address,
False)],
lead_out_address)
else:
raise ValueError("too many items")
@classmethod
def converted(cls, sheet, seconds_length):
"""given a Sheet-compatible object
and length of entire disc as a Fractional number of seconds,
returns a CDTOC"""
sheet_tracks = list(sheet)
is_audio = [t.is_audio() for t in sheet_tracks]
if False not in is_audio:
# all tracks are audio, so not CDExtra or Data+Audio
return cls([CDTOC_Track.converted(t) for t in sheet_tracks],
int(seconds_length * 75) + 150)
elif (not is_audio[0]) and (False not in is_audio[1:]):
# Data+Audio
return CDTOC_DataAudio(
[CDTOC_Track.converted(t) for t in sheet_tracks],
int(seconds_length * 75) + 150)
elif (False not in is_audio[0:-1]) and not is_audio[-1]:
# CDExtra
return cls([CDTOC_Track.converted(t) for t in sheet_tracks],
int(seconds_length * 75) + 150)
else:
raise ValueError("unsupported Sheet layout")
def __len__(self):
return len(self.__cdtoc_tracks__)
def __getitem__(self, index):
return self.__cdtoc_tracks__[index]
def track_length(self, track_number):
"""given a track_number (typically starting from 1)
returns the length of the track as a Fraction number of seconds
may raise KeyError if the track is not found"""
initial_track = self.track(track_number)
if track_number < len(self):
next_track = self.track(track_number + 1)
return (next_track.index(1).offset() -
initial_track.index(1).offset())
else:
# no next track, so return to end of lead-out
from fractions import Fraction
return (Fraction(self.__lead_out__ - 150, 75) -
initial_track.index(1).offset())
def get_metadata(self):
return None
class CDTOC_DataAudio(CDTOC):
def __init__(self, cdtoc_tracks, lead_out):
"""cdtoc_tracks is a list of CDTOC_Track objects
lead_out is the address of the lead out"""
# first track must be non-audio, rest must be audio
assert(not cdtoc_tracks[0].is_audio())
assert(False not in [t.is_audio() for t in cdtoc_tracks[1:]])
CDTOC.__init__(self, cdtoc_tracks, lead_out)
def __unicode__(self):
return u"+".join([u"%X" % (len(self) - 1)] +
[t.__unicode__() for t in self[1:]] +
[u"%X" % (self.__lead_out__),
u"X%s" % (self[0].__unicode__())])
def __repr__(self):
return "CDTOC_DataAudio(%s, %s)" % (repr(self.__cdtoc_tracks__),
repr(self.__lead_out__))
class CDTOC_Track(SheetTrack):
def __init__(self, number, address, is_audio=True):
"""number is the track number, starting from 1
address is the track's LBA + 150 value
is_audio determines whether the track contains audio data"""
self.__number__ = number
if (number == 1) and (address > 150):
# add index point 0 as pre-gap
self.__indexes__ = [CDTOC_Index(0, 150), CDTOC_Index(1, address)]
else:
self.__indexes__ = [CDTOC_Index(1, address)]
self.__is_audio__ = is_audio
@classmethod
def converted(cls, sheet_track):
"""given a SheetTrack object, returns a CDTOC_Track"""
index_1 = sheet_track.index(1).offset()
return cls(sheet_track.number(),
int(index_1 * 75) + 150,
sheet_track.is_audio())
def __len__(self):
return len(self.__indexes__)
def __getitem__(self, i):
return self.__indexes__[i]
if PY3:
def __str__(self):
return self.__unicode__()
else:
def __str__(self):
return self.__unicode__().encode('utf-8')
def __unicode__(self):
return self.index(1).__unicode__()
def __repr__(self):
return "CDTOC_Track(%s, %s, %s)" % \
(repr(self.__number__),
repr(self.__indexes__),
repr(self.__is_audio__))
def number(self):
"""return SheetTrack's number, starting from 1"""
return self.__number__
def get_metadata(self):
"""returns SheetTrack's MetaData, or None"""
return None
def filename(self):
"""returns SheetTrack's filename as unicode"""
return u"CDImage.wav"
def is_audio(self):
"""returns whether SheetTrack contains audio data"""
return self.__is_audio__
def pre_emphasis(self):
"""returns whether SheetTrack has pre-emphasis"""
return False
def copy_permitted(self):
"""returns whether copying is permitted"""
return False
class CDTOC_Index(SheetIndex):
def __init__(self, number, address):
self.__number__ = number
self.__address__ = address
if PY3:
def __str__(self):
return self.__unicode__()
else:
def __str__(self):
return self.__unicode__().encode('utf-8')
def __unicode__(self):
return u"%X" % (self.__address__)
def __repr__(self):
return "CDTOC_Index(number=%s, address=%s)" % \
(repr(self.__number__), repr(self.__address__))
def number(self):
return self.__number__
def offset(self):
from fractions import Fraction
return Fraction(self.__address__ - 150, 75)
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