b6fb7e8a86
Whipper is now fully PEP8 compliant. Revised version which includes all the changes suggested by Freso.
870 lines
27 KiB
Python
870 lines
27 KiB
Python
# -*- Mode: Python; test-case-name: whipper.test.test_image_table -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# Copyright (C) 2009 Thomas Vander Stichele
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# This file is part of whipper.
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#
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# whipper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# whipper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with whipper. If not, see <http://www.gnu.org/licenses/>.
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"""
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Wrap Table of Contents.
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"""
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import copy
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import urllib
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import urlparse
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import whipper
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from whipper.common import common
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import logging
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logger = logging.getLogger(__name__)
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# FIXME: taken from libcdio, but no reference found for these
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CDTEXT_FIELDS = [
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'ARRANGER',
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'COMPOSER',
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'DISCID',
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'GENRE',
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'MESSAGE',
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'ISRC',
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'PERFORMER',
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'SIZE_INFO',
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'SONGWRITER',
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'TITLE',
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'TOC_INFO',
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'TOC_INFO2',
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'UPC_EAN',
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]
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class Track:
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"""
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I represent a track entry in an Table.
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@ivar number: track number (1-based)
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@type number: int
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@ivar audio: whether the track is audio
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@type audio: bool
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@type indexes: dict of number -> L{Index}
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@ivar isrc: ISRC code (12 alphanumeric characters)
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@type isrc: str
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@ivar cdtext: dictionary of CD Text information; see L{CDTEXT_KEYS}.
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@type cdtext: str -> unicode
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@ivar pre_emphasis: whether track is pre-emphasised
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@type pre_emphasis: bool
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"""
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number = None
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audio = None
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indexes = None
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isrc = None
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cdtext = None
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session = None
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pre_emphasis = None
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def __repr__(self):
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return '<Track %02d>' % self.number
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def __init__(self, number, audio=True, session=None):
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self.number = number
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self.audio = audio
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self.indexes = {}
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self.cdtext = {}
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def index(self, number, absolute=None, path=None, relative=None,
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counter=None):
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"""
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@type path: unicode or None
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"""
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if path is not None:
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assert type(path) is unicode, "%r is not unicode" % path
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i = Index(number, absolute, path, relative, counter)
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self.indexes[number] = i
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def getIndex(self, number):
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return self.indexes[number]
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def getFirstIndex(self):
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"""
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Get the first chronological index for this track.
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Typically this is INDEX 01; but it could be INDEX 00 if there's
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a pre-gap.
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"""
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indexes = self.indexes.keys()
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indexes.sort()
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return self.indexes[indexes[0]]
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def getLastIndex(self):
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indexes = self.indexes.keys()
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indexes.sort()
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return self.indexes[indexes[-1]]
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def getPregap(self):
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"""
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Returns the length of the pregap for this track.
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The pregap is 0 if there is no index 0, and the difference between
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index 1 and index 0 if there is.
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"""
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if 0 not in self.indexes:
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return 0
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return self.indexes[1].absolute - self.indexes[0].absolute
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class Index:
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"""
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@ivar counter: counter for the index source; distinguishes between
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the matching FILE lines in .cue files for example
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@type path: unicode or None
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"""
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number = None
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absolute = None
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path = None
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relative = None
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counter = None
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def __init__(self, number, absolute=None, path=None, relative=None,
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counter=None):
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if path is not None:
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assert type(path) is unicode, "%r is not unicode" % path
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self.number = number
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self.absolute = absolute
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self.path = path
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self.relative = relative
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self.counter = counter
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def __repr__(self):
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return '<Index %02d absolute %r path %r relative %r counter %r>' % (
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self.number, self.absolute, self.path, self.relative, self.counter)
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class Table(object):
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"""
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I represent a table of indexes on a CD.
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@ivar tracks: tracks on this CD
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@type tracks: list of L{Track}
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@ivar catalog: catalog number
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@type catalog: str
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@type cdtext: dict of str -> str
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"""
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tracks = None # list of Track
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leadout = None # offset where the leadout starts
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catalog = None # catalog number; FIXME: is this UPC ?
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cdtext = None
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mbdiscid = None
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classVersion = 4
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def __init__(self, tracks=None):
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if not tracks:
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tracks = []
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self.tracks = tracks
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self.cdtext = {}
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# done this way because just having a class-defined instance var
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# gets overridden when unpickling
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self.instanceVersion = self.classVersion
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self.unpickled()
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def unpickled(self):
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self.logName = "Table 0x%08x v%d" % (id(self), self.instanceVersion)
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logger.debug('set logName')
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def getTrackStart(self, number):
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"""
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@param number: the track number, 1-based
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@type number: int
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@returns: the start of the given track number's index 1, in CD frames
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@rtype: int
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"""
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track = self.tracks[number - 1]
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return track.getIndex(1).absolute
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def getTrackEnd(self, number):
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"""
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@param number: the track number, 1-based
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@type number: int
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@returns: the end of the given track number (ie index 1 of next track)
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@rtype: int
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"""
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# default to end of disc
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end = self.leadout - 1
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# if not last track, calculate it from the next track
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if number < len(self.tracks):
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end = self.tracks[number].getIndex(1).absolute - 1
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# if on a session border, subtract the session leadin
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thisTrack = self.tracks[number - 1]
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nextTrack = self.tracks[number]
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if nextTrack.session > thisTrack.session:
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gap = self._getSessionGap(nextTrack.session)
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end -= gap
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return end
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def getTrackLength(self, number):
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"""
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@param number: the track number, 1-based
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@type number: int
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@returns: the length of the given track number, in CD frames
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@rtype: int
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"""
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return self.getTrackEnd(number) - self.getTrackStart(number) + 1
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def getAudioTracks(self):
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"""
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@returns: the number of audio tracks on the CD
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@rtype: int
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"""
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return len([t for t in self.tracks if t.audio])
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def hasDataTracks(self):
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"""
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@returns: whether this disc contains data tracks
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"""
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return len([t for t in self.tracks if not t.audio]) > 0
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def _cddbSum(self, i):
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ret = 0
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while i > 0:
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ret += (i % 10)
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i /= 10
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return ret
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def getCDDBValues(self):
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"""
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Get all CDDB values needed to calculate disc id and lookup URL.
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This includes:
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- CDDB disc id
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- number of audio tracks
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- offset of index 1 of each track
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- length of disc in seconds (including data track)
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@rtype: list of int
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"""
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result = []
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result.append(self.getAudioTracks())
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# cddb disc id takes into account data tracks
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# last byte is the number of tracks on the CD
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n = 0
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# CD's have a standard lead-in time of 2 seconds
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# which gets added for CDDB disc id's
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delta = 2 * common.FRAMES_PER_SECOND
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debug = [str(len(self.tracks))]
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for track in self.tracks:
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offset = self.getTrackStart(track.number) + delta
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result.append(offset)
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debug.append(str(offset))
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seconds = offset / common.FRAMES_PER_SECOND
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n += self._cddbSum(seconds)
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# the 'real' leadout, not offset by 150 frames
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last = self.tracks[-1]
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leadout = self.getTrackEnd(last.number) + 1
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logger.debug('leadout LBA: %d', leadout)
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# FIXME: we can't replace these calculations with the getFrameLength
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# call because the start and leadout in the algorithm get rounded
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# before making the difference
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startSeconds = self.getTrackStart(1) / common.FRAMES_PER_SECOND
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leadoutSeconds = leadout / common.FRAMES_PER_SECOND
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t = leadoutSeconds - startSeconds
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# durationFrames = self.getFrameLength(data=True)
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# duration = durationFrames / common.FRAMES_PER_SECOND
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# assert t == duration, "%r != %r" % (t, duration)
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debug.append(str(leadoutSeconds + 2)) # 2 is the 150 frame cddb offset
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result.append(leadoutSeconds)
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value = (n % 0xff) << 24 | t << 8 | len(self.tracks)
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result.insert(0, value)
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# compare this debug line to cd-discid output
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logger.debug('cddb values: %r', result)
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logger.debug('cddb disc id debug: %s',
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" ".join(["%08x" % value, ] + debug))
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return result
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def getCDDBDiscId(self):
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"""
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Calculate the CDDB disc ID.
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@rtype: str
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@returns: the 8-character hexadecimal disc ID
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"""
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values = self.getCDDBValues()
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return "%08x" % values[0]
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def getMusicBrainzDiscId(self):
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"""
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Calculate the MusicBrainz disc ID.
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@rtype: str
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@returns: the 28-character base64-encoded disc ID
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"""
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if self.mbdiscid:
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logger.debug('getMusicBrainzDiscId: returning cached %r'
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% self.mbdiscid)
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return self.mbdiscid
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values = self._getMusicBrainzValues()
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# MusicBrainz disc id does not take into account data tracks
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# P2.3
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try:
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import hashlib
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sha1 = hashlib.sha1
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except ImportError:
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from sha import sha as sha1
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import base64
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sha = sha1()
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# number of first track
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sha.update("%02X" % values[0])
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# number of last track
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sha.update("%02X" % values[1])
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sha.update("%08X" % values[2])
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# offsets of tracks
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for i in range(1, 100):
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try:
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offset = values[2 + i]
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except IndexError:
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offset = 0
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sha.update("%08X" % offset)
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digest = sha.digest()
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assert len(digest) == 20, \
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"digest should be 20 chars, not %d" % len(digest)
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# The RFC822 spec uses +, /, and = characters, all of which are special
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# HTTP/URL characters. To avoid the problems with dealing with that, I
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# (Rob) used ., _, and -
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# base64 altchars specify replacements for + and /
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result = base64.b64encode(digest, '._')
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# now replace =
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result = "-".join(result.split("="))
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assert len(result) == 28, \
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"Result should be 28 characters, not %d" % len(result)
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logger.debug('getMusicBrainzDiscId: returning %r' % result)
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self.mbdiscid = result
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return result
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def getMusicBrainzSubmitURL(self):
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host = 'musicbrainz.org'
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discid = self.getMusicBrainzDiscId()
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values = self._getMusicBrainzValues()
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query = urllib.urlencode({
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'id': discid,
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'toc': ' '.join([str(v) for v in values]),
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'tracks': self.getAudioTracks(),
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})
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return urlparse.urlunparse((
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'https', host, '/cdtoc/attach', '', query, ''))
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def getFrameLength(self, data=False):
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"""
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Get the length in frames (excluding HTOA)
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@param data: whether to include the data tracks in the length
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"""
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# the 'real' leadout, not offset by 150 frames
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if data:
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last = self.tracks[-1]
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else:
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last = self.tracks[self.getAudioTracks() - 1]
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leadout = self.getTrackEnd(last.number) + 1
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logger.debug('leadout LBA: %d', leadout)
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durationFrames = leadout - self.getTrackStart(1)
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return durationFrames
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def duration(self):
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"""
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Get the duration in ms for all audio tracks (excluding HTOA).
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"""
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return int(self.getFrameLength() * 1000.0 / common.FRAMES_PER_SECOND)
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def _getMusicBrainzValues(self):
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"""
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Get all MusicBrainz values needed to calculate disc id and submit URL.
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This includes:
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- track number of first track
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- number of audio tracks
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- leadout of disc
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- offset of index 1 of each track
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@rtype: list of int
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"""
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# MusicBrainz disc id does not take into account data tracks
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result = []
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# number of first track
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result.append(1)
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# number of last audio track
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result.append(self.getAudioTracks())
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leadout = self.leadout
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# if the disc is multi-session, last track is the data track,
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# and we should subtract 11250 + 150 from the last track's offset
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# for the leadout
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if self.hasDataTracks():
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assert not self.tracks[-1].audio
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leadout = self.tracks[-1].getIndex(1).absolute - 11250 - 150
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# treat leadout offset as track 0 offset
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result.append(150 + leadout)
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# offsets of tracks
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for i in range(1, 100):
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try:
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track = self.tracks[i - 1]
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if not track.audio:
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continue
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offset = track.getIndex(1).absolute + 150
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result.append(offset)
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except IndexError:
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pass
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logger.debug('MusicBrainz values: %r', result)
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return result
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def getAccurateRipIds(self):
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"""
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Calculate the two AccurateRip ID's.
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@returns: the two 8-character hexadecimal disc ID's
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@rtype: tuple of (str, str)
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"""
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# AccurateRip does not take into account data tracks,
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# but does count the data track to determine the leadout offset
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discId1 = 0
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discId2 = 0
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for track in self.tracks:
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if not track.audio:
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continue
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offset = self.getTrackStart(track.number)
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discId1 += offset
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discId2 += (offset or 1) * track.number
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# also add end values, where leadout offset is one past the end
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# of the last track
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last = self.tracks[-1]
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offset = self.getTrackEnd(last.number) + 1
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discId1 += offset
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discId2 += offset * (self.getAudioTracks() + 1)
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discId1 &= 0xffffffff
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discId2 &= 0xffffffff
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return ("%08x" % discId1, "%08x" % discId2)
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def getAccurateRipURL(self):
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"""
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Return the full AccurateRip URL.
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@returns: the AccurateRip URL
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@rtype: str
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"""
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discId1, discId2 = self.getAccurateRipIds()
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return "http://www.accuraterip.com/accuraterip/" \
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"%s/%s/%s/dBAR-%.3d-%s-%s-%s.bin" % (
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discId1[-1], discId1[-2], discId1[-3],
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self.getAudioTracks(), discId1, discId2, self.getCDDBDiscId())
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def cue(self, cuePath='', program='whipper'):
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"""
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@param cuePath: path to the cue file to be written. If empty,
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will treat paths as if in current directory.
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Dump our internal representation to a .cue file content.
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@rtype: C{unicode}
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"""
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logger.debug('generating .cue for cuePath %r', cuePath)
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lines = []
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def writeFile(path):
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targetPath = common.getRelativePath(path, cuePath)
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line = 'FILE "%s" WAVE' % targetPath
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lines.append(line)
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logger.debug('writeFile: %r' % line)
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# header
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main = ['PERFORMER', 'TITLE']
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for key in CDTEXT_FIELDS:
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if key not in main and key in self.cdtext:
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lines.append(" %s %s" % (key, self.cdtext[key]))
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assert self.hasTOC(), "Table does not represent a full CD TOC"
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lines.append('REM DISCID %s' % self.getCDDBDiscId().upper())
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lines.append('REM COMMENT "%s %s"' % (program, whipper.__version__))
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if self.catalog:
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lines.append("CATALOG %s" % self.catalog)
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for key in main:
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if key in self.cdtext:
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lines.append('%s "%s"' % (key, self.cdtext[key]))
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# FIXME:
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# - the first FILE statement goes before the first TRACK, even if
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# there is a non-file-using PREGAP
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# - the following FILE statements come after the last INDEX that
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# use that FILE; so before a next TRACK, PREGAP silence, ...
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# add the first FILE line; EAC always puts the first FILE
|
|
# statement before TRACK 01 and any possible PRE-GAP
|
|
firstTrack = self.tracks[0]
|
|
index = firstTrack.getFirstIndex()
|
|
indexOne = firstTrack.getIndex(1)
|
|
counter = index.counter
|
|
track = firstTrack
|
|
|
|
while not index.path:
|
|
t, i = self.getNextTrackIndex(track.number, index.number)
|
|
track = self.tracks[t - 1]
|
|
index = track.getIndex(i)
|
|
counter = index.counter
|
|
|
|
if index.path:
|
|
logger.debug('counter %d, writeFile' % counter)
|
|
writeFile(index.path)
|
|
|
|
for i, track in enumerate(self.tracks):
|
|
logger.debug('track i %r, track %r' % (i, track))
|
|
# FIXME: skip data tracks for now
|
|
if not track.audio:
|
|
continue
|
|
|
|
indexes = track.indexes.keys()
|
|
indexes.sort()
|
|
|
|
wroteTrack = False
|
|
|
|
for number in indexes:
|
|
index = track.indexes[number]
|
|
logger.debug('index %r, %r' % (number, index))
|
|
|
|
# any time the source counter changes to a higher value,
|
|
# write a FILE statement
|
|
# it has to be higher, because we can run into the HTOA
|
|
# at counter 0 here
|
|
if index.counter > counter:
|
|
if index.path:
|
|
logger.debug('counter %d, writeFile' % counter)
|
|
writeFile(index.path)
|
|
logger.debug('setting counter to index.counter %r' %
|
|
index.counter)
|
|
counter = index.counter
|
|
|
|
# any time we hit the first index, write a TRACK statement
|
|
if not wroteTrack:
|
|
wroteTrack = True
|
|
line = " TRACK %02d %s" % (i + 1, 'AUDIO')
|
|
lines.append(line)
|
|
logger.debug('%r' % line)
|
|
|
|
for key in CDTEXT_FIELDS:
|
|
if key in track.cdtext:
|
|
lines.append(' %s "%s"' % (
|
|
key, track.cdtext[key]))
|
|
|
|
if track.isrc is not None:
|
|
lines.append(" ISRC %s" % track.isrc)
|
|
|
|
if track.pre_emphasis is not None:
|
|
lines.append(" FLAGS PRE")
|
|
|
|
# handle TRACK 01 INDEX 00 specially
|
|
if 0 in indexes:
|
|
index00 = track.indexes[0]
|
|
if i == 0:
|
|
# if we have a silent pre-gap, output it
|
|
if not index00.path:
|
|
length = indexOne.absolute - index00.absolute
|
|
lines.append(" PREGAP %s" %
|
|
common.framesToMSF(length))
|
|
continue
|
|
|
|
# handle any other INDEX 00 after its TRACK
|
|
lines.append(" INDEX "
|
|
"%02d %s" % (0, common.framesToMSF(
|
|
index00.relative)))
|
|
|
|
if number > 0:
|
|
# index 00 is output after TRACK up above
|
|
lines.append(" INDEX %02d %s" % (number,
|
|
common.framesToMSF(
|
|
index.relative)))
|
|
|
|
lines.append("")
|
|
|
|
return "\n".join(lines)
|
|
|
|
# methods that modify the table
|
|
|
|
def clearFiles(self):
|
|
"""
|
|
Clear all file backings.
|
|
Resets indexes paths and relative offsets.
|
|
"""
|
|
# FIXME: do a loop over track indexes better, with a pythonic
|
|
# construct that allows you to do for t, i in ...
|
|
t = self.tracks[0].number
|
|
index = self.tracks[0].getFirstIndex()
|
|
i = index.number
|
|
|
|
logger.debug('clearing path')
|
|
while True:
|
|
track = self.tracks[t - 1]
|
|
index = track.getIndex(i)
|
|
logger.debug('Clearing path on track %d, index %d', t, i)
|
|
index.path = None
|
|
index.relative = None
|
|
try:
|
|
t, i = self.getNextTrackIndex(t, i)
|
|
except IndexError:
|
|
break
|
|
|
|
def setFile(self, track, index, path, length, counter=None):
|
|
"""
|
|
Sets the given file as the source from the given index on.
|
|
Will loop over all indexes that fall within the given length,
|
|
to adjust the path.
|
|
|
|
Assumes all indexes have an absolute offset and will raise if not.
|
|
|
|
@type track: C{int}
|
|
@type index: C{int}
|
|
"""
|
|
logger.debug('setFile: track %d, index %d, path %r, '
|
|
'length %r, counter %r', track, index, path, length,
|
|
counter)
|
|
|
|
t = self.tracks[track - 1]
|
|
i = t.indexes[index]
|
|
start = i.absolute
|
|
assert start is not None, "index %r is missing absolute offset" % i
|
|
end = start + length - 1 # last sector that should come from this file
|
|
|
|
# FIXME: check border conditions here, esp. wrt. toc's off-by-one bug
|
|
while i.absolute <= end:
|
|
i.path = path
|
|
i.relative = i.absolute - start
|
|
i.counter = counter
|
|
logger.debug('Setting path %r, relative %r on '
|
|
'track %d, index %d, counter %r',
|
|
path, i.relative, track, index, counter)
|
|
try:
|
|
track, index = self.getNextTrackIndex(track, index)
|
|
t = self.tracks[track - 1]
|
|
i = t.indexes[index]
|
|
except IndexError:
|
|
break
|
|
|
|
def absolutize(self):
|
|
"""
|
|
Calculate absolute offsets on indexes as much as possible.
|
|
Only possible for as long as tracks draw from the same file.
|
|
"""
|
|
t = self.tracks[0].number
|
|
index = self.tracks[0].getFirstIndex()
|
|
i = index.number
|
|
# the first cut is the deepest
|
|
counter = index.counter
|
|
|
|
logger.debug('absolutizing')
|
|
while True:
|
|
track = self.tracks[t - 1]
|
|
index = track.getIndex(i)
|
|
assert track.number == t
|
|
assert index.number == i
|
|
if index.counter is None:
|
|
logger.debug('Track %d, index %d has no counter', t, i)
|
|
break
|
|
if index.counter != counter:
|
|
logger.debug(
|
|
'Track %d, index %d has a different counter', t, i)
|
|
break
|
|
logger.debug('Setting absolute offset %d on track %d, index %d',
|
|
index.relative, t, i)
|
|
if index.absolute is not None:
|
|
if index.absolute != index.relative:
|
|
msg = 'Track %d, index %d had absolute %d,' \
|
|
' overriding with %d' % (
|
|
t, i, index.absolute, index.relative)
|
|
raise ValueError(msg)
|
|
index.absolute = index.relative
|
|
try:
|
|
t, i = self.getNextTrackIndex(t, i)
|
|
except IndexError:
|
|
break
|
|
|
|
def merge(self, other, session=2):
|
|
"""
|
|
Merges the given table at the end.
|
|
The other table is assumed to be from an additional session,
|
|
|
|
|
|
@type other: L{Table}
|
|
"""
|
|
gap = self._getSessionGap(session)
|
|
|
|
trackCount = len(self.tracks)
|
|
sourceCounter = self.tracks[-1].getLastIndex().counter
|
|
|
|
for track in other.tracks:
|
|
t = copy.deepcopy(track)
|
|
t.number = track.number + trackCount
|
|
t.session = session
|
|
for i in t.indexes.values():
|
|
if i.absolute is not None:
|
|
i.absolute += self.leadout + gap
|
|
logger.debug('Fixing track %02d, index %02d, '
|
|
'absolute %d' % (
|
|
t.number, i.number, i.absolute))
|
|
if i.counter is not None:
|
|
i.counter += sourceCounter
|
|
logger.debug('Fixing track %02d, index %02d, '
|
|
'counter %d' % (
|
|
t.number, i.number, i.counter))
|
|
self.tracks.append(t)
|
|
|
|
self.leadout += other.leadout + gap # FIXME
|
|
logger.debug('Fixing leadout, now %d', self.leadout)
|
|
|
|
def _getSessionGap(self, session):
|
|
# From cdrecord multi-session info:
|
|
# For the first additional session this is 11250 sectors
|
|
# lead-out/lead-in overhead + 150 sectors for the pre-gap of the first
|
|
# track after the lead-in = 11400 sectos.
|
|
|
|
# For all further session this is 6750 sectors lead-out/lead-in
|
|
# overhead + 150 sectors for the pre-gap of the first track after the
|
|
# lead-in = 6900 sectors.
|
|
|
|
gap = 11400
|
|
if session > 2:
|
|
gap = 6900
|
|
return gap
|
|
|
|
# lookups
|
|
|
|
def getNextTrackIndex(self, track, index):
|
|
"""
|
|
Return the next track and index.
|
|
|
|
@param track: track number, 1-based
|
|
|
|
@raises IndexError: on last index
|
|
|
|
@rtype: tuple of (int, int)
|
|
"""
|
|
t = self.tracks[track - 1]
|
|
indexes = t.indexes.keys()
|
|
position = indexes.index(index)
|
|
|
|
if position + 1 < len(indexes):
|
|
return track, indexes[position + 1]
|
|
|
|
track += 1
|
|
if track > len(self.tracks):
|
|
raise IndexError("No index beyond track %d, index %d" % (
|
|
track - 1, index))
|
|
|
|
t = self.tracks[track - 1]
|
|
indexes = t.indexes.keys()
|
|
|
|
return track, indexes[0]
|
|
|
|
# various tests for types of Table
|
|
|
|
def hasTOC(self):
|
|
"""
|
|
Check if the Table has a complete TOC.
|
|
a TOC is a list of all tracks and their Index 01, with absolute
|
|
offsets, as well as the leadout.
|
|
"""
|
|
if not self.leadout:
|
|
logger.debug('no leadout, no TOC')
|
|
return False
|
|
|
|
for t in self.tracks:
|
|
if 1 not in t.indexes.keys():
|
|
logger.debug('no index 1, no TOC')
|
|
return False
|
|
if t.indexes[1].absolute is None:
|
|
logger.debug('no absolute index 1, no TOC')
|
|
return False
|
|
|
|
return True
|
|
|
|
def canCue(self):
|
|
"""
|
|
Check if this table can be used to generate a .cue file
|
|
"""
|
|
if not self.hasTOC():
|
|
logger.debug('No TOC, cannot cue')
|
|
return False
|
|
|
|
for t in self.tracks:
|
|
for i in t.indexes.values():
|
|
if i.relative is None:
|
|
logger.debug('Track %02d, Index %02d does not '
|
|
'have relative', t.number, i.number)
|
|
return False
|
|
|
|
return True
|