02edffa629
* morituri/image/toc.py (added): Add an abstraction for a TOC. Take data tracks into account correctly for CDDB and AccurateRip disc ID's.
134 lines
3.8 KiB
Python
134 lines
3.8 KiB
Python
# -*- Mode: Python; test-case-name: morituri.test.test_image_toc -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# Morituri - for those about to RIP
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# Copyright (C) 2009 Thomas Vander Stichele
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# This file is part of morituri.
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#
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# morituri 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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# morituri 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 morituri. 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 os
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import struct
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import gst
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from morituri.common import task, crc
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from morituri.image import cue
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class Track:
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number = None # track number, 1-based
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start = None # start of track in CD frames, 0-based
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end = None # end of track in CD frames, 0-based
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audio = True
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def __init__(self, number, start, end, audio=True):
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self.number = number
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self.start = start
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self.end = end
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self.audio = audio
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class TOC:
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tracks = None # list of Track
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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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def getTrackStart(self, number):
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return self.tracks[number - 1].start
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def getTrackEnd(self, number):
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return self.tracks[number - 1].end
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def getTrackLength(self, number):
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track = self.tracks[number - 1]
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return track.end - track.start + 1
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def getAudioTracks(self):
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return len([t for t in self.tracks if t.audio])
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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 getCDDBDiscId(self):
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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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for track in self.tracks:
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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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offset = self.getTrackStart(track.number) + \
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2 * crc.DISC_FRAMES_PER_SECOND
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seconds = offset / crc.DISC_FRAMES_PER_SECOND
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n += self._cddbSum(seconds)
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last = self.tracks[-1]
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leadout = self.getTrackEnd(last.number)
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frameLength = leadout - self.getTrackStart(1)
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t = frameLength / crc.DISC_FRAMES_PER_SECOND
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value = (n % 0xff) << 24 | t << 8 | len(self.tracks)
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return "%08x" % value
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def getAccurateRipIds(self):
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"""
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@rtype: two-tuple of (str, str)
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"""
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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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# does not count data tracks
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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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len(self.tracks), discId1, discId2, self.getCDDBDiscId())
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