c17a28d7ae
* examples/readcue.py: * morituri/image/cue.py: * morituri/image/image.py: * morituri/image/toc.py: * morituri/program/cdrdao.py: * morituri/test/test_image_cue.py: * morituri/test/test_image_toc.py: Cue -> CueFile TOC -> TocFile
272 lines
8.3 KiB
Python
272 lines
8.3 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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Reading .toc files
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"""
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import os
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import re
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from morituri.common import common
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# header
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_CATALOG_RE = re.compile(r'^CATALOG "(?P<catalog>\d+)"$')
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# records
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_TRACK_RE = re.compile(r"""
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^TRACK # TRACK
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\s(?P<mode>.+)$ # mode (AUDIO, MODEx/2xxx, ...)
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""", re.VERBOSE)
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# a HTOA is marked in the cdrdao's TOC as SILENCE
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_SILENCE_RE = re.compile(r"""
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^SILENCE # SILENCE
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\s(?P<length>.*)$ # pre-gap length
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""", re.VERBOSE)
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_FILE_RE = re.compile(r"""
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^FILE # FILE
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\s+"(?P<name>.*)" # 'file name' in quotes
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\s+(?P<start>.+) # start offset
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\s(?P<length>.+)$ # stop offset
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""", re.VERBOSE)
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# FIXME: start can be 0
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_START_RE = re.compile(r"""
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^START # START
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\s(?P<length>.*)$ # pre-gap length
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""", re.VERBOSE)
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_INDEX_RE = re.compile(r"""
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^INDEX # INDEX
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\s(?P<offset>.+)$ # start offset
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""", re.VERBOSE)
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class TocFile(object):
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def __init__(self, path):
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self._path = path
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self._messages = []
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self.tracks = []
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def parse(self):
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state = 'HEADER'
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currentFile = None
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currentTrack = None
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trackNumber = 0
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indexNumber = 0
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currentOffset = 0 # running absolute offset of where each track starts
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currentLength = 0 # accrued during TRACK record parsing, current track
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pregapLength = 0 # length of the pre-gap, current track
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# the first track's INDEX 1 can only be gotten from the .toc
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# file once the first pregap is calculated; so we add INDEX 1
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# at the end of each parsed TRACK record
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handle = open(self._path, 'r')
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for number, line in enumerate(handle.readlines()):
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line = line.rstrip()
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m = _CATALOG_RE.search(line)
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if m:
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catalog = m.group('catalog')
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# look for TRACK lines
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m = _TRACK_RE.search(line)
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if m:
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state = 'TRACK'
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# handle index 1 of previous track, if any
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if currentTrack:
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currentTrack.index(1, currentOffset + pregapLength,
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currentFile)
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trackNumber += 1
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currentOffset += currentLength
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currentLength = 0
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indexNumber = 1
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trackMode = m.group('mode')
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currentTrack = Track(trackNumber)
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self.tracks.append(currentTrack)
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continue
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# look for SILENCE lines
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m = _SILENCE_RE.search(line)
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if m:
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length = m.group('length')
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currentLength += common.msfToFrames(length)
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# look for FILE lines
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m = _FILE_RE.search(line)
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if m:
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filePath = m.group('name')
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start = m.group('start')
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length = m.group('length')
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currentFile = File(filePath, start, length)
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#currentOffset += common.msfToFrames(start)
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currentLength += common.msfToFrames(length)
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# look for START lines
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m = _START_RE.search(line)
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if m:
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if not currentTrack:
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self.message(number, 'START without preceding TRACK')
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print 'ouch'
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continue
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length = common.msfToFrames(m.group('length'))
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currentTrack.index(0, currentOffset, currentFile)
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currentLength += length
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pregapLength = length
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# look for INDEX lines
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m = _INDEX_RE.search(line)
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if m:
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if not currentTrack:
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self.message(number, 'INDEX without preceding TRACK')
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indexNumber += 1
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offset = common.msfToFrames(m.group('offset'))
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currentTrack.index(indexNumber, offset, currentFile)
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# handle index 1 of final track, if any
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if currentTrack:
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currentTrack.index(1, currentOffset + pregapLength, currentFile)
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def message(self, number, message):
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"""
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Add a message about a given line in the cue file.
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@param number: line number, counting from 0.
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"""
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self._messages.append((number + 1, message))
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def getTrackLength(self, track):
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# returns track length in frames, or -1 if can't be determined and
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# complete file should be assumed
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# FIXME: this assumes a track can only be in one file; is this true ?
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i = self.tracks.index(track)
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if i == len(self.tracks) - 1:
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# last track, so no length known
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return -1
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thisIndex = track._indexes[1] # FIXME: could be more
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nextIndex = self.tracks[i + 1]._indexes[1] # FIXME: could be 0
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if thisIndex[1] == nextIndex[1]: # same file
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return nextIndex[0] - thisIndex[0]
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# FIXME: more logic
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return -1
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def getRealPath(self, path):
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"""
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Translate the .cue's FILE to an existing path.
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"""
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if os.path.exists(path):
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return path
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# .cue FILE statements have Windows-style path separators, so convert
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tpath = os.path.join(*path.split('\\'))
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candidatePaths = []
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# if the path is relative:
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# - check relatively to the cue file
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# - check only the filename part relative to the cue file
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if tpath == os.path.abspath(tpath):
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candidatePaths.append(tPath)
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else:
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candidatePaths.append(os.path.join(
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os.path.dirname(self._path), tpath))
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candidatePaths.append(os.path.join(
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os.path.dirname(self._path), os.path.basename(tpath)))
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for candidate in candidatePaths:
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noext, _ = os.path.splitext(candidate)
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for ext in ['wav', 'flac']:
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cpath = '%s.%s' % (noext, ext)
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if os.path.exists(cpath):
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return cpath
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raise KeyError, "Cannot find file for %s" % path
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class File:
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"""
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I represent a FILE line in a .toc file.
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"""
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def __init__(self, path, start, length):
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self.path = path
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self.start = start
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self.length = length
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def __repr__(self):
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return '<File "%s">' % (self.path, )
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# FIXME: add type ? separate AUDIO from others
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class Track:
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"""
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I represent a track in a cue file.
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I have index points.
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Each index point is linked to an audio file.
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@ivar number: track number
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@type number: int
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"""
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def __init__(self, number):
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if number < 1 or number > 99:
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raise IndexError, "Track number must be from 1 to 99"
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self.number = number
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self._indexes = {} # index number -> (sector, File)
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self.title = None
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self.performer = None
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def __repr__(self):
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return '<Track %02d with %d indexes>' % (self.number,
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len(self._indexes.keys()))
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def index(self, number, sector, file):
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"""
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Add the given index to the current track.
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@type file: L{File}
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"""
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if number in self._indexes.keys():
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raise KeyError, "index %d already in track %d" % (
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number, self.number)
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if number < 0 or number > 99:
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raise IndexError, "Index number must be from 0 to 99"
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self._indexes[number] = (sector, file)
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def getIndex(self, number):
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"""
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@rtype: tuple of (int, File)
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"""
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return self._indexes[number]
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