259 lines
8.8 KiB
Python
259 lines
8.8 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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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, log
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from morituri.image import table
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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, log.Loggable):
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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.table = table.IndexTable()
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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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counter = 0
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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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# set index 1 of previous track if there was one, using
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# pregapLength if applicable
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if currentTrack:
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currentTrack.index(1, path=currentFile.path,
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relative=currentOffset + pregapLength, counter=counter)
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self.debug('track %d, added index %r',
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currentTrack.number, currentTrack.getIndex(1))
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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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pregapLength = 0
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# FIXME: track mode
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currentTrack = table.ITTrack(trackNumber)
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self.table.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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if currentFile is not None:
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self.debug('SILENCE after FILE, increasing counter')
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counter += 1
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currentFile = None
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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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self.debug('FILE %s, start %r, length %r',
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filePath, common.msfToFrames(start),
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common.msfToFrames(length))
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if not currentFile or filePath != currentFile.path:
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counter += 1
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self.debug('track %d, switched to new FILE, increased counter to %d',
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trackNumber, counter)
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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, path=currentFile.path,
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relative=currentOffset, counter=counter)
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self.debug('track %d, added index %r',
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currentTrack.number, currentTrack.getIndex(0))
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# store the pregapLength to add it when we index 1 for this
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# track on the next iteration
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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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print 'ouch'
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continue
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indexNumber += 1
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offset = common.msfToFrames(m.group('offset'))
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currentTrack.index(indexNumber, path=currentFile.path,
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relative=offset, counter=counter)
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self.debug('track %d, added index %r',
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currentTrack.number, currentTrack.getIndex(indexNumber))
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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, path=currentFile.path,
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relative=currentOffset + pregapLength, counter=counter)
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self.debug('track %d, added index %r',
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currentTrack.number, currentTrack.getIndex(1))
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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.table.tracks.index(track)
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if i == len(self.table.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.table.tracks[i + 1].indexes[1] # FIXME: could be 0
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c = thisIndex.counter
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if c is not None and c == nextIndex.counter:
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# they belong to the same source, so their relative delta is length
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return nextIndex.relative - thisIndex.relative
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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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