3b1bd242d0
This commit also includes: - whitespace / code formatting fixes - slight syntax related changes: except <exception_name>, e -> except <exception_name> as e - 3 pointless instructions instances have been rewritten [sorted] (spotted by semi-automatic check) The unrelated changes shouldn't have any real impact on whipper's behaviour.
236 lines
7.3 KiB
Python
236 lines
7.3 KiB
Python
# -*- Mode: Python; test-case-name: whipper.test.test_image_image -*-
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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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import os
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from whipper.common import encode
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from whipper.common import common
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from whipper.image import cue, table
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from whipper.extern.task import task
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from whipper.program.soxi import AudioLengthTask
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import logging
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logger = logging.getLogger(__name__)
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class Image(object):
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"""Wrap on-disk CD images based on the .cue file.
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:ivar path: .cue path.
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:vartype path: unicode
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:ivar cue:
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:vartype cue:
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:ivar offsets:
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:vartype offsets:
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:ivar lengths:
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:vartype lengths:
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:ivar table: the Table of Contents for this image.
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:vartype table: L{table.Table}
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"""
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logCategory = 'Image'
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def __init__(self, path):
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assert type(path) is unicode, "%r is not unicode" % path
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self._path = path
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self.cue = cue.CueFile(path)
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self.cue.parse()
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self._offsets = [] # 0 .. trackCount - 1
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self._lengths = [] # 0 .. trackCount - 1
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self.table = None
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def getRealPath(self, path):
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"""Translate the .cue's FILE to an existing path.
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:param path: .cue path.
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:type path:
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"""
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assert type(path) is unicode, "%r is not unicode" % path
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return self.cue.getRealPath(path)
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def setup(self, runner):
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"""Do initial setup.
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Like figuring out track lengths and constructing the Table of Contents.
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:param runner:
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:type runner:
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"""
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logger.debug('setup image start')
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verify = ImageVerifyTask(self)
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logger.debug('verifying image')
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runner.run(verify)
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logger.debug('verified image')
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# calculate offset and length for each track
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# CD's have a standard lead-in time of 2 seconds;
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# checksums that use it should add it there
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if 0 in verify.lengths:
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offset = verify.lengths[0]
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else:
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offset = self.cue.table.tracks[0].getIndex(1).relative
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tracks = []
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for i in range(len(self.cue.table.tracks)):
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length = self.cue.getTrackLength(self.cue.table.tracks[i])
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if length == -1:
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length = verify.lengths[i + 1]
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t = table.Track(i + 1, audio=True)
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tracks.append(t)
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# FIXME: this probably only works for non-compliant .CUE files
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# where pregap is put at end of previous file
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t.index(1, absolute=offset,
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path=self.cue.table.tracks[i].getIndex(1).path,
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relative=0)
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offset += length
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self.table = table.Table(tracks)
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self.table.leadout = offset
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logger.debug('setup image done')
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class ImageVerifyTask(task.MultiSeparateTask):
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"""I verify a disk image and get the necessary track lengths.
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:cvar logCategory:
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:vartype logCategory:
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:cvar description:
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:vartype description:
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:cvar lengths:
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:vartype lengths:
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:ivar image:
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:vartype image:
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:ivar tasks:
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:vartype tasks:
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"""
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logCategory = 'ImageVerifyTask'
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description = "Checking tracks"
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lengths = None
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def __init__(self, image):
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task.MultiSeparateTask.__init__(self)
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self._image = image
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cue = image.cue
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self._tasks = []
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self.lengths = {}
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try:
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htoa = cue.table.tracks[0].indexes[0]
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track = cue.table.tracks[0]
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path = image.getRealPath(htoa.path)
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assert type(path) is unicode, "%r is not unicode" % path
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logger.debug('schedule scan of audio length of %r', path)
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taskk = AudioLengthTask(path)
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self.addTask(taskk)
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self._tasks.append((0, track, taskk))
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except (KeyError, IndexError):
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logger.debug('no htoa track')
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for trackIndex, track in enumerate(cue.table.tracks):
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logger.debug('verifying track %d', trackIndex + 1)
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index = track.indexes[1]
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length = cue.getTrackLength(track)
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if length == -1:
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path = image.getRealPath(index.path)
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assert type(path) is unicode, "%r is not unicode" % path
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logger.debug('schedule scan of audio length of %r', path)
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taskk = AudioLengthTask(path)
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self.addTask(taskk)
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self._tasks.append((trackIndex + 1, track, taskk))
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else:
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logger.debug('track %d has length %d', trackIndex + 1, length)
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def stop(self):
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for trackIndex, track, taskk in self._tasks:
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if taskk.exception:
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logger.debug('subtask %r had exception %r, shutting down' % (
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taskk, taskk.exception))
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self.setException(taskk.exception)
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break
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if taskk.length is None:
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raise ValueError("Track length was not found; "
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"look for earlier errors "
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"in debug log (set RIP_DEBUG=4)")
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index = track.indexes[1]
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assert taskk.length % common.SAMPLES_PER_FRAME == 0
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end = taskk.length / common.SAMPLES_PER_FRAME
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self.lengths[trackIndex] = end - index.relative
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task.MultiSeparateTask.stop(self)
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class ImageEncodeTask(task.MultiSeparateTask):
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"""I encode a disk image to a different format.
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:ivar image:
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:vartype image:
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:ivar tasks:
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:vartype tasks:
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:ivar lengths:
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:vartype lengths:
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"""
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description = "Encoding tracks"
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def __init__(self, image, outdir):
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task.MultiSeparateTask.__init__(self)
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self._image = image
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cue = image.cue
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self._tasks = []
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self.lengths = {}
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def add(index):
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path = image.getRealPath(index.path)
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assert type(path) is unicode, "%r is not unicode" % path
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logger.debug('schedule encode of %r', path)
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root, ext = os.path.splitext(os.path.basename(path))
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outpath = os.path.join(outdir, root + '.' + 'flac')
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logger.debug('schedule encode to %r', outpath)
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taskk = encode.FlacEncodeTask(path,
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os.path.join(outdir,
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root + '.' + 'flac'))
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self.addTask(taskk)
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try:
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htoa = cue.table.tracks[0].indexes[0]
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logger.debug('encoding htoa track')
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add(htoa)
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except (KeyError, IndexError):
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logger.debug('no htoa track')
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pass
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for trackIndex, track in enumerate(cue.table.tracks):
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logger.debug('encoding track %d', trackIndex + 1)
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index = track.indexes[1]
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add(index)
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