f978907fcf
* morituri/image/cue.py: Add logCategory. * morituri/image/image.py: If subtasks had an exception, retrigger the exception and stop.
304 lines
9.7 KiB
Python
304 lines
9.7 KiB
Python
# -*- Mode: Python; test-case-name: morituri.test.test_image_image -*-
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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 on-disk CD images based on the .cue file.
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"""
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import os
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from morituri.common import task, log, common
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from morituri.image import cue, table
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class Image(object, log.Loggable):
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"""
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@ivar table: The Table of Contents for this image.
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@type 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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"""
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@type path: unicode
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@param path: .cue path
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"""
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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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"""
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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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"""
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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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"""
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Do initial setup, like figuring out track lengths, and
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constructing the Table of Contents.
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"""
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self.debug('setup image start')
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verify = ImageVerifyTask(self)
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self.debug('verifying image')
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runner.run(verify)
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self.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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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, 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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self.debug('setup image done')
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class AccurateRipChecksumTask(task.MultiSeparateTask):
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"""
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I calculate the AccurateRip checksums of all tracks.
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"""
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description = "Checksumming tracks"
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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.checksums = []
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self.debug('Checksumming %d tracks' % len(cue.table.tracks))
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for trackIndex, track in enumerate(cue.table.tracks):
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index = track.indexes[1]
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length = cue.getTrackLength(track)
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self.debug('track %d has length %d' % (trackIndex + 1, length))
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path = image.getRealPath(index.path)
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# here to avoid import gst eating our options
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from morituri.common import checksum
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checksumTask = checksum.AccurateRipChecksumTask(path,
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trackNumber=trackIndex + 1, trackCount=len(cue.table.tracks),
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frameStart=index.relative * common.SAMPLES_PER_FRAME,
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frameLength=length * common.SAMPLES_PER_FRAME)
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self.addTask(checksumTask)
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def stop(self):
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self.checksums = [t.checksum for t in self.tasks]
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task.MultiSeparateTask.stop(self)
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class AudioLengthTask(task.Task):
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"""
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I calculate the length of a track in audio frames.
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@ivar length: length of the decoded audio file, in audio frames.
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"""
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logCategory = 'AudioLengthTask'
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description = 'Getting length of audio track'
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length = None
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def __init__(self, path):
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"""
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@type path: unicode
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"""
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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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def start(self, runner):
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# here to avoid import gst eating our options
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import gst
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task.Task.start(self, runner)
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self._pipeline = gst.parse_launch('''
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filesrc location="%s" !
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decodebin ! audio/x-raw-int !
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fakesink name=sink''' %
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common.quoteParse(self._path).encode('utf-8'))
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self._bus = self._pipeline.get_bus()
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self._bus.add_signal_watch()
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self._bus.connect('message::error', self._error_cb)
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self.debug('pausing')
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self._pipeline.set_state(gst.STATE_PAUSED)
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self.debug('waiting for ASYNC_DONE or ERROR')
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message = self._bus.timed_pop_filtered(gst.CLOCK_TIME_NONE,
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gst.MESSAGE_ASYNC_DONE | gst.MESSAGE_ERROR)
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if message.type == gst.MESSAGE_ERROR:
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self._error_cb(self._bus, message)
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self._pipeline.set_state(gst.STATE_NULL)
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return
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self.debug('query duration')
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sink = self._pipeline.get_by_name('sink')
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assert sink, 'Error constructing pipeline'
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try:
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length, qformat = sink.query_duration(gst.FORMAT_DEFAULT)
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except gst.QueryError:
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self.info('failed to query duration of %r' % self._path)
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raise
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# wavparse 0.10.14 returns in bytes
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if qformat == gst.FORMAT_BYTES:
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self.debug('query returned in BYTES format')
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length /= 4
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self.debug('total length of %r in samples: %d', self._path, length)
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self.length = length
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self._pipeline.set_state(gst.STATE_NULL)
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self.stop()
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def _error_cb(self, bus, msg):
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error, debug = msg.parse_error()
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self.debug('Got GStreamer error: %r, debug: %r' % (
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error.message, debug))
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# give us an exception stack for debugging
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try:
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raise error
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except:
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pass
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self.setException(error)
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self.stop()
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class ImageVerifyTask(task.MultiSeparateTask):
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"""
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I verify a disk image and get the necessary track lengths.
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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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for trackIndex, track in enumerate(cue.table.tracks):
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self.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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self.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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self.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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self.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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# print '%d has length %d' % (trackIndex, taskk.length)
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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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"""
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I encode a disk image to a different format.
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"""
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description = "Encoding tracks"
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def __init__(self, image, profile, outdir):
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task.MultiSeparateTask.__init__(self)
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self._image = image
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self._profile = profile
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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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# here to avoid import gst eating our options
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from morituri.common import encode
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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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self.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 + '.' + profile.extension)
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self.debug('schedule encode to %r', outpath)
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taskk = encode.EncodeTask(path, os.path.join(outdir,
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root + '.' + profile.extension), profile)
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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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self.debug('encoding htoa track')
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add(htoa)
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except (KeyError, IndexError):
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self.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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self.debug('encoding track %d', trackIndex + 1)
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index = track.indexes[1]
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add(index)
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