245 lines
7.6 KiB
Python
245 lines
7.6 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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import struct
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import gst
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from morituri.common import task, checksum, log
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from morituri.image import cue, table
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from morituri.test import common
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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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def __init__(self, path):
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"""
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@param path: .cue path
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"""
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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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"""
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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.ITTrack(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.IndexTable(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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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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checksumTask = checksum.AccurateRipChecksumTask(path,
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trackNumber=trackIndex + 1, trackCount=len(cue.table.tracks),
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frameStart=index.relative * checksum.SAMPLES_PER_FRAME,
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frameLength=length * checksum.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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description = 'Getting length of audio track'
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length = None
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def __init__(self, path):
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self._path = path
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def start(self, runner):
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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''' % self._path)
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self.debug('pausing')
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self._pipeline.set_state(gst.STATE_PAUSED)
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self._pipeline.get_state()
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self.debug('paused')
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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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length, format = sink.query_duration(gst.FORMAT_DEFAULT)
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# wavparse 0.10.14 returns in bytes
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if format == 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 %s 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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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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description = "Checking tracks"
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lengths = None
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def __init__(self, image):
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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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self.debug('schedule scan of audio length of %s', 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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# print '%d has length %d' % (trackIndex, taskk.length)
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index = track.indexes[1]
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assert taskk.length % checksum.SAMPLES_PER_FRAME == 0
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end = taskk.length / checksum.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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# FIXME: move this method to a different module ?
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def getAccurateRipResponses(data):
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ret = []
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while data:
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trackCount = struct.unpack("B", data[0])[0]
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bytes = 1 + 12 + trackCount * (1 + 8)
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ret.append(AccurateRipResponse(data[:bytes]))
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data = data[bytes:]
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return ret
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class AccurateRipResponse(object):
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"""
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I represent the response of the AccurateRip online database.
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"""
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trackCount = None
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discId1 = ""
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discId2 = ""
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cddbDiscId = ""
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confidences = None
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checksums = None
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def __init__(self, data):
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self.trackCount = struct.unpack("B", data[0])[0]
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self.discId1 = "%08x" % struct.unpack("<L", data[1:5])[0]
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self.discId2 = "%08x" % struct.unpack("<L", data[5:9])[0]
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self.cddbDiscId = "%08x" % struct.unpack("<L", data[9:13])[0]
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self.confidences = []
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self.checksums = []
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pos = 13
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for i in range(self.trackCount):
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confidence = struct.unpack("B", data[pos])[0]
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checksum = "%08x" % struct.unpack("<L", data[pos + 1:pos + 5])[0]
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pos += 9
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self.confidences.append(confidence)
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self.checksums.append(checksum)
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