77 lines
2.3 KiB
Python
77 lines
2.3 KiB
Python
# -*- Mode: Python; test-case-name: morituri.test.test_common_checksum -*-
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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 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 binascii
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import wave
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from morituri.extern.task import task as etask
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from morituri.program.arc import accuraterip_checksum
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import logging
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logger = logging.getLogger(__name__)
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# checksums are not CRC's. a CRC is a specific type of checksum.
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class CRC32Task(etask.Task):
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# TODO: Support sampleStart, sampleLength later on (should be trivial, just
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# add change the read part in _crc32 to skip some samples and/or not
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# read too far)
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def __init__(self, path, sampleStart=0, sampleLength=-1):
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self.path = path
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def start(self, runner):
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etask.Task.start(self, runner)
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self.schedule(0.0, self._crc32)
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def _crc32(self):
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w = wave.open(self.path)
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d = w._data_chunk.read()
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self.checksum = binascii.crc32(d) & 0xffffffff
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self.stop()
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class FastAccurateRipChecksumTask(etask.Task):
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description = 'Calculating (Fast) AccurateRip checksum'
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def __init__(self, path, trackNumber, trackCount, wave, v2=False):
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self.path = path
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self.trackNumber = trackNumber
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self.trackCount = trackCount
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self._wave = wave
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self._v2 = v2
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self.checksum = None
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def start(self, runner):
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etask.Task.start(self, runner)
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self.schedule(0.0, self._arc)
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def _arc(self):
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arc = accuraterip_checksum(self.path, self.trackNumber, self.trackCount,
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self._wave, self._v2)
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self.checksum = arc
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self.stop()
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