Files
whipper-gui/whipper/common/checksum.py
JoeLametta e7bfc34c0e Rename 'throwaway' variables to single underscore
Also removed unused ones
2019-02-02 19:19:49 +01:00

65 lines
1.9 KiB
Python

# -*- Mode: Python; test-case-name: whipper.test.test_common_checksum -*-
# vi:si:et:sw=4:sts=4:ts=4
# Copyright (C) 2009 Thomas Vander Stichele
# This file is part of whipper.
#
# whipper is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# whipper is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with whipper. If not, see <http://www.gnu.org/licenses/>.
import binascii
import wave
import tempfile
import subprocess
import os
from whipper.extern.task import task as etask
import logging
logger = logging.getLogger(__name__)
# checksums are not CRC's. a CRC is a specific type of checksum.
class CRC32Task(etask.Task):
# TODO: Support sampleStart, sampleLength later on (should be trivial, just
# add change the read part in _crc32 to skip some samples and/or not
# read too far)
def __init__(self, path, sampleStart=0, sampleLength=-1, is_wave=True):
self.path = path
self.is_wave = is_wave
def start(self, runner):
etask.Task.start(self, runner)
self.schedule(0.0, self._crc32)
def _crc32(self):
if not self.is_wave:
_, tmpf = tempfile.mkstemp()
try:
subprocess.check_call(['flac', '-d', self.path, '-fo', tmpf])
w = wave.open(tmpf)
finally:
os.remove(tmpf)
else:
w = wave.open(self.path)
d = w._data_chunk.read()
self.checksum = binascii.crc32(d) & 0xffffffff
self.stop()