197 lines
6.4 KiB
Python
197 lines
6.4 KiB
Python
# -*- Mode: Python; test-case-name: morituri.test.test_program_cdparanoia -*-
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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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import os
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import re
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import stat
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import subprocess
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from morituri.common import task, log, common, checksum
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from morituri.extern import asyncsub
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_PROGRESS_RE = re.compile(r"""
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^\#\#: (?P<code>.+)\s # function code
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\[(?P<function>.*)\]\s@\s # function name
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(?P<offset>\d+) # offset
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""", re.VERBOSE)
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# from reading cdparanoia source code, it looks like offset is reported in
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# number of single-channel samples, ie. 2 bytes per unit
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class ProgressParser(object):
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read = 0
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def parse(self, line):
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"""
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Parse a line.
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"""
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m = _PROGRESS_RE.search(line)
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if m:
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code = int(m.group('code'))
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function = m.group('function')
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offset = int(m.group('offset'))
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if function == 'read':
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if offset % 1176 != 0:
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print 'THOMAS: not a multiple of 2532', offset
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print line
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else:
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self.read = offset / 1176
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# FIXME: handle errors
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class ReadTrackTask(task.Task):
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"""
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I am a task that reads a track using cdparanoia.
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"""
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description = "Reading Track..."
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def __init__(self, path, table, start, stop, offset=0):
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"""
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Read the given track.
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@param path: where to store the ripped track
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@type path: str
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@param table: table of contents of CD
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@type table: L{table.Table}
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@param start: first frame to rip
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@type start: int
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@param stop: last frame to rip (inclusive)
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@type stop: int
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@param offset: read offset, in samples
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@type offset: int
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"""
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self.path = path
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self._table = table
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self._start = start
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self._stop = stop
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self._offset = offset
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self._parser = ProgressParser()
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self._buffer = "" # accumulate characters
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self._errors = []
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def start(self, runner):
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task.Task.start(self, runner)
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# find on which track the range starts and stops
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startTrack = 1
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startOffset = 0
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stopTrack = 1
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stopOffset = self._stop
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for i, t in enumerate(self._table.tracks):
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if t.start <= self._start:
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startTrack = i + 1
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startOffset = self._start - t.start
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if t.end <= self._stop:
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stopTrack = i + 1
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stopOffset = self._stop - t.start
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self.debug('Ripping from %d to %d (inclusive)', self._start, self._stop)
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self.debug('Starting at track %d, offset %d', startTrack, startOffset)
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self.debug('Stopping at track %d, offset %d', stopTrack, stopOffset)
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bufsize = 1024
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argv = ["cdparanoia",
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"--sample-offset=%d" % self._offset,
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"--stderr-progress",
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"%d[%s]-%d[%s]" % (
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startTrack, common.framesToHMSF(startOffset),
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stopTrack, common.framesToHMSF(stopOffset)),
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self.path]
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self.debug('Running %s' % (" ".join(argv), ))
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self._popen = asyncsub.Popen(argv,
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bufsize=bufsize,
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stdin=subprocess.PIPE, stdout=subprocess.PIPE,
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stderr=subprocess.PIPE, close_fds=True)
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self.runner.schedule(1.0, self._read, runner)
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def _read(self, runner):
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ret = self._popen.recv_err()
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if not ret:
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if self._popen.poll() is not None:
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self._done()
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return
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self.runner.schedule(0.01, self._read, runner)
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return
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self._buffer += ret
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# parse buffer into lines if possible, and parse them
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if "\n" in self._buffer:
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lines = self._buffer.split('\n')
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if lines[-1] != "\n":
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# last line didn't end yet
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self._buffer = lines[-1]
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del lines[-1]
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else:
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self._buffer = ""
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for line in lines:
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self._parser.parse(line)
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# FIXME: self._parser.read *will* go past self._stop,
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# and only indicates read frames, not written frames.
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# but we can't rely on anything else.
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num = float(self._parser.read) - self._start
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den = float(self._stop) - self._start
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progress = num / den
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if progress < 1.0:
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self.setProgress(progress)
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# 0 does not give us output before we complete, 1.0 gives us output
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# too late
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self.runner.schedule(0.01, self._read, runner)
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def _poll(self, runner):
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if self._popen.poll() is None:
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self.runner.schedule(1.0, self._poll, runner)
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return
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self._done()
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def _done(self):
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self.setProgress(1.0)
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# check if the length matches
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size = os.stat(self.path)[stat.ST_SIZE]
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# wav header is 44 bytes
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offsetLength = self._stop - self._start + 1
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expected = offsetLength * checksum.BYTES_PER_FRAME + 44
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if size != expected:
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print 'ERROR: file size %d did not match expected size %d' % (
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size, expected)
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if (size - expected) % checksum.BYTES_PER_FRAME == 0:
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print 'ERROR: %d frames difference' % (
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(size - expected) / checksum.BYTES_PER_FRAME)
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else:
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print 'SIZE %d matches offset delta %d' % (size, self._stop - self._start)
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if self._popen.returncode != 0:
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if self._errors:
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print "\n".join(self._errors)
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else:
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print 'ERROR: exit code %r' % self._popen.returncode
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self.stop()
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return
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