3 # Copyright (C) 2009-2012 W. Trevor King <wking@drexel.edu>
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU Lesser General Public License as
7 # published by the Free Software Foundation, either version 3 of the
8 # License, or (at your option) any later version.
10 # This program is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # Lesser General Public License for more details.
15 # You should have received a copy of the GNU Lesser General Public
16 # License along with this program. If not, see
17 # <http://www.gnu.org/licenses/>.
19 """Mirror a tree of audio files in another format.
21 Conversion between any of the following formats are supported:
29 External packages required for full functionality:
35 * vorbis_ (`ogg123`, `oggenc`)
36 * mutagen_ (metadata conversion)
38 .. _lame: http://lame.sourceforge.net/
39 .. _faad: http://www.audiocoding.com/faad2.html
40 .. _flac: http://flac.sourceforge.net/
41 .. _mpg123: http://www.mpg123.org/
42 .. _vorbis: http://www.vorbis.com/
43 .. _mutagen: http://code.google.com/p/mutagen/
46 from hashlib import sha256 as _hash
49 import shutil as _shutil
50 import subprocess as _subprocess
51 import tempfile as _tempfile
54 import mutagen as _mutagen
55 import mutagen.flac as _mutagen_flag
56 import mutagen.id3 as _mutagen_id3
57 import mutagen.m4a as _mutagen_m4a
58 import mutagen.mp3 as _mutagen_mp3
59 import mutagen.oggvorbis as _mutagen_oggvorbis
60 except ImportError as _mutagen_import_error:
67 def invoke(args, stdin=None, expect=(0,)):
68 print(' {}'.format(args))
69 p = _subprocess.Popen(
70 args, stdin=_subprocess.PIPE, stdout=_subprocess.PIPE,
71 stderr=_subprocess.PIPE)
72 stdout,stderr = p.communicate(stdin)
74 assert status in expect, 'invalid status {} from {}'.format(status, args)
75 return (status, stdout, stderr)
78 class Converter (object):
79 """Recode audio files from `source_dir` to `target_dir`.
81 `target_extension` sets the target encoding.
86 The `get_` and `set_*_metadata` methods should pass metadata as a
87 `dict` with key/value pairs standardised to match the list of
88 Vorbis comment suggestions_ with lowercase keys. The `date` field
89 should be formatted `YYYY[-MM[-DD]]`. The dict values should be
90 lists to support repeated entries for a given tag.
92 .. _suggestions: http://www.xiph.org/vorbis/doc/v-comment.html
94 id3_to_vorbis_keys = {
101 'tpe2': 'accompaniment',
103 'tpos': 'part of set',
104 'tpub': 'organization', # publisher
105 'trck': 'tracknumber',
109 m4a_to_vorbis_keys = {
110 '\xa9cmt': 'comment',
116 #'tpe2': 'accompaniment',
117 #'tpe3': 'conductor',
118 'disk': 'part of set',
119 #'tpub': 'organization', # publisher
120 'trkn': 'tracknumber',
124 def __init__(self, source_dir, target_dir, target_extension='ogg',
125 cache_file=None, hash=True, ignore_function=None):
126 self.source_dir = source_dir
127 self.target_dir = target_dir
128 self._source_extensions = ['flac', 'm4a', 'mp3', 'ogg', 'wav']
129 self._target_extension = target_extension
130 self._cache_file = cache_file
131 self._cache = self._read_cache()
133 self._ignore_function = ignore_function
134 f,self._tempfile = _tempfile.mkstemp(prefix='mkogg-')
137 _os.remove(self._tempfile)
140 def _read_cache(self):
142 if self._cache_file == None:
145 with open(self._cache_file, 'r') as f:
147 assert line.startswith('# mkogg cache version:'), line
148 version = line.split(':', 1)[-1].strip()
149 if version != __version__:
150 print('cache version mismatch: {} != {}'.format(
151 version, __version__))
152 return cache # old cache, ignore contents
155 key,value = [x.strip() for x in line.split(' -> ')]
163 def _save_cache(self):
164 if self._cache_file == None:
166 with open(self._cache_file, 'w') as f:
167 f.write('# mkogg cache version: {}\n'.format(__version__))
168 for key,value in self._cache.iteritems():
169 f.write('{} -> {}\n'.format(key, value))
172 self._makedirs(self.target_dir)
173 for dirpath,dirnames,filenames in _os.walk(self.source_dir):
174 for filename in filenames:
175 root,ext = _os.path.splitext(filename)
177 if ext.startswith('.'):
179 if ext not in self._source_extensions:
180 print('skip', filename, ext)
182 source_path = _os.path.join(dirpath, filename)
183 if (self._ignore_function is not None and
184 self._ignore_function(source_path)):
186 rel_path = _os.path.relpath(dirpath, self.source_dir)
187 target_path = _os.path.join(
188 self.target_dir, rel_path,
189 '{}.{}'.format(root, self._target_extension))
190 target_dir = _os.path.dirname(target_path)
191 self._makedirs(target_dir)
192 self._convert(source_path, target_path, ext)
194 def _makedirs(self, target_dir):
195 if not _os.path.exists(target_dir):
196 _os.makedirs(target_dir)
198 def _convert(self, source, target, ext):
200 cache_key = self._cache_key(source)
201 old_cache_value = self._cache.get(cache_key, None)
202 if (old_cache_value != None and
203 old_cache_value == self._cache_value(target)):
204 print('already cached {} to {}'.format(source, target))
206 elif _os.path.exists(target):
207 print('target {} already exists'.format(target))
209 print('convert {} to {}'.format(source, target))
210 if ext == self._target_extension:
211 _shutil.copy(source, target)
214 convert = getattr(self, 'convert_{}_to_{}'.format(
215 ext, self._target_extension))
216 except AttributeError:
217 to_wav = getattr(self, 'convert_{}_to_wav'.format(ext))
218 from_wav = getattr(self, 'convert_wav_to_{}'.format(
219 self._target_extension))
220 def convert(source, target):
221 to_wav(source, self._tempfile)
222 from_wav(self._tempfile, target)
223 convert(source, target)
224 if not getattr(convert, 'handles_metadata', False):
225 get_metadata = getattr(self, 'get_{}_metadata'.format(ext))
226 metadata = get_metadata(source)
227 set_metadata = getattr(self, 'set_{}_metadata'.format(
228 self._target_extension))
229 set_metadata(target, metadata)
231 cache_key = self._cache_key(source)
232 self._cache[cache_key] = self._cache_value(target)
234 def _cache_key(self, source):
235 return repr((self._file_hash(source), self._target_extension))
237 def _cache_value(self, target):
238 return self._file_hash(target)
240 def _file_hash(self, filename):
244 >>> c = Converter(None, None)
245 >>> h = c._file_hash(__file__)
248 >>> c._file_hash('/highly/unlikely/to/exist') == None
253 chunk_size = 2**20 # 1 Mb
255 with open(filename, 'rb') as f:
257 while len(chunk) > 0:
258 chunk = f.read(chunk_size)
262 return str(h.hexdigest())
264 def _set_vorbis_comments(self, container, metadata):
266 if type(metadata) == dict:
267 items = sorted(metadata.items())
269 items = metadata.items()
270 for key,value in items:
271 # leave key case alone, because Mutagen downcases Vorbis
273 container[key] = value
275 def _parse_date(self, date):
276 """Parse `date` (`YYYY[-MM[-DD]]`), returning `(year, month, day)`.
280 >>> c = Converter(None, None)
281 >>> c._parse_date('2010')
283 >>> c._parse_date('2010-11')
285 >>> c._parse_date('2010-11-16')
289 fields = date.split('-')
290 assert len(fields) > 0 and len(fields) <= 3, date
291 fields = fields + [None] * (3 - len(fields))
294 def _construct_id3_trck(self, metadata):
295 if 'tracknumber' not in metadata:
297 if 'tracktotal' in metadata:
299 for i,v in enumerate(metadata['tracknumber']):
300 value.append('{}/{}'.format(
301 v, metadata['tracktotal'][i]))
303 value = metadata['tracknumber']
307 def _guess_id3_encoding(self, text_list):
308 for id3_encoding,encoding in [(0, 'ISO-8859-1'), (3, 'utf-8')]:
309 encoding_success = True
310 for text in text_list:
311 if isinstance(text, unicode):
313 text.encode(encoding)
314 except UnicodeEncodeError:
315 encoding_success = False
319 raise ValueError(text_list)
321 def convert_flac_to_wav(self, source, target):
322 invoke(['ogg123', '-d', 'wav', '-f', target, source])
324 def convert_flac_to_ogg(self, source, target):
325 invoke(['oggenc', '--quiet', '-q', '3', source, '-o', target])
326 convert_flac_to_ogg.handles_metadata = True
328 def convert_m4a_to_wav(self, source, target):
329 invoke(['faad', '-o', target, source])
331 def convert_mp3_to_wav(self, source, target):
332 invoke(['mpg123', '-w', target, source])
334 def convert_ogg_to_wav(self, source, target):
335 self.convert_flac_to_wav(source, target)
337 def convert_wav_to_flac(self, source, target):
338 invoke(['flac', '--force', '--output-name', target, source])
340 def convert_wav_to_mp3(self, source, target):
341 invoke(['lame', '--quiet', '-V', '4', source, target])
343 def convert_wav_to_ogg(self, source, target):
344 self.convert_flac_to_ogg(source, target)
346 def get_flac_metadata(self, source):
348 raise _mutagen_import_error
349 return _mutagen_flac.FLAC(source)
351 def get_m4a_metadata(self, source):
353 raise _mutagen_import_error
354 m4a = _mutagen_m4a.M4A(source)
356 for key,value in m4a.items():
358 vorbis_key = self.m4a_to_vorbis_keys[key.lower()]
361 if vorbis_key == 'tracknumber':
362 tracknumber,tracktotal = value
365 metadata['tracktotal'] = [str(tracktotal)]
366 elif vorbis_key == 'part of set':
367 disknumber,disktotal = value
370 metadata['set total'] = [str(disktotal)]
371 metadata[vorbis_key] = [str(value)]
374 def get_mp3_metadata(self, source):
376 raise _mutagen_import_error
377 mp3 = _mutagen_mp3.MP3(source)
379 for key,value in mp3.items():
381 vorbis_key = self.id3_to_vorbis_keys[key.lower()]
385 if vorbis_key == 'tracknumber':
386 for i,v_entry in enumerate(v):
388 tracknumber,tracktotal = v_entry.split('/', 1)
390 metadata['tracktotal'] = ['tracktotal']
391 metadata[vorbis_key] = v
394 def get_ogg_metadata(self, source):
396 raise _mutagen_import_error
397 return _mutagen_oggvorbis.OggVorbis(source)
399 def get_wav_metadata(self, source):
402 def set_flac_metadata(self, target, metadata):
404 raise _mutagen_import_error
405 flac = _mutagen_flac.FLAC(target)
406 self._set_vorbis_comments(flac, metadata)
409 def set_mp3_metadata(self, target, metadata):
410 vorbis_keys_to_id3 = dict(
411 (v,k) for k,v in self.id3_to_vorbis_keys.items())
413 raise _mutagen_import_error
414 mp3 = _mutagen_mp3.MP3(target)
415 if mp3.tags is not None:
419 for key,value in metadata.items():
421 for i,v in enumerate(value):
422 year,month,day = self._parse_date(v)
424 elif key in ['tracknumber', 'tracktotal']:
425 if handled_trck is True:
428 key,value = self._construct_id3_trck(metadata)
432 frame_name = vorbis_keys_to_id3[key].upper()
435 frame = getattr(_mutagen_id3, frame_name)
436 id3_encoding = self._guess_id3_encoding(value)
437 max_encoding = max(max_encoding, id3_encoding)
438 mp3[frame_name] = frame(encoding=id3_encoding, text=value)
441 if max_encoding: # at least one tag doesn't use ISO-8859-1
442 v1 = 0 # remove ID3v1 tags
444 v1 = 2 # create and/or update ID3v1 tags
447 def set_ogg_metadata(self, target, metadata):
449 raise _mutagen_import_error
450 ogg = _mutagen_oggvorbis.OggVorbis(target)
451 self._set_vorbis_comments(ogg, metadata)
454 def set_wav_metadata(self, target, metadata):
460 results = doctest.testmod()
461 return results.failed % 127
464 if __name__ == '__main__':
468 usage = '%prog [options] source-dir target-dir'
470 p = optparse.OptionParser(usage=usage, epilog=epilog)
471 p.format_epilog = lambda formatter: epilog+'\n'
472 p.add_option('-t', '--target-extension', dest='ext',
473 default='ogg', metavar='EXT',
474 help='Conversion target type (e.g. flac, mp3) (%default)')
475 p.add_option('-c', '--cache', dest='cache', metavar='PATH',
476 help=('Save conversion hashes in a cache file to avoid '
477 'repeated previous conversions.'))
478 p.add_option('-n', '--no-hash', dest='hash', action='store_false',
480 help=("Don't hash files. Just assume matching names would "
481 'have matching hashes.'))
482 p.add_option('-i', '--ignore', dest='ignore', metavar='REGEXP',
483 help=('Ignore source paths matching REGEXP.'))
484 p.add_option('--test', dest='test', action='store_true', default=False,
485 help='Run internal tests and exit')
487 options,args = p.parse_args()
492 if options.ignore is not None:
493 ignore_regexp = _re.compile(options.ignore)
494 ignore_function = ignore_regexp.match
496 ignore_function = None
498 source_dir,target_dir = args
499 c = Converter(source_dir, target_dir, target_extension=options.ext,
500 cache_file=options.cache, hash=options.hash,
501 ignore_function=ignore_function)