/usr/share/pyshared/rgain/script/collectiongain.py is in python-rgain 1.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2009, 2010 Felix Krull <f_krull@gmx.de>
#
# This program 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 2, or (at your option)
# any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import sys
import os.path
try:
from hashlib import md5
except ImportError:
from md5 import new as md5
try:
import cPickle as pickle
except ImportError:
import pickle
import mutagen
from mutagen.id3 import TXXX
from rgain import rgio
from rgain.script import ou, un, Error, common_options
from rgain.script.replaygain import do_gain
# all of collectiongain
def relpath(path, base):
size = len(base)
if os.path.basename(base):
# this means ``base`` does not end with a separator
size += 1
return path[size:]
def read_cache(cache_file):
if not os.path.isfile(cache_file):
files = {}
else:
try:
f = open(cache_file, "rb")
files = pickle.load(f)
except Exception, exc:
print ou(u"Error while reading the cache - %s" % exc)
finally:
try:
f.close()
except NameError:
pass
return files
def write_cache(cache_file, files):
cache_dir = os.path.dirname(cache_file)
try:
if not os.path.isdir(cache_dir):
os.makedirs(cache_dir, 0755)
f = open(cache_file, "wb")
pickle.dump(files, f, 2)
except Exception, exc:
print ou(u"Error while writing the cache - %s" % exc)
finally:
try:
f.close()
except NameError:
pass
def validate_cache(files):
for filepath, record in files.items():
if (isinstance(filepath, basestring) and
hasattr(record, "__getitem__") and
hasattr(record, "__len__") and
len(record) == 3 and
(isinstance(record[0], basestring) or
record[0] is None) and
(isinstance(record[1], int) or
isinstance(record[1], float)) and
isinstance(record[2], bool)
):
continue
else:
# funny record, purge it
del files[filepath]
def get_album_id(music_dir, filepath):
properpath = os.path.join(music_dir, filepath)
ext = os.path.splitext(filepath)[1]
try:
tags = mutagen.File(properpath)
except Exception, exc:
raise Error(u"%s: error - %s" % (filepath, exc))
if ext == ".mp3":
if "TALB" in tags:
album = tags["TALB"].text[0]
else:
album = None
else:
album = tags.get("album", [""])[0]
if album:
if ext == ".mp3":
artist = None
for frame in tags.itervalues():
if isinstance(frame, TXXX) and "albumartist" in frame.desc:
# these heuristics are a bit fragile
artist = frame.text[0]
break
if not artist:
# TODO: is this correct?
if "TPE1" in tags:
artist = tags["TPE1"].text[0]
else:
artist = tags.get("albumartist") or tags.get("artist")
if artist:
artist = artist[0]
if not artist:
artist = u""
album_id = u"%s - %s" % (artist, album)
else:
album_id = None
return album_id
def collect_files(music_dir, files, cache, supported_formats):
i = 0
for dirpath, dirnames, filenames in os.walk(music_dir):
for filename in filenames:
filepath = un(relpath(os.path.join(dirpath, filename), music_dir),
sys.getfilesystemencoding())
properpath = os.path.join(dirpath, filename)
mtime = os.path.getmtime(properpath)
# check the cache
if filepath in cache:
cache[filepath] = True
record = files[filepath]
if mtime <= record[1]:
# the file's still ok
continue
ext = os.path.splitext(filename)[1]
if ext in supported_formats:
i += 1
print ou(u" [%i] %s |" % (i, filepath)),
album_id = get_album_id(music_dir, filepath)
print ou(album_id or u"<single track>")
# fields here: album_id, mtime, already_processed
files[filepath] = (album_id, mtime, False)
def transform_cache(files, ignore_cache=False):
# transform ``files`` into a usable data structure
albums = {}
single_tracks = []
for filepath, (album_id, mtime, processed) in files.iteritems():
if album_id is not None:
albums.setdefault(album_id, []).append(filepath)
else:
single_tracks.append(filepath)
# purge anything that's marked as processed, if desired
if not ignore_cache:
for album_id, album_files in albums.items():
keep = False
for filepath in album_files:
if not files[filepath][2]:
keep = True
break
if not keep:
del albums[album_id]
for filepath in single_tracks[:]:
if files[filepath][2]:
single_tracks.remove(filepath)
return albums, single_tracks
def update_cache(files, music_dir, tracks, album_id):
for filepath in tracks:
mtime = os.path.getmtime(os.path.join(music_dir, filepath))
files[filepath] = (album_id, mtime, True)
def do_gain_all(music_dir, albums, single_tracks, files, ref_level=89,
force=False, dry_run=False, mp3_format="ql", stop_on_error=False):
if single_tracks:
do_gain((os.path.join(music_dir, path) for path in single_tracks),
ref_level, force, dry_run, False, mp3_format)
# update cache information
if not dry_run:
update_cache(files, music_dir, single_tracks, None)
print
for album_id, album_files in albums.iteritems():
print ou(u"%s:" % album_id),
do_gain((os.path.join(music_dir, path) for path in album_files),
ref_level, force, dry_run, True, mp3_format)
# update cache
if not dry_run:
update_cache(files, music_dir, album_files, album_id)
print
def do_collectiongain(music_dir, ref_level=89, force=False, dry_run=False,
mp3_format="ql", ignore_cache=False):
music_dir = un(music_dir, sys.getfilesystemencoding())
music_abspath = os.path.abspath(music_dir)
musicpath_hash = md5(music_abspath).hexdigest()
cache_file = os.path.join(os.path.expanduser("~"), ".cache",
"collectiongain-cache.%s" % musicpath_hash)
# load the cache
files = read_cache(cache_file)
# yeah, side-effects are bad, I know
validate_cache(files)
cache = dict.fromkeys(files.iterkeys(), False)
print "Collecting files ..."
# whenever this part is stopped (KeyboardInterrupt/other exception), the
# cache is written to disk so all progress persists
try:
collect_files(music_dir, files, cache,
rgio.BaseFormatsMap(mp3_format).supported_formats)
# clean cache
for filepath, visited in cache.items():
if not visited:
del cache[filepath]
del files[filepath]
# hopefully gets rid of at least one huge data structure
del cache
albums, single_tracks = transform_cache(files, ignore_cache)
print
# gain everything that has survived the cleansing
do_gain_all(music_dir, albums, single_tracks, files, ref_level, force,
dry_run, mp3_format)
finally:
validate_cache(files)
write_cache(cache_file, files)
print "All finished."
def collectiongain_options():
opts = common_options()
opts.add_option("--ignore-cache", help="Don't trust implicit assumptions "
"about what was already done, instead check all files for "
"Replay Gain data explicitly.", dest="ignore_cache",
action="store_true")
opts.set_defaults(ignore_cache=False)
opts.set_usage("%prog [options] MUSIC_DIR")
opts.set_description("Calculate Replay Gain for a large set of audio files "
"without asking many questions. This program "
"calculates an album ID for any audo file in "
"MUSIC_DIR. Then, album gain will be applied to all "
"files with the same album ID. The album ID is "
"created from file tags as follows: If an 'album' tag "
"is present, it is joined with the contents of an "
"'albumartist' tag, or, if that isn't set, the "
"contents of the 'artist' tag, or nothing if there is "
"no 'artist' tag as well. On the other hand, if no "
"'album' tag is present, the file is assumed to be a "
"single track without album; in that case, no album "
"gain will be calculated for that file.")
return opts
def collectiongain():
optparser = collectiongain_options()
opts, args = optparser.parse_args()
if len(args) != 1:
optparser.error("pass one directory path")
try:
do_collectiongain(args[0], opts.ref_level, opts.force, opts.dry_run,
opts.mp3_format, opts.ignore_cache)
except Error, exc:
print >> sys.stderr, ou(unicode(exc))
sys.exit(1)
except KeyboardInterrupt:
print "Interrupted."
if __name__ == "__main__":
collectiongain()
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