/usr/share/pyshared/rgain/rgio.py is in python-rgain 1.2-1.
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) 2009-2012 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.
from itertools import combinations
import os.path
import warnings
import mutagen
from mutagen.id3 import ID3, RVA2, TXXX
from mutagen.apev2 import APEv2File
from rgain import GainData
class AudioFormatError(Exception):
def __init__(self, filename):
Exception.__init__(self, u"Did not understand file: %s" % filename)
def parse_db(string):
string = string.strip()
if string.lower().endswith("db"):
string = string[:-2].strip()
try:
db = float(string)
except ValueError:
db = None
return db
def parse_peak(string):
try:
peak = float(string.strip())
except ValueError:
peak = None
return peak
def almost_equal(a, b, epsilon):
if a is None and b is None:
return True
elif a is None or b is None:
return False
return abs(a - b) <= epsilon
# basic tag-based reader/writer, suited for Ogg (Vorbis, Flac, Speex, ...) and
# Flac files at least (also WavPack it seems)
def rg_read_gain(filename):
tags = mutagen.File(filename)
if tags is None:
raise AudioFormatError(filename)
def read_gain_data(desc):
gain_tag = u"replaygain_%s_gain" % desc
peak_tag = u"replaygain_%s_peak" % desc
if gain_tag in tags:
gain = parse_db(tags[gain_tag][0])
if gain is None:
return None
gaindata = GainData(gain)
if peak_tag in tags:
peak = parse_peak(tags[peak_tag][0])
if peak is not None:
gaindata.peak = peak
if u"replaygain_reference_loudness" in tags:
ref_level = parse_db(tags[u"replaygain_reference_loudness"][0])
if ref_level is not None:
gaindata.ref_level = ref_level
else:
gaindata = None
return gaindata
return read_gain_data("track"), read_gain_data("album")
def rg_write_gain(filename, trackdata, albumdata):
tags = mutagen.File(filename)
if tags is None:
raise AudioFormatError(filename)
if trackdata:
tags[u"replaygain_track_gain"] = u"%.8f dB" % trackdata.gain
tags[u"replaygain_track_peak"] = u"%.8f" % trackdata.peak
tags[u"replaygain_reference_loudness"] = u"%i dB" % trackdata.ref_level
if albumdata:
tags[u"replaygain_album_gain"] = u"%.8f dB" % albumdata.gain
tags[u"replaygain_album_peak"] = u"%.8f" % albumdata.peak
tags.save()
# ID3v2 support for legacy RVA2-frames-based format according to
# http://wiki.hydrogenaudio.org/index.php?title=ReplayGain_specification#ID3v2
REFERENCE_LOUDNESS_TAGS = [u"replaygain_reference_loudness",
u"QuodLibet::replaygain_reference_loudness"]
def mp3_legacy_read_gain(filename):
tags = ID3(filename)
if tags is None:
raise AudioFormatError(filename)
def read_gain_data(desc):
tag = u"RVA2:%s" % desc
if tag in tags:
frame = tags[tag]
gaindata = GainData(frame.gain, frame.peak)
# Read all supported reference loudness tags, using the first that
# exists.
for t in REFERENCE_LOUDNESS_TAGS:
if t in ("TXXX:%s" % t for t in tags):
gaindata.ref_level = parse_db(tags[t].text[0])
break
else:
gaindata = None
return gaindata
return read_gain_data("track"), read_gain_data("album")
def clamp_rva2_gain(v):
clamped = False
if v < -64:
v = -64
clamped = True
if v >= 64:
v = float(64 * 512 - 1) / 512.0
clamped = True
if clamped:
warnings.warn("gain value was out of bounds for RVA2 frame and was clamped to %.2f" % v)
return v
# I'm not sure if this situation could even reasonably happen, but
# can't hurt to check, right? Right!?
def clamp_rva2_peak(v):
clamped = False
if v < 0:
v = 0
clamped = True
if v >= 2:
v = float(2**16 - 1) / float(2**15)
clamped = True
if clamped:
warnings.warn("peak value was out of bounds for RVA2 frame and was clamped to %.5f" % v)
return v
def mp3_legacy_write_gain(filename, trackdata, albumdata):
tags = ID3(filename)
if tags is None:
raise AudioFormatError(filename)
if trackdata:
trackgain = RVA2(desc=u"track", channel=1,
gain=clamp_rva2_gain(trackdata.gain),
peak=clamp_rva2_peak(trackdata.peak))
tags.add(trackgain)
# write reference loudness tags
for t in REFERENCE_LOUDNESS_TAGS:
reflevel = TXXX(encoding=3, desc=t,
text=[u"%i dB" % trackdata.ref_level])
tags.add(reflevel)
if albumdata:
albumgain = RVA2(desc=u"album", channel=1,
gain=clamp_rva2_gain(albumdata.gain),
peak=clamp_rva2_peak(albumdata.peak))
tags.add(albumgain)
tags.save()
# ID3v2 support for TXXX:replaygain_* frames as specified in
# http://wiki.hydrogenaudio.org/index.php?title=ReplayGain_specification#ID3v2
# and as implemented by at least foobar2000.
def mp3_rgorg_read_gain(filename):
tags = ID3(filename)
if tags is None:
raise AudioFormatError(filename)
def read_gain_data(desc):
gain_tag = u"TXXX:replaygain_%s_gain" % desc
peak_tag = u"TXXX:replaygain_%s_peak" % desc
if gain_tag in tags:
gain = parse_db(tags[gain_tag].text[0])
if gain is None:
return None
gaindata = GainData(gain)
if peak_tag in tags:
peak = parse_peak(tags[peak_tag].text[0])
if peak is not None:
gaindata.peak = peak
if u"TXXX:replaygain_reference_loudness" in tags:
ref_level = parse_db(tags[
u"TXXX:replaygain_reference_loudness"
].text[0])
if ref_level is not None:
gaindata.ref_level = ref_level
else:
gaindata = None
return gaindata
return read_gain_data("track"), read_gain_data("album")
def mp3_rgorg_write_gain(filename, trackdata, albumdata):
tags = ID3(filename)
if tags is None:
raise AudioFormatError(filename)
def write_gain_data(desc, gaindata):
gain_frame = TXXX(encoding=3, desc=u"replaygain_%s_gain" % desc,
text=[u"%.8f dB" % gaindata.gain])
tags.add(gain_frame)
peak_frame = TXXX(encoding=3, desc=u"replaygain_%s_peak" % desc,
text=[u"%.8f" % gaindata.peak])
tags.add(peak_frame)
if trackdata:
write_gain_data("track", trackdata)
tags.add(TXXX(encoding=3, desc=u"replaygain_reference_loudness",
text=[u"%i dB" % trackdata.ref_level]))
if albumdata:
write_gain_data("album", albumdata)
tags.save()
# Special compatible MP3 support that
# - reads both rg.org and legacy gain, compares them, returns them if they
# match, else returns no gain data
# - writes both rg.org and legacy gain
GAIN_EPSILON = 0.1
PEAK_EPSILON = 0.001
REF_LEVEL_EPSILON = 0.1
# For these three functions, b is always the legacy values, i.e. the potentially
# clamped ones.
def gain_almost_equal(a, b):
return (almost_equal(a, b, GAIN_EPSILON) or
almost_equal(clamp_rva2_gain(a), b, GAIN_EPSILON))
def peak_almost_equal(a, b):
return (almost_equal(a, b, PEAK_EPSILON) or
almost_equal(clamp_rva2_peak(a), b, PEAK_EPSILON))
def gaindata_almost_equal(a, b):
# Ensure neither element is None.
if a is None:
return b is None
if b is None:
return a is None
if a == b:
return True
with warnings.catch_warnings():
warnings.filterwarnings("ignore")
return (gain_almost_equal(a.gain, b.gain) and
peak_almost_equal(a.peak, b.peak) and
almost_equal(a.ref_level, b.ref_level, REF_LEVEL_EPSILON))
def mp3_default_read_gain(filename):
rgorg = mp3_rgorg_read_gain(filename)
legacy = mp3_legacy_read_gain(filename)
# We want to ensure we have all bits of data so if we only have one format,
# we say we have none to enforce recalculation.
if rgorg[0] is None or legacy[0] is None:
return (None, None)
if (not gaindata_almost_equal(rgorg[0], legacy[0]) or
not gaindata_almost_equal(rgorg[1], legacy[1])):
# The different formats are not similar enough.
return (None, None)
else:
return rgorg
def mp3_default_write_gain(filename, trackdata, albumdata):
mp3_legacy_write_gain(filename, trackdata, albumdata)
mp3_rgorg_write_gain(filename, trackdata, albumdata)
# code to pull everything together
class UnknownFiletype(Exception):
pass
class BaseFormatsMap(object):
BASE_MAP = {
".ogg": (rg_read_gain, rg_write_gain),
".oga": (rg_read_gain, rg_write_gain),
".flac": (rg_read_gain, rg_write_gain),
".wv": (rg_read_gain, rg_write_gain),
}
MP3_FORMATS = {
None: (mp3_default_read_gain, mp3_default_write_gain),
"default": (mp3_default_read_gain, mp3_default_write_gain),
"replaygain.org": (mp3_rgorg_read_gain, mp3_rgorg_write_gain),
"fb2k": (mp3_rgorg_read_gain, mp3_rgorg_write_gain),
"legacy": (mp3_legacy_read_gain, mp3_legacy_write_gain),
"ql": (mp3_legacy_read_gain, mp3_legacy_write_gain),
}
MP3_DISPLAY_FORMATS = ["default", "replaygain.org", "legacy", "ql", "fb2k"]
MP3_DEFAULT_FORMAT = "default"
def __init__(self, mp3_format=None, more_mappings=None):
# yeah, you need to choose
self.more_mappings = more_mappings if more_mappings else {}
if mp3_format in self.MP3_FORMATS:
self.more_mappings[".mp3"] = self.MP3_FORMATS[mp3_format]
else:
raise ValueError("invalid MP3 format %r" % mp3_format)
@property
def supported_formats(self):
return (set(self.BASE_MAP.iterkeys()) |
set(self.more_mappings.iterkeys()))
def read_gain(self, filename):
ext = os.path.splitext(filename)[1]
if ext in self.more_mappings:
accessor = self.more_mappings[ext]
elif ext in self.BASE_MAP:
accessor = self.BASE_MAP[ext]
else:
raise UnknownFiletype(ext)
return accessor[0](filename)
def write_gain(self, filename, trackgain, albumgain):
ext = os.path.splitext(filename)[1]
if ext in self.more_mappings:
accessor = self.more_mappings[ext]
elif ext in self.BASE_MAP:
accessor = self.BASE_MAP[ext]
else:
raise UnknownFiletype(ext)
accessor[1](filename, trackgain, albumgain)
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