/usr/lib/x86_64-linux-gnu/rhythmbox/plugins/replaygain/player.py is in rhythmbox-plugins 3.4.2-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | # -*- Mode: python; coding: utf-8; tab-width: 8; indent-tabs-mode: t; -*-
#
# Copyright (C) 2010 Jonathan Matthew
#
# 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.
#
# The Rhythmbox authors hereby grant permission for non-GPL compatible
# GStreamer plugins to be used and distributed together with GStreamer
# and Rhythmbox. This permission is above and beyond the permissions granted
# by the GPL license by which Rhythmbox is covered. If you modify this code
# you may extend this exception to your version of the code, but you are not
# obligated to do so. If you do not wish to do so, delete this exception
# statement from your 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
import rb
import gi
gi.require_version("Gst", "1.0")
from gi.repository import RB
from gi.repository import GObject, Gio, Gst
import config
import gettext
gettext.install('rhythmbox', RB.locale_dir())
EPSILON = 0.001
class ReplayGainPlayer(object):
def __init__(self, shell):
# make sure the replaygain elements are available
missing = []
required = ("rgvolume", "rglimiter")
for e in required:
if Gst.ElementFactory.find(e) is None:
missing.append(e)
if len(missing) > 0:
msg = _("The GStreamer elements required for ReplayGain processing are not available. The missing elements are: %s") % ", ".join(missing)
RB.error_dialog(shell.props.window, _("ReplayGain GStreamer plugins not available"), msg)
raise Exception(msg)
self.shell_player = shell.props.shell_player
self.player = self.shell_player.props.player
self.settings = Gio.Settings.new("org.gnome.rhythmbox.plugins.replaygain")
self.settings.connect("changed::limiter", self.limiter_changed_cb)
self.previous_gain = []
self.fallback_gain = 0.0
# we use different means to hook into the playback pipeline depending on
# the playback backend in use
if GObject.signal_lookup("get-stream-filters", self.player):
self.setup_xfade_mode()
self.deactivate_backend = self.deactivate_xfade_mode
else:
self.setup_playbin_mode()
self.deactivate_backend = self.deactivate_playbin_mode
def deactivate(self):
self.deactivate_backend()
self.player = None
self.shell_player = None
def set_rgvolume(self, rgvolume):
# set preamp level
preamp = self.settings['preamp']
rgvolume.props.pre_amp = preamp
# set mode
# there may eventually be a 'guess' mode here that tries to figure out
# what to do based on the upcoming tracks
mode = self.settings['mode']
if mode == config.REPLAYGAIN_MODE_ALBUM:
rgvolume.props.album_mode = 1
else:
rgvolume.props.album_mode = 0
# set calculated fallback gain
rgvolume.props.fallback_gain = self.fallback_gain
print("updated rgvolume settings: preamp %f, album-mode %s, fallback gain %f" % (
rgvolume.props.pre_amp, str(rgvolume.props.album_mode), rgvolume.props.fallback_gain))
def update_fallback_gain(self, rgvolume):
gain = rgvolume.props.target_gain - rgvolume.props.pre_amp
# filter out bogus notifications
if abs(gain - self.fallback_gain) < EPSILON:
print("ignoring gain %f (current fallback gain)" % gain)
return False
if abs(gain) < EPSILON:
print("ignoring zero gain (pretty unlikely)")
return False
# update the running average
if len(self.previous_gain) == config.AVERAGE_GAIN_SAMPLES:
self.previous_gain.pop(0)
self.previous_gain.append(gain)
self.fallback_gain = sum(self.previous_gain) / len(self.previous_gain)
print("got target gain %f; running average of previous gain values is %f" % (gain, self.fallback_gain))
return True
### playbin mode (rgvolume ! rglimiter as global filter)
def playbin_target_gain_cb(self, rgvolume, pspec):
self.update_fallback_gain(rgvolume)
def setup_playbin_mode(self):
print("using output filter for rgvolume and rglimiter")
self.rgfilter = Gst.Bin()
self.rgvolume = Gst.ElementFactory.make("rgvolume", None)
self.rgvolume.connect("notify::target-gain", self.playbin_target_gain_cb)
self.rgfilter.add(self.rgvolume)
self.rglimiter = Gst.ElementFactory.make("rglimiter", None)
self.rgfilter.add(self.rglimiter)
self.rgfilter.add_pad(Gst.GhostPad.new("sink", self.rgvolume.get_static_pad("sink")))
self.rgfilter.add_pad(Gst.GhostPad.new("src", self.rglimiter.get_static_pad("src")))
self.rgvolume.link(self.rglimiter)
self.player.add_filter(self.rgfilter)
def deactivate_playbin_mode(self):
self.player.remove_filter(self.rgfilter)
self.rgfilter = None
### xfade mode (rgvolume as stream filter, rglimiter as global filter)
def xfade_target_gain_cb(self, rgvolume, pspec):
if self.update_fallback_gain(rgvolume) is True:
# we don't want any further notifications from this stream
rgvolume.disconnect_by_func(self.xfade_target_gain_cb)
def create_stream_filter_cb(self, player, uri):
print("creating rgvolume instance for stream %s" % uri)
rgvolume = Gst.ElementFactory.make("rgvolume", None)
rgvolume.connect("notify::target-gain", self.xfade_target_gain_cb)
self.set_rgvolume(rgvolume)
return [rgvolume]
def limiter_changed_cb(self, settings, key):
if self.rglimiter is not None:
limiter = settings['limiter']
print("limiter setting is now %s" % str(limiter))
self.rglimiter.props.enabled = limiter
def setup_xfade_mode(self):
print("using per-stream filter for rgvolume")
self.stream_filter_id = self.player.connect("get-stream-filters", self.create_stream_filter_cb)
# and add rglimiter as an output filter
self.rglimiter = Gst.ElementFactory.make("rglimiter", None)
self.player.add_filter(self.rglimiter)
def deactivate_xfade_mode(self):
self.player.disconnect(self.stream_filter_id)
self.stream_filter_id = None
self.player.remove_filter(self.rglimiter)
self.rglimiter = None
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