/usr/share/pyshared/rgain/rgcalc.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.
"""Replay Gain analysis using GStreamer. See ``ReplayGain`` class for full
documentation or use the ``calculate`` function.
"""
import os.path
import pygst
pygst.require("0.10")
import gst
import gobject
from rgain import GainData
GST_TAG_REFERENCE_LEVEL = "replaygain-reference-level"
def to_utf8(string):
if isinstance(string, unicode):
return string.encode("utf-8")
else:
return string.decode("utf-8").encode("utf-8")
class ReplayGain(gobject.GObject):
"""Perform a Replay Gain analysis on some files.
This class doesn't actually write any Replay Gain information - that is left
as an exercise to the user. It only analyzes the files and presents the
result.
Basic usage is as follows:
- instantiate the class, passing it a list of file names and optionally the
reference loudness level to use (defaults to 89 dB),
- connect to the signals the class provides,
- get yourself a glib main loop (e.g. ``gobject.MainLoop`` or the one from
GTK),
- call ``replaygain_instance.start()`` to start processing,
- start your main loop to dispatch events and
- wait.
Once you've done that, you can retrieve the data from ``track_data`` (which
is a dict: keys are file names, values are ``GainData`` instances) and
``album_data`` (a 'GainData' instance, even though it may contain only
``None`` values if album gain isn't calculated). Note that the values don't
contain any kind of unit, which might be needed.
"""
__gsignals__ = {
"all-finished": (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
(gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT)),
"track-started": (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
(gobject.TYPE_STRING,)),
"track-finished": (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
(gobject.TYPE_STRING, gobject.TYPE_PYOBJECT)),
}
def __init__(self, files, force=False, ref_lvl=89):
gobject.GObject.__init__(self)
self.files = files
self.force = force
self.ref_lvl = ref_lvl
self._setup_pipeline()
self._setup_rg_elem()
self._files_iter = iter(self.files)
# this holds all track gain data
self.track_data = {}
self.album_data = GainData(0)
def start(self):
"""Start processing.
For it to work correctly, you'll need to run some gobject main loop
(e.g. the Gtk one) or process any events manually (though I have no
idea how or if that works).
"""
if not self._next_file():
raise ValueError("do never, ever run this thing without any files")
self.pipe.set_state(gst.STATE_PLAYING)
def pause(self, pause):
if pause:
self.pipe.set_state(gst.STATE_PAUSED)
else:
self.pipe.set_state(gst.STATE_PLAYING)
def stop(self):
self.pipe.set_state(gst.STATE_NULL)
# internal stuff
def _setup_pipeline(self):
"""Setup the pipeline."""
self.pipe = gst.Pipeline("replaygain")
# elements
self.decbin = gst.element_factory_make("decodebin", "decbin")
self.pipe.add(self.decbin)
self.conv = gst.element_factory_make("audioconvert", "conv")
self.pipe.add(self.conv)
self.res = gst.element_factory_make("audioresample", "res")
self.pipe.add(self.res)
self.rg = gst.element_factory_make("rganalysis", "rg")
self.pipe.add(self.rg)
self.sink = gst.element_factory_make("fakesink", "sink")
self.pipe.add(self.sink)
# link
gst.element_link_many(self.conv, self.res, self.rg, self.sink)
self.decbin.connect("pad-added", self._on_pad_added)
self.decbin.connect("pad-removed", self._on_pad_removed)
bus = self.pipe.get_bus()
bus.add_signal_watch()
bus.connect("message", self._on_message)
def _setup_rg_elem(self):
# there's no way to specify 'forced', as it's usually useless
self.rg.set_property("forced", True)
self.rg.set_property("reference-level", self.ref_lvl)
def _next_file(self):
"""Load the next file to analyze.
Returns False if everything is done and the pipeline shouldn't be
started again; True otherwise.
"""
# only when there already is a source
if hasattr(self, "src"):
self.src.unlink(self.decbin)
self.pipe.remove(self.src)
# set the next file
try:
fname = self._files_iter.next()
except StopIteration:
self.emit("all-finished", self.track_data, self.album_data)
return False
# make a new src element
self.src = gst.element_factory_make("filesrc", "src")
self.src.set_property("location", to_utf8(fname))
self._current_file = fname
self.pipe.add(self.src)
self.src.link(self.decbin)
self.rg.set_property("num-tracks", 1)
self.emit("track-started", to_utf8(fname))
return True
def _process_tags(self, msg):
"""Process a tag message."""
tags = msg.parse_tag()
trackdata = self.track_data.setdefault(self._current_file, GainData(0))
# process just every tag
for tag in tags.keys():
if tag == gst.TAG_TRACK_GAIN:
trackdata.gain = tags[tag]
elif tag == gst.TAG_TRACK_PEAK:
trackdata.peak = tags[tag]
elif tag == GST_TAG_REFERENCE_LEVEL:
trackdata.ref_level = tags[tag]
elif tag == gst.TAG_ALBUM_GAIN:
self.album_data.gain = tags[tag]
elif tag == gst.TAG_ALBUM_PEAK:
self.album_data.peak = tags[tag]
# event handlers
def _on_pad_added(self, decbin, new_pad):
try:
decbin.link(self.conv)
except gst.LinkError:
# this one didn't work. Hopefully the next try's better
pass
def _on_pad_removed(self, decbin, old_pad):
decbin.unlink(self.conv)
def _on_message(self, bus, msg):
if msg.type == gst.MESSAGE_TAG:
if not msg.src == self.rg:
return
self._process_tags(msg)
elif msg.type == gst.MESSAGE_EOS:
self.emit("track-finished", to_utf8(self._current_file),
self.track_data[self._current_file])
self.rg.set_locked_state(True)
self.pipe.set_state(gst.STATE_NULL)
ret = self._next_file()
if ret:
self.rg.set_locked_state(False)
self.pipe.set_state(gst.STATE_PLAYING)
def calculate(*args, **kwargs):
"""Analyze some files.
This is only a convenience interface to the ``ReplayGain`` class: it takes
the same arguments, but setups its own main loop and returns the results
once everything's finished.
"""
def on_finished(evsrc, trackdata, albumdata):
# all done
loop.quit()
rg = ReplayGain(*args, **kwargs)
rg.connect("all-finished", on_finished)
loop = gobject.MainLoop()
rg.start()
loop.run()
return (rg.track_data, rg.album_data)
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