How to continuously monitor rhythmbox for track change using python revisited

dbus, python, rhythmbox

Solution

This works with Rhythmbox 3. I changed it to write the current song to a file ( ~/.now_playing ) but you can update it for your needs:

#!/usr/bin/python

import dbus
import dbus.mainloop.glib
import glib

# This gets called whenever Rhythmbox sends the playingUriChanged signal
def playing_song_changed (Player,two,three):
    global iface
    global track
    global home
    track2 = iface.Get(Player,"Metadata").get(dbus.String(u'xesam:artist'))[0] + " - "+ iface.Get(Player,"Metadata").get(dbus.String(u'xesam:title'))

    if track != track2:
        track = iface.Get(Player,"Metadata").get(dbus.String(u'xesam:artist'))[0] + " - "+ iface.Get(Player,"Metadata").get(dbus.String(u'xesam:title'))
        f = open( home + '/.now_playing', 'w' )
        f.write( track + '\n' )
        f.close()


dbus.mainloop.glib.DBusGMainLoop (set_as_default = True)

bus = dbus.SessionBus ()
from os.path import expanduser
home = expanduser("~")
player = bus.get_object ("org.mpris.MediaPlayer2.rhythmbox", "/org/mpris/MediaPlayer2")
iface = dbus.Interface (player, "org.freedesktop.DBus.Properties")

track = iface.Get("org.mpris.MediaPlayer2.Player","Metadata").get(dbus.String(u'xesam:artist'))[0] + " - "+ iface.Get("org.mpris.MediaPlayer2.Player","Metadata").get(dbus.Strin$
f = open( home + "/.now_playing", 'w' )
f.write( track + '\n' )
f.close()

iface.connect_to_signal ("PropertiesChanged", playing_song_changed)

# Run the GLib event loop to process DBus signals as they arrive
mainloop = glib.MainLoop ()
mainloop.run ()

Problem

Running the following Python code from this SO answer ``` #!/usr/bin/python import dbus import dbus.mainloop.glib import glib # This gets called whenever Rhythmbox sends the playingUriChanged signal def playing_song_changed (uri): global shell if uri != "": song = shell.getSongProperties (uri) print "Now playing: {0}".format (song["title"]) else: print "Not playing anything" dbus.mainloop.glib.DBusGMainLoop (set_as_default = True) bus = dbus.SessionBus () proxy = bus.get_object ("org.gnome.Rhythmbox", "/org/gnome/Rhythmbox/Player") player = dbus.Interface (proxy, "org.gnome.Rhythmbox.Player") player.connect_to_signal ("playingUriChanged", playing_song_changed) proxy = bus.get_object ("org.gnome.Rhythmbox", "/org/gnome/Rhythmbox/Shell") shell = dbus.Interface (proxy, "org.gnome.Rhythmbox.Shell") # Run the GLib event loop to process DBus signals as they arrive mainloop = glib.MainLoop () mainloop.run () ``` on both Ubuntu 12.04 and 14.04 gets me the following error: ``` Traceback (most recent call last): File "./test.py", line 20, in <module> proxy = bus.get_object ("org.gnome.Rhythmbox", "/org/gnome/Rhythmbox/Player") File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object follow_name_owner_changes=follow_name_owner_changes) File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__ self._named_service = conn.activate_name_owner(bus_name) File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner self.start_service_by_name(bus_name) File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name 'su', (bus_name, flags))) File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking message, timeout) dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Rhythmbox was not provided by any .service files ``` What am I doing wrong? Or alternatively if there's a another way to listen to DBUS signals on Python that would also help.

Original source

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