mocp-mpris

#!/usr/bin/env python3
# Author: Jan Larres <jan@majutsushi.net>
# License: MIT/X11
#
# References:
# https://github.com/mopidy/mopidy-mpris/blob/develop/mopidy_mpris/objects.py
# https://dbus.freedesktop.org/doc/dbus-python/doc/tutorial.html
# https://gist.github.com/caspian311/4676061

import dbus
from dbus.mainloop.glib import DBusGMainLoop
import dbus.service
from gi.repository import GLib
import re
import signal
from subprocess import call, check_output, STDOUT, CalledProcessError
import sys

BUS_NAME = 'org.mpris.MediaPlayer2.mocp'
OBJECT_PATH = '/org/mpris/MediaPlayer2'
ROOT_IFACE = 'org.mpris.MediaPlayer2'
PLAYER_IFACE = 'org.mpris.MediaPlayer2.Player'
PLAYLISTS_IFACE = 'org.mpris.MediaPlayer2.Playlists'

class Mocp(dbus.service.Object):
    def __init__(self):
        bus_name = dbus.service.BusName(BUS_NAME, dbus.SessionBus())
        dbus.service.Object.__init__(self, bus_name, OBJECT_PATH)
        self.loop = GLib.MainLoop()

    def run(self):
        self.loop.run()

    @dbus.service.method(dbus_interface=dbus.PROPERTIES_IFACE,
                         in_signature='ss', out_signature='v')
    def Get(self, interface, prop):
        if prop == 'PlaybackStatus':
            state = get_mocp_state()
            if state == 'UNKNOWN' or state == 'STOP':
                return 'Stopped'
            if state == 'PLAY':
                return 'Playing'
            elif state == 'PAUSE':
                return 'Paused'
            else:
                return 'Stopped'

        return 'Not implemented'

    @dbus.service.method(dbus_interface=ROOT_IFACE)
    def Quit(self):
        sys.exit(0)

    @dbus.service.method(dbus_interface=PLAYER_IFACE)
    def PlayPause(self):
        state = get_mocp_state()

        if state == 'UNKNOWN' or state == 'STOP':
            return

        mocp_cmd(['--toggle-pause'])

def mocp_cmd(args):
    return check_output(['mocp'] + args, stderr=STDOUT).decode('utf-8')

def get_mocp_state():
    try:
        out = mocp_cmd(['-i'])
    except CalledProcessError as e:
        return 'UNKNOWN'
    for line in out.splitlines():
        match = re.match('^State: (.*)', line)
        if match:
            return match.group(1)

    # STOP, PLAY, PAUSE
    return 'UNKNOWN'

def main():
    DBusGMainLoop(set_as_default=True)

    Mocp().run()

if __name__ == '__main__':
    sys.exit(main())