media_control.py

#!/usr/bin/python3
import dbus, dbus.mainloop.glib, sys
from gi.repository import GLib
import datetime
from math import floor

track_dur = 0

def on_property_changed(interface, changed, invalidated):
    global track_dur
    if interface != 'org.bluez.MediaPlayer1':
        return
    for prop, value in changed.items():
        if prop == 'Position':
            print('Position: {}/{}s'.format(str(datetime.timedelta(seconds=floor(value/1000)))[2:],str(datetime.timedelta(seconds=track_dur/1000))[2:]))
        elif prop == 'Status':
            print('Playback Status: {}'.format(value))
        elif prop == 'Track':
            print('Music Info:')
            track_dur = value.get('Duration','')
            for key in ('Title', 'Artist', 'Album'):
                print('   {}: {}'.format(key, value.get(key, '')))
 
def on_playback_control(fd, condition):
    str = fd.readline()
    if str.startswith('play'):
        player_iface.Play()
    elif str.startswith('pause'):
        player_iface.Pause()
    elif str.startswith('next'):
        player_iface.Next()
    elif str.startswith('prev'):
        player_iface.Previous()
    return True

if __name__ == '__main__':
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
    bus = dbus.SystemBus()
    obj = bus.get_object('org.bluez', "/")

    mgr = dbus.Interface(obj, 'org.freedesktop.DBus.ObjectManager')

    for path, ifaces in mgr.GetManagedObjects().items():
        adapter = ifaces.get('org.bluez.MediaPlayer1')
        if not adapter:
            continue
        player = bus.get_object('org.bluez',path)
        player_iface = dbus.Interface(
                player,
                dbus_interface='org.bluez.MediaPlayer1')
        break
    if not adapter:
        sys.exit('Error: Media Player not found.')

    device_props = dbus.Interface(player_iface,"org.freedesktop.DBus.Properties")
    track_props = device_props.Get("org.bluez.MediaPlayer1","Track")
    track_dur = track_props.get('Duration','')

    bus.add_signal_receiver(
            on_property_changed,
            bus_name='org.bluez',
            signal_name='PropertiesChanged',
            dbus_interface='org.freedesktop.DBus.Properties')
    GLib.io_add_watch(sys.stdin, GLib.IO_IN, on_playback_control)
    GLib.MainLoop().run()