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volume-watcher.py
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volume-watcher.py
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#!/usr/bin/python
import os
import sys
import signal
import logging
import logging.handlers
import dbus
import dbus.service
import dbus.mainloop.glib
try:
import gobject
except ImportError:
from gi.repository import GObject as gobject
LOG_LEVEL = logging.INFO
#LOG_LEVEL = logging.DEBUG
LOG_FILE = "/dev/log"
LOG_FORMAT = "%(asctime)s %(levelname)s %(message)s"
BLUEZ_DEV = "org.bluez.MediaTransport1"
def device_property_changed_cb(property_name, value, path, interface, device_path):
global bus
if property_name != BLUEZ_DEV:
return
device = dbus.Interface(bus.get_object("org.bluez", device_path), "org.freedesktop.DBus.Properties")
properties = device.GetAll(BLUEZ_DEV)
logger.info("Getting dbus interface for device: %s interface: %s property_name: %s" % (device_path, interface, property_name))
vol = properties["Volume"]
volume_percentage = format(vol / 1.27, '.2f')
logger.info("Detected volume change: {} ({})".format(vol, volume_percentage) )
cmd = "amixer cset numid=3 {}%".format(volume_percentage)
logger.info("Running cmd: {}".format(cmd))
os.system(cmd)
def shutdown(signum, frame):
mainloop.quit()
if __name__ == "__main__":
# shut down on a TERM signal
signal.signal(signal.SIGTERM, shutdown)
# start logging
logger = logging.getLogger("volume-watcher")
logger.setLevel(LOG_LEVEL)
logger.addHandler(logging.handlers.SysLogHandler(address = "/dev/log"))
logger.info("Starting to monitor for AVRCP Volume changes")
# Get the system bus
try:
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
bus = dbus.SystemBus()
except Exception as ex:
logger.error("Unable to get the system dbus: '{0}'. Exiting. Is dbus running?".format(ex.message))
sys.exit(1)
# listen for signals on the Bluez bus
bus.add_signal_receiver(device_property_changed_cb, bus_name="org.bluez", signal_name="PropertiesChanged", path_keyword="device_path", interface_keyword="interface")
try:
mainloop = gobject.MainLoop()
mainloop.run()
except KeyboardInterrupt:
pass
except:
logger.error("Unable to run the gobject main loop")
sys.exit(1)
logger.info("Shutting down")
sys.exit(0)