python-push-to-talk.py

from Xlib.display import Display
from Xlib import X
from Xlib.ext import record
from Xlib.protocol import rq
from subprocess import call

disp = None

call(["pacmd", "set-source-mute", "1", "true"])

def handler(reply):
    """ This function is called when a xlib event is fired """
    data = reply.data
    while len(data):
        event, data = rq.EventField(None).parse_binary_value(data, disp.display, None, None)

        # KEYCODE IS FOUND USERING event.detail
        #print "EVT: %s | %s " % (event.detail, str(event))
        print event.detail

        if event.type == X.KeyPress or event.type == X.ButtonPress:
            # BUTTON PRESSED
            print "pressed"
            if event.detail == 9:
                call(["pacmd", "set-source-mute", "1", "false"])
        elif event.type == X.KeyRelease or event.type == X.ButtonRelease:
            # BUTTON RELEASED
            print "released"
            if event.detail == 9:
                call(["pacmd", "set-source-mute", "1", "true"])

# get current display
disp = Display()
root = disp.screen().root

# Monitor keypress and button press
ctx = disp.record_create_context(
            0,
            [record.AllClients],
            [{
                    'core_requests': (0, 0),
                    'core_replies': (0, 0),
                    'ext_requests': (0, 0, 0, 0),
                    'ext_replies': (0, 0, 0, 0),
                    'delivered_events': (0, 0),
                    'device_events': (X.KeyReleaseMask, X.ButtonReleaseMask),
                    'errors': (0, 0),
                    'client_started': False,
                    'client_died': False,
            }])
disp.record_enable_context(ctx, handler)
disp.record_free_context(ctx)

while 1:
    # Infinite wait, doesn't do anything as no events are grabbed
    event = root.display.next_event()

call(["pacmd", "set-source-mute", "1", "false"])