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#!/usr/bin/env python3
# -*- Python -*-
import sys
sys.path.insert(0, '..')
del sys
import select
from pyalsa import alsahcontrol
def parse_event_mask(events):
if events == 0:
return 'None'
if events == alsahcontrol.event_mask_remove:
return 'Removed'
s = ''
for i in alsahcontrol.event_mask.keys():
if events & alsahcontrol.event_mask[i]:
s += '%s ' % i
return s[:-1]
def event_callback(element, events):
info = alsahcontrol.Info(element)
value = alsahcontrol.Value(element)
print('CALLBACK (DEF)! [%s] %s:%i' % (parse_event_mask(events), element.name, element.index))
print(' ', value.get_tuple(info.type, info.count))
class MyElementEvent:
def callback(self, element, events):
info = alsahcontrol.Info(element)
value = alsahcontrol.Value(element)
print('CALLBACK (CLASS)! [%s] %s:%i' % (parse_event_mask(events), element.name, element.index))
print(' ', value.get_tuple(info.type, info.count))
hctl = alsahcontrol.HControl(name='hw:0', mode=alsahcontrol.open_mode['NONBLOCK'])
list = hctl.list()
element1 = alsahcontrol.Element(hctl, list[0][1:])
element1.set_callback(event_callback)
element2 = alsahcontrol.Element(hctl, list[1][1:])
element2.set_callback(MyElementEvent())
nelementid = (alsahcontrol.interface_id['MIXER'], 0, 0, "Z Test Volume", 1)
try:
hctl.element_remove(nelementid)
except IOError:
pass
hctl.element_new(alsahcontrol.element_type['INTEGER'],
nelementid, 2, 0, 100, 1)
hctl.element_unlock(nelementid)
# handleEvents() must be here to update internal alsa-lib's element list
hctl.handle_events()
element3 = alsahcontrol.Element(hctl, nelementid)
element3.set_callback(event_callback)
print('Watching (DEF): %s,%i' % (element1.name, element1.index))
print('Watching (CLASS): %s,%i' % (element2.name, element2.index))
print('Watching (DEF): %s,%i' % (element3.name, element3.index))
poller = select.poll()
hctl.register_poll(poller)
while True:
poller.poll()
print('Poll OK!')
hctl.handle_events()
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