def checkTransport(self):
pos = jacklib.jack_position_t()
pos.valid = 0
state = jacklib.transport_query(jack_client, jacklib.pointer(pos))
if self.will_trig:
if pos.beat == pos.beats_per_bar:
if (pos.ticks_per_beat - pos.tick) <= 4:
# we are at 4 ticks or less from next bar (arbitrary)
# so we send a trig message to sooperlooper.
server.send(self.sl_url, '/sl/-1/hit', 'trigger')
self.will_trig = False
return
if (self.transport_playing and state == jacklib.JackTransportStopped):
if self.will_trig:
self.will_trig = False
else:
server.send(self.sl_url, '/sl/-1/hit', 'pause_on')
self.transport_playing = False
elif (not self.transport_playing
and state == jacklib.JackTransportRolling):
if pos.beat == 1 and pos.tick == 0:
server.send(self.sl_url, '/sl/-1/hit', 'trigger')
else:
self.will_trig = True
self.transport_playing = True
status = jacklib.jack_status_t()
client = jacklib.client_open("transport-query", jacklib.JackNoStartServer,
status)
err = get_jack_status_error_string(status)
if status.value:
if status.value & jacklib.JackNameNotUnique:
print("Non-fatal JACK status: %s" % err, file=sys.stderr)
elif status.value & jacklib.JackServerStarted:
# Should not happen, since we use the JackNoStartServer option
print("Unexpected JACK status: %s" % err, file=sys.stderr)
else:
sys.exit("Error connecting to JACK server: %s" % err)
position = jacklib.jack_position_t()
transport_state = jacklib.transport_query(client, pointer(position))
for name, type_ in sorted(position._fields_):
value = getattr(position, name)
if name == 'padding':
value = list(value)
print("{}: {}".format(name, value), file=sys.stderr)
if transport_state == jacklib.JackTransportStopped:
print("JACK transport stopped, starting it now.")
jacklib.transport_start(client)
elif transport_state == jacklib.JackTransportRolling:
print("JACK transport rolling, stopping it now.")
jacklib.transport_stop(client)
elif transport_state == jacklib.JackTransportStarting:
print("JACK transport starting, nothing to do.")
def transport_query(self, position=None):
return jacklib.transport_query(self.client, position)