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#!/usr/bin/env python3
"""Show how slow-sync clients work."""
import time
import jack
slow = jack.Client('Slow')
slow.pos = 0
slow.ready_at = None
slow.seek_time = 0.1
@slow.set_sync_callback
def slow_sync_callback(state, pos):
now = time.time()
print(jack.TransportState(state), pos.frame, end=' ')
if state == jack.STOPPED:
if slow.pos == pos.frame:
print('ready')
return True
if slow.ready_at is None:
slow.ready_at = now + slow.seek_time
if slow.ready_at < now:
print('just got ready')
slow.pos = pos.frame
slow.ready_at = None
return True
print('will be ready in {:.2f} seconds'.format(slow.ready_at - now))
elif state == jack.STARTING:
if slow.pos == pos.frame:
print('ready')
return True
if slow.ready_at is None:
slow.ready_at = now + slow.seek_time
if slow.ready_at < now:
print('just got ready')
slow.pos = pos.frame
slow.ready_at = None
return True
print('will be ready in {:.2f} seconds'.format(slow.ready_at - now))
return False
elif state == jack.ROLLING:
assert slow.pos != pos.frame
assert slow.ready_at is not None
if slow.ready_at < now:
print('just caught up')
slow.pos = pos.frame
slow.ready_at = None
return True
print('will catch up in {:.2f} seconds'.format(slow.ready_at - now))
return False
else:
assert False
return False
# Make sure transport is stopped and at 0 initially
slow.transport_stop()
slow.transport_frame = 0
print('== setting custom sync timeout')
slow.set_sync_timeout(int(0.5 * slow.seek_time * 1000 * 1000))
with slow:
time.sleep(0.1) # Time to show STOPPED
print('== starting transport')
slow.transport_start()
time.sleep(0.1) # Time to show STARTING
print('== stopping transport')
slow.transport_stop()
print('== seeking to 123')
slow.transport_frame = 123
time.sleep(0.5 * slow.seek_time)
print('== starting transport')
slow.transport_start()
time.sleep(slow.seek_time)
print('== stopping transport')
slow.transport_stop()
print('== setting default sync timeout')
slow.set_sync_timeout(2 * 1000 * 1000)
print('== seeking to 123')
slow.transport_frame = 123
time.sleep(0.5 * slow.seek_time)
print('== starting transport')
slow.transport_start()
time.sleep(slow.seek_time)
slow.transport_stop()
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