# the following code makes popcorn.Player deadlocked:
import kaa
from kaa import popcorn
player=popcorn.Player()
audio1="/home/tpfly/audio/06hh.wma"
@kaa.coroutine()
def test():
yield player.open(audio1,player="mplayer")
player.pause() # this line causes the problem
print "starting playback..."
yield player.play()
player.resume()
print "enjoy the music......"
yield kaa.delay(10)
yield player.stop()
print "player stopped"
test()
kaa.main.run()
# end
Calling player.pause() before player.play() causes the play inprogress
won't finish and the playback won't start,
and the mplayer process won't start either.
Maybe we should prevent from calling the methods in this sequence, but
the events usually come from user interface, one could occasionally
press pause button before playback starts, and I think it's the
player's responsibility to keep reliable and robust.
The problem is in generic.py, in decorator required_states:
if self._get_state() in states and not self._pending:
# already finished
return kaa.InProgress().execute(func, self, *args, **kwargs)
# add callback to list of pending calls
async = kaa.InProgress()
callback = kaa.Callable(func, self, *args, **kwargs)
self._pending.append((states, async, callback))
return async
when calling play(), self._get_state() is already STATE_OPEN, but
there is a pending operation 'pause' in self._pending waiting
STATE_PLAY or STATE_PAUSED, so the play operation is added to
self._pending too and will never play anything.
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