def _on_node_change(self, voice_player, name, old, new):
if old is None or new is None:
# only trigger other voices when moving to a different node
return
node = voice_player._current_node
voice_players = self.voice_players
for voice, weight_sum, transition_weights in (
self.track.get_transition_weights(node, 'Trigger')
):
if voice is voice_player.voice:
# Do not let voices trigger themselves.
continue
transition = choose_transition(weight_sum, transition_weights)
target_voice_player = voice_players[voice]
if node is transition.target_node:
target_voice_player._current_node = None
target_voice_player._current_node = transition.target_node
target_voice_player.time = voice_player.time
target_voice_player.phrase_player.play()
def iter(self):
phrase_player = self.phrase_player
# Start with the voice's start node. This will also set the phrase
# player's phrase to the node's phrase.
self._current_node = self.voice.start_node
phrase_player.play()
while True:
# Wait until there is a phrase to be played back
if phrase_player.phrase is None:
yield None
# Exit the loop if the voice player has been stopped
if not self.playing:
break
continue
try:
yield phrase_player.play_iter.next()
except StopIteration:
# The phrase player has finished its phrase or was stopped.
# Exit the loop if the voice player has been stopped.
if not self.playing:
break
# Choose the next phrase transition.
transition = choose_transition(
*self.track.get_voice_transition_weights(
self._current_node, 'Phrase', self.voice
)
)
if transition is None:
# If there is no transition for the current voice,
# try to get a transition for all voices.
transition = choose_transition(
*self.track.get_voice_transition_weights(
self._current_node, 'Phrase', None
)
)
if transition is None:
next_node = None
else:
# Set the node to be played back next. This will also set
# the phrase player's phrase to the new node's phrase.
next_node = transition.target_node
self._current_node = next_node
phrase_player.play()
if next_node is None or next_node.phrase is None:
# If there is no phrase to be played, update the
# externally visible node attribute immediately for we
# don't have a chance to do so later on (the else-branch
# below will not be reached in this case).
self.current_node = next_node
else:
# Check if the node has been changed, so we can now tell
# observers to do their stuff while the first note of the
# new node is already being played.
if self.current_node is not self._current_node:
self.current_node = self._current_node
phrase_player.current_point = None
self._current_node = None
self.current_node = None
self.time = -1
