+ # Let other subscribe for an event when they are ready
+ def subscribe_loaded(self, callback):
+ # FIXME: should lock to be sure we have no race, but it makes the
+ # initialization screen not showing until everything is loaded
+ if self.is_loaded(allow_substates=True):
+ callback(True)
+ elif self.is_failed():
+ callback(False)
+ else:
+ self.loaded_callbacks.append(callback)
+
+ def poll_loaded(self):
+ for callback in self.loaded_callbacks:
+ callback(self.is_loaded())
+ self.loaded_callbacks = []
+
+ # Callbacks
+ def finished_callback(self):
+ self.stopped()
+
+ def play_callback(self, out_data_length, frame_count):
+ if self.is_loaded_paused():
+ return b'\0' * out_data_length
+
+ with self.music_lock:
+ [data, nb_frames] = self.get_next_sample(frame_count)
+ if nb_frames < frame_count:
+ if self.is_loaded_playing() and\
+ self.current_loop < self.last_loop:
+ self.current_loop += 1
+ self.current_frame = 0
+ [new_data, new_nb_frames] = self.get_next_sample(
+ frame_count - nb_frames)
+ data += new_data
+ nb_frames += new_nb_frames
+ elif nb_frames == 0:
+ # FIXME: too slow when mixing multiple streams
+ threading.Thread(
+ name="MSFinishedCallback",
+ target=self.finished_callback).start()
+
+ return data.ljust(out_data_length, b'\0')
+
+ # Helpers
+ def set_gain(self, db_gain, absolute=False):
+ if absolute:
+ self.db_gain = db_gain
+ else:
+ self.db_gain += db_gain
+
+ def get_next_sample(self, frame_count):
+ fw = self.audio_segment.frame_width
+
+ data = b""
+ nb_frames = 0
+
+ segment = self.current_audio_segment
+ max_val = int(segment.frame_count())
+
+ start_i = max(self.current_frame, 0)
+ end_i = min(self.current_frame + frame_count, max_val)
+ data += segment._data[start_i*fw : end_i*fw]
+ nb_frames += end_i - start_i
+ self.current_frame += end_i - start_i
+
+ volume_factor = self.volume_factor(self.effects_next_gain(nb_frames))
+
+ data = audioop.mul(data, Config.sample_width, volume_factor)
+
+ return [data, nb_frames]
+
+ def add_fade_effect(self, db_gain, fade_duration):
+ if not self.is_in_use():
+ return
+
+ self.gain_effects.append(GainEffect(
+ "fade",
+ self.current_audio_segment,
+ self.current_loop,
+ self.sound_position,
+ self.sound_position + fade_duration,
+ gain=db_gain))
+
+ def effects_next_gain(self, frame_count):
+ db_gain = 0
+ for gain_effect in self.gain_effects:
+ [new_gain, last_gain] = gain_effect.get_next_gain(
+ self.current_frame,
+ self.current_loop,
+ frame_count)
+ if last_gain:
+ self.set_gain(new_gain)
+ self.gain_effects.remove(gain_effect)
+ else:
+ db_gain += new_gain
+ return db_gain