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import threading
import pydub
import time
from transitions.extensions import HierarchicalMachine as Machine
import os.path
from .lock import Lock
from . import Config, gain, debug_print, error_print
from .mixer import Mixer
file_lock = Lock("file")
class MusicFile(Machine):
def __init__(self, filename, mapping, name = None, gain = 1):
states = [
'initial',
'loading',
'failed',
{ 'name': 'loaded', 'children': ['stopped', 'playing', 'paused', 'stopping'] }
]
transitions = [
{ 'trigger': 'load', 'source': 'initial', 'dest': 'loading'},
{ 'trigger': 'fail', 'source': 'loading', 'dest': 'failed'},
{ 'trigger': 'success', 'source': 'loading', 'dest': 'loaded_stopped'},
{ 'trigger': 'start_playing', 'source': 'loaded_stopped', 'dest': 'loaded_playing'},
{ 'trigger': 'pause', 'source': 'loaded_playing', 'dest': 'loaded_paused'},
{ 'trigger': 'unpause', 'source': 'loaded_paused', 'dest': 'loaded_playing'},
{ 'trigger': 'stop_playing', 'source': ['loaded_playing','loaded_paused'], 'dest': 'loaded_stopping'},
{ 'trigger': 'stopped', 'source': 'loaded_stopping', 'dest': 'loaded_stopped', 'after': 'trigger_stopped_events'}
]
Machine.__init__(self, states=states, transitions=transitions, initial='initial')
self.volume = 100
self.mapping = mapping
self.filename = filename
self.name = name or filename
self.audio_segment = None
self.audio_segment_frame_width = 0
self.volume_factor = gain
self.music_lock = Lock("music__" + filename)
self.wait_event = threading.Event()
threading.Thread(name = "MSMusicLoad", target = self.load).start()
def on_enter_loading(self):
with file_lock:
try:
debug_print("Loading « {} »".format(self.name))
self.mixer = self.mapping.mixer or Mixer()
db_gain = gain(self.volume_factor * 100)
self.audio_segment = pydub.AudioSegment.from_file(self.filename).set_frame_rate(Config.frame_rate).set_channels(Config.channels).set_sample_width(Config.sample_width).apply_gain(db_gain)
self.audio_segment_frame_width = self.audio_segment.frame_width
self.sound_duration = self.audio_segment.duration_seconds
except Exception as e:
error_print("failed to load « {} »: {}".format(self.name, e))
self.loading_error = e
self.fail()
else:
self.success()
debug_print("Loaded « {} »".format(self.name))
def check_is_loaded(self):
return self.state.startswith('loaded_')
def is_not_stopped(self):
return self.check_is_loaded() and not self.is_loaded_stopped()
def is_paused(self):
return self.is_loaded_paused()
@property
def sound_position(self):
if self.is_not_stopped():
return self.current_frame / self.current_audio_segment.frame_rate
else:
return 0
def play(self, fade_in = 0, volume = 100, loop = 0, start_at = 0):
db_gain = gain(volume) + self.mapping.master_gain
self.volume = volume
self.loop = loop
ms = int(start_at * 1000)
ms_fi = int(fade_in * 1000)
with self.music_lock:
self.current_audio_segment = (self.audio_segment + db_gain)
self.current_frame = int(start_at * self.audio_segment.frame_rate)
if ms_fi > 0:
# FIXME: apply it to repeated when looping?
self.a_s_with_effect = self.current_audio_segment[ms:ms+ms_fi].fade_in(ms_fi)
self.current_frame_with_effect = 0
else:
self.a_s_with_effect = None
self.start_playing()
def on_enter_loaded_playing(self):
self.mixer.add_file(self)
def finished_callback(self):
if self.is_loaded_playing():
self.stop_playing()
if self.is_loaded_stopping():
self.stopped()
def trigger_stopped_events(self):
self.mixer.remove_file(self)
self.wait_event.set()
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.loop != 0:
self.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
threading.Thread(name = "MSFinishedCallback", target=self.finished_callback).start()
return data.ljust(out_data_length, b'\0')
def get_next_sample(self, frame_count):
fw = self.audio_segment_frame_width
data = b""
nb_frames = 0
if self.a_s_with_effect is not None:
segment = self.a_s_with_effect
max_val = int(segment.frame_count())
start_i = max(self.current_frame_with_effect, 0)
end_i = min(self.current_frame_with_effect + frame_count, max_val)
data += segment._data[(start_i * fw):(end_i * fw)]
frame_count = max(0, self.current_frame_with_effect + frame_count - max_val)
self.current_frame_with_effect += end_i - start_i
self.current_frame += end_i - start_i
nb_frames += end_i - start_i
if frame_count > 0:
self.a_s_with_effect = None
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
return [data, nb_frames]
def seek(self, value = 0, delta = False):
# We don't want to do that while stopping
if not (self.is_loaded_playing() or self.is_loaded_paused()):
return
with self.music_lock:
self.a_s_with_effect = None
self.current_frame = max(0, int(delta) * self.current_frame + int(value * self.audio_segment.frame_rate))
# FIXME: si on fait un seek + delta, adapter le "loop"
def stop(self, fade_out = 0, wait = False):
if self.is_loaded_playing():
ms = int(self.sound_position * 1000)
ms_fo = max(1, int(fade_out * 1000))
new_audio_segment = self.current_audio_segment[:ms + ms_fo].fade_out(ms_fo)
with self.music_lock:
self.current_audio_segment = new_audio_segment
self.stop_playing()
if wait:
self.wait_end()
else:
self.stop_playing()
self.stopped()
def set_gain(self, db_gain):
if not self.is_not_stopped():
return
new_audio_segment = self.current_audio_segment + db_gain
new_a_s_with_effect = None
if self.a_s_with_effect is not None:
new_a_s_with_effect = self.a_s_with_effect + db_gain
with self.music_lock:
self.current_audio_segment = new_audio_segment
self.a_s_with_effect = new_a_s_with_effect
def set_volume(self, value, delta = False):
[db_gain, self.volume] = gain(value + int(delta) * self.volume, self.volume)
self.set_gain(db_gain)
def wait_end(self):
self.wait_event.clear()
self.wait_event.wait()
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