]>
git.immae.eu Git - perso/Immae/Projets/Python/MusicSampler.git/blob - helpers/music_file.py
a972bc5bc965b9a59634897587e807640d24725b
4 from transitions
.extensions
import HierarchicalMachine
as Machine
10 from .lock
import Lock
11 from . import Config
, gain
, debug_print
, error_print
12 from .mixer
import Mixer
13 from .music_effect
import GainEffect
15 file_lock
= Lock("file")
36 'after': 'poll_loaded'
49 'trigger': 'start_playing',
51 'dest': 'loaded_playing',
52 # if a child has no transitions, then it is bubbled to the parent,
53 # and we don't want that. Not useful in that machine precisely.
54 'conditions': ['is_loaded']
58 'source': 'loaded_playing',
59 'dest': 'loaded_paused'
63 'source': 'loaded_paused',
64 'dest': 'loaded_playing'
67 'trigger': 'stop_playing',
68 'source': ['loaded_playing','loaded_paused'],
69 'dest': 'loaded_stopping'
75 'before': 'trigger_stopped_events',
76 'conditions': ['is_in_use']
80 def __init__(self
, filename
, mapping
, name
=None, gain
=1):
81 Machine(model
=self
, states
=self
.STATES
,
82 transitions
=self
.TRANSITIONS
, initial
='initial',
83 ignore_invalid_triggers
=True)
85 self
.loaded_callbacks
= []
86 self
.mapping
= mapping
87 self
.filename
= filename
88 self
.name
= name
or filename
89 self
.audio_segment
= None
90 self
.initial_volume_factor
= gain
91 self
.music_lock
= Lock("music__" + filename
)
93 threading
.Thread(name
="MSMusicLoad", target
=self
.load
).start()
95 # Machine related events
96 def on_enter_loading(self
):
99 debug_print("Loading « {} »".format(self
.name
))
100 self
.mixer
= self
.mapping
.mixer
or Mixer()
101 initial_db_gain
= gain(self
.initial_volume_factor
* 100)
102 self
.audio_segment
= pydub
.AudioSegment \
103 .from_file(self
.filename
) \
104 .set_frame_rate(Config
.frame_rate
) \
105 .set_channels(Config
.channels
) \
106 .set_sample_width(Config
.sample_width
) \
107 .apply_gain(initial_db_gain
)
108 self
.sound_duration
= self
.audio_segment
.duration_seconds
109 except Exception as e
:
110 error_print("failed to load « {} »: {}".format(self
.name
, e
))
111 self
.loading_error
= e
115 debug_print("Loaded « {} »".format(self
.name
))
117 def on_enter_loaded(self
):
118 self
.gain_effects
= []
119 self
.set_gain(0, absolute
=True)
120 self
.current_audio_segment
= None
122 self
.wait_event
= threading
.Event()
123 self
.current_loop
= 0
125 def on_enter_loaded_playing(self
):
126 self
.mixer
.add_file(self
)
128 # Machine related states
130 return self
.is_loaded(allow_substates
=True) and not self
.is_loaded()
132 def is_in_use_not_stopping(self
):
133 return self
.is_loaded_playing() or self
.is_loaded_paused()
135 # Machine related triggers
136 def trigger_stopped_events(self
):
137 self
.mixer
.remove_file(self
)
138 self
.wait_event
.set()
140 # Actions and properties called externally
142 def sound_position(self
):
144 return self
.current_frame
/ self
.current_audio_segment
.frame_rate
148 def play(self
, fade_in
=0, volume
=100, loop
=0, start_at
=0):
149 self
.set_gain(gain(volume
) + self
.mapping
.master_gain
, absolute
=True)
152 self
.last_loop
= float('inf')
154 self
.last_loop
= loop
156 with self
.music_lock
:
157 self
.current_audio_segment
= self
.audio_segment
158 self
.current_frame
= int(start_at
* self
.audio_segment
.frame_rate
)
163 db_gain
= gain(self
.volume
, 0)[0]
164 self
.set_gain(-db_gain
)
165 self
.add_fade_effect(db_gain
, fade_in
)
167 def seek(self
, value
=0, delta
=False):
168 if not self
.is_in_use_not_stopping():
171 with self
.music_lock
:
172 self
.abandon_all_effects()
174 frame_count
= int(self
.audio_segment
.frame_count())
175 frame_diff
= int(value
* self
.audio_segment
.frame_rate
)
176 self
.current_frame
+= frame_diff
177 while self
.current_frame
< 0:
178 self
.current_loop
-= 1
179 self
.current_frame
+= frame_count
180 while self
.current_frame
> frame_count
:
181 self
.current_loop
+= 1
182 self
.current_frame
-= frame_count
183 if self
.current_loop
< 0:
184 self
.current_loop
= 0
185 self
.current_frame
= 0
186 if self
.current_loop
> self
.last_loop
:
187 self
.current_loop
= self
.last_loop
188 self
.current_frame
= frame_count
190 self
.current_frame
= max(
192 int(value
* self
.audio_segment
.frame_rate
))
194 def stop(self
, fade_out
=0, wait
=False, set_wait_id
=None):
195 if self
.is_loaded_playing():
196 ms
= int(self
.sound_position
* 1000)
197 ms_fo
= max(1, int(fade_out
* 1000))
199 new_audio_segment
= self
.current_audio_segment
[: ms
+ms_fo
] \
201 with self
.music_lock
:
202 self
.current_audio_segment
= new_audio_segment
205 if set_wait_id
is not None:
206 self
.mapping
.add_wait_id(set_wait_id
, self
.wait_event
)
211 def abandon_all_effects(self
):
213 for gain_effect
in self
.gain_effects
:
214 db_gain
+= gain_effect
.get_last_gain()
216 self
.gain_effects
= []
217 self
.set_gain(db_gain
)
219 def set_volume(self
, value
, delta
=False, fade
=0):
220 [db_gain
, self
.volume
] = gain(
221 value
+ int(delta
) * self
.volume
,
224 self
.set_gain_with_effect(db_gain
, fade
=fade
)
226 def set_gain_with_effect(self
, db_gain
, fade
=0):
227 if not self
.is_in_use():
231 self
.add_fade_effect(db_gain
, fade
)
233 self
.set_gain(db_gain
)
236 self
.wait_event
.clear()
237 self
.wait_event
.wait()
239 # Let other subscribe for an event when they are ready
240 def subscribe_loaded(self
, callback
):
241 # FIXME: should lock to be sure we have no race, but it makes the
242 # initialization screen not showing until everything is loaded
243 if self
.is_loaded(allow_substates
=True):
245 elif self
.is_failed():
248 self
.loaded_callbacks
.append(callback
)
250 def poll_loaded(self
):
251 for callback
in self
.loaded_callbacks
:
252 callback(self
.is_loaded())
253 self
.loaded_callbacks
= []
256 def finished_callback(self
):
259 def play_callback(self
, out_data_length
, frame_count
):
260 if self
.is_loaded_paused():
261 return b
'\0' * out_data_length
263 with self
.music_lock
:
264 [data
, nb_frames
] = self
.get_next_sample(frame_count
)
265 if nb_frames
< frame_count
:
266 if self
.is_loaded_playing() and\
267 self
.current_loop
< self
.last_loop
:
268 self
.current_loop
+= 1
269 self
.current_frame
= 0
270 [new_data
, new_nb_frames
] = self
.get_next_sample(
271 frame_count
- nb_frames
)
273 nb_frames
+= new_nb_frames
275 # FIXME: too slow when mixing multiple streams
277 name
="MSFinishedCallback",
278 target
=self
.finished_callback
).start()
280 return data
.ljust(out_data_length
, b
'\0')
283 def set_gain(self
, db_gain
, absolute
=False):
285 self
.db_gain
= db_gain
287 self
.db_gain
+= db_gain
289 def get_next_sample(self
, frame_count
):
290 fw
= self
.audio_segment
.frame_width
295 segment
= self
.current_audio_segment
296 max_val
= int(segment
.frame_count())
298 start_i
= max(self
.current_frame
, 0)
299 end_i
= min(self
.current_frame
+ frame_count
, max_val
)
300 data
+= segment
._data
[start_i
*fw
: end_i
*fw
]
301 nb_frames
+= end_i
- start_i
302 self
.current_frame
+= end_i
- start_i
304 volume_factor
= self
.volume_factor(self
.effects_next_gain(nb_frames
))
306 data
= audioop
.mul(data
, Config
.sample_width
, volume_factor
)
308 return [data
, nb_frames
]
310 def add_fade_effect(self
, db_gain
, fade_duration
):
311 if not self
.is_in_use():
314 self
.gain_effects
.append(GainEffect(
316 self
.current_audio_segment
,
319 self
.sound_position
+ fade_duration
,
322 def effects_next_gain(self
, frame_count
):
324 for gain_effect
in self
.gain_effects
:
325 [new_gain
, last_gain
] = gain_effect
.get_next_gain(
330 self
.set_gain(new_gain
)
331 self
.gain_effects
.remove(gain_effect
)
337 def volume_factor(self
, additional_gain
=0):
338 return 10 ** ( (self
.db_gain
+ additional_gain
) / 20)