]>
git.immae.eu Git - perso/Immae/Projets/Python/MusicSampler.git/blob - helpers/music_file.py
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 def reload_properties(self
, name
=None, gain
=1):
96 self
.name
= name
or self
.filename
97 if gain
!= self
.initial_volume_factor
:
98 self
.initial_volume_factor
= gain
99 self
.reload_music_file()
101 def reload_music_file(self
):
104 debug_print("Reloading « {} »".format(self
.name
))
105 initial_db_gain
= gain(self
.initial_volume_factor
* 100)
106 self
.audio_segment
= pydub
.AudioSegment \
107 .from_file(Config
.music_path
+ self
.filename
) \
108 .set_frame_rate(Config
.frame_rate
) \
109 .set_channels(Config
.channels
) \
110 .set_sample_width(Config
.sample_width
) \
111 .apply_gain(initial_db_gain
)
112 except Exception as e
:
113 error_print("failed to reload « {} »: {}"\
114 .format(self
.name
, e
))
115 self
.loading_error
= e
118 debug_print("Reloaded « {} »".format(self
.name
))
120 # Machine related events
121 def on_enter_loading(self
):
124 debug_print("Loading « {} »".format(self
.name
))
125 self
.mixer
= self
.mapping
.mixer
or Mixer()
126 initial_db_gain
= gain(self
.initial_volume_factor
* 100)
127 self
.audio_segment
= pydub
.AudioSegment \
128 .from_file(Config
.music_path
+ self
.filename
) \
129 .set_frame_rate(Config
.frame_rate
) \
130 .set_channels(Config
.channels
) \
131 .set_sample_width(Config
.sample_width
) \
132 .apply_gain(initial_db_gain
)
133 self
.sound_duration
= self
.audio_segment
.duration_seconds
134 except Exception as e
:
135 error_print("failed to load « {} »: {}".format(self
.name
, e
))
136 self
.loading_error
= e
140 debug_print("Loaded « {} »".format(self
.name
))
142 def on_enter_loaded(self
):
146 self
.gain_effects
= []
147 self
.set_gain(0, absolute
=True)
148 self
.current_audio_segment
= None
150 self
.wait_event
= threading
.Event()
151 self
.current_loop
= 0
153 def on_enter_loaded_playing(self
):
154 self
.mixer
.add_file(self
)
156 # Machine related states
158 return self
.is_loaded(allow_substates
=True) and not self
.is_loaded()
160 def is_in_use_not_stopping(self
):
161 return self
.is_loaded_playing() or self
.is_loaded_paused()
163 # Machine related triggers
164 def trigger_stopped_events(self
):
165 self
.mixer
.remove_file(self
)
166 self
.wait_event
.set()
169 # Actions and properties called externally
171 def sound_position(self
):
173 return self
.current_frame
/ self
.current_audio_segment
.frame_rate
177 def play(self
, fade_in
=0, volume
=100, loop
=0, start_at
=0):
178 self
.set_gain(gain(volume
) + self
.mapping
.master_gain
, absolute
=True)
181 self
.last_loop
= float('inf')
183 self
.last_loop
= loop
185 with self
.music_lock
:
186 self
.current_audio_segment
= self
.audio_segment
187 self
.current_frame
= int(start_at
* self
.audio_segment
.frame_rate
)
192 db_gain
= gain(self
.volume
, 0)[0]
193 self
.set_gain(-db_gain
)
194 self
.add_fade_effect(db_gain
, fade_in
)
196 def seek(self
, value
=0, delta
=False):
197 if not self
.is_in_use_not_stopping():
200 with self
.music_lock
:
201 self
.abandon_all_effects()
203 frame_count
= int(self
.audio_segment
.frame_count())
204 frame_diff
= int(value
* self
.audio_segment
.frame_rate
)
205 self
.current_frame
+= frame_diff
206 while self
.current_frame
< 0:
207 self
.current_loop
-= 1
208 self
.current_frame
+= frame_count
209 while self
.current_frame
> frame_count
:
210 self
.current_loop
+= 1
211 self
.current_frame
-= frame_count
212 if self
.current_loop
< 0:
213 self
.current_loop
= 0
214 self
.current_frame
= 0
215 if self
.current_loop
> self
.last_loop
:
216 self
.current_loop
= self
.last_loop
217 self
.current_frame
= frame_count
219 self
.current_frame
= max(
221 int(value
* self
.audio_segment
.frame_rate
))
223 def stop(self
, fade_out
=0, wait
=False, set_wait_id
=None):
224 if self
.is_loaded_playing():
225 ms
= int(self
.sound_position
* 1000)
226 ms_fo
= max(1, int(fade_out
* 1000))
228 new_audio_segment
= self
.current_audio_segment
[: ms
+ms_fo
] \
230 with self
.music_lock
:
231 self
.current_audio_segment
= new_audio_segment
234 if set_wait_id
is not None:
235 self
.mapping
.add_wait_id(set_wait_id
, self
.wait_event
)
240 def abandon_all_effects(self
):
242 for gain_effect
in self
.gain_effects
:
243 db_gain
+= gain_effect
.get_last_gain()
245 self
.gain_effects
= []
246 self
.set_gain(db_gain
)
248 def set_volume(self
, value
, delta
=False, fade
=0):
249 [db_gain
, self
.volume
] = gain(
250 value
+ int(delta
) * self
.volume
,
253 self
.set_gain_with_effect(db_gain
, fade
=fade
)
255 def set_gain_with_effect(self
, db_gain
, fade
=0):
256 if not self
.is_in_use():
260 self
.add_fade_effect(db_gain
, fade
)
262 self
.set_gain(db_gain
)
265 self
.wait_event
.clear()
266 self
.wait_event
.wait()
268 # Let other subscribe for an event when they are ready
269 def subscribe_loaded(self
, callback
):
270 # FIXME: should lock to be sure we have no race, but it makes the
271 # initialization screen not showing until everything is loaded
272 if self
.is_loaded(allow_substates
=True):
274 elif self
.is_failed():
277 self
.loaded_callbacks
.append(callback
)
279 def poll_loaded(self
):
280 for callback
in self
.loaded_callbacks
:
281 callback(self
.is_loaded())
282 self
.loaded_callbacks
= []
285 def finished_callback(self
):
288 def play_callback(self
, out_data_length
, frame_count
):
289 if self
.is_loaded_paused():
290 return b
'\0' * out_data_length
292 with self
.music_lock
:
293 [data
, nb_frames
] = self
.get_next_sample(frame_count
)
294 if nb_frames
< frame_count
:
295 if self
.is_loaded_playing() and\
296 self
.current_loop
< self
.last_loop
:
297 self
.current_loop
+= 1
298 self
.current_frame
= 0
299 [new_data
, new_nb_frames
] = self
.get_next_sample(
300 frame_count
- nb_frames
)
302 nb_frames
+= new_nb_frames
304 # FIXME: too slow when mixing multiple streams
306 name
="MSFinishedCallback",
307 target
=self
.finished_callback
).start()
309 return data
.ljust(out_data_length
, b
'\0')
312 def set_gain(self
, db_gain
, absolute
=False):
314 self
.db_gain
= db_gain
316 self
.db_gain
+= db_gain
318 def get_next_sample(self
, frame_count
):
319 fw
= self
.audio_segment
.frame_width
324 segment
= self
.current_audio_segment
325 max_val
= int(segment
.frame_count())
327 start_i
= max(self
.current_frame
, 0)
328 end_i
= min(self
.current_frame
+ frame_count
, max_val
)
329 data
+= segment
._data
[start_i
*fw
: end_i
*fw
]
330 nb_frames
+= end_i
- start_i
331 self
.current_frame
+= end_i
- start_i
333 volume_factor
= self
.volume_factor(self
.effects_next_gain(nb_frames
))
335 data
= audioop
.mul(data
, Config
.sample_width
, volume_factor
)
337 return [data
, nb_frames
]
339 def add_fade_effect(self
, db_gain
, fade_duration
):
340 if not self
.is_in_use():
343 self
.gain_effects
.append(GainEffect(
345 self
.current_audio_segment
,
348 self
.sound_position
+ fade_duration
,
351 def effects_next_gain(self
, frame_count
):
353 for gain_effect
in self
.gain_effects
:
354 [new_gain
, last_gain
] = gain_effect
.get_next_gain(
359 self
.set_gain(new_gain
)
360 self
.gain_effects
.remove(gain_effect
)
366 def volume_factor(self
, additional_gain
=0):
367 return 10 ** ( (self
.db_gain
+ additional_gain
) / 20)