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1 | import threading | |
2 | import pydub | |
3 | import time | |
4 | from transitions.extensions import HierarchicalMachine as Machine | |
5 | ||
6 | import os.path | |
7 | ||
8 | import audioop | |
9 | ||
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 | |
14 | ||
15 | file_lock = Lock("file") | |
16 | ||
17 | class MusicFile: | |
18 | STATES = [ | |
19 | 'initial', | |
20 | 'loading', | |
21 | 'failed', | |
22 | { | |
23 | 'name': 'loaded', | |
24 | 'children': [ | |
25 | 'playing', | |
26 | 'paused', | |
27 | 'stopping' | |
28 | ] | |
29 | } | |
30 | ] | |
31 | TRANSITIONS = [ | |
32 | { | |
33 | 'trigger': 'load', | |
34 | 'source': 'initial', | |
35 | 'dest': 'loading', | |
36 | 'after': 'poll_loaded' | |
37 | }, | |
38 | { | |
39 | 'trigger': 'fail', | |
40 | 'source': 'loading', | |
41 | 'dest': 'failed' | |
42 | }, | |
43 | { | |
44 | 'trigger': 'success', | |
45 | 'source': 'loading', | |
46 | 'dest': 'loaded' | |
47 | }, | |
48 | { | |
49 | 'trigger': 'start_playing', | |
50 | 'source': 'loaded', | |
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'] | |
55 | }, | |
56 | { | |
57 | 'trigger': 'pause', | |
58 | 'source': 'loaded_playing', | |
59 | 'dest': 'loaded_paused' | |
60 | }, | |
61 | { | |
62 | 'trigger': 'unpause', | |
63 | 'source': 'loaded_paused', | |
64 | 'dest': 'loaded_playing' | |
65 | }, | |
66 | { | |
67 | 'trigger': 'stop_playing', | |
68 | 'source': ['loaded_playing','loaded_paused'], | |
69 | 'dest': 'loaded_stopping' | |
70 | }, | |
71 | { | |
72 | 'trigger': 'stopped', | |
73 | 'source': '*', | |
74 | 'dest': 'loaded', | |
75 | 'before': 'trigger_stopped_events', | |
76 | 'conditions': ['is_in_use'] | |
77 | } | |
78 | ] | |
79 | ||
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) | |
84 | ||
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) | |
92 | ||
93 | threading.Thread(name="MSMusicLoad", target=self.load).start() | |
94 | ||
95 | # Machine related events | |
96 | def on_enter_loading(self): | |
97 | with file_lock: | |
98 | try: | |
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 | |
112 | self.fail() | |
113 | else: | |
114 | self.success() | |
115 | debug_print("Loaded « {} »".format(self.name)) | |
116 | ||
117 | def on_enter_loaded(self): | |
118 | self.gain_effects = [] | |
119 | self.set_gain(0, absolute=True) | |
120 | self.current_audio_segment = None | |
121 | self.volume = 100 | |
122 | self.wait_event = threading.Event() | |
123 | self.current_loop = 0 | |
124 | ||
125 | def on_enter_loaded_playing(self): | |
126 | self.mixer.add_file(self) | |
127 | ||
128 | # Machine related states | |
129 | def is_in_use(self): | |
130 | return self.is_loaded(allow_substates=True) and not self.is_loaded() | |
131 | ||
132 | def is_in_use_not_stopping(self): | |
133 | return self.is_loaded_playing() or self.is_loaded_paused() | |
134 | ||
135 | # Machine related triggers | |
136 | def trigger_stopped_events(self): | |
137 | self.mixer.remove_file(self) | |
138 | self.wait_event.set() | |
139 | ||
140 | # Actions and properties called externally | |
141 | @property | |
142 | def sound_position(self): | |
143 | if self.is_in_use(): | |
144 | return self.current_frame / self.current_audio_segment.frame_rate | |
145 | else: | |
146 | return 0 | |
147 | ||
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) | |
150 | self.volume = volume | |
151 | if loop < 0: | |
152 | self.last_loop = float('inf') | |
153 | else: | |
154 | self.last_loop = loop | |
155 | ||
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) | |
159 | ||
160 | self.start_playing() | |
161 | ||
162 | if fade_in > 0: | |
163 | db_gain = gain(self.volume, 0)[0] | |
164 | self.set_gain(-db_gain) | |
165 | self.add_fade_effect(db_gain, fade_in) | |
166 | ||
167 | def seek(self, value=0, delta=False): | |
168 | if not self.is_in_use_not_stopping(): | |
169 | return | |
170 | ||
171 | with self.music_lock: | |
172 | self.abandon_all_effects() | |
173 | if delta: | |
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 | |
189 | else: | |
190 | self.current_frame = max( | |
191 | 0, | |
192 | int(value * self.audio_segment.frame_rate)) | |
193 | ||
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)) | |
198 | ||
199 | new_audio_segment = self.current_audio_segment[: ms+ms_fo] \ | |
200 | .fade_out(ms_fo) | |
201 | with self.music_lock: | |
202 | self.current_audio_segment = new_audio_segment | |
203 | self.stop_playing() | |
204 | if wait: | |
205 | if set_wait_id is not None: | |
206 | self.mapping.add_wait_id(set_wait_id, self.wait_event) | |
207 | self.wait_end() | |
208 | else: | |
209 | self.stopped() | |
210 | ||
211 | def abandon_all_effects(self): | |
212 | db_gain = 0 | |
213 | for gain_effect in self.gain_effects: | |
214 | db_gain += gain_effect.get_last_gain() | |
215 | ||
216 | self.gain_effects = [] | |
217 | self.set_gain(db_gain) | |
218 | ||
219 | def set_volume(self, value, delta=False, fade=0): | |
220 | [db_gain, self.volume] = gain( | |
221 | value + int(delta) * self.volume, | |
222 | self.volume) | |
223 | ||
224 | self.set_gain_with_effect(db_gain, fade=fade) | |
225 | ||
226 | def set_gain_with_effect(self, db_gain, fade=0): | |
227 | if not self.is_in_use(): | |
228 | return | |
229 | ||
230 | if fade > 0: | |
231 | self.add_fade_effect(db_gain, fade) | |
232 | else: | |
233 | self.set_gain(db_gain) | |
234 | ||
235 | def wait_end(self): | |
236 | self.wait_event.clear() | |
237 | self.wait_event.wait() | |
238 | ||
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): | |
244 | callback(True) | |
245 | elif self.is_failed(): | |
246 | callback(False) | |
247 | else: | |
248 | self.loaded_callbacks.append(callback) | |
249 | ||
250 | def poll_loaded(self): | |
251 | for callback in self.loaded_callbacks: | |
252 | callback(self.is_loaded()) | |
253 | self.loaded_callbacks = [] | |
254 | ||
255 | # Callbacks | |
256 | def finished_callback(self): | |
257 | self.stopped() | |
258 | ||
259 | def play_callback(self, out_data_length, frame_count): | |
260 | if self.is_loaded_paused(): | |
261 | return b'\0' * out_data_length | |
262 | ||
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) | |
272 | data += new_data | |
273 | nb_frames += new_nb_frames | |
274 | elif nb_frames == 0: | |
275 | # FIXME: too slow when mixing multiple streams | |
276 | threading.Thread( | |
277 | name="MSFinishedCallback", | |
278 | target=self.finished_callback).start() | |
279 | ||
280 | return data.ljust(out_data_length, b'\0') | |
281 | ||
282 | # Helpers | |
283 | def set_gain(self, db_gain, absolute=False): | |
284 | if absolute: | |
285 | self.db_gain = db_gain | |
286 | else: | |
287 | self.db_gain += db_gain | |
288 | ||
289 | def get_next_sample(self, frame_count): | |
290 | fw = self.audio_segment.frame_width | |
291 | ||
292 | data = b"" | |
293 | nb_frames = 0 | |
294 | ||
295 | segment = self.current_audio_segment | |
296 | max_val = int(segment.frame_count()) | |
297 | ||
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 | |
303 | ||
304 | volume_factor = self.volume_factor(self.effects_next_gain(nb_frames)) | |
305 | ||
306 | data = audioop.mul(data, Config.sample_width, volume_factor) | |
307 | ||
308 | return [data, nb_frames] | |
309 | ||
310 | def add_fade_effect(self, db_gain, fade_duration): | |
311 | if not self.is_in_use(): | |
312 | return | |
313 | ||
314 | self.gain_effects.append(GainEffect( | |
315 | "fade", | |
316 | self.current_audio_segment, | |
317 | self.current_loop, | |
318 | self.sound_position, | |
319 | self.sound_position + fade_duration, | |
320 | gain=db_gain)) | |
321 | ||
322 | def effects_next_gain(self, frame_count): | |
323 | db_gain = 0 | |
324 | for gain_effect in self.gain_effects: | |
325 | [new_gain, last_gain] = gain_effect.get_next_gain( | |
326 | self.current_frame, | |
327 | self.current_loop, | |
328 | frame_count) | |
329 | if last_gain: | |
330 | self.set_gain(new_gain) | |
331 | self.gain_effects.remove(gain_effect) | |
332 | else: | |
333 | db_gain += new_gain | |
334 | return db_gain | |
335 | ||
336 | ||
337 | def volume_factor(self, additional_gain=0): | |
338 | return 10 ** ( (self.db_gain + additional_gain) / 20) | |
339 |