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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(Machine): | |
18 | def __init__(self, filename, mapping, name=None, gain=1): | |
19 | states = [ | |
20 | 'initial', | |
21 | 'loading', | |
22 | 'failed', | |
23 | { | |
24 | 'name': 'loaded', | |
25 | 'children': ['stopped', 'playing', 'paused', 'stopping'] | |
26 | } | |
27 | ] | |
28 | transitions = [ | |
29 | { | |
30 | 'trigger': 'load', | |
31 | 'source': 'initial', | |
32 | 'dest': 'loading' | |
33 | }, | |
34 | { | |
35 | 'trigger': 'fail', | |
36 | 'source': 'loading', | |
37 | 'dest': 'failed' | |
38 | }, | |
39 | { | |
40 | 'trigger': 'success', | |
41 | 'source': 'loading', | |
42 | 'dest': 'loaded_stopped' | |
43 | }, | |
44 | { | |
45 | 'trigger': 'start_playing', | |
46 | 'source': 'loaded_stopped', | |
47 | 'dest': 'loaded_playing' | |
48 | }, | |
49 | { | |
50 | 'trigger': 'pause', | |
51 | 'source': 'loaded_playing', | |
52 | 'dest': 'loaded_paused' | |
53 | }, | |
54 | { | |
55 | 'trigger': 'unpause', | |
56 | 'source': 'loaded_paused', | |
57 | 'dest': 'loaded_playing' | |
58 | }, | |
59 | { | |
60 | 'trigger': 'stop_playing', | |
61 | 'source': ['loaded_playing','loaded_paused'], | |
62 | 'dest': 'loaded_stopping' | |
63 | }, | |
64 | { | |
65 | 'trigger': 'stopped', | |
66 | 'source': 'loaded_stopping', | |
67 | 'dest': 'loaded_stopped', | |
68 | 'after': 'trigger_stopped_events' | |
69 | } | |
70 | ] | |
71 | ||
72 | Machine.__init__(self, states=states, | |
73 | transitions=transitions, initial='initial') | |
74 | ||
75 | self.volume = 100 | |
76 | self.mapping = mapping | |
77 | self.filename = filename | |
78 | self.name = name or filename | |
79 | self.audio_segment = None | |
80 | self.audio_segment_frame_width = 0 | |
81 | self.initial_volume_factor = gain | |
82 | self.music_lock = Lock("music__" + filename) | |
83 | self.wait_event = threading.Event() | |
84 | self.db_gain = 0 | |
85 | self.gain_effects = [] | |
86 | ||
87 | threading.Thread(name="MSMusicLoad", target=self.load).start() | |
88 | ||
89 | def on_enter_loading(self): | |
90 | with file_lock: | |
91 | try: | |
92 | debug_print("Loading « {} »".format(self.name)) | |
93 | self.mixer = self.mapping.mixer or Mixer() | |
94 | initial_db_gain = gain(self.initial_volume_factor * 100) | |
95 | self.audio_segment = pydub.AudioSegment \ | |
96 | .from_file(self.filename) \ | |
97 | .set_frame_rate(Config.frame_rate) \ | |
98 | .set_channels(Config.channels) \ | |
99 | .set_sample_width(Config.sample_width) \ | |
100 | .apply_gain(initial_db_gain) | |
101 | self.audio_segment_frame_width = self.audio_segment.frame_width | |
102 | self.sound_duration = self.audio_segment.duration_seconds | |
103 | except Exception as e: | |
104 | error_print("failed to load « {} »: {}".format(self.name, e)) | |
105 | self.loading_error = e | |
106 | self.fail() | |
107 | else: | |
108 | self.success() | |
109 | debug_print("Loaded « {} »".format(self.name)) | |
110 | ||
111 | def check_is_loaded(self): | |
112 | return self.state.startswith('loaded_') | |
113 | ||
114 | def is_not_stopped(self): | |
115 | return self.check_is_loaded() and not self.is_loaded_stopped() | |
116 | ||
117 | def is_paused(self): | |
118 | return self.is_loaded_paused() | |
119 | ||
120 | @property | |
121 | def sound_position(self): | |
122 | if self.is_not_stopped(): | |
123 | return self.current_frame / self.current_audio_segment.frame_rate | |
124 | else: | |
125 | return 0 | |
126 | ||
127 | def play(self, fade_in=0, volume=100, loop=0, start_at=0): | |
128 | self.set_gain(gain(volume) + self.mapping.master_gain, absolute=True) | |
129 | self.volume = volume | |
130 | self.current_loop = 0 | |
131 | self.loop_left = loop | |
132 | ||
133 | with self.music_lock: | |
134 | self.current_audio_segment = self.audio_segment | |
135 | self.current_frame = int(start_at * self.audio_segment.frame_rate) | |
136 | if fade_in > 0: | |
137 | db_gain = gain(self.volume, 0)[0] | |
138 | self.set_gain(-db_gain) | |
139 | self.gain_effects.append(GainEffect( | |
140 | "fade", | |
141 | self.current_audio_segment, | |
142 | self.current_loop, | |
143 | self.sound_position, | |
144 | self.sound_position + fade_in, | |
145 | gain=db_gain)) | |
146 | ||
147 | self.start_playing() | |
148 | ||
149 | def on_enter_loaded_playing(self): | |
150 | self.mixer.add_file(self) | |
151 | ||
152 | def finished_callback(self): | |
153 | if self.is_loaded_playing(): | |
154 | self.stop_playing() | |
155 | if self.is_loaded_stopping(): | |
156 | self.stopped() | |
157 | ||
158 | def trigger_stopped_events(self): | |
159 | self.mixer.remove_file(self) | |
160 | self.wait_event.set() | |
161 | ||
162 | def play_callback(self, out_data_length, frame_count): | |
163 | if self.is_loaded_paused(): | |
164 | return b'\0' * out_data_length | |
165 | ||
166 | with self.music_lock: | |
167 | [data, nb_frames] = self.get_next_sample(frame_count) | |
168 | if nb_frames < frame_count: | |
169 | if self.is_loaded_playing() and self.loop_left != 0: | |
170 | self.loop_left -= 1 | |
171 | self.current_loop += 1 | |
172 | self.current_frame = 0 | |
173 | [new_data, new_nb_frames] = self.get_next_sample( | |
174 | frame_count - nb_frames) | |
175 | data += new_data | |
176 | nb_frames += new_nb_frames | |
177 | elif nb_frames == 0: | |
178 | # FIXME: too slow | |
179 | threading.Thread( | |
180 | name="MSFinishedCallback", | |
181 | target=self.finished_callback).start() | |
182 | ||
183 | return data.ljust(out_data_length, b'\0') | |
184 | ||
185 | def get_next_sample(self, frame_count): | |
186 | fw = self.audio_segment_frame_width | |
187 | ||
188 | data = b"" | |
189 | nb_frames = 0 | |
190 | ||
191 | segment = self.current_audio_segment | |
192 | max_val = int(segment.frame_count()) | |
193 | ||
194 | start_i = max(self.current_frame, 0) | |
195 | end_i = min(self.current_frame + frame_count, max_val) | |
196 | data += segment._data[start_i*fw : end_i*fw] | |
197 | nb_frames += end_i - start_i | |
198 | self.current_frame += end_i - start_i | |
199 | ||
200 | volume_factor = self.volume_factor(self.effects_next_gain(nb_frames)) | |
201 | ||
202 | data = audioop.mul(data, Config.sample_width, volume_factor) | |
203 | ||
204 | return [data, nb_frames] | |
205 | ||
206 | def seek(self, value=0, delta=False): | |
207 | # We don't want to do that while stopping | |
208 | if not (self.is_loaded_playing() or self.is_loaded_paused()): | |
209 | return | |
210 | with self.music_lock: | |
211 | self.abandon_all_effects() | |
212 | self.current_frame = max( | |
213 | 0, | |
214 | int(delta) * self.current_frame | |
215 | + int(value * self.audio_segment.frame_rate)) | |
216 | # FIXME: si on fait un seek + delta, adapter le "loop" | |
217 | ||
218 | def effects_next_gain(self, frame_count): | |
219 | db_gain = 0 | |
220 | for gain_effect in self.gain_effects: | |
221 | [new_gain, last_gain] = gain_effect.get_next_gain( | |
222 | self.current_frame, | |
223 | self.current_loop, | |
224 | frame_count) | |
225 | if last_gain: | |
226 | self.set_gain(new_gain) | |
227 | self.gain_effects.remove(gain_effect) | |
228 | else: | |
229 | db_gain += new_gain | |
230 | return db_gain | |
231 | ||
232 | ||
233 | def abandon_all_effects(self): | |
234 | db_gain = 0 | |
235 | for gain_effect in self.gain_effects: | |
236 | db_gain += gain_effect.get_last_gain() | |
237 | ||
238 | self.gain_effects = [] | |
239 | self.set_gain(db_gain) | |
240 | ||
241 | def stop(self, fade_out=0, wait=False): | |
242 | if self.is_loaded_playing(): | |
243 | ms = int(self.sound_position * 1000) | |
244 | ms_fo = max(1, int(fade_out * 1000)) | |
245 | ||
246 | new_audio_segment = self.current_audio_segment[: ms+ms_fo] \ | |
247 | .fade_out(ms_fo) | |
248 | with self.music_lock: | |
249 | self.current_audio_segment = new_audio_segment | |
250 | self.stop_playing() | |
251 | if wait: | |
252 | self.wait_end() | |
253 | else: | |
254 | self.stop_playing() | |
255 | self.stopped() | |
256 | ||
257 | def volume_factor(self, additional_gain): | |
258 | return 10 ** ( (self.db_gain + additional_gain) / 20) | |
259 | ||
260 | def set_gain(self, db_gain, absolute=False): | |
261 | if absolute: | |
262 | self.db_gain = db_gain | |
263 | else: | |
264 | self.db_gain += db_gain | |
265 | ||
266 | def set_volume(self, value, delta=False, fade=0): | |
267 | [db_gain, self.volume] = gain( | |
268 | value + int(delta) * self.volume, | |
269 | self.volume) | |
270 | ||
271 | if fade > 0: | |
272 | self.gain_effects.append(GainEffect( | |
273 | "fade", | |
274 | self.current_audio_segment, | |
275 | self.current_loop, | |
276 | self.sound_position, | |
277 | self.sound_position + fade, | |
278 | gain=db_gain)) | |
279 | else: | |
280 | self.set_gain(db_gain) | |
281 | ||
282 | def wait_end(self): | |
283 | self.wait_event.clear() | |
284 | self.wait_event.wait() | |
285 |