src/gb/audio.c (view raw)
1/* Copyright (c) 2013-2016 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include <mgba/internal/gb/audio.h>
7
8#include <mgba/core/blip_buf.h>
9#include <mgba/core/interface.h>
10#include <mgba/core/sync.h>
11#include <mgba/internal/gb/gb.h>
12#include <mgba/internal/gb/serialize.h>
13#include <mgba/internal/gb/io.h>
14
15#ifdef _3DS
16#define blip_add_delta blip_add_delta_fast
17#endif
18
19#define FRAME_CYCLES (DMG_LR35902_FREQUENCY >> 9)
20
21const uint32_t DMG_LR35902_FREQUENCY = 0x400000;
22static const int CLOCKS_PER_BLIP_FRAME = 0x1000;
23static const unsigned BLIP_BUFFER_SIZE = 0x4000;
24const int GB_AUDIO_VOLUME_MAX = 0x100;
25
26static bool _writeSweep(struct GBAudioSweep* sweep, uint8_t value);
27static void _writeDuty(struct GBAudioEnvelope* envelope, uint8_t value);
28static bool _writeEnvelope(struct GBAudioEnvelope* envelope, uint8_t value, enum GBAudioStyle style);
29
30static void _resetSweep(struct GBAudioSweep* sweep);
31static bool _resetEnvelope(struct GBAudioEnvelope* sweep);
32
33static void _updateEnvelope(struct GBAudioEnvelope* envelope);
34static void _updateEnvelopeDead(struct GBAudioEnvelope* envelope);
35static bool _updateSweep(struct GBAudioSquareChannel* sweep, bool initial);
36
37static void _updateSquareSample(struct GBAudioSquareChannel* ch);
38static int32_t _updateSquareChannel(struct GBAudioSquareChannel* ch);
39
40static int8_t _coalesceNoiseChannel(struct GBAudioNoiseChannel* ch);
41
42static void _updateFrame(struct mTiming* timing, void* user, uint32_t cyclesLate);
43static void _updateChannel1(struct mTiming* timing, void* user, uint32_t cyclesLate);
44static void _updateChannel2(struct mTiming* timing, void* user, uint32_t cyclesLate);
45static void _updateChannel3(struct mTiming* timing, void* user, uint32_t cyclesLate);
46static void _fadeChannel3(struct mTiming* timing, void* user, uint32_t cyclesLate);
47static void _updateChannel4(struct mTiming* timing, void* user, uint32_t cyclesLate);
48static void _sample(struct mTiming* timing, void* user, uint32_t cyclesLate);
49
50void GBAudioInit(struct GBAudio* audio, size_t samples, uint8_t* nr52, enum GBAudioStyle style) {
51 audio->samples = samples;
52 audio->left = blip_new(BLIP_BUFFER_SIZE);
53 audio->right = blip_new(BLIP_BUFFER_SIZE);
54 audio->clockRate = DMG_LR35902_FREQUENCY;
55 // Guess too large; we hang producing extra samples if we guess too low
56 blip_set_rates(audio->left, DMG_LR35902_FREQUENCY, 96000);
57 blip_set_rates(audio->right, DMG_LR35902_FREQUENCY, 96000);
58 audio->forceDisableCh[0] = false;
59 audio->forceDisableCh[1] = false;
60 audio->forceDisableCh[2] = false;
61 audio->forceDisableCh[3] = false;
62 audio->masterVolume = GB_AUDIO_VOLUME_MAX;
63 audio->nr52 = nr52;
64 audio->style = style;
65 if (style == GB_AUDIO_GBA) {
66 audio->timingFactor = 4;
67 } else {
68 audio->timingFactor = 1;
69 }
70
71 audio->frameEvent.context = audio;
72 audio->frameEvent.name = "GB Audio Frame Sequencer";
73 audio->frameEvent.callback = _updateFrame;
74 audio->frameEvent.priority = 0x10;
75 audio->ch1Event.context = audio;
76 audio->ch1Event.name = "GB Audio Channel 1";
77 audio->ch1Event.callback = _updateChannel1;
78 audio->ch1Event.priority = 0x11;
79 audio->ch2Event.context = audio;
80 audio->ch2Event.name = "GB Audio Channel 2";
81 audio->ch2Event.callback = _updateChannel2;
82 audio->ch2Event.priority = 0x12;
83 audio->ch3Event.context = audio;
84 audio->ch3Event.name = "GB Audio Channel 3";
85 audio->ch3Event.callback = _updateChannel3;
86 audio->ch3Event.priority = 0x13;
87 audio->ch3Fade.context = audio;
88 audio->ch3Fade.name = "GB Audio Channel 3 Memory";
89 audio->ch3Fade.callback = _fadeChannel3;
90 audio->ch3Fade.priority = 0x14;
91 audio->ch4Event.context = audio;
92 audio->ch4Event.name = "GB Audio Channel 4";
93 audio->ch4Event.callback = _updateChannel4;
94 audio->ch4Event.priority = 0x15;
95 audio->sampleEvent.context = audio;
96 audio->sampleEvent.name = "GB Audio Sample";
97 audio->sampleEvent.callback = _sample;
98 audio->ch1Event.priority = 0x18;
99}
100
101void GBAudioDeinit(struct GBAudio* audio) {
102 blip_delete(audio->left);
103 blip_delete(audio->right);
104}
105
106void GBAudioReset(struct GBAudio* audio) {
107 mTimingDeschedule(audio->timing, &audio->frameEvent);
108 mTimingDeschedule(audio->timing, &audio->ch1Event);
109 mTimingDeschedule(audio->timing, &audio->ch2Event);
110 mTimingDeschedule(audio->timing, &audio->ch3Event);
111 mTimingDeschedule(audio->timing, &audio->ch3Fade);
112 mTimingDeschedule(audio->timing, &audio->ch4Event);
113 mTimingDeschedule(audio->timing, &audio->sampleEvent);
114 if (audio->style != GB_AUDIO_GBA) {
115 mTimingSchedule(audio->timing, &audio->sampleEvent, 0);
116 }
117 if (audio->style == GB_AUDIO_GBA) {
118 mTimingSchedule(audio->timing, &audio->frameEvent, 0);
119 }
120 audio->ch1 = (struct GBAudioSquareChannel) { .envelope = { .dead = 2 } };
121 audio->ch2 = (struct GBAudioSquareChannel) { .envelope = { .dead = 2 } };
122 audio->ch3 = (struct GBAudioWaveChannel) { .bank = 0 };
123 audio->ch4 = (struct GBAudioNoiseChannel) { .nSamples = 0 };
124 // TODO: DMG randomness
125 audio->ch3.wavedata8[0] = 0x00;
126 audio->ch3.wavedata8[1] = 0xFF;
127 audio->ch3.wavedata8[2] = 0x00;
128 audio->ch3.wavedata8[3] = 0xFF;
129 audio->ch3.wavedata8[4] = 0x00;
130 audio->ch3.wavedata8[5] = 0xFF;
131 audio->ch3.wavedata8[6] = 0x00;
132 audio->ch3.wavedata8[7] = 0xFF;
133 audio->ch3.wavedata8[8] = 0x00;
134 audio->ch3.wavedata8[9] = 0xFF;
135 audio->ch3.wavedata8[10] = 0x00;
136 audio->ch3.wavedata8[11] = 0xFF;
137 audio->ch3.wavedata8[12] = 0x00;
138 audio->ch3.wavedata8[13] = 0xFF;
139 audio->ch3.wavedata8[14] = 0x00;
140 audio->ch3.wavedata8[15] = 0xFF;
141 audio->ch4 = (struct GBAudioNoiseChannel) { .envelope = { .dead = 2 } };
142 audio->frame = 0;
143 audio->sampleInterval = 128;
144 audio->lastLeft = 0;
145 audio->lastRight = 0;
146 audio->capLeft = 0;
147 audio->capRight = 0;
148 audio->clock = 0;
149 audio->playingCh1 = false;
150 audio->playingCh2 = false;
151 audio->playingCh3 = false;
152 audio->playingCh4 = false;
153 if (audio->p && audio->p->model != GB_MODEL_SGB) {
154 audio->playingCh1 = true;
155 audio->enable = true;
156 *audio->nr52 |= 0x01;
157 }
158}
159
160void GBAudioResizeBuffer(struct GBAudio* audio, size_t samples) {
161 mCoreSyncLockAudio(audio->p->sync);
162 audio->samples = samples;
163 blip_clear(audio->left);
164 blip_clear(audio->right);
165 audio->clock = 0;
166 mCoreSyncConsumeAudio(audio->p->sync);
167}
168
169void GBAudioWriteNR10(struct GBAudio* audio, uint8_t value) {
170 if (!_writeSweep(&audio->ch1.sweep, value)) {
171 mTimingDeschedule(audio->timing, &audio->ch1Event);
172 audio->playingCh1 = false;
173 *audio->nr52 &= ~0x0001;
174 }
175}
176
177void GBAudioWriteNR11(struct GBAudio* audio, uint8_t value) {
178 _writeDuty(&audio->ch1.envelope, value);
179 audio->ch1.control.length = 64 - audio->ch1.envelope.length;
180}
181
182void GBAudioWriteNR12(struct GBAudio* audio, uint8_t value) {
183 if (!_writeEnvelope(&audio->ch1.envelope, value, audio->style)) {
184 mTimingDeschedule(audio->timing, &audio->ch1Event);
185 audio->playingCh1 = false;
186 *audio->nr52 &= ~0x0001;
187 }
188}
189
190void GBAudioWriteNR13(struct GBAudio* audio, uint8_t value) {
191 audio->ch1.control.frequency &= 0x700;
192 audio->ch1.control.frequency |= GBAudioRegisterControlGetFrequency(value);
193}
194
195void GBAudioWriteNR14(struct GBAudio* audio, uint8_t value) {
196 audio->ch1.control.frequency &= 0xFF;
197 audio->ch1.control.frequency |= GBAudioRegisterControlGetFrequency(value << 8);
198 bool wasStop = audio->ch1.control.stop;
199 audio->ch1.control.stop = GBAudioRegisterControlGetStop(value << 8);
200 if (!wasStop && audio->ch1.control.stop && audio->ch1.control.length && !(audio->frame & 1)) {
201 --audio->ch1.control.length;
202 if (audio->ch1.control.length == 0) {
203 mTimingDeschedule(audio->timing, &audio->ch1Event);
204 audio->playingCh1 = false;
205 }
206 }
207 if (GBAudioRegisterControlIsRestart(value << 8)) {
208 audio->playingCh1 = _resetEnvelope(&audio->ch1.envelope);
209
210 if (audio->playingCh1) {
211 _updateSquareSample(&audio->ch1);
212 }
213
214 audio->ch1.sweep.realFrequency = audio->ch1.control.frequency;
215 _resetSweep(&audio->ch1.sweep);
216 if (audio->playingCh1 && audio->ch1.sweep.shift) {
217 audio->playingCh1 = _updateSweep(&audio->ch1, true);
218 }
219 if (!audio->ch1.control.length) {
220 audio->ch1.control.length = 64;
221 if (audio->ch1.control.stop && !(audio->frame & 1)) {
222 --audio->ch1.control.length;
223 }
224 }
225 if (audio->playingCh1 && audio->ch1.envelope.dead != 2 && !mTimingIsScheduled(audio->timing, &audio->ch1Event)) {
226 mTimingSchedule(audio->timing, &audio->ch1Event, 0);
227 }
228 }
229 *audio->nr52 &= ~0x0001;
230 *audio->nr52 |= audio->playingCh1;
231}
232
233void GBAudioWriteNR21(struct GBAudio* audio, uint8_t value) {
234 _writeDuty(&audio->ch2.envelope, value);
235 audio->ch2.control.length = 64 - audio->ch2.envelope.length;
236}
237
238void GBAudioWriteNR22(struct GBAudio* audio, uint8_t value) {
239 if (!_writeEnvelope(&audio->ch2.envelope, value, audio->style)) {
240 mTimingDeschedule(audio->timing, &audio->ch2Event);
241 audio->playingCh2 = false;
242 *audio->nr52 &= ~0x0002;
243 }
244}
245
246void GBAudioWriteNR23(struct GBAudio* audio, uint8_t value) {
247 audio->ch2.control.frequency &= 0x700;
248 audio->ch2.control.frequency |= GBAudioRegisterControlGetFrequency(value);
249}
250
251void GBAudioWriteNR24(struct GBAudio* audio, uint8_t value) {
252 audio->ch2.control.frequency &= 0xFF;
253 audio->ch2.control.frequency |= GBAudioRegisterControlGetFrequency(value << 8);
254 bool wasStop = audio->ch2.control.stop;
255 audio->ch2.control.stop = GBAudioRegisterControlGetStop(value << 8);
256 if (!wasStop && audio->ch2.control.stop && audio->ch2.control.length && !(audio->frame & 1)) {
257 --audio->ch2.control.length;
258 if (audio->ch2.control.length == 0) {
259 mTimingDeschedule(audio->timing, &audio->ch2Event);
260 audio->playingCh2 = false;
261 }
262 }
263 if (GBAudioRegisterControlIsRestart(value << 8)) {
264 audio->playingCh2 = _resetEnvelope(&audio->ch2.envelope);
265
266 if (audio->playingCh2) {
267 _updateSquareSample(&audio->ch2);
268 }
269
270 if (!audio->ch2.control.length) {
271 audio->ch2.control.length = 64;
272 if (audio->ch2.control.stop && !(audio->frame & 1)) {
273 --audio->ch2.control.length;
274 }
275 }
276 if (audio->playingCh2 && audio->ch2.envelope.dead != 2 && !mTimingIsScheduled(audio->timing, &audio->ch2Event)) {
277 mTimingSchedule(audio->timing, &audio->ch2Event, 0);
278 }
279 }
280 *audio->nr52 &= ~0x0002;
281 *audio->nr52 |= audio->playingCh2 << 1;
282}
283
284void GBAudioWriteNR30(struct GBAudio* audio, uint8_t value) {
285 audio->ch3.enable = GBAudioRegisterBankGetEnable(value);
286 if (!audio->ch3.enable) {
287 audio->playingCh3 = false;
288 *audio->nr52 &= ~0x0004;
289 }
290}
291
292void GBAudioWriteNR31(struct GBAudio* audio, uint8_t value) {
293 audio->ch3.length = 256 - value;
294}
295
296void GBAudioWriteNR32(struct GBAudio* audio, uint8_t value) {
297 audio->ch3.volume = GBAudioRegisterBankVolumeGetVolumeGB(value);
298}
299
300void GBAudioWriteNR33(struct GBAudio* audio, uint8_t value) {
301 audio->ch3.rate &= 0x700;
302 audio->ch3.rate |= GBAudioRegisterControlGetRate(value);
303}
304
305void GBAudioWriteNR34(struct GBAudio* audio, uint8_t value) {
306 audio->ch3.rate &= 0xFF;
307 audio->ch3.rate |= GBAudioRegisterControlGetRate(value << 8);
308 bool wasStop = audio->ch3.stop;
309 audio->ch3.stop = GBAudioRegisterControlGetStop(value << 8);
310 if (!wasStop && audio->ch3.stop && audio->ch3.length && !(audio->frame & 1)) {
311 --audio->ch3.length;
312 if (audio->ch3.length == 0) {
313 audio->playingCh3 = false;
314 }
315 }
316 bool wasEnable = audio->playingCh3;
317 if (GBAudioRegisterControlIsRestart(value << 8)) {
318 audio->playingCh3 = audio->ch3.enable;
319 if (!audio->ch3.length) {
320 audio->ch3.length = 256;
321 if (audio->ch3.stop && !(audio->frame & 1)) {
322 --audio->ch3.length;
323 }
324 }
325
326 if (audio->style == GB_AUDIO_DMG && wasEnable && audio->playingCh3 && audio->ch3.readable) {
327 if (audio->ch3.window < 8) {
328 audio->ch3.wavedata8[0] = audio->ch3.wavedata8[audio->ch3.window >> 1];
329 } else {
330 audio->ch3.wavedata8[0] = audio->ch3.wavedata8[((audio->ch3.window >> 1) & ~3)];
331 audio->ch3.wavedata8[1] = audio->ch3.wavedata8[((audio->ch3.window >> 1) & ~3) + 1];
332 audio->ch3.wavedata8[2] = audio->ch3.wavedata8[((audio->ch3.window >> 1) & ~3) + 2];
333 audio->ch3.wavedata8[3] = audio->ch3.wavedata8[((audio->ch3.window >> 1) & ~3) + 3];
334 }
335 }
336 audio->ch3.window = 0;
337 audio->ch3.sample = 0;
338 }
339 mTimingDeschedule(audio->timing, &audio->ch3Fade);
340 mTimingDeschedule(audio->timing, &audio->ch3Event);
341 if (audio->playingCh3) {
342 audio->ch3.readable = audio->style != GB_AUDIO_DMG;
343 // TODO: Where does this cycle delay come from?
344 mTimingSchedule(audio->timing, &audio->ch3Event, audio->timingFactor * 4 + 2 * (2048 - audio->ch3.rate));
345 }
346 *audio->nr52 &= ~0x0004;
347 *audio->nr52 |= audio->playingCh3 << 2;
348}
349
350void GBAudioWriteNR41(struct GBAudio* audio, uint8_t value) {
351 _writeDuty(&audio->ch4.envelope, value);
352 audio->ch4.length = 64 - audio->ch4.envelope.length;
353}
354
355void GBAudioWriteNR42(struct GBAudio* audio, uint8_t value) {
356 if (!_writeEnvelope(&audio->ch4.envelope, value, audio->style)) {
357 mTimingDeschedule(audio->timing, &audio->ch4Event);
358 audio->playingCh4 = false;
359 *audio->nr52 &= ~0x0008;
360 }
361}
362
363void GBAudioWriteNR43(struct GBAudio* audio, uint8_t value) {
364 audio->ch4.ratio = GBAudioRegisterNoiseFeedbackGetRatio(value);
365 audio->ch4.frequency = GBAudioRegisterNoiseFeedbackGetFrequency(value);
366 audio->ch4.power = GBAudioRegisterNoiseFeedbackGetPower(value);
367}
368
369void GBAudioWriteNR44(struct GBAudio* audio, uint8_t value) {
370 bool wasStop = audio->ch4.stop;
371 audio->ch4.stop = GBAudioRegisterNoiseControlGetStop(value);
372 if (!wasStop && audio->ch4.stop && audio->ch4.length && !(audio->frame & 1)) {
373 --audio->ch4.length;
374 if (audio->ch4.length == 0) {
375 mTimingDeschedule(audio->timing, &audio->ch4Event);
376 audio->playingCh4 = false;
377 }
378 }
379 if (GBAudioRegisterNoiseControlIsRestart(value)) {
380 audio->playingCh4 = _resetEnvelope(&audio->ch4.envelope);
381
382 if (audio->ch4.power) {
383 audio->ch4.lfsr = 0x7F;
384 } else {
385 audio->ch4.lfsr = 0x7FFF;
386 }
387 if (!audio->ch4.length) {
388 audio->ch4.length = 64;
389 if (audio->ch4.stop && !(audio->frame & 1)) {
390 --audio->ch4.length;
391 }
392 }
393 if (audio->playingCh4 && audio->ch4.envelope.dead != 2 && !mTimingIsScheduled(audio->timing, &audio->ch4Event)) {
394 mTimingSchedule(audio->timing, &audio->ch4Event, 0);
395 }
396 }
397 *audio->nr52 &= ~0x0008;
398 *audio->nr52 |= audio->playingCh4 << 3;
399}
400
401void GBAudioWriteNR50(struct GBAudio* audio, uint8_t value) {
402 audio->volumeRight = GBRegisterNR50GetVolumeRight(value);
403 audio->volumeLeft = GBRegisterNR50GetVolumeLeft(value);
404}
405
406void GBAudioWriteNR51(struct GBAudio* audio, uint8_t value) {
407 audio->ch1Right = GBRegisterNR51GetCh1Right(value);
408 audio->ch2Right = GBRegisterNR51GetCh2Right(value);
409 audio->ch3Right = GBRegisterNR51GetCh3Right(value);
410 audio->ch4Right = GBRegisterNR51GetCh4Right(value);
411 audio->ch1Left = GBRegisterNR51GetCh1Left(value);
412 audio->ch2Left = GBRegisterNR51GetCh2Left(value);
413 audio->ch3Left = GBRegisterNR51GetCh3Left(value);
414 audio->ch4Left = GBRegisterNR51GetCh4Left(value);
415}
416
417void GBAudioWriteNR52(struct GBAudio* audio, uint8_t value) {
418 bool wasEnable = audio->enable;
419 audio->enable = GBAudioEnableGetEnable(value);
420 if (!audio->enable) {
421 audio->playingCh1 = 0;
422 audio->playingCh2 = 0;
423 audio->playingCh3 = 0;
424 audio->playingCh4 = 0;
425 GBAudioWriteNR10(audio, 0);
426 GBAudioWriteNR12(audio, 0);
427 GBAudioWriteNR13(audio, 0);
428 GBAudioWriteNR14(audio, 0);
429 GBAudioWriteNR22(audio, 0);
430 GBAudioWriteNR23(audio, 0);
431 GBAudioWriteNR24(audio, 0);
432 GBAudioWriteNR30(audio, 0);
433 GBAudioWriteNR32(audio, 0);
434 GBAudioWriteNR33(audio, 0);
435 GBAudioWriteNR34(audio, 0);
436 GBAudioWriteNR42(audio, 0);
437 GBAudioWriteNR43(audio, 0);
438 GBAudioWriteNR44(audio, 0);
439 GBAudioWriteNR50(audio, 0);
440 GBAudioWriteNR51(audio, 0);
441 if (audio->style != GB_AUDIO_DMG) {
442 GBAudioWriteNR11(audio, 0);
443 GBAudioWriteNR21(audio, 0);
444 GBAudioWriteNR31(audio, 0);
445 GBAudioWriteNR41(audio, 0);
446 }
447
448 if (audio->p) {
449 audio->p->memory.io[REG_NR10] = 0;
450 audio->p->memory.io[REG_NR11] = 0;
451 audio->p->memory.io[REG_NR12] = 0;
452 audio->p->memory.io[REG_NR13] = 0;
453 audio->p->memory.io[REG_NR14] = 0;
454 audio->p->memory.io[REG_NR21] = 0;
455 audio->p->memory.io[REG_NR22] = 0;
456 audio->p->memory.io[REG_NR23] = 0;
457 audio->p->memory.io[REG_NR24] = 0;
458 audio->p->memory.io[REG_NR30] = 0;
459 audio->p->memory.io[REG_NR31] = 0;
460 audio->p->memory.io[REG_NR32] = 0;
461 audio->p->memory.io[REG_NR33] = 0;
462 audio->p->memory.io[REG_NR34] = 0;
463 audio->p->memory.io[REG_NR42] = 0;
464 audio->p->memory.io[REG_NR43] = 0;
465 audio->p->memory.io[REG_NR44] = 0;
466 audio->p->memory.io[REG_NR50] = 0;
467 audio->p->memory.io[REG_NR51] = 0;
468 if (audio->style != GB_AUDIO_DMG) {
469 audio->p->memory.io[REG_NR11] = 0;
470 audio->p->memory.io[REG_NR21] = 0;
471 audio->p->memory.io[REG_NR31] = 0;
472 audio->p->memory.io[REG_NR41] = 0;
473 }
474 }
475 *audio->nr52 &= ~0x000F;
476 } else if (!wasEnable) {
477 audio->frame = 7;
478 }
479}
480
481void _updateFrame(struct mTiming* timing, void* user, uint32_t cyclesLate) {
482 struct GBAudio* audio = user;
483 GBAudioUpdateFrame(audio, timing);
484 if (audio->style == GB_AUDIO_GBA) {
485 mTimingSchedule(timing, &audio->frameEvent, audio->timingFactor * FRAME_CYCLES - cyclesLate);
486 }
487}
488
489void GBAudioUpdateFrame(struct GBAudio* audio, struct mTiming* timing) {
490 int frame = (audio->frame + 1) & 7;
491 audio->frame = frame;
492
493 switch (frame) {
494 case 2:
495 case 6:
496 if (audio->ch1.sweep.enable) {
497 --audio->ch1.sweep.step;
498 if (audio->ch1.sweep.step == 0) {
499 audio->playingCh1 = _updateSweep(&audio->ch1, false);
500 *audio->nr52 &= ~0x0001;
501 *audio->nr52 |= audio->playingCh1;
502 }
503 }
504 // Fall through
505 case 0:
506 case 4:
507 if (audio->ch1.control.length && audio->ch1.control.stop) {
508 --audio->ch1.control.length;
509 if (audio->ch1.control.length == 0) {
510 mTimingDeschedule(timing, &audio->ch1Event);
511 audio->playingCh1 = 0;
512 *audio->nr52 &= ~0x0001;
513 }
514 }
515
516 if (audio->ch2.control.length && audio->ch2.control.stop) {
517 --audio->ch2.control.length;
518 if (audio->ch2.control.length == 0) {
519 mTimingDeschedule(timing, &audio->ch2Event);
520 audio->playingCh2 = 0;
521 *audio->nr52 &= ~0x0002;
522 }
523 }
524
525 if (audio->ch3.length && audio->ch3.stop) {
526 --audio->ch3.length;
527 if (audio->ch3.length == 0) {
528 mTimingDeschedule(timing, &audio->ch3Event);
529 audio->playingCh3 = 0;
530 *audio->nr52 &= ~0x0004;
531 }
532 }
533
534 if (audio->ch4.length && audio->ch4.stop) {
535 --audio->ch4.length;
536 if (audio->ch4.length == 0) {
537 mTimingDeschedule(timing, &audio->ch4Event);
538 audio->playingCh4 = 0;
539 *audio->nr52 &= ~0x0008;
540 }
541 }
542 break;
543 case 7:
544 if (audio->playingCh1 && !audio->ch1.envelope.dead) {
545 --audio->ch1.envelope.nextStep;
546 if (audio->ch1.envelope.nextStep == 0) {
547 _updateEnvelope(&audio->ch1.envelope);
548 if (audio->ch1.envelope.dead == 2) {
549 mTimingDeschedule(timing, &audio->ch1Event);
550 }
551 _updateSquareSample(&audio->ch1);
552 }
553 }
554
555 if (audio->playingCh2 && !audio->ch2.envelope.dead) {
556 --audio->ch2.envelope.nextStep;
557 if (audio->ch2.envelope.nextStep == 0) {
558 _updateEnvelope(&audio->ch2.envelope);
559 if (audio->ch2.envelope.dead == 2) {
560 mTimingDeschedule(timing, &audio->ch2Event);
561 }
562 _updateSquareSample(&audio->ch2);
563 }
564 }
565
566 if (audio->playingCh4 && !audio->ch4.envelope.dead) {
567 --audio->ch4.envelope.nextStep;
568 if (audio->ch4.envelope.nextStep == 0) {
569 int8_t sample = audio->ch4.sample > 0;
570 audio->ch4.samples -= audio->ch4.sample;
571 _updateEnvelope(&audio->ch4.envelope);
572 if (audio->ch4.envelope.dead == 2) {
573 mTimingDeschedule(timing, &audio->ch4Event);
574 }
575 audio->ch4.sample = sample * audio->ch4.envelope.currentVolume;
576 audio->ch4.samples += audio->ch4.sample;
577 }
578 }
579 break;
580 }
581}
582
583void GBAudioSamplePSG(struct GBAudio* audio, int16_t* left, int16_t* right) {
584 int dcOffset = audio->style == GB_AUDIO_GBA ? 0 : -0x8;
585 int sampleLeft = dcOffset;
586 int sampleRight = dcOffset;
587
588 if (audio->playingCh1 && !audio->forceDisableCh[0]) {
589 if (audio->ch1Left) {
590 sampleLeft += audio->ch1.sample;
591 }
592
593 if (audio->ch1Right) {
594 sampleRight += audio->ch1.sample;
595 }
596 }
597
598 if (audio->playingCh2 && !audio->forceDisableCh[1]) {
599 if (audio->ch2Left) {
600 sampleLeft += audio->ch2.sample;
601 }
602
603 if (audio->ch2Right) {
604 sampleRight += audio->ch2.sample;
605 }
606 }
607
608 if (audio->playingCh3 && !audio->forceDisableCh[2]) {
609 if (audio->ch3Left) {
610 sampleLeft += audio->ch3.sample;
611 }
612
613 if (audio->ch3Right) {
614 sampleRight += audio->ch3.sample;
615 }
616 }
617
618 if (audio->playingCh4 && !audio->forceDisableCh[3]) {
619 int8_t sample = _coalesceNoiseChannel(&audio->ch4);
620 if (audio->ch4Left) {
621 sampleLeft += sample;
622 }
623
624 if (audio->ch4Right) {
625 sampleRight += sample;
626 }
627 }
628
629 sampleLeft <<= 3;
630 sampleRight <<= 3;
631
632 *left = sampleLeft * (1 + audio->volumeLeft);
633 *right = sampleRight * (1 + audio->volumeRight);
634}
635
636static void _sample(struct mTiming* timing, void* user, uint32_t cyclesLate) {
637 struct GBAudio* audio = user;
638 int16_t sampleLeft = 0;
639 int16_t sampleRight = 0;
640 GBAudioSamplePSG(audio, &sampleLeft, &sampleRight);
641 sampleLeft = (sampleLeft * audio->masterVolume * 6) >> 7;
642 sampleRight = (sampleRight * audio->masterVolume * 6) >> 7;
643
644 mCoreSyncLockAudio(audio->p->sync);
645 unsigned produced;
646
647 int16_t degradedLeft = sampleLeft - (audio->capLeft >> 16);
648 int16_t degradedRight = sampleRight - (audio->capRight >> 16);
649 audio->capLeft = (sampleLeft << 16) - degradedLeft * 65184;
650 audio->capRight = (sampleRight << 16) - degradedRight * 65184;
651 sampleLeft = degradedLeft;
652 sampleRight = degradedRight;
653
654 if ((size_t) blip_samples_avail(audio->left) < audio->samples) {
655 blip_add_delta(audio->left, audio->clock, sampleLeft - audio->lastLeft);
656 blip_add_delta(audio->right, audio->clock, sampleRight - audio->lastRight);
657 audio->lastLeft = sampleLeft;
658 audio->lastRight = sampleRight;
659 audio->clock += audio->sampleInterval;
660 if (audio->clock >= CLOCKS_PER_BLIP_FRAME) {
661 blip_end_frame(audio->left, CLOCKS_PER_BLIP_FRAME);
662 blip_end_frame(audio->right, CLOCKS_PER_BLIP_FRAME);
663 audio->clock -= CLOCKS_PER_BLIP_FRAME;
664 }
665 }
666 produced = blip_samples_avail(audio->left);
667 if (audio->p->stream && audio->p->stream->postAudioFrame) {
668 audio->p->stream->postAudioFrame(audio->p->stream, sampleLeft, sampleRight);
669 }
670 bool wait = produced >= audio->samples;
671 if (!mCoreSyncProduceAudio(audio->p->sync, audio->left, audio->samples)) {
672 // Interrupted
673 audio->p->earlyExit = true;
674 }
675
676 if (wait && audio->p->stream && audio->p->stream->postAudioBuffer) {
677 audio->p->stream->postAudioBuffer(audio->p->stream, audio->left, audio->right);
678 }
679 mTimingSchedule(timing, &audio->sampleEvent, audio->sampleInterval * audio->timingFactor - cyclesLate);
680}
681
682bool _resetEnvelope(struct GBAudioEnvelope* envelope) {
683 envelope->currentVolume = envelope->initialVolume;
684 _updateEnvelopeDead(envelope);
685 if (!envelope->dead) {
686 envelope->nextStep = envelope->stepTime;
687 }
688 return envelope->initialVolume || envelope->direction;
689}
690
691void _resetSweep(struct GBAudioSweep* sweep) {
692 sweep->step = sweep->time;
693 sweep->enable = (sweep->step != 8) || sweep->shift;
694 sweep->occurred = false;
695}
696
697bool _writeSweep(struct GBAudioSweep* sweep, uint8_t value) {
698 sweep->shift = GBAudioRegisterSquareSweepGetShift(value);
699 bool oldDirection = sweep->direction;
700 sweep->direction = GBAudioRegisterSquareSweepGetDirection(value);
701 bool on = true;
702 if (sweep->occurred && oldDirection && !sweep->direction) {
703 on = false;
704 }
705 sweep->occurred = false;
706 sweep->time = GBAudioRegisterSquareSweepGetTime(value);
707 if (!sweep->time) {
708 sweep->time = 8;
709 }
710 return on;
711}
712
713void _writeDuty(struct GBAudioEnvelope* envelope, uint8_t value) {
714 envelope->length = GBAudioRegisterDutyGetLength(value);
715 envelope->duty = GBAudioRegisterDutyGetDuty(value);
716}
717
718bool _writeEnvelope(struct GBAudioEnvelope* envelope, uint8_t value, enum GBAudioStyle style) {
719 envelope->stepTime = GBAudioRegisterSweepGetStepTime(value);
720 envelope->direction = GBAudioRegisterSweepGetDirection(value);
721 envelope->initialVolume = GBAudioRegisterSweepGetInitialVolume(value);
722 if (style == GB_AUDIO_DMG && !envelope->stepTime) {
723 // TODO: Improve "zombie" mode
724 ++envelope->currentVolume;
725 envelope->currentVolume &= 0xF;
726 }
727 _updateEnvelopeDead(envelope);
728 return (envelope->initialVolume || envelope->direction) && envelope->dead != 2;
729}
730
731static void _updateSquareSample(struct GBAudioSquareChannel* ch) {
732 ch->sample = ch->control.hi * ch->envelope.currentVolume;
733}
734
735static int32_t _updateSquareChannel(struct GBAudioSquareChannel* ch) {
736 ch->control.hi = !ch->control.hi;
737 _updateSquareSample(ch);
738 int period = 4 * (2048 - ch->control.frequency);
739 switch (ch->envelope.duty) {
740 case 0:
741 return ch->control.hi ? period : period * 7;
742 case 1:
743 return ch->control.hi ? period * 2 : period * 6;
744 case 2:
745 return period * 4;
746 case 3:
747 return ch->control.hi ? period * 6 : period * 2;
748 default:
749 // This should never be hit
750 return period * 4;
751 }
752}
753
754static int8_t _coalesceNoiseChannel(struct GBAudioNoiseChannel* ch) {
755 if (!ch->nSamples) {
756 return ch->sample;
757 }
758 // TODO keep track of timing
759 int8_t sample = ch->samples / ch->nSamples;
760 ch->nSamples = 0;
761 ch->samples = 0;
762 return sample;
763}
764
765static void _updateEnvelope(struct GBAudioEnvelope* envelope) {
766 if (envelope->direction) {
767 ++envelope->currentVolume;
768 } else {
769 --envelope->currentVolume;
770 }
771 if (envelope->currentVolume >= 15) {
772 envelope->currentVolume = 15;
773 envelope->dead = 1;
774 } else if (envelope->currentVolume <= 0) {
775 envelope->currentVolume = 0;
776 envelope->dead = 2;
777 } else {
778 envelope->nextStep = envelope->stepTime;
779 }
780}
781
782static void _updateEnvelopeDead(struct GBAudioEnvelope* envelope) {
783 if (!envelope->stepTime) {
784 envelope->dead = envelope->currentVolume ? 1 : 2;
785 } else if (!envelope->direction && !envelope->currentVolume) {
786 envelope->dead = 2;
787 } else if (envelope->direction && envelope->currentVolume == 0xF) {
788 envelope->dead = 1;
789 } else {
790 envelope->dead = 0;
791 }
792}
793
794static bool _updateSweep(struct GBAudioSquareChannel* ch, bool initial) {
795 if (initial || ch->sweep.time != 8) {
796 int frequency = ch->sweep.realFrequency;
797 if (ch->sweep.direction) {
798 frequency -= frequency >> ch->sweep.shift;
799 if (!initial && frequency >= 0) {
800 ch->control.frequency = frequency;
801 ch->sweep.realFrequency = frequency;
802 }
803 } else {
804 frequency += frequency >> ch->sweep.shift;
805 if (frequency < 2048) {
806 if (!initial && ch->sweep.shift) {
807 ch->control.frequency = frequency;
808 ch->sweep.realFrequency = frequency;
809 if (!_updateSweep(ch, true)) {
810 return false;
811 }
812 }
813 } else {
814 return false;
815 }
816 }
817 ch->sweep.occurred = true;
818 }
819 ch->sweep.step = ch->sweep.time;
820 return true;
821}
822
823static void _updateChannel1(struct mTiming* timing, void* user, uint32_t cyclesLate) {
824 struct GBAudio* audio = user;
825 struct GBAudioSquareChannel* ch = &audio->ch1;
826 int cycles = _updateSquareChannel(ch);
827 mTimingSchedule(timing, &audio->ch1Event, audio->timingFactor * cycles - cyclesLate);
828}
829
830static void _updateChannel2(struct mTiming* timing, void* user, uint32_t cyclesLate) {
831 struct GBAudio* audio = user;
832 struct GBAudioSquareChannel* ch = &audio->ch2;
833 int cycles = _updateSquareChannel(ch);
834 mTimingSchedule(timing, &audio->ch2Event, audio->timingFactor * cycles - cyclesLate);
835}
836
837static void _updateChannel3(struct mTiming* timing, void* user, uint32_t cyclesLate) {
838 struct GBAudio* audio = user;
839 struct GBAudioWaveChannel* ch = &audio->ch3;
840 int i;
841 int volume;
842 switch (ch->volume) {
843 case 0:
844 volume = 4;
845 break;
846 case 1:
847 volume = 0;
848 break;
849 case 2:
850 volume = 1;
851 break;
852 default:
853 case 3:
854 volume = 2;
855 break;
856 }
857 int start;
858 int end;
859 switch (audio->style) {
860 case GB_AUDIO_DMG:
861 default:
862 ++ch->window;
863 ch->window &= 0x1F;
864 ch->sample = ch->wavedata8[ch->window >> 1];
865 if (!(ch->window & 1)) {
866 ch->sample >>= 4;
867 }
868 ch->sample &= 0xF;
869 break;
870 case GB_AUDIO_GBA:
871 if (ch->size) {
872 start = 7;
873 end = 0;
874 } else if (ch->bank) {
875 start = 7;
876 end = 4;
877 } else {
878 start = 3;
879 end = 0;
880 }
881 uint32_t bitsCarry = ch->wavedata32[end] & 0x000000F0;
882 uint32_t bits;
883 for (i = start; i >= end; --i) {
884 bits = ch->wavedata32[i] & 0x000000F0;
885 ch->wavedata32[i] = ((ch->wavedata32[i] & 0x0F0F0F0F) << 4) | ((ch->wavedata32[i] & 0xF0F0F000) >> 12);
886 ch->wavedata32[i] |= bitsCarry << 20;
887 bitsCarry = bits;
888 }
889 ch->sample = bitsCarry >> 4;
890 break;
891 }
892 if (ch->volume > 3) {
893 ch->sample += ch->sample << 1;
894 }
895 ch->sample >>= volume;
896 audio->ch3.readable = true;
897 if (audio->style == GB_AUDIO_DMG) {
898 mTimingDeschedule(audio->timing, &audio->ch3Fade);
899 mTimingSchedule(timing, &audio->ch3Fade, 2 - cyclesLate);
900 }
901 int cycles = 2 * (2048 - ch->rate);
902 mTimingSchedule(timing, &audio->ch3Event, audio->timingFactor * cycles - cyclesLate);
903}
904static void _fadeChannel3(struct mTiming* timing, void* user, uint32_t cyclesLate) {
905 UNUSED(timing);
906 UNUSED(cyclesLate);
907 struct GBAudio* audio = user;
908 audio->ch3.readable = false;
909}
910
911static void _updateChannel4(struct mTiming* timing, void* user, uint32_t cyclesLate) {
912 struct GBAudio* audio = user;
913 struct GBAudioNoiseChannel* ch = &audio->ch4;
914
915 int32_t cycles = ch->ratio ? 2 * ch->ratio : 1;
916 cycles <<= ch->frequency;
917 cycles *= 8 * audio->timingFactor;
918
919 int lsb = ch->lfsr & 1;
920 ch->sample = lsb * ch->envelope.currentVolume;
921 ++ch->nSamples;
922 ch->samples += ch->sample;
923 ch->lfsr >>= 1;
924 ch->lfsr ^= (lsb * 0x60) << (ch->power ? 0 : 8);
925
926 mTimingSchedule(timing, &audio->ch4Event, cycles - cyclesLate);
927}
928
929void GBAudioPSGSerialize(const struct GBAudio* audio, struct GBSerializedPSGState* state, uint32_t* flagsOut) {
930 uint32_t flags = 0;
931 uint32_t ch1Flags = 0;
932 uint32_t ch2Flags = 0;
933 uint32_t ch4Flags = 0;
934
935 flags = GBSerializedAudioFlagsSetFrame(flags, audio->frame);
936 STORE_32LE(audio->frameEvent.when - mTimingCurrentTime(audio->timing), 0, &state->ch1.nextFrame);
937
938 flags = GBSerializedAudioFlagsSetCh1Volume(flags, audio->ch1.envelope.currentVolume);
939 flags = GBSerializedAudioFlagsSetCh1Dead(flags, audio->ch1.envelope.dead);
940 flags = GBSerializedAudioFlagsSetCh1Hi(flags, audio->ch1.control.hi);
941 flags = GBSerializedAudioFlagsSetCh1SweepEnabled(flags, audio->ch1.sweep.enable);
942 flags = GBSerializedAudioFlagsSetCh1SweepOccurred(flags, audio->ch1.sweep.occurred);
943 ch1Flags = GBSerializedAudioEnvelopeSetLength(ch1Flags, audio->ch1.control.length);
944 ch1Flags = GBSerializedAudioEnvelopeSetNextStep(ch1Flags, audio->ch1.envelope.nextStep);
945 ch1Flags = GBSerializedAudioEnvelopeSetFrequency(ch1Flags, audio->ch1.sweep.realFrequency);
946 STORE_32LE(ch1Flags, 0, &state->ch1.envelope);
947 STORE_32LE(audio->ch1Event.when - mTimingCurrentTime(audio->timing), 0, &state->ch1.nextEvent);
948
949 flags = GBSerializedAudioFlagsSetCh2Volume(flags, audio->ch2.envelope.currentVolume);
950 flags = GBSerializedAudioFlagsSetCh2Dead(flags, audio->ch2.envelope.dead);
951 flags = GBSerializedAudioFlagsSetCh2Hi(flags, audio->ch2.control.hi);
952 ch2Flags = GBSerializedAudioEnvelopeSetLength(ch2Flags, audio->ch2.control.length);
953 ch2Flags = GBSerializedAudioEnvelopeSetNextStep(ch2Flags, audio->ch2.envelope.nextStep);
954 STORE_32LE(ch2Flags, 0, &state->ch2.envelope);
955 STORE_32LE(audio->ch2Event.when - mTimingCurrentTime(audio->timing), 0, &state->ch2.nextEvent);
956
957 flags = GBSerializedAudioFlagsSetCh3Readable(flags, audio->ch3.readable);
958 memcpy(state->ch3.wavebanks, audio->ch3.wavedata32, sizeof(state->ch3.wavebanks));
959 STORE_16LE(audio->ch3.length, 0, &state->ch3.length);
960 STORE_32LE(audio->ch3Event.when - mTimingCurrentTime(audio->timing), 0, &state->ch3.nextEvent);
961 STORE_32LE(audio->ch3Fade.when - mTimingCurrentTime(audio->timing), 0, &state->ch1.nextCh3Fade);
962
963 flags = GBSerializedAudioFlagsSetCh4Volume(flags, audio->ch4.envelope.currentVolume);
964 flags = GBSerializedAudioFlagsSetCh4Dead(flags, audio->ch4.envelope.dead);
965 STORE_32LE(audio->ch4.lfsr, 0, &state->ch4.lfsr);
966 ch4Flags = GBSerializedAudioEnvelopeSetLength(ch4Flags, audio->ch4.length);
967 ch4Flags = GBSerializedAudioEnvelopeSetNextStep(ch4Flags, audio->ch4.envelope.nextStep);
968 STORE_32LE(ch4Flags, 0, &state->ch4.envelope);
969 STORE_32LE(audio->ch4Event.when - mTimingCurrentTime(audio->timing), 0, &state->ch4.nextEvent);
970
971 STORE_32LE(flags, 0, flagsOut);
972}
973
974void GBAudioPSGDeserialize(struct GBAudio* audio, const struct GBSerializedPSGState* state, const uint32_t* flagsIn) {
975 uint32_t flags;
976 uint32_t ch1Flags = 0;
977 uint32_t ch2Flags = 0;
978 uint32_t ch4Flags = 0;
979 uint32_t when;
980
981 audio->playingCh1 = !!(*audio->nr52 & 0x0001);
982 audio->playingCh2 = !!(*audio->nr52 & 0x0002);
983 audio->playingCh3 = !!(*audio->nr52 & 0x0004);
984 audio->playingCh4 = !!(*audio->nr52 & 0x0008);
985 audio->enable = GBAudioEnableGetEnable(*audio->nr52);
986
987 if (audio->style == GB_AUDIO_GBA) {
988 LOAD_32LE(when, 0, &state->ch1.nextFrame);
989 mTimingSchedule(audio->timing, &audio->frameEvent, when);
990 }
991
992 LOAD_32LE(flags, 0, flagsIn);
993 audio->frame = GBSerializedAudioFlagsGetFrame(flags);
994
995 LOAD_32LE(ch1Flags, 0, &state->ch1.envelope);
996 audio->ch1.envelope.currentVolume = GBSerializedAudioFlagsGetCh1Volume(flags);
997 audio->ch1.envelope.dead = GBSerializedAudioFlagsGetCh1Dead(flags);
998 audio->ch1.control.hi = GBSerializedAudioFlagsGetCh1Hi(flags);
999 audio->ch1.sweep.enable = GBSerializedAudioFlagsGetCh1SweepEnabled(flags);
1000 audio->ch1.sweep.occurred = GBSerializedAudioFlagsGetCh1SweepOccurred(flags);
1001 audio->ch1.control.length = GBSerializedAudioEnvelopeGetLength(ch1Flags);
1002 audio->ch1.envelope.nextStep = GBSerializedAudioEnvelopeGetNextStep(ch1Flags);
1003 audio->ch1.sweep.realFrequency = GBSerializedAudioEnvelopeGetFrequency(ch1Flags);
1004 LOAD_32LE(when, 0, &state->ch1.nextEvent);
1005 if (audio->ch1.envelope.dead < 2 && audio->playingCh1) {
1006 mTimingSchedule(audio->timing, &audio->ch1Event, when);
1007 }
1008
1009 LOAD_32LE(ch2Flags, 0, &state->ch2.envelope);
1010 audio->ch2.envelope.currentVolume = GBSerializedAudioFlagsGetCh2Volume(flags);
1011 audio->ch2.envelope.dead = GBSerializedAudioFlagsGetCh2Dead(flags);
1012 audio->ch2.control.hi = GBSerializedAudioFlagsGetCh2Hi(flags);
1013 audio->ch2.control.length = GBSerializedAudioEnvelopeGetLength(ch2Flags);
1014 audio->ch2.envelope.nextStep = GBSerializedAudioEnvelopeGetNextStep(ch2Flags);
1015 LOAD_32LE(when, 0, &state->ch2.nextEvent);
1016 if (audio->ch2.envelope.dead < 2 && audio->playingCh2) {
1017 mTimingSchedule(audio->timing, &audio->ch2Event, when);
1018 }
1019
1020 audio->ch3.readable = GBSerializedAudioFlagsGetCh3Readable(flags);
1021 // TODO: Big endian?
1022 memcpy(audio->ch3.wavedata32, state->ch3.wavebanks, sizeof(audio->ch3.wavedata32));
1023 LOAD_16LE(audio->ch3.length, 0, &state->ch3.length);
1024 LOAD_32LE(when, 0, &state->ch3.nextEvent);
1025 if (audio->playingCh3) {
1026 mTimingSchedule(audio->timing, &audio->ch3Event, when);
1027 }
1028 LOAD_32LE(when, 0, &state->ch1.nextCh3Fade);
1029 if (audio->ch3.readable && audio->style == GB_AUDIO_DMG) {
1030 mTimingSchedule(audio->timing, &audio->ch3Fade, when);
1031 }
1032
1033 LOAD_32LE(ch4Flags, 0, &state->ch4.envelope);
1034 audio->ch4.envelope.currentVolume = GBSerializedAudioFlagsGetCh4Volume(flags);
1035 audio->ch4.envelope.dead = GBSerializedAudioFlagsGetCh4Dead(flags);
1036 audio->ch4.length = GBSerializedAudioEnvelopeGetLength(ch4Flags);
1037 audio->ch4.envelope.nextStep = GBSerializedAudioEnvelopeGetNextStep(ch4Flags);
1038 LOAD_32LE(audio->ch4.lfsr, 0, &state->ch4.lfsr);
1039 LOAD_32LE(when, 0, &state->ch4.nextEvent);
1040 if (audio->ch4.envelope.dead < 2 && audio->playingCh4) {
1041 mTimingSchedule(audio->timing, &audio->ch4Event, when);
1042 }
1043}
1044
1045void GBAudioSerialize(const struct GBAudio* audio, struct GBSerializedState* state) {
1046 GBAudioPSGSerialize(audio, &state->audio.psg, &state->audio.flags);
1047 STORE_32LE(audio->capLeft, 0, &state->audio.capLeft);
1048 STORE_32LE(audio->capRight, 0, &state->audio.capRight);
1049 STORE_32LE(audio->sampleEvent.when - mTimingCurrentTime(audio->timing), 0, &state->audio.nextSample);
1050}
1051
1052void GBAudioDeserialize(struct GBAudio* audio, const struct GBSerializedState* state) {
1053 GBAudioPSGDeserialize(audio, &state->audio.psg, &state->audio.flags);
1054 LOAD_32LE(audio->capLeft, 0, &state->audio.capLeft);
1055 LOAD_32LE(audio->capRight, 0, &state->audio.capRight);
1056 uint32_t when;
1057 LOAD_32LE(when, 0, &state->audio.nextSample);
1058 mTimingSchedule(audio->timing, &audio->sampleEvent, when);
1059}