src/gba/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 "audio.h"
7
8#include "core/sync.h"
9#include "gba/gba.h"
10#include "gba/io.h"
11#include "gba/serialize.h"
12#include "gba/video.h"
13
14#ifdef _3DS
15#define blip_add_delta blip_add_delta_fast
16#endif
17
18mLOG_DEFINE_CATEGORY(GBA_AUDIO, "GBA Audio");
19
20const unsigned GBA_AUDIO_SAMPLES = 2048;
21const unsigned GBA_AUDIO_FIFO_SIZE = 8 * sizeof(int32_t);
22const int GBA_AUDIO_VOLUME_MAX = 0x100;
23
24static const int CLOCKS_PER_FRAME = 0x400;
25
26static int _applyBias(struct GBAAudio* audio, int sample);
27static void _sample(struct GBAAudio* audio);
28
29void GBAAudioInit(struct GBAAudio* audio, size_t samples) {
30 audio->psg.p = NULL;
31 uint8_t* nr52 = (uint8_t*) &audio->p->memory.io[REG_SOUNDCNT_X >> 1];
32#ifdef __BIG_ENDIAN__
33 ++nr52;
34#endif
35 GBAudioInit(&audio->psg, 0, nr52, GB_AUDIO_GBA);
36 audio->samples = samples;
37 audio->psg.clockRate = GBA_ARM7TDMI_FREQUENCY;
38 // Guess too large; we hang producing extra samples if we guess too low
39 blip_set_rates(audio->psg.left, GBA_ARM7TDMI_FREQUENCY, 96000);
40 blip_set_rates(audio->psg.right, GBA_ARM7TDMI_FREQUENCY, 96000);
41 CircleBufferInit(&audio->chA.fifo, GBA_AUDIO_FIFO_SIZE);
42 CircleBufferInit(&audio->chB.fifo, GBA_AUDIO_FIFO_SIZE);
43
44 audio->forceDisableChA = false;
45 audio->forceDisableChB = false;
46 audio->masterVolume = GBA_AUDIO_VOLUME_MAX;
47}
48
49void GBAAudioReset(struct GBAAudio* audio) {
50 GBAudioReset(&audio->psg);
51 audio->nextEvent = 0;
52 audio->chA.dmaSource = 1;
53 audio->chB.dmaSource = 2;
54 audio->chA.sample = 0;
55 audio->chB.sample = 0;
56 audio->eventDiff = 0;
57 audio->nextSample = 0;
58 audio->sampleRate = 0x8000;
59 audio->soundbias = 0x200;
60 audio->volume = 0;
61 audio->volumeChA = false;
62 audio->volumeChB = false;
63 audio->chARight = false;
64 audio->chALeft = false;
65 audio->chATimer = false;
66 audio->chBRight = false;
67 audio->chBLeft = false;
68 audio->chBTimer = false;
69 audio->enable = false;
70 audio->sampleInterval = GBA_ARM7TDMI_FREQUENCY / audio->sampleRate;
71
72 blip_clear(audio->psg.left);
73 blip_clear(audio->psg.right);
74 audio->clock = 0;
75 CircleBufferClear(&audio->chA.fifo);
76 CircleBufferClear(&audio->chB.fifo);
77}
78
79void GBAAudioDeinit(struct GBAAudio* audio) {
80 GBAudioDeinit(&audio->psg);
81 CircleBufferDeinit(&audio->chA.fifo);
82 CircleBufferDeinit(&audio->chB.fifo);
83}
84
85void GBAAudioResizeBuffer(struct GBAAudio* audio, size_t samples) {
86 mCoreSyncLockAudio(audio->p->sync);
87 audio->samples = samples;
88 blip_clear(audio->psg.left);
89 blip_clear(audio->psg.right);
90 audio->clock = 0;
91 mCoreSyncConsumeAudio(audio->p->sync);
92}
93
94int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles) {
95 audio->nextEvent -= cycles;
96 audio->eventDiff += cycles;
97 while (audio->nextEvent <= 0) {
98 audio->nextEvent = INT_MAX;
99 if (audio->enable) {
100 audio->nextEvent = GBAudioProcessEvents(&audio->psg, audio->eventDiff / 4);
101 if (audio->nextEvent != INT_MAX) {
102 audio->nextEvent *= 4;
103 }
104 }
105
106 audio->nextSample -= audio->eventDiff;
107 if (audio->nextSample <= 0) {
108 _sample(audio);
109 audio->nextSample += audio->sampleInterval;
110 }
111
112 if (audio->nextSample < audio->nextEvent) {
113 audio->nextEvent = audio->nextSample;
114 }
115 audio->eventDiff = 0;
116 }
117 return audio->nextEvent;
118}
119
120void GBAAudioScheduleFifoDma(struct GBAAudio* audio, int number, struct GBADMA* info) {
121 switch (info->dest) {
122 case BASE_IO | REG_FIFO_A_LO:
123 audio->chA.dmaSource = number;
124 break;
125 case BASE_IO | REG_FIFO_B_LO:
126 audio->chB.dmaSource = number;
127 break;
128 default:
129 mLOG(GBA_AUDIO, GAME_ERROR, "Invalid FIFO destination: 0x%08X", info->dest);
130 return;
131 }
132 info->reg = GBADMARegisterSetDestControl(info->reg, DMA_FIXED);
133}
134
135void GBAAudioWriteSOUND1CNT_LO(struct GBAAudio* audio, uint16_t value) {
136 GBAudioWriteNR10(&audio->psg, value);
137}
138
139void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value) {
140 GBAudioWriteNR11(&audio->psg, value);
141 GBAudioWriteNR12(&audio->psg, value >> 8);
142}
143
144void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value) {
145 GBAudioWriteNR13(&audio->psg, value);
146 GBAudioWriteNR14(&audio->psg, value >> 8);
147}
148
149void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value) {
150 GBAudioWriteNR21(&audio->psg, value);
151 GBAudioWriteNR22(&audio->psg, value >> 8);
152}
153
154void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value) {
155 GBAudioWriteNR23(&audio->psg, value);
156 GBAudioWriteNR24(&audio->psg, value >> 8);
157}
158
159void GBAAudioWriteSOUND3CNT_LO(struct GBAAudio* audio, uint16_t value) {
160 audio->psg.ch3.size = GBAudioRegisterBankGetSize(value);
161 audio->psg.ch3.bank = GBAudioRegisterBankGetBank(value);
162 GBAudioWriteNR30(&audio->psg, value);
163}
164
165void GBAAudioWriteSOUND3CNT_HI(struct GBAAudio* audio, uint16_t value) {
166 GBAudioWriteNR31(&audio->psg, value);
167 audio->psg.ch3.volume = GBAudioRegisterBankVolumeGetVolumeGBA(value >> 8);
168}
169
170void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value) {
171 GBAudioWriteNR33(&audio->psg, value);
172 GBAudioWriteNR34(&audio->psg, value >> 8);
173}
174
175void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value) {
176 GBAudioWriteNR41(&audio->psg, value);
177 GBAudioWriteNR42(&audio->psg, value >> 8);
178}
179
180void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value) {
181 GBAudioWriteNR43(&audio->psg, value);
182 GBAudioWriteNR44(&audio->psg, value >> 8);
183}
184
185void GBAAudioWriteSOUNDCNT_LO(struct GBAAudio* audio, uint16_t value) {
186 GBAudioWriteNR50(&audio->psg, value);
187 GBAudioWriteNR51(&audio->psg, value >> 8);
188}
189
190void GBAAudioWriteSOUNDCNT_HI(struct GBAAudio* audio, uint16_t value) {
191 audio->volume = GBARegisterSOUNDCNT_HIGetVolume(value);
192 audio->volumeChA = GBARegisterSOUNDCNT_HIGetVolumeChA(value);
193 audio->volumeChB = GBARegisterSOUNDCNT_HIGetVolumeChB(value);
194 audio->chARight = GBARegisterSOUNDCNT_HIGetChARight(value);
195 audio->chALeft = GBARegisterSOUNDCNT_HIGetChALeft(value);
196 audio->chATimer = GBARegisterSOUNDCNT_HIGetChATimer(value);
197 audio->chBRight = GBARegisterSOUNDCNT_HIGetChBRight(value);
198 audio->chBLeft = GBARegisterSOUNDCNT_HIGetChBLeft(value);
199 audio->chBTimer = GBARegisterSOUNDCNT_HIGetChBTimer(value);
200 if (GBARegisterSOUNDCNT_HIIsChAReset(value)) {
201 CircleBufferClear(&audio->chA.fifo);
202 }
203 if (GBARegisterSOUNDCNT_HIIsChBReset(value)) {
204 CircleBufferClear(&audio->chB.fifo);
205 }
206}
207
208void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value) {
209 audio->enable = GBAudioEnableGetEnable(value);
210 GBAudioWriteNR52(&audio->psg, value);
211}
212
213void GBAAudioWriteSOUNDBIAS(struct GBAAudio* audio, uint16_t value) {
214 audio->soundbias = value;
215}
216
217void GBAAudioWriteWaveRAM(struct GBAAudio* audio, int address, uint32_t value) {
218 audio->psg.ch3.wavedata32[address | (!audio->psg.ch3.bank * 4)] = value;
219}
220
221void GBAAudioWriteFIFO(struct GBAAudio* audio, int address, uint32_t value) {
222 struct CircleBuffer* fifo;
223 switch (address) {
224 case REG_FIFO_A_LO:
225 fifo = &audio->chA.fifo;
226 break;
227 case REG_FIFO_B_LO:
228 fifo = &audio->chB.fifo;
229 break;
230 default:
231 mLOG(GBA_AUDIO, ERROR, "Bad FIFO write to address 0x%03x", address);
232 return;
233 }
234 int i;
235 for (i = 0; i < 4; ++i) {
236 while (!CircleBufferWrite8(fifo, value >> (8 * i))) {
237 int8_t dummy;
238 CircleBufferRead8(fifo, &dummy);
239 }
240 }
241}
242
243void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId, int32_t cycles) {
244 struct GBAAudioFIFO* channel;
245 if (fifoId == 0) {
246 channel = &audio->chA;
247 } else if (fifoId == 1) {
248 channel = &audio->chB;
249 } else {
250 mLOG(GBA_AUDIO, ERROR, "Bad FIFO write to address 0x%03x", fifoId);
251 return;
252 }
253 if (CircleBufferSize(&channel->fifo) <= 4 * sizeof(int32_t) && channel->dmaSource > 0) {
254 struct GBADMA* dma = &audio->p->memory.dma[channel->dmaSource];
255 if (GBADMARegisterGetTiming(dma->reg) == DMA_TIMING_CUSTOM) {
256 dma->nextCount = 4;
257 dma->nextEvent = 0;
258 dma->reg = GBADMARegisterSetWidth(dma->reg, 1);
259 dma->reg = GBADMARegisterSetDestControl(dma->reg, 2);
260 GBAMemoryUpdateDMAs(audio->p, -cycles);
261 } else {
262 channel->dmaSource = 0;
263 }
264 }
265 CircleBufferRead8(&channel->fifo, (int8_t*) &channel->sample);
266}
267
268static int _applyBias(struct GBAAudio* audio, int sample) {
269 sample += GBARegisterSOUNDBIASGetBias(audio->soundbias);
270 if (sample >= 0x400) {
271 sample = 0x3FF;
272 } else if (sample < 0) {
273 sample = 0;
274 }
275 return ((sample - GBARegisterSOUNDBIASGetBias(audio->soundbias)) * audio->masterVolume) >> 3;
276}
277
278static void _sample(struct GBAAudio* audio) {
279 int16_t sampleLeft = 0;
280 int16_t sampleRight = 0;
281 int psgShift = 5 - audio->volume;
282 GBAudioSamplePSG(&audio->psg, &sampleLeft, &sampleRight);
283 sampleLeft >>= psgShift;
284 sampleRight >>= psgShift;
285
286 if (!audio->forceDisableChA) {
287 if (audio->chALeft) {
288 sampleLeft += (audio->chA.sample << 2) >> !audio->volumeChA;
289 }
290
291 if (audio->chARight) {
292 sampleRight += (audio->chA.sample << 2) >> !audio->volumeChA;
293 }
294 }
295
296 if (!audio->forceDisableChB) {
297 if (audio->chBLeft) {
298 sampleLeft += (audio->chB.sample << 2) >> !audio->volumeChB;
299 }
300
301 if (audio->chBRight) {
302 sampleRight += (audio->chB.sample << 2) >> !audio->volumeChB;
303 }
304 }
305
306 sampleLeft = _applyBias(audio, sampleLeft);
307 sampleRight = _applyBias(audio, sampleRight);
308
309 mCoreSyncLockAudio(audio->p->sync);
310 unsigned produced;
311 if ((size_t) blip_samples_avail(audio->psg.left) < audio->samples) {
312 blip_add_delta(audio->psg.left, audio->clock, sampleLeft - audio->lastLeft);
313 blip_add_delta(audio->psg.right, audio->clock, sampleRight - audio->lastRight);
314 audio->lastLeft = sampleLeft;
315 audio->lastRight = sampleRight;
316 audio->clock += audio->sampleInterval;
317 if (audio->clock >= CLOCKS_PER_FRAME) {
318 blip_end_frame(audio->psg.left, audio->clock);
319 blip_end_frame(audio->psg.right, audio->clock);
320 audio->clock -= CLOCKS_PER_FRAME;
321 }
322 }
323 produced = blip_samples_avail(audio->psg.left);
324 if (audio->p->stream && audio->p->stream->postAudioFrame) {
325 audio->p->stream->postAudioFrame(audio->p->stream, sampleLeft, sampleRight);
326 }
327 bool wait = produced >= audio->samples;
328 mCoreSyncProduceAudio(audio->p->sync, wait);
329
330 if (wait && audio->p->stream && audio->p->stream->postAudioBuffer) {
331 audio->p->stream->postAudioBuffer(audio->p->stream, audio->psg.left, audio->psg.right);
332 }
333}
334
335void GBAAudioSerialize(const struct GBAAudio* audio, struct GBASerializedState* state) {
336 GBAudioPSGSerialize(&audio->psg, &state->audio.psg, &state->audio.flags);
337
338 CircleBufferDump(&audio->chA.fifo, state->audio.fifoA, sizeof(state->audio.fifoA));
339 CircleBufferDump(&audio->chB.fifo, state->audio.fifoB, sizeof(state->audio.fifoB));
340 uint32_t fifoSize = CircleBufferSize(&audio->chA.fifo);
341 STORE_32(fifoSize, 0, &state->audio.fifoSize);
342
343 STORE_32(audio->nextEvent, 0, &state->audio.nextEvent);
344 STORE_32(audio->eventDiff, 0, &state->audio.eventDiff);
345 STORE_32(audio->nextSample, 0, &state->audio.nextSample);
346}
347
348void GBAAudioDeserialize(struct GBAAudio* audio, const struct GBASerializedState* state) {
349 GBAudioPSGDeserialize(&audio->psg, &state->audio.psg, &state->audio.flags);
350
351 CircleBufferClear(&audio->chA.fifo);
352 CircleBufferClear(&audio->chB.fifo);
353 uint32_t fifoSize;
354 LOAD_32(fifoSize, 0, &state->audio.fifoSize);
355 if (state->audio.fifoSize > CircleBufferCapacity(&audio->chA.fifo)) {
356 fifoSize = CircleBufferCapacity(&audio->chA.fifo);
357 }
358 size_t i;
359 for (i = 0; i < fifoSize; ++i) {
360 CircleBufferWrite8(&audio->chA.fifo, state->audio.fifoA[i]);
361 CircleBufferWrite8(&audio->chB.fifo, state->audio.fifoB[i]);
362 }
363
364 LOAD_32(audio->nextEvent, 0, &state->audio.nextEvent);
365 LOAD_32(audio->eventDiff, 0, &state->audio.eventDiff);
366 LOAD_32(audio->nextSample, 0, &state->audio.nextSample);
367}
368
369float GBAAudioCalculateRatio(float inputSampleRate, float desiredFPS, float desiredSampleRate) {
370 return desiredSampleRate * GBA_ARM7TDMI_FREQUENCY / (VIDEO_TOTAL_LENGTH * desiredFPS * inputSampleRate);
371}