get rid of GP2X_BUILD checks where they are not really needed
[gpsp.git] / sound.c
CommitLineData
2823a4c8 1/* gameplaySP
2 *
3 * Copyright (C) 2006 Exophase <exophase@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20
21#include "common.h"
22#include <SDL.h>
23u32 global_enable_audio = 1;
24
25direct_sound_struct direct_sound_channel[2];
26gbc_sound_struct gbc_sound_channel[4];
27
2823a4c8 28u32 sound_frequency = 44100;
2823a4c8 29
30SDL_AudioSpec sound_settings;
31SDL_mutex *sound_mutex;
32SDL_cond *sound_cv;
33
34#ifndef PSP_BUILD
35u32 audio_buffer_size_number = 7;
36#else
37u32 audio_buffer_size_number = 1;
38#endif
39
40u32 audio_buffer_size;
41u32 sound_on = 0;
42s16 sound_buffer[BUFFER_SIZE];
43u32 sound_buffer_base = 0;
44
45u32 sound_last_cpu_ticks = 0;
46fixed16_16 gbc_sound_tick_step;
47
48// Queue 1, 2, or 4 samples to the top of the DS FIFO, wrap around circularly
49
50#define sound_timer_queue(size, value) \
51 *((s##size *)(ds->fifo + ds->fifo_top)) = value; \
52 ds->fifo_top = (ds->fifo_top + 1) % 32; \
53
54void sound_timer_queue8(u32 channel, u8 value)
55{
56 direct_sound_struct *ds = direct_sound_channel + channel;
57 sound_timer_queue(8, value);
58}
59
60void sound_timer_queue16(u32 channel, u16 value)
61{
62 direct_sound_struct *ds = direct_sound_channel + channel;
63 sound_timer_queue(8, value & 0xFF);
64 sound_timer_queue(8, value >> 8);
65}
66
67void sound_timer_queue32(u32 channel, u32 value)
68{
69 direct_sound_struct *ds = direct_sound_channel + channel;
70
71 sound_timer_queue(8, value & 0xFF);
72 sound_timer_queue(8, (value >> 8) & 0xFF);
73 sound_timer_queue(8, (value >> 16) & 0xFF);
74 sound_timer_queue(8, value >> 24);
75}
76
77// Unqueue 1 sample from the base of the DS FIFO and place it on the audio
78// buffer for as many samples as necessary. If the DS FIFO is 16 bytes or
79// smaller and if DMA is enabled for the sound channel initiate a DMA transfer
80// to the DS FIFO.
81
82#define render_sample_null() \
83
84#define render_sample_left() \
85 sound_buffer[buffer_index] += current_sample + \
86 fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \
87
88#define render_sample_right() \
89 sound_buffer[buffer_index + 1] += current_sample + \
90 fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \
91
92#define render_sample_both() \
93 dest_sample = current_sample + \
94 fp16_16_to_u32((next_sample - current_sample) * fifo_fractional); \
95 sound_buffer[buffer_index] += dest_sample; \
96 sound_buffer[buffer_index + 1] += dest_sample \
97
98#define render_samples(type) \
99 while(fifo_fractional <= 0xFFFF) \
100 { \
101 render_sample_##type(); \
102 fifo_fractional += frequency_step; \
103 buffer_index = (buffer_index + 2) % BUFFER_SIZE; \
104 } \
105
106void sound_timer(fixed16_16 frequency_step, u32 channel)
107{
108 direct_sound_struct *ds = direct_sound_channel + channel;
109
110 fixed16_16 fifo_fractional = ds->fifo_fractional;
111 u32 buffer_index = ds->buffer_index;
112 s16 current_sample, next_sample, dest_sample;
113
114 current_sample = ds->fifo[ds->fifo_base] << 4;
115 ds->fifo_base = (ds->fifo_base + 1) % 32;
116 next_sample = ds->fifo[ds->fifo_base] << 4;
117
118 if(sound_on == 1)
119 {
120 if(ds->volume == DIRECT_SOUND_VOLUME_50)
121 {
122 current_sample >>= 1;
123 next_sample >>= 1;
124 }
125
126 switch(ds->status)
127 {
128 case DIRECT_SOUND_INACTIVE:
129 render_samples(null);
130 break;
131
132 case DIRECT_SOUND_RIGHT:
133 render_samples(right);
134 break;
135
136 case DIRECT_SOUND_LEFT:
137 render_samples(left);
138 break;
139
140 case DIRECT_SOUND_LEFTRIGHT:
141 render_samples(both);
142 break;
143 }
144 }
145 else
146 {
147 render_samples(null);
148 }
149
150 ds->buffer_index = buffer_index;
151 ds->fifo_fractional = fp16_16_fractional_part(fifo_fractional);
152
153 if(((ds->fifo_top - ds->fifo_base) % 32) <= 16)
154 {
155 if(dma[1].direct_sound_channel == channel)
156 dma_transfer(dma + 1);
157
158 if(dma[2].direct_sound_channel == channel)
159 dma_transfer(dma + 2);
160 }
161}
162
163void sound_reset_fifo(u32 channel)
164{
165 direct_sound_struct *ds = direct_sound_channel;
166
167 memset(ds->fifo, 0, 32);
168}
169
170// Initial pattern data = 4bits (signed)
171// Channel volume = 12bits
172// Envelope volume = 14bits
173// Master volume = 2bits
174
175// Recalculate left and right volume as volume changes.
176// To calculate the current sample, use (sample * volume) >> 16
177
178// Square waves range from -8 (low) to 7 (high)
179
180s8 square_pattern_duty[4][8] =
181{
182 { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0xF8, 0xF8, 0xF8 },
183 { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0x07, 0xF8, 0xF8 },
184 { 0xF8, 0xF8, 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8 },
185 { 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8, 0x07, 0x07 },
186};
187
188s8 wave_samples[64];
189
190u32 noise_table15[1024];
191u32 noise_table7[4];
192
193u32 gbc_sound_master_volume_table[4] = { 1, 2, 4, 0 };
194
195u32 gbc_sound_channel_volume_table[8] =
196{
197 fixed_div(0, 7, 12),
198 fixed_div(1, 7, 12),
199 fixed_div(2, 7, 12),
200 fixed_div(3, 7, 12),
201 fixed_div(4, 7, 12),
202 fixed_div(5, 7, 12),
203 fixed_div(6, 7, 12),
204 fixed_div(7, 7, 12)
205};
206
207u32 gbc_sound_envelope_volume_table[16] =
208{
209 fixed_div(0, 15, 14),
210 fixed_div(1, 15, 14),
211 fixed_div(2, 15, 14),
212 fixed_div(3, 15, 14),
213 fixed_div(4, 15, 14),
214 fixed_div(5, 15, 14),
215 fixed_div(6, 15, 14),
216 fixed_div(7, 15, 14),
217 fixed_div(8, 15, 14),
218 fixed_div(9, 15, 14),
219 fixed_div(10, 15, 14),
220 fixed_div(11, 15, 14),
221 fixed_div(12, 15, 14),
222 fixed_div(13, 15, 14),
223 fixed_div(14, 15, 14),
224 fixed_div(15, 15, 14)
225};
226
227u32 gbc_sound_buffer_index = 0;
228u32 gbc_sound_last_cpu_ticks = 0;
229u32 gbc_sound_partial_ticks = 0;
230
231u32 gbc_sound_master_volume_left;
232u32 gbc_sound_master_volume_right;
233u32 gbc_sound_master_volume;
234
235#define update_volume_channel_envelope(channel) \
236 volume_##channel = gbc_sound_envelope_volume_table[envelope_volume] * \
237 gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \
238 gbc_sound_master_volume_table[gbc_sound_master_volume] \
239
240#define update_volume_channel_noenvelope(channel) \
241 volume_##channel = gs->wave_volume * \
242 gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \
243 gbc_sound_master_volume_table[gbc_sound_master_volume] \
244
245#define update_volume(type) \
246 update_volume_channel_##type(left); \
247 update_volume_channel_##type(right) \
248
249#define update_tone_sweep() \
250 if(gs->sweep_status) \
251 { \
252 u32 sweep_ticks = gs->sweep_ticks - 1; \
253 \
254 if(sweep_ticks == 0) \
255 { \
256 u32 rate = gs->rate; \
257 \
258 if(gs->sweep_direction) \
259 rate = rate - (rate >> gs->sweep_shift); \
260 else \
261 rate = rate + (rate >> gs->sweep_shift); \
262 \
263 if(rate > 2048) \
264 rate = 2048; \
265 \
266 frequency_step = float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / \
267 sound_frequency); \
268 \
269 gs->frequency_step = frequency_step; \
270 gs->rate = rate; \
271 \
272 sweep_ticks = gs->sweep_initial_ticks; \
273 } \
274 gs->sweep_ticks = sweep_ticks; \
275 } \
276
277#define update_tone_nosweep() \
278
279#define update_tone_envelope() \
280 if(gs->envelope_status) \
281 { \
282 u32 envelope_ticks = gs->envelope_ticks - 1; \
283 envelope_volume = gs->envelope_volume; \
284 \
285 if(envelope_ticks == 0) \
286 { \
287 if(gs->envelope_direction) \
288 { \
289 if(envelope_volume != 15) \
290 envelope_volume = gs->envelope_volume + 1; \
291 } \
292 else \
293 { \
294 if(envelope_volume != 0) \
295 envelope_volume = gs->envelope_volume - 1; \
296 } \
297 \
298 update_volume(envelope); \
299 \
300 gs->envelope_volume = envelope_volume; \
301 gs->envelope_ticks = gs->envelope_initial_ticks; \
302 } \
303 else \
304 { \
305 gs->envelope_ticks = envelope_ticks; \
306 } \
307 } \
308
309#define update_tone_noenvelope() \
310
311#define gbc_sound_synchronize() \
312 while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > \
313 (audio_buffer_size * 2)) \
314 { \
315 SDL_CondWait(sound_cv, sound_mutex); \
316 } \
317
318#define update_tone_counters(envelope_op, sweep_op) \
319 tick_counter += gbc_sound_tick_step; \
320 if(tick_counter > 0xFFFF) \
321 { \
322 if(gs->length_status) \
323 { \
324 u32 length_ticks = gs->length_ticks - 1; \
325 gs->length_ticks = length_ticks; \
326 \
327 if(length_ticks == 0) \
328 { \
329 gs->active_flag = 0; \
330 break; \
331 } \
332 } \
333 \
334 update_tone_##envelope_op(); \
335 update_tone_##sweep_op(); \
336 \
337 tick_counter &= 0xFFFF; \
338 } \
339
340#define gbc_sound_render_sample_right() \
341 sound_buffer[buffer_index + 1] += (current_sample * volume_right) >> 22 \
342
343#define gbc_sound_render_sample_left() \
344 sound_buffer[buffer_index] += (current_sample * volume_left) >> 22 \
345
346#define gbc_sound_render_sample_both() \
347 gbc_sound_render_sample_right(); \
348 gbc_sound_render_sample_left() \
349
350#define gbc_sound_render_samples(type, sample_length, envelope_op, sweep_op) \
351 for(i = 0; i < buffer_ticks; i++) \
352 { \
353 current_sample = \
354 sample_data[fp16_16_to_u32(sample_index) % sample_length]; \
355 gbc_sound_render_sample_##type(); \
356 \
357 sample_index += frequency_step; \
358 buffer_index = (buffer_index + 2) % BUFFER_SIZE; \
359 \
360 update_tone_counters(envelope_op, sweep_op); \
361 } \
362
363#define gbc_noise_wrap_full 32767
364
365#define gbc_noise_wrap_half 126
366
367#define get_noise_sample_full() \
368 current_sample = \
369 ((s32)(noise_table15[fp16_16_to_u32(sample_index) >> 5] << \
370 (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \
371
372#define get_noise_sample_half() \
373 current_sample = \
374 ((s32)(noise_table7[fp16_16_to_u32(sample_index) >> 5] << \
375 (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \
376
377#define gbc_sound_render_noise(type, noise_type, envelope_op, sweep_op) \
378 for(i = 0; i < buffer_ticks; i++) \
379 { \
380 get_noise_sample_##noise_type(); \
381 gbc_sound_render_sample_##type(); \
382 \
383 sample_index += frequency_step; \
384 \
385 if(sample_index >= u32_to_fp16_16(gbc_noise_wrap_##noise_type)) \
386 sample_index -= u32_to_fp16_16(gbc_noise_wrap_##noise_type); \
387 \
388 buffer_index = (buffer_index + 2) % BUFFER_SIZE; \
389 update_tone_counters(envelope_op, sweep_op); \
390 } \
391
392#define gbc_sound_render_channel(type, sample_length, envelope_op, sweep_op) \
393 buffer_index = gbc_sound_buffer_index; \
394 sample_index = gs->sample_index; \
395 frequency_step = gs->frequency_step; \
396 tick_counter = gs->tick_counter; \
397 \
398 update_volume(envelope_op); \
399 \
400 switch(gs->status) \
401 { \
402 case GBC_SOUND_INACTIVE: \
403 break; \
404 \
405 case GBC_SOUND_LEFT: \
406 gbc_sound_render_##type(left, sample_length, envelope_op, sweep_op); \
407 break; \
408 \
409 case GBC_SOUND_RIGHT: \
410 gbc_sound_render_##type(right, sample_length, envelope_op, sweep_op); \
411 break; \
412 \
413 case GBC_SOUND_LEFTRIGHT: \
414 gbc_sound_render_##type(both, sample_length, envelope_op, sweep_op); \
415 break; \
416 } \
417 \
418 gs->sample_index = sample_index; \
419 gs->tick_counter = tick_counter; \
420
421#define gbc_sound_load_wave_ram(bank) \
422 wave_bank = wave_samples + (bank * 32); \
423 for(i = 0, i2 = 0; i < 16; i++, i2 += 2) \
424 { \
425 current_sample = wave_ram[i]; \
426 wave_bank[i2] = (((current_sample >> 4) & 0x0F) - 8); \
427 wave_bank[i2 + 1] = ((current_sample & 0x0F) - 8); \
428 } \
429
430void synchronize_sound()
431{
432 SDL_LockMutex(sound_mutex);
433
434 gbc_sound_synchronize();
435
436 SDL_UnlockMutex(sound_mutex);
437}
438
439void update_gbc_sound(u32 cpu_ticks)
440{
441 fixed16_16 buffer_ticks = float_to_fp16_16(((float)(cpu_ticks -
442 gbc_sound_last_cpu_ticks) * sound_frequency) / 16777216.0);
443 u32 i, i2;
444 gbc_sound_struct *gs = gbc_sound_channel;
445 fixed16_16 sample_index, frequency_step;
446 fixed16_16 tick_counter;
447 u32 buffer_index;
448 s32 volume_left, volume_right;
449 u32 envelope_volume;
450 s32 current_sample;
451 u32 sound_status = address16(io_registers, 0x84) & 0xFFF0;
452 s8 *sample_data;
453 s8 *wave_bank;
454 u8 *wave_ram = ((u8 *)io_registers) + 0x90;
455
456 gbc_sound_partial_ticks += fp16_16_fractional_part(buffer_ticks);
457 buffer_ticks = fp16_16_to_u32(buffer_ticks);
458
459 if(gbc_sound_partial_ticks > 0xFFFF)
460 {
461 buffer_ticks += 1;
462 gbc_sound_partial_ticks &= 0xFFFF;
463 }
464
465 SDL_LockMutex(sound_mutex);
466 if(synchronize_flag)
467 {
468 if(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) >
469 (audio_buffer_size * 3 / 2))
470 {
471 while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) >
472 (audio_buffer_size * 3 / 2))
473 {
474 SDL_CondWait(sound_cv, sound_mutex);
475 }
476
477#ifdef PSP_BUILD
478 if(current_frameskip_type == auto_frameskip)
479 {
480 sceDisplayWaitVblankStart();
481 real_frame_count = 0;
482 virtual_frame_count = 0;
483 }
484#endif
485
486/*
487
488#ifdef GP2X_BUILD
489 if(current_frameskip_type == auto_frameskip)
490 {
491 u64 current_ticks;
492 u64 next_ticks;
493 get_ticks_us(&current_ticks);
494
495 next_ticks = ((current_ticks + 16666) / 16667) * 16667;
496 delay_us(next_ticks - current_ticks);
497
498 get_ticks_us(&frame_count_initial_timestamp);
499 real_frame_count = 0;
500 virtual_frame_count = 0;
501 }
502#endif
503
504*/
505 }
506 }
507 if(sound_on == 1)
508 {
509 gs = gbc_sound_channel + 0;
510 if(gs->active_flag)
511 {
512 sound_status |= 0x01;
513 sample_data = gs->sample_data;
514 envelope_volume = gs->envelope_volume;
515 gbc_sound_render_channel(samples, 8, envelope, sweep);
516 }
517
518 gs = gbc_sound_channel + 1;
519 if(gs->active_flag)
520 {
521 sound_status |= 0x02;
522 sample_data = gs->sample_data;
523 envelope_volume = gs->envelope_volume;
524 gbc_sound_render_channel(samples, 8, envelope, nosweep);
525 }
526
527 gs = gbc_sound_channel + 2;
528 if(gbc_sound_wave_update)
529 {
530 if(gs->wave_bank == 1)
531 {
532 gbc_sound_load_wave_ram(1);
533 }
534 else
535 {
536 gbc_sound_load_wave_ram(0);
537 }
538
539 gbc_sound_wave_update = 0;
540 }
541
542 if((gs->active_flag) && (gs->master_enable))
543 {
544 sound_status |= 0x04;
545 sample_data = wave_samples;
546 if(gs->wave_type == 0)
547 {
548 if(gs->wave_bank == 1)
549 sample_data += 32;
550
551 gbc_sound_render_channel(samples, 32, noenvelope, nosweep);
552 }
553 else
554 {
555 gbc_sound_render_channel(samples, 64, noenvelope, nosweep);
556 }
557 }
558
559 gs = gbc_sound_channel + 3;
560 if(gs->active_flag)
561 {
562 sound_status |= 0x08;
563 envelope_volume = gs->envelope_volume;
564
565 if(gs->noise_type == 1)
566 {
567 gbc_sound_render_channel(noise, half, envelope, nosweep);
568 }
569 else
570 {
571 gbc_sound_render_channel(noise, full, envelope, nosweep);
572 }
573 }
574 }
575
576 address16(io_registers, 0x84) = sound_status;
577
2823a4c8 578 gbc_sound_last_cpu_ticks = cpu_ticks;
579 gbc_sound_buffer_index =
580 (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE;
e9c7b137 581
582 SDL_UnlockMutex(sound_mutex);
583
584 SDL_CondSignal(sound_cv);
2823a4c8 585}
586
587#define sound_copy_normal() \
588 current_sample = source[i] \
589
590#define sound_copy(source_offset, length, render_type) \
591 _length = (length) / 2; \
592 source = (s16 *)(sound_buffer + source_offset); \
593 for(i = 0; i < _length; i++) \
594 { \
595 sound_copy_##render_type(); \
596 if(current_sample > 2047) \
597 current_sample = 2047; \
598 if(current_sample < -2048) \
599 current_sample = -2048; \
600 \
601 stream_base[i] = current_sample << 4; \
602 source[i] = 0; \
603 } \
604
605#define sound_copy_null(source_offset, length) \
606 _length = (length) / 2; \
607 source = (s16 *)(sound_buffer + source_offset); \
608 for(i = 0; i < _length; i++) \
609 { \
610 stream_base[i] = 0; \
611 source[i] = 0; \
612 } \
613
614
615void sound_callback(void *userdata, Uint8 *stream, int length)
616{
617 u32 sample_length = length / 2;
618 u32 _length;
619 u32 i;
620 s16 *stream_base = (s16 *)stream;
621 s16 *source;
622 s32 current_sample;
623
624 SDL_LockMutex(sound_mutex);
625
626 while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) <
627 length)
628 {
629 SDL_CondWait(sound_cv, sound_mutex);
630 }
631
632 if(global_enable_audio)
633 {
634 if((sound_buffer_base + sample_length) >= BUFFER_SIZE)
635 {
636 u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2;
637 sound_copy(sound_buffer_base, partial_length, normal);
638 source = (s16 *)sound_buffer;
639 sound_copy(0, length - partial_length, normal);
640 sound_buffer_base = (length - partial_length) / 2;
641 }
642 else
643 {
644 sound_copy(sound_buffer_base, length, normal);
645 sound_buffer_base += sample_length;
646 }
647 }
648 else
649 {
650 if((sound_buffer_base + sample_length) >= BUFFER_SIZE)
651 {
652 u32 partial_length = (BUFFER_SIZE - sound_buffer_base) * 2;
653 sound_copy_null(sound_buffer_base, partial_length);
654 source = (s16 *)sound_buffer;
655 sound_copy(0, length - partial_length, normal);
656 sound_buffer_base = (length - partial_length) / 2;
657 }
658 else
659 {
660 sound_copy_null(sound_buffer_base, length);
661 sound_buffer_base += sample_length;
662 }
663 }
664
665 SDL_CondSignal(sound_cv);
666
667 SDL_UnlockMutex(sound_mutex);
668}
669
670// Special thanks to blarrg for the LSFR frequency used in Meridian, as posted
671// on the forum at http://meridian.overclocked.org:
672// http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid
673// angeneraldiscussion&Number=2069&page=0&view=expanded&mode=threaded&sb=4
674// Hope you don't mind me borrowing it ^_-
675
676void init_noise_table(u32 *table, u32 period, u32 bit_length)
677{
678 u32 shift_register = 0xFF;
679 u32 mask = ~(1 << bit_length);
680 s32 table_pos, bit_pos;
681 u32 current_entry;
682 u32 table_period = (period + 31) / 32;
683
684 // Bits are stored in reverse order so they can be more easily moved to
685 // bit 31, for sign extended shift down.
686
687 for(table_pos = 0; table_pos < table_period; table_pos++)
688 {
689 current_entry = 0;
690 for(bit_pos = 31; bit_pos >= 0; bit_pos--)
691 {
692 current_entry |= (shift_register & 0x01) << bit_pos;
693
694 shift_register =
695 ((1 & (shift_register ^ (shift_register >> 1))) << bit_length) |
696 ((shift_register >> 1) & mask);
697 }
698
699 table[table_pos] = current_entry;
700 }
701}
702
703void reset_sound()
704{
705 direct_sound_struct *ds = direct_sound_channel;
706 gbc_sound_struct *gs = gbc_sound_channel;
707 u32 i;
708
709 sound_on = 0;
710 sound_buffer_base = 0;
711 sound_last_cpu_ticks = 0;
712 memset(sound_buffer, 0, audio_buffer_size);
713
714 for(i = 0; i < 2; i++, ds++)
715 {
716 ds->buffer_index = 0;
717 ds->status = DIRECT_SOUND_INACTIVE;
718 ds->fifo_top = 0;
719 ds->fifo_base = 0;
720 ds->fifo_fractional = 0;
721 ds->last_cpu_ticks = 0;
722 memset(ds->fifo, 0, 32);
723 }
724
725 gbc_sound_buffer_index = 0;
726 gbc_sound_last_cpu_ticks = 0;
727 gbc_sound_partial_ticks = 0;
728
729 gbc_sound_master_volume_left = 0;
730 gbc_sound_master_volume_right = 0;
731 gbc_sound_master_volume = 0;
732 memset(wave_samples, 0, 64);
733
734 for(i = 0; i < 4; i++, gs++)
735 {
736 gs->status = GBC_SOUND_INACTIVE;
737 gs->sample_data = square_pattern_duty[2];
738 gs->active_flag = 0;
739 }
740}
741
742void sound_exit()
743{
744 gbc_sound_buffer_index =
745 (sound_buffer_base + audio_buffer_size) % BUFFER_SIZE;
746 SDL_PauseAudio(1);
747 SDL_CondSignal(sound_cv);
748}
749
750void init_sound()
751{
752#ifdef PSP_BUILD
753 audio_buffer_size = (audio_buffer_size_number * 1024) + 3072;
754#elif defined(TAVI_BUILD) || defined(ARM_ARCH)
755 audio_buffer_size = 16 << audio_buffer_size_number;
756// audio_buffer_size = 16384;
757#else
758 audio_buffer_size = 16384;
759#endif
760
761 SDL_AudioSpec desired_spec =
762 {
763 sound_frequency,
764 AUDIO_S16,
765 2,
766 0,
767 audio_buffer_size / 4,
768 0,
769 0,
770 sound_callback,
771 NULL
772 };
773
774 gbc_sound_tick_step =
775 float_to_fp16_16(256.0 / sound_frequency);
776
777 init_noise_table(noise_table15, 32767, 14);
778 init_noise_table(noise_table7, 127, 6);
779
780 reset_sound();
781
782 SDL_OpenAudio(&desired_spec, &sound_settings);
783 sound_frequency = sound_settings.freq;
784 sound_mutex = SDL_CreateMutex();
785 sound_cv = SDL_CreateCond();
786 SDL_PauseAudio(0);
787}
788
789#define sound_savestate_builder(type) \
790void sound_##type##_savestate(file_tag_type savestate_file) \
791{ \
792 file_##type##_variable(savestate_file, sound_on); \
793 file_##type##_variable(savestate_file, sound_buffer_base); \
794 file_##type##_variable(savestate_file, sound_last_cpu_ticks); \
795 file_##type##_variable(savestate_file, gbc_sound_buffer_index); \
796 file_##type##_variable(savestate_file, gbc_sound_last_cpu_ticks); \
797 file_##type##_variable(savestate_file, gbc_sound_partial_ticks); \
798 file_##type##_variable(savestate_file, gbc_sound_master_volume_left); \
799 file_##type##_variable(savestate_file, gbc_sound_master_volume_right); \
800 file_##type##_variable(savestate_file, gbc_sound_master_volume); \
801 file_##type##_array(savestate_file, wave_samples); \
802 file_##type##_array(savestate_file, direct_sound_channel); \
803 file_##type##_array(savestate_file, gbc_sound_channel); \
804} \
805
806sound_savestate_builder(read);
807sound_savestate_builder(write_mem);
808