3 * Copyright (C) 2006 Exophase <exophase@gmail.com>
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.
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.
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
23 u32 global_enable_audio = 1;
25 direct_sound_struct direct_sound_channel[2];
26 gbc_sound_struct gbc_sound_channel[4];
28 u32 sound_frequency = 44100;
30 SDL_AudioSpec sound_settings;
31 SDL_mutex *sound_mutex;
35 u32 audio_buffer_size_number = 1;
37 u32 audio_buffer_size_number = 8;
40 u32 audio_buffer_size;
42 s16 sound_buffer[BUFFER_SIZE];
43 u32 sound_buffer_base = 0;
45 u32 sound_last_cpu_ticks = 0;
46 fixed16_16 gbc_sound_tick_step;
50 // Queue 1, 2, or 4 samples to the top of the DS FIFO, wrap around circularly
52 #define sound_timer_queue(size, value) \
53 *((s##size *)(ds->fifo + ds->fifo_top)) = value; \
54 ds->fifo_top = (ds->fifo_top + 1) % 32; \
56 void sound_timer_queue8(u32 channel, u8 value)
58 direct_sound_struct *ds = direct_sound_channel + channel;
59 sound_timer_queue(8, value);
62 void sound_timer_queue16(u32 channel, u16 value)
64 direct_sound_struct *ds = direct_sound_channel + channel;
65 sound_timer_queue(8, value & 0xFF);
66 sound_timer_queue(8, value >> 8);
69 void sound_timer_queue32(u32 channel, u32 value)
71 direct_sound_struct *ds = direct_sound_channel + channel;
73 sound_timer_queue(8, value & 0xFF);
74 sound_timer_queue(8, (value >> 8) & 0xFF);
75 sound_timer_queue(8, (value >> 16) & 0xFF);
76 sound_timer_queue(8, value >> 24);
79 // Unqueue 1 sample from the base of the DS FIFO and place it on the audio
80 // buffer for as many samples as necessary. If the DS FIFO is 16 bytes or
81 // smaller and if DMA is enabled for the sound channel initiate a DMA transfer
84 #define render_sample_null() \
86 #define render_sample_left() \
87 sound_buffer[buffer_index] += current_sample + \
88 fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \
90 #define render_sample_right() \
91 sound_buffer[buffer_index + 1] += current_sample + \
92 fp16_16_to_u32((next_sample - current_sample) * fifo_fractional) \
94 #define render_sample_both() \
95 dest_sample = current_sample + \
96 fp16_16_to_u32((next_sample - current_sample) * fifo_fractional); \
97 sound_buffer[buffer_index] += dest_sample; \
98 sound_buffer[buffer_index + 1] += dest_sample \
100 #define render_samples(type) \
101 while(fifo_fractional <= 0xFFFF) \
103 render_sample_##type(); \
104 fifo_fractional += frequency_step; \
105 buffer_index = (buffer_index + 2) % BUFFER_SIZE; \
108 void sound_timer(fixed16_16 frequency_step, u32 channel)
110 direct_sound_struct *ds = direct_sound_channel + channel;
112 fixed16_16 fifo_fractional = ds->fifo_fractional;
113 u32 buffer_index = ds->buffer_index;
114 s16 current_sample, next_sample, dest_sample;
116 current_sample = ds->fifo[ds->fifo_base] << 4;
117 ds->fifo_base = (ds->fifo_base + 1) % 32;
118 next_sample = ds->fifo[ds->fifo_base] << 4;
122 if(ds->volume == DIRECT_SOUND_VOLUME_50)
124 current_sample >>= 1;
130 case DIRECT_SOUND_INACTIVE:
131 render_samples(null);
134 case DIRECT_SOUND_RIGHT:
135 render_samples(right);
138 case DIRECT_SOUND_LEFT:
139 render_samples(left);
142 case DIRECT_SOUND_LEFTRIGHT:
143 render_samples(both);
149 render_samples(null);
152 ds->buffer_index = buffer_index;
153 ds->fifo_fractional = fp16_16_fractional_part(fifo_fractional);
155 if(((ds->fifo_top - ds->fifo_base) % 32) <= 16)
157 if(dma[1].direct_sound_channel == channel)
158 dma_transfer(dma + 1);
160 if(dma[2].direct_sound_channel == channel)
161 dma_transfer(dma + 2);
165 void sound_reset_fifo(u32 channel)
167 direct_sound_struct *ds = direct_sound_channel;
169 memset(ds->fifo, 0, 32);
172 // Initial pattern data = 4bits (signed)
173 // Channel volume = 12bits
174 // Envelope volume = 14bits
175 // Master volume = 2bits
177 // Recalculate left and right volume as volume changes.
178 // To calculate the current sample, use (sample * volume) >> 16
180 // Square waves range from -8 (low) to 7 (high)
182 s8 square_pattern_duty[4][8] =
184 { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0xF8, 0xF8, 0xF8 },
185 { 0xF8, 0xF8, 0xF8, 0xF8, 0x07, 0x07, 0xF8, 0xF8 },
186 { 0xF8, 0xF8, 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8 },
187 { 0x07, 0x07, 0x07, 0x07, 0xF8, 0xF8, 0x07, 0x07 },
192 u32 noise_table15[1024];
195 u32 gbc_sound_master_volume_table[4] = { 1, 2, 4, 0 };
197 u32 gbc_sound_channel_volume_table[8] =
209 u32 gbc_sound_envelope_volume_table[16] =
211 fixed_div(0, 15, 14),
212 fixed_div(1, 15, 14),
213 fixed_div(2, 15, 14),
214 fixed_div(3, 15, 14),
215 fixed_div(4, 15, 14),
216 fixed_div(5, 15, 14),
217 fixed_div(6, 15, 14),
218 fixed_div(7, 15, 14),
219 fixed_div(8, 15, 14),
220 fixed_div(9, 15, 14),
221 fixed_div(10, 15, 14),
222 fixed_div(11, 15, 14),
223 fixed_div(12, 15, 14),
224 fixed_div(13, 15, 14),
225 fixed_div(14, 15, 14),
226 fixed_div(15, 15, 14)
229 u32 gbc_sound_buffer_index = 0;
230 u32 gbc_sound_last_cpu_ticks = 0;
231 u32 gbc_sound_partial_ticks = 0;
233 u32 gbc_sound_master_volume_left;
234 u32 gbc_sound_master_volume_right;
235 u32 gbc_sound_master_volume;
237 #define update_volume_channel_envelope(channel) \
238 volume_##channel = gbc_sound_envelope_volume_table[envelope_volume] * \
239 gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \
240 gbc_sound_master_volume_table[gbc_sound_master_volume] \
242 #define update_volume_channel_noenvelope(channel) \
243 volume_##channel = gs->wave_volume * \
244 gbc_sound_channel_volume_table[gbc_sound_master_volume_##channel] * \
245 gbc_sound_master_volume_table[gbc_sound_master_volume] \
247 #define update_volume(type) \
248 update_volume_channel_##type(left); \
249 update_volume_channel_##type(right) \
251 #define update_tone_sweep() \
252 if(gs->sweep_status) \
254 u32 sweep_ticks = gs->sweep_ticks - 1; \
256 if(sweep_ticks == 0) \
258 u32 rate = gs->rate; \
260 if(gs->sweep_direction) \
261 rate = rate - (rate >> gs->sweep_shift); \
263 rate = rate + (rate >> gs->sweep_shift); \
268 frequency_step = float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / \
271 gs->frequency_step = frequency_step; \
274 sweep_ticks = gs->sweep_initial_ticks; \
276 gs->sweep_ticks = sweep_ticks; \
279 #define update_tone_nosweep() \
281 #define update_tone_envelope() \
282 if(gs->envelope_status) \
284 u32 envelope_ticks = gs->envelope_ticks - 1; \
285 envelope_volume = gs->envelope_volume; \
287 if(envelope_ticks == 0) \
289 if(gs->envelope_direction) \
291 if(envelope_volume != 15) \
292 envelope_volume = gs->envelope_volume + 1; \
296 if(envelope_volume != 0) \
297 envelope_volume = gs->envelope_volume - 1; \
300 update_volume(envelope); \
302 gs->envelope_volume = envelope_volume; \
303 gs->envelope_ticks = gs->envelope_initial_ticks; \
307 gs->envelope_ticks = envelope_ticks; \
311 #define update_tone_noenvelope() \
313 #define gbc_sound_synchronize() \
314 while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) > \
315 (audio_buffer_size * 2)) \
317 SDL_CondWait(sound_cv, sound_mutex); \
320 #define update_tone_counters(envelope_op, sweep_op) \
321 tick_counter += gbc_sound_tick_step; \
322 if(tick_counter > 0xFFFF) \
324 if(gs->length_status) \
326 u32 length_ticks = gs->length_ticks - 1; \
327 gs->length_ticks = length_ticks; \
329 if(length_ticks == 0) \
331 gs->active_flag = 0; \
336 update_tone_##envelope_op(); \
337 update_tone_##sweep_op(); \
339 tick_counter &= 0xFFFF; \
342 #define gbc_sound_render_sample_right() \
343 sound_buffer[buffer_index + 1] += (current_sample * volume_right) >> 22 \
345 #define gbc_sound_render_sample_left() \
346 sound_buffer[buffer_index] += (current_sample * volume_left) >> 22 \
348 #define gbc_sound_render_sample_both() \
349 gbc_sound_render_sample_right(); \
350 gbc_sound_render_sample_left() \
352 #define gbc_sound_render_samples(type, sample_length, envelope_op, sweep_op) \
353 for(i = 0; i < buffer_ticks; i++) \
356 sample_data[fp16_16_to_u32(sample_index) % sample_length]; \
357 gbc_sound_render_sample_##type(); \
359 sample_index += frequency_step; \
360 buffer_index = (buffer_index + 2) % BUFFER_SIZE; \
362 update_tone_counters(envelope_op, sweep_op); \
365 #define gbc_noise_wrap_full 32767
367 #define gbc_noise_wrap_half 126
369 #define get_noise_sample_full() \
371 ((s32)(noise_table15[fp16_16_to_u32(sample_index) >> 5] << \
372 (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \
374 #define get_noise_sample_half() \
376 ((s32)(noise_table7[fp16_16_to_u32(sample_index) >> 5] << \
377 (fp16_16_to_u32(sample_index) & 0x1F)) >> 31) & 0x0F \
379 #define gbc_sound_render_noise(type, noise_type, envelope_op, sweep_op) \
380 for(i = 0; i < buffer_ticks; i++) \
382 get_noise_sample_##noise_type(); \
383 gbc_sound_render_sample_##type(); \
385 sample_index += frequency_step; \
387 if(sample_index >= u32_to_fp16_16(gbc_noise_wrap_##noise_type)) \
388 sample_index -= u32_to_fp16_16(gbc_noise_wrap_##noise_type); \
390 buffer_index = (buffer_index + 2) % BUFFER_SIZE; \
391 update_tone_counters(envelope_op, sweep_op); \
394 #define gbc_sound_render_channel(type, sample_length, envelope_op, sweep_op) \
395 buffer_index = gbc_sound_buffer_index; \
396 sample_index = gs->sample_index; \
397 frequency_step = gs->frequency_step; \
398 tick_counter = gs->tick_counter; \
400 update_volume(envelope_op); \
404 case GBC_SOUND_INACTIVE: \
407 case GBC_SOUND_LEFT: \
408 gbc_sound_render_##type(left, sample_length, envelope_op, sweep_op); \
411 case GBC_SOUND_RIGHT: \
412 gbc_sound_render_##type(right, sample_length, envelope_op, sweep_op); \
415 case GBC_SOUND_LEFTRIGHT: \
416 gbc_sound_render_##type(both, sample_length, envelope_op, sweep_op); \
420 gs->sample_index = sample_index; \
421 gs->tick_counter = tick_counter; \
423 #define gbc_sound_load_wave_ram(bank) \
424 wave_bank = wave_samples + (bank * 32); \
425 for(i = 0, i2 = 0; i < 16; i++, i2 += 2) \
427 current_sample = wave_ram[i]; \
428 wave_bank[i2] = (((current_sample >> 4) & 0x0F) - 8); \
429 wave_bank[i2 + 1] = ((current_sample & 0x0F) - 8); \
432 void synchronize_sound()
434 SDL_LockMutex(sound_mutex);
436 gbc_sound_synchronize();
438 SDL_UnlockMutex(sound_mutex);
441 void update_gbc_sound(u32 cpu_ticks)
443 fixed16_16 buffer_ticks = float_to_fp16_16(((float)(cpu_ticks -
444 gbc_sound_last_cpu_ticks) * sound_frequency) / 16777216.0);
446 gbc_sound_struct *gs = gbc_sound_channel;
447 fixed16_16 sample_index, frequency_step;
448 fixed16_16 tick_counter;
450 s32 volume_left, volume_right;
453 u32 sound_status = address16(io_registers, 0x84) & 0xFFF0;
456 u8 *wave_ram = ((u8 *)io_registers) + 0x90;
458 gbc_sound_partial_ticks += fp16_16_fractional_part(buffer_ticks);
459 buffer_ticks = fp16_16_to_u32(buffer_ticks);
461 if(gbc_sound_partial_ticks > 0xFFFF)
464 gbc_sound_partial_ticks &= 0xFFFF;
467 SDL_LockMutex(sound_mutex);
470 if(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) >
471 (audio_buffer_size * 3 / 2))
473 while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) >
474 (audio_buffer_size * 3 / 2))
476 SDL_CondWait(sound_cv, sound_mutex);
480 if(current_frameskip_type == auto_frameskip)
482 sceDisplayWaitVblankStart();
483 real_frame_count = 0;
484 virtual_frame_count = 0;
487 if(current_frameskip_type == auto_frameskip)
492 get_ticks_us(¤t_ticks);
494 next_ticks = ((current_ticks + 16666) / 16667) * 16667;
495 delay_us(next_ticks - current_ticks);
497 get_ticks_us(&frame_count_initial_timestamp);
499 /* prevent frameskip, or it will cause more audio,
500 * then more waiting here, then frame skip again, ... */
501 num_skipped_frames = 100;
509 gs = gbc_sound_channel + 0;
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);
518 gs = gbc_sound_channel + 1;
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);
527 gs = gbc_sound_channel + 2;
528 if(gbc_sound_wave_update)
530 if(gs->wave_bank == 1)
532 gbc_sound_load_wave_ram(1);
536 gbc_sound_load_wave_ram(0);
539 gbc_sound_wave_update = 0;
542 if((gs->active_flag) && (gs->master_enable))
544 sound_status |= 0x04;
545 sample_data = wave_samples;
546 if(gs->wave_type == 0)
548 if(gs->wave_bank == 1)
551 gbc_sound_render_channel(samples, 32, noenvelope, nosweep);
555 gbc_sound_render_channel(samples, 64, noenvelope, nosweep);
559 gs = gbc_sound_channel + 3;
562 sound_status |= 0x08;
563 envelope_volume = gs->envelope_volume;
565 if(gs->noise_type == 1)
567 gbc_sound_render_channel(noise, half, envelope, nosweep);
571 gbc_sound_render_channel(noise, full, envelope, nosweep);
576 address16(io_registers, 0x84) = sound_status;
578 gbc_sound_last_cpu_ticks = cpu_ticks;
579 gbc_sound_buffer_index =
580 (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE;
582 SDL_UnlockMutex(sound_mutex);
584 SDL_CondSignal(sound_cv);
587 #define sound_copy_normal() \
588 current_sample = source[i] \
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++) \
595 sound_copy_##render_type(); \
596 if(current_sample > 2047) \
597 current_sample = 2047; \
598 if(current_sample < -2048) \
599 current_sample = -2048; \
601 stream_base[i] = current_sample << 4; \
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++) \
610 stream_base[i] = 0; \
615 void sound_callback(void *userdata, Uint8 *stream, int length)
617 u32 sample_length = length / 2;
620 s16 *stream_base = (s16 *)stream;
624 SDL_LockMutex(sound_mutex);
626 while(((gbc_sound_buffer_index - sound_buffer_base) % BUFFER_SIZE) <
627 length && !sound_exit_flag)
629 SDL_CondWait(sound_cv, sound_mutex);
632 if(global_enable_audio)
634 if((sound_buffer_base + sample_length) >= BUFFER_SIZE)
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;
644 sound_copy(sound_buffer_base, length, normal);
645 sound_buffer_base += sample_length;
650 if((sound_buffer_base + sample_length) >= BUFFER_SIZE)
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;
660 sound_copy_null(sound_buffer_base, length);
661 sound_buffer_base += sample_length;
665 SDL_CondSignal(sound_cv);
667 SDL_UnlockMutex(sound_mutex);
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 ^_-
676 void init_noise_table(u32 *table, u32 period, u32 bit_length)
678 u32 shift_register = 0xFF;
679 u32 mask = ~(1 << bit_length);
680 s32 table_pos, bit_pos;
682 u32 table_period = (period + 31) / 32;
684 // Bits are stored in reverse order so they can be more easily moved to
685 // bit 31, for sign extended shift down.
687 for(table_pos = 0; table_pos < table_period; table_pos++)
690 for(bit_pos = 31; bit_pos >= 0; bit_pos--)
692 current_entry |= (shift_register & 0x01) << bit_pos;
695 ((1 & (shift_register ^ (shift_register >> 1))) << bit_length) |
696 ((shift_register >> 1) & mask);
699 table[table_pos] = current_entry;
705 direct_sound_struct *ds = direct_sound_channel;
706 gbc_sound_struct *gs = gbc_sound_channel;
710 sound_buffer_base = 0;
711 sound_last_cpu_ticks = 0;
712 memset(sound_buffer, 0, audio_buffer_size);
714 for(i = 0; i < 2; i++, ds++)
716 ds->buffer_index = 0;
717 ds->status = DIRECT_SOUND_INACTIVE;
720 ds->fifo_fractional = 0;
721 ds->last_cpu_ticks = 0;
722 memset(ds->fifo, 0, 32);
725 gbc_sound_buffer_index = 0;
726 gbc_sound_last_cpu_ticks = 0;
727 gbc_sound_partial_ticks = 0;
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);
734 for(i = 0; i < 4; i++, gs++)
736 gs->status = GBC_SOUND_INACTIVE;
737 gs->sample_data = square_pattern_duty[2];
744 gbc_sound_buffer_index =
745 (sound_buffer_base + audio_buffer_size) % BUFFER_SIZE;
748 SDL_CondSignal(sound_cv);
755 audio_buffer_size = (audio_buffer_size_number * 1024) + 3072;
757 audio_buffer_size = 16 << audio_buffer_size_number;
758 // audio_buffer_size = 16384;
761 SDL_AudioSpec desired_spec =
767 audio_buffer_size / 4,
774 gbc_sound_tick_step =
775 float_to_fp16_16(256.0 / sound_frequency);
777 init_noise_table(noise_table15, 32767, 14);
778 init_noise_table(noise_table7, 127, 6);
782 sound_mutex = SDL_CreateMutex();
783 sound_cv = SDL_CreateCond();
785 SDL_OpenAudio(&desired_spec, &sound_settings);
786 sound_frequency = sound_settings.freq;
787 audio_buffer_size = sound_settings.size;
788 u32 i = audio_buffer_size / 16;
789 for (audio_buffer_size_number = 0; i && (i & 1) == 0; i >>= 1)
790 audio_buffer_size_number++;
792 printf("audio: freq %d, size %d\n", sound_frequency, audio_buffer_size);
798 #define sound_savestate_builder(type) \
799 void sound_##type##_savestate(file_tag_type savestate_file) \
801 file_##type##_variable(savestate_file, sound_on); \
802 file_##type##_variable(savestate_file, sound_buffer_base); \
803 file_##type##_variable(savestate_file, sound_last_cpu_ticks); \
804 file_##type##_variable(savestate_file, gbc_sound_buffer_index); \
805 file_##type##_variable(savestate_file, gbc_sound_last_cpu_ticks); \
806 file_##type##_variable(savestate_file, gbc_sound_partial_ticks); \
807 file_##type##_variable(savestate_file, gbc_sound_master_volume_left); \
808 file_##type##_variable(savestate_file, gbc_sound_master_volume_right); \
809 file_##type##_variable(savestate_file, gbc_sound_master_volume); \
810 file_##type##_array(savestate_file, wave_samples); \
811 file_##type##_array(savestate_file, direct_sound_channel); \
812 file_##type##_array(savestate_file, gbc_sound_channel); \
815 sound_savestate_builder(read);
816 sound_savestate_builder(write_mem);