GP2X: low volume and fast forward
[picodrive.git] / Pico / sound / sound.c
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cc68a136 1// This is part of Pico Library\r
2\r
3// (c) Copyright 2004 Dave, All rights reserved.\r
b542be46 4// (c) Copyright 2006,2007 notaz, All rights reserved.\r
cc68a136 5// Free for non-commercial use.\r
6\r
7// For commercial use, separate licencing terms must be obtained.\r
8\r
9\r
10#include <string.h>\r
cc68a136 11#include "ym2612.h"\r
12#include "sn76496.h"\r
13\r
cc68a136 14#include "../PicoInt.h"\r
4f265db7 15#include "../cd/pcm.h"\r
16#include "mix.h"\r
cc68a136 17\r
4a32f01f 18void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;\r
19\r
4f265db7 20// master int buffer to mix to\r
21static int PsndBuffer[2*44100/50];\r
cc68a136 22\r
cc68a136 23// dac\r
eff55556 24static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
cc68a136 25\r
26// for Pico\r
27int PsndRate=0;\r
28int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
7a93adeb 29int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r
30int PsndLen_exc_cnt=0;\r
cc68a136 31short *PsndOut=NULL; // PCM data buffer\r
32\r
cc68a136 33// sn76496\r
34extern int *sn76496_regs;\r
35\r
36\r
eff55556 37static void dac_recalculate(void)\r
cc68a136 38{\r
39 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r
40\r
41 if(PsndLen <= lines) {\r
42 // shrinking algo\r
7a93adeb 43 dac_cnt = -PsndLen;\r
cc68a136 44 len=1; pos=0;\r
45 dac_info[225] = 1;\r
46\r
47 for(i=226; i != 225; i++) {\r
48 if (i >= lines) i = 0;\r
49 len = 0;\r
50 if(dac_cnt < 0) {\r
51 len=1;\r
52 pos++;\r
53 dac_cnt += lines;\r
54 }\r
55 dac_cnt -= PsndLen;\r
56 dac_info[i] = (pos<<4)|len;\r
57 }\r
58 } else {\r
59 // stretching\r
7a93adeb 60 dac_cnt = PsndLen;\r
cc68a136 61 pos=0;\r
62 for(i = 225; i != 224; i++) {\r
63 if (i >= lines) i = 0;\r
64 len=0;\r
65 while(dac_cnt >= 0) {\r
66 dac_cnt -= lines;\r
67 len++;\r
68 }\r
4f265db7 69 if (i == mid) // midpoint\r
cc68a136 70 while(pos+len < PsndLen/2) {\r
71 dac_cnt -= lines;\r
72 len++;\r
73 }\r
74 dac_cnt += PsndLen;\r
75 dac_info[i] = (pos<<4)|len;\r
76 pos+=len;\r
77 }\r
78 // last sample\r
79 for(len = 0, i = pos; i < PsndLen; i++) len++;\r
7a93adeb 80 if (PsndLen_exc_add) len++;\r
cc68a136 81 dac_info[224] = (pos<<4)|len;\r
82 }\r
7a93adeb 83 //for(i=len=0; i < lines; i++) {\r
84 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r
85 // len+=dac_info[i]&0xf;\r
86 //}\r
87 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r
88 //printf("len total: %i, last pos: %i\n", len, pos);\r
89 //exit(8);\r
cc68a136 90}\r
91\r
92\r
9d917eea 93PICO_INTERNAL void PsndReset(void)\r
cc68a136 94{\r
cc68a136 95 void *ym2612_regs;\r
96\r
cc68a136 97 // also clear the internal registers+addr line\r
98 ym2612_regs = YM2612GetRegs();\r
99 memset(ym2612_regs, 0, 0x200+4);\r
9a8ffeee 100 z80startCycle = z80stopCycle = 0;\r
7a93adeb 101\r
9d917eea 102 PsndRerate(0);\r
cc68a136 103}\r
104\r
105\r
106// to be called after changing sound rate or chips\r
9d917eea 107void PsndRerate(int preserve_state)\r
cc68a136 108{\r
5f8c85be 109 void *state = NULL;\r
7a93adeb 110 int target_fps = Pico.m.pal ? 50 : 60;\r
cc68a136 111\r
7a93adeb 112 // not all rates are supported in MCD mode due to mp3 decoder limitations\r
4f265db7 113 if (PicoMCD & 1) {\r
114 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;\r
7a93adeb 115 PicoOpt |= 8; // force stereo\r
4f265db7 116 }\r
117\r
7a93adeb 118 if (preserve_state) {\r
5f8c85be 119 state = malloc(0x200);\r
120 if (state == NULL) return;\r
121 memcpy(state, YM2612GetRegs(), 0x200);\r
7a93adeb 122 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
123 Pico_mcd->m.audio_offset = mp3_get_offset();\r
124 }\r
cc68a136 125 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
7a93adeb 126 if (preserve_state) {\r
127 // feed it back it's own registers, just like after loading state\r
5f8c85be 128 memcpy(YM2612GetRegs(), state, 0x200);\r
7a93adeb 129 YM2612PicoStateLoad();\r
130 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
131 mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);\r
132 }\r
cc68a136 133\r
7a93adeb 134 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r
cc68a136 135 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
7a93adeb 136 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r
cc68a136 137\r
5f8c85be 138 if (state)\r
139 free(state);\r
140\r
cc68a136 141 // calculate PsndLen\r
7a93adeb 142 PsndLen=PsndRate / target_fps;\r
143 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r
144 PsndLen_exc_cnt=0;\r
cc68a136 145\r
146 // recalculate dac info\r
147 dac_recalculate();\r
4f265db7 148\r
149 if (PicoMCD & 1)\r
150 pcm_set_rate(PsndRate);\r
7a93adeb 151\r
152 // clear all buffers\r
153 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r
154 if (PsndOut)\r
9d917eea 155 PsndClear();\r
4a32f01f 156\r
157 // set mixer\r
158 PsndMix_32_to_16l = (PicoOpt & 8) ? mix_32_to_16l_stereo : mix_32_to_16_mono;\r
cc68a136 159}\r
160\r
161\r
162// This is called once per raster (aka line), but not necessarily for every line\r
9d917eea 163PICO_INTERNAL void Psnd_timers_and_dac(int raster)\r
cc68a136 164{\r
4f265db7 165 int pos, len;\r
166 int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;\r
167// int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);\r
168\r
169 // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r
170 YM2612PicoTick(1);\r
171\r
172 if (!do_dac /*&& !do_pcm*/) return;\r
173\r
174 pos=dac_info[raster], len=pos&0xf;\r
175 if (!len) return;\r
176\r
177 pos>>=4;\r
178\r
179 if (do_dac) {\r
180 short *d = PsndOut + pos*2;\r
181 int dout = *ym2612_dacout;\r
182 if(PicoOpt&8) {\r
183 // some manual loop unrolling here :)\r
184 d[0] = dout;\r
185 if (len > 1) {\r
186 d[2] = dout;\r
7a93adeb 187 if (len > 2)\r
4f265db7 188 d[4] = dout;\r
4f265db7 189 }\r
cc68a136 190 } else {\r
4f265db7 191 short *d = PsndOut + pos;\r
192 d[0] = dout;\r
193 if (len > 1) {\r
194 d[1] = dout;\r
7a93adeb 195 if (len > 2)\r
4f265db7 196 d[2] = dout;\r
4f265db7 197 }\r
cc68a136 198 }\r
199 }\r
200\r
4f265db7 201#if 0\r
202 if (do_pcm) {\r
203 int *d = PsndBuffer;\r
204 d += (PicoOpt&8) ? pos*2 : pos;\r
205 pcm_update(d, len, 1);\r
206 }\r
207#endif\r
208}\r
cc68a136 209\r
cc68a136 210\r
9d917eea 211PICO_INTERNAL void PsndClear(void)\r
4f265db7 212{\r
7a93adeb 213 int len = PsndLen;\r
214 if (PsndLen_exc_add) len++;\r
88b3d7c1 215 if (PicoOpt & 8)\r
216 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned\r
217 else {\r
218 short *out = PsndOut;\r
219 if ((int)out & 2) { *out++ = 0; len--; }\r
220 memset32((int *) out, 0, len/2);\r
221 if (len & 1) out[len-1] = 0;\r
222 }\r
cc68a136 223}\r
224\r
225\r
9d917eea 226PICO_INTERNAL int PsndRender(int offset, int length)\r
cc68a136 227{\r
85f8e929 228 int buf32_updated = 0;\r
4f265db7 229 int *buf32 = PsndBuffer+offset;\r
cc68a136 230 int stereo = (PicoOpt & 8) >> 3;\r
4f265db7 231 // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r
232 int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r
cc68a136 233 offset <<= stereo;\r
234\r
7a93adeb 235 if (offset == 0) { // should happen once per frame\r
236 // compensate for float part of PsndLen\r
237 PsndLen_exc_cnt += PsndLen_exc_add;\r
238 if (PsndLen_exc_cnt >= 0x10000) {\r
239 PsndLen_exc_cnt -= 0x10000;\r
240 length++;\r
241 }\r
242 }\r
243\r
cc68a136 244 // PSG\r
4f265db7 245 if (PicoOpt & 2)\r
cc68a136 246 SN76496Update(PsndOut+offset, length, stereo);\r
247\r
248 // Add in the stereo FM buffer\r
3ec29f01 249 if (PicoOpt & 1) {\r
85f8e929 250 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r
3ec29f01 251 } else\r
fa1e5e29 252 memset32(buf32, 0, length<<stereo);\r
85f8e929 253\r
254//printf("active_chs: %02x\n", buf32_updated);\r
4f265db7 255\r
7a93adeb 256 // CD: PCM sound\r
85f8e929 257 if (do_pcm) {\r
4f265db7 258 pcm_update(buf32, length, stereo);\r
85f8e929 259 //buf32_updated = 1;\r
260 }\r
4f265db7 261\r
7a93adeb 262 // CD: CDDA audio\r
da42200b 263 // CD mode, cdda enabled, not data track, CDC is reading\r
264 if ((PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r
abe0ea43 265 mp3_update(buf32, length, stereo);\r
4f265db7 266\r
267 // convert + limit to normal 16bit output\r
4a32f01f 268 PsndMix_32_to_16l(PsndOut+offset, buf32, length);\r
cc68a136 269\r
7a93adeb 270 return length;\r
cc68a136 271}\r
272\r
273\r
274\r
275#if defined(_USE_MZ80)\r
276\r
277// memhandlers for mz80 core\r
278unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r
279void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r
280\r
281// structures for mz80 core\r
282static struct MemoryReadByte mz80_mem_read[]=\r
283{\r
284 {0x0000,0xffff,mz80_read},\r
285 {(UINT32) -1,(UINT32) -1,NULL}\r
286};\r
287static struct MemoryWriteByte mz80_mem_write[]=\r
288{\r
289 {0x0000,0xffff,mz80_write},\r
290 {(UINT32) -1,(UINT32) -1,NULL}\r
291};\r
292static struct z80PortRead mz80_io_read[] ={\r
293 {(UINT16) -1,(UINT16) -1,NULL}\r
294};\r
295static struct z80PortWrite mz80_io_write[]={\r
296 {(UINT16) -1,(UINT16) -1,NULL}\r
297};\r
298\r
b542be46 299int mz80_run(int cycles)\r
300{\r
301 int ticks_pre = mz80GetElapsedTicks(0);\r
302 mz80exec(cycles);\r
303 return mz80GetElapsedTicks(0) - ticks_pre;\r
304}\r
305\r
cc68a136 306#elif defined(_USE_DRZ80)\r
307\r
b542be46 308struct DrZ80 drZ80;\r
cc68a136 309\r
310static unsigned int DrZ80_rebasePC(unsigned short a)\r
311{\r
312 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r
313 return drZ80.Z80PC_BASE + a;\r
314}\r
315\r
316static unsigned int DrZ80_rebaseSP(unsigned short a)\r
317{\r
318 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r
319 return drZ80.Z80SP_BASE + a;\r
320}\r
321\r
9d917eea 322static void DrZ80_irq_callback()\r
cc68a136 323{\r
9d917eea 324 drZ80.Z80_IRQ = 0; // lower irq when accepted\r
cc68a136 325}\r
9d917eea 326#endif\r
cc68a136 327\r
9d917eea 328#if defined(_USE_DRZ80) || defined(_USE_CZ80)\r
329static unsigned char z80_in(unsigned short p)\r
cc68a136 330{\r
9d917eea 331 elprintf(EL_ANOMALY, "Z80 port %04x read", p);\r
332 return 0xff;\r
cc68a136 333}\r
334\r
9d917eea 335static void z80_out(unsigned short p,unsigned char d)\r
cc68a136 336{\r
9d917eea 337 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);\r
cc68a136 338}\r
cc68a136 339#endif\r
340\r
9d917eea 341\r
cc68a136 342// z80 functionality wrappers\r
eff55556 343PICO_INTERNAL void z80_init(void)\r
cc68a136 344{\r
345#if defined(_USE_MZ80)\r
346 struct mz80context z80;\r
347\r
348 // z80\r
349 mz80init();\r
350 // Modify the default context\r
351 mz80GetContext(&z80);\r
4f265db7 352\r
cc68a136 353 // point mz80 stuff\r
354 z80.z80Base=Pico.zram;\r
355 z80.z80MemRead=mz80_mem_read;\r
356 z80.z80MemWrite=mz80_mem_write;\r
357 z80.z80IoRead=mz80_io_read;\r
358 z80.z80IoWrite=mz80_io_write;\r
4f265db7 359\r
cc68a136 360 mz80SetContext(&z80);\r
361\r
362#elif defined(_USE_DRZ80)\r
cc68a136 363 memset(&drZ80, 0, sizeof(struct DrZ80));\r
364 drZ80.z80_rebasePC=DrZ80_rebasePC;\r
365 drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r
366 drZ80.z80_read8 =z80_read;\r
367 drZ80.z80_read16 =z80_read16;\r
368 drZ80.z80_write8 =z80_write;\r
369 drZ80.z80_write16 =z80_write16;\r
9d917eea 370 drZ80.z80_in =z80_in;\r
371 drZ80.z80_out =z80_out;\r
cc68a136 372 drZ80.z80_irq_callback=DrZ80_irq_callback;\r
a4221917 373\r
374#elif defined(_USE_CZ80)\r
375 memset(&CZ80, 0, sizeof(CZ80));\r
376 Cz80_Init(&CZ80);\r
377 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM\r
c6196c0f 378 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror\r
b542be46 379 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)\r
a4221917 380 Cz80_Set_WriteB(&CZ80, z80_write);\r
9d917eea 381 Cz80_Set_INPort(&CZ80, z80_in);\r
382 Cz80_Set_OUTPort(&CZ80, z80_out);\r
cc68a136 383#endif\r
384}\r
385\r
eff55556 386PICO_INTERNAL void z80_reset(void)\r
cc68a136 387{\r
388#if defined(_USE_MZ80)\r
389 mz80reset();\r
390#elif defined(_USE_DRZ80)\r
391 memset(&drZ80, 0, 0x54);\r
392 drZ80.Z80F = (1<<2); // set ZFlag\r
393 drZ80.Z80F2 = (1<<2); // set ZFlag\r
394 drZ80.Z80IX = 0xFFFF << 16;\r
395 drZ80.Z80IY = 0xFFFF << 16;\r
396 drZ80.Z80IM = 0; // 1?\r
397 drZ80.Z80PC = drZ80.z80_rebasePC(0);\r
398 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r
a4221917 399#elif defined(_USE_CZ80)\r
400 Cz80_Reset(&CZ80);\r
c6196c0f 401 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);\r
402 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);\r
403 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);\r
cc68a136 404#endif\r
405 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r
406}\r
407\r
cc68a136 408\r
eff55556 409PICO_INTERNAL void z80_pack(unsigned char *data)\r
cc68a136 410{\r
411#if defined(_USE_MZ80)\r
412 struct mz80context mz80;\r
413 *(int *)data = 0x00005A6D; // "mZ"\r
414 mz80GetContext(&mz80);\r
415 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r
416#elif defined(_USE_DRZ80)\r
417 *(int *)data = 0x015A7244; // "DrZ" v1\r
418 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
419 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
420 memcpy(data+4, &drZ80, 0x54);\r
a4221917 421#elif defined(_USE_CZ80)\r
422 *(int *)data = 0x00007a43; // "Cz"\r
c5b61ac2 423 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);\r
424 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
cc68a136 425#endif\r
426}\r
427\r
eff55556 428PICO_INTERNAL void z80_unpack(unsigned char *data)\r
cc68a136 429{\r
430#if defined(_USE_MZ80)\r
a4221917 431 if (*(int *)data == 0x00005A6D) { // "mZ" save?\r
cc68a136 432 struct mz80context mz80;\r
433 mz80GetContext(&mz80);\r
434 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r
435 mz80SetContext(&mz80);\r
436 } else {\r
437 z80_reset();\r
438 z80_int();\r
439 }\r
440#elif defined(_USE_DRZ80)\r
a4221917 441 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r
cc68a136 442 memcpy(&drZ80, data+4, 0x54);\r
443 // update bases\r
444 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
445 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
446 } else {\r
447 z80_reset();\r
448 drZ80.Z80IM = 1;\r
449 z80_int(); // try to goto int handler, maybe we won't execute trash there?\r
450 }\r
a4221917 451#elif defined(_USE_CZ80)\r
c5b61ac2 452 if (*(int *)data == 0x00007a43) { // "Cz" save?\r
453 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
454 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));\r
455 } else {\r
a4221917 456 z80_reset();\r
457 z80_int();\r
458 }\r
cc68a136 459#endif\r
460}\r
461\r
eff55556 462PICO_INTERNAL void z80_exit(void)\r
cc68a136 463{\r
464#if defined(_USE_MZ80)\r
465 mz80shutdown();\r
466#endif\r
467}\r
468\r
1820b5a7 469#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)\r
eff55556 470PICO_INTERNAL void z80_debug(char *dstr)\r
cc68a136 471{\r
472#if defined(_USE_DRZ80)\r
0af33fe0 473 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r
a4221917 474#elif defined(_USE_CZ80)\r
475 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);\r
cc68a136 476#endif\r
477}\r
478#endif\r