| 1 | // This is part of Pico Library\r |
| 2 | \r |
| 3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
| 4 | // (c) Copyright 2006,2007 notaz, All rights reserved.\r |
| 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 |
| 11 | #include "ym2612.h"\r |
| 12 | #include "sn76496.h"\r |
| 13 | #include "../pico_int.h"\r |
| 14 | #include "../cd/pcm.h"\r |
| 15 | #include "mix.h"\r |
| 16 | \r |
| 17 | void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;\r |
| 18 | \r |
| 19 | // master int buffer to mix to\r |
| 20 | static int PsndBuffer[2*(44100+100)/50];\r |
| 21 | \r |
| 22 | // dac\r |
| 23 | static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r |
| 24 | \r |
| 25 | // cdda output buffer\r |
| 26 | short cdda_out_buffer[2*1152];\r |
| 27 | \r |
| 28 | // for Pico\r |
| 29 | int PsndRate=0;\r |
| 30 | int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r |
| 31 | int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r |
| 32 | int PsndLen_exc_cnt=0;\r |
| 33 | int PsndDacLine=0;\r |
| 34 | short *PsndOut=NULL; // PCM data buffer\r |
| 35 | \r |
| 36 | // timers\r |
| 37 | int timer_a_next_oflow, timer_a_step; // in z80 cycles\r |
| 38 | int timer_b_next_oflow, timer_b_step;\r |
| 39 | \r |
| 40 | // sn76496\r |
| 41 | extern int *sn76496_regs;\r |
| 42 | \r |
| 43 | \r |
| 44 | static void dac_recalculate(void)\r |
| 45 | {\r |
| 46 | int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r |
| 47 | \r |
| 48 | if (PsndLen <= lines)\r |
| 49 | {\r |
| 50 | // shrinking algo\r |
| 51 | dac_cnt = -PsndLen;\r |
| 52 | len=1; pos=0;\r |
| 53 | dac_info[225] = 1;\r |
| 54 | \r |
| 55 | for(i=226; i != 225; i++)\r |
| 56 | {\r |
| 57 | if (i >= lines) i = 0;\r |
| 58 | len = 0;\r |
| 59 | if(dac_cnt < 0) {\r |
| 60 | len=1;\r |
| 61 | pos++;\r |
| 62 | dac_cnt += lines;\r |
| 63 | }\r |
| 64 | dac_cnt -= PsndLen;\r |
| 65 | dac_info[i] = (pos<<4)|len;\r |
| 66 | }\r |
| 67 | }\r |
| 68 | else\r |
| 69 | {\r |
| 70 | // stretching\r |
| 71 | dac_cnt = PsndLen;\r |
| 72 | pos=0;\r |
| 73 | for(i = 225; i != 224; i++)\r |
| 74 | {\r |
| 75 | if (i >= lines) i = 0;\r |
| 76 | len=0;\r |
| 77 | while(dac_cnt >= 0) {\r |
| 78 | dac_cnt -= lines;\r |
| 79 | len++;\r |
| 80 | }\r |
| 81 | if (i == mid) // midpoint\r |
| 82 | while(pos+len < PsndLen/2) {\r |
| 83 | dac_cnt -= lines;\r |
| 84 | len++;\r |
| 85 | }\r |
| 86 | dac_cnt += PsndLen;\r |
| 87 | dac_info[i] = (pos<<4)|len;\r |
| 88 | pos+=len;\r |
| 89 | }\r |
| 90 | // last sample\r |
| 91 | for(len = 0, i = pos; i < PsndLen; i++) len++;\r |
| 92 | if (PsndLen_exc_add) len++;\r |
| 93 | dac_info[224] = (pos<<4)|len;\r |
| 94 | }\r |
| 95 | mid = (dac_info[lines-1] & 0xfff0) + ((dac_info[lines-1] & 0xf) << 4);\r |
| 96 | for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)\r |
| 97 | dac_info[i] = mid;\r |
| 98 | //for(i=len=0; i < lines; i++) {\r |
| 99 | // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r |
| 100 | // len+=dac_info[i]&0xf;\r |
| 101 | //}\r |
| 102 | //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r |
| 103 | //printf("len total: %i, last pos: %i\n", len, pos);\r |
| 104 | //exit(8);\r |
| 105 | }\r |
| 106 | \r |
| 107 | \r |
| 108 | PICO_INTERNAL void PsndReset(void)\r |
| 109 | {\r |
| 110 | // PsndRerate calls YM2612Init, which also resets\r |
| 111 | PsndRerate(0);\r |
| 112 | timers_reset();\r |
| 113 | }\r |
| 114 | \r |
| 115 | \r |
| 116 | // to be called after changing sound rate or chips\r |
| 117 | void PsndRerate(int preserve_state)\r |
| 118 | {\r |
| 119 | void *state = NULL;\r |
| 120 | int target_fps = Pico.m.pal ? 50 : 60;\r |
| 121 | \r |
| 122 | // not all rates are supported in MCD mode due to mp3 decoder limitations\r |
| 123 | if (PicoAHW & PAHW_MCD) {\r |
| 124 | if (!(11025-100 <= PsndRate && PsndRate <= 11025+100) &&\r |
| 125 | !(22050-100 <= PsndRate && PsndRate <= 22050+100) &&\r |
| 126 | !(44100-100 <= PsndRate && PsndRate <= 44100+100))\r |
| 127 | PsndRate = 22050;\r |
| 128 | PicoOpt |= POPT_EN_STEREO; // force stereo\r |
| 129 | }\r |
| 130 | \r |
| 131 | if (preserve_state) {\r |
| 132 | state = malloc(0x204);\r |
| 133 | if (state == NULL) return;\r |
| 134 | ym2612_pack_state();\r |
| 135 | memcpy(state, YM2612GetRegs(), 0x204);\r |
| 136 | }\r |
| 137 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
| 138 | if (preserve_state) {\r |
| 139 | // feed it back it's own registers, just like after loading state\r |
| 140 | memcpy(YM2612GetRegs(), state, 0x204);\r |
| 141 | ym2612_unpack_state();\r |
| 142 | if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r |
| 143 | cdda_start_play();\r |
| 144 | }\r |
| 145 | \r |
| 146 | if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r |
| 147 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
| 148 | if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r |
| 149 | \r |
| 150 | if (state)\r |
| 151 | free(state);\r |
| 152 | \r |
| 153 | // calculate PsndLen\r |
| 154 | PsndLen=PsndRate / target_fps;\r |
| 155 | PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r |
| 156 | PsndLen_exc_cnt=0;\r |
| 157 | \r |
| 158 | // recalculate dac info\r |
| 159 | dac_recalculate();\r |
| 160 | \r |
| 161 | if (PicoAHW & PAHW_MCD)\r |
| 162 | pcm_set_rate(PsndRate);\r |
| 163 | \r |
| 164 | // clear all buffers\r |
| 165 | memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r |
| 166 | memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));\r |
| 167 | if (PsndOut)\r |
| 168 | PsndClear();\r |
| 169 | \r |
| 170 | // set mixer\r |
| 171 | PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;\r |
| 172 | \r |
| 173 | if (PicoAHW & PAHW_PICO)\r |
| 174 | PicoReratePico();\r |
| 175 | }\r |
| 176 | \r |
| 177 | \r |
| 178 | PICO_INTERNAL void PsndDoDAC(int line_to)\r |
| 179 | {\r |
| 180 | int pos, pos1, len;\r |
| 181 | int dout = ym2612.dacout;\r |
| 182 | int line_from = PsndDacLine;\r |
| 183 | \r |
| 184 | PsndDacLine = line_to + 1;\r |
| 185 | \r |
| 186 | pos =dac_info[line_from]>>4;\r |
| 187 | pos1=dac_info[line_to];\r |
| 188 | len = ((pos1>>4)-pos) + (pos1&0xf);\r |
| 189 | if (!len) return;\r |
| 190 | \r |
| 191 | if (PicoOpt & POPT_EN_STEREO) {\r |
| 192 | short *d = PsndOut + pos*2;\r |
| 193 | for (; len > 0; len--, d+=2) *d = dout;\r |
| 194 | } else {\r |
| 195 | short *d = PsndOut + pos;\r |
| 196 | for (; len > 0; len--, d++) *d = dout;\r |
| 197 | }\r |
| 198 | \r |
| 199 | #if 0\r |
| 200 | if (do_pcm) {\r |
| 201 | int *d = PsndBuffer;\r |
| 202 | d += (PicoOpt&8) ? pos*2 : pos;\r |
| 203 | pcm_update(d, len, 1);\r |
| 204 | }\r |
| 205 | #endif\r |
| 206 | }\r |
| 207 | \r |
| 208 | // cdda\r |
| 209 | static pm_file *cdda_stream = NULL;\r |
| 210 | \r |
| 211 | static void cdda_raw_update(int *buffer, int length)\r |
| 212 | {\r |
| 213 | int ret, cdda_bytes, mult = 1;\r |
| 214 | if (cdda_stream == NULL)\r |
| 215 | return;\r |
| 216 | \r |
| 217 | cdda_bytes = length*4;\r |
| 218 | if (PsndRate <= 22050 + 100) mult = 2;\r |
| 219 | if (PsndRate < 22050 - 100) mult = 4;\r |
| 220 | cdda_bytes *= mult;\r |
| 221 | \r |
| 222 | ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);\r |
| 223 | if (ret < cdda_bytes) {\r |
| 224 | memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);\r |
| 225 | cdda_stream = NULL;\r |
| 226 | return;\r |
| 227 | }\r |
| 228 | \r |
| 229 | // now mix\r |
| 230 | switch (mult) {\r |
| 231 | case 1: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;\r |
| 232 | case 2: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;\r |
| 233 | case 4: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;\r |
| 234 | }\r |
| 235 | }\r |
| 236 | \r |
| 237 | PICO_INTERNAL void cdda_start_play(void)\r |
| 238 | {\r |
| 239 | int lba_offset, index, lba_length, i;\r |
| 240 | \r |
| 241 | elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);\r |
| 242 | \r |
| 243 | index = Pico_mcd->scd.Cur_Track - 1;\r |
| 244 | \r |
| 245 | lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);\r |
| 246 | if (lba_offset < 0) lba_offset = 0;\r |
| 247 | lba_offset += Pico_mcd->TOC.Tracks[index].Offset;\r |
| 248 | \r |
| 249 | // find the actual file for this track\r |
| 250 | for (i = index; i > 0; i--)\r |
| 251 | if (Pico_mcd->TOC.Tracks[i].F != NULL) break;\r |
| 252 | \r |
| 253 | if (Pico_mcd->TOC.Tracks[i].F == NULL) {\r |
| 254 | elprintf(EL_STATUS|EL_ANOMALY, "no track?!");\r |
| 255 | return;\r |
| 256 | }\r |
| 257 | \r |
| 258 | if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_MP3)\r |
| 259 | {\r |
| 260 | int pos1024 = 0;\r |
| 261 | \r |
| 262 | lba_length = Pico_mcd->TOC.Tracks[i].Length;\r |
| 263 | for (i++; i < Pico_mcd->TOC.Last_Track; i++) {\r |
| 264 | if (Pico_mcd->TOC.Tracks[i].F != NULL) break;\r |
| 265 | lba_length += Pico_mcd->TOC.Tracks[i].Length;\r |
| 266 | }\r |
| 267 | \r |
| 268 | if (lba_offset)\r |
| 269 | pos1024 = lba_offset * 1024 / lba_length;\r |
| 270 | \r |
| 271 | mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);\r |
| 272 | return;\r |
| 273 | }\r |
| 274 | \r |
| 275 | cdda_stream = Pico_mcd->TOC.Tracks[i].F;\r |
| 276 | PicoCDBufferFlush(); // buffering relies on fp not being touched\r |
| 277 | pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);\r |
| 278 | if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_WAV)\r |
| 279 | {\r |
| 280 | // skip headers, assume it's 44kHz stereo uncompressed\r |
| 281 | pm_seek(cdda_stream, 44, SEEK_CUR);\r |
| 282 | }\r |
| 283 | }\r |
| 284 | \r |
| 285 | \r |
| 286 | PICO_INTERNAL void PsndClear(void)\r |
| 287 | {\r |
| 288 | int len = PsndLen;\r |
| 289 | if (PsndLen_exc_add) len++;\r |
| 290 | if (PicoOpt & POPT_EN_STEREO)\r |
| 291 | memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned\r |
| 292 | else {\r |
| 293 | short *out = PsndOut;\r |
| 294 | if ((long)out & 2) { *out++ = 0; len--; }\r |
| 295 | memset32((int *) out, 0, len/2);\r |
| 296 | if (len & 1) out[len-1] = 0;\r |
| 297 | }\r |
| 298 | }\r |
| 299 | \r |
| 300 | \r |
| 301 | static int PsndRender(int offset, int length)\r |
| 302 | {\r |
| 303 | int buf32_updated = 0;\r |
| 304 | int *buf32 = PsndBuffer+offset;\r |
| 305 | int stereo = (PicoOpt & 8) >> 3;\r |
| 306 | // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r |
| 307 | int do_pcm = (PicoAHW & PAHW_MCD) && (PicoOpt&POPT_EN_MCD_PCM) &&\r |
| 308 | (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r |
| 309 | offset <<= stereo;\r |
| 310 | \r |
| 311 | pprof_start(sound);\r |
| 312 | \r |
| 313 | #if !SIMPLE_WRITE_SOUND\r |
| 314 | if (offset == 0) { // should happen once per frame\r |
| 315 | // compensate for float part of PsndLen\r |
| 316 | PsndLen_exc_cnt += PsndLen_exc_add;\r |
| 317 | if (PsndLen_exc_cnt >= 0x10000) {\r |
| 318 | PsndLen_exc_cnt -= 0x10000;\r |
| 319 | length++;\r |
| 320 | }\r |
| 321 | }\r |
| 322 | #endif\r |
| 323 | \r |
| 324 | // PSG\r |
| 325 | if (PicoOpt & POPT_EN_PSG)\r |
| 326 | SN76496Update(PsndOut+offset, length, stereo);\r |
| 327 | \r |
| 328 | if (PicoAHW & PAHW_PICO) {\r |
| 329 | PicoPicoPCMUpdate(PsndOut+offset, length, stereo);\r |
| 330 | return length;\r |
| 331 | }\r |
| 332 | \r |
| 333 | // Add in the stereo FM buffer\r |
| 334 | if (PicoOpt & POPT_EN_FM) {\r |
| 335 | buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r |
| 336 | } else\r |
| 337 | memset32(buf32, 0, length<<stereo);\r |
| 338 | \r |
| 339 | //printf("active_chs: %02x\n", buf32_updated);\r |
| 340 | \r |
| 341 | // CD: PCM sound\r |
| 342 | if (do_pcm) {\r |
| 343 | pcm_update(buf32, length, stereo);\r |
| 344 | //buf32_updated = 1;\r |
| 345 | }\r |
| 346 | \r |
| 347 | // CD: CDDA audio\r |
| 348 | // CD mode, cdda enabled, not data track, CDC is reading\r |
| 349 | if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&\r |
| 350 | !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r |
| 351 | {\r |
| 352 | // note: only 44, 22 and 11 kHz supported, with forced stereo\r |
| 353 | int index = Pico_mcd->scd.Cur_Track - 1;\r |
| 354 | \r |
| 355 | if (Pico_mcd->TOC.Tracks[index].ftype == TYPE_MP3)\r |
| 356 | mp3_update(buf32, length, stereo);\r |
| 357 | else\r |
| 358 | cdda_raw_update(buf32, length);\r |
| 359 | }\r |
| 360 | \r |
| 361 | if ((PicoAHW & PAHW_32X) && (PicoOpt & POPT_EN_PWM))\r |
| 362 | p32x_pwm_update(buf32, length, stereo);\r |
| 363 | \r |
| 364 | // convert + limit to normal 16bit output\r |
| 365 | PsndMix_32_to_16l(PsndOut+offset, buf32, length);\r |
| 366 | \r |
| 367 | pprof_end(sound);\r |
| 368 | \r |
| 369 | return length;\r |
| 370 | }\r |
| 371 | \r |
| 372 | // to be called on 224 or line_sample scanlines only\r |
| 373 | PICO_INTERNAL void PsndGetSamples(int y)\r |
| 374 | {\r |
| 375 | #if SIMPLE_WRITE_SOUND\r |
| 376 | if (y != 224) return;\r |
| 377 | PsndRender(0, PsndLen);\r |
| 378 | if (PicoWriteSound)\r |
| 379 | PicoWriteSound(PsndLen * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));\r |
| 380 | PsndClear();\r |
| 381 | #else\r |
| 382 | static int curr_pos = 0;\r |
| 383 | \r |
| 384 | if (y == 224)\r |
| 385 | {\r |
| 386 | if (emustatus & 2)\r |
| 387 | curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);\r |
| 388 | else curr_pos = PsndRender(0, PsndLen);\r |
| 389 | if (emustatus & 1)\r |
| 390 | emustatus |= 2;\r |
| 391 | else emustatus &= ~2;\r |
| 392 | if (PicoWriteSound)\r |
| 393 | PicoWriteSound(curr_pos * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));\r |
| 394 | // clear sound buffer\r |
| 395 | PsndClear();\r |
| 396 | }\r |
| 397 | else if (emustatus & 3) {\r |
| 398 | emustatus|= 2;\r |
| 399 | emustatus&=~1;\r |
| 400 | curr_pos = PsndRender(0, PsndLen/2);\r |
| 401 | }\r |
| 402 | #endif\r |
| 403 | }\r |
| 404 | \r |
| 405 | PICO_INTERNAL void PsndGetSamplesMS(void)\r |
| 406 | {\r |
| 407 | int stereo = (PicoOpt & 8) >> 3;\r |
| 408 | int length = PsndLen;\r |
| 409 | \r |
| 410 | #if !SIMPLE_WRITE_SOUND\r |
| 411 | // compensate for float part of PsndLen\r |
| 412 | PsndLen_exc_cnt += PsndLen_exc_add;\r |
| 413 | if (PsndLen_exc_cnt >= 0x10000) {\r |
| 414 | PsndLen_exc_cnt -= 0x10000;\r |
| 415 | length++;\r |
| 416 | }\r |
| 417 | #endif\r |
| 418 | \r |
| 419 | // PSG\r |
| 420 | if (PicoOpt & POPT_EN_PSG)\r |
| 421 | SN76496Update(PsndOut, length, stereo);\r |
| 422 | \r |
| 423 | // upmix to "stereo" if needed\r |
| 424 | if (stereo) {\r |
| 425 | int i, *p;\r |
| 426 | for (i = length, p = (void *)PsndOut; i > 0; i--, p++)\r |
| 427 | *p |= *p << 16;\r |
| 428 | }\r |
| 429 | \r |
| 430 | if (PicoWriteSound != NULL)\r |
| 431 | PicoWriteSound(length * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));\r |
| 432 | PsndClear();\r |
| 433 | }\r |
| 434 | \r |