| 1 | /*\r |
| 2 | * PicoDrive\r |
| 3 | * (c) Copyright Dave, 2004\r |
| 4 | * (C) notaz, 2006-2009\r |
| 5 | *\r |
| 6 | * This work is licensed under the terms of MAME license.\r |
| 7 | * See COPYING file in the top-level directory.\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/cue.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, psg\r |
| 23 | static unsigned short dac_info[312+4]; // pos in sample buffer\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, PsndPsgLine;\r |
| 34 | short *PsndOut=NULL; // PCM data buffer\r |
| 35 | static int PsndLen_use;\r |
| 36 | \r |
| 37 | // timers\r |
| 38 | int timer_a_next_oflow, timer_a_step; // in z80 cycles\r |
| 39 | int timer_b_next_oflow, timer_b_step;\r |
| 40 | \r |
| 41 | // sn76496\r |
| 42 | extern int *sn76496_regs;\r |
| 43 | \r |
| 44 | \r |
| 45 | static void dac_recalculate(void)\r |
| 46 | {\r |
| 47 | int i, dac_cnt, pos, len, lines = Pico.m.pal ? 313 : 262, mid = Pico.m.pal ? 68 : 93;\r |
| 48 | \r |
| 49 | if (PsndLen <= lines)\r |
| 50 | {\r |
| 51 | // shrinking algo\r |
| 52 | dac_cnt = -PsndLen;\r |
| 53 | len=1; pos=0;\r |
| 54 | dac_info[225] = 1;\r |
| 55 | \r |
| 56 | for(i=226; i != 225; i++)\r |
| 57 | {\r |
| 58 | if (i >= lines) i = 0;\r |
| 59 | if(dac_cnt < 0) {\r |
| 60 | pos++;\r |
| 61 | dac_cnt += lines;\r |
| 62 | }\r |
| 63 | dac_cnt -= PsndLen;\r |
| 64 | dac_info[i] = pos;\r |
| 65 | }\r |
| 66 | }\r |
| 67 | else\r |
| 68 | {\r |
| 69 | // stretching\r |
| 70 | dac_cnt = PsndLen;\r |
| 71 | pos=0;\r |
| 72 | for(i = 225; i != 224; i++)\r |
| 73 | {\r |
| 74 | if (i >= lines) i = 0;\r |
| 75 | len=0;\r |
| 76 | while(dac_cnt >= 0) {\r |
| 77 | dac_cnt -= lines;\r |
| 78 | len++;\r |
| 79 | }\r |
| 80 | if (i == mid) // midpoint\r |
| 81 | while(pos+len < PsndLen/2) {\r |
| 82 | dac_cnt -= lines;\r |
| 83 | len++;\r |
| 84 | }\r |
| 85 | dac_cnt += PsndLen;\r |
| 86 | pos += len;\r |
| 87 | dac_info[i] = pos;\r |
| 88 | }\r |
| 89 | }\r |
| 90 | for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)\r |
| 91 | dac_info[i] = dac_info[0];\r |
| 92 | }\r |
| 93 | \r |
| 94 | \r |
| 95 | PICO_INTERNAL void PsndReset(void)\r |
| 96 | {\r |
| 97 | // PsndRerate calls YM2612Init, which also resets\r |
| 98 | PsndRerate(0);\r |
| 99 | timers_reset();\r |
| 100 | }\r |
| 101 | \r |
| 102 | \r |
| 103 | // to be called after changing sound rate or chips\r |
| 104 | void PsndRerate(int preserve_state)\r |
| 105 | {\r |
| 106 | void *state = NULL;\r |
| 107 | int target_fps = Pico.m.pal ? 50 : 60;\r |
| 108 | \r |
| 109 | if (preserve_state) {\r |
| 110 | state = malloc(0x204);\r |
| 111 | if (state == NULL) return;\r |
| 112 | ym2612_pack_state();\r |
| 113 | memcpy(state, YM2612GetRegs(), 0x204);\r |
| 114 | }\r |
| 115 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
| 116 | if (preserve_state) {\r |
| 117 | // feed it back it's own registers, just like after loading state\r |
| 118 | memcpy(YM2612GetRegs(), state, 0x204);\r |
| 119 | ym2612_unpack_state();\r |
| 120 | }\r |
| 121 | \r |
| 122 | if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r |
| 123 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
| 124 | if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r |
| 125 | \r |
| 126 | if (state)\r |
| 127 | free(state);\r |
| 128 | \r |
| 129 | // calculate PsndLen\r |
| 130 | PsndLen=PsndRate / target_fps;\r |
| 131 | PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r |
| 132 | PsndLen_exc_cnt=0;\r |
| 133 | \r |
| 134 | // recalculate dac info\r |
| 135 | dac_recalculate();\r |
| 136 | \r |
| 137 | // clear all buffers\r |
| 138 | memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r |
| 139 | memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));\r |
| 140 | if (PsndOut)\r |
| 141 | PsndClear();\r |
| 142 | \r |
| 143 | // set mixer\r |
| 144 | PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;\r |
| 145 | \r |
| 146 | if (PicoAHW & PAHW_PICO)\r |
| 147 | PicoReratePico();\r |
| 148 | }\r |
| 149 | \r |
| 150 | \r |
| 151 | PICO_INTERNAL void PsndStartFrame(void)\r |
| 152 | {\r |
| 153 | // compensate for float part of PsndLen\r |
| 154 | PsndLen_use = PsndLen;\r |
| 155 | PsndLen_exc_cnt += PsndLen_exc_add;\r |
| 156 | if (PsndLen_exc_cnt >= 0x10000) {\r |
| 157 | PsndLen_exc_cnt -= 0x10000;\r |
| 158 | PsndLen_use++;\r |
| 159 | }\r |
| 160 | \r |
| 161 | PsndDacLine = PsndPsgLine = 0;\r |
| 162 | emustatus &= ~1;\r |
| 163 | dac_info[224] = PsndLen_use;\r |
| 164 | }\r |
| 165 | \r |
| 166 | PICO_INTERNAL void PsndDoDAC(int line_to)\r |
| 167 | {\r |
| 168 | int pos, pos1, len;\r |
| 169 | int dout = ym2612.dacout;\r |
| 170 | int line_from = PsndDacLine;\r |
| 171 | \r |
| 172 | if (line_to >= 313)\r |
| 173 | line_to = 312;\r |
| 174 | \r |
| 175 | pos = dac_info[line_from];\r |
| 176 | pos1 = dac_info[line_to + 1];\r |
| 177 | len = pos1 - pos;\r |
| 178 | if (len <= 0)\r |
| 179 | return;\r |
| 180 | \r |
| 181 | PsndDacLine = line_to + 1;\r |
| 182 | \r |
| 183 | if (!PsndOut)\r |
| 184 | return;\r |
| 185 | \r |
| 186 | if (PicoOpt & POPT_EN_STEREO) {\r |
| 187 | short *d = PsndOut + pos*2;\r |
| 188 | for (; len > 0; len--, d+=2) *d += dout;\r |
| 189 | } else {\r |
| 190 | short *d = PsndOut + pos;\r |
| 191 | for (; len > 0; len--, d++) *d += dout;\r |
| 192 | }\r |
| 193 | }\r |
| 194 | \r |
| 195 | PICO_INTERNAL void PsndDoPSG(int line_to)\r |
| 196 | {\r |
| 197 | int line_from = PsndPsgLine;\r |
| 198 | int pos, pos1, len;\r |
| 199 | int stereo = 0;\r |
| 200 | \r |
| 201 | if (line_to >= 313)\r |
| 202 | line_to = 312;\r |
| 203 | \r |
| 204 | pos = dac_info[line_from];\r |
| 205 | pos1 = dac_info[line_to + 1];\r |
| 206 | len = pos1 - pos;\r |
| 207 | //elprintf(EL_STATUS, "%3d %3d %3d %3d %3d",\r |
| 208 | // pos, pos1, len, line_from, line_to);\r |
| 209 | if (len <= 0)\r |
| 210 | return;\r |
| 211 | \r |
| 212 | PsndPsgLine = line_to + 1;\r |
| 213 | \r |
| 214 | if (!PsndOut || !(PicoOpt & POPT_EN_PSG))\r |
| 215 | return;\r |
| 216 | \r |
| 217 | if (PicoOpt & POPT_EN_STEREO) {\r |
| 218 | stereo = 1;\r |
| 219 | pos <<= 1;\r |
| 220 | }\r |
| 221 | SN76496Update(PsndOut + pos, len, stereo);\r |
| 222 | }\r |
| 223 | \r |
| 224 | // cdda\r |
| 225 | static void cdda_raw_update(int *buffer, int length)\r |
| 226 | {\r |
| 227 | int ret, cdda_bytes, mult = 1;\r |
| 228 | \r |
| 229 | cdda_bytes = length*4;\r |
| 230 | if (PsndRate <= 22050 + 100) mult = 2;\r |
| 231 | if (PsndRate < 22050 - 100) mult = 4;\r |
| 232 | cdda_bytes *= mult;\r |
| 233 | \r |
| 234 | ret = pm_read(cdda_out_buffer, cdda_bytes, Pico_mcd->cdda_stream);\r |
| 235 | if (ret < cdda_bytes) {\r |
| 236 | memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);\r |
| 237 | Pico_mcd->cdda_stream = NULL;\r |
| 238 | return;\r |
| 239 | }\r |
| 240 | \r |
| 241 | // now mix\r |
| 242 | switch (mult) {\r |
| 243 | case 1: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;\r |
| 244 | case 2: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;\r |
| 245 | case 4: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;\r |
| 246 | }\r |
| 247 | }\r |
| 248 | \r |
| 249 | void cdda_start_play(int lba_base, int lba_offset, int lb_len)\r |
| 250 | {\r |
| 251 | if (Pico_mcd->cdda_type == CT_MP3)\r |
| 252 | {\r |
| 253 | int pos1024 = 0;\r |
| 254 | \r |
| 255 | if (lba_offset)\r |
| 256 | pos1024 = lba_offset * 1024 / lb_len;\r |
| 257 | \r |
| 258 | mp3_start_play(Pico_mcd->cdda_stream, pos1024);\r |
| 259 | return;\r |
| 260 | }\r |
| 261 | \r |
| 262 | pm_seek(Pico_mcd->cdda_stream, (lba_base + lba_offset) * 2352, SEEK_SET);\r |
| 263 | if (Pico_mcd->cdda_type == CT_WAV)\r |
| 264 | {\r |
| 265 | // skip headers, assume it's 44kHz stereo uncompressed\r |
| 266 | pm_seek(Pico_mcd->cdda_stream, 44, SEEK_CUR);\r |
| 267 | }\r |
| 268 | }\r |
| 269 | \r |
| 270 | \r |
| 271 | PICO_INTERNAL void PsndClear(void)\r |
| 272 | {\r |
| 273 | int len = PsndLen;\r |
| 274 | if (PsndLen_exc_add) len++;\r |
| 275 | if (PicoOpt & POPT_EN_STEREO)\r |
| 276 | memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned\r |
| 277 | else {\r |
| 278 | short *out = PsndOut;\r |
| 279 | if ((long)out & 2) { *out++ = 0; len--; }\r |
| 280 | memset32((int *) out, 0, len/2);\r |
| 281 | if (len & 1) out[len-1] = 0;\r |
| 282 | }\r |
| 283 | }\r |
| 284 | \r |
| 285 | \r |
| 286 | static int PsndRender(int offset, int length)\r |
| 287 | {\r |
| 288 | int buf32_updated = 0;\r |
| 289 | int *buf32 = PsndBuffer+offset;\r |
| 290 | int stereo = (PicoOpt & 8) >> 3;\r |
| 291 | \r |
| 292 | offset <<= stereo;\r |
| 293 | \r |
| 294 | pprof_start(sound);\r |
| 295 | \r |
| 296 | if (PicoAHW & PAHW_PICO) {\r |
| 297 | PicoPicoPCMUpdate(PsndOut+offset, length, stereo);\r |
| 298 | return length;\r |
| 299 | }\r |
| 300 | \r |
| 301 | // Add in the stereo FM buffer\r |
| 302 | if (PicoOpt & POPT_EN_FM) {\r |
| 303 | buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r |
| 304 | } else\r |
| 305 | memset32(buf32, 0, length<<stereo);\r |
| 306 | \r |
| 307 | //printf("active_chs: %02x\n", buf32_updated);\r |
| 308 | (void)buf32_updated;\r |
| 309 | \r |
| 310 | // CD: PCM sound\r |
| 311 | if (PicoAHW & PAHW_MCD) {\r |
| 312 | pcd_pcm_update(buf32, length, stereo);\r |
| 313 | //buf32_updated = 1;\r |
| 314 | }\r |
| 315 | \r |
| 316 | // CD: CDDA audio\r |
| 317 | // CD mode, cdda enabled, not data track, CDC is reading\r |
| 318 | if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA)\r |
| 319 | && Pico_mcd->cdda_stream != NULL\r |
| 320 | && !(Pico_mcd->s68k_regs[0x36] & 1))\r |
| 321 | {\r |
| 322 | // note: only 44, 22 and 11 kHz supported, with forced stereo\r |
| 323 | if (Pico_mcd->cdda_type == CT_MP3)\r |
| 324 | mp3_update(buf32, length, stereo);\r |
| 325 | else\r |
| 326 | cdda_raw_update(buf32, length);\r |
| 327 | }\r |
| 328 | \r |
| 329 | if ((PicoAHW & PAHW_32X) && (PicoOpt & POPT_EN_PWM))\r |
| 330 | p32x_pwm_update(buf32, length, stereo);\r |
| 331 | \r |
| 332 | // convert + limit to normal 16bit output\r |
| 333 | PsndMix_32_to_16l(PsndOut+offset, buf32, length);\r |
| 334 | \r |
| 335 | pprof_end(sound);\r |
| 336 | \r |
| 337 | return length;\r |
| 338 | }\r |
| 339 | \r |
| 340 | // to be called on 224 or line_sample scanlines only\r |
| 341 | PICO_INTERNAL void PsndGetSamples(int y)\r |
| 342 | {\r |
| 343 | static int curr_pos = 0;\r |
| 344 | \r |
| 345 | if (ym2612.dacen && PsndDacLine < y)\r |
| 346 | PsndDoDAC(y - 1);\r |
| 347 | PsndDoPSG(y - 1);\r |
| 348 | \r |
| 349 | if (y == 224)\r |
| 350 | {\r |
| 351 | if (emustatus & 2)\r |
| 352 | curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);\r |
| 353 | else curr_pos = PsndRender(0, PsndLen_use);\r |
| 354 | if (emustatus & 1)\r |
| 355 | emustatus |= 2;\r |
| 356 | else emustatus &= ~2;\r |
| 357 | if (PicoWriteSound)\r |
| 358 | PicoWriteSound(curr_pos * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));\r |
| 359 | // clear sound buffer\r |
| 360 | PsndClear();\r |
| 361 | PsndDacLine = 224;\r |
| 362 | dac_info[224] = 0;\r |
| 363 | }\r |
| 364 | else if (emustatus & 3) {\r |
| 365 | emustatus|= 2;\r |
| 366 | emustatus&=~1;\r |
| 367 | curr_pos = PsndRender(0, PsndLen/2);\r |
| 368 | }\r |
| 369 | }\r |
| 370 | \r |
| 371 | PICO_INTERNAL void PsndGetSamplesMS(void)\r |
| 372 | {\r |
| 373 | int stereo = (PicoOpt & 8) >> 3;\r |
| 374 | int length = PsndLen_use;\r |
| 375 | \r |
| 376 | // PSG\r |
| 377 | if (PicoOpt & POPT_EN_PSG)\r |
| 378 | SN76496Update(PsndOut, length, stereo);\r |
| 379 | \r |
| 380 | // upmix to "stereo" if needed\r |
| 381 | if (stereo) {\r |
| 382 | int i, *p;\r |
| 383 | for (i = length, p = (void *)PsndOut; i > 0; i--, p++)\r |
| 384 | *p |= *p << 16;\r |
| 385 | }\r |
| 386 | \r |
| 387 | if (PicoWriteSound != NULL)\r |
| 388 | PicoWriteSound(length * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));\r |
| 389 | PsndClear();\r |
| 390 | }\r |
| 391 | \r |
| 392 | // vim:shiftwidth=2:ts=2:expandtab\r |