1 /* 2 * Copyright (c) by Uros Bizjak <uros@kss-loka.si> 3 * 4 * Midi synth routines for OPL2/OPL3/OPL4 FM 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #undef DEBUG_ALLOC 23 #undef DEBUG_MIDI 24 25 #include "opl3_voice.h" 26 #include <sound/asoundef.h> 27 28 extern char snd_opl3_regmap[MAX_OPL2_VOICES][4]; 29 30 extern int use_internal_drums; 31 32 /* 33 * The next table looks magical, but it certainly is not. Its values have 34 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception 35 * for i=0. This log-table converts a linear volume-scaling (0..127) to a 36 * logarithmic scaling as present in the FM-synthesizer chips. so : Volume 37 * 64 = 0 db = relative volume 0 and: Volume 32 = -6 db = relative 38 * volume -8 it was implemented as a table because it is only 128 bytes and 39 * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>) 40 */ 41 42 static char opl3_volume_table[128] = 43 { 44 -63, -48, -40, -35, -32, -29, -27, -26, 45 -24, -23, -21, -20, -19, -18, -18, -17, 46 -16, -15, -15, -14, -13, -13, -12, -12, 47 -11, -11, -10, -10, -10, -9, -9, -8, 48 -8, -8, -7, -7, -7, -6, -6, -6, 49 -5, -5, -5, -5, -4, -4, -4, -4, 50 -3, -3, -3, -3, -2, -2, -2, -2, 51 -2, -1, -1, -1, -1, 0, 0, 0, 52 0, 0, 0, 1, 1, 1, 1, 1, 53 1, 2, 2, 2, 2, 2, 2, 2, 54 3, 3, 3, 3, 3, 3, 3, 4, 55 4, 4, 4, 4, 4, 4, 4, 5, 56 5, 5, 5, 5, 5, 5, 5, 5, 57 6, 6, 6, 6, 6, 6, 6, 6, 58 6, 7, 7, 7, 7, 7, 7, 7, 59 7, 7, 7, 8, 8, 8, 8, 8 60 }; 61 62 void snd_opl3_calc_volume(unsigned char *volbyte, int vel, 63 struct snd_midi_channel *chan) 64 { 65 int oldvol, newvol, n; 66 int volume; 67 68 volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127); 69 if (volume > 127) 70 volume = 127; 71 72 oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK); 73 74 newvol = opl3_volume_table[volume] + oldvol; 75 if (newvol > OPL3_TOTAL_LEVEL_MASK) 76 newvol = OPL3_TOTAL_LEVEL_MASK; 77 else if (newvol < 0) 78 newvol = 0; 79 80 n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK); 81 82 *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK); 83 } 84 85 /* 86 * Converts the note frequency to block and fnum values for the FM chip 87 */ 88 static short opl3_note_table[16] = 89 { 90 305, 323, /* for pitch bending, -2 semitones */ 91 343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647, 92 686, 726 /* for pitch bending, +2 semitones */ 93 }; 94 95 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum, 96 int note, struct snd_midi_channel *chan) 97 { 98 int block = ((note / 12) & 0x07) - 1; 99 int idx = (note % 12) + 2; 100 int freq; 101 102 if (chan->midi_pitchbend) { 103 int pitchbend = chan->midi_pitchbend; 104 int segment; 105 106 if (pitchbend > 0x1FFF) 107 pitchbend = 0x1FFF; 108 109 segment = pitchbend / 0x1000; 110 freq = opl3_note_table[idx+segment]; 111 freq += ((opl3_note_table[idx+segment+1] - freq) * 112 (pitchbend % 0x1000)) / 0x1000; 113 } else { 114 freq = opl3_note_table[idx]; 115 } 116 117 *fnum = (unsigned char) freq; 118 *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) | 119 ((block << 2) & OPL3_BLOCKNUM_MASK); 120 } 121 122 123 #ifdef DEBUG_ALLOC 124 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) { 125 int i; 126 char *str = "x.24"; 127 128 printk("time %.5i: %s [%.2i]: ", opl3->use_time, s, voice); 129 for (i = 0; i < opl3->max_voices; i++) 130 printk("%c", *(str + opl3->voices[i].state + 1)); 131 printk("\n"); 132 } 133 #endif 134 135 /* 136 * Get a FM voice (channel) to play a note on. 137 */ 138 static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op, 139 struct snd_midi_channel *chan) { 140 int chan_4op_1; /* first voice for 4op instrument */ 141 int chan_4op_2; /* second voice for 4op instrument */ 142 143 struct snd_opl3_voice *vp, *vp2; 144 unsigned int voice_time; 145 int i; 146 147 #ifdef DEBUG_ALLOC 148 char *alloc_type[3] = { "FREE ", "CHEAP ", "EXPENSIVE" }; 149 #endif 150 151 /* This is our "allocation cost" table */ 152 enum { 153 FREE = 0, CHEAP, EXPENSIVE, END 154 }; 155 156 /* Keeps track of what we are finding */ 157 struct best { 158 unsigned int time; 159 int voice; 160 } best[END]; 161 struct best *bp; 162 163 for (i = 0; i < END; i++) { 164 best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */; 165 best[i].voice = -1; 166 } 167 168 /* Look through all the channels for the most suitable. */ 169 for (i = 0; i < opl3->max_voices; i++) { 170 vp = &opl3->voices[i]; 171 172 if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL) 173 /* skip unavailable channels, allocated by 174 drum voices or by bounded 4op voices) */ 175 continue; 176 177 voice_time = vp->time; 178 bp = best; 179 180 chan_4op_1 = ((i < 3) || (i > 8 && i < 12)); 181 chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15)); 182 if (instr_4op) { 183 /* allocate 4op voice */ 184 /* skip channels unavailable to 4op instrument */ 185 if (!chan_4op_1) 186 continue; 187 188 if (vp->state) 189 /* kill one voice, CHEAP */ 190 bp++; 191 /* get state of bounded 2op channel 192 to be allocated for 4op instrument */ 193 vp2 = &opl3->voices[i + 3]; 194 if (vp2->state == SNDRV_OPL3_ST_ON_2OP) { 195 /* kill two voices, EXPENSIVE */ 196 bp++; 197 voice_time = (voice_time > vp->time) ? 198 voice_time : vp->time; 199 } 200 } else { 201 /* allocate 2op voice */ 202 if ((chan_4op_1) || (chan_4op_2)) 203 /* use bounded channels for 2op, CHEAP */ 204 bp++; 205 else if (vp->state) 206 /* kill one voice on 2op channel, CHEAP */ 207 bp++; 208 /* raise kill cost to EXPENSIVE for all channels */ 209 if (vp->state) 210 bp++; 211 } 212 if (voice_time < bp->time) { 213 bp->time = voice_time; 214 bp->voice = i; 215 } 216 } 217 218 for (i = 0; i < END; i++) { 219 if (best[i].voice >= 0) { 220 #ifdef DEBUG_ALLOC 221 printk("%s %iop allocation on voice %i\n", 222 alloc_type[i], instr_4op ? 4 : 2, 223 best[i].voice); 224 #endif 225 return best[i].voice; 226 } 227 } 228 /* not found */ 229 return -1; 230 } 231 232 /* ------------------------------ */ 233 234 /* 235 * System timer interrupt function 236 */ 237 void snd_opl3_timer_func(unsigned long data) 238 { 239 240 struct snd_opl3 *opl3 = (struct snd_opl3 *)data; 241 unsigned long flags; 242 int again = 0; 243 int i; 244 245 spin_lock_irqsave(&opl3->sys_timer_lock, flags); 246 for (i = 0; i < opl3->max_voices; i++) { 247 struct snd_opl3_voice *vp = &opl3->voices[i]; 248 if (vp->state > 0 && vp->note_off_check) { 249 if (vp->note_off == jiffies) 250 snd_opl3_note_off(opl3, vp->note, 0, vp->chan); 251 else 252 again++; 253 } 254 } 255 if (again) { 256 opl3->tlist.expires = jiffies + 1; /* invoke again */ 257 add_timer(&opl3->tlist); 258 } else { 259 opl3->sys_timer_status = 0; 260 } 261 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags); 262 } 263 264 /* 265 * Start system timer 266 */ 267 static void snd_opl3_start_timer(struct snd_opl3 *opl3) 268 { 269 unsigned long flags; 270 spin_lock_irqsave(&opl3->sys_timer_lock, flags); 271 if (! opl3->sys_timer_status) { 272 opl3->tlist.expires = jiffies + 1; 273 add_timer(&opl3->tlist); 274 opl3->sys_timer_status = 1; 275 } 276 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags); 277 } 278 279 /* ------------------------------ */ 280 281 282 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = { 283 0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14 284 }; 285 286 /* 287 * Start a note. 288 */ 289 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan) 290 { 291 struct snd_opl3 *opl3; 292 struct snd_seq_instr wanted; 293 struct snd_seq_kinstr *kinstr; 294 int instr_4op; 295 296 int voice; 297 struct snd_opl3_voice *vp, *vp2; 298 unsigned short connect_mask; 299 unsigned char connection; 300 unsigned char vol_op[4]; 301 302 int extra_prg = 0; 303 304 unsigned short reg_side; 305 unsigned char op_offset; 306 unsigned char voice_offset; 307 unsigned short opl3_reg; 308 unsigned char reg_val; 309 310 int key = note; 311 unsigned char fnum, blocknum; 312 int i; 313 314 struct fm_instrument *fm; 315 unsigned long flags; 316 317 opl3 = p; 318 319 #ifdef DEBUG_MIDI 320 snd_printk("Note on, ch %i, inst %i, note %i, vel %i\n", 321 chan->number, chan->midi_program, note, vel); 322 #endif 323 wanted.cluster = 0; 324 wanted.std = SNDRV_SEQ_INSTR_TYPE2_OPL2_3; 325 326 /* in SYNTH mode, application takes care of voices */ 327 /* in SEQ mode, drum voice numbers are notes on drum channel */ 328 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 329 if (chan->drum_channel) { 330 /* percussion instruments are located in bank 128 */ 331 wanted.bank = 128; 332 wanted.prg = note; 333 } else { 334 wanted.bank = chan->gm_bank_select; 335 wanted.prg = chan->midi_program; 336 } 337 } else { 338 /* Prepare for OSS mode */ 339 if (chan->number >= MAX_OPL3_VOICES) 340 return; 341 342 /* OSS instruments are located in bank 127 */ 343 wanted.bank = 127; 344 wanted.prg = chan->midi_program; 345 } 346 347 spin_lock_irqsave(&opl3->voice_lock, flags); 348 349 if (use_internal_drums) { 350 snd_opl3_drum_switch(opl3, note, vel, 1, chan); 351 spin_unlock_irqrestore(&opl3->voice_lock, flags); 352 return; 353 } 354 355 __extra_prg: 356 kinstr = snd_seq_instr_find(opl3->ilist, &wanted, 1, 0); 357 if (kinstr == NULL) { 358 spin_unlock_irqrestore(&opl3->voice_lock, flags); 359 return; 360 } 361 362 fm = KINSTR_DATA(kinstr); 363 364 switch (fm->type) { 365 case FM_PATCH_OPL2: 366 instr_4op = 0; 367 break; 368 case FM_PATCH_OPL3: 369 if (opl3->hardware >= OPL3_HW_OPL3) { 370 instr_4op = 1; 371 break; 372 } 373 default: 374 snd_seq_instr_free_use(opl3->ilist, kinstr); 375 spin_unlock_irqrestore(&opl3->voice_lock, flags); 376 return; 377 } 378 379 #ifdef DEBUG_MIDI 380 snd_printk(" --> OPL%i instrument: %s\n", 381 instr_4op ? 3 : 2, kinstr->name); 382 #endif 383 /* in SYNTH mode, application takes care of voices */ 384 /* in SEQ mode, allocate voice on free OPL3 channel */ 385 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 386 voice = opl3_get_voice(opl3, instr_4op, chan); 387 } else { 388 /* remap OSS voice */ 389 voice = snd_opl3_oss_map[chan->number]; 390 } 391 392 if (voice < MAX_OPL2_VOICES) { 393 /* Left register block for voices 0 .. 8 */ 394 reg_side = OPL3_LEFT; 395 voice_offset = voice; 396 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07; 397 } else { 398 /* Right register block for voices 9 .. 17 */ 399 reg_side = OPL3_RIGHT; 400 voice_offset = voice - MAX_OPL2_VOICES; 401 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38; 402 } 403 404 /* kill voice on channel */ 405 vp = &opl3->voices[voice]; 406 if (vp->state > 0) { 407 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 408 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT; 409 opl3->command(opl3, opl3_reg, reg_val); 410 } 411 if (instr_4op) { 412 vp2 = &opl3->voices[voice + 3]; 413 if (vp->state > 0) { 414 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + 415 voice_offset + 3); 416 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT; 417 opl3->command(opl3, opl3_reg, reg_val); 418 } 419 } 420 421 /* set connection register */ 422 if (instr_4op) { 423 if ((opl3->connection_reg ^ connect_mask) & connect_mask) { 424 opl3->connection_reg |= connect_mask; 425 /* set connection bit */ 426 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT; 427 opl3->command(opl3, opl3_reg, opl3->connection_reg); 428 } 429 } else { 430 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) { 431 opl3->connection_reg &= ~connect_mask; 432 /* clear connection bit */ 433 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT; 434 opl3->command(opl3, opl3_reg, opl3->connection_reg); 435 } 436 } 437 438 #ifdef DEBUG_MIDI 439 snd_printk(" --> setting OPL3 connection: 0x%x\n", 440 opl3->connection_reg); 441 #endif 442 /* 443 * calculate volume depending on connection 444 * between FM operators (see include/opl3.h) 445 */ 446 for (i = 0; i < (instr_4op ? 4 : 2); i++) 447 vol_op[i] = fm->op[i].ksl_level; 448 449 connection = fm->feedback_connection[0] & 0x01; 450 if (instr_4op) { 451 connection <<= 1; 452 connection |= fm->feedback_connection[1] & 0x01; 453 454 snd_opl3_calc_volume(&vol_op[3], vel, chan); 455 switch (connection) { 456 case 0x03: 457 snd_opl3_calc_volume(&vol_op[2], vel, chan); 458 /* fallthru */ 459 case 0x02: 460 snd_opl3_calc_volume(&vol_op[0], vel, chan); 461 break; 462 case 0x01: 463 snd_opl3_calc_volume(&vol_op[1], vel, chan); 464 } 465 } else { 466 snd_opl3_calc_volume(&vol_op[1], vel, chan); 467 if (connection) 468 snd_opl3_calc_volume(&vol_op[0], vel, chan); 469 } 470 471 /* Program the FM voice characteristics */ 472 for (i = 0; i < (instr_4op ? 4 : 2); i++) { 473 #ifdef DEBUG_MIDI 474 snd_printk(" --> programming operator %i\n", i); 475 #endif 476 op_offset = snd_opl3_regmap[voice_offset][i]; 477 478 /* Set OPL3 AM_VIB register of requested voice/operator */ 479 reg_val = fm->op[i].am_vib; 480 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset); 481 opl3->command(opl3, opl3_reg, reg_val); 482 483 /* Set OPL3 KSL_LEVEL register of requested voice/operator */ 484 reg_val = vol_op[i]; 485 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset); 486 opl3->command(opl3, opl3_reg, reg_val); 487 488 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */ 489 reg_val = fm->op[i].attack_decay; 490 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset); 491 opl3->command(opl3, opl3_reg, reg_val); 492 493 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */ 494 reg_val = fm->op[i].sustain_release; 495 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset); 496 opl3->command(opl3, opl3_reg, reg_val); 497 498 /* Select waveform */ 499 reg_val = fm->op[i].wave_select; 500 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset); 501 opl3->command(opl3, opl3_reg, reg_val); 502 } 503 504 /* Set operator feedback and 2op inter-operator connection */ 505 reg_val = fm->feedback_connection[0]; 506 /* Set output voice connection */ 507 reg_val |= OPL3_STEREO_BITS; 508 if (chan->gm_pan < 43) 509 reg_val &= ~OPL3_VOICE_TO_RIGHT; 510 if (chan->gm_pan > 85) 511 reg_val &= ~OPL3_VOICE_TO_LEFT; 512 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset); 513 opl3->command(opl3, opl3_reg, reg_val); 514 515 if (instr_4op) { 516 /* Set 4op inter-operator connection */ 517 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT; 518 /* Set output voice connection */ 519 reg_val |= OPL3_STEREO_BITS; 520 if (chan->gm_pan < 43) 521 reg_val &= ~OPL3_VOICE_TO_RIGHT; 522 if (chan->gm_pan > 85) 523 reg_val &= ~OPL3_VOICE_TO_LEFT; 524 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + 525 voice_offset + 3); 526 opl3->command(opl3, opl3_reg, reg_val); 527 } 528 529 /* 530 * Special treatment of percussion notes for fm: 531 * Requested pitch is really program, and pitch for 532 * device is whatever was specified in the patch library. 533 */ 534 if (fm->fix_key) 535 note = fm->fix_key; 536 /* 537 * use transpose if defined in patch library 538 */ 539 if (fm->trnsps) 540 note += (fm->trnsps - 64); 541 542 snd_opl3_calc_pitch(&fnum, &blocknum, note, chan); 543 544 /* Set OPL3 FNUM_LOW register of requested voice */ 545 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset); 546 opl3->command(opl3, opl3_reg, fnum); 547 548 opl3->voices[voice].keyon_reg = blocknum; 549 550 /* Set output sound flag */ 551 blocknum |= OPL3_KEYON_BIT; 552 553 #ifdef DEBUG_MIDI 554 snd_printk(" --> trigger voice %i\n", voice); 555 #endif 556 /* Set OPL3 KEYON_BLOCK register of requested voice */ 557 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 558 opl3->command(opl3, opl3_reg, blocknum); 559 560 /* kill note after fixed duration (in centiseconds) */ 561 if (fm->fix_dur) { 562 opl3->voices[voice].note_off = jiffies + 563 (fm->fix_dur * HZ) / 100; 564 snd_opl3_start_timer(opl3); 565 opl3->voices[voice].note_off_check = 1; 566 } else 567 opl3->voices[voice].note_off_check = 0; 568 569 /* get extra pgm, but avoid possible loops */ 570 extra_prg = (extra_prg) ? 0 : fm->modes; 571 572 snd_seq_instr_free_use(opl3->ilist, kinstr); 573 574 /* do the bookkeeping */ 575 vp->time = opl3->use_time++; 576 vp->note = key; 577 vp->chan = chan; 578 579 if (instr_4op) { 580 vp->state = SNDRV_OPL3_ST_ON_4OP; 581 582 vp2 = &opl3->voices[voice + 3]; 583 vp2->time = opl3->use_time++; 584 vp2->note = key; 585 vp2->chan = chan; 586 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL; 587 } else { 588 if (vp->state == SNDRV_OPL3_ST_ON_4OP) { 589 /* 4op killed by 2op, release bounded voice */ 590 vp2 = &opl3->voices[voice + 3]; 591 vp2->time = opl3->use_time++; 592 vp2->state = SNDRV_OPL3_ST_OFF; 593 } 594 vp->state = SNDRV_OPL3_ST_ON_2OP; 595 } 596 597 #ifdef DEBUG_ALLOC 598 debug_alloc(opl3, "note on ", voice); 599 #endif 600 601 /* allocate extra program if specified in patch library */ 602 if (extra_prg) { 603 if (extra_prg > 128) { 604 wanted.bank = 128; 605 /* percussions start at 35 */ 606 wanted.prg = extra_prg - 128 + 35 - 1; 607 } else { 608 wanted.bank = 0; 609 wanted.prg = extra_prg - 1; 610 } 611 #ifdef DEBUG_MIDI 612 snd_printk(" *** allocating extra program\n"); 613 #endif 614 goto __extra_prg; 615 } 616 spin_unlock_irqrestore(&opl3->voice_lock, flags); 617 } 618 619 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice) 620 { 621 unsigned short reg_side; 622 unsigned char voice_offset; 623 unsigned short opl3_reg; 624 625 struct snd_opl3_voice *vp, *vp2; 626 627 snd_assert(voice < MAX_OPL3_VOICES, return); 628 629 vp = &opl3->voices[voice]; 630 if (voice < MAX_OPL2_VOICES) { 631 /* Left register block for voices 0 .. 8 */ 632 reg_side = OPL3_LEFT; 633 voice_offset = voice; 634 } else { 635 /* Right register block for voices 9 .. 17 */ 636 reg_side = OPL3_RIGHT; 637 voice_offset = voice - MAX_OPL2_VOICES; 638 } 639 640 /* kill voice */ 641 #ifdef DEBUG_MIDI 642 snd_printk(" --> kill voice %i\n", voice); 643 #endif 644 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 645 /* clear Key ON bit */ 646 opl3->command(opl3, opl3_reg, vp->keyon_reg); 647 648 /* do the bookkeeping */ 649 vp->time = opl3->use_time++; 650 651 if (vp->state == SNDRV_OPL3_ST_ON_4OP) { 652 vp2 = &opl3->voices[voice + 3]; 653 654 vp2->time = opl3->use_time++; 655 vp2->state = SNDRV_OPL3_ST_OFF; 656 } 657 vp->state = SNDRV_OPL3_ST_OFF; 658 #ifdef DEBUG_ALLOC 659 debug_alloc(opl3, "note off", voice); 660 #endif 661 662 } 663 664 /* 665 * Release a note in response to a midi note off. 666 */ 667 void snd_opl3_note_off(void *p, int note, int vel, struct snd_midi_channel *chan) 668 { 669 struct snd_opl3 *opl3; 670 671 int voice; 672 struct snd_opl3_voice *vp; 673 674 unsigned long flags; 675 676 opl3 = p; 677 678 #ifdef DEBUG_MIDI 679 snd_printk("Note off, ch %i, inst %i, note %i\n", 680 chan->number, chan->midi_program, note); 681 #endif 682 683 spin_lock_irqsave(&opl3->voice_lock, flags); 684 685 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 686 if (chan->drum_channel && use_internal_drums) { 687 snd_opl3_drum_switch(opl3, note, vel, 0, chan); 688 spin_unlock_irqrestore(&opl3->voice_lock, flags); 689 return; 690 } 691 /* this loop will hopefully kill all extra voices, because 692 they are grouped by the same channel and note values */ 693 for (voice = 0; voice < opl3->max_voices; voice++) { 694 vp = &opl3->voices[voice]; 695 if (vp->state > 0 && vp->chan == chan && vp->note == note) { 696 snd_opl3_kill_voice(opl3, voice); 697 } 698 } 699 } else { 700 /* remap OSS voices */ 701 if (chan->number < MAX_OPL3_VOICES) { 702 voice = snd_opl3_oss_map[chan->number]; 703 snd_opl3_kill_voice(opl3, voice); 704 } 705 } 706 spin_unlock_irqrestore(&opl3->voice_lock, flags); 707 } 708 709 /* 710 * key pressure change 711 */ 712 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan) 713 { 714 struct snd_opl3 *opl3; 715 716 opl3 = p; 717 #ifdef DEBUG_MIDI 718 snd_printk("Key pressure, ch#: %i, inst#: %i\n", 719 chan->number, chan->midi_program); 720 #endif 721 } 722 723 /* 724 * terminate note 725 */ 726 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan) 727 { 728 struct snd_opl3 *opl3; 729 730 opl3 = p; 731 #ifdef DEBUG_MIDI 732 snd_printk("Terminate note, ch#: %i, inst#: %i\n", 733 chan->number, chan->midi_program); 734 #endif 735 } 736 737 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice) 738 { 739 unsigned short reg_side; 740 unsigned char voice_offset; 741 unsigned short opl3_reg; 742 743 unsigned char fnum, blocknum; 744 745 struct snd_opl3_voice *vp; 746 747 snd_assert(voice < MAX_OPL3_VOICES, return); 748 749 vp = &opl3->voices[voice]; 750 if (vp->chan == NULL) 751 return; /* not allocated? */ 752 753 if (voice < MAX_OPL2_VOICES) { 754 /* Left register block for voices 0 .. 8 */ 755 reg_side = OPL3_LEFT; 756 voice_offset = voice; 757 } else { 758 /* Right register block for voices 9 .. 17 */ 759 reg_side = OPL3_RIGHT; 760 voice_offset = voice - MAX_OPL2_VOICES; 761 } 762 763 snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan); 764 765 /* Set OPL3 FNUM_LOW register of requested voice */ 766 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset); 767 opl3->command(opl3, opl3_reg, fnum); 768 769 vp->keyon_reg = blocknum; 770 771 /* Set output sound flag */ 772 blocknum |= OPL3_KEYON_BIT; 773 774 /* Set OPL3 KEYON_BLOCK register of requested voice */ 775 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset); 776 opl3->command(opl3, opl3_reg, blocknum); 777 778 vp->time = opl3->use_time++; 779 } 780 781 /* 782 * Update voice pitch controller 783 */ 784 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan) 785 { 786 int voice; 787 struct snd_opl3_voice *vp; 788 789 unsigned long flags; 790 791 spin_lock_irqsave(&opl3->voice_lock, flags); 792 793 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) { 794 for (voice = 0; voice < opl3->max_voices; voice++) { 795 vp = &opl3->voices[voice]; 796 if (vp->state > 0 && vp->chan == chan) { 797 snd_opl3_update_pitch(opl3, voice); 798 } 799 } 800 } else { 801 /* remap OSS voices */ 802 if (chan->number < MAX_OPL3_VOICES) { 803 voice = snd_opl3_oss_map[chan->number]; 804 snd_opl3_update_pitch(opl3, voice); 805 } 806 } 807 spin_unlock_irqrestore(&opl3->voice_lock, flags); 808 } 809 810 /* 811 * Deal with a controler type event. This includes all types of 812 * control events, not just the midi controllers 813 */ 814 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan) 815 { 816 struct snd_opl3 *opl3; 817 818 opl3 = p; 819 #ifdef DEBUG_MIDI 820 snd_printk("Controller, TYPE = %i, ch#: %i, inst#: %i\n", 821 type, chan->number, chan->midi_program); 822 #endif 823 824 switch (type) { 825 case MIDI_CTL_MSB_MODWHEEL: 826 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63) 827 opl3->drum_reg |= OPL3_VIBRATO_DEPTH; 828 else 829 opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH; 830 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 831 opl3->drum_reg); 832 break; 833 case MIDI_CTL_E2_TREMOLO_DEPTH: 834 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63) 835 opl3->drum_reg |= OPL3_TREMOLO_DEPTH; 836 else 837 opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH; 838 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 839 opl3->drum_reg); 840 break; 841 case MIDI_CTL_PITCHBEND: 842 snd_opl3_pitch_ctrl(opl3, chan); 843 break; 844 } 845 } 846 847 /* 848 * NRPN events 849 */ 850 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan, 851 struct snd_midi_channel_set *chset) 852 { 853 struct snd_opl3 *opl3; 854 855 opl3 = p; 856 #ifdef DEBUG_MIDI 857 snd_printk("NRPN, ch#: %i, inst#: %i\n", 858 chan->number, chan->midi_program); 859 #endif 860 } 861 862 /* 863 * receive sysex 864 */ 865 void snd_opl3_sysex(void *p, unsigned char *buf, int len, 866 int parsed, struct snd_midi_channel_set *chset) 867 { 868 struct snd_opl3 *opl3; 869 870 opl3 = p; 871 #ifdef DEBUG_MIDI 872 snd_printk("SYSEX\n"); 873 #endif 874 } 875