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 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
29 struct snd_midi_channel *chan);
30 /*
31 * The next table looks magical, but it certainly is not. Its values have
32 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
33 * for i=0. This log-table converts a linear volume-scaling (0..127) to a
34 * logarithmic scaling as present in the FM-synthesizer chips. so : Volume
35 * 64 = 0 db = relative volume 0 and: Volume 32 = -6 db = relative
36 * volume -8 it was implemented as a table because it is only 128 bytes and
37 * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
38 */
39
40 static char opl3_volume_table[128] =
41 {
42 -63, -48, -40, -35, -32, -29, -27, -26,
43 -24, -23, -21, -20, -19, -18, -18, -17,
44 -16, -15, -15, -14, -13, -13, -12, -12,
45 -11, -11, -10, -10, -10, -9, -9, -8,
46 -8, -8, -7, -7, -7, -6, -6, -6,
47 -5, -5, -5, -5, -4, -4, -4, -4,
48 -3, -3, -3, -3, -2, -2, -2, -2,
49 -2, -1, -1, -1, -1, 0, 0, 0,
50 0, 0, 0, 1, 1, 1, 1, 1,
51 1, 2, 2, 2, 2, 2, 2, 2,
52 3, 3, 3, 3, 3, 3, 3, 4,
53 4, 4, 4, 4, 4, 4, 4, 5,
54 5, 5, 5, 5, 5, 5, 5, 5,
55 6, 6, 6, 6, 6, 6, 6, 6,
56 6, 7, 7, 7, 7, 7, 7, 7,
57 7, 7, 7, 8, 8, 8, 8, 8
58 };
59
snd_opl3_calc_volume(unsigned char * volbyte,int vel,struct snd_midi_channel * chan)60 void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
61 struct snd_midi_channel *chan)
62 {
63 int oldvol, newvol, n;
64 int volume;
65
66 volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
67 if (volume > 127)
68 volume = 127;
69
70 oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);
71
72 newvol = opl3_volume_table[volume] + oldvol;
73 if (newvol > OPL3_TOTAL_LEVEL_MASK)
74 newvol = OPL3_TOTAL_LEVEL_MASK;
75 else if (newvol < 0)
76 newvol = 0;
77
78 n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);
79
80 *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
81 }
82
83 /*
84 * Converts the note frequency to block and fnum values for the FM chip
85 */
86 static short opl3_note_table[16] =
87 {
88 305, 323, /* for pitch bending, -2 semitones */
89 343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
90 686, 726 /* for pitch bending, +2 semitones */
91 };
92
snd_opl3_calc_pitch(unsigned char * fnum,unsigned char * blocknum,int note,struct snd_midi_channel * chan)93 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
94 int note, struct snd_midi_channel *chan)
95 {
96 int block = ((note / 12) & 0x07) - 1;
97 int idx = (note % 12) + 2;
98 int freq;
99
100 if (chan->midi_pitchbend) {
101 int pitchbend = chan->midi_pitchbend;
102 int segment;
103
104 if (pitchbend < -0x2000)
105 pitchbend = -0x2000;
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
debug_alloc(struct snd_opl3 * opl3,char * s,int voice)124 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
125 int i;
126 char *str = "x.24";
127
128 printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
129 for (i = 0; i < opl3->max_voices; i++)
130 printk(KERN_CONT "%c", *(str + opl3->voices[i].state + 1));
131 printk(KERN_CONT "\n");
132 }
133 #endif
134
135 /*
136 * Get a FM voice (channel) to play a note on.
137 */
opl3_get_voice(struct snd_opl3 * opl3,int instr_4op,struct snd_midi_channel * chan)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(KERN_DEBUG "%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 */
snd_opl3_timer_func(struct timer_list * t)237 void snd_opl3_timer_func(struct timer_list *t)
238 {
239
240 struct snd_opl3 *opl3 = from_timer(opl3, t, tlist);
241 unsigned long flags;
242 int again = 0;
243 int i;
244
245 spin_lock_irqsave(&opl3->voice_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_unsafe(opl3, vp->note, 0,
251 vp->chan);
252 else
253 again++;
254 }
255 }
256 spin_unlock_irqrestore(&opl3->voice_lock, flags);
257
258 spin_lock_irqsave(&opl3->sys_timer_lock, flags);
259 if (again)
260 mod_timer(&opl3->tlist, jiffies + 1); /* invoke again */
261 else
262 opl3->sys_timer_status = 0;
263 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
264 }
265
266 /*
267 * Start system timer
268 */
snd_opl3_start_timer(struct snd_opl3 * opl3)269 static void snd_opl3_start_timer(struct snd_opl3 *opl3)
270 {
271 unsigned long flags;
272 spin_lock_irqsave(&opl3->sys_timer_lock, flags);
273 if (! opl3->sys_timer_status) {
274 mod_timer(&opl3->tlist, jiffies + 1);
275 opl3->sys_timer_status = 1;
276 }
277 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
278 }
279
280 /* ------------------------------ */
281
282
283 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
284 0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
285 };
286
287 /*
288 * Start a note.
289 */
snd_opl3_note_on(void * p,int note,int vel,struct snd_midi_channel * chan)290 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
291 {
292 struct snd_opl3 *opl3;
293 int instr_4op;
294
295 int voice;
296 struct snd_opl3_voice *vp, *vp2;
297 unsigned short connect_mask;
298 unsigned char connection;
299 unsigned char vol_op[4];
300
301 int extra_prg = 0;
302
303 unsigned short reg_side;
304 unsigned char op_offset;
305 unsigned char voice_offset;
306 unsigned short opl3_reg;
307 unsigned char reg_val;
308 unsigned char prg, bank;
309
310 int key = note;
311 unsigned char fnum, blocknum;
312 int i;
313
314 struct fm_patch *patch;
315 struct fm_instrument *fm;
316 unsigned long flags;
317
318 opl3 = p;
319
320 #ifdef DEBUG_MIDI
321 snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
322 chan->number, chan->midi_program, note, vel);
323 #endif
324
325 /* in SYNTH mode, application takes care of voices */
326 /* in SEQ mode, drum voice numbers are notes on drum channel */
327 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
328 if (chan->drum_channel) {
329 /* percussion instruments are located in bank 128 */
330 bank = 128;
331 prg = note;
332 } else {
333 bank = chan->gm_bank_select;
334 prg = chan->midi_program;
335 }
336 } else {
337 /* Prepare for OSS mode */
338 if (chan->number >= MAX_OPL3_VOICES)
339 return;
340
341 /* OSS instruments are located in bank 127 */
342 bank = 127;
343 prg = chan->midi_program;
344 }
345
346 spin_lock_irqsave(&opl3->voice_lock, flags);
347
348 if (use_internal_drums) {
349 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
350 spin_unlock_irqrestore(&opl3->voice_lock, flags);
351 return;
352 }
353
354 __extra_prg:
355 patch = snd_opl3_find_patch(opl3, prg, bank, 0);
356 if (!patch) {
357 spin_unlock_irqrestore(&opl3->voice_lock, flags);
358 return;
359 }
360
361 fm = &patch->inst;
362 switch (patch->type) {
363 case FM_PATCH_OPL2:
364 instr_4op = 0;
365 break;
366 case FM_PATCH_OPL3:
367 if (opl3->hardware >= OPL3_HW_OPL3) {
368 instr_4op = 1;
369 break;
370 }
371 /* fall through */
372 default:
373 spin_unlock_irqrestore(&opl3->voice_lock, flags);
374 return;
375 }
376 #ifdef DEBUG_MIDI
377 snd_printk(KERN_DEBUG " --> OPL%i instrument: %s\n",
378 instr_4op ? 3 : 2, patch->name);
379 #endif
380 /* in SYNTH mode, application takes care of voices */
381 /* in SEQ mode, allocate voice on free OPL3 channel */
382 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
383 voice = opl3_get_voice(opl3, instr_4op, chan);
384 } else {
385 /* remap OSS voice */
386 voice = snd_opl3_oss_map[chan->number];
387 }
388
389 if (voice < 0) {
390 spin_unlock_irqrestore(&opl3->voice_lock, flags);
391 return;
392 }
393
394 if (voice < MAX_OPL2_VOICES) {
395 /* Left register block for voices 0 .. 8 */
396 reg_side = OPL3_LEFT;
397 voice_offset = voice;
398 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
399 } else {
400 /* Right register block for voices 9 .. 17 */
401 reg_side = OPL3_RIGHT;
402 voice_offset = voice - MAX_OPL2_VOICES;
403 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
404 }
405
406 /* kill voice on channel */
407 vp = &opl3->voices[voice];
408 if (vp->state > 0) {
409 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
410 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
411 opl3->command(opl3, opl3_reg, reg_val);
412 }
413 if (instr_4op) {
414 vp2 = &opl3->voices[voice + 3];
415 if (vp->state > 0) {
416 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
417 voice_offset + 3);
418 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
419 opl3->command(opl3, opl3_reg, reg_val);
420 }
421 }
422
423 /* set connection register */
424 if (instr_4op) {
425 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
426 opl3->connection_reg |= connect_mask;
427 /* set connection bit */
428 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
429 opl3->command(opl3, opl3_reg, opl3->connection_reg);
430 }
431 } else {
432 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
433 opl3->connection_reg &= ~connect_mask;
434 /* clear connection bit */
435 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
436 opl3->command(opl3, opl3_reg, opl3->connection_reg);
437 }
438 }
439
440 #ifdef DEBUG_MIDI
441 snd_printk(KERN_DEBUG " --> setting OPL3 connection: 0x%x\n",
442 opl3->connection_reg);
443 #endif
444 /*
445 * calculate volume depending on connection
446 * between FM operators (see include/opl3.h)
447 */
448 for (i = 0; i < (instr_4op ? 4 : 2); i++)
449 vol_op[i] = fm->op[i].ksl_level;
450
451 connection = fm->feedback_connection[0] & 0x01;
452 if (instr_4op) {
453 connection <<= 1;
454 connection |= fm->feedback_connection[1] & 0x01;
455
456 snd_opl3_calc_volume(&vol_op[3], vel, chan);
457 switch (connection) {
458 case 0x03:
459 snd_opl3_calc_volume(&vol_op[2], vel, chan);
460 /* fallthru */
461 case 0x02:
462 snd_opl3_calc_volume(&vol_op[0], vel, chan);
463 break;
464 case 0x01:
465 snd_opl3_calc_volume(&vol_op[1], vel, chan);
466 }
467 } else {
468 snd_opl3_calc_volume(&vol_op[1], vel, chan);
469 if (connection)
470 snd_opl3_calc_volume(&vol_op[0], vel, chan);
471 }
472
473 /* Program the FM voice characteristics */
474 for (i = 0; i < (instr_4op ? 4 : 2); i++) {
475 #ifdef DEBUG_MIDI
476 snd_printk(KERN_DEBUG " --> programming operator %i\n", i);
477 #endif
478 op_offset = snd_opl3_regmap[voice_offset][i];
479
480 /* Set OPL3 AM_VIB register of requested voice/operator */
481 reg_val = fm->op[i].am_vib;
482 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
483 opl3->command(opl3, opl3_reg, reg_val);
484
485 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
486 reg_val = vol_op[i];
487 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
488 opl3->command(opl3, opl3_reg, reg_val);
489
490 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
491 reg_val = fm->op[i].attack_decay;
492 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
493 opl3->command(opl3, opl3_reg, reg_val);
494
495 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
496 reg_val = fm->op[i].sustain_release;
497 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
498 opl3->command(opl3, opl3_reg, reg_val);
499
500 /* Select waveform */
501 reg_val = fm->op[i].wave_select;
502 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
503 opl3->command(opl3, opl3_reg, reg_val);
504 }
505
506 /* Set operator feedback and 2op inter-operator connection */
507 reg_val = fm->feedback_connection[0];
508 /* Set output voice connection */
509 reg_val |= OPL3_STEREO_BITS;
510 if (chan->gm_pan < 43)
511 reg_val &= ~OPL3_VOICE_TO_RIGHT;
512 if (chan->gm_pan > 85)
513 reg_val &= ~OPL3_VOICE_TO_LEFT;
514 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
515 opl3->command(opl3, opl3_reg, reg_val);
516
517 if (instr_4op) {
518 /* Set 4op inter-operator connection */
519 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
520 /* Set output voice connection */
521 reg_val |= OPL3_STEREO_BITS;
522 if (chan->gm_pan < 43)
523 reg_val &= ~OPL3_VOICE_TO_RIGHT;
524 if (chan->gm_pan > 85)
525 reg_val &= ~OPL3_VOICE_TO_LEFT;
526 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
527 voice_offset + 3);
528 opl3->command(opl3, opl3_reg, reg_val);
529 }
530
531 /*
532 * Special treatment of percussion notes for fm:
533 * Requested pitch is really program, and pitch for
534 * device is whatever was specified in the patch library.
535 */
536 if (fm->fix_key)
537 note = fm->fix_key;
538 /*
539 * use transpose if defined in patch library
540 */
541 if (fm->trnsps)
542 note += (fm->trnsps - 64);
543
544 snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
545
546 /* Set OPL3 FNUM_LOW register of requested voice */
547 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
548 opl3->command(opl3, opl3_reg, fnum);
549
550 opl3->voices[voice].keyon_reg = blocknum;
551
552 /* Set output sound flag */
553 blocknum |= OPL3_KEYON_BIT;
554
555 #ifdef DEBUG_MIDI
556 snd_printk(KERN_DEBUG " --> trigger voice %i\n", voice);
557 #endif
558 /* Set OPL3 KEYON_BLOCK register of requested voice */
559 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
560 opl3->command(opl3, opl3_reg, blocknum);
561
562 /* kill note after fixed duration (in centiseconds) */
563 if (fm->fix_dur) {
564 opl3->voices[voice].note_off = jiffies +
565 (fm->fix_dur * HZ) / 100;
566 snd_opl3_start_timer(opl3);
567 opl3->voices[voice].note_off_check = 1;
568 } else
569 opl3->voices[voice].note_off_check = 0;
570
571 /* get extra pgm, but avoid possible loops */
572 extra_prg = (extra_prg) ? 0 : fm->modes;
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 bank = 128;
605 /* percussions start at 35 */
606 prg = extra_prg - 128 + 35 - 1;
607 } else {
608 bank = 0;
609 prg = extra_prg - 1;
610 }
611 #ifdef DEBUG_MIDI
612 snd_printk(KERN_DEBUG " *** allocating extra program\n");
613 #endif
614 goto __extra_prg;
615 }
616 spin_unlock_irqrestore(&opl3->voice_lock, flags);
617 }
618
snd_opl3_kill_voice(struct snd_opl3 * opl3,int voice)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 if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
628 return;
629
630 vp = &opl3->voices[voice];
631 if (voice < MAX_OPL2_VOICES) {
632 /* Left register block for voices 0 .. 8 */
633 reg_side = OPL3_LEFT;
634 voice_offset = voice;
635 } else {
636 /* Right register block for voices 9 .. 17 */
637 reg_side = OPL3_RIGHT;
638 voice_offset = voice - MAX_OPL2_VOICES;
639 }
640
641 /* kill voice */
642 #ifdef DEBUG_MIDI
643 snd_printk(KERN_DEBUG " --> kill voice %i\n", voice);
644 #endif
645 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
646 /* clear Key ON bit */
647 opl3->command(opl3, opl3_reg, vp->keyon_reg);
648
649 /* do the bookkeeping */
650 vp->time = opl3->use_time++;
651
652 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
653 vp2 = &opl3->voices[voice + 3];
654
655 vp2->time = opl3->use_time++;
656 vp2->state = SNDRV_OPL3_ST_OFF;
657 }
658 vp->state = SNDRV_OPL3_ST_OFF;
659 #ifdef DEBUG_ALLOC
660 debug_alloc(opl3, "note off", voice);
661 #endif
662
663 }
664
665 /*
666 * Release a note in response to a midi note off.
667 */
snd_opl3_note_off_unsafe(void * p,int note,int vel,struct snd_midi_channel * chan)668 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
669 struct snd_midi_channel *chan)
670 {
671 struct snd_opl3 *opl3;
672
673 int voice;
674 struct snd_opl3_voice *vp;
675
676 opl3 = p;
677
678 #ifdef DEBUG_MIDI
679 snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
680 chan->number, chan->midi_program, note);
681 #endif
682
683 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
684 if (chan->drum_channel && use_internal_drums) {
685 snd_opl3_drum_switch(opl3, note, vel, 0, chan);
686 return;
687 }
688 /* this loop will hopefully kill all extra voices, because
689 they are grouped by the same channel and note values */
690 for (voice = 0; voice < opl3->max_voices; voice++) {
691 vp = &opl3->voices[voice];
692 if (vp->state > 0 && vp->chan == chan && vp->note == note) {
693 snd_opl3_kill_voice(opl3, voice);
694 }
695 }
696 } else {
697 /* remap OSS voices */
698 if (chan->number < MAX_OPL3_VOICES) {
699 voice = snd_opl3_oss_map[chan->number];
700 snd_opl3_kill_voice(opl3, voice);
701 }
702 }
703 }
704
snd_opl3_note_off(void * p,int note,int vel,struct snd_midi_channel * chan)705 void snd_opl3_note_off(void *p, int note, int vel,
706 struct snd_midi_channel *chan)
707 {
708 struct snd_opl3 *opl3 = p;
709 unsigned long flags;
710
711 spin_lock_irqsave(&opl3->voice_lock, flags);
712 snd_opl3_note_off_unsafe(p, note, vel, chan);
713 spin_unlock_irqrestore(&opl3->voice_lock, flags);
714 }
715
716 /*
717 * key pressure change
718 */
snd_opl3_key_press(void * p,int note,int vel,struct snd_midi_channel * chan)719 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
720 {
721 #ifdef DEBUG_MIDI
722 snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
723 chan->number, chan->midi_program);
724 #endif
725 }
726
727 /*
728 * terminate note
729 */
snd_opl3_terminate_note(void * p,int note,struct snd_midi_channel * chan)730 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
731 {
732 #ifdef DEBUG_MIDI
733 snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
734 chan->number, chan->midi_program);
735 #endif
736 }
737
snd_opl3_update_pitch(struct snd_opl3 * opl3,int voice)738 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
739 {
740 unsigned short reg_side;
741 unsigned char voice_offset;
742 unsigned short opl3_reg;
743
744 unsigned char fnum, blocknum;
745
746 struct snd_opl3_voice *vp;
747
748 if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
749 return;
750
751 vp = &opl3->voices[voice];
752 if (vp->chan == NULL)
753 return; /* not allocated? */
754
755 if (voice < MAX_OPL2_VOICES) {
756 /* Left register block for voices 0 .. 8 */
757 reg_side = OPL3_LEFT;
758 voice_offset = voice;
759 } else {
760 /* Right register block for voices 9 .. 17 */
761 reg_side = OPL3_RIGHT;
762 voice_offset = voice - MAX_OPL2_VOICES;
763 }
764
765 snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
766
767 /* Set OPL3 FNUM_LOW register of requested voice */
768 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
769 opl3->command(opl3, opl3_reg, fnum);
770
771 vp->keyon_reg = blocknum;
772
773 /* Set output sound flag */
774 blocknum |= OPL3_KEYON_BIT;
775
776 /* Set OPL3 KEYON_BLOCK register of requested voice */
777 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
778 opl3->command(opl3, opl3_reg, blocknum);
779
780 vp->time = opl3->use_time++;
781 }
782
783 /*
784 * Update voice pitch controller
785 */
snd_opl3_pitch_ctrl(struct snd_opl3 * opl3,struct snd_midi_channel * chan)786 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
787 {
788 int voice;
789 struct snd_opl3_voice *vp;
790
791 unsigned long flags;
792
793 spin_lock_irqsave(&opl3->voice_lock, flags);
794
795 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
796 for (voice = 0; voice < opl3->max_voices; voice++) {
797 vp = &opl3->voices[voice];
798 if (vp->state > 0 && vp->chan == chan) {
799 snd_opl3_update_pitch(opl3, voice);
800 }
801 }
802 } else {
803 /* remap OSS voices */
804 if (chan->number < MAX_OPL3_VOICES) {
805 voice = snd_opl3_oss_map[chan->number];
806 snd_opl3_update_pitch(opl3, voice);
807 }
808 }
809 spin_unlock_irqrestore(&opl3->voice_lock, flags);
810 }
811
812 /*
813 * Deal with a controller type event. This includes all types of
814 * control events, not just the midi controllers
815 */
snd_opl3_control(void * p,int type,struct snd_midi_channel * chan)816 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
817 {
818 struct snd_opl3 *opl3;
819
820 opl3 = p;
821 #ifdef DEBUG_MIDI
822 snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
823 type, chan->number, chan->midi_program);
824 #endif
825
826 switch (type) {
827 case MIDI_CTL_MSB_MODWHEEL:
828 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
829 opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
830 else
831 opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
832 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
833 opl3->drum_reg);
834 break;
835 case MIDI_CTL_E2_TREMOLO_DEPTH:
836 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
837 opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
838 else
839 opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
840 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
841 opl3->drum_reg);
842 break;
843 case MIDI_CTL_PITCHBEND:
844 snd_opl3_pitch_ctrl(opl3, chan);
845 break;
846 }
847 }
848
849 /*
850 * NRPN events
851 */
snd_opl3_nrpn(void * p,struct snd_midi_channel * chan,struct snd_midi_channel_set * chset)852 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
853 struct snd_midi_channel_set *chset)
854 {
855 #ifdef DEBUG_MIDI
856 snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
857 chan->number, chan->midi_program);
858 #endif
859 }
860
861 /*
862 * receive sysex
863 */
snd_opl3_sysex(void * p,unsigned char * buf,int len,int parsed,struct snd_midi_channel_set * chset)864 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
865 int parsed, struct snd_midi_channel_set *chset)
866 {
867 #ifdef DEBUG_MIDI
868 snd_printk(KERN_DEBUG "SYSEX\n");
869 #endif
870 }
871
