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 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
33 struct snd_midi_channel *chan);
34 /*
35 * The next table looks magical, but it certainly is not. Its values have
36 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
37 * for i=0. This log-table converts a linear volume-scaling (0..127) to a
38 * logarithmic scaling as present in the FM-synthesizer chips. so : Volume
39 * 64 = 0 db = relative volume 0 and: Volume 32 = -6 db = relative
40 * volume -8 it was implemented as a table because it is only 128 bytes and
41 * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
42 */
43
44 static char opl3_volume_table[128] =
45 {
46 -63, -48, -40, -35, -32, -29, -27, -26,
47 -24, -23, -21, -20, -19, -18, -18, -17,
48 -16, -15, -15, -14, -13, -13, -12, -12,
49 -11, -11, -10, -10, -10, -9, -9, -8,
50 -8, -8, -7, -7, -7, -6, -6, -6,
51 -5, -5, -5, -5, -4, -4, -4, -4,
52 -3, -3, -3, -3, -2, -2, -2, -2,
53 -2, -1, -1, -1, -1, 0, 0, 0,
54 0, 0, 0, 1, 1, 1, 1, 1,
55 1, 2, 2, 2, 2, 2, 2, 2,
56 3, 3, 3, 3, 3, 3, 3, 4,
57 4, 4, 4, 4, 4, 4, 4, 5,
58 5, 5, 5, 5, 5, 5, 5, 5,
59 6, 6, 6, 6, 6, 6, 6, 6,
60 6, 7, 7, 7, 7, 7, 7, 7,
61 7, 7, 7, 8, 8, 8, 8, 8
62 };
63
snd_opl3_calc_volume(unsigned char * volbyte,int vel,struct snd_midi_channel * chan)64 void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
65 struct snd_midi_channel *chan)
66 {
67 int oldvol, newvol, n;
68 int volume;
69
70 volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
71 if (volume > 127)
72 volume = 127;
73
74 oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);
75
76 newvol = opl3_volume_table[volume] + oldvol;
77 if (newvol > OPL3_TOTAL_LEVEL_MASK)
78 newvol = OPL3_TOTAL_LEVEL_MASK;
79 else if (newvol < 0)
80 newvol = 0;
81
82 n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);
83
84 *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
85 }
86
87 /*
88 * Converts the note frequency to block and fnum values for the FM chip
89 */
90 static short opl3_note_table[16] =
91 {
92 305, 323, /* for pitch bending, -2 semitones */
93 343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
94 686, 726 /* for pitch bending, +2 semitones */
95 };
96
snd_opl3_calc_pitch(unsigned char * fnum,unsigned char * blocknum,int note,struct snd_midi_channel * chan)97 static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
98 int note, struct snd_midi_channel *chan)
99 {
100 int block = ((note / 12) & 0x07) - 1;
101 int idx = (note % 12) + 2;
102 int freq;
103
104 if (chan->midi_pitchbend) {
105 int pitchbend = chan->midi_pitchbend;
106 int segment;
107
108 if (pitchbend > 0x1FFF)
109 pitchbend = 0x1FFF;
110
111 segment = pitchbend / 0x1000;
112 freq = opl3_note_table[idx+segment];
113 freq += ((opl3_note_table[idx+segment+1] - freq) *
114 (pitchbend % 0x1000)) / 0x1000;
115 } else {
116 freq = opl3_note_table[idx];
117 }
118
119 *fnum = (unsigned char) freq;
120 *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
121 ((block << 2) & OPL3_BLOCKNUM_MASK);
122 }
123
124
125 #ifdef DEBUG_ALLOC
debug_alloc(struct snd_opl3 * opl3,char * s,int voice)126 static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
127 int i;
128 char *str = "x.24";
129
130 printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
131 for (i = 0; i < opl3->max_voices; i++)
132 printk("%c", *(str + opl3->voices[i].state + 1));
133 printk("\n");
134 }
135 #endif
136
137 /*
138 * Get a FM voice (channel) to play a note on.
139 */
opl3_get_voice(struct snd_opl3 * opl3,int instr_4op,struct snd_midi_channel * chan)140 static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
141 struct snd_midi_channel *chan) {
142 int chan_4op_1; /* first voice for 4op instrument */
143 int chan_4op_2; /* second voice for 4op instrument */
144
145 struct snd_opl3_voice *vp, *vp2;
146 unsigned int voice_time;
147 int i;
148
149 #ifdef DEBUG_ALLOC
150 char *alloc_type[3] = { "FREE ", "CHEAP ", "EXPENSIVE" };
151 #endif
152
153 /* This is our "allocation cost" table */
154 enum {
155 FREE = 0, CHEAP, EXPENSIVE, END
156 };
157
158 /* Keeps track of what we are finding */
159 struct best {
160 unsigned int time;
161 int voice;
162 } best[END];
163 struct best *bp;
164
165 for (i = 0; i < END; i++) {
166 best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */;
167 best[i].voice = -1;
168 }
169
170 /* Look through all the channels for the most suitable. */
171 for (i = 0; i < opl3->max_voices; i++) {
172 vp = &opl3->voices[i];
173
174 if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
175 /* skip unavailable channels, allocated by
176 drum voices or by bounded 4op voices) */
177 continue;
178
179 voice_time = vp->time;
180 bp = best;
181
182 chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
183 chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
184 if (instr_4op) {
185 /* allocate 4op voice */
186 /* skip channels unavailable to 4op instrument */
187 if (!chan_4op_1)
188 continue;
189
190 if (vp->state)
191 /* kill one voice, CHEAP */
192 bp++;
193 /* get state of bounded 2op channel
194 to be allocated for 4op instrument */
195 vp2 = &opl3->voices[i + 3];
196 if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
197 /* kill two voices, EXPENSIVE */
198 bp++;
199 voice_time = (voice_time > vp->time) ?
200 voice_time : vp->time;
201 }
202 } else {
203 /* allocate 2op voice */
204 if ((chan_4op_1) || (chan_4op_2))
205 /* use bounded channels for 2op, CHEAP */
206 bp++;
207 else if (vp->state)
208 /* kill one voice on 2op channel, CHEAP */
209 bp++;
210 /* raise kill cost to EXPENSIVE for all channels */
211 if (vp->state)
212 bp++;
213 }
214 if (voice_time < bp->time) {
215 bp->time = voice_time;
216 bp->voice = i;
217 }
218 }
219
220 for (i = 0; i < END; i++) {
221 if (best[i].voice >= 0) {
222 #ifdef DEBUG_ALLOC
223 printk(KERN_DEBUG "%s %iop allocation on voice %i\n",
224 alloc_type[i], instr_4op ? 4 : 2,
225 best[i].voice);
226 #endif
227 return best[i].voice;
228 }
229 }
230 /* not found */
231 return -1;
232 }
233
234 /* ------------------------------ */
235
236 /*
237 * System timer interrupt function
238 */
snd_opl3_timer_func(unsigned long data)239 void snd_opl3_timer_func(unsigned long data)
240 {
241
242 struct snd_opl3 *opl3 = (struct snd_opl3 *)data;
243 unsigned long flags;
244 int again = 0;
245 int i;
246
247 spin_lock_irqsave(&opl3->voice_lock, flags);
248 for (i = 0; i < opl3->max_voices; i++) {
249 struct snd_opl3_voice *vp = &opl3->voices[i];
250 if (vp->state > 0 && vp->note_off_check) {
251 if (vp->note_off == jiffies)
252 snd_opl3_note_off_unsafe(opl3, vp->note, 0,
253 vp->chan);
254 else
255 again++;
256 }
257 }
258 spin_unlock_irqrestore(&opl3->voice_lock, flags);
259
260 spin_lock_irqsave(&opl3->sys_timer_lock, flags);
261 if (again) {
262 opl3->tlist.expires = jiffies + 1; /* invoke again */
263 add_timer(&opl3->tlist);
264 } else {
265 opl3->sys_timer_status = 0;
266 }
267 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
268 }
269
270 /*
271 * Start system timer
272 */
snd_opl3_start_timer(struct snd_opl3 * opl3)273 static void snd_opl3_start_timer(struct snd_opl3 *opl3)
274 {
275 unsigned long flags;
276 spin_lock_irqsave(&opl3->sys_timer_lock, flags);
277 if (! opl3->sys_timer_status) {
278 opl3->tlist.expires = jiffies + 1;
279 add_timer(&opl3->tlist);
280 opl3->sys_timer_status = 1;
281 }
282 spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
283 }
284
285 /* ------------------------------ */
286
287
288 static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
289 0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
290 };
291
292 /*
293 * Start a note.
294 */
snd_opl3_note_on(void * p,int note,int vel,struct snd_midi_channel * chan)295 void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
296 {
297 struct snd_opl3 *opl3;
298 int instr_4op;
299
300 int voice;
301 struct snd_opl3_voice *vp, *vp2;
302 unsigned short connect_mask;
303 unsigned char connection;
304 unsigned char vol_op[4];
305
306 int extra_prg = 0;
307
308 unsigned short reg_side;
309 unsigned char op_offset;
310 unsigned char voice_offset;
311 unsigned short opl3_reg;
312 unsigned char reg_val;
313 unsigned char prg, bank;
314
315 int key = note;
316 unsigned char fnum, blocknum;
317 int i;
318
319 struct fm_patch *patch;
320 struct fm_instrument *fm;
321 unsigned long flags;
322
323 opl3 = p;
324
325 #ifdef DEBUG_MIDI
326 snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
327 chan->number, chan->midi_program, note, vel);
328 #endif
329
330 /* in SYNTH mode, application takes care of voices */
331 /* in SEQ mode, drum voice numbers are notes on drum channel */
332 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
333 if (chan->drum_channel) {
334 /* percussion instruments are located in bank 128 */
335 bank = 128;
336 prg = note;
337 } else {
338 bank = chan->gm_bank_select;
339 prg = chan->midi_program;
340 }
341 } else {
342 /* Prepare for OSS mode */
343 if (chan->number >= MAX_OPL3_VOICES)
344 return;
345
346 /* OSS instruments are located in bank 127 */
347 bank = 127;
348 prg = chan->midi_program;
349 }
350
351 spin_lock_irqsave(&opl3->voice_lock, flags);
352
353 if (use_internal_drums) {
354 snd_opl3_drum_switch(opl3, note, vel, 1, chan);
355 spin_unlock_irqrestore(&opl3->voice_lock, flags);
356 return;
357 }
358
359 __extra_prg:
360 patch = snd_opl3_find_patch(opl3, prg, bank, 0);
361 if (!patch) {
362 spin_unlock_irqrestore(&opl3->voice_lock, flags);
363 return;
364 }
365
366 fm = &patch->inst;
367 switch (patch->type) {
368 case FM_PATCH_OPL2:
369 instr_4op = 0;
370 break;
371 case FM_PATCH_OPL3:
372 if (opl3->hardware >= OPL3_HW_OPL3) {
373 instr_4op = 1;
374 break;
375 }
376 default:
377 spin_unlock_irqrestore(&opl3->voice_lock, flags);
378 return;
379 }
380 #ifdef DEBUG_MIDI
381 snd_printk(KERN_DEBUG " --> OPL%i instrument: %s\n",
382 instr_4op ? 3 : 2, patch->name);
383 #endif
384 /* in SYNTH mode, application takes care of voices */
385 /* in SEQ mode, allocate voice on free OPL3 channel */
386 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
387 voice = opl3_get_voice(opl3, instr_4op, chan);
388 } else {
389 /* remap OSS voice */
390 voice = snd_opl3_oss_map[chan->number];
391 }
392
393 if (voice < MAX_OPL2_VOICES) {
394 /* Left register block for voices 0 .. 8 */
395 reg_side = OPL3_LEFT;
396 voice_offset = voice;
397 connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
398 } else {
399 /* Right register block for voices 9 .. 17 */
400 reg_side = OPL3_RIGHT;
401 voice_offset = voice - MAX_OPL2_VOICES;
402 connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
403 }
404
405 /* kill voice on channel */
406 vp = &opl3->voices[voice];
407 if (vp->state > 0) {
408 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
409 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
410 opl3->command(opl3, opl3_reg, reg_val);
411 }
412 if (instr_4op) {
413 vp2 = &opl3->voices[voice + 3];
414 if (vp->state > 0) {
415 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
416 voice_offset + 3);
417 reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
418 opl3->command(opl3, opl3_reg, reg_val);
419 }
420 }
421
422 /* set connection register */
423 if (instr_4op) {
424 if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
425 opl3->connection_reg |= connect_mask;
426 /* set connection bit */
427 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
428 opl3->command(opl3, opl3_reg, opl3->connection_reg);
429 }
430 } else {
431 if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
432 opl3->connection_reg &= ~connect_mask;
433 /* clear connection bit */
434 opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
435 opl3->command(opl3, opl3_reg, opl3->connection_reg);
436 }
437 }
438
439 #ifdef DEBUG_MIDI
440 snd_printk(KERN_DEBUG " --> setting OPL3 connection: 0x%x\n",
441 opl3->connection_reg);
442 #endif
443 /*
444 * calculate volume depending on connection
445 * between FM operators (see include/opl3.h)
446 */
447 for (i = 0; i < (instr_4op ? 4 : 2); i++)
448 vol_op[i] = fm->op[i].ksl_level;
449
450 connection = fm->feedback_connection[0] & 0x01;
451 if (instr_4op) {
452 connection <<= 1;
453 connection |= fm->feedback_connection[1] & 0x01;
454
455 snd_opl3_calc_volume(&vol_op[3], vel, chan);
456 switch (connection) {
457 case 0x03:
458 snd_opl3_calc_volume(&vol_op[2], vel, chan);
459 /* fallthru */
460 case 0x02:
461 snd_opl3_calc_volume(&vol_op[0], vel, chan);
462 break;
463 case 0x01:
464 snd_opl3_calc_volume(&vol_op[1], vel, chan);
465 }
466 } else {
467 snd_opl3_calc_volume(&vol_op[1], vel, chan);
468 if (connection)
469 snd_opl3_calc_volume(&vol_op[0], vel, chan);
470 }
471
472 /* Program the FM voice characteristics */
473 for (i = 0; i < (instr_4op ? 4 : 2); i++) {
474 #ifdef DEBUG_MIDI
475 snd_printk(KERN_DEBUG " --> programming operator %i\n", i);
476 #endif
477 op_offset = snd_opl3_regmap[voice_offset][i];
478
479 /* Set OPL3 AM_VIB register of requested voice/operator */
480 reg_val = fm->op[i].am_vib;
481 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
482 opl3->command(opl3, opl3_reg, reg_val);
483
484 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
485 reg_val = vol_op[i];
486 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
487 opl3->command(opl3, opl3_reg, reg_val);
488
489 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
490 reg_val = fm->op[i].attack_decay;
491 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
492 opl3->command(opl3, opl3_reg, reg_val);
493
494 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
495 reg_val = fm->op[i].sustain_release;
496 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
497 opl3->command(opl3, opl3_reg, reg_val);
498
499 /* Select waveform */
500 reg_val = fm->op[i].wave_select;
501 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
502 opl3->command(opl3, opl3_reg, reg_val);
503 }
504
505 /* Set operator feedback and 2op inter-operator connection */
506 reg_val = fm->feedback_connection[0];
507 /* Set output voice connection */
508 reg_val |= OPL3_STEREO_BITS;
509 if (chan->gm_pan < 43)
510 reg_val &= ~OPL3_VOICE_TO_RIGHT;
511 if (chan->gm_pan > 85)
512 reg_val &= ~OPL3_VOICE_TO_LEFT;
513 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
514 opl3->command(opl3, opl3_reg, reg_val);
515
516 if (instr_4op) {
517 /* Set 4op inter-operator connection */
518 reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
519 /* Set output voice connection */
520 reg_val |= OPL3_STEREO_BITS;
521 if (chan->gm_pan < 43)
522 reg_val &= ~OPL3_VOICE_TO_RIGHT;
523 if (chan->gm_pan > 85)
524 reg_val &= ~OPL3_VOICE_TO_LEFT;
525 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
526 voice_offset + 3);
527 opl3->command(opl3, opl3_reg, reg_val);
528 }
529
530 /*
531 * Special treatment of percussion notes for fm:
532 * Requested pitch is really program, and pitch for
533 * device is whatever was specified in the patch library.
534 */
535 if (fm->fix_key)
536 note = fm->fix_key;
537 /*
538 * use transpose if defined in patch library
539 */
540 if (fm->trnsps)
541 note += (fm->trnsps - 64);
542
543 snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
544
545 /* Set OPL3 FNUM_LOW register of requested voice */
546 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
547 opl3->command(opl3, opl3_reg, fnum);
548
549 opl3->voices[voice].keyon_reg = blocknum;
550
551 /* Set output sound flag */
552 blocknum |= OPL3_KEYON_BIT;
553
554 #ifdef DEBUG_MIDI
555 snd_printk(KERN_DEBUG " --> trigger voice %i\n", voice);
556 #endif
557 /* Set OPL3 KEYON_BLOCK register of requested voice */
558 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
559 opl3->command(opl3, opl3_reg, blocknum);
560
561 /* kill note after fixed duration (in centiseconds) */
562 if (fm->fix_dur) {
563 opl3->voices[voice].note_off = jiffies +
564 (fm->fix_dur * HZ) / 100;
565 snd_opl3_start_timer(opl3);
566 opl3->voices[voice].note_off_check = 1;
567 } else
568 opl3->voices[voice].note_off_check = 0;
569
570 /* get extra pgm, but avoid possible loops */
571 extra_prg = (extra_prg) ? 0 : fm->modes;
572
573 /* do the bookkeeping */
574 vp->time = opl3->use_time++;
575 vp->note = key;
576 vp->chan = chan;
577
578 if (instr_4op) {
579 vp->state = SNDRV_OPL3_ST_ON_4OP;
580
581 vp2 = &opl3->voices[voice + 3];
582 vp2->time = opl3->use_time++;
583 vp2->note = key;
584 vp2->chan = chan;
585 vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
586 } else {
587 if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
588 /* 4op killed by 2op, release bounded voice */
589 vp2 = &opl3->voices[voice + 3];
590 vp2->time = opl3->use_time++;
591 vp2->state = SNDRV_OPL3_ST_OFF;
592 }
593 vp->state = SNDRV_OPL3_ST_ON_2OP;
594 }
595
596 #ifdef DEBUG_ALLOC
597 debug_alloc(opl3, "note on ", voice);
598 #endif
599
600 /* allocate extra program if specified in patch library */
601 if (extra_prg) {
602 if (extra_prg > 128) {
603 bank = 128;
604 /* percussions start at 35 */
605 prg = extra_prg - 128 + 35 - 1;
606 } else {
607 bank = 0;
608 prg = extra_prg - 1;
609 }
610 #ifdef DEBUG_MIDI
611 snd_printk(KERN_DEBUG " *** allocating extra program\n");
612 #endif
613 goto __extra_prg;
614 }
615 spin_unlock_irqrestore(&opl3->voice_lock, flags);
616 }
617
snd_opl3_kill_voice(struct snd_opl3 * opl3,int voice)618 static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
619 {
620 unsigned short reg_side;
621 unsigned char voice_offset;
622 unsigned short opl3_reg;
623
624 struct snd_opl3_voice *vp, *vp2;
625
626 if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
627 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(KERN_DEBUG " --> 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 */
snd_opl3_note_off_unsafe(void * p,int note,int vel,struct snd_midi_channel * chan)667 static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
668 struct snd_midi_channel *chan)
669 {
670 struct snd_opl3 *opl3;
671
672 int voice;
673 struct snd_opl3_voice *vp;
674
675 opl3 = p;
676
677 #ifdef DEBUG_MIDI
678 snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
679 chan->number, chan->midi_program, note);
680 #endif
681
682 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
683 if (chan->drum_channel && use_internal_drums) {
684 snd_opl3_drum_switch(opl3, note, vel, 0, chan);
685 return;
686 }
687 /* this loop will hopefully kill all extra voices, because
688 they are grouped by the same channel and note values */
689 for (voice = 0; voice < opl3->max_voices; voice++) {
690 vp = &opl3->voices[voice];
691 if (vp->state > 0 && vp->chan == chan && vp->note == note) {
692 snd_opl3_kill_voice(opl3, voice);
693 }
694 }
695 } else {
696 /* remap OSS voices */
697 if (chan->number < MAX_OPL3_VOICES) {
698 voice = snd_opl3_oss_map[chan->number];
699 snd_opl3_kill_voice(opl3, voice);
700 }
701 }
702 }
703
snd_opl3_note_off(void * p,int note,int vel,struct snd_midi_channel * chan)704 void snd_opl3_note_off(void *p, int note, int vel,
705 struct snd_midi_channel *chan)
706 {
707 struct snd_opl3 *opl3 = p;
708 unsigned long flags;
709
710 spin_lock_irqsave(&opl3->voice_lock, flags);
711 snd_opl3_note_off_unsafe(p, note, vel, chan);
712 spin_unlock_irqrestore(&opl3->voice_lock, flags);
713 }
714
715 /*
716 * key pressure change
717 */
snd_opl3_key_press(void * p,int note,int vel,struct snd_midi_channel * chan)718 void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
719 {
720 struct snd_opl3 *opl3;
721
722 opl3 = p;
723 #ifdef DEBUG_MIDI
724 snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
725 chan->number, chan->midi_program);
726 #endif
727 }
728
729 /*
730 * terminate note
731 */
snd_opl3_terminate_note(void * p,int note,struct snd_midi_channel * chan)732 void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
733 {
734 struct snd_opl3 *opl3;
735
736 opl3 = p;
737 #ifdef DEBUG_MIDI
738 snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
739 chan->number, chan->midi_program);
740 #endif
741 }
742
snd_opl3_update_pitch(struct snd_opl3 * opl3,int voice)743 static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
744 {
745 unsigned short reg_side;
746 unsigned char voice_offset;
747 unsigned short opl3_reg;
748
749 unsigned char fnum, blocknum;
750
751 struct snd_opl3_voice *vp;
752
753 if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
754 return;
755
756 vp = &opl3->voices[voice];
757 if (vp->chan == NULL)
758 return; /* not allocated? */
759
760 if (voice < MAX_OPL2_VOICES) {
761 /* Left register block for voices 0 .. 8 */
762 reg_side = OPL3_LEFT;
763 voice_offset = voice;
764 } else {
765 /* Right register block for voices 9 .. 17 */
766 reg_side = OPL3_RIGHT;
767 voice_offset = voice - MAX_OPL2_VOICES;
768 }
769
770 snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
771
772 /* Set OPL3 FNUM_LOW register of requested voice */
773 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
774 opl3->command(opl3, opl3_reg, fnum);
775
776 vp->keyon_reg = blocknum;
777
778 /* Set output sound flag */
779 blocknum |= OPL3_KEYON_BIT;
780
781 /* Set OPL3 KEYON_BLOCK register of requested voice */
782 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
783 opl3->command(opl3, opl3_reg, blocknum);
784
785 vp->time = opl3->use_time++;
786 }
787
788 /*
789 * Update voice pitch controller
790 */
snd_opl3_pitch_ctrl(struct snd_opl3 * opl3,struct snd_midi_channel * chan)791 static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
792 {
793 int voice;
794 struct snd_opl3_voice *vp;
795
796 unsigned long flags;
797
798 spin_lock_irqsave(&opl3->voice_lock, flags);
799
800 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
801 for (voice = 0; voice < opl3->max_voices; voice++) {
802 vp = &opl3->voices[voice];
803 if (vp->state > 0 && vp->chan == chan) {
804 snd_opl3_update_pitch(opl3, voice);
805 }
806 }
807 } else {
808 /* remap OSS voices */
809 if (chan->number < MAX_OPL3_VOICES) {
810 voice = snd_opl3_oss_map[chan->number];
811 snd_opl3_update_pitch(opl3, voice);
812 }
813 }
814 spin_unlock_irqrestore(&opl3->voice_lock, flags);
815 }
816
817 /*
818 * Deal with a controller type event. This includes all types of
819 * control events, not just the midi controllers
820 */
snd_opl3_control(void * p,int type,struct snd_midi_channel * chan)821 void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
822 {
823 struct snd_opl3 *opl3;
824
825 opl3 = p;
826 #ifdef DEBUG_MIDI
827 snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
828 type, chan->number, chan->midi_program);
829 #endif
830
831 switch (type) {
832 case MIDI_CTL_MSB_MODWHEEL:
833 if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
834 opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
835 else
836 opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
837 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
838 opl3->drum_reg);
839 break;
840 case MIDI_CTL_E2_TREMOLO_DEPTH:
841 if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
842 opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
843 else
844 opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
845 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
846 opl3->drum_reg);
847 break;
848 case MIDI_CTL_PITCHBEND:
849 snd_opl3_pitch_ctrl(opl3, chan);
850 break;
851 }
852 }
853
854 /*
855 * NRPN events
856 */
snd_opl3_nrpn(void * p,struct snd_midi_channel * chan,struct snd_midi_channel_set * chset)857 void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
858 struct snd_midi_channel_set *chset)
859 {
860 struct snd_opl3 *opl3;
861
862 opl3 = p;
863 #ifdef DEBUG_MIDI
864 snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
865 chan->number, chan->midi_program);
866 #endif
867 }
868
869 /*
870 * receive sysex
871 */
snd_opl3_sysex(void * p,unsigned char * buf,int len,int parsed,struct snd_midi_channel_set * chset)872 void snd_opl3_sysex(void *p, unsigned char *buf, int len,
873 int parsed, struct snd_midi_channel_set *chset)
874 {
875 struct snd_opl3 *opl3;
876
877 opl3 = p;
878 #ifdef DEBUG_MIDI
879 snd_printk(KERN_DEBUG "SYSEX\n");
880 #endif
881 }
882