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TOMOYO Linux Cross Reference
Linux/sound/drivers/opl3/opl3_midi.c

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  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 bool 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 
 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 
 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
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  */
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  */
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  */
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  */
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 
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  */
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 
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  */
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  */
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 
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  */
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  */
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  */
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  */
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 

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