aboutsummaryrefslogtreecommitdiff
path: root/sound/synth/emux/emux_synth.c
blob: 24705d15ebd80e89b58e9c7c66885e2729490f2c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
/*
 *  Midi synth routines for the Emu8k/Emu10k1
 *
 *  Copyright (C) 1999 Steve Ratcliffe
 *  Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
 *
 *  Contains code based on awe_wave.c by Takashi Iwai
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include "emux_voice.h"
#include <sound/asoundef.h>

/*
 * Prototypes
 */

/*
 * Ensure a value is between two points
 * macro evaluates its args more than once, so changed to upper-case.
 */
#define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
#define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)

static int get_zone(struct snd_emux *emu, struct snd_emux_port *port,
		    int *notep, int vel, struct snd_midi_channel *chan,
		    struct snd_sf_zone **table);
static int get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan);
static void terminate_note1(struct snd_emux *emu, int note,
			    struct snd_midi_channel *chan, int free);
static void exclusive_note_off(struct snd_emux *emu, struct snd_emux_port *port,
			       int exclass);
static void terminate_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int free);
static void update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update);
static void setup_voice(struct snd_emux_voice *vp);
static int calc_pan(struct snd_emux_voice *vp);
static int calc_volume(struct snd_emux_voice *vp);
static int calc_pitch(struct snd_emux_voice *vp);


/*
 * Start a note.
 */
void
snd_emux_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
{
	struct snd_emux *emu;
	int i, key, nvoices;
	struct snd_emux_voice *vp;
	struct snd_sf_zone *table[SNDRV_EMUX_MAX_MULTI_VOICES];
	unsigned long flags;
	struct snd_emux_port *port;

	port = p;
	snd_assert(port != NULL && chan != NULL, return);

	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.get_voice != NULL, return);
	snd_assert(emu->ops.trigger != NULL, return);

	key = note; /* remember the original note */
	nvoices = get_zone(emu, port, &note, vel, chan, table);
	if (! nvoices)
		return;

	/* exclusive note off */
	for (i = 0; i < nvoices; i++) {
		struct snd_sf_zone *zp = table[i];
		if (zp && zp->v.exclusiveClass)
			exclusive_note_off(emu, port, zp->v.exclusiveClass);
	}

#if 0 // seems not necessary
	/* Turn off the same note on the same channel. */
	terminate_note1(emu, key, chan, 0);
#endif

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < nvoices; i++) {

		/* set up each voice parameter */
		/* at this stage, we don't trigger the voice yet. */

		if (table[i] == NULL)
			continue;

		vp = emu->ops.get_voice(emu, port);
		if (vp == NULL || vp->ch < 0)
			continue;
		if (STATE_IS_PLAYING(vp->state))
			emu->ops.terminate(vp);

		vp->time = emu->use_time++;
		vp->chan = chan;
		vp->port = port;
		vp->key = key;
		vp->note = note;
		vp->velocity = vel;
		vp->zone = table[i];
		if (vp->zone->sample)
			vp->block = vp->zone->sample->block;
		else
			vp->block = NULL;

		setup_voice(vp);

		vp->state = SNDRV_EMUX_ST_STANDBY;
		if (emu->ops.prepare) {
			vp->state = SNDRV_EMUX_ST_OFF;
			if (emu->ops.prepare(vp) >= 0)
				vp->state = SNDRV_EMUX_ST_STANDBY;
		}
	}

	/* start envelope now */
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (vp->state == SNDRV_EMUX_ST_STANDBY &&
		    vp->chan == chan) {
			emu->ops.trigger(vp);
			vp->state = SNDRV_EMUX_ST_ON;
			vp->ontime = jiffies; /* remember the trigger timing */
		}
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	if (port->port_mode == SNDRV_EMUX_PORT_MODE_OSS_SYNTH) {
		/* clear voice position for the next note on this channel */
		struct snd_emux_effect_table *fx = chan->private;
		if (fx) {
			fx->flag[EMUX_FX_SAMPLE_START] = 0;
			fx->flag[EMUX_FX_COARSE_SAMPLE_START] = 0;
		}
	}
#endif
}

/*
 * Release a note in response to a midi note off.
 */
void
snd_emux_note_off(void *p, int note, int vel, struct snd_midi_channel *chan)
{
	int ch;
	struct snd_emux *emu;
	struct snd_emux_voice *vp;
	unsigned long flags;
	struct snd_emux_port *port;

	port = p;
	snd_assert(port != NULL && chan != NULL, return);

	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.release != NULL, return);

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (ch = 0; ch < emu->max_voices; ch++) {
		vp = &emu->voices[ch];
		if (STATE_IS_PLAYING(vp->state) &&
		    vp->chan == chan && vp->key == note) {
			vp->state = SNDRV_EMUX_ST_RELEASED;
			if (vp->ontime == jiffies) {
				/* if note-off is sent too shortly after
				 * note-on, emuX engine cannot produce the sound
				 * correctly.  so we'll release this note
				 * a bit later via timer callback.
				 */
				vp->state = SNDRV_EMUX_ST_PENDING;
				if (! emu->timer_active) {
					emu->tlist.expires = jiffies + 1;
					add_timer(&emu->tlist);
					emu->timer_active = 1;
				}
			} else
				/* ok now release the note */
				emu->ops.release(vp);
		}
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}

/*
 * timer callback
 *
 * release the pending note-offs
 */
void snd_emux_timer_callback(unsigned long data)
{
	struct snd_emux *emu = (struct snd_emux *) data;
	struct snd_emux_voice *vp;
	unsigned long flags;
	int ch, do_again = 0;

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (ch = 0; ch < emu->max_voices; ch++) {
		vp = &emu->voices[ch];
		if (vp->state == SNDRV_EMUX_ST_PENDING) {
			if (vp->ontime == jiffies)
				do_again++; /* release this at the next interrupt */
			else {
				emu->ops.release(vp);
				vp->state = SNDRV_EMUX_ST_RELEASED;
			}
		}
	}
	if (do_again) {
		emu->tlist.expires = jiffies + 1;
		add_timer(&emu->tlist);
		emu->timer_active = 1;
	} else
		emu->timer_active = 0;
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}

/*
 * key pressure change
 */
void
snd_emux_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
{
	int ch;
	struct snd_emux *emu;
	struct snd_emux_voice *vp;
	unsigned long flags;
	struct snd_emux_port *port;

	port = p;
	snd_assert(port != NULL && chan != NULL, return);

	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.update != NULL, return);

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (ch = 0; ch < emu->max_voices; ch++) {
		vp = &emu->voices[ch];
		if (vp->state == SNDRV_EMUX_ST_ON &&
		    vp->chan == chan && vp->key == note) {
			vp->velocity = vel;
			update_voice(emu, vp, SNDRV_EMUX_UPDATE_VOLUME);
		}
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}


/*
 * Modulate the voices which belong to the channel
 */
void
snd_emux_update_channel(struct snd_emux_port *port, struct snd_midi_channel *chan, int update)
{
	struct snd_emux *emu;
	struct snd_emux_voice *vp;
	int i;
	unsigned long flags;

	if (! update)
		return;

	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.update != NULL, return);

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (vp->chan == chan)
			update_voice(emu, vp, update);
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}

/*
 * Modulate all the voices which belong to the port.
 */
void
snd_emux_update_port(struct snd_emux_port *port, int update)
{
	struct snd_emux *emu; 
	struct snd_emux_voice *vp;
	int i;
	unsigned long flags;

	if (! update)
		return;

	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.update != NULL, return);

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (vp->port == port)
			update_voice(emu, vp, update);
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}


/*
 * Deal with a controler type event.  This includes all types of
 * control events, not just the midi controllers
 */
void
snd_emux_control(void *p, int type, struct snd_midi_channel *chan)
{
	struct snd_emux_port *port;

	port = p;
	snd_assert(port != NULL && chan != NULL, return);

	switch (type) {
	case MIDI_CTL_MSB_MAIN_VOLUME:
	case MIDI_CTL_MSB_EXPRESSION:
		snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_VOLUME);
		break;
		
	case MIDI_CTL_MSB_PAN:
		snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PAN);
		break;

	case MIDI_CTL_SOFT_PEDAL:
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
		/* FIXME: this is an emulation */
		snd_emux_send_effect(port, chan, EMUX_FX_CUTOFF, -160,
				     EMUX_FX_FLAG_ADD);
#endif
		break;

	case MIDI_CTL_PITCHBEND:
		snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PITCH);
		break;

	case MIDI_CTL_MSB_MODWHEEL:
	case MIDI_CTL_CHAN_PRESSURE:
		snd_emux_update_channel(port, chan,
					SNDRV_EMUX_UPDATE_FMMOD |
					SNDRV_EMUX_UPDATE_FM2FRQ2);
		break;

	}

	if (port->chset.midi_mode == SNDRV_MIDI_MODE_XG) {
		snd_emux_xg_control(port, chan, type);
	}
}


/*
 * terminate note - if free flag is true, free the terminated voice
 */
static void
terminate_note1(struct snd_emux *emu, int note, struct snd_midi_channel *chan, int free)
{
	int  i;
	struct snd_emux_voice *vp;
	unsigned long flags;

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (STATE_IS_PLAYING(vp->state) && vp->chan == chan &&
		    vp->key == note)
			terminate_voice(emu, vp, free);
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}


/*
 * terminate note - exported for midi emulation
 */
void
snd_emux_terminate_note(void *p, int note, struct snd_midi_channel *chan)
{
	struct snd_emux *emu;
	struct snd_emux_port *port;

	port = p;
	snd_assert(port != NULL && chan != NULL, return);

	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.terminate != NULL, return);

	terminate_note1(emu, note, chan, 1);
}


/*
 * Terminate all the notes
 */
void
snd_emux_terminate_all(struct snd_emux *emu)
{
	int i;
	struct snd_emux_voice *vp;
	unsigned long flags;

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (STATE_IS_PLAYING(vp->state))
			terminate_voice(emu, vp, 0);
		if (vp->state == SNDRV_EMUX_ST_OFF) {
			if (emu->ops.free_voice)
				emu->ops.free_voice(vp);
			if (emu->ops.reset)
				emu->ops.reset(emu, i);
		}
		vp->time = 0;
	}
	/* initialize allocation time */
	emu->use_time = 0;
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}


/*
 * Terminate all voices associated with the given port
 */
void
snd_emux_sounds_off_all(struct snd_emux_port *port)
{
	int i;
	struct snd_emux *emu;
	struct snd_emux_voice *vp;
	unsigned long flags;

	snd_assert(port != NULL, return);
	emu = port->emu;
	snd_assert(emu != NULL, return);
	snd_assert(emu->ops.terminate != NULL, return);

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (STATE_IS_PLAYING(vp->state) &&
		    vp->port == port)
			terminate_voice(emu, vp, 0);
		if (vp->state == SNDRV_EMUX_ST_OFF) {
			if (emu->ops.free_voice)
				emu->ops.free_voice(vp);
			if (emu->ops.reset)
				emu->ops.reset(emu, i);
		}
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}


/*
 * Terminate all voices that have the same exclusive class.  This
 * is mainly for drums.
 */
static void
exclusive_note_off(struct snd_emux *emu, struct snd_emux_port *port, int exclass)
{
	struct snd_emux_voice *vp;
	int  i;
	unsigned long flags;

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		if (STATE_IS_PLAYING(vp->state) && vp->port == port &&
		    vp->reg.exclusiveClass == exclass) {
			terminate_voice(emu, vp, 0);
		}
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}

/*
 * terminate a voice
 * if free flag is true, call free_voice after termination
 */
static void
terminate_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int free)
{
	emu->ops.terminate(vp);
	vp->time = emu->use_time++;
	vp->chan = NULL;
	vp->port = NULL;
	vp->zone = NULL;
	vp->block = NULL;
	vp->state = SNDRV_EMUX_ST_OFF;
	if (free && emu->ops.free_voice)
		emu->ops.free_voice(vp);
}


/*
 * Modulate the voice
 */
static void
update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update)
{
	if (!STATE_IS_PLAYING(vp->state))
		return;

	if (vp->chan == NULL || vp->port == NULL)
		return;
	if (update & SNDRV_EMUX_UPDATE_VOLUME)
		calc_volume(vp);
	if (update & SNDRV_EMUX_UPDATE_PITCH)
		calc_pitch(vp);
	if (update & SNDRV_EMUX_UPDATE_PAN) {
		if (! calc_pan(vp) && (update == SNDRV_EMUX_UPDATE_PAN))
			return;
	}
	emu->ops.update(vp, update);
}


#if 0 // not used
/* table for volume target calculation */
static unsigned short voltarget[16] = { 
	0xEAC0, 0xE0C8, 0xD740, 0xCE20, 0xC560, 0xBD08, 0xB500, 0xAD58,
	0xA5F8, 0x9EF0, 0x9830, 0x91C0, 0x8B90, 0x85A8, 0x8000, 0x7A90
};
#endif

#define LO_BYTE(v)	((v) & 0xff)
#define HI_BYTE(v)	(((v) >> 8) & 0xff)

/*
 * Sets up the voice structure by calculating some values that
 * will be needed later.
 */
static void
setup_voice(struct snd_emux_voice *vp)
{
	struct soundfont_voice_parm *parm;
	int pitch;

	/* copy the original register values */
	vp->reg = vp->zone->v;

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	snd_emux_setup_effect(vp);
#endif

	/* reset status */
	vp->apan = -1;
	vp->avol = -1;
	vp->apitch = -1;

	calc_volume(vp);
	calc_pitch(vp);
	calc_pan(vp);

	parm = &vp->reg.parm;

	/* compute filter target and correct modulation parameters */
	if (LO_BYTE(parm->modatkhld) >= 0x80 && parm->moddelay >= 0x8000) {
		parm->moddelay = 0xbfff;
		pitch = (HI_BYTE(parm->pefe) << 4) + vp->apitch;
		if (pitch > 0xffff)
			pitch = 0xffff;
		/* calculate filter target */
		vp->ftarget = parm->cutoff + LO_BYTE(parm->pefe);
		LIMITVALUE(vp->ftarget, 0, 255);
		vp->ftarget <<= 8;
	} else {
		vp->ftarget = parm->cutoff;
		vp->ftarget <<= 8;
		pitch = vp->apitch;
	}

	/* compute pitch target */
	if (pitch != 0xffff) {
		vp->ptarget = 1 << (pitch >> 12);
		if (pitch & 0x800) vp->ptarget += (vp->ptarget*0x102e)/0x2710;
		if (pitch & 0x400) vp->ptarget += (vp->ptarget*0x764)/0x2710;
		if (pitch & 0x200) vp->ptarget += (vp->ptarget*0x389)/0x2710;
		vp->ptarget += (vp->ptarget >> 1);
		if (vp->ptarget > 0xffff) vp->ptarget = 0xffff;
	} else
		vp->ptarget = 0xffff;

	if (LO_BYTE(parm->modatkhld) >= 0x80) {
		parm->modatkhld &= ~0xff;
		parm->modatkhld |= 0x7f;
	}

	/* compute volume target and correct volume parameters */
	vp->vtarget = 0;
#if 0 /* FIXME: this leads to some clicks.. */
	if (LO_BYTE(parm->volatkhld) >= 0x80 && parm->voldelay >= 0x8000) {
		parm->voldelay = 0xbfff;
		vp->vtarget = voltarget[vp->avol % 0x10] >> (vp->avol >> 4);
	}
#endif

	if (LO_BYTE(parm->volatkhld) >= 0x80) {
		parm->volatkhld &= ~0xff;
		parm->volatkhld |= 0x7f;
	}
}

/*
 * calculate pitch parameter
 */
static unsigned char pan_volumes[256] = {
0x00,0x03,0x06,0x09,0x0c,0x0f,0x12,0x14,0x17,0x1a,0x1d,0x20,0x22,0x25,0x28,0x2a,
0x2d,0x30,0x32,0x35,0x37,0x3a,0x3c,0x3f,0x41,0x44,0x46,0x49,0x4b,0x4d,0x50,0x52,
0x54,0x57,0x59,0x5b,0x5d,0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6f,0x71,0x73,0x75,
0x77,0x79,0x7b,0x7c,0x7e,0x80,0x82,0x84,0x86,0x88,0x89,0x8b,0x8d,0x8f,0x90,0x92,
0x94,0x96,0x97,0x99,0x9a,0x9c,0x9e,0x9f,0xa1,0xa2,0xa4,0xa5,0xa7,0xa8,0xaa,0xab,
0xad,0xae,0xaf,0xb1,0xb2,0xb3,0xb5,0xb6,0xb7,0xb9,0xba,0xbb,0xbc,0xbe,0xbf,0xc0,
0xc1,0xc2,0xc3,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,0xd0,0xd1,
0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdc,0xdd,0xde,0xdf,
0xdf,0xe0,0xe1,0xe2,0xe2,0xe3,0xe4,0xe4,0xe5,0xe6,0xe6,0xe7,0xe8,0xe8,0xe9,0xe9,
0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xee,0xee,0xef,0xef,0xf0,0xf0,0xf1,0xf1,0xf1,
0xf2,0xf2,0xf3,0xf3,0xf3,0xf4,0xf4,0xf5,0xf5,0xf5,0xf6,0xf6,0xf6,0xf7,0xf7,0xf7,
0xf7,0xf8,0xf8,0xf8,0xf9,0xf9,0xf9,0xf9,0xf9,0xfa,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb,
0xfb,0xfb,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,
0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
};

static int
calc_pan(struct snd_emux_voice *vp)
{
	struct snd_midi_channel *chan = vp->chan;
	int pan;

	/* pan & loop start (pan 8bit, MSB, 0:right, 0xff:left) */
	if (vp->reg.fixpan > 0)	/* 0-127 */
		pan = 255 - (int)vp->reg.fixpan * 2;
	else {
		pan = chan->control[MIDI_CTL_MSB_PAN] - 64;
		if (vp->reg.pan >= 0) /* 0-127 */
			pan += vp->reg.pan - 64;
		pan = 127 - (int)pan * 2;
	}
	LIMITVALUE(pan, 0, 255);

	if (vp->emu->linear_panning) {
		/* assuming linear volume */
		if (pan != vp->apan) {
			vp->apan = pan;
			if (pan == 0)
				vp->aaux = 0xff;
			else
				vp->aaux = (-pan) & 0xff;
			return 1;
		} else
			return 0;
	} else {
		/* using volume table */
		if (vp->apan != (int)pan_volumes[pan]) {
			vp->apan = pan_volumes[pan];
			vp->aaux = pan_volumes[255 - pan];
			return 1;
		}
		return 0;
	}
}


/*
 * calculate volume attenuation
 *
 * Voice volume is controlled by volume attenuation parameter.
 * So volume becomes maximum when avol is 0 (no attenuation), and
 * minimum when 255 (-96dB or silence).
 */

/* tables for volume->attenuation calculation */
static unsigned char voltab1[128] = {
   0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
   0x63, 0x2b, 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22,
   0x21, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1b, 0x1b, 0x1a,
   0x19, 0x19, 0x18, 0x17, 0x17, 0x16, 0x16, 0x15, 0x15, 0x14,
   0x14, 0x13, 0x13, 0x13, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10,
   0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e, 0x0e, 0x0e, 0x0d,
   0x0d, 0x0d, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b, 0x0b,
   0x0b, 0x0a, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, 0x09,
   0x08, 0x08, 0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x06,
   0x06, 0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x05, 0x04,
   0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x02,
   0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01,
   0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static unsigned char voltab2[128] = {
   0x32, 0x31, 0x30, 0x2f, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x2a,
   0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x24, 0x23, 0x22, 0x21,
   0x21, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1c, 0x1b, 0x1a,
   0x1a, 0x19, 0x19, 0x18, 0x18, 0x17, 0x16, 0x16, 0x15, 0x15,
   0x14, 0x14, 0x13, 0x13, 0x13, 0x12, 0x12, 0x11, 0x11, 0x10,
   0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e, 0x0e, 0x0d, 0x0d,
   0x0d, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b, 0x0b, 0x0b, 0x0a, 0x0a,
   0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, 0x09, 0x08, 0x08, 0x08,
   0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x07, 0x06, 0x06, 0x06,
   0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
   0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03,
   0x03, 0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01,
   0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
};

static unsigned char expressiontab[128] = {
   0x7f, 0x6c, 0x62, 0x5a, 0x54, 0x50, 0x4b, 0x48, 0x45, 0x42,
   0x40, 0x3d, 0x3b, 0x39, 0x38, 0x36, 0x34, 0x33, 0x31, 0x30,
   0x2f, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, 0x28, 0x27, 0x26, 0x25,
   0x24, 0x24, 0x23, 0x22, 0x21, 0x21, 0x20, 0x1f, 0x1e, 0x1e,
   0x1d, 0x1d, 0x1c, 0x1b, 0x1b, 0x1a, 0x1a, 0x19, 0x18, 0x18,
   0x17, 0x17, 0x16, 0x16, 0x15, 0x15, 0x15, 0x14, 0x14, 0x13,
   0x13, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10, 0x10, 0x0f, 0x0f,
   0x0f, 0x0e, 0x0e, 0x0e, 0x0d, 0x0d, 0x0d, 0x0c, 0x0c, 0x0c,
   0x0b, 0x0b, 0x0b, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09,
   0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x06, 0x06, 0x06,
   0x06, 0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03,
   0x03, 0x03, 0x03, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01,
   0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

/*
 * Magic to calculate the volume (actually attenuation) from all the
 * voice and channels parameters.
 */
static int
calc_volume(struct snd_emux_voice *vp)
{
	int vol;
	int main_vol, expression_vol, master_vol;
	struct snd_midi_channel *chan = vp->chan;
	struct snd_emux_port *port = vp->port;

	expression_vol = chan->control[MIDI_CTL_MSB_EXPRESSION];
	LIMITMAX(vp->velocity, 127);
	LIMITVALUE(expression_vol, 0, 127);
	if (port->port_mode == SNDRV_EMUX_PORT_MODE_OSS_SYNTH) {
		/* 0 - 127 */
		main_vol = chan->control[MIDI_CTL_MSB_MAIN_VOLUME];
		vol = (vp->velocity * main_vol * expression_vol) / (127*127);
		vol = vol * vp->reg.amplitude / 127;

		LIMITVALUE(vol, 0, 127);

		/* calc to attenuation */
		vol = snd_sf_vol_table[vol];

	} else {
		main_vol = chan->control[MIDI_CTL_MSB_MAIN_VOLUME] * vp->reg.amplitude / 127;
		LIMITVALUE(main_vol, 0, 127);

		vol = voltab1[main_vol] + voltab2[vp->velocity];
		vol = (vol * 8) / 3;
		vol += vp->reg.attenuation;
		vol += ((0x100 - vol) * expressiontab[expression_vol])/128;
	}

	master_vol = port->chset.gs_master_volume;
	LIMITVALUE(master_vol, 0, 127);
	vol += snd_sf_vol_table[master_vol];
	vol += port->volume_atten;

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	if (chan->private) {
		struct snd_emux_effect_table *fx = chan->private;
		vol += fx->val[EMUX_FX_ATTEN];
	}
#endif

	LIMITVALUE(vol, 0, 255);
	if (vp->avol == vol)
		return 0; /* value unchanged */

	vp->avol = vol;
	if (!SF_IS_DRUM_BANK(get_bank(port, chan))
	    && LO_BYTE(vp->reg.parm.volatkhld) < 0x7d) {
		int atten;
		if (vp->velocity < 70)
			atten = 70;
		else
			atten = vp->velocity;
		vp->acutoff = (atten * vp->reg.parm.cutoff + 0xa0) >> 7;
	} else {
		vp->acutoff = vp->reg.parm.cutoff;
	}

	return 1; /* value changed */
}

/*
 * calculate pitch offset
 *
 * 0xE000 is no pitch offset at 44100Hz sample.
 * Every 4096 is one octave.
 */

static int
calc_pitch(struct snd_emux_voice *vp)
{
	struct snd_midi_channel *chan = vp->chan;
	int offset;

	/* calculate offset */
	if (vp->reg.fixkey >= 0) {
		offset = (vp->reg.fixkey - vp->reg.root) * 4096 / 12;
	} else {
		offset = (vp->note - vp->reg.root) * 4096 / 12;
	}
	offset = (offset * vp->reg.scaleTuning) / 100;
	offset += vp->reg.tune * 4096 / 1200;
	if (chan->midi_pitchbend != 0) {
		/* (128 * 8192: 1 semitone) ==> (4096: 12 semitones) */
		offset += chan->midi_pitchbend * chan->gm_rpn_pitch_bend_range / 3072;
	}

	/* tuning via RPN:
	 *   coarse = -8192 to 8192 (100 cent per 128)
	 *   fine = -8192 to 8192 (max=100cent)
	 */
	/* 4096 = 1200 cents in emu8000 parameter */
	offset += chan->gm_rpn_coarse_tuning * 4096 / (12 * 128);
	offset += chan->gm_rpn_fine_tuning / 24;

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	/* add initial pitch correction */
	if (chan->private) {
		struct snd_emux_effect_table *fx = chan->private;
		if (fx->flag[EMUX_FX_INIT_PITCH])
			offset += fx->val[EMUX_FX_INIT_PITCH];
	}
#endif

	/* 0xe000: root pitch */
	offset += 0xe000 + vp->reg.rate_offset;
	offset += vp->emu->pitch_shift;
	LIMITVALUE(offset, 0, 0xffff);
	if (offset == vp->apitch)
		return 0; /* unchanged */
	vp->apitch = offset;
	return 1; /* value changed */
}

/*
 * Get the bank number assigned to the channel
 */
static int
get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan)
{
	int val;

	switch (port->chset.midi_mode) {
	case SNDRV_MIDI_MODE_XG:
		val = chan->control[MIDI_CTL_MSB_BANK];
		if (val == 127)
			return 128; /* return drum bank */
		return chan->control[MIDI_CTL_LSB_BANK];

	case SNDRV_MIDI_MODE_GS:
		if (chan->drum_channel)
			return 128;
		/* ignore LSB (bank map) */
		return chan->control[MIDI_CTL_MSB_BANK];
		
	default:
		if (chan->drum_channel)
			return 128;
		return chan->control[MIDI_CTL_MSB_BANK];
	}
}


/* Look for the zones matching with the given note and velocity.
 * The resultant zones are stored on table.
 */
static int
get_zone(struct snd_emux *emu, struct snd_emux_port *port,
	 int *notep, int vel, struct snd_midi_channel *chan,
	 struct snd_sf_zone **table)
{
	int preset, bank, def_preset, def_bank;

	bank = get_bank(port, chan);
	preset = chan->midi_program;

	if (SF_IS_DRUM_BANK(bank)) {
		def_preset = port->ctrls[EMUX_MD_DEF_DRUM];
		def_bank = bank;
	} else {
		def_preset = preset;
		def_bank = port->ctrls[EMUX_MD_DEF_BANK];
	}

	return snd_soundfont_search_zone(emu->sflist, notep, vel, preset, bank,
					 def_preset, def_bank,
					 table, SNDRV_EMUX_MAX_MULTI_VOICES);
}

/*
 */
void
snd_emux_init_voices(struct snd_emux *emu)
{
	struct snd_emux_voice *vp;
	int i;
	unsigned long flags;

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (i = 0; i < emu->max_voices; i++) {
		vp = &emu->voices[i];
		vp->ch = -1; /* not used */
		vp->state = SNDRV_EMUX_ST_OFF;
		vp->chan = NULL;
		vp->port = NULL;
		vp->time = 0;
		vp->emu = emu;
		vp->hw = emu->hw;
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}

/*
 */
void snd_emux_lock_voice(struct snd_emux *emu, int voice)
{
	unsigned long flags;

	spin_lock_irqsave(&emu->voice_lock, flags);
	if (emu->voices[voice].state == SNDRV_EMUX_ST_OFF)
		emu->voices[voice].state = SNDRV_EMUX_ST_LOCKED;
	else
		snd_printk("invalid voice for lock %d (state = %x)\n",
			   voice, emu->voices[voice].state);
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}

/*
 */
void snd_emux_unlock_voice(struct snd_emux *emu, int voice)
{
	unsigned long flags;

	spin_lock_irqsave(&emu->voice_lock, flags);
	if (emu->voices[voice].state == SNDRV_EMUX_ST_LOCKED)
		emu->voices[voice].state = SNDRV_EMUX_ST_OFF;
	else
		snd_printk("invalid voice for unlock %d (state = %x)\n",
			   voice, emu->voices[voice].state);
	spin_unlock_irqrestore(&emu->voice_lock, flags);
}