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
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
|
/* $OpenBSD: midi.c,v 1.18 2010/04/03 17:59:17 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* TODO
*
* use shadow variables (to save NRPNs, LSB of controller)
* in the midi merger
*
* make output and input identical when only one
* input is used (fix running status)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "abuf.h"
#include "aproc.h"
#include "conf.h"
#include "dev.h"
#include "midi.h"
#ifdef DEBUG
#include "dbg.h"
#endif
/*
* input data rate is XFER / TIMO (in bytes per microsecond),
* it must be slightly larger than the MIDI standard 3125 bytes/s
*/
#define MIDITHRU_XFER 340
#define MIDITHRU_TIMO 100000
/*
* masks to extract command and channel of status byte
*/
#define MIDI_CMDMASK 0xf0
#define MIDI_CHANMASK 0x0f
/*
* MIDI status bytes of voice messages
*/
#define MIDI_NOFF 0x80 /* note off */
#define MIDI_NON 0x90 /* note on */
#define MIDI_KAT 0xa0 /* key after touch */
#define MIDI_CTL 0xb0 /* controller */
#define MIDI_PC 0xc0 /* program change */
#define MIDI_CAT 0xd0 /* channel after touch */
#define MIDI_BEND 0xe0 /* pitch bend */
#define MIDI_ACK 0xfe /* active sensing message */
/*
* MIDI controller numbers
*/
#define MIDI_CTLVOL 7 /* volume */
#define MIDI_CTLPAN 11 /* pan */
/*
* length of voice and common messages (status byte included)
*/
unsigned voice_len[] = { 3, 3, 3, 3, 2, 2, 3 };
unsigned common_len[] = { 0, 2, 3, 2, 0, 0, 1, 1 };
/*
* send the message stored in of ibuf->r.midi.msg to obuf
*/
void
thru_flush(struct aproc *p, struct abuf *ibuf, struct abuf *obuf)
{
unsigned ocount, itodo;
unsigned char *odata, *idata;
itodo = ibuf->r.midi.used;
idata = ibuf->r.midi.msg;
#ifdef DEBUG
if (debug_level >= 4) {
aproc_dbg(p);
dbg_puts(": flushing ");
dbg_putu(itodo);
dbg_puts(" byte message\n");
}
#endif
while (itodo > 0) {
if (!ABUF_WOK(obuf)) {
#ifdef DEBUG
if (debug_level >= 4) {
aproc_dbg(p);
dbg_puts(": overrun, discarding ");
dbg_putu(obuf->used);
dbg_puts(" bytes\n");
}
#endif
abuf_rdiscard(obuf, obuf->used);
if (p->u.thru.owner == ibuf)
p->u.thru.owner = NULL;
return;
}
odata = abuf_wgetblk(obuf, &ocount, 0);
if (ocount > itodo)
ocount = itodo;
memcpy(odata, idata, ocount);
abuf_wcommit(obuf, ocount);
itodo -= ocount;
idata += ocount;
}
ibuf->r.midi.used = 0;
p->u.thru.owner = ibuf;
}
/*
* send the real-time message (one byte) to obuf, similar to thrui_flush()
*/
void
thru_rt(struct aproc *p, struct abuf *ibuf, struct abuf *obuf, unsigned c)
{
unsigned ocount;
unsigned char *odata;
#ifdef DEBUG
if (debug_level >= 4) {
aproc_dbg(p);
dbg_puts(": ");
dbg_putu(c);
dbg_puts(": flushing realtime message\n");
}
#endif
if (c == MIDI_ACK)
return;
if (!ABUF_WOK(obuf)) {
#ifdef DEBUG
if (debug_level >= 4) {
aproc_dbg(p);
dbg_puts(": overrun, discarding ");
dbg_putu(obuf->used);
dbg_puts(" bytes\n");
}
#endif
abuf_rdiscard(obuf, obuf->used);
if (p->u.thru.owner == ibuf)
p->u.thru.owner = NULL;
}
odata = abuf_wgetblk(obuf, &ocount, 0);
odata[0] = c;
abuf_wcommit(obuf, 1);
}
/*
* parse ibuf contents and store each message into obuf,
* use at most ``todo'' bytes (for throttling)
*/
void
thru_bcopy(struct aproc *p, struct abuf *ibuf, struct abuf *obuf, unsigned todo)
{
unsigned char *idata;
unsigned c, icount, ioffs;
idata = NULL;
icount = ioffs = 0;
for (;;) {
if (icount == 0) {
if (todo == 0)
break;
idata = abuf_rgetblk(ibuf, &icount, ioffs);
if (icount > todo)
icount = todo;
if (icount == 0)
break;
todo -= icount;
ioffs += icount;
}
c = *idata++;
icount--;
if (c < 0x80) {
if (ibuf->r.midi.idx == 0 && ibuf->r.midi.st) {
ibuf->r.midi.msg[ibuf->r.midi.used++] = ibuf->r.midi.st;
ibuf->r.midi.idx++;
}
ibuf->r.midi.msg[ibuf->r.midi.used++] = c;
ibuf->r.midi.idx++;
if (ibuf->r.midi.idx == ibuf->r.midi.len) {
thru_flush(p, ibuf, obuf);
if (ibuf->r.midi.st >= 0xf0)
ibuf->r.midi.st = 0;
ibuf->r.midi.idx = 0;
}
if (ibuf->r.midi.used == MIDI_MSGMAX) {
if (ibuf->r.midi.used == ibuf->r.midi.idx ||
p->u.thru.owner == ibuf)
thru_flush(p, ibuf, obuf);
else
ibuf->r.midi.used = 0;
}
} else if (c < 0xf8) {
if (ibuf->r.midi.used == ibuf->r.midi.idx ||
p->u.thru.owner == ibuf) {
thru_flush(p, ibuf, obuf);
} else
ibuf->r.midi.used = 0;
ibuf->r.midi.msg[0] = c;
ibuf->r.midi.used = 1;
ibuf->r.midi.len = (c >= 0xf0) ?
common_len[c & 7] :
voice_len[(c >> 4) & 7];
if (ibuf->r.midi.len == 1) {
thru_flush(p, ibuf, obuf);
ibuf->r.midi.idx = 0;
ibuf->r.midi.st = 0;
ibuf->r.midi.len = 0;
} else {
ibuf->r.midi.st = c;
ibuf->r.midi.idx = 1;
}
} else {
thru_rt(p, ibuf, obuf, c);
}
}
}
int
thru_in(struct aproc *p, struct abuf *ibuf)
{
struct abuf *i, *inext;
unsigned todo;
if (!ABUF_ROK(ibuf))
return 0;
if (ibuf->tickets == 0) {
#ifdef DEBUG
if (debug_level >= 4) {
abuf_dbg(ibuf);
dbg_puts(": out of tickets, blocking\n");
}
#endif
return 0;
}
todo = ibuf->used;
if (todo > ibuf->tickets)
todo = ibuf->tickets;
ibuf->tickets -= todo;
for (i = LIST_FIRST(&p->obuflist); i != NULL; i = inext) {
inext = LIST_NEXT(i, oent);
if (ibuf->duplex == i)
continue;
thru_bcopy(p, ibuf, i, todo);
(void)abuf_flush(i);
}
abuf_rdiscard(ibuf, todo);
return 1;
}
int
thru_out(struct aproc *p, struct abuf *obuf)
{
return 0;
}
void
thru_eof(struct aproc *p, struct abuf *ibuf)
{
if (!(p->flags & APROC_QUIT))
return;
if (LIST_EMPTY(&p->ibuflist))
aproc_del(p);
}
void
thru_hup(struct aproc *p, struct abuf *obuf)
{
}
void
thru_newin(struct aproc *p, struct abuf *ibuf)
{
ibuf->r.midi.used = 0;
ibuf->r.midi.len = 0;
ibuf->r.midi.idx = 0;
ibuf->r.midi.st = 0;
ibuf->tickets = MIDITHRU_XFER;
}
void
thru_done(struct aproc *p)
{
timo_del(&p->u.thru.timo);
}
struct aproc_ops thru_ops = {
"thru",
thru_in,
thru_out,
thru_eof,
thru_hup,
thru_newin,
NULL, /* newout */
NULL, /* ipos */
NULL, /* opos */
thru_done
};
/*
* call-back invoked periodically to implement throttling at each invocation
* gain more ``tickets'' for processing. If one of the buffer was blocked by
* the throttelling mechanism, then run it
*/
void
thru_cb(void *addr)
{
struct aproc *p = (struct aproc *)addr;
struct abuf *i, *inext;
unsigned tickets;
timo_add(&p->u.thru.timo, MIDITHRU_TIMO);
for (i = LIST_FIRST(&p->ibuflist); i != NULL; i = inext) {
inext = LIST_NEXT(i, ient);
tickets = i->tickets;
i->tickets = MIDITHRU_XFER;
if (tickets == 0)
abuf_run(i);
}
}
struct aproc *
thru_new(char *name)
{
struct aproc *p;
p = aproc_new(&thru_ops, name);
p->u.thru.owner = NULL;
timo_set(&p->u.thru.timo, thru_cb, p);
timo_add(&p->u.thru.timo, MIDITHRU_TIMO);
return p;
}
#ifdef DEBUG
void
ctl_slotdbg(struct aproc *p, int slot)
{
struct ctl_slot *s;
aproc_dbg(p);
if (slot < 0) {
dbg_puts("/none");
} else {
s = p->u.ctl.slot + slot;
dbg_puts(s->name);
dbg_putu(s->unit);
dbg_puts("=");
dbg_putu(s->vol);
dbg_puts("/");
switch (s->tstate) {
case CTL_OFF:
dbg_puts("off");
break;
case CTL_RUN:
dbg_puts("run");
break;
case CTL_START:
dbg_puts("sta");
break;
case CTL_STOP:
dbg_puts("stp");
break;
default:
dbg_puts("unk");
break;
}
}
}
#endif
/*
* broadcast a message to all output buffers on the behalf of ibuf.
* ie. don't sent back the message to the sender
*/
void
ctl_sendmsg(struct aproc *p, struct abuf *ibuf, unsigned char *msg, unsigned len)
{
unsigned ocount, itodo;
unsigned char *odata, *idata;
struct abuf *i, *inext;
for (i = LIST_FIRST(&p->obuflist); i != NULL; i = inext) {
inext = LIST_NEXT(i, oent);
if (i->duplex == ibuf)
continue;
itodo = len;
idata = msg;
while (itodo > 0) {
if (!ABUF_WOK(i)) {
#ifdef DEBUG
if (debug_level >= 4) {
abuf_dbg(i);
dbg_puts(": overrun, discarding ");
dbg_putu(i->used);
dbg_puts(" bytes\n");
}
#endif
abuf_rdiscard(i, i->used);
}
odata = abuf_wgetblk(i, &ocount, 0);
if (ocount > itodo)
ocount = itodo;
#ifdef DEBUG
if (debug_level >= 4) {
abuf_dbg(i);
dbg_puts(": stored ");
dbg_putu(ocount);
dbg_puts(" bytes\n");
}
#endif
memcpy(odata, idata, ocount);
abuf_wcommit(i, ocount);
itodo -= ocount;
idata += ocount;
}
(void)abuf_flush(i);
}
}
/*
* send a quarter frame MTC message
*/
void
ctl_qfr(struct aproc *p)
{
unsigned char buf[2];
unsigned data;
switch (p->u.ctl.qfr) {
case 0:
data = p->u.ctl.fr & 0xf;
break;
case 1:
data = p->u.ctl.fr >> 4;
break;
case 2:
data = p->u.ctl.sec & 0xf;
break;
case 3:
data = p->u.ctl.sec >> 4;
break;
case 4:
data = p->u.ctl.min & 0xf;
break;
case 5:
data = p->u.ctl.min >> 4;
break;
case 6:
data = p->u.ctl.hr & 0xf;
break;
case 7:
data = (p->u.ctl.hr >> 4) | (p->u.ctl.fps_id << 1);
/*
* tick messages are sent 2 frames ahead
*/
p->u.ctl.fr += 2;
if (p->u.ctl.fr < p->u.ctl.fps)
break;
p->u.ctl.fr -= p->u.ctl.fps;
p->u.ctl.sec++;
if (p->u.ctl.sec < 60)
break;;
p->u.ctl.sec = 0;
p->u.ctl.min++;
if (p->u.ctl.min < 60)
break;
p->u.ctl.min = 0;
p->u.ctl.hr++;
if (p->u.ctl.hr < 24)
break;
p->u.ctl.hr = 0;
break;
default:
/* NOTREACHED */
data = 0;
}
buf[0] = 0xf1;
buf[1] = (p->u.ctl.qfr << 4) | data;
p->u.ctl.qfr++;
p->u.ctl.qfr &= 7;
ctl_sendmsg(p, NULL, buf, 2);
}
/*
* send a full frame MTC message
*/
void
ctl_full(struct aproc *p)
{
unsigned char buf[10];
unsigned origin = p->u.ctl.origin;
unsigned fps = p->u.ctl.fps;
p->u.ctl.hr = (origin / (3600 * MTC_SEC)) % 24;
p->u.ctl.min = (origin / (60 * MTC_SEC)) % 60;
p->u.ctl.sec = (origin / MTC_SEC) % 60;
p->u.ctl.fr = (origin / (MTC_SEC / fps)) % fps;
buf[0] = 0xf0;
buf[1] = 0x7f;
buf[2] = 0x7f;
buf[3] = 0x01;
buf[4] = 0x01;
buf[5] = p->u.ctl.hr | (p->u.ctl.fps_id << 5);
buf[6] = p->u.ctl.min;
buf[7] = p->u.ctl.sec;
buf[8] = p->u.ctl.fr;
buf[9] = 0xf7;
p->u.ctl.qfr = 0;
ctl_sendmsg(p, NULL, buf, 10);
}
/*
* find the best matching free slot index (ie midi channel).
* return -1, if there are no free slots anymore
*/
int
ctl_getidx(struct aproc *p, char *who)
{
char *s;
struct ctl_slot *slot;
char name[CTL_NAMEMAX];
unsigned i, unit, umap = 0;
unsigned ser, bestser, bestidx;
/*
* create a ``valid'' control name (lowcase, remove [^a-z], trucate)
*/
for (i = 0, s = who; ; s++) {
if (i == CTL_NAMEMAX - 1 || *s == '\0') {
name[i] = '\0';
break;
} else if (*s >= 'A' && *s <= 'Z') {
name[i++] = *s + 'a' - 'A';
} else if (*s >= 'a' && *s <= 'z')
name[i++] = *s;
}
if (i == 0)
strlcpy(name, "noname", CTL_NAMEMAX);
/*
* find the instance number of the control name
*/
for (i = 0, slot = p->u.ctl.slot; i < CTL_NSLOT; i++, slot++) {
if (slot->ops == NULL)
continue;
if (strcmp(slot->name, name) == 0)
umap |= (1 << i);
}
for (unit = 0; ; unit++) {
if (unit == CTL_NSLOT)
return -1;
if ((umap & (1 << unit)) == 0)
break;
}
#ifdef DEBUG
if (debug_level >= 3) {
aproc_dbg(p);
dbg_puts(": new control name is ");
dbg_puts(name);
dbg_putu(unit);
dbg_puts("\n");
}
#endif
/*
* find a free controller slot with the same name/unit
*/
for (i = 0, slot = p->u.ctl.slot; i < CTL_NSLOT; i++, slot++) {
if (slot->ops == NULL &&
strcmp(slot->name, name) == 0 &&
slot->unit == unit) {
#ifdef DEBUG
if (debug_level >= 3) {
aproc_dbg(p);
dbg_puts(": found slot ");
dbg_putu(i);
dbg_puts("\n");
}
#endif
return i;
}
}
/*
* couldn't find a matching slot, pick oldest free slot
* and set its name/unit
*/
bestser = 0;
bestidx = CTL_NSLOT;
for (i = 0, slot = p->u.ctl.slot; i < CTL_NSLOT; i++, slot++) {
if (slot->ops != NULL)
continue;
ser = p->u.ctl.serial - slot->serial;
if (ser > bestser) {
bestser = ser;
bestidx = i;
}
}
if (bestidx == CTL_NSLOT)
return -1;
slot = p->u.ctl.slot + bestidx;
strlcpy(slot->name, name, CTL_NAMEMAX);
slot->serial = p->u.ctl.serial++;
slot->unit = unit;
slot->vol = MIDI_MAXCTL;
#ifdef DEBUG
if (debug_level >= 3) {
aproc_dbg(p);
dbg_puts(": overwritten slot ");
dbg_putu(bestidx);
dbg_puts("\n");
}
#endif
return bestidx;
}
/*
* check that all clients controlled by MMC are ready to start,
* if so, start them all but the caller
*/
int
ctl_trystart(struct aproc *p, int caller)
{
unsigned i;
struct ctl_slot *s;
if (p->u.ctl.tstate != CTL_START) {
#ifdef DEBUG
aproc_dbg(p);
dbg_puts(": not in starting state\n");
#endif
return 0;
}
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
if (!s->ops || i == caller)
continue;
if (s->tstate != CTL_OFF && s->tstate != CTL_START) {
#ifdef DEBUG
ctl_slotdbg(p, i);
dbg_puts(": not ready to start, start delayed\n");
#endif
return 0;
}
}
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
if (!s->ops || i == caller)
continue;
if (s->tstate == CTL_START) {
#ifdef DEBUG
ctl_slotdbg(p, i);
dbg_puts(": started\n");
#endif
s->tstate = CTL_RUN;
s->ops->start(s->arg);
}
}
if (caller >= 0)
p->u.ctl.slot[caller].tstate = CTL_RUN;
p->u.ctl.tstate = CTL_RUN;
p->u.ctl.delta = MTC_SEC * dev_getpos();
if (dev_rate % (30 * 4 * dev_round)) {
p->u.ctl.fps_id = MTC_FPS_30;
p->u.ctl.fps = 30;
} else if (dev_rate % (25 * 4 * dev_round)) {
p->u.ctl.fps_id = MTC_FPS_25;
p->u.ctl.fps = 25;
} else {
p->u.ctl.fps_id = MTC_FPS_24;
p->u.ctl.fps = 24;
}
#ifdef DEBUG
ctl_slotdbg(p, caller);
dbg_puts(": started server at ");
dbg_puti(p->u.ctl.delta);
dbg_puts(", ");
dbg_puti(p->u.ctl.fps);
dbg_puts(" mtc fps\n");
#endif
ctl_full(p);
return 1;
}
/*
* allocate a new slot and register the given call-backs
*/
int
ctl_slotnew(struct aproc *p, char *who, struct ctl_ops *ops, void *arg, int tr)
{
int idx;
struct ctl_slot *s;
if (p == NULL)
return -1;
idx = ctl_getidx(p, who);
if (idx < 0)
return -1;
s = p->u.ctl.slot + idx;
s->ops = ops;
s->arg = arg;
s->tstate = tr ? CTL_STOP : CTL_OFF;
s->ops->vol(s->arg, s->vol);
ctl_slotvol(p, idx, s->vol);
return idx;
}
/*
* release the given slot
*/
void
ctl_slotdel(struct aproc *p, int index)
{
unsigned i;
struct ctl_slot *s;
if (p == NULL)
return;
p->u.ctl.slot[index].ops = NULL;
if (!(p->flags & APROC_QUIT))
return;
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
if (s->ops)
return;
}
if (!LIST_EMPTY(&p->obuflist) || !LIST_EMPTY(&p->ibuflist))
aproc_del(p);
}
/*
* called at every clock tick by the mixer, delta is positive, unless
* there's an overrun/underrun
*/
void
ctl_ontick(struct aproc *p, int delta)
{
int qfrlen;
/*
* don't send ticks before the start signal
*/
if (p->u.ctl.tstate != CTL_RUN)
return;
p->u.ctl.delta += delta * MTC_SEC;
/*
* don't send ticks during the count-down
*/
if (p->u.ctl.delta < 0)
return;
qfrlen = dev_rate * (MTC_SEC / (4 * p->u.ctl.fps));
while (p->u.ctl.delta >= qfrlen) {
ctl_qfr(p);
p->u.ctl.delta -= qfrlen;
}
}
/*
* notifty the mixer that volume changed, called by whom allocad the slot using
* ctl_slotnew(). Note: it doesn't make sens to call this from within the
* call-back.
*/
void
ctl_slotvol(struct aproc *p, int slot, unsigned vol)
{
unsigned char msg[3];
if (p == NULL)
return;
#ifdef DEBUG
if (debug_level >= 3) {
ctl_slotdbg(p, slot);
dbg_puts(": changing volume to ");
dbg_putu(vol);
dbg_puts("\n");
}
#endif
p->u.ctl.slot[slot].vol = vol;
msg[0] = MIDI_CTL | slot;
msg[1] = MIDI_CTLVOL;
msg[2] = vol;
ctl_sendmsg(p, NULL, msg, 3);
}
/*
* notify the MMC layer that the stream is attempting
* to start. If other streams are not ready, 0 is returned meaning
* that the stream should wait. If other streams are ready, they
* are started, and the caller should start immediately.
*/
int
ctl_slotstart(struct aproc *p, int slot)
{
struct ctl_slot *s = p->u.ctl.slot + slot;
if (p == NULL)
return 1;
if (s->tstate == CTL_OFF || p->u.ctl.tstate == CTL_OFF)
return 1;
/*
* if the server already started (the client missed the
* start rendez-vous) or the server is stopped, then
* tag the client as ``wanting to start''
*/
s->tstate = CTL_START;
return ctl_trystart(p, slot);
}
/*
* notify the MMC layer that the stream no longer is trying to
* start (or that it just stopped), meaning that its ``start'' call-back
* shouldn't be called anymore
*/
void
ctl_slotstop(struct aproc *p, int slot)
{
struct ctl_slot *s = p->u.ctl.slot + slot;
if (p == NULL)
return;
/*
* tag the stream as not trying to start,
* unless MMC is turned off
*/
if (s->tstate != CTL_OFF)
s->tstate = CTL_STOP;
}
/*
* handle a MIDI event received from ibuf
*/
void
ctl_ev(struct aproc *p, struct abuf *ibuf)
{
unsigned chan;
struct ctl_slot *slot;
unsigned fps;
#ifdef DEBUG
unsigned i;
if (debug_level >= 3) {
abuf_dbg(ibuf);
dbg_puts(": got event:");
for (i = 0; i < ibuf->r.midi.idx; i++) {
dbg_puts(" ");
dbg_putx(ibuf->r.midi.msg[i]);
}
dbg_puts("\n");
}
#endif
if ((ibuf->r.midi.msg[0] & MIDI_CMDMASK) == MIDI_CTL &&
ibuf->r.midi.msg[1] == MIDI_CTLVOL) {
chan = ibuf->r.midi.msg[0] & MIDI_CHANMASK;
if (chan >= CTL_NSLOT)
return;
slot = p->u.ctl.slot + chan;
if (slot->ops == NULL)
return;
slot->vol = ibuf->r.midi.msg[2];
slot->ops->vol(slot->arg, slot->vol);
ctl_sendmsg(p, ibuf, ibuf->r.midi.msg, ibuf->r.midi.len);
}
if (ibuf->r.midi.idx == 6 &&
ibuf->r.midi.msg[0] == 0xf0 &&
ibuf->r.midi.msg[1] == 0x7f && /* type is realtime */
ibuf->r.midi.msg[3] == 0x06 && /* subtype is mmc */
ibuf->r.midi.msg[5] == 0xf7) { /* subtype is mmc */
switch (ibuf->r.midi.msg[4]) {
case 0x01: /* mmc stop */
#ifdef DEBUG
if (debug_level >= 1) {
abuf_dbg(ibuf);
dbg_puts(": mmc stop\n");
}
#endif
if (p->u.ctl.tstate == CTL_RUN ||
p->u.ctl.tstate == CTL_START)
p->u.ctl.tstate = CTL_STOP;
#ifdef DEBUG
else {
if (debug_level >= 1) {
aproc_dbg(p);
dbg_puts(": ignored mmc stop\n");
}
}
#endif
break;
case 0x02: /* mmc start */
#ifdef DEBUG
if (debug_level >= 1) {
abuf_dbg(ibuf);
dbg_puts(": mmc start\n");
}
#endif
if (p->u.ctl.tstate == CTL_STOP) {
p->u.ctl.tstate = CTL_START;
(void)ctl_trystart(p, -1);
#ifdef DEBUG
} else {
if (debug_level >= 1) {
abuf_dbg(ibuf);
dbg_puts(": ignoring mmc start\n");
}
#endif
}
break;
}
}
if (ibuf->r.midi.idx == 13 &&
ibuf->r.midi.msg[0] == 0xf0 &&
ibuf->r.midi.msg[1] == 0x7f &&
ibuf->r.midi.msg[3] == 0x06 &&
ibuf->r.midi.msg[4] == 0x44 &&
ibuf->r.midi.msg[5] == 0x06 &&
ibuf->r.midi.msg[6] == 0x01 &&
ibuf->r.midi.msg[12] == 0xf7) {
switch (ibuf->r.midi.msg[7] >> 5) {
case MTC_FPS_24:
fps = 24;
break;
case MTC_FPS_25:
fps = 25;
break;
case MTC_FPS_30:
fps = 30;
break;
default:
p->u.ctl.origin = 0;
return;
}
p->u.ctl.origin =
(ibuf->r.midi.msg[7] & 0x1f) * 3600 * MTC_SEC +
ibuf->r.midi.msg[8] * 60 * MTC_SEC +
ibuf->r.midi.msg[9] * MTC_SEC +
ibuf->r.midi.msg[10] * (MTC_SEC / fps) +
ibuf->r.midi.msg[11] * (MTC_SEC / 100 / fps);
#ifdef DEBUG
if (debug_level >= 1) {
aproc_dbg(p);
dbg_puts(": relocated to ");
dbg_putu(p->u.ctl.origin);
dbg_puts("\n");
}
#endif
}
}
int
ctl_in(struct aproc *p, struct abuf *ibuf)
{
unsigned char *idata;
unsigned c, i, icount;
if (!ABUF_ROK(ibuf))
return 0;
idata = abuf_rgetblk(ibuf, &icount, 0);
for (i = 0; i < icount; i++) {
c = *idata++;
if (c >= 0xf8) {
/* clock events not used yet */
} else if (c >= 0xf0) {
if (ibuf->r.midi.st == 0xf0 && c == 0xf7 &&
ibuf->r.midi.idx < MIDI_MSGMAX) {
ibuf->r.midi.msg[ibuf->r.midi.idx++] = c;
ctl_ev(p, ibuf);
continue;
}
ibuf->r.midi.msg[0] = c;
ibuf->r.midi.len = common_len[c & 7];
ibuf->r.midi.st = c;
ibuf->r.midi.idx = 1;
} else if (c >= 0x80) {
ibuf->r.midi.msg[0] = c;
ibuf->r.midi.len = voice_len[(c >> 4) & 7];
ibuf->r.midi.st = c;
ibuf->r.midi.idx = 1;
} else if (ibuf->r.midi.st) {
if (ibuf->r.midi.idx == MIDI_MSGMAX)
continue;
if (ibuf->r.midi.idx == 0)
ibuf->r.midi.msg[ibuf->r.midi.idx++] = ibuf->r.midi.st;
ibuf->r.midi.msg[ibuf->r.midi.idx++] = c;
if (ibuf->r.midi.idx == ibuf->r.midi.len) {
ctl_ev(p, ibuf);
ibuf->r.midi.idx = 0;
}
}
}
abuf_rdiscard(ibuf, icount);
return 1;
}
int
ctl_out(struct aproc *p, struct abuf *obuf)
{
return 0;
}
void
ctl_eof(struct aproc *p, struct abuf *ibuf)
{
unsigned i;
struct ctl_slot *s;
if (!(p->flags & APROC_QUIT))
return;
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
if (s->ops)
return;
}
if (!LIST_EMPTY(&p->obuflist) || !LIST_EMPTY(&p->ibuflist))
aproc_del(p);
}
void
ctl_hup(struct aproc *p, struct abuf *obuf)
{
unsigned i;
struct ctl_slot *s;
if (!(p->flags & APROC_QUIT))
return;
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
if (s->ops)
return;
}
if (!LIST_EMPTY(&p->obuflist) || !LIST_EMPTY(&p->ibuflist))
aproc_del(p);
}
void
ctl_newin(struct aproc *p, struct abuf *ibuf)
{
ibuf->r.midi.used = 0;
ibuf->r.midi.len = 0;
ibuf->r.midi.idx = 0;
ibuf->r.midi.st = 0;
}
void
ctl_done(struct aproc *p)
{
#ifdef DEBUG
unsigned i;
struct ctl_slot *s;
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
/*
* XXX: shouldn't we abord() here ?
*/
if (s->ops != NULL) {
ctl_slotdbg(p, i);
dbg_puts(": still in use\n");
}
}
#endif
}
struct aproc_ops ctl_ops = {
"ctl",
ctl_in,
ctl_out,
ctl_eof,
ctl_hup,
ctl_newin,
NULL, /* newout */
NULL, /* ipos */
NULL, /* opos */
ctl_done
};
struct aproc *
ctl_new(char *name)
{
struct aproc *p;
struct ctl_slot *s;
unsigned i;
p = aproc_new(&ctl_ops, name);
p->u.ctl.serial = 0;
p->u.ctl.tstate = CTL_STOP;
for (i = 0, s = p->u.ctl.slot; i < CTL_NSLOT; i++, s++) {
p->u.ctl.slot[i].unit = i;
p->u.ctl.slot[i].ops = NULL;
p->u.ctl.slot[i].vol = MIDI_MAXCTL;
p->u.ctl.slot[i].tstate = CTL_OFF;
p->u.ctl.slot[i].serial = p->u.ctl.serial++;
strlcpy(p->u.ctl.slot[i].name, "unknown", CTL_NAMEMAX);
}
return p;
}
|