/
readmidi.c
1070 lines (966 loc) · 27.1 KB
/
readmidi.c
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
/*
TiMidity -- Experimental MIDI to WAVE converter
Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
This program is free software; you can redistribute it and/or modify
it under the terms of the Perl Artistic License, available in COPYING.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <SDL_rwops.h>
#include "config.h"
#include "common.h"
#include "instrum.h"
#include "playmidi.h"
#include "readmidi.h"
#include "output.h"
#include "ctrlmode.h"
int32 quietchannels=0;
static int midi_port_number;
char midi_name[FILENAME_MAX+1];
static int track_info, curr_track, curr_title_track;
static char title[128];
#if MAXCHAN <= 16
#define MERGE_CHANNEL_PORT(ch) ((int)(ch))
#else
#define MERGE_CHANNEL_PORT(ch) ((int)(ch) | (midi_port_number << 4))
#endif
/* to avoid some unnecessary parameter passing */
static MidiEventList *evlist;
static int32 event_count;
static SDL_RWops *rw;
static int32 at;
/* These would both fit into 32 bits, but they are often added in
large multiples, so it's simpler to have two roomy ints */
static int32 sample_increment, sample_correction; /*samples per MIDI delta-t*/
/* Computes how many (fractional) samples one MIDI delta-time unit contains */
static void compute_sample_increment(int32 tempo, int32 divisions)
{
double a;
a = (double) (tempo) * (double) (play_mode->rate) * (65536.0/1000000.0) /
(double)(divisions);
sample_correction = (int32)(a) & 0xFFFF;
sample_increment = (int32)(a) >> 16;
ctl->cmsg(CMSG_INFO, VERB_DEBUG, "Samples per delta-t: %d (correction %d)",
sample_increment, sample_correction);
}
/* Read variable-length number (7 bits per byte, MSB first) */
static int32 getvl(void)
{
int32 l=0;
uint8 c;
for (;;)
{
SDL_RWread(rw,&c,1,1);
l += (c & 0x7f);
if (!(c & 0x80)) return l;
l<<=7;
}
}
static int sysex(uint32 len, uint8 *syschan, uint8 *sysa, uint8 *sysb, SDL_RWops *rw)
{
unsigned char *s=(unsigned char *)safe_malloc(len);
int id, model, ch, port, adhi, adlo, cd, dta, dtb, dtc;
if (len != (uint32)SDL_RWread(rw, s, 1, len))
{
free(s);
return 0;
}
if (len<5) { free(s); return 0; }
if (curr_track == curr_title_track && track_info > 1) title[0] = '\0';
id=s[0]; port=s[1]; model=s[2]; adhi=s[3]; adlo=s[4];
if (id==0x7e && port==0x7f && model==0x09 && adhi==0x01)
{
ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "GM System On", len);
GM_System_On=1;
free(s);
return 0;
}
ch = adlo & 0x0f;
*syschan=(uint8)ch;
if (id==0x7f && len==7 && port==0x7f && model==0x04 && adhi==0x01)
{
ctl->cmsg(CMSG_TEXT, VERB_DEBUG, "Master Volume %d", s[4]+(s[5]<<7));
*sysa = s[4];
*sysb = s[5];
free(s);
return ME_MASTERVOLUME;
/** return s[4]+(s[5]<<7); **/
}
if (len<8) { free(s); return 0; }
port &=0x0f;
ch = (adlo & 0x0f) | ((port & 0x03) << 4);
*syschan=(uint8)ch;
cd=s[5]; dta=s[6];
if (len >= 8) dtb=s[7];
else dtb=-1;
if (len >= 9) dtc=s[8];
else dtc=-1;
free(s);
if (id==0x43 && model==0x4c)
{
if (!adhi && !adlo && cd==0x7e && !dta)
{
ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "XG System On", len);
XG_System_On=1;
#ifdef tplus
vol_table = xg_vol_table;
#endif
}
else if (adhi == 2 && adlo == 1)
{
if (dtb==8) dtb=3;
switch (cd)
{
case 0x00:
XG_System_reverb_type=(dta<<3)+dtb;
break;
case 0x20:
XG_System_chorus_type=((dta-64)<<3)+dtb;
break;
case 0x40:
XG_System_variation_type=dta;
break;
case 0x5a:
/* dta==0 Insertion; dta==1 System */
break;
default: break;
}
}
else if (adhi == 8 && cd <= 40)
{
*sysa = dta & 0x7f;
switch (cd)
{
case 0x01: /* bank select MSB */
return ME_TONE_KIT;
break;
case 0x02: /* bank select LSB */
return ME_TONE_BANK;
break;
case 0x03: /* program number */
/** MIDIEVENT(d->at, ME_PROGRAM, lastchan, a, 0); **/
return ME_PROGRAM;
break;
case 0x08: /* */
/* d->channel[adlo&0x0f].transpose = (char)(dta-64); */
channel[ch].transpose = (char)(dta-64);
ctl->cmsg(CMSG_TEXT, VERB_DEBUG, "transpose channel %d by %d",
(adlo&0x0f)+1, dta-64);
break;
case 0x0b: /* volume */
return ME_MAINVOLUME;
break;
case 0x0e: /* pan */
return ME_PAN;
break;
case 0x12: /* chorus send */
return ME_CHORUSDEPTH;
break;
case 0x13: /* reverb send */
return ME_REVERBERATION;
break;
case 0x14: /* variation send */
break;
case 0x18: /* filter cutoff */
return ME_BRIGHTNESS;
break;
case 0x19: /* filter resonance */
return ME_HARMONICCONTENT;
break;
default: break;
}
}
return 0;
}
else if (id==0x41 && model==0x42 && adhi==0x12 && adlo==0x40)
{
if (dtc<0) return 0;
if (!cd && dta==0x7f && !dtb && dtc==0x41)
{
ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "GS System On", len);
GS_System_On=1;
#ifdef tplus
vol_table = gs_vol_table;
#endif
}
else if (dta==0x15 && (cd&0xf0)==0x10)
{
int chan=cd&0x0f;
if (!chan) chan=9;
else if (chan<10) chan--;
chan = MERGE_CHANNEL_PORT(chan);
channel[chan].kit=dtb;
}
else if (cd==0x01) switch(dta)
{
case 0x30:
switch(dtb)
{
case 0: XG_System_reverb_type=16+0; break;
case 1: XG_System_reverb_type=16+1; break;
case 2: XG_System_reverb_type=16+2; break;
case 3: XG_System_reverb_type= 8+0; break;
case 4: XG_System_reverb_type= 8+1; break;
case 5: XG_System_reverb_type=32+0; break;
case 6: XG_System_reverb_type=8*17; break;
case 7: XG_System_reverb_type=8*18; break;
}
break;
case 0x38:
switch(dtb)
{
case 0: XG_System_chorus_type= 8+0; break;
case 1: XG_System_chorus_type= 8+1; break;
case 2: XG_System_chorus_type= 8+2; break;
case 3: XG_System_chorus_type= 8+4; break;
case 4: XG_System_chorus_type= -1; break;
case 5: XG_System_chorus_type= 8*3; break;
case 6: XG_System_chorus_type= -1; break;
case 7: XG_System_chorus_type= -1; break;
}
break;
}
return 0;
}
return 0;
}
/* Print a string from the file, followed by a newline. Any non-ASCII
or unprintable characters will be converted to periods. */
static int dumpstring(int32 len, const char *label)
{
signed char *s=safe_malloc(len+1);
if (len != (int32)SDL_RWread(rw, s, 1, len))
{
free(s);
return -1;
}
s[len]='\0';
while (len--)
{
if (s[len]<32)
s[len]='.';
}
ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "%s%s", label, s);
free(s);
return 0;
}
#define MIDIEVENT(at,t,ch,pa,pb) \
new=safe_malloc(sizeof(MidiEventList)); \
new->event.time=at; new->event.type=t; new->event.channel=ch; \
new->event.a=pa; new->event.b=pb; new->next=0;\
return new;
#define MAGIC_EOT ((MidiEventList *)(-1))
/* Read a MIDI event, returning a freshly allocated element that can
be linked to the event list */
static MidiEventList *read_midi_event(void)
{
static uint8 laststatus, lastchan;
static uint8 nrpn=0, rpn_msb[16], rpn_lsb[16]; /* one per channel */
uint8 me, type, a,b,c;
int32 len;
MidiEventList *new;
for (;;)
{
at+=getvl();
if (SDL_RWread(rw,&me,1,1)!=1)
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: read_midi_event: %s",
current_filename, strerror(errno));
return 0;
}
if(me==0xF0 || me == 0xF7) /* SysEx event */
{
int32 sret;
uint8 sysa=0, sysb=0, syschan=0;
len=getvl();
sret=sysex(len, &syschan, &sysa, &sysb, rw);
if (sret)
{
MIDIEVENT(at, sret, syschan, sysa, sysb);
}
}
else if(me==0xFF) /* Meta event */
{
SDL_RWread(rw,&type,1,1);
len=getvl();
if (type>0 && type<16)
{
static char *label[]={
"Text event: ", "Text: ", "Copyright: ", "Track name: ",
"Instrument: ", "Lyric: ", "Marker: ", "Cue point: "};
dumpstring(len, label[(type>7) ? 0 : type]);
}
else
switch(type)
{
case 0x21: /* MIDI port number */
if(len == 1)
{
SDL_RWread(rw,&midi_port_number,1,1);
if(midi_port_number == EOF)
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
"Warning: \"%s\": Short midi file.",
midi_name);
return 0;
}
midi_port_number &= 0x0f;
if (midi_port_number)
ctl->cmsg(CMSG_INFO, VERB_VERBOSE,
"(MIDI port number %d)", midi_port_number);
midi_port_number &= 0x03;
}
else SDL_RWseek(rw, len, RW_SEEK_CUR);
break;
case 0x2F: /* End of Track */
return MAGIC_EOT;
case 0x51: /* Tempo */
SDL_RWread(rw,&a,1,1); SDL_RWread(rw,&b,1,1); SDL_RWread(rw,&c,1,1);
MIDIEVENT(at, ME_TEMPO, c, a, b);
default:
ctl->cmsg(CMSG_INFO, VERB_DEBUG,
"(Meta event type 0x%02x, length %ld)", type, len);
SDL_RWseek(rw, len, RW_SEEK_CUR);
break;
}
}
else
{
a=me;
if (a & 0x80) /* status byte */
{
lastchan=a & 0x0F;
laststatus=(a>>4) & 0x07;
SDL_RWread(rw,&a, 1,1);
a &= 0x7F;
}
switch(laststatus)
{
case 0: /* Note off */
SDL_RWread(rw,&b, 1,1);
b &= 0x7F;
MIDIEVENT(at, ME_NOTEOFF, lastchan, a,b);
case 1: /* Note on */
SDL_RWread(rw,&b, 1,1);
b &= 0x7F;
if (curr_track == curr_title_track && track_info > 1) title[0] = '\0';
MIDIEVENT(at, ME_NOTEON, lastchan, a,b);
case 2: /* Key Pressure */
SDL_RWread(rw,&b, 1,1);
b &= 0x7F;
MIDIEVENT(at, ME_KEYPRESSURE, lastchan, a, b);
case 3: /* Control change */
SDL_RWread(rw,&b, 1,1);
b &= 0x7F;
{
int control=255;
switch(a)
{
case 7: control=ME_MAINVOLUME; break;
case 10: control=ME_PAN; break;
case 11: control=ME_EXPRESSION; break;
case 64: control=ME_SUSTAIN; break;
case 71: control=ME_HARMONICCONTENT; break;
case 72: control=ME_RELEASETIME; break;
case 73: control=ME_ATTACKTIME; break;
case 74: control=ME_BRIGHTNESS; break;
case 91: control=ME_REVERBERATION; break;
case 93: control=ME_CHORUSDEPTH; break;
case 120: control=ME_ALL_SOUNDS_OFF; break;
case 121: control=ME_RESET_CONTROLLERS; break;
case 123: control=ME_ALL_NOTES_OFF; break;
/* These should be the SCC-1 tone bank switch
commands. I don't know why there are two, or
why the latter only allows switching to bank 0.
Also, some MIDI files use 0 as some sort of
continuous controller. This will cause lots of
warnings about undefined tone banks. */
case 0: if (XG_System_On) control = ME_TONE_KIT; else control=ME_TONE_BANK; break;
case 32: if (XG_System_On) control = ME_TONE_BANK; break;
case 100: nrpn=0; rpn_msb[lastchan]=b; break;
case 101: nrpn=0; rpn_lsb[lastchan]=b; break;
case 99: nrpn=1; rpn_msb[lastchan]=b; break;
case 98: nrpn=1; rpn_lsb[lastchan]=b; break;
case 6:
if (nrpn)
{
if (rpn_msb[lastchan]==1) switch (rpn_lsb[lastchan])
{
#ifdef tplus
case 0x08: control=ME_VIBRATO_RATE; break;
case 0x09: control=ME_VIBRATO_DEPTH; break;
case 0x0a: control=ME_VIBRATO_DELAY; break;
#endif
case 0x20: control=ME_BRIGHTNESS; break;
case 0x21: control=ME_HARMONICCONTENT; break;
/*
case 0x63: envelope attack rate
case 0x64: envelope decay rate
case 0x66: envelope release rate
*/
}
else switch (rpn_msb[lastchan])
{
/*
case 0x14: filter cutoff frequency
case 0x15: filter resonance
case 0x16: envelope attack rate
case 0x17: envelope decay rate
case 0x18: pitch coarse
case 0x19: pitch fine
*/
case 0x1a: drumvolume[lastchan][0x7f & rpn_lsb[lastchan]] = b; break;
case 0x1c:
if (!b) b=(int) (127.0*rand()/(RAND_MAX));
drumpanpot[lastchan][0x7f & rpn_lsb[lastchan]] = b;
break;
case 0x1d: drumreverberation[lastchan][0x7f & rpn_lsb[lastchan]] = b; break;
case 0x1e: drumchorusdepth[lastchan][0x7f & rpn_lsb[lastchan]] = b; break;
/*
case 0x1f: variation send level
*/
}
ctl->cmsg(CMSG_INFO, VERB_DEBUG,
"(Data entry (MSB) for NRPN %02x,%02x: %ld)",
rpn_msb[lastchan], rpn_lsb[lastchan],
b);
break;
}
switch((rpn_msb[lastchan]<<8) | rpn_lsb[lastchan])
{
case 0x0000: /* Pitch bend sensitivity */
control=ME_PITCH_SENS;
break;
case 0x7F7F: /* RPN reset */
/* reset pitch bend sensitivity to 2 */
MIDIEVENT(at, ME_PITCH_SENS, lastchan, 2, 0);
default:
ctl->cmsg(CMSG_INFO, VERB_DEBUG,
"(Data entry (MSB) for RPN %02x,%02x: %ld)",
rpn_msb[lastchan], rpn_lsb[lastchan],
b);
break;
}
break;
default:
ctl->cmsg(CMSG_INFO, VERB_DEBUG,
"(Control %d: %d)", a, b);
break;
}
if (control != 255)
{
MIDIEVENT(at, control, lastchan, b, 0);
}
}
break;
case 4: /* Program change */
a &= 0x7f;
MIDIEVENT(at, ME_PROGRAM, lastchan, a, 0);
case 5: /* Channel pressure - NOT IMPLEMENTED */
break;
case 6: /* Pitch wheel */
SDL_RWread(rw,&b, 1,1);
b &= 0x7F;
MIDIEVENT(at, ME_PITCHWHEEL, lastchan, a, b);
default:
ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
"*** Can't happen: status 0x%02X, channel 0x%02X",
laststatus, lastchan);
break;
}
}
}
return new;
}
#undef MIDIEVENT
/* Read a midi track into the linked list, either merging with any previous
tracks or appending to them. */
static int read_track(int append)
{
MidiEventList *meep;
MidiEventList *next, *new;
int32 len, next_pos, pos;
char tmp[4];
meep=evlist;
if (append && meep)
{
/* find the last event in the list */
for (; meep->next; meep=meep->next)
;
at=meep->event.time;
}
else
at=0;
/* Check the formalities */
if ((SDL_RWread(rw,tmp,1,4) != 4) || (SDL_RWread(rw,&len,4,1) != 1))
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
"%s: Can't read track header.", current_filename);
return -1;
}
len=BE_LONG(len);
next_pos = SDL_RWtell(rw) + len;
if (memcmp(tmp, "MTrk", 4))
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
"%s: Corrupt MIDI file.", current_filename);
return -2;
}
for (;;)
{
if (!(new=read_midi_event())) /* Some kind of error */
return -2;
if (new==MAGIC_EOT) /* End-of-track Hack. */
{
pos = SDL_RWtell(rw);
if (pos < next_pos)
SDL_RWseek(rw, next_pos - pos, RW_SEEK_CUR);
return 0;
}
next=meep->next;
while (next && (next->event.time < new->event.time))
{
meep=next;
next=meep->next;
}
new->next=next;
meep->next=new;
event_count++; /* Count the event. (About one?) */
meep=new;
}
}
/* Free the linked event list from memory. */
static void free_midi_list(void)
{
MidiEventList *meep, *next;
if (!(meep=evlist)) return;
while (meep)
{
next=meep->next;
free(meep);
meep=next;
}
evlist=0;
}
static void xremap_percussion(int *banknumpt, int *this_notept, int this_kit) {
int i, newmap;
int banknum = *banknumpt;
int this_note = *this_notept;
int newbank, newnote;
if (this_kit != 127 && this_kit != 126) return;
for (i = 0; i < XMAPMAX; i++) {
newmap = xmap[i][0];
if (!newmap) return;
if (this_kit == 127 && newmap != XGDRUM) continue;
if (this_kit == 126 && newmap != SFXDRUM1) continue;
if (xmap[i][1] != banknum) continue;
if (xmap[i][3] != this_note) continue;
newbank = xmap[i][2];
newnote = xmap[i][4];
if (newbank == banknum && newnote == this_note) return;
if (!drumset[newbank]) return;
*banknumpt = newbank;
*this_notept = newnote;
return;
}
}
/* Allocate an array of MidiEvents and fill it from the linked list of
events, marking used instruments for loading. Convert event times to
samples: handle tempo changes. Strip unnecessary events from the list.
Free the linked list. */
static MidiEvent *groom_list(int32 divisions,int32 *eventsp,int32 *samplesp)
{
MidiEvent *groomed_list, *lp;
MidiEventList *meep;
int32 i, our_event_count, tempo, skip_this_event, new_value;
int32 sample_cum, samples_to_do, at, st, dt, counting_time;
int current_bank[MAXCHAN], current_banktype[MAXCHAN], current_set[MAXCHAN],
current_kit[MAXCHAN], current_program[MAXCHAN];
/* Or should each bank have its own current program? */
int dset, dnote, drumsflag, mprog;
for (i=0; i<MAXCHAN; i++)
{
current_bank[i]=0;
current_banktype[i]=0;
current_set[i]=0;
current_kit[i]=channel[i].kit;
current_program[i]=default_program;
}
tempo=500000;
compute_sample_increment(tempo, divisions);
/* This may allocate a bit more than we need */
groomed_list=lp=safe_malloc(sizeof(MidiEvent) * (event_count+1));
meep=evlist;
our_event_count=0;
st=at=sample_cum=0;
counting_time=2; /* We strip any silence before the first NOTE ON. */
for (i=0; i<event_count; i++)
{
skip_this_event=0;
ctl->cmsg(CMSG_INFO, VERB_DEBUG_SILLY,
"%6d: ch %2d: event %d (%d,%d)",
meep->event.time, meep->event.channel + 1,
meep->event.type, meep->event.a, meep->event.b);
if (meep->event.type==ME_TEMPO)
{
tempo=
meep->event.channel + meep->event.b * 256 + meep->event.a * 65536;
compute_sample_increment(tempo, divisions);
skip_this_event=1;
}
else if ((quietchannels & (1<<meep->event.channel)))
skip_this_event=1;
else switch (meep->event.type)
{
case ME_PROGRAM:
if (current_kit[meep->event.channel])
{
if (current_kit[meep->event.channel]==126)
{
/* note request for 2nd sfx rhythm kit */
if (meep->event.a && drumset[SFXDRUM2])
{
current_kit[meep->event.channel]=125;
current_set[meep->event.channel]=SFXDRUM2;
new_value=SFXDRUM2;
}
else if (!meep->event.a && drumset[SFXDRUM1])
{
current_set[meep->event.channel]=SFXDRUM1;
new_value=SFXDRUM1;
}
else
{
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"XG SFX drum set is undefined");
skip_this_event=1;
break;
}
}
if (drumset[meep->event.a]) /* Is this a defined drumset? */
new_value=meep->event.a;
else
{
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"Drum set %d is undefined", meep->event.a);
if (drumset[0])
new_value=meep->event.a=0;
else
{
skip_this_event=1;
break;
}
}
if (current_set[meep->event.channel] != new_value)
current_set[meep->event.channel]=new_value;
else
skip_this_event=1;
}
else
{
new_value=meep->event.a;
if ((current_program[meep->event.channel] != SPECIAL_PROGRAM)
&& (current_program[meep->event.channel] != new_value))
current_program[meep->event.channel] = new_value;
else
skip_this_event=1;
}
break;
case ME_NOTEON:
if (counting_time)
counting_time=1;
drumsflag = current_kit[meep->event.channel];
if (drumsflag) /* percussion channel? */
{
dset = current_set[meep->event.channel];
dnote=meep->event.a;
if (XG_System_On) xremap_percussion(&dset, &dnote, drumsflag);
/*if (current_config_pc42b) pcmap(&dset, &dnote, &mprog, &drumsflag);*/
if (drumsflag)
{
/* Mark this instrument to be loaded */
if (!(drumset[dset]->tone[dnote].layer))
{
drumset[dset]->tone[dnote].layer=
MAGIC_LOAD_INSTRUMENT;
}
else drumset[dset]->tone[dnote].last_used
= current_tune_number;
if (!channel[meep->event.channel].name) channel[meep->event.channel].name=
drumset[dset]->name;
}
}
if (!drumsflag) /* not percussion */
{
int chan=meep->event.channel;
int banknum;
if (current_banktype[chan]) banknum=SFXBANK;
else banknum=current_bank[chan];
mprog = current_program[chan];
if (mprog==SPECIAL_PROGRAM)
break;
if (XG_System_On && banknum==SFXBANK && !tonebank[SFXBANK] && tonebank[120])
banknum = 120;
/*if (current_config_pc42b) pcmap(&banknum, &dnote, &mprog, &drumsflag);*/
if (drumsflag)
{
/* Mark this instrument to be loaded */
if (!(drumset[dset]->tone[dnote].layer))
{
drumset[dset]->tone[dnote].layer=MAGIC_LOAD_INSTRUMENT;
}
else drumset[dset]->tone[dnote].last_used = current_tune_number;
if (!channel[meep->event.channel].name) channel[meep->event.channel].name=
drumset[dset]->name;
}
if (!drumsflag)
{
/* Mark this instrument to be loaded */
if (!(tonebank[banknum]->tone[mprog].layer))
{
tonebank[banknum]->tone[mprog].layer=MAGIC_LOAD_INSTRUMENT;
}
else tonebank[banknum]->tone[mprog].last_used = current_tune_number;
if (!channel[meep->event.channel].name) channel[meep->event.channel].name=
tonebank[banknum]->tone[mprog].name;
}
}
break;
case ME_TONE_KIT:
if (!meep->event.a || meep->event.a == 127)
{
new_value=meep->event.a;
if (current_kit[meep->event.channel] != new_value)
current_kit[meep->event.channel]=new_value;
else
skip_this_event=1;
break;
}
else if (meep->event.a == 126)
{
if (drumset[SFXDRUM1]) /* Is this a defined tone bank? */
new_value=meep->event.a;
else
{
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"XG rhythm kit %d is undefined", meep->event.a);
skip_this_event=1;
break;
}
current_set[meep->event.channel]=SFXDRUM1;
current_kit[meep->event.channel]=new_value;
break;
}
else if (meep->event.a != SFX_BANKTYPE)
{
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"XG kit %d is impossible", meep->event.a);
skip_this_event=1;
break;
}
if (current_kit[meep->event.channel])
{
skip_this_event=1;
break;
}
if (tonebank[SFXBANK] || tonebank[120]) /* Is this a defined tone bank? */
new_value=SFX_BANKTYPE;
else
{
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"XG Sfx bank is undefined");
skip_this_event=1;
break;
}
if (current_banktype[meep->event.channel]!=new_value)
current_banktype[meep->event.channel]=new_value;
else
skip_this_event=1;
break;
case ME_TONE_BANK:
if (current_kit[meep->event.channel])
{
skip_this_event=1;
break;
}
if (XG_System_On && meep->event.a > 0 && meep->event.a < 48) {
channel[meep->event.channel].variationbank=meep->event.a;
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"XG variation bank %d", meep->event.a);
new_value=meep->event.a=0;
}
else if (tonebank[meep->event.a]) /* Is this a defined tone bank? */
new_value=meep->event.a;
else
{
ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
"Tone bank %d is undefined", meep->event.a);
new_value=meep->event.a=0;
}
if (current_bank[meep->event.channel]!=new_value)
current_bank[meep->event.channel]=new_value;
else
skip_this_event=1;
break;
case ME_HARMONICCONTENT:
channel[meep->event.channel].harmoniccontent=meep->event.a;
break;
case ME_BRIGHTNESS:
channel[meep->event.channel].brightness=meep->event.a;
break;
}
/* Recompute time in samples*/
if ((dt=meep->event.time - at) && !counting_time)
{
samples_to_do=sample_increment * dt;
sample_cum += sample_correction * dt;
if (sample_cum & 0xFFFF0000)
{
samples_to_do += ((sample_cum >> 16) & 0xFFFF);
sample_cum &= 0x0000FFFF;
}
st += samples_to_do;
}
else if (counting_time==1) counting_time=0;
if (!skip_this_event)
{
/* Add the event to the list */
*lp=meep->event;
lp->time=st;
lp++;
our_event_count++;
}
at=meep->event.time;
meep=meep->next;
}
/* Add an End-of-Track event */
lp->time=st;
lp->type=ME_EOT;
our_event_count++;
free_midi_list();
*eventsp=our_event_count;
*samplesp=st;
return groomed_list;
}
MidiEvent *read_midi_file(SDL_RWops *mrw, int32 *count, int32 *sp)
{
int32 len, divisions;
int16 format, tracks, divisions_tmp;
int i;
char tmp[4];
rw = mrw;
event_count=0;
at=0;
evlist=0;
GM_System_On=GS_System_On=XG_System_On=0;
/* vol_table = def_vol_table; */
XG_System_reverb_type=XG_System_chorus_type=XG_System_variation_type=0;
memset(&drumvolume,-1,sizeof(drumvolume));
memset(&drumchorusdepth,-1,sizeof(drumchorusdepth));
memset(&drumreverberation,-1,sizeof(drumreverberation));
memset(&drumpanpot,NO_PANNING,sizeof(drumpanpot));
for (i=0; i<MAXCHAN; i++)
{
if (ISDRUMCHANNEL(i)) channel[i].kit = 127;
else channel[i].kit = 0;
channel[i].brightness = 64;
channel[i].harmoniccontent = 64;
channel[i].variationbank = 0;
channel[i].chorusdepth = 0;
channel[i].reverberation = 0;
channel[i].transpose = 0;
}
past_riff:
if ((SDL_RWread(rw,tmp,1,4) != 4) || (SDL_RWread(rw,&len,4,1) != 1))
{
/* if (ferror(fp))
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s", current_filename,
strerror(errno));
}
else*/
ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
"%s: Not a MIDI file!", current_filename);
return 0;
}
len=BE_LONG(len);
if (!memcmp(tmp, "RIFF", 4))
{
SDL_RWread(rw,tmp,1,12);
goto past_riff;
}
if (memcmp(tmp, "MThd", 4) || len < 6)
{
ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
"%s: Not a MIDI file!", current_filename);
return 0;
}
SDL_RWread(rw,&format, 2, 1);
SDL_RWread(rw,&tracks, 2, 1);
SDL_RWread(rw,&divisions_tmp, 2, 1);