summaryrefslogtreecommitdiffstats
path: root/libtdemid/track.cc
blob: c7c85891998fd64bb6f0eb19ed307e902c737d66 (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
/**************************************************************************

    track.cc  - class track, which has a midi file track and its events
    This file is part of LibKMid 0.9.5
    Copyright (C) 1997,98,99,2000  Antonio Larrosa Jimenez
    LibKMid's homepage : http://www.arrakis.es/~rlarrosa/libtdemid.html

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library 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
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.

    Send comments and bug fixes to Antonio Larrosa <larrosa@kde.org>

***************************************************************************/ 

#include "track.h"
#include <stdlib.h>
#include "sndcard.h"
#include "midispec.h"
#include "midfile.h"

#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif

#define T2MS(ticks) (((double)ticks)*(double)60000L)/((double)tempoToMetronomeTempo(tempo)*(double)tPCN)

#define MS2T(ms) (((ms)*(double)tempoToMetronomeTempo(tempo)*(double)tPCN)/((double)60000L))

#define PEDANTIC_TRACK
#define CHANGETEMPO_ONLY_IN_TRACK0
//#define TRACKDEBUG
//#define TRACKDEBUG2

MidiTrack::MidiTrack(FILE *file,int tpcn,int Id)
{
  id=Id;
  tPCN=tpcn;
  currentpos=0;
  size=0;
  data=0L;
  tempo=1000000;
  if (feof(file)) 
  {
    clear();
    return; 
  };
  size=readLong(file);
#ifdef TRACKDEBUG
  printf("Track %d : Size %ld\n",id,size);
#endif
  data=new uchar[size];
  if (data==NULL)
  {
    perror("track: Not enough memory ?");
    exit(-1);
  }
  ulong rsize=0;
  if ((rsize=fread(data,1,size,file))!=size)
  {
    fprintf(stderr,"track (%d): File is corrupt : Couldn't load track (%ld!=%ld) !!\n", id, rsize, size);
    size=rsize;
  };
  /*
     ptrdata=data;
     current_ticks=0;
     delta_ticks=readVariableLengthValue();
     wait_ticks=delta_ticks;
     endoftrack=0;
   */
  init();
}

MidiTrack::~MidiTrack()
{
  delete data;
  endoftrack=1;
  currentpos=0;
  size=0;
}

int MidiTrack::power2to(int i)
{
  return 1<<i;
}

ulong MidiTrack::readVariableLengthValue(void)
{
  ulong dticks=0;

  while ((*ptrdata) & 0x80)
  {
#ifdef PEDANTIC_TRACK
    if (currentpos>=size)
    {
      endoftrack=1;
      fprintf(stderr, "track (%d) : EndofTrack found by accident !\n",id);
      delta_ticks = wait_ticks = ~0;	
      time_at_next_event=10000 * 60000L;
      return 0;
    }
    else
#endif
    {
      dticks=(dticks << 7) | (*ptrdata) & 0x7F;
      ptrdata++;currentpos++;
    }

  }
  dticks=((dticks << 7) | (*ptrdata) & 0x7F);
  ptrdata++;currentpos++;

#ifdef PEDANTIC_TRACK

  if (currentpos>=size)
  {
    endoftrack=1;
    fprintf(stderr,"track (%d): EndofTrack found by accident 2 !\n",id);
    dticks=0;
    delta_ticks = wait_ticks = ~0;	
    time_at_next_event=10000 * 60000L;
    return 0;
  }
#endif
#ifdef TRACKDEBUG
  printfdebug("track(%d): DTICKS : %ld\n",id,dticks);
  usleep(10);
#endif
  return dticks;
}

int MidiTrack::ticksPassed (ulong ticks)
{
  if (endoftrack==1) return 0;
  if (ticks>wait_ticks) 
  {
    printfdebug("track (%d): ERROR : TICKS PASSED > WAIT TICKS\n", id);
    return 1;
  }
  wait_ticks-=ticks;
  return 0;
}

int MidiTrack::msPassed (ulong ms)
{
  if (endoftrack==1) return 0;
  current_time+=ms;
  //fprintf(stderr, "old + %ld = CURR %g  ", ms,current_time);
  if ( current_time>time_at_next_event )
  {
    fprintf(stderr, "track (%d): ERROR : MS PASSED > WAIT MS\n", id);
    return 1;
  }
#ifdef TRACKDEBUG
  if (current_time==time_at_next_event) printfdebug("track(%d): _OK_",id);
#endif
  return 0;
}

int MidiTrack::currentMs(double ms)
{
  if (endoftrack==1) return 0;
  current_time=ms;
  //printfdebug("CURR %g",current_time);
#ifdef PEDANTIC_TRACK
  if (current_time>time_at_next_event) 
  {
    fprintf(stderr,"track(%d): ERROR : MS PASSED > WAIT MS\n", id);
    exit(-1);
    return 1;
  }
#endif
  return 0;
}

void MidiTrack::readEvent(MidiEvent *ev)
{
  int i,j;
  if (endoftrack==1) 
  {
    ev->command=0;
    return;
  }
  /*
     printfdebug("...... %d\n",id);
     printfdebug("current : %g , tane : %g\n",current_time,time_at_next_event);
     printfdebug("......\n");
   */
  int skip_event=0;
  current_time=time_at_next_event;
  if (((*ptrdata)&0x80)!=0)
  {
    ev->command=(*ptrdata);
    ptrdata++;currentpos++;
    lastcommand=ev->command;
  }
  else
  {
    ev->command=lastcommand;
  }

#ifdef PEDANTIC_TRACK
  if (currentpos>=size)
  {
    endoftrack=1;
    delta_ticks = wait_ticks = ~0;	
    time_at_next_event=10000 * 60000L;
    ev->command=MIDI_SYSTEM_PREFIX;
    ev->chn=0xF;
    ev->d1=ME_END_OF_TRACK;
    fprintf(stderr, "track (%d): EndofTrack found by accident 3\n",id);
    return;
  }
#endif

  ev->chn=ev->command & 0xF;
  ev->command=ev->command & 0xF0;
  switch (ev->command)
  {
    case (MIDI_NOTEON) :
      ev->note = *ptrdata;ptrdata++;currentpos++;
      ev->vel  = *ptrdata;ptrdata++;currentpos++;
      if (ev->vel==0)
	note[ev->chn][ev->note]=FALSE;
      else
	note[ev->chn][ev->note]=TRUE;

#ifdef TRACKDEBUG2
      if (ev->chn==6) {
	if (ev->vel==0) printfdebug("Note Onf\n");
	else printfdebug("Note On\n");
      };
#endif
      break;
    case (MIDI_NOTEOFF) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug("Note Off\n");
#endif
      ev->note = *ptrdata;ptrdata++;currentpos++; 
      ev->vel  = *ptrdata;ptrdata++;currentpos++;
      note[ev->chn][ev->note]=FALSE;

      break;
    case (MIDI_KEY_PRESSURE) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug ("Key press\n");
#endif
      ev->note = *ptrdata;ptrdata++;currentpos++; 
      ev->vel  = *ptrdata;ptrdata++;currentpos++;
      break;
    case (MIDI_PGM_CHANGE) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug ("Pgm\n");
#endif
      ev->patch = *ptrdata;ptrdata++;currentpos++; 
      break;
    case (MIDI_CHN_PRESSURE) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug ("Chn press\n");
#endif
      ev->vel  = *ptrdata;ptrdata++;currentpos++;
      break;
    case (MIDI_PITCH_BEND) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug ("Pitch\n");
#endif
      ev->d1 = *ptrdata;ptrdata++;currentpos++; 
      ev->d2 = *ptrdata;ptrdata++;currentpos++;
      break;
    case (MIDI_CTL_CHANGE) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug (stderr, "Ctl\n");
#endif
      ev->ctl = *ptrdata;ptrdata++; currentpos++;
      ev->d1  = *ptrdata;ptrdata++;currentpos++;
      /*
	 switch (ev->ctl)
	 {
	 case (96) : printfdebug("RPN Increment\n");break;
	 case (97) : printfdebug("RPN Decrement\n");break;
	 case (98) : printfdebug("nRPN 98 %d\n",ev->d1);break;
	 case (99) : printfdebug("nRPN 99 %d\n",ev->d1);break;
	 case (100) : printfdebug("RPN 100 %d\n",ev->d1);break;
	 case (101) : printfdebug("RPN 101 %d\n",ev->d1);break;
	 };
       */
      break;

    case (MIDI_SYSTEM_PREFIX) :
#ifdef TRACKDEBUG2
      if (ev->chn==6) printfdebug ("Sys Prefix\n");
#endif
      switch ((ev->command|ev->chn))
      {
	case (0xF0) : 
	case (0xF7) :
	  ev->length=readVariableLengthValue();
#ifdef PEDANTIC_TRACK
	  if (endoftrack) 
	  {
	    ev->command=MIDI_SYSTEM_PREFIX;
	    ev->chn=0xF;
	    ev->d1=ME_END_OF_TRACK;
	  }
	  else
#endif
	  {
	    ev->data=ptrdata;
	    ptrdata+=ev->length;currentpos+=ev->length;
	  }
	  break;
	case (0xFE):
	case (0xF8):
	  //		printfdebug("Active sensing\n");
	  break;
	case (META_EVENT) : 
	  ev->d1=*ptrdata;ptrdata++;currentpos++;
	  switch (ev->d1)
	  {
	    case (ME_END_OF_TRACK) :
	      i=0;
	      j=0;
	      while ((i<16)&&(note[i][j]==FALSE))
	      {
		j++;
		if (j==128) { j=0; i++; };
	      }
	      if (i<16) // that is, if there is any key still pressed
	      {
		ptrdata--;currentpos--;
		ev->chn=i;
		ev->command=MIDI_NOTEOFF;
		ev->note = j;
		ev->vel  = 0;
		note[ev->chn][ev->note]=FALSE;
		fprintf(stderr,"Note Off(simulated)\n");
		return;
	      }
	      else
	      {
		endoftrack=1;
		delta_ticks = wait_ticks = ~0;
		time_at_next_event=10000 * 60000L;
#ifdef TRACKDEBUG
		printfdebug("EndofTrack %d event\n",id);
#endif
	      }
	      break;
	    case (ME_SET_TEMPO):
	      ev->length=readVariableLengthValue();
#ifdef PEDANTIC_TRACK
	      if (endoftrack) 
	      {
		ev->command=MIDI_SYSTEM_PREFIX;
		ev->chn=0xF;
		ev->d1=ME_END_OF_TRACK;
	      }
	      else
#endif
	      {
		ev->data=ptrdata;
		ptrdata+=ev->length;currentpos+=ev->length;
		//  tempo=((ev->data[0]<<16)|(ev->data[1]<<8)|(ev->data[2]));
		//  ticks_from_previous_tempochange=0;
		// 	time_at_previous_tempochange=current_time;
#ifdef TRACKDEBUG
		printfdebug("Track %d : Set Tempo : %ld\n",id,tempo);
#endif
#ifdef CHANGETEMPO_ONLY_IN_TRACK0
		if (id!=0) skip_event=1;
#endif
	      }
	      break;
	    case (ME_TIME_SIGNATURE) :
	      ev->length=*ptrdata;ptrdata++;currentpos++;
	      ev->d2=*ptrdata;ptrdata++;currentpos++;
	      ev->d3=power2to(*ptrdata);ptrdata++;currentpos++;
	      ev->d4=*ptrdata;ptrdata++;currentpos++;
	      ev->d5=*ptrdata;ptrdata++;currentpos++;
#ifdef TRACKDEBUG
	      printfdebug("TIME SIGNATURE :\n");	
	      printfdebug("%d\n",ev->d2);
	      printfdebug("----  %d metronome , %d number of 32nd notes per quarter note\n",ev->d4,ev->d5);
	      printfdebug("%d\n",ev->d3);
#endif
	      break;
	    case (ME_TRACK_SEQ_NUMBER) :
	    case (ME_TEXT) :
	    case (ME_COPYRIGHT) :
	    case (ME_SEQ_OR_TRACK_NAME) :
	    case (ME_TRACK_INSTR_NAME) :
	    case (ME_LYRIC) :
	    case (ME_MARKER) :
	    case (ME_CUE_POINT) :
	    case (ME_CHANNEL_PREFIX) :
	    case (ME_MIDI_PORT) :
	    case (ME_SMPTE_OFFSET) :
	    case (ME_KEY_SIGNATURE) :
	      ev->length=readVariableLengthValue();
#ifdef PEDANTIC_TRACK
	      if (endoftrack) 
	      {
		ev->command=MIDI_SYSTEM_PREFIX;
		ev->chn=0xF;
		ev->d1=ME_END_OF_TRACK;
	      }
	      else
#endif
	      {
		ev->data=ptrdata;
		ptrdata+=ev->length;currentpos+=ev->length;
	      }
	      break;
	    default: 
#ifdef GENERAL_DEBUG_MESSAGES
	      fprintf(stderr,"track (%d) : Default handler for meta event " \
		  "0x%x\n", id, ev->d1);
#endif
	      ev->length=readVariableLengthValue();
#ifdef PEDANTIC_TRACK
	      if (endoftrack) 
	      {
		ev->command=MIDI_SYSTEM_PREFIX;
		ev->chn=0xF;
		ev->d1=ME_END_OF_TRACK;
	      }
	      else
#endif
	      {
		ev->data=ptrdata;
		ptrdata+=ev->length;currentpos+=ev->length;
	      }
	      break;
	  }
	  break;
	default : 
	  fprintf(stderr,"track (%d): Default handler for system event 0x%x\n",
	      id, (ev->command|ev->chn));
	  break;
      }
      break;
    default : 
      fprintf(stderr,"track (%d): Default handler for event 0x%x\n",
	  id, (ev->command|ev->chn));
      break;
  }
#ifdef PEDANTIC_TRACK
  if (currentpos>=size)
  {
    endoftrack=1;
    delta_ticks = wait_ticks = ~0;	
    time_at_next_event=10000 * 60000L;
    printfdebug("track (%d): EndofTrack reached\n",id);
  }
#endif
  if (endoftrack==0)
  {
    current_ticks+=delta_ticks;
    delta_ticks=readVariableLengthValue();
#ifdef PEDANTIC_TRACK
    if (endoftrack) 
    {
      ev->command=MIDI_SYSTEM_PREFIX;
      ev->chn=0xF;
      ev->d1=ME_END_OF_TRACK;
      return;
    }
#endif
    ticks_from_previous_tempochange+=delta_ticks;

    time_at_next_event=T2MS(ticks_from_previous_tempochange)+time_at_previous_tempochange;
    /*
       printf("tane2 : %g, ticks : %g, delta_ticks %ld, tempo : %ld\n",
       time_at_next_event,ticks_from_previous_tempochange,delta_ticks,tempo);
       printf("timeatprevtc %g , curr %g\n",time_at_previous_tempochange,current_time);
     */
    wait_ticks=delta_ticks;

  }
  if (skip_event) readEvent(ev);
}


void MidiTrack::clear(void)
{
  endoftrack=1;
  ptrdata=data;
  current_ticks=0;
  currentpos=0;

  for (int i=0;i<16;i++)
    for (int j=0;j<128;j++)
      note[i][j]=FALSE;

  delta_ticks = wait_ticks = ~0;	
  time_at_previous_tempochange=0;
  current_time=0;
  ticks_from_previous_tempochange=0;
  tempo=1000000;
  time_at_next_event=10000 * 60000L;

}


void MidiTrack::init(void)
{
  if (data==0L) { clear(); return; };
  endoftrack=0;
  ptrdata=data;
  current_ticks=0;
  currentpos=0;

  for (int i=0;i<16;i++)
    for (int j=0;j<128;j++)
      note[i][j]=FALSE;

  delta_ticks=readVariableLengthValue();
  if (endoftrack) return;
  wait_ticks=delta_ticks;


  time_at_previous_tempochange=0;
  current_time=0;
  ticks_from_previous_tempochange=wait_ticks;
  tempo=1000000;
  time_at_next_event=T2MS(delta_ticks);
  //printf("tane1 : %g\n",time_at_next_event);
}

void MidiTrack::changeTempo(ulong t)
{
  if (endoftrack==1) return;
  if (tempo==t) return;
  double ticks;
  time_at_previous_tempochange=current_time;
  ticks=MS2T(time_at_next_event-current_time);
  tempo=t;
  time_at_next_event=T2MS(ticks)+current_time;
  ticks_from_previous_tempochange=ticks;

}

/*
double MidiTrack::absMsOfNextEvent (void) 
{
  //printf("%d : %g\n",id,time_at_next_event);
  return time_at_next_event;
}
*/

#undef T2MS
#undef MS2T