Package list libsdl2-mixer / debian/2.0.2+dfsg1-1 timidity / playmidi.c
debian/2.0.2+dfsg1-1

Tree @debian/2.0.2+dfsg1-1 (Download .tar.gz)

playmidi.c @debian/2.0.2+dfsg1-1raw · history · blame

  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
/*

    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.

    playmidi.c -- random stuff in need of rearrangement

*/

#if HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"

#include "timidity.h"
#include "options.h"
#include "instrum.h"
#include "playmidi.h"
#include "output.h"
#include "mix.h"
#include "tables.h"

static void adjust_amplification(MidiSong *song)
{ 
  song->master_volume = (float)(song->amplification) / (float)100.0;
}

static void reset_voices(MidiSong *song)
{
  int i;
  for (i=0; i<MAX_VOICES; i++)
    song->voice[i].status=VOICE_FREE;
}

/* Process the Reset All Controllers event */
static void reset_controllers(MidiSong *song, int c)
{
  song->channel[c].volume=90; /* Some standard says, although the SCC docs say 0. */
  song->channel[c].expression=127; /* SCC-1 does this. */
  song->channel[c].sustain=0;
  song->channel[c].pitchbend=0x2000;
  song->channel[c].pitchfactor=0; /* to be computed */
}

static void reset_midi(MidiSong *song)
{
  int i;
  for (i=0; i<MAXCHAN; i++)
    {
      reset_controllers(song, i);
      /* The rest of these are unaffected by the Reset All Controllers event */
      song->channel[i].program=song->default_program;
      song->channel[i].panning=NO_PANNING;
      song->channel[i].pitchsens=2;
      song->channel[i].bank=0; /* tone bank or drum set */
    }
  reset_voices(song);
}

static void select_sample(MidiSong *song, int v, Instrument *ip, int vel)
{
  Sint32 f, cdiff, diff;
  int s,i;
  Sample *sp, *closest;

  s=ip->samples;
  sp=ip->sample;

  if (s==1)
    {
      song->voice[v].sample=sp;
      return;
    }

  f=song->voice[v].orig_frequency;
  for (i=0; i<s; i++)
    {
      if (sp->low_freq <= f && sp->high_freq >= f)
	{
	  song->voice[v].sample=sp;
	  return;
	}
      sp++;
    }

  /* 
     No suitable sample found! We'll select the sample whose root
     frequency is closest to the one we want. (Actually we should
     probably convert the low, high, and root frequencies to MIDI note
     values and compare those.) */

  cdiff=0x7FFFFFFF;
  closest=sp=ip->sample;
  for(i=0; i<s; i++)
    {
      diff=sp->root_freq - f;
      if (diff<0) diff=-diff;
      if (diff<cdiff)
	{
	  cdiff=diff;
	  closest=sp;
	}
      sp++;
    }
  song->voice[v].sample=closest;
  return;
}

static void recompute_freq(MidiSong *song, int v)
{
  int 
    sign=(song->voice[v].sample_increment < 0), /* for bidirectional loops */
    pb=song->channel[song->voice[v].channel].pitchbend;
  double a;
  
  if (!song->voice[v].sample->sample_rate)
    return;

  if (song->voice[v].vibrato_control_ratio)
    {
      /* This instrument has vibrato. Invalidate any precomputed
         sample_increments. */

      int i=VIBRATO_SAMPLE_INCREMENTS;
      while (i--)
	song->voice[v].vibrato_sample_increment[i]=0;
    }

  if (pb==0x2000 || pb<0 || pb>0x3FFF)
    song->voice[v].frequency = song->voice[v].orig_frequency;
  else
    {
      pb-=0x2000;
      if (!(song->channel[song->voice[v].channel].pitchfactor))
	{
	  /* Damn. Somebody bent the pitch. */
	  Sint32 i=pb*song->channel[song->voice[v].channel].pitchsens;
	  if (pb<0)
	    i=-i;
	  song->channel[song->voice[v].channel].pitchfactor=
	    (float)(bend_fine[(i>>5) & 0xFF] * bend_coarse[i>>13]);
	}
      if (pb>0)
	song->voice[v].frequency=
	  (Sint32)(song->channel[song->voice[v].channel].pitchfactor *
		  (double)(song->voice[v].orig_frequency));
      else
	song->voice[v].frequency=
	  (Sint32)((double)(song->voice[v].orig_frequency) /
		  song->channel[song->voice[v].channel].pitchfactor);
    }

  a = FSCALE(((double)(song->voice[v].sample->sample_rate) *
	      (double)(song->voice[v].frequency)) /
	     ((double)(song->voice[v].sample->root_freq) *
	      (double)(song->rate)),
	     FRACTION_BITS);

  if (sign) 
    a = -a; /* need to preserve the loop direction */

  song->voice[v].sample_increment = (Sint32)(a);
}

static void recompute_amp(MidiSong *song, int v)
{
  Sint32 tempamp;

  /* TODO: use fscale */

  tempamp= (song->voice[v].velocity *
	    song->channel[song->voice[v].channel].volume * 
	    song->channel[song->voice[v].channel].expression); /* 21 bits */

  if (!(song->encoding & PE_MONO))
    {
      if (song->voice[v].panning > 60 && song->voice[v].panning < 68)
	{
	  song->voice[v].panned=PANNED_CENTER;

	  song->voice[v].left_amp=
	    FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
		      21);
	}
      else if (song->voice[v].panning<5)
	{
	  song->voice[v].panned = PANNED_LEFT;

	  song->voice[v].left_amp=
	    FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
		      20);
	}
      else if (song->voice[v].panning>123)
	{
	  song->voice[v].panned = PANNED_RIGHT;

	  song->voice[v].left_amp= /* left_amp will be used */
	    FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
		      20);
	}
      else
	{
	  song->voice[v].panned = PANNED_MYSTERY;

	  song->voice[v].left_amp=
	    FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
		      27);
	  song->voice[v].right_amp = song->voice[v].left_amp * (song->voice[v].panning);
	  song->voice[v].left_amp *= (float)(127 - song->voice[v].panning);
	}
    }
  else
    {
      song->voice[v].panned = PANNED_CENTER;

      song->voice[v].left_amp=
	FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume,
		  21);
    }
}

static void start_note(MidiSong *song, MidiEvent *e, int i)
{
  Instrument *ip;
  int j;

  if (ISDRUMCHANNEL(song, e->channel))
    {
      if (!(ip=song->drumset[song->channel[e->channel].bank]->instrument[e->a]))
	{
	  if (!(ip=song->drumset[0]->instrument[e->a]))
	    return; /* No instrument? Then we can't play. */
	}
      if (ip->samples != 1)
	{
	  SNDDBG(("Strange: percussion instrument with %d samples!",
		  ip->samples));
	}

      if (ip->sample->note_to_use) /* Do we have a fixed pitch? */
	song->voice[i].orig_frequency = freq_table[(int)(ip->sample->note_to_use)];
      else
	song->voice[i].orig_frequency = freq_table[e->a & 0x7F];
      
      /* drums are supposed to have only one sample */
      song->voice[i].sample = ip->sample;
    }
  else
    {
      if (song->channel[e->channel].program == SPECIAL_PROGRAM)
	ip=song->default_instrument;
      else if (!(ip=song->tonebank[song->channel[e->channel].bank]->
		 instrument[song->channel[e->channel].program]))
	{
	  if (!(ip=song->tonebank[0]->instrument[song->channel[e->channel].program]))
	    return; /* No instrument? Then we can't play. */
	}

      if (ip->sample->note_to_use) /* Fixed-pitch instrument? */
	song->voice[i].orig_frequency = freq_table[(int)(ip->sample->note_to_use)];
      else
	song->voice[i].orig_frequency = freq_table[e->a & 0x7F];
      select_sample(song, i, ip, e->b);
    }

  song->voice[i].status = VOICE_ON;
  song->voice[i].channel = e->channel;
  song->voice[i].note = e->a;
  song->voice[i].velocity = e->b;
  song->voice[i].sample_offset = 0;
  song->voice[i].sample_increment = 0; /* make sure it isn't negative */

  song->voice[i].tremolo_phase = 0;
  song->voice[i].tremolo_phase_increment = song->voice[i].sample->tremolo_phase_increment;
  song->voice[i].tremolo_sweep = song->voice[i].sample->tremolo_sweep_increment;
  song->voice[i].tremolo_sweep_position = 0;

  song->voice[i].vibrato_sweep = song->voice[i].sample->vibrato_sweep_increment;
  song->voice[i].vibrato_sweep_position = 0;
  song->voice[i].vibrato_control_ratio = song->voice[i].sample->vibrato_control_ratio;
  song->voice[i].vibrato_control_counter = song->voice[i].vibrato_phase = 0;
  for (j=0; j<VIBRATO_SAMPLE_INCREMENTS; j++)
    song->voice[i].vibrato_sample_increment[j] = 0;

  if (song->channel[e->channel].panning != NO_PANNING)
    song->voice[i].panning = song->channel[e->channel].panning;
  else
    song->voice[i].panning = song->voice[i].sample->panning;

  recompute_freq(song, i);
  recompute_amp(song, i);
  if (song->voice[i].sample->modes & MODES_ENVELOPE)
    {
      /* Ramp up from 0 */
      song->voice[i].envelope_stage = 0;
      song->voice[i].envelope_volume = 0;
      song->voice[i].control_counter = 0;
      recompute_envelope(song, i);
      apply_envelope_to_amp(song, i);
    }
  else
    {
      song->voice[i].envelope_increment = 0;
      apply_envelope_to_amp(song, i);
    }
}

static void kill_note(MidiSong *song, int i)
{
  song->voice[i].status = VOICE_DIE;
}

/* Only one instance of a note can be playing on a single channel. */
static void note_on(MidiSong *song)
{
  int i = song->voices, lowest=-1; 
  Sint32 lv=0x7FFFFFFF, v;
  MidiEvent *e = song->current_event;

  while (i--)
    {
      if (song->voice[i].status == VOICE_FREE)
	lowest=i; /* Can't get a lower volume than silence */
      else if (song->voice[i].channel==e->channel && 
	       (song->voice[i].note==e->a || song->channel[song->voice[i].channel].mono))
	kill_note(song, i);
    }

  if (lowest != -1)
    {
      /* Found a free voice. */
      start_note(song,e,lowest);
      return;
    }
  
  /* Look for the decaying note with the lowest volume */
  i = song->voices;
  while (i--)
    {
      if ((song->voice[i].status != VOICE_ON) &&
	  (song->voice[i].status != VOICE_DIE))
	{
	  v = song->voice[i].left_mix;
	  if ((song->voice[i].panned == PANNED_MYSTERY)
	      && (song->voice[i].right_mix > v))
	    v = song->voice[i].right_mix;
	  if (v<lv)
	    {
	      lv=v;
	      lowest=i;
	    }
	}
    }

  if (lowest != -1)
    {
      /* This can still cause a click, but if we had a free voice to
	 spare for ramping down this note, we wouldn't need to kill it
	 in the first place... Still, this needs to be fixed. Perhaps
	 we could use a reserve of voices to play dying notes only. */
      
      song->cut_notes++;
      song->voice[lowest].status=VOICE_FREE;
      start_note(song,e,lowest);
    }
  else
    song->lost_notes++;
}

static void finish_note(MidiSong *song, int i)
{
  if (song->voice[i].sample->modes & MODES_ENVELOPE)
    {
      /* We need to get the envelope out of Sustain stage */
      song->voice[i].envelope_stage = 3;
      song->voice[i].status = VOICE_OFF;
      recompute_envelope(song, i);
      apply_envelope_to_amp(song, i);
    }
  else
    {
      /* Set status to OFF so resample_voice() will let this voice out
         of its loop, if any. In any case, this voice dies when it
         hits the end of its data (ofs>=data_length). */
      song->voice[i].status = VOICE_OFF;
    }
}

static void note_off(MidiSong *song)
{
  int i = song->voices;
  MidiEvent *e = song->current_event;

  while (i--)
    if (song->voice[i].status == VOICE_ON &&
	song->voice[i].channel == e->channel &&
	song->voice[i].note == e->a)
      {
	if (song->channel[e->channel].sustain)
	  {
	    song->voice[i].status = VOICE_SUSTAINED;
	  }
	else
	  finish_note(song, i);
	return;
      }
}

/* Process the All Notes Off event */
static void all_notes_off(MidiSong *song)
{
  int i = song->voices;
  int c = song->current_event->channel;

  SNDDBG(("All notes off on channel %d", c));
  while (i--)
    if (song->voice[i].status == VOICE_ON &&
	song->voice[i].channel == c)
      {
	if (song->channel[c].sustain) 
	  song->voice[i].status = VOICE_SUSTAINED;
	else
	  finish_note(song, i);
      }
}

/* Process the All Sounds Off event */
static void all_sounds_off(MidiSong *song)
{
  int i = song->voices;
  int c = song->current_event->channel;

  while (i--)
    if (song->voice[i].channel == c && 
	song->voice[i].status != VOICE_FREE &&
	song->voice[i].status != VOICE_DIE)
      {
	kill_note(song, i);
      }
}

static void adjust_pressure(MidiSong *song)
{
  MidiEvent *e = song->current_event;
  int i = song->voices;
  
  while (i--)
    if (song->voice[i].status == VOICE_ON &&
	song->voice[i].channel == e->channel &&
	song->voice[i].note == e->a)
      {
	song->voice[i].velocity = e->b;
	recompute_amp(song, i);
	apply_envelope_to_amp(song, i);
	return;
      }
}

static void drop_sustain(MidiSong *song)
{
  int i = song->voices;
  int c = song->current_event->channel;

  while (i--)
    if (song->voice[i].status == VOICE_SUSTAINED && song->voice[i].channel == c)
      finish_note(song, i);
}

static void adjust_pitchbend(MidiSong *song)
{
  int c = song->current_event->channel;
  int i = song->voices;
  
  while (i--)
    if (song->voice[i].status != VOICE_FREE && song->voice[i].channel == c)
      {
	recompute_freq(song, i);
      }
}

static void adjust_volume(MidiSong *song)
{
  int c = song->current_event->channel;
  int i = song->voices;

  while (i--)
    if (song->voice[i].channel == c &&
	(song->voice[i].status==VOICE_ON || song->voice[i].status==VOICE_SUSTAINED))
      {
	recompute_amp(song, i);
	apply_envelope_to_amp(song, i);
      }
}

static void seek_forward(MidiSong *song, Sint32 until_time)
{
  reset_voices(song);
  while (song->current_event->time < until_time)
    {
      switch(song->current_event->type)
	{
	  /* All notes stay off. Just handle the parameter changes. */

	case ME_PITCH_SENS:
	  song->channel[song->current_event->channel].pitchsens =
	    song->current_event->a;
	  song->channel[song->current_event->channel].pitchfactor = 0;
	  break;
	  
	case ME_PITCHWHEEL:
	  song->channel[song->current_event->channel].pitchbend =
	    song->current_event->a + song->current_event->b * 128;
	  song->channel[song->current_event->channel].pitchfactor = 0;
	  break;
	  
	case ME_MAINVOLUME:
	  song->channel[song->current_event->channel].volume =
	    song->current_event->a;
	  break;
	  
	case ME_PAN:
	  song->channel[song->current_event->channel].panning =
	    song->current_event->a;
	  break;
	      
	case ME_EXPRESSION:
	  song->channel[song->current_event->channel].expression =
	    song->current_event->a;
	  break;
	  
	case ME_PROGRAM:
	  if (ISDRUMCHANNEL(song, song->current_event->channel))
	    /* Change drum set */
	    song->channel[song->current_event->channel].bank =
	      song->current_event->a;
	  else
	    song->channel[song->current_event->channel].program =
	      song->current_event->a;
	  break;

	case ME_SUSTAIN:
	  song->channel[song->current_event->channel].sustain =
	    song->current_event->a;
	  break;

	case ME_RESET_CONTROLLERS:
	  reset_controllers(song, song->current_event->channel);
	  break;
	      
	case ME_TONE_BANK:
	  song->channel[song->current_event->channel].bank =
	    song->current_event->a;
	  break;
	  
	case ME_EOT:
	  song->current_sample = song->current_event->time;
	  return;
	}
      song->current_event++;
    }
  /*song->current_sample=song->current_event->time;*/
  if (song->current_event != song->events)
    song->current_event--;
  song->current_sample=until_time;
}

static void skip_to(MidiSong *song, Sint32 until_time)
{
  if (song->current_sample > until_time)
    song->current_sample = 0;

  reset_midi(song);
  song->buffered_count = 0;
  song->buffer_pointer = song->common_buffer;
  song->current_event = song->events;
  
  if (until_time)
    seek_forward(song, until_time);
}

static void do_compute_data(MidiSong *song, Sint32 count)
{
  int i;
  memset(song->buffer_pointer, 0, 
	 (song->encoding & PE_MONO) ? (count * 4) : (count * 8));
  for (i = 0; i < song->voices; i++)
    {
      if(song->voice[i].status != VOICE_FREE)
	mix_voice(song, song->buffer_pointer, i, count);
    }
  song->current_sample += count;
}

/* count=0 means flush remaining buffered data to output device, then
   flush the device itself */
static void compute_data(MidiSong *song, void *stream, Sint32 count)
{
  int channels;

  if ( song->encoding & PE_MONO )
    channels = 1;
  else
    channels = 2;

  if (!count)
    {
      if (song->buffered_count)
          song->write(stream, song->common_buffer, channels * song->buffered_count);
      song->buffer_pointer = song->common_buffer;
      song->buffered_count = 0;
      return;
    }

  while ((count + song->buffered_count) >= song->buffer_size)
    {
      do_compute_data(song, song->buffer_size - song->buffered_count);
      count -= song->buffer_size - song->buffered_count;
      song->write(stream, song->common_buffer, channels * song->buffer_size);
      song->buffer_pointer = song->common_buffer;
      song->buffered_count = 0;
    }
  if (count>0)
    {
      do_compute_data(song, count);
      song->buffered_count += count;
      song->buffer_pointer += (song->encoding & PE_MONO) ? count : count*2;
    }
}

void Timidity_Start(MidiSong *song)
{
  song->playing = 1;
  adjust_amplification(song);
  skip_to(song, 0);
}

void Timidity_Seek(MidiSong *song, Uint32 ms)
{
    skip_to(song, (ms * song->rate) / 1000);
}

Uint32 Timidity_GetSongLength(MidiSong *song)
{
  MidiEvent *last_event = &song->events[song->groomed_event_count - 1];
  /* We want last_event->time * 1000 / song->rate */
  Uint32 retvalue = (last_event->time / song->rate) * 1000;
  retvalue       += (last_event->time % song->rate) * 1000 / song->rate;
  return retvalue;
}

int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len)
{
  Sint32 start_sample, end_sample, samples;
  int bytes_per_sample;

  if (!song->playing)
    return 0;
  
  bytes_per_sample = 1;
  bytes_per_sample *= ((song->encoding & PE_32BIT) ? 4 : ((song->encoding & PE_16BIT) ? 2 : 1));
  bytes_per_sample *= ((song->encoding & PE_MONO) ? 1 : 2);
  samples = len / bytes_per_sample;
  
  start_sample = song->current_sample;
  end_sample = song->current_sample+samples;
  while ( song->current_sample < end_sample ) {
    /* Handle all events that should happen at this time */
    while (song->current_event->time <= song->current_sample) {
      switch(song->current_event->type) {

        /* Effects affecting a single note */

        case ME_NOTEON:
          if (!(song->current_event->b)) /* Velocity 0? */
            note_off(song);
          else
            note_on(song);
          break;
  
        case ME_NOTEOFF:
          note_off(song);
          break;
  
        case ME_KEYPRESSURE:
          adjust_pressure(song);
          break;
  
          /* Effects affecting a single channel */
  
        case ME_PITCH_SENS:
          song->channel[song->current_event->channel].pitchsens =
	    song->current_event->a;
          song->channel[song->current_event->channel].pitchfactor = 0;
          break;
          
        case ME_PITCHWHEEL:
          song->channel[song->current_event->channel].pitchbend =
            song->current_event->a + song->current_event->b * 128;
          song->channel[song->current_event->channel].pitchfactor = 0;
          /* Adjust pitch for notes already playing */
          adjust_pitchbend(song);
          break;
          
        case ME_MAINVOLUME:
          song->channel[song->current_event->channel].volume =
	    song->current_event->a;
          adjust_volume(song);
          break;
          
        case ME_PAN:
          song->channel[song->current_event->channel].panning =
	    song->current_event->a;
          break;
          
        case ME_EXPRESSION:
          song->channel[song->current_event->channel].expression =
	    song->current_event->a;
          adjust_volume(song);
          break;
  
        case ME_PROGRAM:
          if (ISDRUMCHANNEL(song, song->current_event->channel)) {
            /* Change drum set */
            song->channel[song->current_event->channel].bank =
	      song->current_event->a;
          }
          else
            song->channel[song->current_event->channel].program =
	      song->current_event->a;
          break;
  
        case ME_SUSTAIN:
          song->channel[song->current_event->channel].sustain =
	    song->current_event->a;
          if (!song->current_event->a)
            drop_sustain(song);
          break;
          
        case ME_RESET_CONTROLLERS:
          reset_controllers(song, song->current_event->channel);
          break;
  
        case ME_ALL_NOTES_OFF:
          all_notes_off(song);
          break;
          
        case ME_ALL_SOUNDS_OFF:
          all_sounds_off(song);
          break;
          
        case ME_TONE_BANK:
          song->channel[song->current_event->channel].bank =
	    song->current_event->a;
          break;
  
        case ME_EOT:
          /* Give the last notes a couple of seconds to decay  */
          SNDDBG(("Playing time: ~%d seconds\n",
		  song->current_sample/song->rate+2));
          SNDDBG(("Notes cut: %d\n", song->cut_notes));
          SNDDBG(("Notes lost totally: %d\n", song->lost_notes));
	  song->playing = 0;
          return (song->current_sample - start_sample) * bytes_per_sample;
        }
      song->current_event++;
    }
    if (song->current_event->time > end_sample)
      compute_data(song, stream, end_sample-song->current_sample);
    else
      compute_data(song, stream, song->current_event->time-song->current_sample);
  }
  return samples * bytes_per_sample;
}

void Timidity_SetVolume(MidiSong *song, int volume)
{
  int i;
  if (volume > MAX_AMPLIFICATION)
    song->amplification = MAX_AMPLIFICATION;
  else
  if (volume < 0)
    song->amplification = 0;
  else
    song->amplification = volume;
  adjust_amplification(song);
  for (i = 0; i < song->voices; i++)
    if (song->voice[i].status != VOICE_FREE)
      {
        recompute_amp(song, i);
        apply_envelope_to_amp(song, i);
      }
}