Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo

Close

[d4435e]: examples / less_trivial_synth.c Maximize Restore History

Download this file

less_trivial_synth.c    535 lines (456 with data), 14.1 kB

  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
/* -*- c-basic-offset: 4 -*- vi:set ts=8 sts=4 sw=4: */
/* less_trivial_synth.c
Disposable Hosted Soft Synth API
Constructed by Chris Cannam, Steve Harris and Sean Bolton
This is an example DSSI synth plugin written by Steve Harris.
This example file is in the public domain.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
#include <stdio.h>
#include "dssi.h"
#include "ladspa.h"
#include "saw.h"
#define LTS_OUTPUT 0
#define LTS_FREQ 1
#define LTS_ATTACK 2
#define LTS_DECAY 3
#define LTS_SUSTAIN 4
#define LTS_RELEASE 5
#define LTS_TIMBRE 6
#define LTS_COUNT 7 /* must be 1 + highest value above */
#define POLYPHONY 74
#define MIDI_NOTES 128
#define STEP_SIZE 16
#define GLOBAL_GAIN 0.25f
#define TABLE_MODULUS 1024
#define TABLE_SIZE (TABLE_MODULUS + 1)
#define TABLE_MASK (TABLE_MODULUS - 1)
#define FP_IN(x) (x.part.in & TABLE_MASK)
#define FP_FR(x) ((float)x.part.fr * 0.0000152587890625f)
#define FP_OMEGA(w) ((double)TABLE_MODULUS * 65536.0 * (w));
#define LERP(f,a,b) ((a) + (f) * ((b) - (a)))
long int lrintf (float x);
static LADSPA_Descriptor *ltsLDescriptor = NULL;
static DSSI_Descriptor *ltsDDescriptor = NULL;
float *table[2];
typedef enum {
inactive = 0,
attack,
decay,
sustain,
release
} state_t;
typedef union {
uint32_t all;
struct {
#ifdef WORDS_BIGENDIAN
uint16_t in;
uint16_t fr;
#else
uint16_t fr;
uint16_t in;
#endif
} part;
} fixp;
typedef struct {
state_t state;
int note;
float amp;
float env;
float env_d;
fixp phase;
int counter;
int next_event;
} voice_data;
typedef struct {
LADSPA_Data tune;
LADSPA_Data attack;
LADSPA_Data decay;
LADSPA_Data sustain;
LADSPA_Data release;
LADSPA_Data timbre;
LADSPA_Data pitch;
} synth_vals;
typedef struct {
LADSPA_Data *output;
LADSPA_Data *tune;
LADSPA_Data *attack;
LADSPA_Data *decay;
LADSPA_Data *sustain;
LADSPA_Data *release;
LADSPA_Data *timbre;
LADSPA_Data pitch;
voice_data data[POLYPHONY];
int note2voice[MIDI_NOTES];
fixp omega[MIDI_NOTES];
float fs;
} LTS;
static void runLTS(LADSPA_Handle instance, unsigned long sample_count,
snd_seq_event_t * events, unsigned long EventCount);
static void run_voice(LTS *p, synth_vals *vals, voice_data *d,
LADSPA_Data *out, unsigned int count);
int pick_voice(const voice_data *data);
const LADSPA_Descriptor *ladspa_descriptor(unsigned long index)
{
switch (index) {
case 0:
return ltsLDescriptor;
default:
return NULL;
}
}
const DSSI_Descriptor *dssi_descriptor(unsigned long index)
{
switch (index) {
case 0:
return ltsDDescriptor;
default:
return NULL;
}
}
static void cleanupLTS(LADSPA_Handle instance)
{
free(instance);
}
static void connectPortLTS(LADSPA_Handle instance, unsigned long port,
LADSPA_Data * data)
{
LTS *plugin;
plugin = (LTS *) instance;
switch (port) {
case LTS_OUTPUT:
plugin->output = data;
break;
case LTS_FREQ:
plugin->tune = data;
break;
case LTS_ATTACK:
plugin->attack = data;
break;
case LTS_DECAY:
plugin->decay = data;
break;
case LTS_SUSTAIN:
plugin->sustain = data;
break;
case LTS_RELEASE:
plugin->release = data;
break;
case LTS_TIMBRE:
plugin->timbre = data;
break;
}
}
static LADSPA_Handle instantiateLTS(const LADSPA_Descriptor * descriptor,
unsigned long s_rate)
{
unsigned int i;
LTS *plugin_data = (LTS *) malloc(sizeof(LTS));
plugin_data->fs = s_rate;
for (i=0; i<MIDI_NOTES; i++) {
plugin_data->omega[i].all =
FP_OMEGA(pow(2.0, (i-69.0) / 12.0) / (double)s_rate);
}
return (LADSPA_Handle) plugin_data;
}
static void activateLTS(LADSPA_Handle instance)
{
LTS *plugin_data = (LTS *) instance;
unsigned int i;
for (i=0; i<POLYPHONY; i++) {
plugin_data->data[i].state = inactive;
}
for (i=0; i<MIDI_NOTES; i++) {
plugin_data->note2voice[i] = 0;
}
plugin_data->pitch = 1.0f;
}
static void runLTSWrapper(LADSPA_Handle instance,
unsigned long sample_count)
{
runLTS(instance, sample_count, NULL, 0);
}
static void runLTS(LADSPA_Handle instance, unsigned long sample_count,
snd_seq_event_t *events, unsigned long event_count)
{
LTS *plugin_data = (LTS *) instance;
LADSPA_Data *const output = plugin_data->output;
synth_vals vals;
voice_data *data = plugin_data->data;
unsigned long i;
unsigned long pos;
unsigned long count;
unsigned long event_pos;
unsigned long voice;
vals.tune = *(plugin_data->tune);
vals.attack = *(plugin_data->attack) * plugin_data->fs;
vals.decay = *(plugin_data->decay) * plugin_data->fs;
vals.sustain = *(plugin_data->sustain) * 0.01f;
vals.release = *(plugin_data->release) * plugin_data->fs;
vals.pitch = plugin_data->pitch;
for (pos = 0, event_pos = 0; pos < sample_count; pos += STEP_SIZE) {
vals.timbre = LERP(0.99f, vals.timbre, *(plugin_data->timbre));
while (event_pos < event_count
&& pos >= events[event_pos].time.tick) {
if (events[event_pos].type == SND_SEQ_EVENT_NOTEON) {
snd_seq_ev_note_t n = events[event_pos].data.note;
if (n.velocity > 0) {
const int voice = pick_voice(data);
plugin_data->note2voice[n.note] = voice;
data[voice].note = n.note;
data[voice].amp = sqrtf(n.velocity * .0078740157f) *
GLOBAL_GAIN;
data[voice].state = attack;
data[voice].env = 0.0;
data[voice].env_d = 1.0f / vals.attack;
data[voice].phase.all = 0;
data[voice].counter = 0;
data[voice].next_event = vals.attack;
} else {
const int voice = plugin_data->note2voice[n.note];
data[voice].state = release;
data[voice].env_d = -vals.sustain / vals.release;
data[voice].counter = 0;
data[voice].next_event = vals.release;
}
} else if (events[event_pos].type == SND_SEQ_EVENT_NOTEOFF) {
snd_seq_ev_note_t n = events[event_pos].data.note;
const int voice = plugin_data->note2voice[n.note];
if (data[voice].state != inactive) {
data[voice].state = release;
data[voice].env_d = -data[voice].env / vals.release;
data[voice].counter = 0;
data[voice].next_event = vals.release;
}
} else if (events[event_pos].type == SND_SEQ_EVENT_PITCHBEND) {
vals.pitch =
powf(2.0f, (float)(events[event_pos].data.control.value)
* 0.0001220703125f * 0.166666666f);
plugin_data->pitch = vals.pitch;
}
event_pos++;
}
count = (sample_count - pos) > STEP_SIZE ? STEP_SIZE :
sample_count - pos;
for (i=0; i<count; i++) {
output[pos + i] = 0.0f;
}
for (voice = 0; voice < POLYPHONY; voice++) {
if (data[voice].state != inactive) {
run_voice(plugin_data, &vals, &data[voice], output + pos,
count);
}
}
}
}
static void run_voice(LTS *p, synth_vals *vals, voice_data *d, LADSPA_Data *out, unsigned int count)
{
unsigned int i;
for (i=0; i<count; i++) {
d->phase.all += lrintf((float)p->omega[d->note].all * vals->tune *
vals->pitch);
d->env += d->env_d;
out[i] += LERP(vals->timbre,
LERP(FP_FR(d->phase), table[0][FP_IN(d->phase)],
table[0][FP_IN(d->phase) + 1]),
LERP(FP_FR(d->phase), table[1][FP_IN(d->phase)],
table[1][FP_IN(d->phase) + 1])) *
d->amp * d->env;
}
d->counter += count;
if (d->counter >= d->next_event) {
switch (d->state) {
case inactive:
break;
case attack:
d->state = decay;
d->env_d = (vals->sustain - 1.0f) / vals->decay;
d->counter = 0;
d->next_event = vals->decay;
break;
case decay:
d->state = sustain;
d->env_d = 0.0f;
d->counter = 0;
d->next_event = INT_MAX;
break;
case sustain:
d->counter = 0;
break;
case release:
d->state = inactive;
break;
default:
d->state = inactive;
break;
}
}
}
int getControllerLTS(LADSPA_Handle instance, unsigned long port)
{
switch (port) {
case LTS_ATTACK:
return DSSI_CC(0x49);
case LTS_DECAY:
return DSSI_CC(0x4b);
case LTS_SUSTAIN:
return DSSI_CC(0x4f);
case LTS_RELEASE:
return DSSI_CC(0x48);
case LTS_TIMBRE:
return DSSI_CC(0x01);
}
return DSSI_NONE;
}
/* find the voice that is least relevant (low note priority)*/
int pick_voice(const voice_data *data)
{
unsigned int i;
int highest_note = 0;
int highest_note_voice = 0;
/* Look for an inactive voice */
for (i=0; i<POLYPHONY; i++) {
if (data[i].state == inactive) {
return i;
}
}
/* otherwise find for the highest note and replace that */
for (i=0; i<POLYPHONY; i++) {
if (data[i].note > highest_note) {
highest_note = data[i].note;
highest_note_voice = i;
}
}
return highest_note_voice;
}
void _init()
{
unsigned int i;
char **port_names;
float *sin_table;
LADSPA_PortDescriptor *port_descriptors;
LADSPA_PortRangeHint *port_range_hints;
sin_table = malloc(sizeof(float) * TABLE_SIZE);
for (i=0; i<TABLE_SIZE; i++) {
sin_table[i] = sin(2.0 * M_PI * (double)i / (double)TABLE_MODULUS);
}
table[0] = sin_table;
table[1] = saw_table;
ltsLDescriptor =
(LADSPA_Descriptor *) malloc(sizeof(LADSPA_Descriptor));
if (ltsLDescriptor) {
ltsLDescriptor->UniqueID = 24;
ltsLDescriptor->Label = "LTS";
ltsLDescriptor->Properties = 0;
ltsLDescriptor->Name = "Less Trivial synth";
ltsLDescriptor->Maker = "Steve Harris <steve@plugin.org.uk>";
ltsLDescriptor->Copyright = "Public Domain";
ltsLDescriptor->PortCount = LTS_COUNT;
port_descriptors = (LADSPA_PortDescriptor *)
calloc(ltsLDescriptor->PortCount, sizeof
(LADSPA_PortDescriptor));
ltsLDescriptor->PortDescriptors =
(const LADSPA_PortDescriptor *) port_descriptors;
port_range_hints = (LADSPA_PortRangeHint *)
calloc(ltsLDescriptor->PortCount, sizeof
(LADSPA_PortRangeHint));
ltsLDescriptor->PortRangeHints =
(const LADSPA_PortRangeHint *) port_range_hints;
port_names = (char **) calloc(ltsLDescriptor->PortCount, sizeof(char *));
ltsLDescriptor->PortNames = (const char **) port_names;
/* Parameters for output */
port_descriptors[LTS_OUTPUT] = LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO;
port_names[LTS_OUTPUT] = "Output";
port_range_hints[LTS_OUTPUT].HintDescriptor = 0;
/* Parameters for tune */
port_descriptors[LTS_FREQ] = LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
port_names[LTS_FREQ] = "A tuning (Hz)";
port_range_hints[LTS_FREQ].HintDescriptor = LADSPA_HINT_DEFAULT_440 |
LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE;
port_range_hints[LTS_FREQ].LowerBound = 410;
port_range_hints[LTS_FREQ].UpperBound = 460;
/* Parameters for attack */
port_descriptors[LTS_ATTACK] = LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
port_names[LTS_ATTACK] = "Attack time (s)";
port_range_hints[LTS_ATTACK].HintDescriptor =
LADSPA_HINT_DEFAULT_LOW |
LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE;
port_range_hints[LTS_ATTACK].LowerBound = 0.01f;
port_range_hints[LTS_ATTACK].UpperBound = 1.0f;
/* Parameters for decay */
port_descriptors[LTS_DECAY] = port_descriptors[LTS_ATTACK];
port_names[LTS_DECAY] = "Decay time (s)";
port_range_hints[LTS_DECAY].HintDescriptor =
port_range_hints[LTS_ATTACK].HintDescriptor;
port_range_hints[LTS_DECAY].LowerBound =
port_range_hints[LTS_ATTACK].LowerBound;
port_range_hints[LTS_DECAY].UpperBound =
port_range_hints[LTS_ATTACK].UpperBound;
/* Parameters for sustain */
port_descriptors[LTS_SUSTAIN] = LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
port_names[LTS_SUSTAIN] = "Sustain level (%)";
port_range_hints[LTS_SUSTAIN].HintDescriptor =
LADSPA_HINT_DEFAULT_HIGH |
LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE;
port_range_hints[LTS_SUSTAIN].LowerBound = 0.0f;
port_range_hints[LTS_SUSTAIN].UpperBound = 100.0f;
/* Parameters for release */
port_descriptors[LTS_RELEASE] = port_descriptors[LTS_ATTACK];
port_names[LTS_RELEASE] = "Release time (s)";
port_range_hints[LTS_RELEASE].HintDescriptor =
LADSPA_HINT_DEFAULT_MIDDLE | LADSPA_HINT_LOGARITHMIC |
LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE;
port_range_hints[LTS_RELEASE].LowerBound =
port_range_hints[LTS_ATTACK].LowerBound;
port_range_hints[LTS_RELEASE].UpperBound =
port_range_hints[LTS_ATTACK].UpperBound * 4.0f;
/* Parameters for timbre */
port_descriptors[LTS_TIMBRE] = port_descriptors[LTS_ATTACK];
port_names[LTS_TIMBRE] = "Timbre";
port_range_hints[LTS_TIMBRE].HintDescriptor =
LADSPA_HINT_DEFAULT_MIDDLE |
LADSPA_HINT_BOUNDED_BELOW | LADSPA_HINT_BOUNDED_ABOVE;
port_range_hints[LTS_TIMBRE].LowerBound = 0.0f;
port_range_hints[LTS_TIMBRE].UpperBound = 1.0f;
ltsLDescriptor->activate = activateLTS;
ltsLDescriptor->cleanup = cleanupLTS;
ltsLDescriptor->connect_port = connectPortLTS;
ltsLDescriptor->deactivate = NULL;
ltsLDescriptor->instantiate = instantiateLTS;
ltsLDescriptor->run = runLTSWrapper;
ltsLDescriptor->run_adding = NULL;
ltsLDescriptor->set_run_adding_gain = NULL;
}
ltsDDescriptor = (DSSI_Descriptor *) malloc(sizeof(DSSI_Descriptor));
if (ltsDDescriptor) {
ltsDDescriptor->DSSI_API_Version = 1;
ltsDDescriptor->LADSPA_Plugin = ltsLDescriptor;
ltsDDescriptor->configure = NULL;
ltsDDescriptor->get_program = NULL;
ltsDDescriptor->get_midi_controller_for_port = getControllerLTS;
ltsDDescriptor->select_program = NULL;
ltsDDescriptor->run_synth = runLTS;
ltsDDescriptor->run_synth_adding = NULL;
ltsDDescriptor->run_multiple_synths = NULL;
ltsDDescriptor->run_multiple_synths_adding = NULL;
}
}
void _fini()
{
if (ltsLDescriptor) {
free((LADSPA_PortDescriptor *) ltsLDescriptor->PortDescriptors);
free((char **) ltsLDescriptor->PortNames);
free((LADSPA_PortRangeHint *) ltsLDescriptor->PortRangeHints);
free(ltsLDescriptor);
}
if (ltsDDescriptor) {
free(ltsDDescriptor);
}
}