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-rw-r--r--quantum/audio/voices.c170
1 files changed, 116 insertions, 54 deletions
diff --git a/quantum/audio/voices.c b/quantum/audio/voices.c
index 1592618be..8988d827e 100644
--- a/quantum/audio/voices.c
+++ b/quantum/audio/voices.c
@@ -1,4 +1,5 @@
1/* Copyright 2016 Jack Humbert 1/* Copyright 2016 Jack Humbert
2 * Copyright 2020 JohSchneider
2 * 3 *
3 * This program is free software: you can redistribute it and/or modify 4 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by 5 * it under the terms of the GNU General Public License as published by
@@ -17,13 +18,19 @@
17#include "audio.h" 18#include "audio.h"
18#include <stdlib.h> 19#include <stdlib.h>
19 20
20// these are imported from audio.c 21uint8_t note_timbre = TIMBRE_DEFAULT;
21extern uint16_t envelope_index; 22bool glissando = false;
22extern float note_timbre; 23bool vibrato = false;
23extern float polyphony_rate; 24float vibrato_strength = 0.5;
24extern bool glissando; 25float vibrato_rate = 0.125;
25 26
27uint16_t voices_timer = 0;
28
29#ifdef AUDIO_VOICE_DEFAULT
30voice_type voice = AUDIO_VOICE_DEFAULT;
31#else
26voice_type voice = default_voice; 32voice_type voice = default_voice;
33#endif
27 34
28void set_voice(voice_type v) { voice = v; } 35void set_voice(voice_type v) { voice = v; }
29 36
@@ -31,22 +38,54 @@ void voice_iterate() { voice = (voice + 1) % number_of_voices; }
31 38
32void voice_deiterate() { voice = (voice - 1 + number_of_voices) % number_of_voices; } 39void voice_deiterate() { voice = (voice - 1 + number_of_voices) % number_of_voices; }
33 40
41#ifdef AUDIO_VOICES
42float mod(float a, int b) {
43 float r = fmod(a, b);
44 return r < 0 ? r + b : r;
45}
46
47// Effect: 'vibrate' a given target frequency slightly above/below its initial value
48float voice_add_vibrato(float average_freq) {
49 float vibrato_counter = mod(timer_read() / (100 * vibrato_rate), VIBRATO_LUT_LENGTH);
50
51 return average_freq * pow(vibrato_lut[(int)vibrato_counter], vibrato_strength);
52}
53
54// Effect: 'slides' the 'frequency' from the starting-point, to the target frequency
55float voice_add_glissando(float from_freq, float to_freq) {
56 if (to_freq != 0 && from_freq < to_freq && from_freq < to_freq * pow(2, -440 / to_freq / 12 / 2)) {
57 return from_freq * pow(2, 440 / from_freq / 12 / 2);
58 } else if (to_freq != 0 && from_freq > to_freq && from_freq > to_freq * pow(2, 440 / to_freq / 12 / 2)) {
59 return from_freq * pow(2, -440 / from_freq / 12 / 2);
60 } else {
61 return to_freq;
62 }
63}
64#endif
65
34float voice_envelope(float frequency) { 66float voice_envelope(float frequency) {
35 // envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz 67 // envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
36 __attribute__((unused)) uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency)); 68// __attribute__((unused)) uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency));
69#ifdef AUDIO_VOICES
70 uint16_t envelope_index = timer_elapsed(voices_timer); // TODO: multiply in some factor?
71 uint16_t compensated_index = envelope_index / 100; // TODO: correct factor would be?
72#endif
37 73
38 switch (voice) { 74 switch (voice) {
39 case default_voice: 75 case default_voice:
40 glissando = false; 76 glissando = false;
41 note_timbre = TIMBRE_50; 77 // note_timbre = TIMBRE_50; //Note: leave the user the possibility to adjust the timbre with 'audio_set_timbre'
42 polyphony_rate = 0;
43 break; 78 break;
44 79
45#ifdef AUDIO_VOICES 80#ifdef AUDIO_VOICES
46 81
82 case vibrating:
83 glissando = false;
84 vibrato = true;
85 break;
86
47 case something: 87 case something:
48 glissando = false; 88 glissando = false;
49 polyphony_rate = 0;
50 switch (compensated_index) { 89 switch (compensated_index) {
51 case 0 ... 9: 90 case 0 ... 9:
52 note_timbre = TIMBRE_12; 91 note_timbre = TIMBRE_12;
@@ -57,24 +96,23 @@ float voice_envelope(float frequency) {
57 break; 96 break;
58 97
59 case 20 ... 200: 98 case 20 ... 200:
60 note_timbre = .125 + .125; 99 note_timbre = 12 + 12;
61 break; 100 break;
62 101
63 default: 102 default:
64 note_timbre = .125; 103 note_timbre = 12;
65 break; 104 break;
66 } 105 }
67 break; 106 break;
68 107
69 case drums: 108 case drums:
70 glissando = false; 109 glissando = false;
71 polyphony_rate = 0;
72 // switch (compensated_index) { 110 // switch (compensated_index) {
73 // case 0 ... 10: 111 // case 0 ... 10:
74 // note_timbre = 0.5; 112 // note_timbre = 50;
75 // break; 113 // break;
76 // case 11 ... 20: 114 // case 11 ... 20:
77 // note_timbre = 0.5 * (21 - compensated_index) / 10; 115 // note_timbre = 50 * (21 - compensated_index) / 10;
78 // break; 116 // break;
79 // default: 117 // default:
80 // note_timbre = 0; 118 // note_timbre = 0;
@@ -88,10 +126,10 @@ float voice_envelope(float frequency) {
88 frequency = (rand() % (int)(40)) + 60; 126 frequency = (rand() % (int)(40)) + 60;
89 switch (envelope_index) { 127 switch (envelope_index) {
90 case 0 ... 10: 128 case 0 ... 10:
91 note_timbre = 0.5; 129 note_timbre = 50;
92 break; 130 break;
93 case 11 ... 20: 131 case 11 ... 20:
94 note_timbre = 0.5 * (21 - envelope_index) / 10; 132 note_timbre = 50 * (21 - envelope_index) / 10;
95 break; 133 break;
96 default: 134 default:
97 note_timbre = 0; 135 note_timbre = 0;
@@ -103,10 +141,10 @@ float voice_envelope(float frequency) {
103 frequency = (rand() % (int)(1000)) + 1000; 141 frequency = (rand() % (int)(1000)) + 1000;
104 switch (envelope_index) { 142 switch (envelope_index) {
105 case 0 ... 5: 143 case 0 ... 5:
106 note_timbre = 0.5; 144 note_timbre = 50;
107 break; 145 break;
108 case 6 ... 20: 146 case 6 ... 20:
109 note_timbre = 0.5 * (21 - envelope_index) / 15; 147 note_timbre = 50 * (21 - envelope_index) / 15;
110 break; 148 break;
111 default: 149 default:
112 note_timbre = 0; 150 note_timbre = 0;
@@ -118,10 +156,10 @@ float voice_envelope(float frequency) {
118 frequency = (rand() % (int)(2000)) + 3000; 156 frequency = (rand() % (int)(2000)) + 3000;
119 switch (envelope_index) { 157 switch (envelope_index) {
120 case 0 ... 15: 158 case 0 ... 15:
121 note_timbre = 0.5; 159 note_timbre = 50;
122 break; 160 break;
123 case 16 ... 20: 161 case 16 ... 20:
124 note_timbre = 0.5 * (21 - envelope_index) / 5; 162 note_timbre = 50 * (21 - envelope_index) / 5;
125 break; 163 break;
126 default: 164 default:
127 note_timbre = 0; 165 note_timbre = 0;
@@ -133,10 +171,10 @@ float voice_envelope(float frequency) {
133 frequency = (rand() % (int)(2000)) + 3000; 171 frequency = (rand() % (int)(2000)) + 3000;
134 switch (envelope_index) { 172 switch (envelope_index) {
135 case 0 ... 35: 173 case 0 ... 35:
136 note_timbre = 0.5; 174 note_timbre = 50;
137 break; 175 break;
138 case 36 ... 50: 176 case 36 ... 50:
139 note_timbre = 0.5 * (51 - envelope_index) / 15; 177 note_timbre = 50 * (51 - envelope_index) / 15;
140 break; 178 break;
141 default: 179 default:
142 note_timbre = 0; 180 note_timbre = 0;
@@ -145,8 +183,7 @@ float voice_envelope(float frequency) {
145 } 183 }
146 break; 184 break;
147 case butts_fader: 185 case butts_fader:
148 glissando = true; 186 glissando = true;
149 polyphony_rate = 0;
150 switch (compensated_index) { 187 switch (compensated_index) {
151 case 0 ... 9: 188 case 0 ... 9:
152 frequency = frequency / 4; 189 frequency = frequency / 4;
@@ -159,7 +196,7 @@ float voice_envelope(float frequency) {
159 break; 196 break;
160 197
161 case 20 ... 200: 198 case 20 ... 200:
162 note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2) * .125; 199 note_timbre = 12 - (uint8_t)(pow(((float)compensated_index - 20) / (200 - 20), 2) * 12.5);
163 break; 200 break;
164 201
165 default: 202 default:
@@ -169,7 +206,6 @@ float voice_envelope(float frequency) {
169 break; 206 break;
170 207
171 // case octave_crunch: 208 // case octave_crunch:
172 // polyphony_rate = 0;
173 // switch (compensated_index) { 209 // switch (compensated_index) {
174 // case 0 ... 9: 210 // case 0 ... 9:
175 // case 20 ... 24: 211 // case 20 ... 24:
@@ -187,14 +223,13 @@ float voice_envelope(float frequency) {
187 223
188 // default: 224 // default:
189 // note_timbre = TIMBRE_12; 225 // note_timbre = TIMBRE_12;
190 // break; 226 // break;
191 // } 227 // }
192 // break; 228 // break;
193 229
194 case duty_osc: 230 case duty_osc:
195 // This slows the loop down a substantial amount, so higher notes may freeze 231 // This slows the loop down a substantial amount, so higher notes may freeze
196 glissando = true; 232 glissando = true;
197 polyphony_rate = 0;
198 switch (compensated_index) { 233 switch (compensated_index) {
199 default: 234 default:
200# define OCS_SPEED 10 235# define OCS_SPEED 10
@@ -202,38 +237,36 @@ float voice_envelope(float frequency) {
202 // sine wave is slow 237 // sine wave is slow
203 // note_timbre = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5; 238 // note_timbre = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5;
204 // triangle wave is a bit faster 239 // triangle wave is a bit faster
205 note_timbre = (float)abs((compensated_index * OCS_SPEED % 3000) - 1500) * (OCS_AMP / 1500) + (1 - OCS_AMP) / 2; 240 note_timbre = (uint8_t)abs((compensated_index * OCS_SPEED % 3000) - 1500) * (OCS_AMP / 1500) + (1 - OCS_AMP) / 2;
206 break; 241 break;
207 } 242 }
208 break; 243 break;
209 244
210 case duty_octave_down: 245 case duty_octave_down:
211 glissando = true; 246 glissando = true;
212 polyphony_rate = 0; 247 note_timbre = (uint8_t)(100 * (envelope_index % 2) * .125 + .375 * 2);
213 note_timbre = (envelope_index % 2) * .125 + .375 * 2; 248 if ((envelope_index % 4) == 0) note_timbre = 50;
214 if ((envelope_index % 4) == 0) note_timbre = 0.5;
215 if ((envelope_index % 8) == 0) note_timbre = 0; 249 if ((envelope_index % 8) == 0) note_timbre = 0;
216 break; 250 break;
217 case delayed_vibrato: 251 case delayed_vibrato:
218 glissando = true; 252 glissando = true;
219 polyphony_rate = 0; 253 note_timbre = TIMBRE_50;
220 note_timbre = TIMBRE_50;
221# define VOICE_VIBRATO_DELAY 150 254# define VOICE_VIBRATO_DELAY 150
222# define VOICE_VIBRATO_SPEED 50 255# define VOICE_VIBRATO_SPEED 50
223 switch (compensated_index) { 256 switch (compensated_index) {
224 case 0 ... VOICE_VIBRATO_DELAY: 257 case 0 ... VOICE_VIBRATO_DELAY:
225 break; 258 break;
226 default: 259 default:
260 // TODO: merge/replace with voice_add_vibrato above
227 frequency = frequency * vibrato_lut[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1)) / 1000 * VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)]; 261 frequency = frequency * vibrato_lut[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1)) / 1000 * VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
228 break; 262 break;
229 } 263 }
230 break; 264 break;
231 // case delayed_vibrato_octave: 265 // case delayed_vibrato_octave:
232 // polyphony_rate = 0;
233 // if ((envelope_index % 2) == 1) { 266 // if ((envelope_index % 2) == 1) {
234 // note_timbre = 0.55; 267 // note_timbre = 55;
235 // } else { 268 // } else {
236 // note_timbre = 0.45; 269 // note_timbre = 45;
237 // } 270 // }
238 // #define VOICE_VIBRATO_DELAY 150 271 // #define VOICE_VIBRATO_DELAY 150
239 // #define VOICE_VIBRATO_SPEED 50 272 // #define VOICE_VIBRATO_SPEED 50
@@ -246,35 +279,64 @@ float voice_envelope(float frequency) {
246 // } 279 // }
247 // break; 280 // break;
248 // case duty_fifth_down: 281 // case duty_fifth_down:
249 // note_timbre = 0.5; 282 // note_timbre = TIMBRE_50;
250 // if ((envelope_index % 3) == 0) 283 // if ((envelope_index % 3) == 0)
251 // note_timbre = 0.75; 284 // note_timbre = TIMBRE_75;
252 // break; 285 // break;
253 // case duty_fourth_down: 286 // case duty_fourth_down:
254 // note_timbre = 0.0; 287 // note_timbre = 0;
255 // if ((envelope_index % 12) == 0) 288 // if ((envelope_index % 12) == 0)
256 // note_timbre = 0.75; 289 // note_timbre = TIMBRE_75;
257 // if (((envelope_index % 12) % 4) != 1) 290 // if (((envelope_index % 12) % 4) != 1)
258 // note_timbre = 0.75; 291 // note_timbre = TIMBRE_75;
259 // break; 292 // break;
260 // case duty_third_down: 293 // case duty_third_down:
261 // note_timbre = 0.5; 294 // note_timbre = TIMBRE_50;
262 // if ((envelope_index % 5) == 0) 295 // if ((envelope_index % 5) == 0)
263 // note_timbre = 0.75; 296 // note_timbre = TIMBRE_75;
264 // break; 297 // break;
265 // case duty_fifth_third_down: 298 // case duty_fifth_third_down:
266 // note_timbre = 0.5; 299 // note_timbre = TIMBRE_50;
267 // if ((envelope_index % 5) == 0) 300 // if ((envelope_index % 5) == 0)
268 // note_timbre = 0.75; 301 // note_timbre = TIMBRE_75;
269 // if ((envelope_index % 3) == 0) 302 // if ((envelope_index % 3) == 0)
270 // note_timbre = 0.25; 303 // note_timbre = TIMBRE_25;
271 // break; 304 // break;
272 305
273#endif 306#endif // AUDIO_VOICES
274 307
275 default: 308 default:
276 break; 309 break;
277 } 310 }
278 311
312#ifdef AUDIO_VOICES
313 if (vibrato && (vibrato_strength > 0)) {
314 frequency = voice_add_vibrato(frequency);
315 }
316
317 if (glissando) {
318 // TODO: where to keep track of the start-frequency?
319 // frequency = voice_add_glissando(??, frequency);
320 }
321#endif // AUDIO_VOICES
322
279 return frequency; 323 return frequency;
280} 324}
325
326// Vibrato functions
327
328void voice_set_vibrato_rate(float rate) { vibrato_rate = rate; }
329void voice_increase_vibrato_rate(float change) { vibrato_rate *= change; }
330void voice_decrease_vibrato_rate(float change) { vibrato_rate /= change; }
331void voice_set_vibrato_strength(float strength) { vibrato_strength = strength; }
332void voice_increase_vibrato_strength(float change) { vibrato_strength *= change; }
333void voice_decrease_vibrato_strength(float change) { vibrato_strength /= change; }
334
335// Timbre functions
336
337void voice_set_timbre(uint8_t timbre) {
338 if ((timbre > 0) && (timbre < 100)) {
339 note_timbre = timbre;
340 }
341}
342uint8_t voice_get_timbre(void) { return note_timbre; }
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-04 02:53:04 +0000