process_midi.c
10809 bytes
1/* Copyright 2016 Jack Humbert
2 *
3 * 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 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16#include "process_midi.h"
17
18#include <LUFA/Drivers/USB/USB.h>
19#include "midi.h"
20#include "qmk_midi.h"
21#include "timer.h"
22#include "debug.h"
23
24#ifdef MIDI_BASIC
25
26void process_midi_basic_noteon(uint8_t note) {
27 midi_send_noteon(&midi_device, 0, note, 127);
28}
29
30void process_midi_basic_noteoff(uint8_t note) {
31 midi_send_noteoff(&midi_device, 0, note, 0);
32}
33
34void process_midi_all_notes_off(void) {
35 midi_send_cc(&midi_device, 0, 0x7B, 0);
36}
37
38#endif // MIDI_BASIC
39
40#ifdef MIDI_ADVANCED
41static uint8_t tone_status[MIDI_TONE_COUNT];
42
43static uint8_t midi_modulation;
44static int8_t midi_modulation_step;
45static uint16_t midi_modulation_timer;
46midi_config_t midi_config;
47
48inline uint8_t compute_velocity(uint8_t setting) {
49 return setting * (128 / (MIDI_VELOCITY_MAX - MIDI_VELOCITY_MIN));
50}
51
52void midi_init(void) {
53 midi_config.octave = QK_MIDI_OCTAVE_2 - MIDI_OCTAVE_MIN;
54 midi_config.transpose = 0;
55 midi_config.velocity = 127;
56 midi_config.channel = 0;
57 midi_config.modulation_interval = 8;
58
59 for (uint8_t i = 0; i < MIDI_TONE_COUNT; i++) {
60 tone_status[i] = MIDI_INVALID_NOTE;
61 }
62
63 midi_modulation = 0;
64 midi_modulation_step = 0;
65 midi_modulation_timer = 0;
66}
67
68uint8_t midi_compute_note(uint16_t keycode) {
69 return 12 * midi_config.octave + (keycode - MIDI_TONE_MIN) + midi_config.transpose;
70}
71
72bool process_midi(uint16_t keycode, keyrecord_t *record) {
73 switch (keycode) {
74 case MIDI_TONE_MIN ... MIDI_TONE_MAX: {
75 uint8_t channel = midi_config.channel;
76 uint8_t tone = keycode - MIDI_TONE_MIN;
77 uint8_t velocity = midi_config.velocity;
78 if (record->event.pressed) {
79 if (tone_status[tone] == MIDI_INVALID_NOTE) {
80 uint8_t note = midi_compute_note(keycode);
81 midi_send_noteon(&midi_device, channel, note, velocity);
82 dprintf("midi noteon channel:%d note:%d velocity:%d\n", channel, note, velocity);
83 tone_status[tone] = note;
84 }
85 } else {
86 uint8_t note = tone_status[tone];
87 if (note != MIDI_INVALID_NOTE) {
88 midi_send_noteoff(&midi_device, channel, note, velocity);
89 dprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
90 }
91 tone_status[tone] = MIDI_INVALID_NOTE;
92 }
93 return false;
94 }
95 case MIDI_OCTAVE_MIN ... MIDI_OCTAVE_MAX:
96 if (record->event.pressed) {
97 midi_config.octave = keycode - MIDI_OCTAVE_MIN;
98 dprintf("midi octave %d\n", midi_config.octave);
99 }
100 return false;
101 case QK_MIDI_OCTAVE_DOWN:
102 if (record->event.pressed && midi_config.octave > 0) {
103 midi_config.octave--;
104 dprintf("midi octave %d\n", midi_config.octave);
105 }
106 return false;
107 case QK_MIDI_OCTAVE_UP:
108 if (record->event.pressed && midi_config.octave < (MIDI_OCTAVE_MAX - MIDI_OCTAVE_MIN)) {
109 midi_config.octave++;
110 dprintf("midi octave %d\n", midi_config.octave);
111 }
112 return false;
113 case MIDI_TRANSPOSE_MIN ... MIDI_TRANSPOSE_MAX:
114 if (record->event.pressed) {
115 midi_config.transpose = keycode - QK_MIDI_TRANSPOSE_0;
116 dprintf("midi transpose %d\n", midi_config.transpose);
117 }
118 return false;
119 case QK_MIDI_TRANSPOSE_DOWN:
120 if (record->event.pressed && midi_config.transpose > (MIDI_TRANSPOSE_MIN - QK_MIDI_TRANSPOSE_0)) {
121 midi_config.transpose--;
122 dprintf("midi transpose %d\n", midi_config.transpose);
123 }
124 return false;
125 case QK_MIDI_TRANSPOSE_UP:
126 if (record->event.pressed && midi_config.transpose < (MIDI_TRANSPOSE_MAX - QK_MIDI_TRANSPOSE_0)) {
127 const bool positive = midi_config.transpose > 0;
128 midi_config.transpose++;
129 if (positive && midi_config.transpose < 0) midi_config.transpose--;
130 dprintf("midi transpose %d\n", midi_config.transpose);
131 }
132 return false;
133 case MIDI_VELOCITY_MIN ... MIDI_VELOCITY_MAX:
134 if (record->event.pressed) {
135 midi_config.velocity = compute_velocity(keycode - MIDI_VELOCITY_MIN);
136 dprintf("midi velocity %d\n", midi_config.velocity);
137 }
138 return false;
139 case QK_MIDI_VELOCITY_DOWN:
140 if (record->event.pressed && midi_config.velocity > 0) {
141 if (midi_config.velocity == 127) {
142 midi_config.velocity -= 10;
143 } else if (midi_config.velocity > 12) {
144 midi_config.velocity -= 13;
145 } else {
146 midi_config.velocity = 0;
147 }
148
149 dprintf("midi velocity %d\n", midi_config.velocity);
150 }
151 return false;
152 case QK_MIDI_VELOCITY_UP:
153 if (record->event.pressed && midi_config.velocity < 127) {
154 if (midi_config.velocity < 115) {
155 midi_config.velocity += 13;
156 } else {
157 midi_config.velocity = 127;
158 }
159 dprintf("midi velocity %d\n", midi_config.velocity);
160 }
161 return false;
162 case MIDI_CHANNEL_MIN ... MIDI_CHANNEL_MAX:
163 if (record->event.pressed) {
164 midi_config.channel = keycode - MIDI_CHANNEL_MIN;
165 dprintf("midi channel %d\n", midi_config.channel);
166 }
167 return false;
168 case QK_MIDI_CHANNEL_DOWN:
169 if (record->event.pressed) {
170 midi_config.channel--;
171 dprintf("midi channel %d\n", midi_config.channel);
172 }
173 return false;
174 case QK_MIDI_CHANNEL_UP:
175 if (record->event.pressed) {
176 midi_config.channel++;
177 dprintf("midi channel %d\n", midi_config.channel);
178 }
179 return false;
180 case QK_MIDI_ALL_NOTES_OFF:
181 if (record->event.pressed) {
182 midi_send_cc(&midi_device, midi_config.channel, 0x7B, 0);
183 dprintf("midi all notes off\n");
184 }
185 return false;
186 case QK_MIDI_SUSTAIN:
187 midi_send_cc(&midi_device, midi_config.channel, 0x40, record->event.pressed ? 127 : 0);
188 dprintf("midi sustain %d\n", record->event.pressed);
189 return false;
190 case QK_MIDI_PORTAMENTO:
191 midi_send_cc(&midi_device, midi_config.channel, 0x41, record->event.pressed ? 127 : 0);
192 dprintf("midi portamento %d\n", record->event.pressed);
193 return false;
194 case QK_MIDI_SOSTENUTO:
195 midi_send_cc(&midi_device, midi_config.channel, 0x42, record->event.pressed ? 127 : 0);
196 dprintf("midi sostenuto %d\n", record->event.pressed);
197 return false;
198 case QK_MIDI_SOFT:
199 midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
200 dprintf("midi soft %d\n", record->event.pressed);
201 return false;
202 case QK_MIDI_LEGATO:
203 midi_send_cc(&midi_device, midi_config.channel, 0x44, record->event.pressed ? 127 : 0);
204 dprintf("midi legato %d\n", record->event.pressed);
205 return false;
206 case QK_MIDI_MODULATION:
207 midi_modulation_step = record->event.pressed ? 1 : -1;
208 return false;
209 case QK_MIDI_MODULATION_SPEED_DOWN:
210 if (record->event.pressed) {
211 midi_config.modulation_interval++;
212 // prevent overflow
213 if (midi_config.modulation_interval == 0) midi_config.modulation_interval--;
214 dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
215 }
216 return false;
217 case QK_MIDI_MODULATION_SPEED_UP:
218 if (record->event.pressed && midi_config.modulation_interval > 0) {
219 midi_config.modulation_interval--;
220 dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
221 }
222 return false;
223 case QK_MIDI_PITCH_BEND_DOWN:
224 if (record->event.pressed) {
225 midi_send_pitchbend(&midi_device, midi_config.channel, -0x2000);
226 dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, -0x2000);
227 } else {
228 midi_send_pitchbend(&midi_device, midi_config.channel, 0);
229 dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, 0);
230 }
231 return false;
232 case QK_MIDI_PITCH_BEND_UP:
233 if (record->event.pressed) {
234 midi_send_pitchbend(&midi_device, midi_config.channel, 0x1fff);
235 dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, 0x1fff);
236 } else {
237 midi_send_pitchbend(&midi_device, midi_config.channel, 0);
238 dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, 0);
239 }
240 return false;
241 };
242
243 return true;
244}
245
246#endif // MIDI_ADVANCED
247
248void midi_task(void) {
249 midi_device_process(&midi_device);
250#ifdef MIDI_ADVANCED
251 if (timer_elapsed(midi_modulation_timer) < midi_config.modulation_interval) return;
252 midi_modulation_timer = timer_read();
253
254 if (midi_modulation_step != 0) {
255 dprintf("midi modulation %d\n", midi_modulation);
256 midi_send_cc(&midi_device, midi_config.channel, 0x1, midi_modulation);
257
258 if (midi_modulation_step < 0 && midi_modulation < -midi_modulation_step) {
259 midi_modulation = 0;
260 midi_modulation_step = 0;
261 return;
262 }
263
264 midi_modulation += midi_modulation_step;
265
266 if (midi_modulation > 127) midi_modulation = 127;
267 }
268#endif
269}