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qmk_firmware/quantum/process_keycode/process_midi.c
jakobkg bf84d35117
Change MIDI velocity implementation to allow direct control of velocity value (#9940) 
* Initial changes to expose "real" MIDI velocity

* Change MI_VELU and MI_VELD to fit new logic

* Apply cleanups from fauxpark's review

my bad on the errant whitespace and else {} placements

* Slight changes to MI_VELD to match values when velocity is falling to when it is rising

* Add keycode MI_VEL_0

* Update compute_velocity() to handle MI_VEL_0

* Store velocity as 7 bits to hard cap value at 127
2020-10-30 13:15:37 -07:00

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/* Copyright 2016 Jack Humbert
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "process_midi.h"
#ifdef MIDI_ENABLE
# include <LUFA/Drivers/USB/USB.h>
# include "midi.h"
# include "qmk_midi.h"
# ifdef MIDI_BASIC
void process_midi_basic_noteon(uint8_t note) { midi_send_noteon(&midi_device, 0, note, 127); }
void process_midi_basic_noteoff(uint8_t note) { midi_send_noteoff(&midi_device, 0, note, 0); }
void process_midi_all_notes_off(void) { midi_send_cc(&midi_device, 0, 0x7B, 0); }
# endif // MIDI_BASIC
# ifdef MIDI_ADVANCED
# include "timer.h"
static uint8_t tone_status[MIDI_TONE_COUNT];
static uint8_t midi_modulation;
static int8_t midi_modulation_step;
static uint16_t midi_modulation_timer;
midi_config_t midi_config;
inline uint8_t compute_velocity(uint8_t setting) { return setting * (128 / (MIDI_VELOCITY_MAX - MIDI_VELOCITY_MIN)); }
void midi_init(void) {
midi_config.octave = MI_OCT_2 - MIDI_OCTAVE_MIN;
midi_config.transpose = 0;
midi_config.velocity = 127;
midi_config.channel = 0;
midi_config.modulation_interval = 8;
for (uint8_t i = 0; i < MIDI_TONE_COUNT; i++) {
tone_status[i] = MIDI_INVALID_NOTE;
}
midi_modulation = 0;
midi_modulation_step = 0;
midi_modulation_timer = 0;
}
uint8_t midi_compute_note(uint16_t keycode) { return 12 * midi_config.octave + (keycode - MIDI_TONE_MIN) + midi_config.transpose; }
bool process_midi(uint16_t keycode, keyrecord_t *record) {
switch (keycode) {
case MIDI_TONE_MIN ... MIDI_TONE_MAX: {
uint8_t channel = midi_config.channel;
uint8_t tone = keycode - MIDI_TONE_MIN;
uint8_t velocity = midi_config.velocity;
if (record->event.pressed) {
if (tone_status[tone] == MIDI_INVALID_NOTE) {
uint8_t note = midi_compute_note(keycode);
midi_send_noteon(&midi_device, channel, note, velocity);
dprintf("midi noteon channel:%d note:%d velocity:%d\n", channel, note, velocity);
tone_status[tone] = note;
}
} else {
uint8_t note = tone_status[tone];
if (note != MIDI_INVALID_NOTE) {
midi_send_noteoff(&midi_device, channel, note, velocity);
dprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
}
tone_status[tone] = MIDI_INVALID_NOTE;
}
return false;
}
case MIDI_OCTAVE_MIN ... MIDI_OCTAVE_MAX:
if (record->event.pressed) {
midi_config.octave = keycode - MIDI_OCTAVE_MIN;
dprintf("midi octave %d\n", midi_config.octave);
}
return false;
case MI_OCTD:
if (record->event.pressed && midi_config.octave > 0) {
midi_config.octave--;
dprintf("midi octave %d\n", midi_config.octave);
}
return false;
case MI_OCTU:
if (record->event.pressed && midi_config.octave < (MIDI_OCTAVE_MAX - MIDI_OCTAVE_MIN)) {
midi_config.octave++;
dprintf("midi octave %d\n", midi_config.octave);
}
return false;
case MIDI_TRANSPOSE_MIN ... MIDI_TRANSPOSE_MAX:
if (record->event.pressed) {
midi_config.transpose = keycode - MI_TRNS_0;
dprintf("midi transpose %d\n", midi_config.transpose);
}
return false;
case MI_TRNSD:
if (record->event.pressed && midi_config.transpose > (MIDI_TRANSPOSE_MIN - MI_TRNS_0)) {
midi_config.transpose--;
dprintf("midi transpose %d\n", midi_config.transpose);
}
return false;
case MI_TRNSU:
if (record->event.pressed && midi_config.transpose < (MIDI_TRANSPOSE_MAX - MI_TRNS_0)) {
const bool positive = midi_config.transpose > 0;
midi_config.transpose++;
if (positive && midi_config.transpose < 0) midi_config.transpose--;
dprintf("midi transpose %d\n", midi_config.transpose);
}
return false;
case MIDI_VELOCITY_MIN ... MIDI_VELOCITY_MAX:
if (record->event.pressed) {
midi_config.velocity = compute_velocity(keycode - MIDI_VELOCITY_MIN);
dprintf("midi velocity %d\n", midi_config.velocity);
}
return false;
case MI_VELD:
if (record->event.pressed && midi_config.velocity > 0) {
if (midi_config.velocity == 127) {
midi_config.velocity -= 10;
} else if (midi_config.velocity > 12) {
midi_config.velocity -= 13;
} else {
midi_config.velocity = 0;
}
dprintf("midi velocity %d\n", midi_config.velocity);
}
return false;
case MI_VELU:
if (record->event.pressed && midi_config.velocity < 127) {
if (midi_config.velocity < 115) {
midi_config.velocity += 13;
} else {
midi_config.velocity = 127;
}
dprintf("midi velocity %d\n", midi_config.velocity);
}
return false;
case MIDI_CHANNEL_MIN ... MIDI_CHANNEL_MAX:
if (record->event.pressed) {
midi_config.channel = keycode - MIDI_CHANNEL_MIN;
dprintf("midi channel %d\n", midi_config.channel);
}
return false;
case MI_CHD:
if (record->event.pressed) {
midi_config.channel--;
dprintf("midi channel %d\n", midi_config.channel);
}
return false;
case MI_CHU:
if (record->event.pressed) {
midi_config.channel++;
dprintf("midi channel %d\n", midi_config.channel);
}
return false;
case MI_ALLOFF:
if (record->event.pressed) {
midi_send_cc(&midi_device, midi_config.channel, 0x7B, 0);
dprintf("midi all notes off\n");
}
return false;
case MI_SUS:
midi_send_cc(&midi_device, midi_config.channel, 0x40, record->event.pressed ? 127 : 0);
dprintf("midi sustain %d\n", record->event.pressed);
return false;
case MI_PORT:
midi_send_cc(&midi_device, midi_config.channel, 0x41, record->event.pressed ? 127 : 0);
dprintf("midi portamento %d\n", record->event.pressed);
return false;
case MI_SOST:
midi_send_cc(&midi_device, midi_config.channel, 0x42, record->event.pressed ? 127 : 0);
dprintf("midi sostenuto %d\n", record->event.pressed);
return false;
case MI_SOFT:
midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
dprintf("midi soft %d\n", record->event.pressed);
return false;
case MI_LEG:
midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
dprintf("midi legato %d\n", record->event.pressed);
return false;
case MI_MOD:
midi_modulation_step = record->event.pressed ? 1 : -1;
return false;
case MI_MODSD:
if (record->event.pressed) {
midi_config.modulation_interval++;
// prevent overflow
if (midi_config.modulation_interval == 0) midi_config.modulation_interval--;
dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
}
return false;
case MI_MODSU:
if (record->event.pressed && midi_config.modulation_interval > 0) {
midi_config.modulation_interval--;
dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
}
return false;
case MI_BENDD:
if (record->event.pressed) {
midi_send_pitchbend(&midi_device, midi_config.channel, -0x2000);
dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, -0x2000);
} else {
midi_send_pitchbend(&midi_device, midi_config.channel, 0);
dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, 0);
}
return false;
case MI_BENDU:
if (record->event.pressed) {
midi_send_pitchbend(&midi_device, midi_config.channel, 0x1fff);
dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, 0x1fff);
} else {
midi_send_pitchbend(&midi_device, midi_config.channel, 0);
dprintf("midi pitchbend channel:%d amount:%d\n", midi_config.channel, 0);
}
return false;
};
return true;
}
# endif // MIDI_ADVANCED
void midi_task(void) {
midi_device_process(&midi_device);
# ifdef MIDI_ADVANCED
if (timer_elapsed(midi_modulation_timer) < midi_config.modulation_interval) return;
midi_modulation_timer = timer_read();
if (midi_modulation_step != 0) {
dprintf("midi modulation %d\n", midi_modulation);
midi_send_cc(&midi_device, midi_config.channel, 0x1, midi_modulation);
if (midi_modulation_step < 0 && midi_modulation < -midi_modulation_step) {
midi_modulation = 0;
midi_modulation_step = 0;
return;
}
midi_modulation += midi_modulation_step;
if (midi_modulation > 127) midi_modulation = 127;
}
# endif
}
#endif // MIDI_ENABLE
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