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MicroDexed
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MicroDexed/dexed.cpp

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/*
MicroDexed
MicroDexed is a port of the Dexed sound engine
(https://github.com/asb2m10/dexed) for the Teensy-3.5/3.6/4.x with audio shield.
Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
(c)2018-2020 H. Wirtz <wirtz@parasitstudio.de>
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 3 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "synth.h"
#include "dexed.h"
#include "EngineMkI.h"
#include "EngineOpl.h"
#include "fm_core.h"
#include "exp2.h"
#include "sin.h"
#include "freqlut.h"
#include "controllers.h"
#include "PluginFx.h"
#include <unistd.h>
#include <limits.h>
#include "porta.h"
#ifdef USE_TEENSY_DSP
#include <Audio.h>
#endif
extern config_t configuration;
Dexed::Dexed(int rate)
{
uint8_t i;
Exp2::init();
Tanh::init();
Sin::init();
Freqlut::init(rate);
Lfo::init(rate);
PitchEnv::init(rate);
Env::init_sr(rate);
Porta::init_sr(rate);
fx.init(rate);
engineMkI = new EngineMkI;
engineOpl = new EngineOpl;
engineMsfa = new FmCore;
for (i = 0; i < MAX_ACTIVE_NOTES; i++) {
voices[i].dx7_note = new Dx7Note;
voices[i].keydown = false;
voices[i].sustained = false;
voices[i].live = false;
voices[i].key_pressed_timer = 0;
}
max_notes = MAX_NOTES;
currentNote = 0;
resetControllers();
controllers.masterTune = 0;
controllers.opSwitch = 0x3f; // enable all operators
//controllers.opSwitch=0x00;
lastKeyDown = -1;
vuSignal = 0.0;
lfo.reset(data + 137);
setMonoMode(false);
sustain = false;
setEngineType(DEXED_ENGINE);
}
Dexed::~Dexed()
{
currentNote = -1;
for (uint8_t note = 0; note < MAX_ACTIVE_NOTES; note++)
delete voices[note].dx7_note;
delete(engineMsfa);
delete(engineOpl);
delete(engineMkI);
}
void Dexed::activate(void)
{
panic();
controllers.refresh();
}
void Dexed::deactivate(void)
{
panic();
}
void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
{
uint16_t i, j;
uint8_t note;
float sumbuf[n_samples];
float s;
const double decayFactor = 0.99992;
if (refreshVoice)
{
for (i = 0; i < max_notes; i++)
{
if ( voices[i].live )
voices[i].dx7_note->update(data, voices[i].midi_note, voices[i].velocity, voices[i].porta, &controllers);
}
lfo.reset(data + 137);
refreshVoice = false;
}
for (i = 0; i < n_samples; i += _N_)
{
AlignedBuf<int32_t, _N_> audiobuf;
for (uint8_t j = 0; j < _N_; ++j)
{
audiobuf.get()[j] = 0;
sumbuf[i + j] = 0.0;
}
int32_t lfovalue = lfo.getsample();
int32_t lfodelay = lfo.getdelay();
for (note = 0; note < max_notes; note++)
{
if (voices[note].live)
{
voices[note].dx7_note->compute(audiobuf.get(), lfovalue, lfodelay, &controllers);
for (j = 0; j < _N_; ++j)
{
sumbuf[i + j] += signed_saturate_rshift(audiobuf.get()[j] >> 4, 24, 9) / 32768.0;
audiobuf.get()[j] = 0;
/*
int32_t val = audiobuf.get()[j];
val = val >> 4;
int32_t clip_val = val < -(1 << 24) ? 0x8000 : val >= (1 << 24) ? 0x7fff : val >> 9;
float f = ((float) clip_val) / (float) 0x8000;
if ( f > 1.0 ) f = 1.0;
if ( f < -1.0 ) f = -1.0;
sumbuf[j] += f;
audiobuf.get()[j] = 0;
*/
}
}
}
}
fx.process(sumbuf, n_samples); // Needed for fx.Gain()!!!
// mild compression
for (i = 0; i < n_samples; i++)
{
s = abs(sumbuf[i]);
if (s > vuSignal)
vuSignal = s;
else if (vuSignal > 0.001f)
vuSignal *= decayFactor;
else
vuSignal = 0;
}
//arm_scale_f32(sumbuf, 0.00015, sumbuf, AUDIO_BLOCK_SAMPLES);
arm_float_to_q15(sumbuf, buffer, AUDIO_BLOCK_SAMPLES);
}
void Dexed::keydown(int16_t pitch, uint8_t velo) {
if ( velo == 0 ) {
keyup(pitch);
return;
}
pitch += data[144] - TRANSPOSE_FIX;
int previousKeyDown = lastKeyDown;
lastKeyDown = pitch;
int porta = -1;
if ( controllers.portamento_enable_cc && previousKeyDown >= 0 )
porta = controllers.portamento_cc;
uint8_t note = currentNote;
uint8_t keydown_counter = 0;
if (!monoMode && refreshMode)
{
for (uint8_t i = 0; i < max_notes; i++)
{
if (voices[i].midi_note == pitch && voices[i].keydown == false && voices[i].live && voices[i].sustained == true)
{
// retrigger or refresh note?
voices[i].dx7_note->keyup();
voices[i].midi_note = pitch;
voices[i].velocity = velo;
voices[i].keydown = true;
voices[i].sustained = sustain;
voices[i].live = true;
voices[i].dx7_note->init(data, pitch, velo, pitch, porta, &controllers);
voices[i].key_pressed_timer = millis();
return;
}
}
}
for (uint8_t i = 0; i <= max_notes; i++)
{
if (i == max_notes)
{
uint32_t min_timer = 0xffff;
if (monoMode)
break;
// no free sound slot found, so use the oldest note slot
for (uint8_t n = 0; n < max_notes; n++)
{
if (voices[n].key_pressed_timer < min_timer)
{
min_timer = voices[n].key_pressed_timer;
note = n;
}
}
voices[note].keydown = false;
voices[note].sustained = false;
voices[note].live = false;
voices[note].key_pressed_timer = 0;
keydown_counter--;
}
if (!voices[note].keydown)
{
currentNote = (note + 1) % max_notes;
voices[note].midi_note = pitch;
voices[note].velocity = velo;
voices[note].sustained = sustain;
voices[note].keydown = true;
int srcnote = (previousKeyDown >= 0) ? previousKeyDown : pitch;
voices[note].dx7_note->init(data, pitch, velo, srcnote, porta, &controllers);
if ( data[136] )
voices[note].dx7_note->oscSync();
voices[i].key_pressed_timer = millis();
keydown_counter++;
break;
}
else
{
keydown_counter++;
}
note = (note + 1) % max_notes;
}
if (keydown_counter == 0)
lfo.keydown();
if ( monoMode ) {
for (uint8_t i = 0; i < max_notes; i++) {
if ( voices[i].live ) {
// all keys are up, only transfer signal
if ( ! voices[i].keydown ) {
voices[i].live = false;
voices[note].dx7_note->transferSignal(*voices[i].dx7_note);
break;
}
if ( voices[i].midi_note < pitch ) {
voices[i].live = false;
voices[note].dx7_note->transferState(*voices[i].dx7_note);
break;
}
return;
}
}
}
voices[note].live = true;
}
void Dexed::keyup(int16_t pitch) {
uint8_t note;
pitch += data[144] - TRANSPOSE_FIX;
for (note = 0; note < max_notes; note++) {
if ( voices[note].midi_note == pitch && voices[note].keydown ) {
voices[note].keydown = false;
voices[note].key_pressed_timer = 0;
break;
}
}
// note not found ?
if ( note >= max_notes ) {
return;
}
if ( monoMode ) {
int16_t highNote = -1;
uint8_t target = 0;
for (int8_t i = 0; i < max_notes; i++) {
if ( voices[i].keydown && voices[i].midi_note > highNote ) {
target = i;
highNote = voices[i].midi_note;
}
}
if ( highNote != -1 && voices[note].live ) {
voices[note].live = false;
voices[note].key_pressed_timer = 0;
voices[target].live = true;
voices[target].dx7_note->transferState(*voices[note].dx7_note);
}
}
if ( sustain ) {
voices[note].sustained = true;
} else {
voices[note].dx7_note->keyup();
}
}
void Dexed::doRefreshVoice(void)
{
refreshVoice = true;
}
void Dexed::setOPs(uint8_t ops)
{
controllers.opSwitch = ops;
}
uint8_t Dexed::getEngineType() {
return engineType;
}
void Dexed::setEngineType(uint8_t tp) {
if (engineType == tp)
return;
switch (tp) {
case DEXED_ENGINE_MARKI:
controllers.core = engineMkI;
break;
case DEXED_ENGINE_OPL:
controllers.core = engineOpl;
break;
default:
controllers.core = engineMsfa;
tp = DEXED_ENGINE_MODERN;
break;
}
engineType = tp;
panic();
controllers.refresh();
}
bool Dexed::isMonoMode(void) {
return monoMode;
}
void Dexed::setMonoMode(bool mode) {
if (monoMode == mode)
return;
//panic();
notesOff();
monoMode = mode;
}
void Dexed::setRefreshMode(bool mode) {
refreshMode = mode;
}
void Dexed::setSustain(bool s)
{
if (sustain == s)
return;
sustain = s;
}
bool Dexed::getSustain(void)
{
return sustain;
}
void Dexed::panic(void)
{
for (uint8_t i = 0; i < MAX_ACTIVE_NOTES; i++)
{
if (voices[i].live == true) {
voices[i].keydown = false;
voices[i].live = false;
voices[i].sustained = false;
voices[i].key_pressed_timer = 0;
if ( voices[i].dx7_note != NULL ) {
voices[i].dx7_note->oscSync();
}
}
}
}
void Dexed::resetControllers(void)
{
controllers.values_[kControllerPitch] = 0x2000;
controllers.values_[kControllerPitchRange] = 0;
controllers.values_[kControllerPitchStep] = 0;
controllers.values_[kControllerPortamentoGlissando] = 0;
controllers.modwheel_cc = 0;
controllers.foot_cc = 0;
controllers.breath_cc = 0;
controllers.aftertouch_cc = 0;
controllers.portamento_enable_cc = false;
controllers.portamento_cc = 0;
controllers.refresh();
}
void Dexed::notesOff(void) {
for (uint8_t i = 0; i < MAX_ACTIVE_NOTES; i++) {
if (voices[i].live == true) {
voices[i].keydown = false;
voices[i].live = false;
}
}
}
void Dexed::setMaxNotes(uint8_t n) {
if (n <= MAX_ACTIVE_NOTES)
{
notesOff();
max_notes = n;
//panic();
controllers.refresh();
}
}
uint8_t Dexed::getMaxNotes(void)
{
return max_notes;
}
uint8_t Dexed::getNumNotesPlaying(void)
{
uint8_t op_carrier = controllers.core->get_carrier_operators(data[134]); // look for carriers
uint8_t i;
uint8_t count_playing_voices = 0;
for (i = 0; i < max_notes; i++)
{
if (voices[i].live == true)
{
uint8_t op_amp = 0;
uint8_t op_carrier_num = 0;
memset(&voiceStatus, 0, sizeof(VoiceStatus));
voices[i].dx7_note->peekVoiceStatus(voiceStatus);
for (uint8_t op = 0; op < 6; op++)
{
if ((op_carrier & (1 << op)))
{
// this voice is a carrier!
op_carrier_num++;
if (voiceStatus.amp[op] <= VOICE_SILENCE_LEVEL && voiceStatus.ampStep[op] == 4)
{
// this voice produces no audio output
op_amp++;
}
}
}
if (op_amp == op_carrier_num)
{
// all carrier-operators are silent -> disable the voice
voices[i].live = false;
voices[i].sustained = false;
voices[i].keydown = false;
#ifdef DEBUG
Serial.print(F("Shutdown voice: "));
Serial.println(i, DEC);
#endif
}
else
count_playing_voices++;
}
}
return (count_playing_voices);
}
bool Dexed::decodeVoice(uint8_t* encoded_data, uint8_t* new_data)
{
uint8_t* p_data = new_data;
uint8_t op;
uint8_t tmp;
char dexed_voice_name[11];
panic();
for (op = 0; op < 6; op++)
{
// DEXED_OP_EG_R1, // 0
// DEXED_OP_EG_R2, // 1
// DEXED_OP_EG_R3, // 2
// DEXED_OP_EG_R4, // 3
// DEXED_OP_EG_L1, // 4
// DEXED_OP_EG_L2, // 5
// DEXED_OP_EG_L3, // 6
// DEXED_OP_EG_L4, // 7
// DEXED_OP_LEV_SCL_BRK_PT, // 8
// DEXED_OP_SCL_LEFT_DEPTH, // 9
// DEXED_OP_SCL_RGHT_DEPTH, // 10
memcpy(&new_data[op * 21], &encoded_data[op * 17], 11);
tmp = encoded_data[(op * 17) + 11];
*(p_data + DEXED_OP_SCL_LEFT_CURVE + (op * 21)) = (tmp & 0x03);
*(p_data + DEXED_OP_SCL_RGHT_CURVE + (op * 21)) = (tmp & 0x0c) >> 2;
tmp = encoded_data[(op * 17) + 12];
*(p_data + DEXED_OP_OSC_DETUNE + (op * 21)) = (tmp & 0x78) >> 3;
*(p_data + DEXED_OP_OSC_RATE_SCALE + (op * 21)) = (tmp & 0x07);
tmp = encoded_data[(op * 17) + 13];
*(p_data + DEXED_OP_KEY_VEL_SENS + (op * 21)) = (tmp & 0x1c) >> 2;
*(p_data + DEXED_OP_AMP_MOD_SENS + (op * 21)) = (tmp & 0x03);
*(p_data + DEXED_OP_OUTPUT_LEV + (op * 21)) = encoded_data[(op * 17) + 14];
tmp = encoded_data[(op * 17) + 15];
*(p_data + DEXED_OP_FREQ_COARSE + (op * 21)) = (tmp & 0x3e) >> 1;
*(p_data + DEXED_OP_OSC_MODE + (op * 21)) = (tmp & 0x01);
*(p_data + DEXED_OP_FREQ_FINE + (op * 21)) = encoded_data[(op * 17) + 16];
}
// DEXED_PITCH_EG_R1, // 0
// DEXED_PITCH_EG_R2, // 1
// DEXED_PITCH_EG_R3, // 2
// DEXED_PITCH_EG_R4, // 3
// DEXED_PITCH_EG_L1, // 4
// DEXED_PITCH_EG_L2, // 5
// DEXED_PITCH_EG_L3, // 6
// DEXED_PITCH_EG_L4, // 7
memcpy(&new_data[DEXED_VOICE_OFFSET], &encoded_data[102], 8);
tmp = encoded_data[110];
*(p_data + DEXED_VOICE_OFFSET + DEXED_ALGORITHM) = (tmp & 0x1f);
tmp = encoded_data[111];
*(p_data + DEXED_VOICE_OFFSET + DEXED_OSC_KEY_SYNC) = (tmp & 0x08) >> 3;
*(p_data + DEXED_VOICE_OFFSET + DEXED_FEEDBACK) = (tmp & 0x07);
// DEXED_LFO_SPEED, // 11
// DEXED_LFO_DELAY, // 12
// DEXED_LFO_PITCH_MOD_DEP, // 13
// DEXED_LFO_AMP_MOD_DEP, // 14
memcpy(&new_data[DEXED_VOICE_OFFSET + DEXED_LFO_SPEED], &encoded_data[112], 4);
tmp = encoded_data[116];
*(p_data + DEXED_VOICE_OFFSET + DEXED_LFO_PITCH_MOD_SENS) = (tmp & 0x30) >> 4;
*(p_data + DEXED_VOICE_OFFSET + DEXED_LFO_WAVE) = (tmp & 0x0e) >> 1;
*(p_data + DEXED_VOICE_OFFSET + DEXED_LFO_SYNC) = (tmp & 0x01);
*(p_data + DEXED_VOICE_OFFSET + DEXED_TRANSPOSE) = encoded_data[117];
memcpy(&new_data[DEXED_VOICE_OFFSET + DEXED_NAME], &encoded_data[118], 10);
panic();
doRefreshVoice();
strncpy(dexed_voice_name, (char *)&encoded_data[118], sizeof(dexed_voice_name) - 1);
dexed_voice_name[10] = '\0';
#ifdef DEBUG
Serial.print(F("Voice ["));
Serial.print(dexed_voice_name);
Serial.println(F("] decoded."));
#endif
return (true);
}
bool Dexed::encodeVoice(uint8_t* encoded_data)
{
uint8_t* p_data = data;
uint8_t op;
for (op = 0; op < 6; op++)
{
// DEXED_OP_EG_R1, // 0
// DEXED_OP_EG_R2, // 1
// DEXED_OP_EG_R3, // 2
// DEXED_OP_EG_R4, // 3
// DEXED_OP_EG_L1, // 4
// DEXED_OP_EG_L2, // 5
// DEXED_OP_EG_L3, // 6
// DEXED_OP_EG_L4, // 7
// DEXED_OP_LEV_SCL_BRK_PT, // 8
// DEXED_OP_SCL_LEFT_DEPTH, // 9
// DEXED_OP_SCL_RGHT_DEPTH, // 10
memcpy(&encoded_data[op * 17], &data[op * 21], 11);
encoded_data[(op * 17) + 11] = ((*(p_data + DEXED_OP_SCL_RGHT_CURVE + (op * 21)) & 0x0c) << 2) | (*(p_data + DEXED_OP_SCL_LEFT_CURVE + (op * 21)) & 0x03);
encoded_data[(op * 17) + 12] = ((*(p_data + DEXED_OP_OSC_DETUNE + (op * 21)) & 0x0f) << 3) | (*(p_data + DEXED_OP_OSC_RATE_SCALE + (op * 21)) & 0x07);
encoded_data[(op * 17) + 13] = ((*(p_data + DEXED_OP_KEY_VEL_SENS + (op * 21)) & 0x07) << 2) | (*(p_data + DEXED_OP_AMP_MOD_SENS + (op * 21)) & 0x03);
encoded_data[(op * 17) + 14] = *(p_data + DEXED_OP_OUTPUT_LEV + (op * 21));
encoded_data[(op * 17) + 15] = ((*(p_data + DEXED_OP_FREQ_COARSE + (op * 21)) & 0x1f) << 1) | (*(p_data + DEXED_OP_OSC_MODE + (op * 21)) & 0x01);
encoded_data[(op * 17) + 16] = *(p_data + DEXED_OP_FREQ_FINE + (op * 21));
}
// DEXED_PITCH_EG_R1, // 0
// DEXED_PITCH_EG_R2, // 1
// DEXED_PITCH_EG_R3, // 2
// DEXED_PITCH_EG_R4, // 3
// DEXED_PITCH_EG_L1, // 4
// DEXED_PITCH_EG_L2, // 5
// DEXED_PITCH_EG_L3, // 6
// DEXED_PITCH_EG_L4, // 7
memcpy(&encoded_data[102], &data[DEXED_VOICE_OFFSET], 8);
encoded_data[110] = (*(p_data + DEXED_VOICE_OFFSET + DEXED_ALGORITHM) & 0x1f);
encoded_data[111] = (((*(p_data + DEXED_VOICE_OFFSET + DEXED_OSC_KEY_SYNC) & 0x01) << 3) | ((*(p_data + DEXED_VOICE_OFFSET + DEXED_FEEDBACK)) & 0x07));
// DEXED_LFO_SPEED, // 11
// DEXED_LFO_DELAY, // 12
// DEXED_LFO_PITCH_MOD_DEP, // 13
// DEXED_LFO_AMP_MOD_DEP, // 14
memcpy(&encoded_data[112], &data[DEXED_VOICE_OFFSET + DEXED_LFO_SPEED], 4);
encoded_data[116] = (((*(p_data + DEXED_VOICE_OFFSET + DEXED_LFO_PITCH_MOD_SENS) & 0x07) << 4) | (((*(p_data + DEXED_VOICE_OFFSET + DEXED_LFO_WAVE)) & 0x07) << 1) | ((*(p_data + DEXED_VOICE_OFFSET + DEXED_LFO_SYNC)) & 0x01));
encoded_data[117] = *(p_data + DEXED_VOICE_OFFSET + DEXED_TRANSPOSE);
memset(&encoded_data[118], 0, 10);
memcpy(&encoded_data[118], &data[DEXED_VOICE_OFFSET + DEXED_NAME], 10);
return (true);
}
bool Dexed::getVoiceData(uint8_t* data_copy)
{
memcpy(data_copy, data, sizeof(data));
return (true);
}
bool Dexed::loadVoiceParameters(uint8_t* new_data)
{
char dexed_voice_name[11];
panic();
memcpy(&data, new_data, 155);
doRefreshVoice();
//activate();
strncpy(dexed_voice_name, (char *)&new_data[145], sizeof(dexed_voice_name) - 1);
dexed_voice_name[10] = '\0';
#ifdef DEBUG
Serial.print(F("Voice ["));
Serial.print(dexed_voice_name);
Serial.println(F("] loaded."));
#endif
return (true);
}
void Dexed::setPBController(uint8_t pb_range, uint8_t pb_step)
{
#ifdef DEBUG
Serial.println(F("Dexed::setPBController"));
#endif
pb_range = constrain(pb_range, PB_RANGE_MIN, PB_RANGE_MAX);
pb_step = constrain(pb_step, PB_STEP_MIN, PB_STEP_MAX);
controllers.values_[kControllerPitchRange] = pb_range;
controllers.values_[kControllerPitchStep] = pb_step;
controllers.refresh();
}
void Dexed::setMWController(uint8_t mw_range, uint8_t mw_assign, uint8_t mw_mode)
{
#ifdef DEBUG
Serial.println(F("Dexed::setMWController"));
#endif
mw_range = constrain(mw_range, MW_RANGE_MIN, MW_RANGE_MAX);
mw_assign = constrain(mw_assign, MW_ASSIGN_MIN, MW_ASSIGN_MAX);
mw_mode = constrain(mw_mode, MW_MODE_MIN, MW_MODE_MAX);
controllers.wheel.setRange(mw_range);
controllers.wheel.setTarget(mw_assign);
controllers.wheel.setMode(mw_mode);
controllers.refresh();
}
void Dexed::setFCController(uint8_t fc_range, uint8_t fc_assign, uint8_t fc_mode)
{
#ifdef DEBUG
Serial.println(F("Dexed::setFCController"));
#endif
fc_range = constrain(fc_range, FC_RANGE_MIN, FC_RANGE_MAX);
fc_assign = constrain(fc_assign, FC_ASSIGN_MIN, FC_ASSIGN_MAX);
fc_mode = constrain(fc_mode, FC_MODE_MIN, FC_MODE_MAX);
controllers.foot.setRange(fc_range);
controllers.foot.setTarget(fc_assign);
controllers.foot.setMode(fc_mode);
controllers.refresh();
}
void Dexed::setBCController(uint8_t bc_range, uint8_t bc_assign, uint8_t bc_mode)
{
#ifdef DEBUG
Serial.println(F("Dexed::setBCController"));
#endif
bc_range = constrain(bc_range, BC_RANGE_MIN, BC_RANGE_MAX);
bc_assign = constrain(bc_assign, BC_ASSIGN_MIN, BC_ASSIGN_MAX);
bc_mode = constrain(bc_mode, BC_MODE_MIN, BC_MODE_MAX);
controllers.breath.setRange(bc_range);
controllers.breath.setTarget(bc_assign);
controllers.breath.setMode(bc_mode);
controllers.refresh();
}
void Dexed::setATController(uint8_t at_range, uint8_t at_assign, uint8_t at_mode)
{
#ifdef DEBUG
Serial.println(F("Dexed::setATController"));
#endif
at_range = constrain(at_range, AT_RANGE_MIN, AT_RANGE_MAX);
at_assign = constrain(at_assign, AT_ASSIGN_MIN, AT_ASSIGN_MAX);
at_mode = constrain(at_mode, AT_MODE_MIN, AT_MODE_MAX);
controllers.at.setRange(at_range);
controllers.at.setTarget(at_assign);
controllers.at.setMode(at_mode);
controllers.refresh();
}
void Dexed::setPortamentoMode(uint8_t portamento_mode, uint8_t portamento_glissando, uint8_t portamento_time)
{
controllers.portamento_cc = portamento_time;
if (portamento_time > 0)
controllers.portamento_enable_cc = true;
else
controllers.portamento_enable_cc = false;
controllers.values_[kControllerPortamentoGlissando] = portamento_glissando;
controllers.refresh();
}
/*
// https://www.musicdsp.org/en/latest/Effects/169-compressor.html#
void compress
(
float* wav_in, // signal
int n, // N samples
double threshold, // threshold (percents)
double slope, // slope angle (percents)
int sr, // sample rate (smp/sec)
double tla, // lookahead (ms)
double twnd, // window time (ms)
double tatt, // attack time (ms)
double trel // release time (ms)
)
{
typedef float stereodata[2];
stereodata* wav = (stereodata*) wav_in; // our stereo signal
threshold *= 0.01; // threshold to unity (0...1)
slope *= 0.01; // slope to unity
tla *= 1e-3; // lookahead time to seconds
twnd *= 1e-3; // window time to seconds
tatt *= 1e-3; // attack time to seconds
trel *= 1e-3; // release time to seconds
// attack and release "per sample decay"
double att = (tatt == 0.0) ? (0.0) : exp (-1.0 / (sr * tatt));
double rel = (trel == 0.0) ? (0.0) : exp (-1.0 / (sr * trel));
// envelope
double env = 0.0;
// sample offset to lookahead wnd start
int lhsmp = (int) (sr * tla);
// samples count in lookahead window
int nrms = (int) (sr * twnd);
// for each sample...
for (int i = 0; i < n; ++i)
{
// now compute RMS
double summ = 0;
// for each sample in window
for (int j = 0; j < nrms; ++j)
{
int lki = i + j + lhsmp;
double smp;
// if we in bounds of signal?
// if so, convert to mono
if (lki < n)
smp = 0.5 * wav[lki][0] + 0.5 * wav[lki][1];
else
smp = 0.0; // if we out of bounds we just get zero in smp
summ += smp * smp; // square em..
}
double rms = sqrt (summ / nrms); // root-mean-square
// dynamic selection: attack or release?
double theta = rms > env ? att : rel;
// smoothing with capacitor, envelope extraction...
// here be aware of pIV denormal numbers glitch
env = (1.0 - theta) * rms + theta * env;
// the very easy hard knee 1:N compressor
double gain = 1.0;
if (env > threshold)
gain = gain - (env - threshold) * slope;
// result - two hard kneed compressed channels...
float leftchannel = wav[i][0] * gain;
float rightchannel = wav[i][1] * gain;
}
}
*/