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dx7note.cc
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dx7note.cc
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/*
* Copyright 2016 Pascal Gauthier.
* Copyright 2012 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <math.h>
#include <stdlib.h>
#include "synth.h"
#include "freqlut.h"
#include "exp2.h"
#include "controllers.h"
#include "dx7note.h"
int32_t midinote_to_logfreq(int midinote) {
const int base = 50857777; // (1 << 24) * (log(440) / log(2) - 69/12)
const int step = (1 << 24) / 12;
return base + step * midinote;
}
const int32_t coarsemul[] = {
-16777216, 0, 16777216, 26591258, 33554432, 38955489, 43368474, 47099600,
50331648, 53182516, 55732705, 58039632, 60145690, 62083076, 63876816,
65546747, 67108864, 68576247, 69959732, 71268397, 72509921, 73690858,
74816848, 75892776, 76922906, 77910978, 78860292, 79773775, 80654032,
81503396, 82323963, 83117622
};
int32_t osc_freq(int midinote, int mode, int coarse, int fine, int detune) {
// TODO: pitch randomization
int32_t logfreq;
if (mode == 0) {
logfreq = midinote_to_logfreq(midinote);
logfreq += coarsemul[coarse & 31];
if (fine) {
// (1 << 24) / log(2)
logfreq += (int32_t)floor(24204406.323123 * log(1 + 0.01 * fine) + 0.5);
}
// This was measured at 7.213Hz per count at 9600Hz, but the exact
// value is somewhat dependent on midinote. Close enough for now.
logfreq += 12606 * (detune - 7);
} else {
// ((1 << 24) * log(10) / log(2) * .01) << 3
logfreq = (4458616 * ((coarse & 3) * 100 + fine)) >> 3;
logfreq += detune > 7 ? 13457 * (detune - 7) : 0;
}
return logfreq;
}
const uint8_t velocity_data[64] = {
0, 70, 86, 97, 106, 114, 121, 126, 132, 138, 142, 148, 152, 156, 160, 163,
166, 170, 173, 174, 178, 181, 184, 186, 189, 190, 194, 196, 198, 200, 202,
205, 206, 209, 211, 214, 216, 218, 220, 222, 224, 225, 227, 229, 230, 232,
233, 235, 237, 238, 240, 241, 242, 243, 244, 246, 246, 248, 249, 250, 251,
252, 253, 254
};
// See "velocity" section of notes. Returns velocity delta in microsteps.
int ScaleVelocity(int velocity, int sensitivity) {
int clamped_vel = max(0, min(127, velocity));
int vel_value = velocity_data[clamped_vel >> 1] - 239;
int scaled_vel = ((sensitivity * vel_value + 7) >> 3) << 4;
return scaled_vel;
}
int ScaleRate(int midinote, int sensitivity) {
int x = min(31, max(0, midinote / 3 - 7));
int qratedelta = (sensitivity * x) >> 3;
#ifdef SUPER_PRECISE
int rem = x & 7;
if (sensitivity == 3 && rem == 3) {
qratedelta -= 1;
} else if (sensitivity == 7 && rem > 0 && rem < 4) {
qratedelta += 1;
}
#endif
return qratedelta;
}
const uint8_t exp_scale_data[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 14, 16, 19, 23, 27, 33, 39, 47, 56, 66,
80, 94, 110, 126, 142, 158, 174, 190, 206, 222, 238, 250
};
int ScaleCurve(int group, int depth, int curve) {
int scale;
if (curve == 0 || curve == 3) {
// linear
scale = (group * depth * 329) >> 12;
} else {
// exponential
int n_scale_data = sizeof(exp_scale_data);
int raw_exp = exp_scale_data[min(group, n_scale_data - 1)];
scale = (raw_exp * depth * 329) >> 15;
}
if (curve < 2) {
scale = -scale;
}
return scale;
}
int ScaleLevel(int midinote, int break_pt, int left_depth, int right_depth,
int left_curve, int right_curve) {
int offset = midinote - break_pt - 17;
if (offset >= 0) {
return ScaleCurve(offset / 3, right_depth, right_curve);
} else {
return ScaleCurve((-offset) / 3, left_depth, left_curve);
}
}
static const uint8_t pitchmodsenstab[] = {
0, 10, 20, 33, 55, 92, 153, 255
};
// 0, 66, 109, 255
static const uint32_t ampmodsenstab[] = {
0, 4342338, 7171437, 16777216
};
Dx7Note::Dx7Note() {
for(int op=0;op<6;op++) {
params_[op].phase = 0;
params_[op].gain_out = 0;
}
}
void Dx7Note::init(const uint8_t patch[156], int midinote, int velocity, int fb_depth) {
int rates[4];
int levels[4];
for (int op = 0; op < 6; op++) {
int off = op * 21;
for (int i = 0; i < 4; i++) {
rates[i] = patch[off + i];
levels[i] = patch[off + 4 + i];
}
int outlevel = patch[off + 16];
outlevel = Env::scaleoutlevel(outlevel);
int level_scaling = ScaleLevel(midinote, patch[off + 8], patch[off + 9],
patch[off + 10], patch[off + 11], patch[off + 12]);
outlevel += level_scaling;
outlevel = min(127, outlevel);
outlevel = outlevel << 5;
outlevel += ScaleVelocity(velocity, patch[off + 15]);
outlevel = max(0, outlevel);
int rate_scaling = ScaleRate(midinote, patch[off + 13]);
env_[op].init(rates, levels, outlevel, rate_scaling);
int mode = patch[off + 17];
int coarse = patch[off + 18];
int fine = patch[off + 19];
int detune = patch[off + 20];
int32_t freq = osc_freq(midinote, mode, coarse, fine, detune);
basepitch_[op] = freq;
ampmodsens_[op] = ampmodsenstab[patch[off + 14] & 3];
}
for (int i = 0; i < 4; i++) {
rates[i] = patch[126 + i];
levels[i] = patch[130 + i];
}
pitchenv_.set(rates, levels);
algorithm_ = patch[134];
int feedback = patch[135];
fb_shift_ = feedback != 0 ? fb_depth - feedback : 16;
pitchmoddepth_ = (patch[139] * 165) >> 6;
pitchmodsens_ = pitchmodsenstab[patch[143] & 7];
ampmoddepth_ = (patch[140] * 165) >> 6;
}
void Dx7Note::compute(int32_t *buf, int32_t lfo_val, int32_t lfo_delay, const Controllers *ctrls) {
// ==== PITCH ====
uint32_t pmd = pitchmoddepth_ * lfo_delay; // Q32
int32_t senslfo = pitchmodsens_ * (lfo_val - (1 << 23));
int32_t pmod_1 = (((int64_t) pmd) * (int64_t) senslfo) >> 39;
pmod_1 = abs(pmod_1);
int32_t pmod_2 = ((int64_t)ctrls->pitch_mod * (int64_t)senslfo) >> 14;
pmod_2 = abs(pmod_2);
int32_t pitch_mod = max(pmod_1, pmod_2);
pitch_mod = pitchenv_.getsample() + (pitch_mod * (senslfo < 0 ? -1 : 1));
// ---- PITCH BEND ----
int pitchbend = ctrls->values_[kControllerPitch];
int32_t pb = (pitchbend - 0x2000);
if (pb != 0) {
if (ctrls->values_[kControllerPitchStep] == 0) {
pb = ((float) (pb << 11)) * ((float) ctrls->values_[kControllerPitchRange]) / 12.0;
} else {
int stp = 12 / ctrls->values_[kControllerPitchStep];
pb = pb * stp / 8191;
pb = (pb * (8191 / stp)) << 11;
}
}
pitch_mod += pb;
// ==== AMP MOD ====
uint32_t amod_1 = ((int64_t) ampmoddepth_ * (int64_t) lfo_delay) >> 8; // Q24 :D
amod_1 = ((int64_t) amod_1 * (int64_t) lfo_val) >> 24;
uint32_t amod_2 = ((int64_t) ctrls->amp_mod * (int64_t) lfo_val) >> 7; // Q?? :|
uint32_t amd_mod = max(amod_1, amod_2);
// ==== EG AMP MOD ====
uint32_t amod_3 = (ctrls->eg_mod+1) << 16;
amd_mod = max((1<<23) - amod_3, amd_mod);
// ==== OP RENDER ====
for (int op = 0; op < 6; op++) {
//int32_t gain = pow(2, 10 + level * (1.0 / (1 << 24)));
params_[op].freq = Freqlut::lookup(basepitch_[op] + pitch_mod);
int32_t level = env_[op].getsample();
if (ampmodsens_[op] != 0) {
uint32_t sensamp = ((uint64_t) amd_mod) * ((uint64_t) ampmodsens_[op]) >> 24;
// TODO: mehhh.. this needs some real tuning.
uint32_t pt = exp(((float)sensamp)/262144 * 0.07 + 12.2);
uint32_t ldiff = ((uint64_t)level) * (((uint64_t)pt<<4)) >> 28;
level -= ldiff;
}
params_[op].level_in = level;
}
ctrls->core->render(buf, params_, algorithm_, fb_buf_, fb_shift_);
}
void Dx7Note::keyup() {
for (int op = 0; op < 6; op++) {
env_[op].keydown(false);
pitchenv_.keydown(false);
}
}
void Dx7Note::update(const uint8_t patch[156], int midinote, int fb_depth) {
for (int op = 0; op < 6; op++) {
int off = op * 21;
int mode = patch[off + 17];
int coarse = patch[off + 18];
int fine = patch[off + 19];
int detune = patch[off + 20];
basepitch_[op] = osc_freq(midinote, mode, coarse, fine, detune);
ampmodsens_[op] = ampmodsenstab[patch[off + 14] & 3];
}
algorithm_ = patch[134];
int feedback = patch[135];
fb_shift_ = feedback != 0 ? 11 - feedback : 16;
pitchmoddepth_ = (patch[139] * 165) >> 6;
pitchmodsens_ = pitchmodsenstab[patch[143] & 7];
ampmoddepth_ = (patch[140] * 165) >> 6;
}
void Dx7Note::peekVoiceStatus(VoiceStatus &status) {
for(int i=0;i<6;i++) {
status.amp[i] = Exp2::lookup(params_[i].level_in - (14 * (1 << 24)));
env_[i].getPosition(&status.ampStep[i]);
}
pitchenv_.getPosition(&status.pitchStep);
}
/**
* Used in monophonic mode to transfert voice state from different notes
*/
void Dx7Note::transferState(Dx7Note &src) {
for (int i=0;i<6;i++) {
env_[i].transfer(src.env_[i]);
params_[i].gain_out = src.params_[i].gain_out;
params_[i].phase = src.params_[i].phase;
}
}
void Dx7Note::transferSignal(Dx7Note &src) {
for (int i=0;i<6;i++) {
params_[i].gain_out = src.params_[i].gain_out;
params_[i].phase = src.params_[i].phase;
}
}
void Dx7Note::oscSync() {
for (int i=0;i<6;i++) {
params_[i].gain_out = 0;
params_[i].phase = 0;
}
}