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MicroMDAEPiano
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MicroMDAEPiano/mdaEPiano.cpp

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/*
MicroMDAEPiano
MicroMDAEPiano is a port of the MDA-EPiano sound engine
(https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.
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"
#ifdef USE_XFADE_DATA
#include "mdaEPianoDataXfade.h"
#else
#include "mdaEPianoData.h"
#endif
#include "mdaEPiano.h"
#include <stdio.h>
#include <math.h>
mdaEPiano::mdaEPiano() // mdaEPiano::mdaEPiano(audioMasterCallback audioMaster) : AudioEffectX(audioMaster, NPROGS, NPARAMS)
{
Fs = SAMPLE_RATE; iFs = 1.0f / Fs; //just in case...
programs = new mdaEPianoProgram[NPROGS];
if (programs)
{
//fill patches...
int32_t i = 0;
fillpatch(i++, "Default", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
fillpatch(i++, "Bright", 0.500f, 0.500f, 1.000f, 0.800f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.500f);
fillpatch(i++, "Mellow", 0.500f, 0.500f, 0.000f, 0.000f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.246f, 0.000f);
fillpatch(i++, "Autopan", 0.500f, 0.500f, 0.500f, 0.500f, 0.250f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.246f, 0.000f);
fillpatch(i++, "Tremolo", 0.500f, 0.500f, 0.500f, 0.500f, 0.750f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.246f, 0.000f);
fillpatch(i++, "(default)", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
fillpatch(i++, "(default)", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
fillpatch(i++, "(default)", 0.500f, 0.500f, 0.500f, 0.500f, 0.500f, 0.650f, 0.250f, 0.500f, 1.0f, 0.500f, 0.146f, 0.000f);
setProgram(0);
}
waves = (short*)epianoDataXfade;
//Waveform data and keymapping
kgrp[ 0].root = 36; kgrp[ 0].high = 39; //C1
kgrp[ 3].root = 43; kgrp[ 3].high = 45; //G1
kgrp[ 6].root = 48; kgrp[ 6].high = 51; //C2
kgrp[ 9].root = 55; kgrp[ 9].high = 57; //G2
kgrp[12].root = 60; kgrp[12].high = 63; //C3
kgrp[15].root = 67; kgrp[15].high = 69; //G3
kgrp[18].root = 72; kgrp[18].high = 75; //C4
kgrp[21].root = 79; kgrp[21].high = 81; //G4
kgrp[24].root = 84; kgrp[24].high = 87; //C5
kgrp[27].root = 91; kgrp[27].high = 93; //G5
kgrp[30].root = 96; kgrp[30].high = 999; //C6
kgrp[0].pos = 0; kgrp[0].end = 8476; kgrp[0].loop = 4400;
kgrp[1].pos = 8477; kgrp[1].end = 16248; kgrp[1].loop = 4903;
kgrp[2].pos = 16249; kgrp[2].end = 34565; kgrp[2].loop = 6398;
kgrp[3].pos = 34566; kgrp[3].end = 41384; kgrp[3].loop = 3938;
kgrp[4].pos = 41385; kgrp[4].end = 45760; kgrp[4].loop = 1633; //was 1636;
kgrp[5].pos = 45761; kgrp[5].end = 65211; kgrp[5].loop = 5245;
kgrp[6].pos = 65212; kgrp[6].end = 72897; kgrp[6].loop = 2937;
kgrp[7].pos = 72898; kgrp[7].end = 78626; kgrp[7].loop = 2203; //was 2204;
kgrp[8].pos = 78627; kgrp[8].end = 100387; kgrp[8].loop = 6368;
kgrp[9].pos = 100388; kgrp[9].end = 116297; kgrp[9].loop = 10452;
kgrp[10].pos = 116298; kgrp[10].end = 127661; kgrp[10].loop = 5217; //was 5220;
kgrp[11].pos = 127662; kgrp[11].end = 144113; kgrp[11].loop = 3099;
kgrp[12].pos = 144114; kgrp[12].end = 152863; kgrp[12].loop = 4284;
kgrp[13].pos = 152864; kgrp[13].end = 173107; kgrp[13].loop = 3916;
kgrp[14].pos = 173108; kgrp[14].end = 192734; kgrp[14].loop = 2937;
kgrp[15].pos = 192735; kgrp[15].end = 204598; kgrp[15].loop = 4732;
kgrp[16].pos = 204599; kgrp[16].end = 218995; kgrp[16].loop = 4733;
kgrp[17].pos = 218996; kgrp[17].end = 233801; kgrp[17].loop = 2285;
kgrp[18].pos = 233802; kgrp[18].end = 248011; kgrp[18].loop = 4098;
kgrp[19].pos = 248012; kgrp[19].end = 265287; kgrp[19].loop = 4099;
kgrp[20].pos = 265288; kgrp[20].end = 282255; kgrp[20].loop = 3609;
kgrp[21].pos = 282256; kgrp[21].end = 293776; kgrp[21].loop = 2446;
kgrp[22].pos = 293777; kgrp[22].end = 312566; kgrp[22].loop = 6278;
kgrp[23].pos = 312567; kgrp[23].end = 330200; kgrp[23].loop = 2283;
kgrp[24].pos = 330201; kgrp[24].end = 348889; kgrp[24].loop = 2689;
kgrp[25].pos = 348890; kgrp[25].end = 365675; kgrp[25].loop = 4370;
kgrp[26].pos = 365676; kgrp[26].end = 383661; kgrp[26].loop = 5225;
kgrp[27].pos = 383662; kgrp[27].end = 393372; kgrp[27].loop = 2811;
kgrp[28].pos = 383662; kgrp[28].end = 393372; kgrp[28].loop = 2811; //ghost
kgrp[29].pos = 393373; kgrp[29].end = 406045; kgrp[29].loop = 4522;
kgrp[30].pos = 406046; kgrp[30].end = 414486; kgrp[30].loop = 2306;
kgrp[31].pos = 406046; kgrp[31].end = 414486; kgrp[31].loop = 2306; //ghost
kgrp[32].pos = 414487; kgrp[32].end = 422408; kgrp[32].loop = 2169;
//initialise...
for (int32_t v = 0; v < NVOICES; v++)
{
voice[v].env = 0.0f;
voice[v].dec = 0.99f; //all notes off
}
volume = 0.2f;
muff = 160.0f;
sustain = activevoices = 0;
tl = tr = lfo0 = dlfo = 0.0f;
lfo1 = 1.0f;
guiUpdate = 0;
vol = VOLUME;
update();
// suspend();
}
void mdaEPiano::update() //parameter change
{
float * param = programs[curProgram].param;
size = (int32_t)(12.0f * param[2] - 6.0f);
treb = 4.0f * param[3] * param[3] - 1.0f; //treble gain
if (param[3] > 0.5f) tfrq = 14000.0f; else tfrq = 5000.0f; //treble freq
tfrq = 1.0f - (float)exp(-iFs * tfrq);
rmod = lmod = param[4] + param[4] - 1.0f; //lfo depth
if (param[4] < 0.5f) rmod = -rmod;
dlfo = 6.283f * iFs * (float)exp(6.22f * param[5] - 2.61f); //lfo rate
velsens = 1.0f + param[6] + param[6];
if (param[6] < 0.25f) velsens -= 0.75f - 3.0f * param[6];
width = 0.03f * param[7];
fine = param[9] - 0.5f;
random = 0.077f * param[10] * param[10];
stretch = 0.0f; //0.000434f * (param[11] - 0.5f); parameter re-used for overdrive!
overdrive = 1.8f * param[11];
}
void mdaEPiano::resume()
{
Fs = SAMPLE_RATE;
iFs = 1.0f / Fs;
dlfo = 6.283f * iFs * (float)exp(6.22f * programs[curProgram].param[5] - 2.61f); //lfo rate
}
mdaEPiano::~mdaEPiano () //destroy any buffers...
{
if (programs) delete [] programs;
}
void mdaEPiano::setProgram(int32_t program)
{
curProgram = program;
update();
}
void mdaEPiano::setParameter(int32_t index, float value)
{
programs[curProgram].param[index] = value;
update();
}
void mdaEPiano::fillpatch(int32_t p, char *name, float p0, float p1, float p2, float p3, float p4,
float p5, float p6, float p7, float p8, float p9, float p10, float p11)
{
strcpy(programs[p].name, name);
programs[p].param[0] = p0; programs[p].param[1] = p1;
programs[p].param[2] = p2; programs[p].param[3] = p3;
programs[p].param[4] = p4; programs[p].param[5] = p5;
programs[p].param[6] = p6; programs[p].param[7] = p7;
programs[p].param[8] = p8; programs[p].param[9] = p9;
programs[p].param[10] = p10; programs[p].param[11] = p11;
}
float mdaEPiano::getParameter(int32_t index) {
return programs[curProgram].param[index];
}
void mdaEPiano::process(int16_t* outputs_r, int16_t* outputs_l)
{
int16_t v;
float x, l, r, od = overdrive;
int32_t i;
int16_t frame;
for (frame = 0; frame < AUDIO_BLOCK_SAMPLES; frame++)
{
VOICE *V = voice;
l = r = 0.0f;
for (v = 0; v < activevoices; v++)
{
V->frac += V->delta; //integer-based linear interpolation
V->pos += V->frac >> 16;
V->frac &= 0xFFFF;
if (V->pos > V->end)
V->pos -= V->loop;
i = waves[V->pos] + ((V->frac * (waves[V->pos + 1] - waves[V->pos])) >> 16);
x = V->env * static_cast<float>(i) / 32768.0f;
V->env = V->env * V->dec; //envelope
if (x > 0.0f)
{
x -= od * x * x; //overdrive
if (x < -V->env) x = -V->env;
}
l += V->outl * x;
r += V->outr * x;
V++;
}
tl += tfrq * (l - tl); //treble boost
tr += tfrq * (r - tr);
r += treb * (r - tr);
l += treb * (l - tl);
lfo0 += dlfo * lfo1; //LFO for tremolo and autopan
lfo1 -= dlfo * lfo0;
l += l * lmod * lfo1;
r += r * rmod * lfo1; //worth making all these local variables?
r *= 0.5;
l *= 0.5;
if (r > 1.0)
r = 1.0;
else if (r < -1.0)
r = -1.0;
if (l > 1.0)
l = 1.0;
else if (l < -1.0)
l = -1.0;
outputs_l[frame] = static_cast<int16_t>(l * configuration._loudness * 0x7fff) >> REDUCE_LOUDNESS;
outputs_r[frame] = static_cast<int16_t>(r * configuration._loudness * 0x7fff) >> REDUCE_LOUDNESS;
}
if (fabs(tl) < 1.0e-10) tl = 0.0f; //anti-denormal
if (fabs(tr) < 1.0e-10) tr = 0.0f;
for (v = 0; v < activevoices; v++)
if (voice[v].env < SILENCE)
voice[v] = voice[--activevoices];
}
void mdaEPiano::noteOn(int32_t note, int32_t velocity)
{
float * param = programs[curProgram].param;
float l = 99.0f;
int32_t v, vl = 0, k, s;
if (velocity > 0)
{
if (activevoices < NVOICES) //add a note
{
vl = activevoices;
activevoices++;
voice[vl].f0 = voice[vl].f1 = 0.0f;
}
else //steal a note
{
for (v = 0; v < NVOICES; v++) //find quietest voice
{
if (voice[v].env < l) {
l = voice[v].env;
vl = v;
}
}
}
k = (note - 60) * (note - 60);
l = fine + random * ((float)(k % 13) - 6.5f); //random & fine tune
if (note > 60) l += stretch * (float)k; //stretch
s = size;
//if(velocity > 40) s += (int32_t)(sizevel * (float)(velocity - 40)); - no velocity to hardness in ePiano
k = 0;
while (note > (kgrp[k].high + s)) k += 3; //find keygroup
l += (float)(note - kgrp[k].root); //pitch
l = 32000.0f * iFs * (float)exp(0.05776226505 * l);
voice[vl].delta = (int32_t)(65536.0f * l);
voice[vl].frac = 0;
if (velocity > 48) k++; //mid velocity sample
if (velocity > 80) k++; //high velocity sample
voice[vl].pos = kgrp[k].pos;
voice[vl].end = kgrp[k].end - 1;
voice[vl].loop = kgrp[k].loop;
voice[vl].env = (3.0f + 2.0f * velsens) * (float)pow(0.0078f * velocity, velsens); //velocity
if (note > 60) voice[vl].env *= (float)exp(0.01f * (float)(60 - note)); //new! high notes quieter
l = 50.0f + param[4] * param[4] * muff + muffvel * (float)(velocity - 64); //muffle
if (l < (55.0f + 0.4f * (float)note)) l = 55.0f + 0.4f * (float)note;
if (l > 210.0f) l = 210.0f;
voice[vl].ff = l * l * iFs;
voice[vl].note = note; //note->pan
if (note < 12) note = 12;
if (note > 108) note = 108;
l = volume;
voice[vl].outr = l + l * width * (float)(note - 60);
voice[vl].outl = l + l - voice[vl].outr;
if (note < 44) note = 44; //limit max decay length
voice[vl].dec = (float)exp(-iFs * exp(-1.0 + 0.03 * (double)note - 2.0f * param[0]));
}
else //note off
{
for (v = 0; v < NVOICES; v++) if (voice[v].note == note) //any voices playing that note?
{
if (sustain == 0)
{
voice[v].dec = (float)exp(-iFs * exp(6.0 + 0.01 * (double)note - 5.0 * param[1]));
}
else voice[v].note = SUSTAIN;
}
}
}
bool mdaEPiano::processMidiController(uint8_t data1, uint8_t data2)
{
float* param = programs[curProgram].param;
switch (data1)
{
case 0x01: //mod wheel
modwhl = 0.0078f * (float)(data2);
if (modwhl > 0.05f) //over-ride pan/trem depth
{
rmod = lmod = modwhl; //lfo depth
if (param[4] < 0.5f) rmod = -rmod;
}
break;
case 0x07: //volume
volume = 0.00002f * (float)(data2 * data2);
break;
case 0x40: //sustain pedal
case 0x42: //sustenuto pedal
sustain = data2 & 0x40;
if (sustain == 0)
{
noteOn(SUSTAIN, 0); //end all sustained notes
}
break;
default: //all notes off
if (data1 > 0x7A)
{
for (int32_t v = 0; v < NVOICES; v++) voice[v].dec = 0.99f;
sustain = 0;
muff = 160.0f;
}
break;
}
return (true);
}