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/*
* ZamComp mono compressor
* Copyright (C) 2014 Damien Zammit <damien@zamaudio.com>
*
* 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 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.
*
* For a full copy of the GNU General Public License see the doc/GPL.txt file.
*/
#include "ZamCompPlugin.hpp"
START_NAMESPACE_DISTRHO
// -----------------------------------------------------------------------
ZamCompPlugin::ZamCompPlugin()
: Plugin(paramCount, 3, 0)
{
// set default values
loadProgram(0);
}
// -----------------------------------------------------------------------
// Init
void ZamCompPlugin::initParameter(uint32_t index, Parameter& parameter)
{
switch (index)
{
case paramAttack:
parameter.hints = kParameterIsAutomable;
parameter.name = "Attack";
parameter.symbol = "att";
parameter.unit = "ms";
parameter.ranges.def = 10.0f;
parameter.ranges.min = 0.1f;
parameter.ranges.max = 100.0f;
break;
case paramRelease:
parameter.hints = kParameterIsAutomable;
parameter.name = "Release";
parameter.symbol = "rel";
parameter.unit = "ms";
parameter.ranges.def = 80.0f;
parameter.ranges.min = 1.0f;
parameter.ranges.max = 500.0f;
break;
case paramKnee:
parameter.hints = kParameterIsAutomable;
parameter.name = "Knee";
parameter.symbol = "kn";
parameter.unit = "dB";
parameter.ranges.def = 0.0f;
parameter.ranges.min = 0.0f;
parameter.ranges.max = 8.0f;
break;
case paramRatio:
parameter.hints = kParameterIsAutomable | kParameterIsLogarithmic;
parameter.name = "Ratio";
parameter.symbol = "rat";
parameter.unit = " ";
parameter.ranges.def = 4.0f;
parameter.ranges.min = 1.0f;
parameter.ranges.max = 20.0f;
break;
case paramThresh:
parameter.hints = kParameterIsAutomable;
parameter.name = "Threshold";
parameter.symbol = "thr";
parameter.unit = "dB";
parameter.ranges.def = 0.0f;
parameter.ranges.min = -80.0f;
parameter.ranges.max = 0.0f;
break;
case paramMakeup:
parameter.hints = kParameterIsAutomable;
parameter.name = "Makeup";
parameter.symbol = "mak";
parameter.unit = "dB";
parameter.ranges.def = 0.0f;
parameter.ranges.min = 0.0f;
parameter.ranges.max = 30.0f;
break;
case paramSlew:
parameter.hints = kParameterIsAutomable;
parameter.name = "Slew";
parameter.symbol = "slew";
parameter.unit = " ";
parameter.ranges.def = 1.0f;
parameter.ranges.min = 1.0f;
parameter.ranges.max = 150.0f;
break;
case paramSidechain:
parameter.hints = kParameterIsAutomable | kParameterIsBoolean;
parameter.name = "Sidechain";
parameter.symbol = "sidech";
parameter.unit = " ";
parameter.ranges.def = 0.0f;
parameter.ranges.min = 0.0f;
parameter.ranges.max = 1.0f;
break;
case paramGainRed:
parameter.hints = kParameterIsOutput;
parameter.name = "Gain Reduction";
parameter.symbol = "gr";
parameter.unit = "dB";
parameter.ranges.def = 0.0f;
parameter.ranges.min = 0.0f;
parameter.ranges.max = 20.0f;
break;
case paramOutputLevel:
parameter.hints = kParameterIsOutput;
parameter.name = "Output Level";
parameter.symbol = "outlevel";
parameter.unit = "dB";
parameter.ranges.def = -45.0f;
parameter.ranges.min = -45.0f;
parameter.ranges.max = 20.0f;
break;
}
}
void ZamCompPlugin::initAudioPort(bool input, uint32_t index, AudioPort& port)
{
Plugin::initAudioPort(input, index, port);
if ((index == 1) && input) {
port.hints |= kAudioPortIsSidechain;
port.name = "Sidechain Input";
port.symbol = "sidechain_in";
}
}
void ZamCompPlugin::initProgramName(uint32_t index, String& programName)
{
switch(index) {
case 0:
programName = "Zero";
break;
case 1:
programName = "PoppySnare";
break;
case 2:
programName = "VocalLeveller";
break;
}
}
void ZamCompPlugin::loadProgram(uint32_t index)
{
switch(index) {
case 0:
attack = 10.0;
release = 80.0;
knee = 0.0;
ratio = 4.0;
thresdb = 0.0;
makeup = 0.0;
gainred = 0.0;
slewfactor = 1.0;
outlevel = -45.0;
sidechain = 0.0;
break;
case 1:
attack = 10.0;
release = 10.0;
knee = 1.0;
ratio = 5.0;
thresdb = -18.0;
makeup = 6.0;
gainred = 0.0;
slewfactor = 20.0;
outlevel = -45.0;
sidechain = 0.0;
break;
case 2:
attack = 50.0;
release = 400.0;
knee = 8.0;
ratio = 5.0;
thresdb = -16.0;
makeup = 9.0;
gainred = 0.0;
slewfactor = 1.0;
outlevel = -45.0;
sidechain = 0.0;
break;
}
activate();
}
// -----------------------------------------------------------------------
// Internal data
float ZamCompPlugin::getParameterValue(uint32_t index) const
{
switch (index)
{
case paramAttack:
return attack;
break;
case paramRelease:
return release;
break;
case paramKnee:
return knee;
break;
case paramRatio:
return ratio;
break;
case paramThresh:
return thresdb;
break;
case paramMakeup:
return makeup;
break;
case paramSlew:
return slewfactor;
break;
case paramSidechain:
return sidechain;
break;
case paramGainRed:
return gainred;
break;
case paramOutputLevel:
return outlevel;
break;
default:
return 0.0f;
}
}
void ZamCompPlugin::setParameterValue(uint32_t index, float value)
{
switch (index)
{
case paramAttack:
attack = value;
break;
case paramRelease:
release = value;
break;
case paramKnee:
knee = value;
break;
case paramRatio:
ratio = value;
break;
case paramThresh:
thresdb = value;
break;
case paramMakeup:
makeup = value;
break;
case paramSlew:
slewfactor = value;
break;
case paramSidechain:
sidechain = value;
break;
case paramGainRed:
gainred = value;
break;
case paramOutputLevel:
outlevel = value;
break;
}
}
// -----------------------------------------------------------------------
// Process
void ZamCompPlugin::activate()
{
gainred = 0.0f;
outlevel = -45.0f;
oldL_yl = oldL_y1 = oldL_yg = 0.f;
}
void ZamCompPlugin::run(const float** inputs, float** outputs, uint32_t frames)
{
float srate = getSampleRate();
float width = (6.f * knee) + 0.01;
float slewwidth = 1.8f;
float cdb=0.f;
float attack_coeff = exp(-1000.f/(attack * srate));
float release_coeff = exp(-1000.f/(release * srate));
int attslew = 0;
float max = 0.f;
float lgaininp = 0.f;
float Lgain = 1.f;
float Lxg, Lxl, Lyg, Lyl;
float checkwidth = 0.f;
bool usesidechain = (sidechain < 0.5) ? false : true;
uint32_t i;
float ingain;
float in0;
float in1;
for (i = 0; i < frames; i++) {
in0 = inputs[0][i];
in1 = inputs[1][i];
ingain = usesidechain ? in1 : in0;
attslew = 0;
Lyg = 0.f;
Lxg = (ingain==0.f) ? -160.f : to_dB(fabs(ingain));
Lxg = sanitize_denormal(Lxg);
Lyg = Lxg + (1.f/ratio-1.f)*(Lxg-thresdb+width/2.f)*(Lxg-thresdb+width/2.f)/(2.f*width);
checkwidth = 2.f*fabs(Lxg-thresdb);
if (2.f*(Lxg-thresdb) < -width) {
Lyg = Lxg;
} else if (checkwidth <= width) {
Lyg = thresdb + (Lxg-thresdb)/ratio;
Lyg = sanitize_denormal(Lyg);
if (checkwidth <= slewwidth) {
if (Lyg >= oldL_yg) {
attslew = 1;
}
}
} else if (2.f*(Lxg-thresdb) > width) {
Lyg = thresdb + (Lxg-thresdb)/ratio;
Lyg = sanitize_denormal(Lyg);
}
attack_coeff = attslew ? exp(-1000.f/((attack + 2.0*(slewfactor - 1)) * srate)) : attack_coeff;
// Don't slew on release
Lxl = Lxg - Lyg;
oldL_yl = sanitize_denormal(oldL_yl);
if (Lxl < oldL_yl) {
Lyl = release_coeff * oldL_yl + (1.f-release_coeff)*Lxl;
} else if (Lxl > oldL_yl) {
Lyl = attack_coeff * oldL_yl+(1.f-attack_coeff)*Lxl;
} else {
Lyl = Lxl;
}
Lyl = sanitize_denormal(Lyl);
cdb = -Lyl;
Lgain = from_dB(cdb);
gainred = Lyl;
lgaininp = in0 * Lgain;
outputs[0][i] = lgaininp * from_dB(makeup);
max = (fabsf(outputs[0][i]) > max) ? fabsf(outputs[0][i]) : sanitize_denormal(max);
oldL_yl = Lyl;
oldL_yg = Lyg;
}
outlevel = (max == 0.f) ? -45.f : to_dB(max); // relative to - thresdb;
}
// -----------------------------------------------------------------------
Plugin* createPlugin()
{
return new ZamCompPlugin();
}
// -----------------------------------------------------------------------
END_NAMESPACE_DISTRHO
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