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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, 1, 0) // 1 program, 0 states
{
// set default values
d_setProgram(0);
}
// -----------------------------------------------------------------------
// Init
void ZamCompPlugin::d_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 = 200.0f;
break;
case paramRelease:
parameter.hints = kParameterIsAutomable;
parameter.name = "Release";
parameter.symbol = "rel";
parameter.unit = "ms";
parameter.ranges.def = 80.0f;
parameter.ranges.min = 50.0f;
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;
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 = -60.0f;
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 = -30.0f;
parameter.ranges.max = 30.0f;
break;
case paramGainR:
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 = 40.0f;
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::d_initProgramName(uint32_t index, d_string& programName)
{
if (index != 0)
return;
programName = "Default";
}
// -----------------------------------------------------------------------
// Internal data
float ZamCompPlugin::d_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 paramGainR:
return gainr;
break;
case paramOutputLevel:
return outlevel;
break;
default:
return 0.0f;
}
}
void ZamCompPlugin::d_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 paramGainR:
gainr = value;
break;
case paramOutputLevel:
outlevel = value;
break;
}
}
void ZamCompPlugin::d_setProgram(uint32_t index)
{
if (index != 0)
return;
/* Default parameter values */
attack = 10.0f;
release = 80.0f;
knee = 0.0f;
ratio = 4.0f;
thresdb = 0.0f;
makeup = 0.0f;
/* reset filter values */
d_activate();
}
// -----------------------------------------------------------------------
// Process
void ZamCompPlugin::d_activate()
{
gainr = 0.0f;
outlevel = -45.f;
old_yl = old_y1 = old_yg = 0.0f;
}
void ZamCompPlugin::d_run(const float** inputs, float** outputs, uint32_t frames)
{
float srate = d_getSampleRate();
float width=(knee-0.99f)*6.f;
float cdb=0.f;
float attack_coeff = exp(-1000.f/(attack * srate));
float release_coeff = exp(-1000.f/(release * srate));
int slew;
float slewfactor = 1.f + knee/2.f;
float gain = 1.f;
float xg, xl, yg, yl, y1;
uint32_t i;
float max = 0.f;
for (i = 0; i < frames; i++) {
yg=0.f;
slew = 0;
xg = (inputs[0][i]==0.f) ? -160.f : to_dB(fabs(inputs[0][i]));
xg = sanitize_denormal(xg);
yg = xg + (1.f/ratio-1.f)*(xg-thresdb+width/2.f)*(xg-thresdb+width/2.f)/(2.f*width);
yg = sanitize_denormal(yg);
if (2.f*(xg-thresdb)<-width) {
// before the knee
yg = xg;
} else if (2.f*fabs(xg-thresdb)<=width && yg >= old_yg) {
// inside the knee from below
// NOOP
slew = 1;
} else if (2.f*fabs(xg-thresdb)<=width && yg < old_yg) {
// inside the knee dropping off
yg = thresdb + (xg-thresdb)/ratio;
yg = sanitize_denormal(yg);
} else if (2.f*(xg-thresdb)>width) {
// after the knee
yg = thresdb + (xg-thresdb)/ratio;
yg = sanitize_denormal(yg);
}
xl = xg - yg;
old_y1 = sanitize_denormal(old_y1);
old_yl = sanitize_denormal(old_yl);
y1 = fmaxf(xl, release_coeff * old_y1+(1.f-release_coeff)*xl);
attack_coeff = slew ? exp(-1000.f/(attack*slewfactor * srate)) : attack_coeff;
yl = attack_coeff * old_yl+(1.f-attack_coeff)*y1;
y1 = sanitize_denormal(y1);
yl = sanitize_denormal(yl);
cdb = -yl;
gain = from_dB(cdb);
gainr = yl;
outputs[0][i] = inputs[0][i];
outputs[0][i] *= gain * from_dB(makeup);
max = (fabsf(outputs[0][i]) > max) ? fabsf(outputs[0][i]) : sanitize_denormal(max);
old_yl = yl;
old_y1 = y1;
old_yg = yg;
}
outlevel = (max == 0.f) ? -45.f : to_dB(max);
}
// -----------------------------------------------------------------------
Plugin* createPlugin()
{
return new ZamCompPlugin();
}
// -----------------------------------------------------------------------
END_NAMESPACE_DISTRHO
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