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-rw-r--r--src/mdaLimiter.cpp293
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diff --git a/src/mdaLimiter.cpp b/src/mdaLimiter.cpp
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+/*
+ Copyright 2008-2011 David Robillard <http://drobilla.net>
+ Copyright 1999-2000 Paul Kellett (Maxim Digital Audio)
+
+ This 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 software 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 software. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "mdaLimiter.h"
+
+#include <math.h>
+
+AudioEffect *createEffectInstance(audioMasterCallback audioMaster)
+{
+ return new mdaLimiter(audioMaster);
+}
+
+mdaLimiter::mdaLimiter(audioMasterCallback audioMaster) : AudioEffectX(audioMaster, 1, 5) // 1 program, 4 parameters
+{
+ fParam1 = (float)0.60; //thresh
+ fParam2 = (float)0.60; //trim
+ fParam3 = (float)0.15; //attack
+ fParam4 = (float)0.50; //release
+ fParam5 = (float)0.0; //knee
+
+ setNumInputs(2); // stereo in
+ setNumOutputs(2); // stereo out
+ setUniqueID("mdaLimiter"); // identify
+ DECLARE_LVZ_DEPRECATED(canMono) ();
+ canProcessReplacing(); // supports both accumulating and replacing output
+ strcpy(programName, "Limiter"); // default program name
+
+ if(fParam5>0.0) //soft knee
+ {
+ thresh = (float)pow(10.0, 1.0 - (2.0 * fParam1));
+ }
+ else //hard knee
+ {
+ thresh = (float)pow(10.0, (2.0 * fParam1) - 2.0);
+ }
+ trim = (float)(pow(10.0, (2.0 * fParam2) - 1.0));
+ att = (float)pow(10.0, -0.01 - 2.0 * fParam3);//wavelab overruns with zero???
+ rel = (float)pow(10.0, -2.0 - (3.0 * fParam4));
+ gain = 1.0;
+}
+
+mdaLimiter::~mdaLimiter()
+{
+ // nothing to do here
+}
+
+bool mdaLimiter::getProductString(char* text) { strcpy(text, "MDA Limiter"); return true; }
+bool mdaLimiter::getVendorString(char* text) { strcpy(text, "mda"); return true; }
+bool mdaLimiter::getEffectName(char* name) { strcpy(name, "Limiter"); return true; }
+
+void mdaLimiter::setProgramName(char *name)
+{
+ strcpy(programName, name);
+}
+
+void mdaLimiter::getProgramName(char *name)
+{
+ strcpy(name, programName);
+}
+
+bool mdaLimiter::getProgramNameIndexed (int32_t category, int32_t index, char* name)
+{
+ if (index == 0)
+ {
+ strcpy(name, programName);
+ return true;
+ }
+ return false;
+}
+
+void mdaLimiter::setParameter(int32_t index, float value)
+{
+ switch(index)
+ {
+ case 0: fParam1 = value; break;
+ case 1: fParam2 = value; break;
+ case 2: fParam4 = value; break;
+ case 3: fParam3 = value; break;
+ case 4: fParam5 = value; break;
+ }
+ //calcs here
+ if(fParam5>0.0) //soft knee
+ {
+ thresh = (float)pow(10.0, 1.0 - (2.0 * fParam1));
+ }
+ else //hard knee
+ {
+ thresh = (float)pow(10.0, (2.0 * fParam1) - 2.0);
+ }
+ trim = (float)(pow(10.0, (2.0 * fParam2) - 1.0));
+ att = (float)pow(10.0, -2.0 * fParam3);
+ rel = (float)pow(10.0, -2.0 - (3.0 * fParam4));
+}
+
+float mdaLimiter::getParameter(int32_t index)
+{
+ float v=0;
+
+ switch(index)
+ {
+ case 0: v = fParam1; break;
+ case 1: v = fParam2; break;
+ case 2: v = fParam4; break;
+ case 3: v = fParam3; break;
+ case 4: v = fParam5; break;
+ }
+ return v;
+}
+
+void mdaLimiter::getParameterName(int32_t index, char *label)
+{
+ switch(index)
+ {
+ case 0: strcpy(label, "Thresh"); break;
+ case 1: strcpy(label, "Output"); break;
+ case 3: strcpy(label, "Attack"); break;
+ case 2: strcpy(label, "Release"); break;
+ case 4: strcpy(label, "Knee"); break;
+ }
+}
+
+#include <stdio.h>
+static void int2strng(int32_t value, char *string) { sprintf(string, "%d", value); }
+
+void mdaLimiter::getParameterDisplay(int32_t index, char *text)
+{
+ switch(index)
+ {
+ case 0: int2strng((int32_t)(40.0*fParam1 - 40.0),text); break;
+ case 1: int2strng((int32_t)(40.0*fParam2 - 20.0),text); break;
+ case 3: int2strng((int32_t)(-301030.1 / (getSampleRate() * log10(1.0 - att))),text); break;
+ case 2: int2strng((int32_t)(-301.0301 / (getSampleRate() * log10(1.0 - rel))),text); break;
+ case 4: if(fParam5>0.0) strcpy(text, "SOFT");
+ else strcpy(text, "HARD");
+ break;
+ }
+
+}
+
+void mdaLimiter::getParameterLabel(int32_t index, char *label)
+{
+ switch(index)
+ {
+ case 0: strcpy(label, "dB"); break;
+ case 1: strcpy(label, "dB"); break;
+ case 3: strcpy(label, "ms"); break;
+ case 2: strcpy(label, "ms"); break;
+ case 4: strcpy(label, ""); break;
+ }
+}
+
+//--------------------------------------------------------------------------------
+// process
+
+void mdaLimiter::process(float **inputs, float **outputs, int32_t sampleFrames)
+{
+ float *in1 = inputs[0];
+ float *in2 = inputs[1];
+ float *out1 = outputs[0];
+ float *out2 = outputs[1];
+ float g, c, d, at, re, tr, th, lev, ol, or_;
+
+ th = thresh;
+ g = gain;
+ at = att;
+ re = rel;
+ tr = trim;
+
+ --in1;
+ --in2;
+ --out1;
+ --out2;
+
+ if(fParam5>0.5) //soft knee
+ {
+ while(--sampleFrames >= 0)
+ {
+ ol = *++in1;
+ or_ = *++in2;
+ c = out1[1];
+ d = out2[1];
+
+ lev = (float)(1.0 / (1.0 + th * fabs(ol + or_)));
+ if(g>lev) { g=g-at*(g-lev); } else { g=g+re*(lev-g); }
+
+ c += (ol * tr * g);
+ d += (or_ * tr * g);
+
+ *++out1 = c;
+ *++out2 = d;
+ }
+ }
+ else
+ {
+ while(--sampleFrames >= 0)
+ {
+ ol = *++in1;
+ or_ = *++in2;
+ c = out1[1];
+ d = out2[1];
+
+ lev = (float)(0.5 * g * fabs(ol + or_));
+
+ if (lev > th)
+ {
+ g = g - (at * (lev - th));
+ }
+ else
+ {
+ g = g + (float)(re * (1.0 - g));
+ }
+
+ c += (ol * tr * g);
+ d += (or_ * tr * g);
+
+ *++out1 = c;
+ *++out2 = d;
+ }
+ }
+ gain = g;
+}
+
+void mdaLimiter::processReplacing(float **inputs, float **outputs, int32_t sampleFrames)
+{
+ float *in1 = inputs[0];
+ float *in2 = inputs[1];
+ float *out1 = outputs[0];
+ float *out2 = outputs[1];
+ float g, at, re, tr, th, lev, ol, or_;
+
+ th = thresh;
+ g = gain;
+ at = att;
+ re = rel;
+ tr = trim;
+
+ --in1;
+ --in2;
+ --out1;
+ --out2;
+ if(fParam5>0.5) //soft knee
+ {
+ while(--sampleFrames >= 0)
+ {
+ ol = *++in1;
+ or_ = *++in2;
+
+ lev = (float)(1.0 / (1.0 + th * fabs(ol + or_)));
+ if(g>lev) { g=g-at*(g-lev); } else { g=g+re*(lev-g); }
+
+ *++out1 = (ol * tr * g);
+ *++out2 = (or_ * tr * g);
+ }
+ }
+ else
+ {
+ while(--sampleFrames >= 0)
+ {
+ ol = *++in1;
+ or_ = *++in2;
+
+ lev = (float)(0.5 * g * fabs(ol + or_));
+
+ if (lev > th)
+ {
+ g = g - (at * (lev - th));
+ }
+ else //below threshold
+ {
+ g = g + (float)(re * (1.0 - g));
+ }
+
+ *++out1 = (ol * tr * g);
+ *++out2 = (or_ * tr * g);
+ }
+ }
+ gain = g;
+}
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