/* Copyright 2008-2011 David Robillard 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 . */ #include "mdaLimiter.h" #include 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 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; }