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/**
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* |
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* Copyright (c) 2013-2014 Pascal Gauthier. |
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* Copyright (c) 2013-2014 Filatov Vadim. |
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*
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* Filter taken from the Obxd project : |
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* https://github.com/2DaT/Obxd
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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*/ |
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#define _USE_MATH_DEFINES |
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#include <math.h> |
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#include "PluginFx.h" |
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const float dc = 1e-18; |
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inline static float tptpc(float& state,float inp,float cutoff) { |
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double v = (inp - state) * cutoff / (1 + cutoff); |
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double res = v + state; |
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state = res + v; |
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return res; |
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} |
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inline static float tptlpupw(float & state , float inp , float cutoff , float srInv) { |
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cutoff = (cutoff * srInv)*M_PI; |
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double v = (inp - state) * cutoff / (1 + cutoff); |
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double res = v + state; |
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state = res + v; |
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return res; |
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} |
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//static float linsc(float param,const float min,const float max) {
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// return (param) * (max - min) + min;
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//}
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static float logsc(float param, const float min,const float max,const float rolloff = 19.0f) { |
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return ((expf(param * logf(rolloff+1)) - 1.0f) / (rolloff)) * (max-min) + min; |
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} |
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PluginFx::PluginFx() { |
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uiCutoff = 1; |
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uiReso = 0; |
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uiGain = 1; |
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} |
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void PluginFx::init(int sr) { |
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mm=0; |
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s1=s2=s3=s4=c=d=0; |
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R24=0; |
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mmch = (int)(mm * 3); |
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mmt = mm*3-mmch; |
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sampleRate = sr; |
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sampleRateInv = 1/sampleRate; |
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float rcrate =sqrt((44000/sampleRate)); |
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rcor24 = (970.0 / 44000)*rcrate; |
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rcor24Inv = 1 / rcor24; |
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bright = tan((sampleRate*0.5f-10) * M_PI * sampleRateInv); |
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R = 1; |
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rcor = (480.0 / 44000)*rcrate; |
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rcorInv = 1 / rcor; |
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bandPassSw = false; |
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pCutoff = -1; |
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pReso = -1; |
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dc_r = 1.0-(126.0/sr); |
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dc_id = 0; |
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dc_od = 0; |
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} |
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inline float PluginFx::NR24(float sample,float g,float lpc) { |
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float ml = 1 / (1+g); |
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float S = (lpc*(lpc*(lpc*s1 + s2) + s3) +s4)*ml; |
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float G = lpc*lpc*lpc*lpc; |
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float y = (sample - R24 * S) / (1 + R24*G); |
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return y + 1e-8; |
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}; |
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inline float PluginFx::NR(float sample, float g) { |
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float y = ((sample- R * s1*2 - g*s1 - s2)/(1+ g*(2*R + g))) + dc; |
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return y; |
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} |
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void PluginFx::process(float *work, int sampleSize) { |
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// very basic DC filter
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float t_fd = work[0]; |
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work[0] = work[0] - dc_id + dc_r * dc_od; |
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dc_id = t_fd; |
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for (int i=1; i<sampleSize; i++) { |
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t_fd = work[i]; |
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work[i] = work[i] - dc_id + dc_r * work[i-1]; |
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dc_id = t_fd; |
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} |
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dc_od = work[sampleSize-1]; |
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if ( uiGain != 1 ) { |
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for(int i=0; i < sampleSize; i++ ) |
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work[i] *= uiGain; |
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} |
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// don't apply the LPF if the cutoff is to maximum
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if ( uiCutoff == 1 ) |
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return; |
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if ( uiCutoff != pCutoff || uiReso != pReso ) { |
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rReso = (0.991-logsc(1-uiReso,0,0.991)); |
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R24 = 3.5 * rReso; |
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float cutoffNorm = logsc(uiCutoff,60,19000); |
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rCutoff = (float)tan(cutoffNorm * sampleRateInv * M_PI); |
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pCutoff = uiCutoff; |
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pReso = uiReso; |
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R = 1 - rReso; |
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} |
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// THIS IS MY FAVORITE 4POLE OBXd filter
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// maybe smooth this value
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float g = rCutoff; |
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float lpc = g / (1 + g); |
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for(int i=0; i < sampleSize; i++ ) { |
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float s = work[i]; |
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s = s - 0.45*tptlpupw(c,s,15,sampleRateInv); |
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s = tptpc(d,s,bright); |
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float y0 = NR24(s,g,lpc); |
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//first low pass in cascade
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double v = (y0 - s1) * lpc; |
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double res = v + s1; |
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s1 = res + v; |
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//damping
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s1 =atan(s1*rcor24)*rcor24Inv; |
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float y1= res; |
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float y2 = tptpc(s2,y1,g); |
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float y3 = tptpc(s3,y2,g); |
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float y4 = tptpc(s4,y3,g); |
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float mc=0.0; |
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switch(mmch) { |
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case 0: |
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mc = ((1 - mmt) * y4 + (mmt) * y3); |
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break; |
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case 1: |
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mc = ((1 - mmt) * y3 + (mmt) * y2); |
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break; |
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case 2: |
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mc = ((1 - mmt) * y2 + (mmt) * y1); |
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break; |
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case 3: |
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mc = y1; |
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break; |
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} |
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//half volume comp
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work[i] = mc * (1 + R24 * 0.45); |
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} |
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} |
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/*
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// THIS IS THE 2POLE FILTER
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for(int i=0; i < sampleSize; i++ ) { |
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float s = work[i]; |
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s = s - 0.45*tptlpupw(c,s,15,sampleRateInv); |
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s = tptpc(d,s,bright); |
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//float v = ((sample- R * s1*2 - g2*s1 - s2)/(1+ R*g1*2 + g1*g2));
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float v = NR(s,g); |
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float y1 = v*g + s1; |
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//damping
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s1 = atan(s1 * rcor) * rcorInv; |
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float y2 = y1*g + s2; |
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s2 = y2 + y1*g; |
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double mc; |
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if(!bandPassSw) |
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mc = (1-mm)*y2 + (mm)*v; |
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else |
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{ |
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mc =2 * ( mm < 0.5 ? |
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((0.5 - mm) * y2 + (mm) * y1): |
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((1-mm) * y1 + (mm-0.5) * v) |
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); |
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} |
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work[i] = mc; |
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} |
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*/ |
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@ -0,0 +1,72 @@ |
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/**
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Copyright (c) 2013 Pascal Gauthier. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software Foundation, |
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef PLUGINFX_H_INCLUDED |
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#define PLUGINFX_H_INCLUDED |
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class PluginFx { |
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float s1, s2, s3, s4; |
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float sampleRate; |
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float sampleRateInv; |
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float d, c; |
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float R24; |
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float rcor24, rcor24Inv; |
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float bright; |
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// 24 db multimode
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float mm; |
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float mmt; |
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int mmch; |
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inline float NR24(float sample, float g, float lpc); |
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// preprocess values taken the UI
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float rCutoff; |
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float rReso; |
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float rGain; |
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// thread values; if these are different from the UI,
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// it needs to be recalculated.
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float pReso; |
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float pCutoff; |
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float pGain; |
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// I am still keeping the 2pole w/multimode filter
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inline float NR(float sample, float g); |
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bool bandPassSw; |
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float rcor, rcorInv; |
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int R; |
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float dc_id; |
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float dc_od; |
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float dc_r; |
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public: |
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PluginFx(); |
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// this is set directly by the ui / parameter
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float uiCutoff; |
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float uiReso; |
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float uiGain; |
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void init(int sampleRate); |
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void process(float *work, int sampleSize); |
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}; |
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#endif // PLUGINFX_H_INCLUDED
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