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-rw-r--r--src/mdaDelay.cpp285
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diff --git a/src/mdaDelay.cpp b/src/mdaDelay.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 "mdaDelay.h"
+
+#include <math.h>
+#include <float.h>
+
+AudioEffect *createEffectInstance(audioMasterCallback audioMaster)
+{
+ return new mdaDelay(audioMaster);
+}
+
+mdaDelay::mdaDelay(audioMasterCallback audioMaster) : AudioEffectX(audioMaster, 1, 6) // programs, parameters
+{
+ //inits here!
+ fParam0 = 0.50f; //left delay
+ fParam1 = 0.27f; //right ratio
+ fParam2 = 0.70f; //feedback
+ fParam3 = 0.50f; //tone
+ fParam4 = 0.33f; //wet mix
+ fParam5 = 0.50f; //output
+
+ size = 32766; //set max delay time at max sample rate
+ buffer = new float[size + 2]; //spare just in case!
+ ipos = 0;
+ fil0 = 0.0f;
+
+ setNumInputs(2);
+ setNumOutputs(2);
+ setUniqueID("mdaDelay"); //identify here
+ DECLARE_LVZ_DEPRECATED(canMono) ();
+ canProcessReplacing();
+ strcpy(programName, "Delay");
+
+ suspend(); //flush buffer
+ setParameter(0, 0.5);
+}
+
+bool mdaDelay::getProductString(char* text) { strcpy(text, "MDA Delay"); return true; }
+bool mdaDelay::getVendorString(char* text) { strcpy(text, "mda"); return true; }
+bool mdaDelay::getEffectName(char* name) { strcpy(name, "Delay"); return true; }
+
+void mdaDelay::setParameter(int32_t index, float value)
+{
+ float tmp;
+
+ switch(index)
+ {
+ case 0: fParam0 = value; break;
+ case 1: fParam1 = value; break;
+ case 2: fParam2 = value; break;
+ case 3: fParam3 = value; break;
+ case 4: fParam4 = value; break;
+ case 5: fParam5 = value; break;
+ }
+ //calcs here
+ ldel = (int32_t)(size * fParam0 * fParam0);
+ if(ldel<4) ldel=4;
+
+ switch(int(fParam1 * 17.9f)) //fixed left/right ratios
+ {
+ case 17: tmp = 0.5000f; break;
+ case 16: tmp = 0.6667f; break;
+ case 15: tmp = 0.7500f; break;
+ case 14: tmp = 0.8333f; break;
+ case 13: tmp = 1.0000f; break;
+ case 12: tmp = 1.2000f; break;
+ case 11: tmp = 1.3333f; break;
+ case 10: tmp = 1.5000f; break;
+ case 9: tmp = 2.0000f; break;
+ default: tmp = 4.0f * fParam1; break; //variable ratio
+ }
+ rdel = (int32_t)(size * fParam0 * fParam0 * tmp);
+ if(rdel>size) rdel=size;
+ if(rdel<4) rdel=4;
+
+ fil = fParam3;
+
+ if(fParam3>0.5f) //simultaneously change crossover frequency & high/low mix
+ {
+ fil = 0.5f * fil - 0.25f;
+ lmix = -2.0f * fil;
+ hmix = 1.0f;
+ }
+ else
+ {
+ hmix = 2.0f * fil;
+ lmix = 1.0f - hmix;
+ }
+ fil = (float)exp(-6.2831853f * pow(10.0f, 2.2f + 4.5f * fil) / getSampleRate());
+
+ fbk = 0.495f * fParam2;
+ wet = 1.0f - fParam4;
+ wet = fParam5 * (1.0f - wet * wet); //-3dB at 50% mix
+ dry = fParam5 * 2.0f * (1.0f - fParam4 * fParam4);
+
+ //if(fParam2>0.99) { fbk=0.5f; wet=0.0f; } //freeze
+}
+
+mdaDelay::~mdaDelay()
+{
+ if(buffer) delete [] buffer;
+}
+
+void mdaDelay::suspend()
+{
+ memset(buffer, 0, size * sizeof(float));
+}
+
+void mdaDelay::setProgramName(char *name)
+{
+ strcpy(programName, name);
+}
+
+void mdaDelay::getProgramName(char *name)
+{
+ strcpy(name, programName);
+}
+
+bool mdaDelay::getProgramNameIndexed (int32_t category, int32_t index, char* name)
+{
+ if (index == 0)
+ {
+ strcpy(name, programName);
+ return true;
+ }
+ return false;
+}
+
+float mdaDelay::getParameter(int32_t index)
+{
+ float v=0;
+
+ switch(index)
+ {
+ case 0: v = fParam0; break;
+ case 1: v = fParam1; break;
+ case 2: v = fParam2; break;
+ case 3: v = fParam3; break;
+ case 4: v = fParam4; break;
+ case 5: v = fParam5; break;
+ }
+ return v;
+}
+
+void mdaDelay::getParameterName(int32_t index, char *label)
+{
+ switch(index)
+ {
+ case 0: strcpy(label, "L Delay"); break;
+ case 1: strcpy(label, "R Delay"); break;
+ case 2: strcpy(label, "Feedback"); break;
+ case 3: strcpy(label, "Fb Tone"); break;
+ case 4: strcpy(label, "FX Mix"); break;
+ case 5: strcpy(label, "Output"); break;
+ }
+}
+
+#include <stdio.h>
+static void int2strng(int32_t value, char *string) { sprintf(string, "%d", value); }
+
+void mdaDelay::getParameterDisplay(int32_t index, char *text)
+{
+ switch(index)
+ {
+ case 0: int2strng((int32_t)(ldel * 1000.0f / getSampleRate()), text); break;
+ case 1: int2strng((int32_t)(100 * rdel / ldel), text); break;
+ case 2: int2strng((int32_t)(99 * fParam2), text); break;
+ case 3: int2strng((int32_t)(200 * fParam3 - 100), text); break;
+ case 4: int2strng((int32_t)(100 * fParam4), text); break;
+ case 5: int2strng((int32_t)(20 * log10(2.0 * fParam5)), text); break;
+ }
+}
+
+void mdaDelay::getParameterLabel(int32_t index, char *label)
+{
+ switch(index)
+ {
+ case 0: strcpy(label, "ms"); break;
+ case 3: strcpy(label, "Lo <> Hi"); break;
+ case 5: strcpy(label, "dB"); break;
+ default: strcpy(label, "%"); break;
+ }
+}
+
+//--------------------------------------------------------------------------------
+// process
+
+void mdaDelay::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 a, b, c, d, ol, or_, w=wet, y=dry, fb=fbk;
+ float lx=lmix, hx=hmix, f=fil, f0=fil0, tmp;
+ int32_t i=ipos, l, r, s=size;
+
+ l = (i + ldel) % (s + 1);
+ r = (i + rdel) % (s + 1);
+
+ --in1;
+ --in2;
+ --out1;
+ --out2;
+ while(--sampleFrames >= 0)
+ {
+ a = *++in1;
+ b = *++in2;
+ c = out1[1];
+ d = out2[1];
+
+ ol = *(buffer + l);
+ or_ = *(buffer + r);
+
+ tmp = w * (a + b) + fb * (ol + or_);
+ f0 = f * (f0 - tmp) + tmp;
+ *(buffer + i) = lx * f0 + hx * tmp;
+
+ i--; if(i<0) i=s;
+ l--; if(l<0) l=s;
+ r--; if(r<0) r=s;
+
+ *++out1 = c + y * a + ol;
+ *++out2 = d + y * b + or_;
+ }
+ ipos = i;
+ if(fabs(f0)<1.0e-10) fil0=0.0f; else fil0=f0;
+}
+
+void mdaDelay::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 a, b, ol, or_, w=wet, y=dry, fb=fbk;
+ float lx=lmix, hx=hmix, f=fil, f0=fil0, tmp;
+ int32_t i=ipos, l, r, s=size;
+
+ l = (i + ldel) % (s + 1);
+ r = (i + rdel) % (s + 1);
+
+ --in1;
+ --in2;
+ --out1;
+ --out2;
+ while(--sampleFrames >= 0)
+ {
+ a = *++in1;
+ b = *++in2;
+
+ ol = *(buffer + l); //delay outputs
+ or_ = *(buffer + r);
+
+ tmp = w * (a + b) + fb * (ol + or_); //mix input & feedback
+ f0 = f * (f0 - tmp) + tmp; //low-pass filter
+ *(buffer + i) = lx * f0 + hx * tmp; //delay input
+
+ i--; if(i<0) i=s;
+ l--; if(l<0) l=s;
+ r--; if(r<0) r=s;
+
+ *++out1 = y * a + ol; //mix wet & dry
+ *++out2 = y * b + or_;
+ }
+ ipos = i;
+ if(fabs(f0)<1.0e-10) fil0=0.0f; else fil0=f0; //trap denormals
+}
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