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/*
Freeverb
Written by Jezar at Dreampoint, June 2000
http://www.dreampoint.co.uk
This code is public domain
Translated to C by Peter Hanappe, Mai 2001
Further modified by Werner Schweer, 2009
*/
#include "rev.h"
namespace FluidS {
#define DC_OFFSET 1e-8
static ReverbPreset revmodel_preset[] = {
// name roomsize damp width level
{ "Default", 0.5f, 0.5f, 1.0f, 0.2f },
{ "Test 2", 0.4f, 0.2f, 0.5f, 0.8f },
{ "Test 3", 0.6f, 0.4f, 0.5f, 0.7f },
{ "Test 4", 0.8f, 0.7f, 0.5f, 0.6f },
{ "Test 5", 0.8f, 1.0f, 0.5f, 0.5f },
{ 0, 0.0f, 0.0f, 0.0f, 0.0f }
};
//---------------------------------------------------------
// setbuffer
//---------------------------------------------------------
void Allpass::setbuffer(int size)
{
buffer = new float[size];
bufsize = size;
bufidx = 0;
}
//---------------------------------------------------------
// init
//---------------------------------------------------------
void Allpass::init()
{
for (int i = 0; i < bufsize; i++)
buffer[i] = DC_OFFSET; // this is not 100 % correct.
}
void Comb::setbuffer(int size)
{
filterstore = 0;
bufidx = 0;
buffer = new float[size];
bufsize = size;
}
void Comb::init()
{
for (int i = 0; i < bufsize; i++)
buffer[i] = DC_OFFSET; // This is not 100 % correct.
}
void Comb::setdamp(float val)
{
damp1 = val;
damp2 = 1 - val;
}
static const int stereospread = 23;
/*
These values assume 44.1KHz sample rate
they will probably be OK for 48KHz sample rate
but would need scaling for 96KHz (or other) sample rates.
The values were obtained by listening tests.
*/
static const int combtuning[] = {
1116, 1188, 1277, 1356, 1422, 1491, 1557, 1617
};
static const int allpasstuning[] = {
556, 441, 341, 225
};
//---------------------------------------------------------
// Reverb
//---------------------------------------------------------
Reverb::Reverb()
{
for (int i = 0; i < numcombs; ++i) {
combL[i].setbuffer(combtuning[i]);
combR[i].setbuffer(combtuning[i] + stereospread);
}
for (int i = 0; i < numallpasses; ++i) {
allpassL[i].setbuffer(allpasstuning[i]);
allpassR[i].setbuffer(allpasstuning[i] + stereospread);
allpassL[i].setfeedback(0.5f);
allpassR[i].setfeedback(0.5f);
}
gain = 0.30; // input gain
setPreset(0);
init(); // Clear all buffers
parameterChanged = false;
}
//---------------------------------------------------------
// init
//---------------------------------------------------------
void Reverb::init()
{
for (int i = 0; i < numcombs; i++) {
combL[i].init();
combR[i].init();
}
for (int i = 0; i < numallpasses; i++) {
allpassL[i].init();
allpassR[i].init();
}
}
//---------------------------------------------------------
// process
//---------------------------------------------------------
void Reverb::process(int n, float* in, float* l, float* r)
{
if (parameterChanged) {
roomsize = newRoomsize;
damp = newDamp;
width = newWidth;
gain = newGain;
update();
parameterChanged = false;
}
for (int k = 0; k < n; k++) {
float outL = 0.0;
float outR = 0.0;
float input = (in[k] * 2.0 + DC_OFFSET) * gain;
for (int i = 0; i < numcombs; i++) { // Accumulate comb filters in parallel
outL += combL[i].process(input);
outR += combR[i].process(input);
}
for (int i = 0; i < numallpasses; i++) { // Feed through allpasses in series
outL = allpassL[i].process(outL);
outR = allpassR[i].process(outR);
}
/* Remove the DC offset */
outL -= DC_OFFSET;
outR -= DC_OFFSET;
/* Calculate output MIXING with anything already there */
l[k] += outL * wet1 + outR * wet2;
r[k] += outR * wet1 + outL * wet2;
}
}
//---------------------------------------------------------
// update
// Recalculate internal values after parameter change
//---------------------------------------------------------
void Reverb::update()
{
wet1 = wet * (width * .5 + 0.5f);
wet2 = wet * ((1.0 - width) * .5);
for (int i = 0; i < numcombs; i++) {
combL[i].setfeedback(roomsize);
combR[i].setfeedback(roomsize);
}
for (int i = 0; i < numcombs; i++) {
combL[i].setdamp(damp);
combR[i].setdamp(damp);
}
}
//---------------------------------------------------------
// setPreset
//---------------------------------------------------------
bool Reverb::setPreset(int nr)
{
if ((unsigned)nr >= sizeof(revmodel_preset)/sizeof(*revmodel_preset))
return false;
setroomsize(revmodel_preset[nr].roomsize);
setdamp(revmodel_preset[nr].damp);
setwidth(revmodel_preset[nr].width);
setlevel(revmodel_preset[nr].level);
newRoomsize = roomsize;
newDamp = damp;
newWidth = width;
update();
return true;
}
void Reverb::setParameter(int idx, double value)
{
switch (idx) {
case 0: newRoomsize = value; break;
case 1: newDamp = value; break;
case 2: newWidth = value; break;
case 3: newGain = value; break;
}
parameterChanged = true;
}
//---------------------------------------------------------
// parameter
//---------------------------------------------------------
double Reverb::parameter(int idx) const
{
switch (idx) {
case 0: return roomsize;
case 1: return damp;
case 2: return width;
case 3: return gain;
}
return 0.0;
}
}
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