Freeverb3 - Library Usage Examples

The classes which have process() member function can get one sample and output one sample. You have to call process() multiple times to process samples.

// g++ -I /usr/include/libfreeverb3-2 -lfreeverb3
#include <freeverb/efilter.hpp>
#include <freeverb/biquad.hpp>
...

float input[size], output1[size], output2[size];
...
fv3::iir_1st_f IIR1_LPF;
fv3::biquad_f  IIR2_LPF;
IIR1_LPF.setLPFA(fc, sampleRate);

IIR2_LPF.setLPF(fc, transition_bandWidth, sampleRate);
for(int i = 0;i < size;i ++)
{output1[i] = IIR1_LPF.process(input[i]);
 output2[i] = IIR2_LPF.process(input[i]);}

Using FIR filter

The classes which have processreplace() member function can process multiple arrays of samples. You do not need to call processreplace() multiple times.

// g++ -I /usr/include/libfreeverb3-2 -lfreeverb3
#include <freeverb/irmodel3.hpp>
#include <freeverb/firfilter.hpp>
...
float inputL[size], inputR[size], outputL[size], outputR[size];

...
fv3::irmodel3_f FIR_LPF;
long lengthOfFilter; // must be an odd number.
// see fir3bandsplit.cpp predictN to calculate the length from transitionBandWidth
float filter[lengthOfFilter];
fv3::firfilter_f::lpf(filter,lengthOfFilter,FV3_W_HANNING,(fc/sampleRate),0);
FIR_LPF.setwetr(1);
FIR_LPF.setdryr(0);
FIR_LPF.loadImpulse(filter,filter,lengthOfFilter);
FIR_LPF.processreplace(inputL,inputR,outputL,outputR,size,FV3_IR_MUTE_DRY|FV3_IR_SKIP_FILTER);

Library Usage Examples

Using IIR filter

Using FIR filter