allpass.hpp

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 // Allpass filter declaration
//
// Written by Jezar at Dreampoint, June 2000
// http://www.dreampoint.co.uk
// This code is public domain
 
#ifndef _allpass_
#define _allpass_
#include "denormals.h"
 
class allpass
{
public:
                    allpass();
            void    setbuffer(float *buf, int size);
    inline  float   process(float inp);
            void    mute();
            void    setfeedback(float val);
            float   getfeedback();
// private:
    float   feedback;
    float   *buffer;
    int     bufsize;
    int     bufidx;
};
 
 
// Big to inline - but crucial for speed
 
inline float allpass::process(float input)
{
    float output;
    float bufout;
    
    bufout = buffer[bufidx];
    undenormalise(bufout);
    
    output = -input + bufout;
    buffer[bufidx] = input + (bufout*feedback);
 
    if(++bufidx>=bufsize) bufidx = 0;
 
    return output;
}
 
#endif//_allpass
 
//ends