allpass.h

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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