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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
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