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/*
FFTease - A set of Live Spectral Processors
Originally written by Eric Lyon and Christopher Penrose for the Max/MSP platform
Copyright (c)Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "main.h"
#include <stdlib.h>
class thresher:
public fftease
{
FLEXT_HEADER_S(thresher,fftease,setup)
public:
thresher();
protected:
virtual V Set();
virtual V Clear();
virtual V Delete();
virtual V Transform(I n,S *const *in);
F *_compositeFrame;
I *_framesLeft;
BL _firstFrame;
F _moveThreshold;
I _maxHoldFrames;
private:
static V setup(t_classid c);
};
FLEXT_LIB_DSP("fftease, thresher~ nacho~",thresher)
V thresher::setup(t_classid )
{
}
void thresher::Set()
{
fftease::Set();
const F rate = Samplerate();
const I n = Blocksize(),_N = get_N(),_N2 = _N/2;
_compositeFrame = new F[_N+2];
_framesLeft = new I[_N2+1];
_firstFrame = true;
_moveThreshold = .00001 ;
F _maxHoldTime = 5.0 ;
_maxHoldFrames = (I)(_maxHoldTime *rate/n);
}
void thresher::Clear()
{
fftease::Clear();
_compositeFrame = NULL;
_framesLeft = NULL;
}
void thresher::Delete()
{
fftease::Delete();
if(_compositeFrame) delete[] _compositeFrame;
if(_framesLeft) delete[] _framesLeft;
}
thresher::thresher():
fftease(4,F_BALANCED|F_BITSHUFFLE|F_PHCONV)
{
AddInSignal("Messages and input signal");
AddOutSignal("Transformed signal");
}
V thresher::Transform(I _N,S *const *)
{
I *fr = _framesLeft;
if( _firstFrame ) {
for (I i = 0; i <= _N; i += 2,++fr ){
_compositeFrame[i] = _channel1[i];
_compositeFrame[i+1] = _channel1[i+1];
*fr = _maxHoldFrames;
}
_firstFrame = false;
}
else {
for(I i = 0; i <= _N; i += 2,++fr ){
if( (fabs( _compositeFrame[i] - _channel1[i] ) > _moveThreshold) || (*fr <= 0) ) {
_compositeFrame[i] = _channel1[i];
_compositeFrame[i+1] = _channel1[i+1];
*fr = _maxHoldFrames;
}
else {
_channel1[i] = _compositeFrame[i];
_channel1[i+1] = _compositeFrame[i+1];
--*fr;
}
}
}
}
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