From 478eeca99ee6f5bad3063700fbcc9d8913c770ae Mon Sep 17 00:00:00 2001
From: Thomas Grill <xovo@users.sourceforge.net>
Date: Fri, 17 Jan 2003 04:37:14 +0000
Subject:  ""

svn path=/trunk/; revision=342
---
 externals/grill/fftease/src/taint~.cpp | 97 ++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 externals/grill/fftease/src/taint~.cpp

(limited to 'externals/grill/fftease/src/taint~.cpp')

diff --git a/externals/grill/fftease/src/taint~.cpp b/externals/grill/fftease/src/taint~.cpp
new file mode 100644
index 00000000..675ced1a
--- /dev/null
+++ b/externals/grill/fftease/src/taint~.cpp
@@ -0,0 +1,97 @@
+/*
+
+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 taint:
+	public fftease
+{
+	FLEXT_HEADER_S(taint,fftease,setup)
+	
+public:
+	taint(I argc,const t_atom *argv);
+
+protected:
+
+	virtual V Transform(I n,S *const *in);
+
+	V ms_thresh(F thr) { _threshold = (F)pow(10.,(_threshdB = thr)*.05); }
+
+	F _threshold,_threshdB;
+	BL _invert;
+
+private:
+	static V setup(t_classid c);
+
+	FLEXT_ATTRGET_F(_threshdB)
+	FLEXT_CALLSET_F(ms_thresh)
+	FLEXT_ATTRVAR_B(_invert)
+};
+
+FLEXT_LIB_DSP_V("fftease, taint~",taint)
+
+
+V taint::setup(t_classid c)
+{
+	FLEXT_CADDATTR_VAR(c,"threshold",_threshdB,ms_thresh);
+	FLEXT_CADDATTR_VAR1(c,"invert",_invert);
+}
+
+
+taint::taint(I argc,const t_atom *argv):
+	fftease(4,F_STEREO|F_WINDOW|F_BITSHUFFLE|F_CONVERT),
+	_threshdB(-10),_invert(false)
+{
+	/* parse and set object's options given */
+	if(argc >= 1) {
+		if(CanbeFloat(argv[0]))
+			_threshdB = GetAFloat(argv[0]);
+		else
+			post("%s - Threshold must be a float value - set to %f",thisName(),_threshdB);
+	}
+
+	if(argc >= 2) {
+		if(CanbeBool(argv[1]))
+			_invert = GetABool(argv[1]);
+		else
+			post("%s - Invert must be a boolean value - set to %0i",thisName(),_invert?1:0);
+	}
+
+	ms_thresh(_threshdB);
+
+	AddInSignal("Messages and frequency reference signal");
+	AddInSignal("Amplitude reference signal");
+	AddOutSignal("Transformed signal");
+}
+
+
+V taint::Transform(I _N2,S *const *in)
+{
+	for (I i = 0; i <= _N2; i++ ) {
+		const I even = i*2, odd = even + 1;
+
+		const F magnitude = _channel2[even];
+
+		if(_invert) {
+			// use threshold for inverse filtering to avoid division by zero 
+			if ( magnitude < _threshold )
+				_channel1[even] = 0;
+			else
+				_channel1[even] /= magnitude;
+		}
+		else {
+			// simple multiplication of magnitudes 
+			if (magnitude > _threshold)
+				_channel1[even] *= magnitude;
+		}
+	}
+}
-- 
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