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path: root/src/iemlib1/sigiem_cot4.c
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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.

iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2003 */

#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif


#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
#include <stdio.h>
#include <string.h>

/* ------------------------ iem_cot4~ ----------------------------- */

float *iem_cot4_table_cos=(float *)0L;
float *iem_cot4_table_sin=(float *)0L;

static t_class *sigiem_cot4_class;

typedef struct _sigiem_cot4
{
	t_object x_obj;
	float x_sr;
	float x_msi;
} t_sigiem_cot4;

static t_int *sigiem_cot4_perform(t_int *w)
{
	t_float *in = (t_float *)(w[1]);
	t_float *out = (t_float *)(w[2]);
	t_float norm_freq;
	t_float hout;
	t_sigiem_cot4 *x = (t_sigiem_cot4 *)(w[3]);
	t_float sr=x->x_sr;
	int n = (int)(w[4]);
	float *ctab = iem_cot4_table_cos, *stab = iem_cot4_table_sin;
	float *caddr, *saddr, cf1, cf2, sf1, sf2, frac;
	double dphase;
	int normhipart;
	int32 mytfi;
	union tabfudge tf;
	
	tf.tf_d = UNITBIT32;
	normhipart = tf.tf_i[HIOFFSET];

#if 0			/* this is the readable version of the code. */
	while (n--)
	{
		norm_freq = *in * sr;
		if(norm_freq < 0.0001f)
			norm_freq = 0.0001f;
		else if(norm_freq > 0.9f)
			norm_freq = 0.9f;
		dphase = (double)(norm_freq * (float)(COSTABSIZE)) + UNITBIT32;
		tf.tf_d = dphase;
		mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
		saddr = stab + (mytfi);
		caddr = ctab + (mytfi);
		tf.tf_i[HIOFFSET] = normhipart;
		frac = tf.tf_d - UNITBIT32;
		sf1 = saddr[0];
		sf2 = saddr[1];
		cf1 = caddr[0];
		cf2 = caddr[1];
		in++;
		*out++ = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
	}
#endif
#if 1			/* this is the same, unwrapped by hand. prolog beg*/
	n /= 4;
	norm_freq = *in * sr;
	if(norm_freq < 0.0001f)
		norm_freq = 0.0001f;
	else if(norm_freq > 0.9f)
		norm_freq = 0.9f;
	dphase = (double)(norm_freq * (float)(COSTABSIZE)) + UNITBIT32;
	tf.tf_d = dphase;
	mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
	saddr = stab + (mytfi);
	caddr = ctab + (mytfi);
	tf.tf_i[HIOFFSET] = normhipart;		
	in += 4;							   /*prolog end*/
	while (--n)
	{
		norm_freq = *in * sr;
		if(norm_freq < 0.0001f)
			norm_freq = 0.0001f;
		else if(norm_freq > 0.9f)
			norm_freq = 0.9f;
		dphase = (double)(norm_freq * (float)(COSTABSIZE)) + UNITBIT32;
		frac = tf.tf_d - UNITBIT32;
		tf.tf_d = dphase;
		sf1 = saddr[0];
		sf2 = saddr[1];
		cf1 = caddr[0];
		cf2 = caddr[1];
		mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
		saddr = stab + (mytfi);
		caddr = ctab + (mytfi);
		hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
		*out++ = hout;
		*out++ = hout;
		*out++ = hout;
		*out++ = hout;
		in += 4;
		tf.tf_i[HIOFFSET] = normhipart;
	}/*epilog beg*/
	frac = tf.tf_d - UNITBIT32;
	sf1 = saddr[0];
	sf2 = saddr[1];
	cf1 = caddr[0];
	cf2 = caddr[1];
	hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
	*out++ = hout;
	*out++ = hout;
	*out++ = hout;
	*out++ = hout;
	/*epilog end*/
#endif
	return (w+5);
}

static void sigiem_cot4_dsp(t_sigiem_cot4 *x, t_signal **sp)
{
	x->x_sr = 2.0f / (float)sp[0]->s_sr;
	dsp_add(sigiem_cot4_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}

static void sigiem_cot4_maketable(void)
{
	int i;
	float *fp, phase, fff, phsinc = 0.5*3.141592653 / ((float)COSTABSIZE);
	union tabfudge tf;

	if(!iem_cot4_table_sin)
	{
		iem_cot4_table_sin = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
		for(i=COSTABSIZE+1, fp=iem_cot4_table_sin, phase=0; i--; fp++, phase+=phsinc)
			*fp = sin(phase);
	}
	if(!iem_cot4_table_cos)
	{
		iem_cot4_table_cos = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
		for(i=COSTABSIZE+1, fp=iem_cot4_table_cos, phase=0; i--; fp++, phase+=phsinc)
			*fp = cos(phase);
	}
	tf.tf_d = UNITBIT32 + 0.5;
	if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
		bug("iem_cot4~: unexpected machine alignment");
}

static void *sigiem_cot4_new(void)
{
	t_sigiem_cot4 *x = (t_sigiem_cot4 *)pd_new(sigiem_cot4_class);

	outlet_new(&x->x_obj, gensym("signal"));
	x->x_msi = 0;
	return (x);
}

void sigiem_cot4_setup(void)
{
	sigiem_cot4_class = class_new(gensym("iem_cot4~"), (t_newmethod)sigiem_cot4_new, 0,
				 sizeof(t_sigiem_cot4), 0, 0);
	class_addcreator((t_newmethod)sigiem_cot4_new, gensym("iem_cot~"), 0);
	CLASS_MAINSIGNALIN(sigiem_cot4_class, t_sigiem_cot4, x_msi);
	class_addmethod(sigiem_cot4_class, (t_method)sigiem_cot4_dsp, gensym("dsp"), 0);
	sigiem_cot4_maketable();
	class_sethelpsymbol(sigiem_cot4_class, gensym("iemhelp/help-iem_cot4~"));
}