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/***************************************************************************
* File: ln~.c
* Auth: Iain Mott [iain.mott@bigpond.com]
* Maintainer: Iain Mott [iain.mott@bigpond.com]
* Version: Part of motex_1.1.2
* Date: January 2001
*
* Description: Pd signal external. Finds natural log of signal. Optional argument '-1' finfs inverse.
*
* Copyright (C) 2001 by Iain Mott [iain.mott@bigpond.com]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License, which should be included with this
* program, for more details.
*
****************************************************************************/
#include "math.h"
#include <m_pd.h>
/* ----------------------------- ln ----------------------------- */
static t_class *ln_class;
#define INVTWOPI 0.15915494f
typedef struct _ln
{
t_object x_obj;
int flag;
} t_ln;
/* static void *ln_new(t_symbol *s, int argc, t_atom *argv) */
static void *ln_new(t_floatarg f)
{
/* if (argc > 1) */
/* post("+~: extra arguments ignored"); */
/* { */
t_ln *x = (t_ln *)pd_new(ln_class);
outlet_new(&x->x_obj, &s_signal);
x->flag = f;
return (x);
/* } */
}
t_int *ln_perform(t_int *w)
{
t_float *in1 = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
int flag = (int)(w[4]);
if(flag != -1)
while (n--) *out++ = (t_float) log(*in1++);
else
while (n--) *out++ = (t_float) exp(*in1++);
return (w+5);
}
t_int *ln_perf8(t_int *w)
{
t_float *in1 = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
int flag = (int)(w[4]);
if(flag != -1)
{
for (; n; n -= 8, in1 += 8, out += 8)
{
float f0 = in1[0], f1 = in1[1], f2 = in1[2], f3 = in1[3];
float f4 = in1[4], f5 = in1[5], f6 = in1[6], f7 = in1[7];
out[0] = (t_float) log(f0);
out[1] = (t_float) log(f1);
out[2] = (t_float) log(f2);
out[3] = (t_float) log(f3);
out[4] = (t_float) log(f4);
out[5] = (t_float) log(f5);
out[6] = (t_float) log(f6);
out[7] = (t_float) log(f7);
}
}
else
{
for (; n; n -= 8, in1 += 8, out += 8)
{
float f0 = in1[0], f1 = in1[1], f2 = in1[2], f3 = in1[3];
float f4 = in1[4], f5 = in1[5], f6 = in1[6], f7 = in1[7];
out[0] = (t_float) exp(f0);
out[1] = (t_float) exp(f1);
out[2] = (t_float) exp(f2);
out[3] = (t_float) exp(f3);
out[4] = (t_float) exp(f4);
out[5] = (t_float) exp(f5);
out[6] = (t_float) exp(f6);
out[7] = (t_float) exp(f7);
}
}
return (w+5);
}
void dsp_add_ln(t_sample *in1, t_sample *out, int n, int flag)
{
if (n&7)
dsp_add(ln_perform, 4, in1, out, n, flag);
else
dsp_add(ln_perf8, 4, in1, out, n, flag);
}
static void ln_dsp(t_ln *x, t_signal **sp)
{
dsp_add_ln(sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n, x->flag);
}
void ln_tilde_setup(void)
{
ln_class = class_new(gensym("ln~"), (t_newmethod)ln_new, 0,
sizeof(t_ln), 0, A_DEFFLOAT, 0);
class_addmethod(ln_class, nullfn, gensym("signal"), 0);
class_addmethod(ln_class, (t_method)ln_dsp, gensym("dsp"), 0);
}
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