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/* Copyright (c) 2002-2003 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include <math.h>
#include "m_pd.h"
#include "sickle/sic.h"
#if defined(NT) || defined(MACOSX)
/* cf pd/src/x_arithmetic.c */
#define logf log
#endif
#define LOG_MININPUT 1e-10 /* CHECKED */
typedef struct _log
{
t_sic x_sic;
t_float x_rcplogbase; /* LATER consider using double (and log()) */
} t_log;
static t_class *log_class;
static void log_ft1(t_log *x, t_floatarg f)
{
x->x_rcplogbase = (f == 0. ? 1. : /* CHECKED no protection against NaNs */
(f == 1. ? 0. : /* CHECKED */
1. / logf(f)));
}
static t_int *log_perform(t_int *w)
{
int nblock = (int)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
t_float rcplogbase = *(t_float *)(w[4]);
if (rcplogbase != 0.)
{
while (nblock--)
{
float f = *in++;
if (f < LOG_MININPUT)
f = LOG_MININPUT; /* CHECKED */
*out++ = logf(f) * rcplogbase;
}
}
else while (nblock--) *out++ = 0.;
return (w + 5);
}
static void log_dsp(t_log *x, t_signal **sp)
{
dsp_add(log_perform, 4, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec,
&x->x_rcplogbase);
}
static void *log_new(t_floatarg f)
{
t_log *x = (t_log *)pd_new(log_class);
inlet_new((t_object *)x, (t_pd *)x, &s_float, gensym("ft1"));
outlet_new((t_object *)x, &s_signal);
log_ft1(x, f);
return (x);
}
void log_tilde_setup(void)
{
log_class = class_new(gensym("log~"),
(t_newmethod)log_new, 0,
sizeof(t_log), 0, A_DEFFLOAT, 0);
sic_setup(log_class, log_dsp, SIC_FLOATTOSIGNAL);
class_addmethod(log_class, (t_method)log_ft1,
gensym("ft1"), A_FLOAT, 0);
}
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