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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 - 2005 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ---------------- rvu~ - simple peak&rms-vu-meter. ----------------- */
typedef struct _rvu_tilde
{
t_object x_obj;
void *x_clock_metro;
t_float x_metro_time;
t_float x_sum_rms;
t_float x_old_rms;
t_float x_rcp;
t_float x_sr;
t_float x_release_time;
t_float x_c1;
int x_started;
t_float x_msi;
} t_rvu_tilde;
t_class *rvu_tilde_class;
static void rvu_tilde_tick_metro(t_rvu_tilde *x);
static void rvu_tilde_reset(t_rvu_tilde *x)
{
outlet_float(x->x_obj.ob_outlet, -99.9f);
x->x_sum_rms = 0.0f;
x->x_old_rms = 0.0f;
clock_delay(x->x_clock_metro, x->x_metro_time);
}
static void rvu_tilde_stop(t_rvu_tilde *x)
{
clock_unset(x->x_clock_metro);
x->x_started = 0;
}
static void rvu_tilde_start(t_rvu_tilde *x)
{
clock_delay(x->x_clock_metro, x->x_metro_time);
x->x_started = 1;
}
static void rvu_tilde_float(t_rvu_tilde *x, t_floatarg f)
{
if(f == 0.0f)
{
clock_unset(x->x_clock_metro);
x->x_started = 0;
}
else
{
clock_delay(x->x_clock_metro, x->x_metro_time);
x->x_started = 1;
}
}
static void rvu_tilde_t_release(t_rvu_tilde *x, t_floatarg release_time)
{
if(release_time <= 5.0f)
release_time = 5.0f;
x->x_release_time = release_time;
x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
}
static void rvu_tilde_t_metro(t_rvu_tilde *x, t_floatarg metro_time)
{
if(metro_time <= 5.0f)
metro_time = 5.0f;
x->x_metro_time = metro_time;
x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
}
static t_int *rvu_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_rvu_tilde *x = (t_rvu_tilde *)(w[2]);
int n = (int)(w[3]);
t_float sum=x->x_sum_rms;
int i;
if(x->x_started)
{
for(i=0; i<n; i++)
{
sum += in[i]*in[i];
}
x->x_sum_rms = sum;
}
return(w+4);
}
static void rvu_tilde_dsp(t_rvu_tilde *x, t_signal **sp)
{
x->x_sr = 0.001*(t_float)sp[0]->s_sr;
x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
dsp_add(rvu_tilde_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
clock_delay(x->x_clock_metro, x->x_metro_time);
}
static void rvu_tilde_tick_metro(t_rvu_tilde *x)
{
t_float dbr, cur_rms, c1=x->x_c1;
cur_rms = (1.0f - c1)*x->x_sum_rms*x->x_rcp + c1*x->x_old_rms;
/* NAN protect */
if(IEM_DENORMAL(cur_rms))
cur_rms = 0.0f;
if(cur_rms <= 0.0000000001f)
dbr = -99.9f;
else if(cur_rms > 1000000.0f)
{
dbr = 60.0f;
x->x_old_rms = 1000000.0f;
}
else
dbr = 4.3429448195f*log(cur_rms);
x->x_sum_rms = 0.0f;
x->x_old_rms = cur_rms;
outlet_float(x->x_obj.ob_outlet, dbr);
clock_delay(x->x_clock_metro, x->x_metro_time);
}
static void rvu_tilde_ff(t_rvu_tilde *x)
{
clock_free(x->x_clock_metro);
}
static void *rvu_tilde_new(t_floatarg metro_time, t_floatarg release_time)
{
t_rvu_tilde *x=(t_rvu_tilde *)pd_new(rvu_tilde_class);
if(metro_time <= 0.0f)
metro_time = 300.0f;
if(metro_time <= 5.0f)
metro_time = 5.0f;
if(release_time <= 0.0f)
release_time = 300.0f;
if(release_time <= 5.0f)
release_time = 5.0f;
x->x_metro_time = metro_time;
x->x_release_time = release_time;
x->x_c1 = exp(-2.0f*x->x_metro_time/x->x_release_time);
x->x_sum_rms = 0.0f;
x->x_old_rms = 0.0f;
x->x_sr = 44.1f;
x->x_rcp = 1.0f/(x->x_sr*x->x_metro_time);
x->x_clock_metro = clock_new(x, (t_method)rvu_tilde_tick_metro);
x->x_started = 1;
outlet_new(&x->x_obj, &s_float);
x->x_msi = 0.0f;
return(x);
}
void rvu_tilde_setup(void)
{
rvu_tilde_class = class_new(gensym("rvu~"), (t_newmethod)rvu_tilde_new,
(t_method)rvu_tilde_ff, sizeof(t_rvu_tilde), 0,
A_DEFFLOAT, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(rvu_tilde_class, t_rvu_tilde, x_msi);
class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_dsp, gensym("dsp"), 0);
class_addfloat(rvu_tilde_class, rvu_tilde_float);
class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_reset, gensym("reset"), 0);
class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_start, gensym("start"), 0);
class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_stop, gensym("stop"), 0);
class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_t_release, gensym("t_release"), A_FLOAT, 0);
class_addmethod(rvu_tilde_class, (t_method)rvu_tilde_t_metro, gensym("t_metro"), A_FLOAT, 0);
class_sethelpsymbol(rvu_tilde_class, gensym("iemhelp/help-rvu~"));
}
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