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Viewing changes to lmin.c

  • Committer: Bazaar Package Importer
  • Author(s): Hans-Christoph Steiner
  • Date: 2010-11-10 15:17:58 UTC
  • Revision ID: james.westby@ubuntu.com-20101110151758-3acjf69kiudo3gh4
Tags: upstream-0.12.1
Import upstream version 0.12.1

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lmin.c
 
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#include "defines.h"
 
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/*--------------- lmin ---------------*/
 
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static t_class *lmin_class;
 
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typedef struct _lmin
 
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{
 
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    t_object x_obj;
 
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        float m_min;
 
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        float m_leak;
 
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        float m_c_leak;
 
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} t_lmin;
 
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static void lmin_perform(t_lmin *x, t_float in)
 
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{
 
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        x->m_min=(in < x->m_min) ? in : x->m_min * x->m_c_leak + in * x->m_leak;
 
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    outlet_float(x->x_obj.ob_outlet, x->m_min);
 
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}
 
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static void lmin_setHalfDecay(t_lmin *x, t_float halfDecayTime)
 
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{
 
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        x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime));
 
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        x->m_leak=1.0f-x->m_c_leak;
 
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}
 
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static void lmin_clear(t_lmin *x)
 
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{
 
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        x->m_min= MAXFLOAT;
 
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}
 
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static void *lmin_new( t_float halfDecayTime)
 
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{
 
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        t_lmin *x=(t_lmin *)pd_new(lmin_class);
 
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        outlet_new(&x->x_obj, gensym("float"));
 
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        lmin_setHalfDecay(x, halfDecayTime);
 
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        lmin_clear(x);
 
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        return (void *)x;
 
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}
 
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void lmin_setup(void)
 
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{
 
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    lmin_class = class_new(gensym("lmin"),
 
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        (t_newmethod)lmin_new, 0,
 
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                sizeof(t_lmin), 
 
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                CLASS_DEFAULT,
 
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            A_DEFFLOAT, 0);
 
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    class_addfloat(lmin_class, (t_method)lmin_perform);
 
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        class_addmethod(lmin_class, (t_method)lmin_clear,
 
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        gensym("clear"), A_GIMME, NULL);
 
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        class_addmethod(lmin_class, (t_method)lmin_setHalfDecay,
 
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        gensym("decay"), A_DEFFLOAT, NULL);
 
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}
 
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