From 086e6b358ad45bda0e6a948cfb7ea2d33ab7da5a Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Wed, 10 Feb 2010 00:34:05 +0000 Subject: re-arranged into libdir and setup with the template Makefile+debian stuff. renabled vv+ and vv- as vvplus and vvminus svn path=/trunk/externals/smlib/; revision=13158 --- lstd.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 lstd.c (limited to 'lstd.c') diff --git a/lstd.c b/lstd.c new file mode 100644 index 0000000..1873bda --- /dev/null +++ b/lstd.c @@ -0,0 +1,60 @@ +#include "defines.h" + +/*--------------- lstd ---------------*/ + +static t_class *lstd_class; + +typedef struct _lstd +{ + t_object x_obj; + float m_avg; + float m_sum_squares; + float m_std; + float m_c_leak; + float m_leak; +} t_lstd; + + +static void lstd_perform(t_lstd *x, t_float in) +{ + float tmp=x->m_avg-in; + x->m_avg= x->m_avg * x->m_c_leak + in * x->m_leak; + x->m_sum_squares=x->m_sum_squares * x->m_c_leak + x->m_leak*tmp*tmp; + x->m_std=(float)sqrtf(x->m_sum_squares); + outlet_float(x->x_obj.ob_outlet, x->m_std); +} + +static void lstd_setHalfDecay(t_lstd *x, t_float halfDecayTime) +{ + x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime)); + x->m_leak=1.0f-x->m_c_leak; +} + +static void lstd_clear(t_lstd *x) +{ + x->m_sum_squares=0.0f; + x->m_avg=0.0f; +} + +static void *lstd_new( t_float halfDecayTime) +{ + t_lstd *x=(t_lstd *)pd_new(lstd_class); + outlet_new(&x->x_obj, gensym("float")); + + lstd_setHalfDecay(x, halfDecayTime); + return (void *)x; +} + + +void lstd_setup(void) +{ + lstd_class = class_new(gensym("lstd"), + (t_newmethod)lstd_new, 0, + sizeof(t_lstd), + CLASS_DEFAULT, + A_DEFFLOAT, 0); + class_addfloat(lstd_class, (t_method)lstd_perform); + class_addmethod(lstd_class, (t_method)lstd_setHalfDecay, + gensym("decay"), A_DEFFLOAT, NULL); +} + -- cgit v1.2.1