From d6b088044e161a27d49df537bbb6d998a8d0e50d Mon Sep 17 00:00:00 2001
From: musil <tmusil@users.sourceforge.net>
Date: Sat, 9 Dec 2006 02:00:52 +0000
Subject: // class_sethelpsymbol(); changed help-*.pd to *-help.pd chanded file
 structure to standard 1st step remove old

svn path=/trunk/externals/iemlib/; revision=6756
---
 iemlib1/src/lp1_t~.c | 210 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 210 insertions(+)
 create mode 100644 iemlib1/src/lp1_t~.c

(limited to 'iemlib1/src/lp1_t~.c')

diff --git a/iemlib1/src/lp1_t~.c b/iemlib1/src/lp1_t~.c
new file mode 100644
index 0000000..a4a625f
--- /dev/null
+++ b/iemlib1/src/lp1_t~.c
@@ -0,0 +1,210 @@
+/* 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 - 2006 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* -- lp1_t~ - slow dynamic lowpass-filter 1. order with tau input --- */
+
+typedef struct _lp1_t_tilde
+{
+  t_object  x_obj;
+  t_float   yn1;
+  t_float   c0;
+  t_float   c1;
+  t_float   sr;
+  t_float   cur_t;
+  t_float   delta_t;
+  t_float   end_t;
+  t_float   ticks_per_interpol_time;
+  t_float   rcp_ticks;
+  t_float   interpol_time;
+  int       ticks;
+  int       counter_t;
+  t_float   x_msi;
+} t_lp1_t_tilde;
+
+t_class *lp1_t_tilde_class;
+
+static void lp1_t_tilde_dsp_tick(t_lp1_t_tilde *x)
+{
+  if(x->counter_t)
+  {
+    if(x->counter_t <= 1)
+    {
+      x->cur_t = x->end_t;
+      x->counter_t = 0;
+    }
+    else
+    {
+      x->counter_t--;
+      x->cur_t += x->delta_t;
+    }
+    if(x->cur_t == 0.0f)
+      x->c1 = 0.0f;
+    else
+      x->c1 = exp((x->sr)/x->cur_t);
+    x->c0 = 1.0f - x->c1;
+  }
+}
+
+static t_int *lp1_t_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_lp1_t_tilde *x = (t_lp1_t_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float yn0, yn1=x->yn1;
+  t_float c0=x->c0, c1=x->c1;
+  
+  lp1_t_tilde_dsp_tick(x);
+  for(i=0; i<n; i++)
+  {
+    yn0 = (*in++)*c0 + yn1*c1;
+    *out++ = yn0;
+    yn1 = yn0;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(yn1))
+    yn1 = 0.0f;
+  x->yn1 = yn1;
+  return(w+5);
+}
+
+static t_int *lp1_t_tilde_perf8(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_lp1_t_tilde *x = (t_lp1_t_tilde *)(w[3]);
+  int i, n = (t_int)(w[4]);
+  t_float yn[9];
+  t_float c0=x->c0, c1=x->c1;
+  
+  lp1_t_tilde_dsp_tick(x);
+  yn[0] = x->yn1;
+  for(i=0; i<n; i+=8, in+=8, out+=8)
+  {
+    yn[1] = in[0]*c0 + yn[0]*c1;
+    out[0] = yn[1];
+    yn[2] = in[1]*c0 + yn[1]*c1;
+    out[1] = yn[2];
+    yn[3] = in[2]*c0 + yn[2]*c1;
+    out[2] = yn[3];
+    yn[4] = in[3]*c0 + yn[3]*c1;
+    out[3] = yn[4];
+    yn[5] = in[4]*c0 + yn[4]*c1;
+    out[4] = yn[5];
+    yn[6] = in[5]*c0 + yn[5]*c1;
+    out[5] = yn[6];
+    yn[7] = in[6]*c0 + yn[6]*c1;
+    out[6] = yn[7];
+    yn[8] = in[7]*c0 + yn[7]*c1;
+    out[7] = yn[8];
+    yn[0] = yn[8];
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(yn[0]))
+    yn[0] = 0.0f;
+  
+  x->yn1 = yn[0];
+  return(w+5);
+}
+
+static void lp1_t_tilde_ft2(t_lp1_t_tilde *x, t_floatarg t)
+{
+  int i = (int)((x->ticks_per_interpol_time)*t);
+  
+  x->interpol_time = t;
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+}
+
+static void lp1_t_tilde_ft1(t_lp1_t_tilde *x, t_floatarg time_const)
+{
+  if(time_const < 0.0f)
+    time_const = 0.0f;
+  if(time_const != x->cur_t)
+  {
+    x->end_t = time_const;
+    x->counter_t = x->ticks;
+    x->delta_t = (time_const - x->cur_t) * x->rcp_ticks;
+  }
+}
+
+static void lp1_t_tilde_dsp(t_lp1_t_tilde *x, t_signal **sp)
+{
+  int i, n=(int)sp[0]->s_n;
+  
+  x->sr = -1000.0f / (t_float)(sp[0]->s_sr);
+  x->ticks_per_interpol_time = 0.001f * (t_float)(sp[0]->s_sr) / (t_float)n;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  if(x->cur_t == 0.0f)
+    x->c1 = 0.0f;
+  else
+    x->c1 = exp((x->sr)/x->cur_t);
+  x->c0 = 1.0f - x->c1;
+  if(n&7)
+    dsp_add(lp1_t_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+  else
+    dsp_add(lp1_t_tilde_perf8, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+}
+
+static void *lp1_t_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_lp1_t_tilde *x = (t_lp1_t_tilde *)pd_new(lp1_t_tilde_class);
+  int i;
+  t_float time_const=0.0f, interpol=0.0f;
+  
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  x->counter_t = 1;
+  x->delta_t = 0.0f;
+  x->interpol_time = 0.0f;
+  x->yn1 = 0.0f;
+  x->sr = -1.0f / 44.1f;
+  if((argc >= 1)&&IS_A_FLOAT(argv,0))
+    time_const = (t_float)atom_getfloatarg(0, argc, argv);
+  if((argc >= 2)&&IS_A_FLOAT(argv,1))
+    interpol = (t_float)atom_getfloatarg(1, argc, argv);
+  if(time_const < 0.0f)
+    time_const = 0.0f;
+  x->cur_t = time_const;
+  if(time_const == 0.0f)
+    x->c1 = 0.0f;
+  else
+    x->c1 = exp((x->sr)/time_const);
+  x->c0 = 1.0f - x->c1;
+  if(interpol < 0.0f)
+    interpol = 0.0f;
+  x->interpol_time = interpol;
+  x->ticks_per_interpol_time = 0.5f;
+  i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
+  if(i <= 0)
+    i = 1;
+  x->ticks = i;
+  x->rcp_ticks = 1.0f / (t_float)i;
+  x->end_t = x->cur_t;
+  return (x);
+}
+
+void lp1_t_tilde_setup(void)
+{
+  lp1_t_tilde_class = class_new(gensym("lp1_t~"), (t_newmethod)lp1_t_tilde_new,
+        0, sizeof(t_lp1_t_tilde), 0, A_GIMME, 0);
+  CLASS_MAINSIGNALIN(lp1_t_tilde_class, t_lp1_t_tilde, x_msi);
+  class_addmethod(lp1_t_tilde_class, (t_method)lp1_t_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(lp1_t_tilde_class, (t_method)lp1_t_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(lp1_t_tilde_class, (t_method)lp1_t_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
+//  class_sethelpsymbol(lp1_t_tilde_class, gensym("iemhelp/help-lp1_t~"));
+}
-- 
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