1 files changed, 121 insertions, 0 deletions
diff --git a/iemlib1/src/peakenv_hold~.c b/iemlib1/src/peakenv_hold~.c
new file mode 100644
index 0000000..9019527
--- /dev/null
+++ b/iemlib1/src/peakenv_hold~.c
@@ -0,0 +1,121 @@
+/* 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 - 2008 */
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+/* ---------------- peakenv_hold~ - simple peak-envelope-converter with peak hold time and release time. ----------------- */
+
+typedef struct _peakenv_hold_tilde
+{
+  t_object x_obj;
+  t_float  x_sr;
+  t_float  x_old_peak;
+  t_float  x_c1;
+  t_float  x_releasetime;
+  t_float  x_holdtime;
+  t_int    x_n_hold;
+  t_int    x_counter;
+  t_float  x_msi;
+} t_peakenv_hold_tilde;
+
+static t_class *peakenv_hold_tilde_class;
+
+static void peakenv_hold_tilde_reset(t_peakenv_hold_tilde *x)
+{
+  x->x_old_peak = 0.0f;
+}
+
+static void peakenv_hold_tilde_ft1(t_peakenv_hold_tilde *x, t_float t_hold)/* hold-time in ms */
+{
+  double dhold;
+  
+  if(t_hold < 0.0f)
+    t_hold = 0.0f;
+  x->x_holdtime = t_hold;
+  dhold = (double)x->x_sr*(double)0.001*(double)x->x_holdtime;
+  if(dhold > 2147483647.0)
+    dhold = 2147483647.0;
+  x->x_n_hold = (t_int)(dhold + (double)0.5);
+}
+
+static void peakenv_hold_tilde_ft2(t_peakenv_hold_tilde *x, t_float t_rel)/* release-time in ms */
+{
+  if(t_rel < 0.0f)
+    t_rel = 0.0f;
+  x->x_releasetime = t_rel;
+  x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime));
+}
+
+static t_int *peakenv_hold_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_peakenv_hold_tilde *x = (t_peakenv_hold_tilde *)(w[3]);
+  int n = (int)(w[4]);
+  t_float peak = x->x_old_peak;
+  t_float c1 = x->x_c1;
+  t_float absolute;
+  t_int i, counter;
+  
+  counter = x->x_counter;
+  for(i=0; i<n; i++)
+  {
+    absolute = fabs(*in++);
+    if(counter > 0)
+      counter--;// hold peride
+    else
+      peak *= c1;// release periode
+    if(absolute > peak)
+    {
+      peak = absolute;
+      counter = x->x_n_hold;// new hold initialisation
+    }
+    *out++ = peak;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(peak))
+    peak = 0.0f;
+  x->x_old_peak = peak;
+  x->x_counter = counter;
+  return(w+5);
+}
+
+static void peakenv_hold_tilde_dsp(t_peakenv_hold_tilde *x, t_signal **sp)
+{
+  x->x_sr = (t_float)sp[0]->s_sr;
+  peakenv_hold_tilde_ft1(x, x->x_holdtime);
+  peakenv_hold_tilde_ft2(x, x->x_releasetime);
+  dsp_add(peakenv_hold_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *peakenv_hold_tilde_new(t_float t_hold, t_float t_rel)
+{
+  t_peakenv_hold_tilde *x = (t_peakenv_hold_tilde *)pd_new(peakenv_hold_tilde_class);
+  
+  x->x_sr = 44100.0f;
+  peakenv_hold_tilde_ft1(x, t_hold);
+  peakenv_hold_tilde_ft2(x, t_rel);
+  x->x_old_peak = 0.0f;
+  x->x_counter = 0;
+  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;
+  return(x);
+}
+
+void peakenv_hold_tilde_setup(void)
+{
+  peakenv_hold_tilde_class = class_new(gensym("peakenv_hold~"), (t_newmethod)peakenv_hold_tilde_new,
+    0, sizeof(t_peakenv_hold_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(peakenv_hold_tilde_class, t_peakenv_hold_tilde, x_msi);
+  class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+   class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
+  class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_reset, gensym("reset"), 0);
+}