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/peakenv~.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 iemlib1/src/peakenv~.c

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

diff --git a/iemlib1/src/peakenv~.c b/iemlib1/src/peakenv~.c
new file mode 100644
index 0000000..e821c1f
--- /dev/null
+++ b/iemlib1/src/peakenv~.c
@@ -0,0 +1,95 @@
+/* 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>
+
+/* ---------------- peakenv~ - simple peak-envelope-converter. ----------------- */
+
+typedef struct _peakenv_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_msi;
+} t_peakenv_tilde;
+
+t_class *peakenv_tilde_class;
+
+static void peakenv_tilde_reset(t_peakenv_tilde *x)
+{
+  x->x_old_peak = 0.0f;
+}
+
+static void peakenv_tilde_ft1(t_peakenv_tilde *x, t_floatarg f)/* release-time in ms */
+{
+  if(f < 0.0f)
+    f = 0.0f;
+  x->x_releasetime = f;
+  x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime));
+}
+
+static t_int *peakenv_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_peakenv_tilde *x = (t_peakenv_tilde *)(w[3]);
+  int n = (int)(w[4]);
+  t_float peak = x->x_old_peak;
+  t_float c1 = x->x_c1;
+  t_float absolute;
+  int i;
+  
+  for(i=0; i<n; i++)
+  {
+    absolute = fabs(*in++);
+    peak *= c1;
+    if(absolute > peak)
+      peak = absolute;
+    *out++ = peak;
+  }
+  /* NAN protect */
+  if(IEM_DENORMAL(peak))
+    peak = 0.0f;
+  x->x_old_peak = peak;
+  return(w+5);
+}
+
+static void peakenv_tilde_dsp(t_peakenv_tilde *x, t_signal **sp)
+{
+  x->x_sr = (t_float)sp[0]->s_sr;
+  peakenv_tilde_ft1(x, x->x_releasetime);
+  dsp_add(peakenv_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *peakenv_tilde_new(t_floatarg f)
+{
+  t_peakenv_tilde *x = (t_peakenv_tilde *)pd_new(peakenv_tilde_class);
+  
+  if(f <= 0.0f)
+    f = 0.0f;
+  x->x_sr = 44100.0f;
+  peakenv_tilde_ft1(x, f);
+  x->x_old_peak = 0.0f;
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0;
+  return(x);
+}
+
+void peakenv_tilde_setup(void)
+{
+  peakenv_tilde_class = class_new(gensym("peakenv~"), (t_newmethod)peakenv_tilde_new,
+    0, sizeof(t_peakenv_tilde), 0, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(peakenv_tilde_class, t_peakenv_tilde, x_msi);
+  class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_dsp, gensym("dsp"), 0);
+  class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
+  class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_reset, gensym("reset"), 0);
+//  class_sethelpsymbol(peakenv_tilde_class, gensym("iemhelp/help-peakenv~"));
+}
-- 
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