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-rw-r--r--iemlib1/src/peakenv~.c95
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diff --git a/iemlib1/src/peakenv~.c b/iemlib1/src/peakenv~.c
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+/* 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~"));
+}