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-rw-r--r--src/iemlib1/sigpeakenv.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/src/iemlib1/sigpeakenv.c b/src/iemlib1/sigpeakenv.c
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+++ b/src/iemlib1/sigpeakenv.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 - 2003 */
+
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+
+/* ---------------- peakenv~ - simple peak-envelope-converter. ----------------- */
+
+typedef struct sigpeakenv
+{
+ t_object x_obj;
+ float x_sr;
+ float x_old_peak;
+ float x_c1;
+ float x_releasetime;
+ float x_msi;
+} t_sigpeakenv;
+
+t_class *sigpeakenv_class;
+
+static void sigpeakenv_reset(t_sigpeakenv *x)
+{
+ x->x_old_peak = 0.0f;
+}
+
+static void sigpeakenv_ft1(t_sigpeakenv *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 *sigpeakenv_perform(t_int *w)
+{
+ float *in = (float *)(w[1]);
+ float *out = (float *)(w[2]);
+ t_sigpeakenv *x = (t_sigpeakenv *)(w[3]);
+ int n = (int)(w[4]);
+ float peak = x->x_old_peak;
+ float c1 = x->x_c1;
+ 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(PD_BADFLOAT(peak))
+ peak = 0.0f;
+ x->x_old_peak = peak;
+ return(w+5);
+}
+
+static void sigpeakenv_dsp(t_sigpeakenv *x, t_signal **sp)
+{
+ x->x_sr = (float)sp[0]->s_sr;
+ sigpeakenv_ft1(x, x->x_releasetime);
+ dsp_add(sigpeakenv_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *sigpeakenv_new(t_floatarg f)
+{
+ t_sigpeakenv *x = (t_sigpeakenv *)pd_new(sigpeakenv_class);
+
+ if(f <= 0.0f)
+ f = 0.0f;
+ x->x_sr = 44100.0f;
+ sigpeakenv_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 sigpeakenv_setup(void)
+{
+ sigpeakenv_class = class_new(gensym("peakenv~"), (t_newmethod)sigpeakenv_new,
+ 0, sizeof(t_sigpeakenv), 0, A_DEFFLOAT, 0);
+ CLASS_MAINSIGNALIN(sigpeakenv_class, t_sigpeakenv, x_msi);
+ class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_dsp, gensym("dsp"), 0);
+ class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_ft1, gensym("ft1"), A_FLOAT, 0);
+ class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_reset, gensym("reset"), 0);
+ class_sethelpsymbol(sigpeakenv_class, gensym("iemhelp/help-peakenv~"));
+}