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-rw-r--r--src/z_sigaverage.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/src/z_sigaverage.c b/src/z_sigaverage.c
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--- /dev/null
+++ b/src/z_sigaverage.c
@@ -0,0 +1,287 @@
+#include "zexy.h"
+#include <math.h>
+
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#define sqrtf sqrt
+#endif
+
+/* ---------------- envrms~ - simple envelope follower. ----------------- */
+/* this is exactly the same as msp's env~-object, but does not output dB but RMS !! */
+/* i found env~+dbtorms most inconvenient (and expensive...) */
+
+#define MAXOVERLAP 10
+#define MAXVSTAKEN 64
+
+t_class *sigenvrms_class;
+
+typedef struct sigenvrms
+{
+ t_object x_obj; /* header */
+ void *x_outlet; /* a "float" outlet */
+ void *x_clock; /* a "clock" object */
+ float *x_buf; /* a Hanning window */
+ int x_phase; /* number of points since last output */
+ int x_period; /* requested period of output */
+ int x_realperiod; /* period rounded up to vecsize multiple */
+ int x_npoints; /* analysis window size in samples */
+ float x_result; /* result to output */
+ float x_sumbuf[MAXOVERLAP]; /* summing buffer */
+} t_sigenvrms;
+
+static void sigenvrms_tick(t_sigenvrms *x);
+
+static void *sigenvrms_new(t_floatarg fnpoints, t_floatarg fperiod)
+{
+ int npoints = fnpoints;
+ int period = fperiod;
+ t_sigenvrms *x;
+ float *buf;
+ int i;
+
+ if (npoints < 1) npoints = 1024;
+ if (period < 1) period = npoints/2;
+ if (period < npoints / MAXOVERLAP + 1)
+ period = npoints / MAXOVERLAP + 1;
+ if (!(buf = getbytes(sizeof(float) * (npoints + MAXVSTAKEN))))
+ {
+ error("env: couldn't allocate buffer");
+ return (0);
+ }
+ x = (t_sigenvrms *)pd_new(sigenvrms_class);
+ x->x_buf = buf;
+ x->x_npoints = npoints;
+ x->x_phase = 0;
+ x->x_period = period;
+ for (i = 0; i < MAXOVERLAP; i++) x->x_sumbuf[i] = 0;
+ for (i = 0; i < npoints; i++)
+ buf[i] = (1. - cos((2 * 3.141592654 * i) / npoints))/npoints;
+ for (; i < npoints+MAXVSTAKEN; i++) buf[i] = 0;
+ x->x_clock = clock_new(x, (t_method)sigenvrms_tick);
+ x->x_outlet = outlet_new(&x->x_obj, gensym("float"));
+ return (x);
+}
+
+static t_int *sigenvrms_perform(t_int *w)
+{
+ t_sigenvrms *x = (t_sigenvrms *)(w[1]);
+ t_float *in = (t_float *)(w[2]);
+ int n = (int)(w[3]);
+ int count;
+ float *sump;
+ in += n;
+ for (count = x->x_phase, sump = x->x_sumbuf;
+ count < x->x_npoints; count += x->x_realperiod, sump++)
+ {
+ float *hp = x->x_buf + count;
+ float *fp = in;
+ float sum = *sump;
+ int i;
+
+ for (i = 0; i < n; i++)
+ {
+ fp--;
+ sum += *hp++ * (*fp * *fp);
+ }
+ *sump = sum;
+ }
+ sump[0] = 0;
+ x->x_phase -= n;
+ if (x->x_phase < 0)
+ {
+ x->x_result = x->x_sumbuf[0];
+ for (count = x->x_realperiod, sump = x->x_sumbuf;
+ count < x->x_npoints; count += x->x_realperiod, sump++)
+ sump[0] = sump[1];
+ sump[0] = 0;
+ x->x_phase = x->x_realperiod - n;
+ clock_delay(x->x_clock, 0L);
+ }
+ return (w+4);
+}
+
+static void sigenvrms_dsp(t_sigenvrms *x, t_signal **sp)
+{
+ if (x->x_period % sp[0]->s_n) x->x_realperiod =
+ x->x_period + sp[0]->s_n - (x->x_period % sp[0]->s_n);
+ else x->x_realperiod = x->x_period;
+ dsp_add(sigenvrms_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+ if (sp[0]->s_n > MAXVSTAKEN) bug("sigenvrms_dsp");
+}
+
+static void sigenvrms_tick(t_sigenvrms *x) /* callback function for the clock */
+{
+ outlet_float(x->x_outlet, sqrtf(x->x_result));
+}
+
+static void sigenvrms_ff(t_sigenvrms *x) /* cleanup on free */
+{
+ clock_free(x->x_clock);
+ freebytes(x->x_buf, (x->x_npoints + MAXVSTAKEN) * sizeof(float));
+}
+
+static void sigenvrms_help(void)
+{
+ post("envrms~\t:: envelope follower that does output rms instead of dB");
+}
+
+
+void sigenvrms_setup(void )
+{
+ sigenvrms_class = class_new(gensym("envrms~"), (t_newmethod)sigenvrms_new,
+ (t_method)sigenvrms_ff, sizeof(t_sigenvrms), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addmethod(sigenvrms_class, nullfn, gensym("signal"), 0);
+ class_addmethod(sigenvrms_class, (t_method)sigenvrms_dsp, gensym("dsp"), 0);
+
+ class_addmethod(sigenvrms_class, (t_method)sigenvrms_help, gensym("help"), 0);
+ class_sethelpsymbol(sigenvrms_class, gensym("zexy/envrms~"));
+}
+
+/* ------------------------ average~ ----------------------------- */
+
+/* tilde object to take absolute value. */
+
+static t_class *avg_class;
+
+typedef struct _avg
+{
+ t_object x_obj;
+
+ t_float n_inv;
+ t_float buf;
+ int blocks;
+} t_avg;
+
+
+/* average :: arithmetic mean of one signal-vector */
+
+static t_int *avg_perform(t_int *w)
+{
+ t_float *in = (t_float *)(w[1]);
+
+ t_avg *x = (t_avg *)w[2];
+ int n = (int)(w[3]);
+
+ t_float buf = 0.;
+
+ while (n--)
+ {
+ buf += *in++;
+ }
+ outlet_float(x->x_obj.ob_outlet, buf*x->n_inv);
+
+ return (w+4);
+}
+
+static void avg_dsp(t_avg *x, t_signal **sp)
+{
+ x->n_inv=1./sp[0]->s_n;
+ dsp_add(avg_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+static void *avg_new(void)
+{
+ t_avg *x = (t_avg *)pd_new(avg_class);
+ outlet_new(&x->x_obj, gensym("float"));
+ return (x);
+}
+
+static void avg_help(void)
+{
+ post("avg~\t:: outputs the arithmetic mean of each signal-vector");
+}
+
+
+void avg_setup(void)
+{
+ avg_class = class_new(gensym("avg~"), (t_newmethod)avg_new, 0,
+ sizeof(t_avg), 0, A_DEFFLOAT, 0);
+ class_addmethod(avg_class, nullfn, gensym("signal"), 0);
+ class_addmethod(avg_class, (t_method)avg_dsp, gensym("dsp"), 0);
+
+ class_addmethod(avg_class, (t_method)avg_help, gensym("help"), 0);
+ class_sethelpsymbol(avg_class, gensym("zexy/avg~"));
+}
+
+
+/* triggered average :: arithmetic mean between last and current BANG */
+
+static t_class *tavg_class;
+
+typedef struct _tavg
+{
+ t_object x_obj;
+
+ t_float n_inv;
+ t_float buf;
+ int blocks;
+} t_tavg;
+
+
+
+static void tavg_bang(t_avg *x)
+{
+ if (x->blocks) {
+ outlet_float(x->x_obj.ob_outlet, x->buf*x->n_inv/x->blocks);
+ x->blocks = 0;
+ x->buf = 0.;
+ }
+}
+
+static t_int *tavg_perform(t_int *w)
+{
+ t_float *in = (t_float *)(w[1]);
+ t_tavg *x = (t_tavg *)w[2];
+ int n = (int)(w[3]);
+
+ t_float buf = x->buf;
+
+ while (n--) buf += *in++;
+
+ x->buf = buf;
+ x->blocks++;
+
+ return (w+4);
+}
+
+static void tavg_dsp(t_tavg *x, t_signal **sp)
+{
+ x->n_inv=1./sp[0]->s_n;
+ dsp_add(tavg_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+static void *tavg_new(void)
+{
+ t_tavg *x = (t_tavg *)pd_new(tavg_class);
+ outlet_new(&x->x_obj, gensym("float"));
+ return (x);
+}
+
+static void tavg_help(void)
+{
+ post("tavg~\t\t:: outputs the arithmetic mean of a signal when triggered");
+ post("<bang>\t\t: triggers the output");
+}
+
+void tavg_setup(void)
+{
+ tavg_class = class_new(gensym("tavg~"), (t_newmethod)tavg_new, 0,
+ sizeof(t_tavg), 0, A_DEFFLOAT, 0);
+ class_addmethod(tavg_class, nullfn, gensym("signal"), 0);
+ class_addmethod(tavg_class, (t_method)tavg_dsp, gensym("dsp"), 0);
+
+ class_addbang(tavg_class, tavg_bang);
+
+ class_addmethod(tavg_class, (t_method)tavg_help, gensym("help"), 0);
+ class_sethelpsymbol(tavg_class, gensym("zexy/tavg~"));
+}
+
+/* global setup routine */
+
+void z_sigaverage_setup(void)
+{
+ avg_setup();
+ tavg_setup();
+ sigenvrms_setup();
+}
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