renamed *_tilde.c-files to *~.c

svn path=/trunk/externals/zexy/; revision=2998

1 files changed, 150 insertions, 0 deletions

diff --git a/src/envrms~.c b/src/envrms~.c
new file mode 100644
index 0000000..e9dc302
--- /dev/null
+++ b/src/envrms~.c
@@ -0,0 +1,150 @@
+/******************************************************
+ *
+ * zexy - implementation file
+ *
+ * copyleft (c) IOhannes m zmölnig
+ *
+ *   1999:forum::für::umläute:2004
+ *
+ *   institute of electronic music and acoustics (iem)
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+/* ---------------- 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...) */
+
+#include "zexy.h"
+#include <math.h>
+
+#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 envrms_tilde_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~"));
+  zexy_register("envrms~");
+}