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-rw-r--r--src/iemlib2/sigfade.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/iemlib2/sigfade.c b/src/iemlib2/sigfade.c
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+++ b/src/iemlib2/sigfade.c
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+/* Copyright (c) 1997-2003 Miller Puckette.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib2 written by Thomas Musil (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 <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <math.h>
+
+/* ------------------------ fade~ ----------------------------- */
+
+float *iem_fade_table_lin=(float *)0L;
+float *iem_fade_table_linsqrt=(float *)0L;
+float *iem_fade_table_sqrt=(float *)0L;
+float *iem_fade_table_sin=(float *)0L;
+float *iem_fade_table_sinhann=(float *)0L;
+float *iem_fade_table_hann=(float *)0L;
+
+static t_class *sigfade_class;
+
+typedef struct _sigfade
+{
+ t_object x_obj;
+ float *x_table;
+ float x_f;
+} t_sigfade;
+
+static void sigfade_set(t_sigfade *x, t_symbol *s)
+{
+ if(!strcmp(s->s_name, "_lin"))
+ x->x_table = iem_fade_table_lin;
+ else if(!strcmp(s->s_name, "_linsqrt"))
+ x->x_table = iem_fade_table_linsqrt;
+ else if(!strcmp(s->s_name, "_sqrt"))
+ x->x_table = iem_fade_table_sqrt;
+ else if(!strcmp(s->s_name, "_sin"))
+ x->x_table = iem_fade_table_sin;
+ else if(!strcmp(s->s_name, "_sinhann"))
+ x->x_table = iem_fade_table_sinhann;
+ else if(!strcmp(s->s_name, "_hann"))
+ x->x_table = iem_fade_table_hann;
+}
+
+static void *sigfade_new(t_symbol *s)
+{
+ t_sigfade *x = (t_sigfade *)pd_new(sigfade_class);
+ outlet_new(&x->x_obj, gensym("signal"));
+ x->x_f = 0;
+ x->x_table = iem_fade_table_lin;
+ sigfade_set(x, s);
+ return (x);
+}
+
+static t_int *sigfade_perform(t_int *w)
+{
+ t_float *in = (t_float *)(w[1]);
+ t_float *out = (t_float *)(w[2]);
+ t_sigfade *x = (t_sigfade *)(w[3]);
+ int n = (int)(w[4]);
+ float *tab = x->x_table, *addr, f1, f2, frac;
+ double dphase;
+ int normhipart;
+ union tabfudge tf;
+
+ tf.tf_d = UNITBIT32;
+ normhipart = tf.tf_i[HIOFFSET];
+
+#if 0 /* this is the readable version of the code. */
+ while (n--)
+ {
+ dphase = (double)(*in++ * (float)(COSTABSIZE) * 0.99999) + UNITBIT32;
+ tf.tf_d = dphase;
+ addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
+ tf.tf_i[HIOFFSET] = normhipart;
+ frac = tf.tf_d - UNITBIT32;
+ f1 = addr[0];
+ f2 = addr[1];
+ *out++ = f1 + frac * (f2 - f1);
+ }
+#endif
+#if 1 /* this is the same, unwrapped by hand. */
+ dphase = (double)(*in++ * (float)(COSTABSIZE) * 0.99999) + UNITBIT32;
+ tf.tf_d = dphase;
+ addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
+ tf.tf_i[HIOFFSET] = normhipart;
+ while (--n)
+ {
+ dphase = (double)(*in++ * (float)(COSTABSIZE) * 0.99999) + UNITBIT32;
+ frac = tf.tf_d - UNITBIT32;
+ tf.tf_d = dphase;
+ f1 = addr[0];
+ f2 = addr[1];
+ addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
+ *out++ = f1 + frac * (f2 - f1);
+ tf.tf_i[HIOFFSET] = normhipart;
+ }
+ frac = tf.tf_d - UNITBIT32;
+ f1 = addr[0];
+ f2 = addr[1];
+ *out++ = f1 + frac * (f2 - f1);
+#endif
+ return (w+5);
+}
+
+static void sigfade_dsp(t_sigfade *x, t_signal **sp)
+{
+ dsp_add(sigfade_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void sigfade_maketable(void)
+{
+ int i;
+ float *fp, phase, fff,phsinc = 0.5*3.141592653 / ((float)COSTABSIZE*0.99999);
+ union tabfudge tf;
+
+ if(!iem_fade_table_sin)
+ {
+ iem_fade_table_sin = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
+ for(i=COSTABSIZE+1, fp=iem_fade_table_sin, phase=0; i--; fp++, phase+=phsinc)
+ *fp = sin(phase);
+ }
+ if(!iem_fade_table_sinhann)
+ {
+ iem_fade_table_sinhann = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
+ for(i=COSTABSIZE+1, fp=iem_fade_table_sinhann, phase=0; i--; fp++, phase+=phsinc)
+ {
+ fff = sin(phase);
+ *fp = fff*sqrt(fff);
+ }
+ }
+ if(!iem_fade_table_hann)
+ {
+ iem_fade_table_hann = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
+ for(i=COSTABSIZE+1, fp=iem_fade_table_hann, phase=0; i--; fp++, phase+=phsinc)
+ {
+ fff = sin(phase);
+ *fp = fff*fff;
+ }
+ }
+ phsinc = 1.0 / ((float)COSTABSIZE*0.99999);
+ if(!iem_fade_table_lin)
+ {
+ iem_fade_table_lin = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
+ for(i=COSTABSIZE+1, fp=iem_fade_table_lin, phase=0; i--; fp++, phase+=phsinc)
+ *fp = phase;
+ }
+ if(!iem_fade_table_linsqrt)
+ {
+ iem_fade_table_linsqrt = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
+ for(i=COSTABSIZE+1, fp=iem_fade_table_linsqrt, phase=0; i--; fp++, phase+=phsinc)
+ *fp = pow(phase, 0.75);
+ }
+ if(!iem_fade_table_sqrt)
+ {
+ iem_fade_table_sqrt = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
+ for(i=COSTABSIZE+1, fp=iem_fade_table_sqrt, phase=0; i--; fp++, phase+=phsinc)
+ *fp = sqrt(phase);
+ }
+ tf.tf_d = UNITBIT32 + 0.5;
+ if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
+ bug("fade~: unexpected machine alignment");
+}
+
+void sigfade_setup(void)
+{
+ sigfade_class = class_new(gensym("fade~"), (t_newmethod)sigfade_new, 0,
+ sizeof(t_sigfade), 0, A_DEFSYM, 0);
+ CLASS_MAINSIGNALIN(sigfade_class, t_sigfade, x_f);
+ class_addmethod(sigfade_class, (t_method)sigfade_dsp, gensym("dsp"), 0);
+ class_addmethod(sigfade_class, (t_method)sigfade_set, gensym("set"), A_DEFSYM, 0);
+ class_sethelpsymbol(sigfade_class, gensym("iemhelp/help-fade~"));
+ sigfade_maketable();
+}
+