diff options
Diffstat (limited to 'src/iemlib2/sigfade.c')
-rw-r--r-- | src/iemlib2/sigfade.c | 368 |
1 files changed, 184 insertions, 184 deletions
diff --git a/src/iemlib2/sigfade.c b/src/iemlib2/sigfade.c index 5821e1f..01af035 100644 --- a/src/iemlib2/sigfade.c +++ b/src/iemlib2/sigfade.c @@ -1,184 +1,184 @@ -/* 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, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
-
-#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~ ----------------------------- */
-/* --- signal lookup tabel object with input range of 0 to 1 --- */
-/* ---- converts a linear signal ramp to the half of a : ------ */
-/* -- sine-wave, hanning-wave, squareroot-wave or mixes of it -- */
-
-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();
-}
+/* 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, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */ + +#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~ ----------------------------- */ +/* --- signal lookup tabel object with input range of 0 to 1 --- */ +/* ---- converts a linear signal ramp to the half of a : ------ */ +/* -- sine-wave, hanning-wave, squareroot-wave or mixes of it -- */ + +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(); +} |