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/* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* sinusoidal oscillator and table lookup; see also tabosc4~ in d_array.c.
*/
#include "m_pd.h"
#include "math.h"
#define UNITBIT32 1572864. /* 3*2^19; bit 32 has place value 1 */
#ifdef IRIX
#include <sys/endian.h>
#endif
#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__FreeBSD_kernel__) \
|| defined(__OpenBSD__)
#include <machine/endian.h>
#endif
#if defined(__linux__) || defined(__CYGWIN__) || defined(__GNU__) \
|| defined(__ANDROID__)
#include <endian.h>
#endif
#ifdef __MINGW32__
#include <sys/param.h>
#endif
#ifdef _MSC_VER
/* _MSVC lacks BYTE_ORDER and LITTLE_ENDIAN */
#define LITTLE_ENDIAN 0x0001
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)
#error No byte order defined
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
# define HIOFFSET 1
# define LOWOFFSET 0
#else
# define HIOFFSET 0 /* word offset to find MSB */
# define LOWOFFSET 1 /* word offset to find LSB */
#endif
union tabfudge
{
double tf_d;
int32_t tf_i[2];
};
/* -------------------------- phasor~ ------------------------------ */
static t_class *phasor_class, *scalarphasor_class;
#if 1 /* in the style of R. Hoeldrich (ICMC 1995 Banff) */
typedef struct _phasor
{
t_object x_obj;
double x_phase;
float x_conv;
float x_f; /* scalar frequency */
} t_phasor;
static void *phasor_new(t_floatarg f)
{
t_phasor *x = (t_phasor *)pd_new(phasor_class);
x->x_f = f;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
x->x_phase = 0;
x->x_conv = 0;
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
static t_int *phasor_perform(t_int *w)
{
t_phasor *x = (t_phasor *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
double dphase = x->x_phase + (double)UNITBIT32;
union tabfudge tf;
int normhipart;
float conv = x->x_conv;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
tf.tf_d = dphase;
while (n--)
{
tf.tf_i[HIOFFSET] = normhipart;
dphase += *in++ * conv;
*out++ = tf.tf_d - UNITBIT32;
tf.tf_d = dphase;
}
tf.tf_i[HIOFFSET] = normhipart;
x->x_phase = tf.tf_d - UNITBIT32;
return (w+5);
}
static void phasor_dsp(t_phasor *x, t_signal **sp)
{
x->x_conv = 1./sp[0]->s_sr;
dsp_add(phasor_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void phasor_ft1(t_phasor *x, t_float f)
{
x->x_phase = f;
}
static void phasor_setup(void)
{
phasor_class = class_new(gensym("phasor~"), (t_newmethod)phasor_new, 0,
sizeof(t_phasor), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(phasor_class, t_phasor, x_f);
class_addmethod(phasor_class, (t_method)phasor_dsp, gensym("dsp"), 0);
class_addmethod(phasor_class, (t_method)phasor_ft1,
gensym("ft1"), A_FLOAT, 0);
}
#endif /* Hoeldrich version */
/* ------------------------ cos~ ----------------------------- */
float *cos_table;
static t_class *cos_class;
typedef struct _cos
{
t_object x_obj;
float x_f;
} t_cos;
static void *cos_new(void)
{
t_cos *x = (t_cos *)pd_new(cos_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static t_int *cos_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
float *tab = cos_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)) + 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)) + 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)) + 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+4);
}
static void cos_dsp(t_cos *x, t_signal **sp)
{
dsp_add(cos_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void cos_maketable(void)
{
int i;
float *fp, phase, phsinc = (2. * 3.14159) / COSTABSIZE;
union tabfudge tf;
if (cos_table) return;
cos_table = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
for (i = COSTABSIZE + 1, fp = cos_table, phase = 0; i--;
fp++, phase += phsinc)
*fp = cos(phase);
/* here we check at startup whether the byte alignment
is as we declared it. If not, the code has to be
recompiled the other way. */
tf.tf_d = UNITBIT32 + 0.5;
if ((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
bug("cos~: unexpected machine alignment");
}
static void cos_setup(void)
{
cos_class = class_new(gensym("cos~"), (t_newmethod)cos_new, 0,
sizeof(t_cos), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(cos_class, t_cos, x_f);
class_addmethod(cos_class, (t_method)cos_dsp, gensym("dsp"), 0);
cos_maketable();
}
/* ------------------------ osc~ ----------------------------- */
static t_class *osc_class, *scalarosc_class;
typedef struct _osc
{
t_object x_obj;
double x_phase;
float x_conv;
float x_f; /* frequency if scalar */
} t_osc;
static void *osc_new(t_floatarg f)
{
t_osc *x = (t_osc *)pd_new(osc_class);
x->x_f = f;
outlet_new(&x->x_obj, gensym("signal"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
x->x_phase = 0;
x->x_conv = 0;
return (x);
}
static t_int *osc_perform(t_int *w)
{
t_osc *x = (t_osc *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
float *tab = cos_table, *addr, f1, f2, frac;
double dphase = x->x_phase + UNITBIT32;
int normhipart;
union tabfudge tf;
float conv = x->x_conv;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
#if 0
while (n--)
{
tf.tf_d = dphase;
dphase += *in++ * conv;
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
tf.tf_d = dphase;
dphase += *in++ * conv;
addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
tf.tf_i[HIOFFSET] = normhipart;
frac = tf.tf_d - UNITBIT32;
while (--n)
{
tf.tf_d = dphase;
f1 = addr[0];
dphase += *in++ * conv;
f2 = addr[1];
addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
tf.tf_i[HIOFFSET] = normhipart;
*out++ = f1 + frac * (f2 - f1);
frac = tf.tf_d - UNITBIT32;
}
f1 = addr[0];
f2 = addr[1];
*out++ = f1 + frac * (f2 - f1);
#endif
tf.tf_d = UNITBIT32 * COSTABSIZE;
normhipart = tf.tf_i[HIOFFSET];
tf.tf_d = dphase + (UNITBIT32 * COSTABSIZE - UNITBIT32);
tf.tf_i[HIOFFSET] = normhipart;
x->x_phase = tf.tf_d - UNITBIT32 * COSTABSIZE;
return (w+5);
}
static void osc_dsp(t_osc *x, t_signal **sp)
{
x->x_conv = COSTABSIZE/sp[0]->s_sr;
dsp_add(osc_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void osc_ft1(t_osc *x, t_float f)
{
x->x_phase = COSTABSIZE * f;
}
static void osc_setup(void)
{
osc_class = class_new(gensym("osc~"), (t_newmethod)osc_new, 0,
sizeof(t_osc), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(osc_class, t_osc, x_f);
class_addmethod(osc_class, (t_method)osc_dsp, gensym("dsp"), 0);
class_addmethod(osc_class, (t_method)osc_ft1, gensym("ft1"), A_FLOAT, 0);
cos_maketable();
}
/* ---------------- vcf~ - 2-pole bandpass filter. ----------------- */
typedef struct vcfctl
{
float c_re;
float c_im;
float c_q;
float c_isr;
} t_vcfctl;
typedef struct sigvcf
{
t_object x_obj;
t_vcfctl x_cspace;
t_vcfctl *x_ctl;
float x_f;
} t_sigvcf;
t_class *sigvcf_class;
static void *sigvcf_new(t_floatarg q)
{
t_sigvcf *x = (t_sigvcf *)pd_new(sigvcf_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
outlet_new(&x->x_obj, gensym("signal"));
outlet_new(&x->x_obj, gensym("signal"));
x->x_ctl = &x->x_cspace;
x->x_cspace.c_re = 0;
x->x_cspace.c_im = 0;
x->x_cspace.c_q = q;
x->x_cspace.c_isr = 0;
x->x_f = 0;
return (x);
}
static void sigvcf_ft1(t_sigvcf *x, t_floatarg f)
{
x->x_ctl->c_q = (f > 0 ? f : 0.f);
}
static t_int *sigvcf_perform(t_int *w)
{
float *in1 = (float *)(w[1]);
float *in2 = (float *)(w[2]);
float *out1 = (float *)(w[3]);
float *out2 = (float *)(w[4]);
t_vcfctl *c = (t_vcfctl *)(w[5]);
int n = (t_int)(w[6]);
int i;
float re = c->c_re, re2;
float im = c->c_im;
float q = c->c_q;
float qinv = (q > 0? 1.0f/q : 0);
float ampcorrect = 2.0f - 2.0f / (q + 2.0f);
float isr = c->c_isr;
float coefr, coefi;
float *tab = cos_table, *addr, f1, f2, frac;
double dphase;
int normhipart, tabindex;
union tabfudge tf;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
for (i = 0; i < n; i++)
{
float cf, cfindx, r, oneminusr;
cf = *in2++ * isr;
if (cf < 0) cf = 0;
cfindx = cf * (float)(COSTABSIZE/6.28318f);
r = (qinv > 0 ? 1 - cf * qinv : 0);
if (r < 0) r = 0;
oneminusr = 1.0f - r;
dphase = ((double)(cfindx)) + UNITBIT32;
tf.tf_d = dphase;
tabindex = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
addr = tab + tabindex;
tf.tf_i[HIOFFSET] = normhipart;
frac = tf.tf_d - UNITBIT32;
f1 = addr[0];
f2 = addr[1];
coefr = r * (f1 + frac * (f2 - f1));
addr = tab + ((tabindex - (COSTABSIZE/4)) & (COSTABSIZE-1));
f1 = addr[0];
f2 = addr[1];
coefi = r * (f1 + frac * (f2 - f1));
f1 = *in1++;
re2 = re;
*out1++ = re = ampcorrect * oneminusr * f1
+ coefr * re2 - coefi * im;
*out2++ = im = coefi * re2 + coefr * im;
}
if (PD_BIGORSMALL(re))
re = 0;
if (PD_BIGORSMALL(im))
im = 0;
c->c_re = re;
c->c_im = im;
return (w+7);
}
static void sigvcf_dsp(t_sigvcf *x, t_signal **sp)
{
x->x_ctl->c_isr = 6.28318f/sp[0]->s_sr;
dsp_add(sigvcf_perform, 6,
sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec,
x->x_ctl, sp[0]->s_n);
}
void sigvcf_setup(void)
{
sigvcf_class = class_new(gensym("vcf~"), (t_newmethod)sigvcf_new, 0,
sizeof(t_sigvcf), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(sigvcf_class, t_sigvcf, x_f);
class_addmethod(sigvcf_class, (t_method)sigvcf_dsp, gensym("dsp"), 0);
class_addmethod(sigvcf_class, (t_method)sigvcf_ft1,
gensym("ft1"), A_FLOAT, 0);
}
/* -------------------------- noise~ ------------------------------ */
static t_class *noise_class;
typedef struct _noise
{
t_object x_obj;
int x_val;
} t_noise;
static void *noise_new(void)
{
t_noise *x = (t_noise *)pd_new(noise_class);
static int init = 307;
x->x_val = (init *= 1319);
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
static t_int *noise_perform(t_int *w)
{
t_sample *out = (t_sample *)(w[1]);
int *vp = (int *)(w[2]);
int n = (int)(w[3]);
int val = *vp;
while (n--)
{
*out++ = ((float)((val & 0x7fffffff) - 0x40000000)) *
(float)(1.0 / 0x40000000);
val = val * 435898247 + 382842987;
}
*vp = val;
return (w+4);
}
static void noise_dsp(t_noise *x, t_signal **sp)
{
dsp_add(noise_perform, 3, sp[0]->s_vec, &x->x_val, sp[0]->s_n);
}
static void noise_setup(void)
{
noise_class = class_new(gensym("noise~"), (t_newmethod)noise_new, 0,
sizeof(t_noise), 0, 0);
class_addmethod(noise_class, (t_method)noise_dsp, gensym("dsp"), 0);
}
/* ----------------------- global setup routine ---------------- */
void d_osc_setup(void)
{
phasor_setup();
cos_setup();
osc_setup();
sigvcf_setup();
noise_setup();
}