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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iem_spec2 written by Thomas Musil (c) IEM KUG Graz Austria 2002 - 2006 */
#include "m_pd.h"
#include "iemlib.h"
/* -- spec2_stretch~ - stretch spectral bins --- */
typedef struct spec2_stretch_tilde
{
t_object x_obj;
int x_blocksize;
t_float x_mul;
t_float *x_spec;
t_float x_msi;
} t_spec2_stretch_tilde;
t_class *spec2_stretch_tilde_class;
static t_int *spec2_stretch_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_spec2_stretch_tilde *x = (t_spec2_stretch_tilde *)(w[3]);
int i, j, m, n = (t_int)(w[4])+1;
t_float yn0, yn1, fract;
t_float *spec=x->x_spec;
t_float mul=x->x_mul;
t_float rcp_mul = 1.0f / mul;
for(i=0; i<n; i++)/* copy spec into buffer */
spec[i] = in[i];
m = (int)((t_float)n * mul);
if(m > n)
m = n;
for(i=0; i<m; i++)/* stretch spec-buffer */
{
fract = (t_float)i * rcp_mul;
j = (int)fract;
fract -= (t_float)j;
yn0 = spec[j];
yn1 = spec[j+1];
out[i] = (yn1 - yn0)*fract + yn0;
}
for(i=m; i<n; i++)/* clear residal of spec-buffer */
out[i] = 0.0f;
return(w+5);
}
static void spec2_stretch_tilde_mul(t_spec2_stretch_tilde *x, t_floatarg mul)
{
if(mul <= 0.0f)
mul = 1.0f;
x->x_mul = mul;
}
static void spec2_stretch_tilde_dsp(t_spec2_stretch_tilde *x, t_signal **sp)
{
int n = (sp[0]->s_n)/2;
if(!x->x_blocksize)
{
x->x_spec = (t_float *)getbytes((n+1)*sizeof(t_float));
x->x_blocksize = n;
}
else if(x->x_blocksize != n)
{
x->x_spec = (t_float *)resizebytes(x->x_spec, (x->x_blocksize+1)*sizeof(t_float), (n+1)*sizeof(t_float));
x->x_blocksize = n;
}
dsp_add(spec2_stretch_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
}
static void *spec2_stretch_tilde_new(t_floatarg mul)
{
t_spec2_stretch_tilde *x = (t_spec2_stretch_tilde *)pd_new(spec2_stretch_tilde_class);
outlet_new(&x->x_obj, &s_signal);
if(mul <= 0.0f)
mul = 1.0f;
x->x_blocksize = 0;
x->x_mul = mul;
x->x_spec = (t_float *)0;
return (x);
}
static void spec2_stretch_tilde_free(t_spec2_stretch_tilde *x)
{
if(x->x_spec)
freebytes(x->x_spec, (x->x_blocksize+1) * sizeof(t_float));
}
void spec2_stretch_tilde_setup(void)
{
spec2_stretch_tilde_class = class_new(gensym("spec2_stretch~"), (t_newmethod)spec2_stretch_tilde_new,
0, sizeof(t_spec2_stretch_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(spec2_stretch_tilde_class, t_spec2_stretch_tilde, x_msi);
class_addmethod(spec2_stretch_tilde_class, (t_method)spec2_stretch_tilde_dsp, gensym("dsp"), 0);
class_addfloat(spec2_stretch_tilde_class, (t_method)spec2_stretch_tilde_mul);
class_sethelpsymbol(spec2_stretch_tilde_class, gensym("iemhelp/spec2_stretch~-help"));
}
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