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path: root/src/iem_t3_lib/sigt3_sig.c
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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_t3_lib written by Thomas Musil, Copyright (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 <math.h>
#include <stdio.h>
#include <string.h>

/* -------------------------- sigt3_sig~ ------------------------------ */
static t_class *sigt3_sig_class;

typedef struct _sigt3_sig
{
    t_object x_obj;
    t_clock  *x_clock;
    float    x_old_val;
    float    x_new_val;
    float    *x_beg;
    int      x_n;
    int      x_t3_bang_samps;
    int      x_transient;
    float    x_ms2samps;
    float    x_ticks2ms;
} t_sigt3_sig;

static void sigt3_sig_tick(t_sigt3_sig *x)
{
    float *trans = x->x_beg, val;
    int n = x->x_n, t3_bang_samps, i;

    t3_bang_samps = x->x_t3_bang_samps;
    if(!x->x_transient)
    {
	val = x->x_old_val;
	for(i=0; i<t3_bang_samps; i++)
	    trans[i] = val;
	x->x_transient = 1;
    }
    val = x->x_old_val = x->x_new_val;
    for(i=t3_bang_samps; i<n; i++)
	trans[i] = val;
}

static void sigt3_sig_stop(t_sigt3_sig *x)
{
    clock_unset(x->x_clock);
    x->x_new_val = x->x_old_val;
}

static void sigt3_sig_list(t_sigt3_sig *x, t_symbol *s, int ac, t_atom *av)
{
    if((ac == 2)&&IS_A_FLOAT(av,0)&&IS_A_FLOAT(av,1))
    {
	int n = x->x_n, t3_bang_samps, ticks;

	t3_bang_samps = (int)((float)atom_getfloatarg(0, ac, av)*x->x_ms2samps);
        x->x_new_val = (float)atom_getfloatarg(1, ac, av);
	if(t3_bang_samps < 0)
	    t3_bang_samps = 0;
	ticks = t3_bang_samps / n;
	x->x_t3_bang_samps = t3_bang_samps - n*ticks;
	if(ticks < 1)
	    sigt3_sig_tick(x);
	else
	    clock_delay(x->x_clock, (double)ticks * (double)x->x_ticks2ms);
    }
}

static t_int *sigt3_sig_perform(t_int *w)
{
    t_float *out = (t_float *)(w[1]);
    t_sigt3_sig *x = (t_sigt3_sig *)(w[2]);
    int n = (int)(w[3]);

    if(x->x_transient)
    {
	float *trans = x->x_beg;

        while(n--)
	    *out++ = *trans++;
        x->x_transient = 0;
    }
    else
    {
	float val = x->x_new_val;

        while(n--)
	    *out++ = val;
    }
    return (w+4);
}

static t_int *sigt3_sig_perf8(t_int *w)
{
    t_float *out = (t_float *)(w[1]);
    t_sigt3_sig *x = (t_sigt3_sig *)(w[2]);
    int n = (int)(w[3]), i;

    if(x->x_transient)
    {
	float *trans = x->x_beg;

	for(i=0; i<n; i+=8, out+=8, trans+=8)
	{
	    out[0] = trans[0];
	    out[1] = trans[1];
	    out[2] = trans[2];
	    out[3] = trans[3];
	    out[4] = trans[4];
	    out[5] = trans[5];
	    out[6] = trans[6];
	    out[7] = trans[7];
	}
	x->x_transient = 0;
    }
    else
    {
	float val = x->x_new_val;

        for(i=0; i<n; i+=8, out+=8)
	{
	    out[0] = val;
	    out[1] = val;
	    out[2] = val;
	    out[3] = val;
	    out[4] = val;
	    out[5] = val;
	    out[6] = val;
	    out[7] = val;
	}
    }
    return (w+4);
}

static void sigt3_sig_dsp(t_sigt3_sig *x, t_signal **sp)
{
    int i;
    float *trans, val;

    if(sp[0]->s_n > x->x_n)
    {
	freebytes(x->x_beg, x->x_n*sizeof(float));
	x->x_n = sp[0]->s_n;
	x->x_beg = (float *)getbytes(x->x_n*sizeof(float));
    }
    else
	x->x_n = sp[0]->s_n;
    x->x_ms2samps = 0.001*(float)sp[0]->s_sr;
    x->x_ticks2ms = (float)x->x_n / x->x_ms2samps;
    i = x->x_n;
    val = x->x_new_val;
    trans = x->x_beg;
    while(i--)
	*trans++ = val;
    
    if((sp[0]->s_n)&7)
	dsp_add(sigt3_sig_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
    else
	dsp_add(sigt3_sig_perf8, 3, sp[0]->s_vec, x, sp[0]->s_n);
}

static void sigt3_sig_free(t_sigt3_sig *x)
{
    if(x->x_beg)
	freebytes(x->x_beg, x->x_n*sizeof(float));
    clock_free(x->x_clock);
}

static void *sigt3_sig_new(t_floatarg init_val)
{
    t_sigt3_sig *x = (t_sigt3_sig *)pd_new(sigt3_sig_class);

    x->x_new_val = x->x_old_val = init_val;
    x->x_n = (int)sys_getblksize();
    x->x_beg = (float *)getbytes(x->x_n*sizeof(float));
    x->x_t3_bang_samps = x->x_transient = 0;
    x->x_ms2samps = 0.001 * (float)sys_getsr();
    x->x_ticks2ms = (float)x->x_n / x->x_ms2samps;
    x->x_clock = clock_new(x, (t_method)sigt3_sig_tick);
    outlet_new(&x->x_obj, &s_signal);
    return (x);
}

void sigt3_sig_setup(void)
{
    sigt3_sig_class = class_new(gensym("t3_sig~"), (t_newmethod)sigt3_sig_new,
				(t_method)sigt3_sig_free, sizeof(t_sigt3_sig), 0, A_DEFFLOAT, 0);
    class_addmethod(sigt3_sig_class, (t_method)sigt3_sig_dsp, gensym("dsp"), 0);
    class_addmethod(sigt3_sig_class, (t_method)sigt3_sig_stop, gensym("stop"), 0);
    class_addlist(sigt3_sig_class, (t_method)sigt3_sig_list);
    class_sethelpsymbol(sigt3_sig_class, gensym("iemhelp/help-t3_sig~"));
}