/* This code is placed in the public domain. */ #include <stdlib.h>#include <math.h>#include "soundpipe.h" int sp_tenvx_create(sp_tenvx **p){ *p = malloc(sizeof(sp_tenvx)); return SP_OK;} int sp_tenvx_destroy(sp_tenvx **p){ free(*p); return SP_OK;} int sp_tenvx_init(sp_data *sp, sp_tenvx *p){ p->hold = 0.5; p->atk = 0.5; p->rel = 0.5; p->a_a = p->b_a = 0; p->a_r = p->b_r = 0; p->y = 0; p->count = (uint32_t) (p->hold * sp->sr); return SP_OK;} int sp_tenvx_compute(sp_data *sp, sp_tenvx *p, SPFLOAT *in, SPFLOAT *out){ *out = 0; if(*in != 0) { p->a_a = exp(-1.0/(p->atk * sp->sr)); p->b_a = 1.0 - p->a_a; p->a_r = exp(-1.0/(p->rel * sp->sr)); p->b_r = 1.0 - p->a_r; p->count = (uint32_t) (p->hold * sp->sr); } if(p->count > 0) { *out = p->b_a + p->a_a * p->y; p->y = *out; p->count--; } else { *out = p->a_r * p->y; p->y = *out; } return SP_OK;}
/* This code is placed in the public domain. */
#include <stdlib.h>
#include <math.h>
#include "soundpipe.h"
int sp_tenvx_create(sp_tenvx **p)
{
*p = malloc(sizeof(sp_tenvx));
return SP_OK;
}
int sp_tenvx_destroy(sp_tenvx **p)
{
free(*p);
return SP_OK;
}
int sp_tenvx_init(sp_data *sp, sp_tenvx *p)
{
p->hold = 0.5;
p->atk = 0.5;
p->rel = 0.5;
p->a_a = p->b_a = 0;
p->a_r = p->b_r = 0;
p->y = 0;
p->count = (uint32_t) (p->hold * sp->sr);
return SP_OK;
}
int sp_tenvx_compute(sp_data *sp, sp_tenvx *p, SPFLOAT *in, SPFLOAT *out)
{
*out = 0;
if(*in != 0) {
p->a_a = exp(-1.0/(p->atk * sp->sr));
p->b_a = 1.0 - p->a_a;
p->a_r = exp(-1.0/(p->rel * sp->sr));
p->b_r = 1.0 - p->a_r;
p->count = (uint32_t) (p->hold * sp->sr);
}
if(p->count > 0) {
*out = p->b_a + p->a_a * p->y;
p->y = *out;
p->count--;
} else {
*out = p->a_r * p->y;
p->y = *out;
}
return SP_OK;
}