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#include "m_pd.h"
//Create one input for each channel
static t_class *crossfade_tilde_class;
typedef struct _crossfade_tilde {
t_object x_obj;
t_float mix; //The mix value (0: input 1, 1:input2)
int n_in;
int channels;
t_sample **in;
int n_out;
t_sample **out;
t_sample f;
t_sample* buffer; //Input frame buffer: one sample of every input
} t_crossfade_tilde;
// Perform
static t_int *crossfade_tilde_perform(t_int *w)
{
t_crossfade_tilde *x = (t_crossfade_tilde *)(w[1]);
int n = (int)(w[2]);
if (x->mix < 0) x->mix = 0;
if (x->mix > 1) x->mix = 1;
t_float inv_mix = 1-x->mix;
int i;
int j;
t_sample* out;
for ( j =0; j < n; j++) {
// Copy one sample of all the inputs
for ( i=0; i < x->n_in;i++ ) {
x->buffer[i] = (t_sample) x->in[i][j];
}
for ( i=0; i < x->channels;i++ ) {
out = (t_sample *)(x->out[i]);
out[j] = (x->buffer[i] * inv_mix) + (x->buffer[i+x->channels] * x->mix) ;
}
}
return (w+3);
}
// Annouce signal inputs and outputs to the DSP chain
static void crossfade_tilde_dsp(t_crossfade_tilde *x, t_signal **sp)
{
int n;
t_sample **dummy=x->in;
for(n=0;n<x->n_in;n++)*dummy++=sp[n]->s_vec;
dummy=x->out;
for(n=0;n<x->n_out;n++)*dummy++=sp[n+x->n_in]->s_vec;
dsp_add(crossfade_tilde_perform, 2, x, sp[0]->s_n);
}
static void crossfade_tilde_free( t_crossfade_tilde *x) {
freebytes(x->in, x->n_in * sizeof(t_sample *));
freebytes(x->out, x->n_out * sizeof(t_sample *));
freebytes(x->buffer,x->n_in * sizeof( * x->buffer));
}
static void *crossfade_tilde_new(t_floatarg f)
{
t_crossfade_tilde *x = (t_crossfade_tilde *)pd_new(crossfade_tilde_class);
x->channels = (int) f;
if ( x->channels < 1 ) x->channels = 2;
x->n_in = x->channels * 2;
x->in = (t_sample **)getbytes(x->n_in * sizeof(t_sample *));
int i=x->n_in;
while(i--)x->in[i]=0;
x->n_out = x->channels;
x->out = (t_sample **)getbytes(x->n_in * sizeof(t_sample *));
i=x->n_out;
while(i--)x->out[i]=0;
x->buffer = getbytes(x->n_in * sizeof( * x->buffer));
for (i=0; i < x->n_in - 1; i++) {
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
}
for (i=0; i < x->n_out; i++) {
outlet_new(&x->x_obj, &s_signal);
}
floatinlet_new (&x->x_obj, &x->mix);
return (void *)x;
}
void crossfade_tilde_setup(void) {
crossfade_tilde_class = class_new(gensym("crossfade~"),
(t_newmethod)crossfade_tilde_new,
(t_method)crossfade_tilde_free, sizeof(t_crossfade_tilde),
0, A_DEFFLOAT, 0);
class_addmethod(crossfade_tilde_class,
(t_method)crossfade_tilde_dsp, gensym("dsp"), 0);
// class_addmethod(crossfade_tilde_class, nullfn, gensym("signal"), 0);
CLASS_MAINSIGNALIN(crossfade_tilde_class, t_crossfade_tilde, f);
}
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