Check that the input addresses are different from the output ones - usually in a case like that Pd will re-use the memory from the inputs for the outputs, so your object needs to be able to operate in-place.
(hint: allocate a bunch of temporary signals on teh stack using alloca(), and put the outputs in them irst; then when you're through using the intputs for anything, you can copy the temporary outputs to the real ones.)
cheers Miller
On Thu, Feb 22, 2018 at 02:38:24PM -0300, Alexandre Torres Porres wrote:
Hi folks, I need help on an external. I wanna perform a task on an array of signal inputs. It's a multichannel object, and I define the number of channels with an argument.
Here's just the core of it, as an object named "mtx~", where I map the input to the output. And this is what happens.
[image: Imagem inline 1]
So you see I get a weird mirrored output, instead of something like "1 2 3 4 5 6".
The perform method in the code is just
static t_int *mtx_perform(t_int *w){
t_mtx *x = (t_mtx *)(w[1]); int nblock = (int)(w[2]); t_float **in_vectors = x->x_in_vectors; t_float **out_vectors = x->x_out_vectors; t_int i; for(i = 0; i < x->x_ch; i++){ t_float *in = in_vectors[i]; t_float *out = out_vectors[i]; t_int n = nblock; while(n--) *out++ = *in++; } return (w + 3);}
What am I doing wrong? How should this go? See attached the help test example and code.
Thanks
#include "m_pd.h"
typedef struct _mtx{ t_object x_obj; t_int x_ch; t_float **x_in_vectors; t_float **x_out_vectors; }t_mtx;
static t_class *mtx_class;
static t_int *mtx_perform(t_int *w){ t_mtx *x = (t_mtx *)(w[1]); int nblock = (int)(w[2]); t_float **in_vectors = x->x_in_vectors; t_float **out_vectors = x->x_out_vectors; t_int i; for(i = 0; i < x->x_ch; i++){ t_float *in = in_vectors[i]; t_float *out = out_vectors[i]; t_int n = nblock; while(n--) *out++ = *in++; } return (w + 3); }
static void mtx_dsp(t_mtx *x, t_signal **sp){ t_int i, nblock = sp[0]->s_n; t_signal **sigp = sp; t_float **vecp = x->x_in_vectors; for(i = 0; i < x->x_ch; i++) *vecp++ = (*sigp++)->s_vec; // input vectors vecp = x->x_out_vectors; for(i = 0; i < x->x_ch; i++) *vecp++ = (*sigp++)->s_vec; // output vectors dsp_add(mtx_perform, 2, x, nblock); }
static void *mtx_free(t_mtx *x){ freebytes(x->x_in_vectors, x->x_ch * sizeof(*x->x_in_vectors)); freebytes(x->x_out_vectors, x->x_ch * sizeof(*x->x_out_vectors)); return(void *)x; }
static void *mtx_new(t_floatarg f){ t_mtx *x = (t_mtx *)pd_new(mtx_class); x->x_ch = (int)f < 1 ? 1 : (int)f > 64 ? 64 : (int)f; x->x_in_vectors = getbytes(x->x_ch * sizeof(*x->x_in_vectors)); x->x_out_vectors = getbytes(x->x_ch * sizeof(*x->x_out_vectors)); t_int i; for(i = 0; i < x->x_ch; i++) inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal); for(i = 0; i < x->x_ch; i++) outlet_new(&x->x_obj, gensym("signal")); return(x); }
void mtx_tilde_setup(void){ mtx_class = class_new(gensym("mtx~"), (t_newmethod)mtx_new, (t_method)mtx_free, sizeof(t_mtx), CLASS_NOINLET, A_DEFFLOAT, 0); class_addmethod(mtx_class, (t_method)mtx_dsp, gensym("dsp"), A_CANT, 0); }
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