[PD-dev] inlets sending to wrong outlets

[Christof Ressi]

In Pd, signal inlets and outlets can share the same buffer. Therefore it 
is important that for any given sample index you never write to any 
outlet before reading from all inlets.

In your case, you have to first make a copy of all input signals before 
passing them through to the outlets. You can allocate the necessary 
intermediate buffers in the dsp() method.

> I've been working with variable amounts of inlets and outlets
What do you mean by "variable" inlets/outlets? Do you mean that the 
number of inlets/outlets is determined by creation arguments? In that 
case, this is not related to the problem at ahdn. Buffer aliasing can 
happen either way. (It actually depends on how the surrounding objects 
are connected.)

Christof

On 31.05.2020 21:12, Eric Lennartson wrote:
> I've been looking at the code for those, but I'm finding it a little 
> hard to parse.
> Not sure how this is going to look on your end, but sorry for the text 
> wall. If there's a better way to share lmk.
>
> typedefstruct_viotest
>
> {
>
> t_object x_obj;
>
> int n_outs, n_ins, n_iolets;
>
> t_sample**in_vec, **out_vec; // vector to hold all the inlets and outlets
>
> } t_viotest_tilde;
>
>
> staticvoidviotest_tilde_input(t_viotest_tilde*x, t_floatargf)
>
> {
>
> error("[viotest~]: no method for float.");
>
> }
>
>
> statict_int*viotest_tilde_perform(t_int*w)
>
> {
>
> t_viotest_tilde*x = (t_viotest_tilde*)(w[1]);
>
> int nblock = (int)(w[2]);
>
> int n = nblock;
>
> t_sample **in_vec = x->in_vec;
>
> t_sample **out_vec = x->out_vec;
>
> int smaller = (x->n_ins < x-> n_outs) ? x->n_ins : x->n_outs;
>
> for(int channel = 0; channel < smaller; ++channel)
>
>   {
>
> t_sample* in = in_vec[channel];
>
> t_sample* out = out_vec[channel];
>
>       n = nblock;
>
> while(n--)
>
>       {
>
> t_sample out_val = *in++;
>
>           *out++ = out_val;
>
>       }
>
>   }
>
>
> return (w + 3);
>
> }
>
>
> staticvoidviotest_tilde_dsp(t_viotest_tilde*x, t_signal**sp)
>
> {
>
> int i, nblock = sp[0]->s_n;
>
> t_sample **dummy = x->in_vec;
>
> for(i = 0; i < x->n_ins; ++i)
>
>   {
>
>       *dummy++ = sp[i]->s_vec;
>
>   }
>
> for(; i < x->n_iolets; ++i)
>
>   {
>
>       *dummy++ = sp[i]->s_vec;
>
>   }
>
> dsp_add(viotest_tilde_perform, 2, x, nblock);
>
> }
>
>
> On Sun, May 31, 2020 at 12:05 PM Alexandre Torres Porres 
> <porres at gmail.com <mailto:porres at gmail.com>> wrote:
>
>     I remember I went through similar stuff, see the code of else/mtx~
>     and cyclone/matrix~
>
>     and, share your code?
>
>     cheers
>
>     Em dom., 31 de mai. de 2020 às 16:00, Eric Lennartson
>     <lennartsoneric at gmail.com <mailto:lennartsoneric at gmail.com>> escreveu:
>
>         Hey all,
>
>         I've been working with variable amounts of inlets and outlets
>         and for the most part it's been working fine. If it's only
>         variable inlets and the outlets are fixed, or vice versa, it
>         works fine. However when both are variable I can't seem to get
>         the inlets to go to the correct outlet. My current code is
>         cycling through the inlets and outlets in pairs, but for some
>         reason this isn't working. Any thoughts?
>
>         Thanks
>         Eric
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