Pd-dev September 2023

pd-dev@lists.iem.at

6 participants
7 discussions

Object crashes when trying to write to its outlet
by Alexandros Drymonitis 10 Oct '23

10 Oct '23

I'm trying to code an object with a variable number of inlets and outlets, that's more complex than the one I posted a few days ago. Writing to its input works fine, but when I try to write to its output, Pd crashes. The culprit is when I try to access each individual output. In the new routine, I allocate memory likes this: ``` x->x_in = (t_sample **)getbytes(ninlets * sizeof(t_sample *)); x->x_out = (t_sample **)getbytes(noutlets * sizeof(t_sample *)); for (i = 0; i < ninlets; i++) x->x_in[i] = (t_sample *)getbytes(x->x_blksize * sizeof(t_sample)); for (i = 0; i < noutlets; i++) x->x_out[i] = (t_sample *)getbytes(x->x_blksize * sizeof(t_sample)); ``` But Pd crashes when I try to access any output other that x->x_out[0][0]. In a function that is called by the perform routine, I do the following: ``` for (i = 0; i < x->x_noutlets; i++) { x->x_out[i][x->x_sample_index] = (t_sample)x->x_outvec[i]; } ``` and Pd crashes. Debugging with gdb pointed to this line. Changing the code to x->x_out[0][0] does not crash Pd. I have also confirmed that x->x_outvec[i] is not crashing Pd. Since memory for x->x_out has been allocated, and since I'm not trying to access an element beyond this allocated memory (which is also confirmed), why does Pd crash? Or am I doing something wrong in the memory allocation part?

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how to output list with selector
by Alexandros Drymonitis 21 Sep '23

21 Sep '23

I'm trying to output a list of values with a selector. For example, "foo 1 2". I though of creating a vector of t_atom, where a_type of the first element would be A_SYMBOL, and the other two would be A_FLOAT, and after a list outlet is created in the new method like this: `x->outlist = outlet_new(x->x_obj, &s_list);` I can output the list with a bang like this: `outlet_list(x->outlist, &s_list, 3, x->outlist)`; But Pd complains with this error: ``` print: listconsistency check failed: atom_string consistency check failed: atom_string consistency check failed: atom_string ``` What I would like, is to get the output of the object and route it with [route foo]. How do I go about this?

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external crashing when block size changes
by Alexandros Drymonitis 20 Sep '23

20 Sep '23

I'm trying to create a signal external with a variable number of inlets and outlets. As a test, I have written an object that copies its input to the respective output. When I put the object in a subpatch and use [block~] to change the block size, it crashes. Loading Pd with gdb gives the following output, which to me doesn't seem very helpful: ``` Program received signal SIGSEGV, Segmentation fault. 0x0000000000000000 in ?? () ``` Here's the code of the object (the var_io_tilde_process function is there as a test to see if I can process the output in a routine other than the perform one): ``` #include <m_pd.h> static t_class *var_io_tilde_class; typedef struct _var_io_tilde { t_object obj; t_sample f; t_sample **in; t_sample **out; t_sample *buf; int chnls; int blksize; int bufbytes; } t_var_io_tilde; static void var_io_tilde_process(t_var_io_tilde *x, int n) { int i, j; t_sample **out = x->out; t_sample *buf = x->buf; for (i = 0; i < x->chnls; i++) { for (j = 0; j < n; j++) { out[i][j] = buf[i*n+j]; } } } t_int *var_io_tilde_perform(t_int *w) { int i, j, n; t_var_io_tilde *x = (t_var_io_tilde *)(w[1]); n = (int)(w[2]); t_sample **in = x->in; //t_sample **out = x->out; t_sample *buf = x->buf; for (i = 0; i < x->chnls; i++) { for (j = 0; j < n; j++) { buf[i*n+j] = in[i][j]; } } var_io_tilde_process(x, n); return (w+3); } void var_io_tilde_dsp(t_var_io_tilde *x, t_signal **sp) { int i; int bufbytes = x->bufbytes; t_sample **dummy = x->in; for (i=0; i<x->chnls; i++) *dummy++ = sp[i]->s_vec; dummy = x->out; for (i=x->chnls; i<x->chnls*2; i++) *dummy++ = sp[i]->s_vec; if (x->blksize != sp[0]->s_n) { x->blksize = sp[0]->s_n; x->bufbytes = x->chnls*2*sp[0]->s_n; x->buf = (t_sample *)resizebytes((void *)x->buf, bufbytes, x->bufbytes); if (x->buf == NULL) { pd_error(x, "cannot realloc %d bytes of memory", x->bufbytes); return; } } dsp_add(var_io_tilde_perform, 2, x, sp[0]->s_n); } void *var_io_tilde_new(t_floatarg f) { int i; t_var_io_tilde *x = (t_var_io_tilde *)pd_new(var_io_tilde_class); x->chnls = (f) ? f : 2; x->blksize = sys_getblksize(); /* create signal inlets (first is done in var_io_tilde_setup) */ for (i=1; i<x->chnls; i++) inlet_new(&x->obj, &x->obj.ob_pd, &s_signal, &s_signal); /* create signal outlets */ for (i=0; i<x->chnls; i++) outlet_new(&x->obj, &s_signal); x->in = (t_sample **)getbytes(x->chnls * sizeof(t_sample **)); x->out = (t_sample **)getbytes(x->chnls * sizeof(t_sample **)); for (i=0; i<x->chnls; i++) x->in[i] = x->out[i] = 0; x->bufbytes = x->chnls*2*x->blksize; x->buf = (t_sample *)getbytes(x->bufbytes * sizeof(t_sample *)); return (void *)x; } void var_io_tilde_free(t_var_io_tilde *x) { freebytes(x->in, sizeof(x->in)); freebytes(x->out, sizeof(x->out)); } void var_io_tilde_setup(void) { var_io_tilde_class = class_new(gensym("var_io~"), (t_newmethod)var_io_tilde_new, (t_method)var_io_tilde_free, sizeof(t_var_io_tilde), CLASS_DEFAULT, A_DEFFLOAT, 0); class_addmethod(var_io_tilde_class, (t_method)var_io_tilde_dsp, gensym("dsp"), 0); CLASS_MAINSIGNALIN(var_io_tilde_class, t_var_io_tilde, f); } ``` What am I doing wrong? And, if this is not the way, how can I create an object with a variable number of inlets and outlets (preferably independent of one another).

3 4

How to check data type of arguments in object
by Alexandros Drymonitis 13 Sep '23

13 Sep '23

I'd like to write an object that takes a variable number of arguments, which can be either float or symbol, and in any order (for example, float float symbol, or symbol float). How can I check the data type of each argument inside the new routine?

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Use Pd executable to debug an external
by Joseph Larralde 12 Sep '23

12 Sep '23

Hi list, I'm looking for advice about how to debug a Pd external using breakpoints etc (on macos big sur ATM). I'm actually experimenting avendish : https://github.com/celtera/avendish/ while working on a new object. I started from the suggested template : https://github.com/celtera/avendish-audio-processor-template/ I seem to have a segfault at some point with the Pd object but can't reach any breakpoint. So far I have tried using CLion, as the avendish template is CMake based, pointing at /Applications/Pd-<version>/Contents/Resources/bin/pd as the target executable for the debug session. This technique is working fine with Max/MSP but I can't reproduce the bug with the Max version of the object. With the Pd version I get messages in the system's console saying stuff like "error: MachTask::StartExceptionThread (): task invalid, exception thread start failed." and "Attach failed" when trying to start the debug session. Any ideas I could try ? Everything I'm able to see for now is : Process finished with exit code 139 (interrupted by signal 11: SIGSEGV) Thanks in advance, Joseph

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Re: [PD-dev] snake_in~ tutorial?
by Alexandros Drymonitis 11 Sep '23

11 Sep '23

Thanks, I got all the info I need. Now I'm running into this strange error, by using the following line in the setup function: ``` var_io_snake_tilde_class = class_new(gensym("var_io_snake~"), (t_newmethod)var_io_snake_tilde_new, (t_method)var_io_snake_tilde_free, sizeof(t_var_io_snake_tilde), CLASS_MULTICHANNEL, A_DEFFLOAT, 0); ``` The error is the following: ``` var_io_snake~.c:85:82: error: ‘CLASS_MULTICHANNEL’ undeclared (first use in this function) 85 | (t_method)var_io_snake_tilde_free, sizeof(t_var_io_snake_tilde), CLASS_MULTICHANNEL, A_DEFFLOAT, 0); ``` I'm #including m_pd.h (I mean, it's finding the rest of the Pd API stuff I'm using there), and CLASS_MULTICHANNEL is in that file, so why do I get this error? On 9/10/23 22:32, Alexandre Torres Porres wrote: > Em dom., 10 de set. de 2023 às 16:30, Alexandre Torres Porres > <porres(a)gmail.com> escreveu: > > check these objects, they perform simple tasks and maybe one of > them helps you with what you want... > > > oops, I meant to send this image here... > > > > >

2 4

snake_in~ tutorial?
by Alexandros Drymonitis 10 Sep '23

10 Sep '23

I want to experiment with the new Pd feature of the [snake_in~]/[snake_out~] objects, specifically with [snake_in~]. In Pd's source files (in d_misc.c) I read the following in [snake_in~]'s dsp routine: ``` static void snake_in_tilde_dsp(t_snake_in *x, t_signal **sp) { int i; /* create an n-channel output signal. sp has n+1 elements. */ signal_setmultiout(&sp[x->x_nchans], x->x_nchans); /* add n copy operations to the DSP chain, one from each input */ for (i = 0; i < x->x_nchans; i++) dsp_add_copy(sp[i]->s_vec, sp[x->x_nchans]->s_vec + i * sp[0]->s_length, sp[0]->s_length); } ``` There is no perform routine, so my question is, how do I deal with snake signals in a perform routine? How do I unpack them? Where is this happening in Pd's source code, so I can have a look?

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Pd-dev September 2023