/usr/share/puredata/doc/6.externs/dspobj~.c is in puredata-doc 0.46.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | #include "m_pd.h"
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* ------------------------ dspobj~ ----------------------------- */
/* tilde object to take absolute value. */
static t_class *dspobj_class;
typedef struct _dspobj
{
t_object x_obj; /* obligatory header */
t_float x_f; /* place to hold inlet's value if it's set by message */
} t_dspobj;
/* this is the actual performance routine which acts on the samples.
It's called with a single pointer "w" which is our location in the
DSP call list. We return a new "w" which will point to the next item
after us. Meanwhile, w[0] is just a pointer to dsp-perform itself
(no use to us), w[1] and w[2] are the input and output vector locations,
and w[3] is the number of points to calculate. */
static t_int *dspobj_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
while (n--)
{
float f = *(in++);
*out++ = (f > 0 ? f : -f);
}
return (w+4);
}
/* called to start DSP. Here we call Pd back to add our perform
routine to a linear callback list which Pd in turn calls to grind
out the samples. */
static void dspobj_dsp(t_dspobj *x, t_signal **sp)
{
dsp_add(dspobj_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void *dspobj_new(void)
{
t_dspobj *x = (t_dspobj *)pd_new(dspobj_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
/* this routine, which must have exactly this name (with the "~" replaced
by "_tilde) is called when the code is first loaded, and tells Pd how
to build the "class". */
void dspobj_tilde_setup(void)
{
dspobj_class = class_new(gensym("dspobj~"), (t_newmethod)dspobj_new, 0,
sizeof(t_dspobj), 0, A_DEFFLOAT, 0);
/* this is magic to declare that the leftmost, "main" inlet
takes signals; other signal inlets are done differently... */
CLASS_MAINSIGNALIN(dspobj_class, t_dspobj, x_f);
/* here we tell Pd about the "dsp" method, which is called back
when DSP is turned on. */
class_addmethod(dspobj_class, (t_method)dspobj_dsp, gensym("dsp"), 0);
}
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