[PD] Help with writing externals

[thewade]

Thanks Mathieu!

I ran pd inside of gdb and figured out that my problem is in my dsp function, which only calls the dsp_add function.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1073855264 (LWP 1420)]
0x414b197b in fftbin_tilde_dsp () from /home/wade/pd/general/fftbin~.pd_linux

So that just leaves me with the problem of figuring out the syntax of dsp_add.

Heres how I thought it worked.

This call...
void fftbin_tilde_dsp(t_fftbin *ref, t_signal **sp)
{
  dsp_add(fftbin_tilde_perform, 3, ref,
          sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
}
...corresponds to this t_int *w.
t_int *fftbin_tilde_perform(t_int *w)
{
  t_fftbin  *ref = (t_fftbin *)(w[1]);         //data structure
  t_sample  *in1 = (t_sample *)(w[2]);         //1st signal/bang inlet
  int        in2 = (int)(w[3]);                //2nd float inlet
  t_sample  *out = (t_float *)(w[4]);          //float outlet
  int        n   = (int)(w[5]);                //number of samples in block

Is this correct?
Well, obviously not, but wheres the error?

Thanks for the help!
-thewade