Hi Ratnesh,
what type is d_Shfilter?
Best regards,
Marcus
On 09.09.2015 20:43, ratnesh kumbhkar wrote:
> Hi all,
> I am trying to make an out-of-tree module using sync block. In which I
> want to make a local filter, i.e. output of this filter is not
> connected to an output port, but to be stored in a local variable.
>
> int ShortPNcorr_impl::work(int noutput_items,
> gr_vector_const_void_star &input_items,
> gr_vector_void_star &output_items)
> {
> const gr_complex *in = (const gr_complex *)
> input_items[0];
> gr_complex *out = (gr_complex *) output_items[0];
> gr_complex *tcorr = (gr_complex *) output_items[1];
> int *flag = (int *) output_items[2]; // this is
> calculated based on local filter
>
> std::vector<gr_complex>
> short_corr(noutput_items+history());
> gr_complex *corr = (gr_complex *) &(short_corr[0]);
>
> ......................
>
>
> d_Shfilter->filter(noutput_items+*X*, in, corr);
> // Where X>0
> // d_Shfilter is *fft_filter_ccc* filter of length 40
> (number of taps)
> // Since I am saving a history of length 320, I am
> assuming that input buffer has atleast noutput_items+319 values available
>
> ......................
> }
>
> I think that filter requires *corr* to be a pointer to the vector
> (similar to 'in' or 'out'), and that is what I am trying to do. But
> this results in an unstable operation and whenever I choose X>250, I
> get "double free or corruption" error. Can someone explain this? Is my
> understanding of "history" wrong?
>
> Thanks
>
> Ratnesh
> ᐧ
>
>
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