Re: [Discuss-gnuradio] Layer Mapper in GnuRadio

[Josh Blum]

> In The General Work Function I wanted to create 4 outputs this way:
> 
> int
>     Layer_Mapper_Transmit_Diversity_cc_impl::general_work (int
> noutput_items,
>                        gr_vector_int &ninput_items,
>                        gr_vector_const_void_star &input_items,
>                        gr_vector_void_star &output_items)
>     {
>         const float **in = (const float **) input_items[0];
>         float **out0 = (float **) output_items[0];
>         float **out1 = (float **) output_items[1];
>         float **out2 = (float **) output_items[2];
>         float **out3 = (float **) output_items[3];
> 
> Because the inputs and outputs are arrays so I declared them as matrices ,
> does GnuRadio accept this ?
> 
> 

So input_items[0] or output_items[1] for example, is a pointer to a
linear chunk of memory. Casting it to a float ** might imply that its an
array of pointers which each point to a linear row/column of a matrix.
But that isnt the case, so things will likely segfault.

You could cast the pointer to a C matrix with the double brackets and
the fixed widths like a [64][4] for example, I think C will map those
double bracketed access nicely to a linear chunk of memory.

I hope that helps!
-josh

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