OOT module output vector with different length from input vector itemsize mismatch

[Grace Yeung]

    Hi,
    
    I have an OOT module that takes in vectors of length A and outputs
    vectors of length C using the following:
    
    Constructor:
    
    my_module_impl::my_module_impl (int A, int C, ...)
        : gr::sync_block("my_module",
                         gr::io_signature::make(1, 1,
    A*sizeof(gr_complex)),
                         gr::io_signature::make(1, 1,
    C*sizeof(gr_complex)))
        
    
    Work function:
    
        int my_module_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];
          int i;
          
          for (i = 0; i < noutput_items; i++) {
    
               ...
            
            memcpy(out, my_output, C*sizeof(gr_complex));  
            in += A;
            out += C;
          }
          
          return(noutput_items);
    ...
    
    At run time, I get a
    
    ValueError:
          itemsize mismatch: my_module0:0 using 524264,
          vector_to_stream0:0 using 294912
      
    where the first number 524264 is not what I am expecting it
    to be which should be the same as the second number. Specifically,
    A=65536 (524264=8*(A-3)) and C=36864 (294912=8C).
    
    Am I doing everything correctly? Thanks!
    
    Grace
    
-- 
Grace K. Yeung, MS
NorthWest Research Associates
301 Webster Street
Monterey, CA 93940
grace@nwra.com
https://www.nwra.com

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