Hi,
I wrote a custom block to compute beamforming weights. The block takes 8 inputs and 8 outputs.
It takes 64 samples from each input stream and produces 1 output in each output stream.I am not getting any output and GRC stops working when I set the decimation rate to 64.I tried printing noutput_items and it is like 64,32,16,8,4,2,1 and stops. But when I set the rate to 1 the block works but rather very slowly and overflows when UHD source is connected.The noutput_items is always 4096 or 4095 for this case. I am not sure if I am setting the correct decimation rate and returning correct number of samples.Can anyone help?
code snippet:
beamformer_cc_impl::beamformer_cc_impl(int nsamples)
: gr_sync_decimator("beamformerr_cc",
gr_make_io_signature(1, -1, sizeof (gr_complex)),
gr_make_io_signature(1, -1, sizeof (gr_complex)),nsamples),
d_samples(nsamples),
{
}
int
beamformer_cc_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
for (int i=0;i<ninputs;i++){
out[i] = (gr_complex *) output_items[i];
}
for (int k=0;k<noutput_items;k++){
for(unsigned int i=0;i<ninputs;i++){
memcpy(&in_buffer[i][0]),&((const gr_complex *)input_items[i])[k*d_samples],d_samples*sizeof(gr_complex));
}
//..signal processing on in_buffer to compute covariance matrix and pseudo inverse of covariance matrix of size 8x8....
for (int i=0;i<ninputs;i++){
memcpy(&out[i][k],&weights[i],sizeof(complex<float>));
}
}
return noutput_items;
}
Thanks,
Saran