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/* -*- c++ -*- */
/*
* Copyright 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sub_ff_impl.h>
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
namespace gr {
namespace blocks {
sub_ff::sptr
sub_ff::make(size_t vlen)
{
return gnuradio::get_initial_sptr
(new sub_ff_impl(vlen));
}
sub_ff_impl::sub_ff_impl(size_t vlen)
: sync_block("@sub_ff",
io_signature::make(1, -1, sizeof(float)*vlen),
io_signature::make(1, 1, sizeof(float)*vlen)),
d_vlen(vlen)
{
const int alignment_multiple =
volk_get_alignment() / sizeof(float);
set_alignment(std::max(1, alignment_multiple));
}
int
sub_ff_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
float *out = (float*)output_items[0];
int ninputs = input_items.size();
int noi = noutput_items*d_vlen;
//for(size_t i = 0; i < noutput_items*d_vlen; i++){
// @I_TYPE@ acc = ((@I_TYPE@ *) input_items[0])[i];
// for (int j = 1; j < ninputs; j++)
// acc -= ((@I_TYPE@ *) input_items[j])[i];
//
// *optr++ = (@O_TYPE@) acc;
//}
const float *in = (const float*)input_items[0];
memcpy(out, in, noi*sizeof(float));
for(int i = 1; i < ninputs; i++) {
in = (const float*)input_items[i];
volk_32f_x2_subtract_32f(out, out, in, noi);
}
return noutput_items;
}
} /* namespace blocks */
} /* namespace gr */
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