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/* -*- c++ -*- */
/*
* Copyright 2012,2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "nlog10_ff_impl.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
#include <limits>
namespace gr {
namespace blocks {
nlog10_ff::sptr nlog10_ff::make(float n, size_t vlen, float k)
{
return gnuradio::make_block_sptr<nlog10_ff_impl>(n, vlen, k);
}
nlog10_ff_impl::nlog10_ff_impl(float n, size_t vlen, float k)
: sync_block("nlog10_ff",
io_signature::make(1, 1, sizeof(float) * vlen),
io_signature::make(1, 1, sizeof(float) * vlen)),
d_n_log2_10(n / log2f(10.0f)),
d_10_k_n(std::pow(10.0f, k / n)),
d_vlen(vlen)
{
const int alignment_multiple = volk_get_alignment() / sizeof(float);
set_alignment(std::max(1, alignment_multiple));
}
int nlog10_ff_impl::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
const float* in = (const float*)input_items[0];
float* out = (float*)output_items[0];
int noi = noutput_items * d_vlen;
constexpr float float_min = std::numeric_limits<float>::min();
for (int i = 0; i < noi; i++) {
out[i] = std::max(in[i], float_min);
}
if (d_10_k_n != 1.0f) {
volk_32f_s32f_multiply_32f(out, out, d_10_k_n, noi);
}
volk_32f_log2_32f(out, out, noi);
volk_32f_s32f_multiply_32f(out, out, d_n_log2_10, noi);
return noutput_items;
}
} /* namespace blocks */
} /* namespace gr */
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