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/* -*- c++ -*- */
/*
* Copyright 2004,2010,2012,2019 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 "wvps_ff_impl.h"
#include <gnuradio/io_signature.h>
#include <string.h>
namespace gr {
namespace wavelet {
static int ceil_log2(int k)
{
int m = 0;
for (int n = k - 1; n > 0; n >>= 1)
m++;
return m;
}
wvps_ff::sptr wvps_ff::make(int ilen)
{
return gnuradio::make_block_sptr<wvps_ff_impl>(ilen);
}
wvps_ff_impl::wvps_ff_impl(int ilen)
: sync_block("wvps_ff",
io_signature::make(1, 1, sizeof(float) * ilen),
io_signature::make(1, 1, sizeof(float) * ceil_log2(ilen))),
d_ilen(ilen),
d_olen(ceil_log2(ilen))
{
}
// input vector assumed to be output from gsl wavelet computation
int wvps_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];
for (int count = 0; count < noutput_items; count++) {
// any power?
if (in[0] == 0.0) {
for (int i = 0; i < d_olen; i++)
out[i] = 0.0;
} else {
// get power normalization from 0-th wavelet coefficient
float scl = 1.0 / (in[0] * in[0]);
int k = 1;
// sum powers over sequences of bins,
// sequence lengths in increasing powers of 2
for (int e = 0; e < d_olen; e++) {
int m = 01 << e;
float sum = 0.0;
for (int l = 0; l < m; l++)
sum += (in[k + l] * in[k + l]);
out[e] = scl * sum;
k += m;
}
}
in += d_ilen;
out += d_olen;
}
return noutput_items;
}
} /* namespace wavelet */
} /* namespace gr */
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