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/* -*- c++ -*- */
/*
* Copyright 2004,2010,2012 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 <wvps_ff_impl.h>
#include <gr_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::get_initial_sptr(new wvps_ff_impl(ilen));
}
wvps_ff_impl::wvps_ff_impl(int ilen)
: gr_sync_block("wvps_ff",
gr_make_io_signature(1, 1, sizeof(float) * ilen),
gr_make_io_signature(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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