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/* -*- c++ -*- */
/*
* Copyright 2008,2010,2013 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 "stretch_ff_impl.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace blocks {
stretch_ff::sptr stretch_ff::make(float lo, size_t vlen)
{
return gnuradio::get_initial_sptr(new stretch_ff_impl(lo, vlen));
}
stretch_ff_impl::stretch_ff_impl(float lo, size_t vlen)
: sync_block("stretch_ff",
io_signature::make(1, 1, vlen * sizeof(float)),
io_signature::make(1, 1, vlen * sizeof(float))),
d_lo(lo),
d_vlen(vlen)
{
}
stretch_ff_impl::~stretch_ff_impl() {}
int stretch_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++) {
float vmax = in[0] - d_lo;
for (unsigned int i = 1; i < d_vlen; i++) {
float vtmp = in[i] - d_lo;
if (vtmp > vmax)
vmax = vtmp;
}
if (vmax != 0.0)
for (unsigned int i = 0; i < d_vlen; i++)
out[i] = d_lo * (1.0 - (in[i] - d_lo) / vmax);
else
for (unsigned int i = 0; i < d_vlen; i++)
out[i] = in[i];
in += d_vlen;
out += d_vlen;
}
return noutput_items;
}
} /* namespace blocks */
} /* namespace gr */
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