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/* -*- c++ -*- */
/*
* Copyright 2004,2007,2008,2010,2012 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 "fft_vfc_fftw.h"
#include <gnuradio/io_signature.h>
#include <math.h>
#include <string.h>
namespace gr {
namespace fft {
fft_vfc::sptr
fft_vfc::make(int fft_size, bool forward, const std::vector<float>& window, int nthreads)
{
return gnuradio::get_initial_sptr(
new fft_vfc_fftw(fft_size, forward, window, nthreads));
}
fft_vfc_fftw::fft_vfc_fftw(int fft_size,
bool forward,
const std::vector<float>& window,
int nthreads)
: sync_block("fft_vfc_fftw",
io_signature::make(1, 1, fft_size * sizeof(float)),
io_signature::make(1, 1, fft_size * sizeof(gr_complex))),
d_fft_size(fft_size),
d_forward(forward)
{
d_fft = new fft_complex(d_fft_size, d_forward, nthreads);
if (!set_window(window))
throw std::runtime_error("fft_vfc: window not the same length as fft_size\n");
}
fft_vfc_fftw::~fft_vfc_fftw() { delete d_fft; }
void fft_vfc_fftw::set_nthreads(int n) { d_fft->set_nthreads(n); }
int fft_vfc_fftw::nthreads() const { return d_fft->nthreads(); }
bool fft_vfc_fftw::set_window(const std::vector<float>& window)
{
if (window.empty() || window.size() == d_fft_size) {
d_window = window;
return true;
} else
return false;
}
int fft_vfc_fftw::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];
gr_complex* out = (gr_complex*)output_items[0];
unsigned int output_data_size = output_signature()->sizeof_stream_item(0);
int count = 0;
while (count++ < noutput_items) {
// copy input into optimally aligned buffer
if (!d_window.empty()) {
gr_complex* dst = d_fft->get_inbuf();
for (unsigned int i = 0; i < d_fft_size; i++) // apply window
dst[i] = in[i] * d_window[i];
} else {
gr_complex* dst = d_fft->get_inbuf();
for (unsigned int i = 0; i < d_fft_size; i++) // float to complex conversion
dst[i] = in[i];
}
// compute the fft
d_fft->execute();
// copy result to output stream
memcpy(out, d_fft->get_outbuf(), output_data_size);
in += d_fft_size;
out += d_fft_size;
}
return noutput_items;
}
} /* namespace fft */
} /* namespace gr */
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