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/* -*- c++ -*- */
/*
* Copyright 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 <gr_io_signature.h>
#include "plateau_detector_fb_impl.h"
namespace gr {
namespace analog {
plateau_detector_fb::sptr
plateau_detector_fb::make(int max_len, float threshold)
{
return gnuradio::get_initial_sptr (new plateau_detector_fb_impl(max_len, threshold));
}
plateau_detector_fb_impl::plateau_detector_fb_impl(int max_len, float threshold)
: gr_sync_block("plateau_detector_fb",
gr_make_io_signature(1, 1, sizeof (float)),
gr_make_io_signature(1, 1, sizeof (char))),
d_max_len(max_len),
d_threshold(threshold)
{}
plateau_detector_fb_impl::~plateau_detector_fb_impl()
{
}
int
plateau_detector_fb_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];
unsigned char *out = (unsigned char *) output_items[0];
int flank_start;
memset((void *) out, 0x00, noutput_items);
int i;
for (i = 0; i < noutput_items; i++) {
if (in[i] >= d_threshold) {
if (noutput_items-i < 2*d_max_len) { // If we can't finish, come back later
break;
}
flank_start = i;
while (i < noutput_items && in[i] >= d_threshold)
i++;
if ((i - flank_start) > 1) { // 1 Sample is not a plateau
out[flank_start + (i-flank_start)/2] = 1;
i = std::min(i+d_max_len, noutput_items-1);
}
}
}
return i;
}
} /* namespace analog */
} /* namespace gr */
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