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/* -*- c++ -*- */
/*
* Copyright 2009 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 <noaa_hrpt_bit_sync.h>
#include <gr_io_signature.h>
#include <iostream>
noaa_hrpt_bit_sync_sptr
noaa_make_hrpt_bit_sync()
{
return gnuradio::get_initial_sptr(new noaa_hrpt_bit_sync());
}
noaa_hrpt_bit_sync::noaa_hrpt_bit_sync()
: gr_block("noaa_hrpt_bit_sync",
gr_make_io_signature(1, 1, sizeof(char)),
gr_make_io_signature(1, 1, sizeof(char))),
d_mid_bit(true),
d_last_bit(0)
{
}
int
noaa_hrpt_bit_sync::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
int ninputs = ninput_items[0];
const char *in = (const char *)input_items[0];
char *out = (char *)output_items[0];
int i = 0, j = 0;
while (i < ninputs && j < noutput_items) {
char bit = in[i++];
char diff = bit^d_last_bit;
d_last_bit = bit;
if (d_mid_bit && diff) {
out[j++] = bit;
d_mid_bit = false;
}
else
d_mid_bit = true;
}
consume_each(i);
return j;
}
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