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/* -*- c++ -*- */
/*
* Copyright 2006,2010,2012 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 "diff_encoder_bb_impl.h"
#include <gr_io_signature.h>
namespace gr {
namespace digital {
diff_encoder_bb::sptr
diff_encoder_bb::make(unsigned int modulus)
{
return gnuradio::get_initial_sptr
(new diff_encoder_bb_impl(modulus));
}
diff_encoder_bb_impl::diff_encoder_bb_impl(unsigned int modulus)
: gr_sync_block("diff_encoder_bb",
gr_make_io_signature(1, 1, sizeof(unsigned char)),
gr_make_io_signature(1, 1, sizeof(unsigned char))),
d_last_out(0), d_modulus(modulus)
{
}
diff_encoder_bb_impl::~diff_encoder_bb_impl()
{
}
int
diff_encoder_bb_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const unsigned char *in = (const unsigned char*)input_items[0];
unsigned char *out = (unsigned char*)output_items[0];
unsigned last_out = d_last_out;
unsigned modulus = d_modulus;
for(int i = 0; i < noutput_items; i++) {
out[i] = (in[i] + last_out) % modulus;
last_out = out[i];
}
d_last_out = last_out;
return noutput_items;
}
} /* namespace digital */
} /* namespace gr */
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