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/* -*- c++ -*- */
/*
* Copyright 2004 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 2, 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <trellis_encoder_bs.h>
#include <gr_io_signature.h>
#include <iostream>
trellis_encoder_bs_sptr
trellis_make_encoder_bs (const fsm &FSM, int ST)
{
return trellis_encoder_bs_sptr (new trellis_encoder_bs (FSM,ST));
}
trellis_encoder_bs::trellis_encoder_bs (const fsm &FSM, int ST)
: gr_sync_block ("encoder_bs",
gr_make_io_signature (1, -1, sizeof (unsigned char)),
gr_make_io_signature (1, -1, sizeof (short))),
d_FSM (FSM),
d_ST (ST)
{
}
int
trellis_encoder_bs::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
int ST_tmp;
assert (input_items.size() == output_items.size());
int nstreams = input_items.size();
for (int m=0;m<nstreams;m++) {
const unsigned char *in = (const unsigned char *) input_items[m];
short *out = (short *) output_items[m];
ST_tmp = d_ST;
// per stream processing
for (int i = 0; i < noutput_items; i++){
out[i] = (short) d_FSM.OS()[ST_tmp*d_FSM.I()+in[i]]; // direction of time?
ST_tmp = (int) d_FSM.NS()[ST_tmp*d_FSM.I()+in[i]];
}
// end per stream processing
}
d_ST = ST_tmp;
return noutput_items;
}
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