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/* -*- c++ -*- */
/*
* Copyright 2004,2010,2012 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 <digital_simple_framer.h>
#include <digital_simple_framer_sync.h>
#include <gr_io_signature.h>
#include <assert.h>
#include <stdexcept>
#include <string.h>
digital_simple_framer_sptr
digital_make_simple_framer (int payload_bytesize)
{
return gnuradio::get_initial_sptr(new digital_simple_framer
(payload_bytesize));
}
digital_simple_framer::digital_simple_framer (int payload_bytesize)
: gr_block ("simple_framer",
gr_make_io_signature (1, 1, sizeof (unsigned char)),
gr_make_io_signature (1, 1, sizeof (unsigned char))),
d_seqno (0), d_payload_bytesize (payload_bytesize),
d_input_block_size (payload_bytesize),
d_output_block_size (payload_bytesize + GRSF_OVERHEAD)
{
set_output_multiple (d_output_block_size);
}
void
digital_simple_framer::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
assert (noutput_items % d_output_block_size == 0);
int nblocks = noutput_items / d_output_block_size;
int input_required = nblocks * d_input_block_size;
unsigned ninputs = ninput_items_required.size();
for (unsigned int i = 0; i < ninputs; i++)
ninput_items_required[i] = input_required;
}
int
digital_simple_framer::general_work (int noutput_items,
gr_vector_int &ninput_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];
int n = 0;
int nblocks = 0;
memset (out, 0x55, noutput_items);
while (n < noutput_items) {
out[0] = (GRSF_SYNC >> 56) & 0xff;
out[1] = (GRSF_SYNC >> 48) & 0xff;
out[2] = (GRSF_SYNC >> 40) & 0xff;
out[3] = (GRSF_SYNC >> 32) & 0xff;
out[4] = (GRSF_SYNC >> 24) & 0xff;
out[5] = (GRSF_SYNC >> 16) & 0xff;
out[6] = (GRSF_SYNC >> 8) & 0xff;
out[7] = (GRSF_SYNC >> 0) & 0xff;
out[8] = d_seqno++;
memcpy (&out[9], in, d_input_block_size);
in += d_input_block_size;
out += d_output_block_size;
n += d_output_block_size;
nblocks++;
}
assert (n == noutput_items);
consume_each (nblocks * d_input_block_size);
return n;
}
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