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/* -*- c++ -*- */
/*
* Copyright 2006,2010 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 <atsc_randomizer.h>
#include <gr_io_signature.h>
#include <atsc_consts.h>
atsc_randomizer_sptr
atsc_make_randomizer()
{
return gnuradio::get_initial_sptr(new atsc_randomizer());
}
atsc_randomizer::atsc_randomizer()
: gr_sync_block("atsc_randomizer",
gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet)),
gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet_no_sync)))
{
reset();
}
void
atsc_randomizer::reset()
{
d_rand.reset();
d_field2 = false;
d_segno = 0;
}
int
atsc_randomizer::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const atsc_mpeg_packet *in = (const atsc_mpeg_packet *) input_items[0];
atsc_mpeg_packet_no_sync *out = (atsc_mpeg_packet_no_sync *) output_items[0];
for (int i = 0; i < noutput_items; i++){
// sanity check incoming data.
assert((in[i].data[0] == MPEG_SYNC_BYTE));
assert((in[i].data[1] & MPEG_TRANSPORT_ERROR_BIT) == 0);
// initialize plinfo for downstream
//
// We do this here because the randomizer is effectively
// the head of the tx processing chain
//
out[i].pli.set_regular_seg(d_field2, d_segno);
d_segno++;
if (d_segno == 312){
d_segno = 0;
d_field2 = !d_field2;
}
if (out[i].pli.first_regular_seg_p())
d_rand.reset();
d_rand.randomize(out[i], in[i]);
}
return noutput_items;
}
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