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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This 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.
*
* This software 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 this software; 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_impl.h"
#include "gnuradio/dtv/atsc_consts.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace dtv {
atsc_randomizer::sptr atsc_randomizer::make()
{
return gnuradio::get_initial_sptr(new atsc_randomizer_impl());
}
atsc_randomizer_impl::atsc_randomizer_impl()
: gr::sync_block("atsc_randomizer",
gr::io_signature::make(1, 1, sizeof(atsc_mpeg_packet)),
gr::io_signature::make(1, 1, sizeof(atsc_mpeg_packet_no_sync)))
{
reset();
}
atsc_randomizer_impl::~atsc_randomizer_impl() {}
void atsc_randomizer_impl::reset()
{
d_rand.reset();
d_field2 = false;
d_segno = 0;
}
int atsc_randomizer_impl::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]);
}
// Tell runtime system how many output items we produced.
return noutput_items;
}
} /* namespace dtv */
} /* namespace gr */
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