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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 <gnuradio/io_signature.h>
#include "dvb_bbscrambler_bb_impl.h"
namespace gr {
namespace dtv {
dvb_bbscrambler_bb::sptr
dvb_bbscrambler_bb::make(dvb_standard_t standard, dvb_framesize_t framesize, dvb_code_rate_t rate)
{
return gnuradio::get_initial_sptr
(new dvb_bbscrambler_bb_impl(standard, framesize, rate));
}
/*
* The private constructor
*/
dvb_bbscrambler_bb_impl::dvb_bbscrambler_bb_impl(dvb_standard_t standard, dvb_framesize_t framesize, dvb_code_rate_t rate)
: gr::sync_block("dvb_bbscrambler_bb",
gr::io_signature::make(1, 1, sizeof(unsigned char)),
gr::io_signature::make(1, 1, sizeof(unsigned char)))
{
if (framesize == FECFRAME_NORMAL) {
switch (rate) {
case C1_4:
kbch = 16008;
break;
case C1_3:
kbch = 21408;
break;
case C2_5:
kbch = 25728;
break;
case C1_2:
kbch = 32208;
break;
case C3_5:
kbch = 38688;
break;
case C2_3:
kbch = 43040;
break;
case C3_4:
kbch = 48408;
break;
case C4_5:
kbch = 51648;
break;
case C5_6:
kbch = 53840;
break;
case C8_9:
kbch = 57472;
break;
case C9_10:
kbch = 58192;
break;
case C13_45:
kbch = 18528;
break;
case C9_20:
kbch = 28968;
break;
case C90_180:
kbch = 32208;
break;
case C96_180:
kbch = 34368;
break;
case C11_20:
kbch = 35448;
break;
case C100_180:
kbch = 35808;
break;
case C104_180:
kbch = 37248;
break;
case C26_45:
kbch = 37248;
break;
case C18_30:
kbch = 38688;
break;
case C28_45:
kbch = 40128;
break;
case C23_36:
kbch = 41208;
break;
case C116_180:
kbch = 41568;
break;
case C20_30:
kbch = 43008;
break;
case C124_180:
kbch = 44448;
break;
case C25_36:
kbch = 44808;
break;
case C128_180:
kbch = 45888;
break;
case C13_18:
kbch = 46608;
break;
case C132_180:
kbch = 47328;
break;
case C22_30:
kbch = 47328;
break;
case C135_180:
kbch = 48408;
break;
case C140_180:
kbch = 50208;
break;
case C7_9:
kbch = 50208;
break;
case C154_180:
kbch = 55248;
break;
default:
kbch = 0;
break;
}
}
else {
switch (rate) {
case C1_4:
kbch = 3072;
break;
case C1_3:
kbch = 5232;
break;
case C2_5:
kbch = 6312;
break;
case C1_2:
kbch = 7032;
break;
case C3_5:
kbch = 9552;
break;
case C2_3:
kbch = 10632;
break;
case C3_4:
kbch = 11712;
break;
case C4_5:
kbch = 12432;
break;
case C5_6:
kbch = 13152;
break;
case C8_9:
kbch = 14232;
break;
case C11_45:
kbch = 3792;
break;
case C4_15:
kbch = 4152;
break;
case C14_45:
kbch = 4872;
break;
case C7_15:
kbch = 7392;
break;
case C8_15:
kbch = 8472;
break;
case C26_45:
kbch = 9192;
break;
case C32_45:
kbch = 11352;
break;
default:
kbch = 0;
break;
}
}
init_bb_randomiser();
set_output_multiple(kbch);
}
/*
* Our virtual destructor.
*/
dvb_bbscrambler_bb_impl::~dvb_bbscrambler_bb_impl()
{
}
void
dvb_bbscrambler_bb_impl::init_bb_randomiser(void)
{
int sr = 0x4A80;
for (int i = 0; i < FRAME_SIZE_NORMAL; i++) {
int b = ((sr) ^ (sr >> 1)) & 1;
bb_randomise[i] = b;
sr >>= 1;
if(b) {
sr |= 0x4000;
}
}
}
int
dvb_bbscrambler_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];
for (int i = 0; i < noutput_items; i += kbch) {
for (int j = 0; j < (int)kbch; ++j)
{
out[i + j] = in[i + j] ^ bb_randomise[j];
}
}
// Tell runtime system how many output items we produced.
return noutput_items;
}
} /* namespace dtv */
} /* namespace gr */
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