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/* -*- c++ -*- */
/*
* Copyright 2013-2014 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 "depuncture_bb_impl.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
#include <boost/bind.hpp>
#include <pmt/pmt.h>
#include <string>
#include <stdio.h>
namespace gr {
namespace fec {
depuncture_bb::sptr
depuncture_bb::make(int puncsize, int puncpat,
int delay, char symbol)
{
return gnuradio::get_initial_sptr
(new depuncture_bb_impl(puncsize, puncpat,
delay, symbol));
}
depuncture_bb_impl::depuncture_bb_impl(int puncsize, int puncpat,
int delay, char symbol)
: block("depuncture_bb",
io_signature::make(1, 1, sizeof(unsigned char)),
io_signature::make(1, 1, sizeof(unsigned char))),
d_puncsize(puncsize), d_delay(delay), d_sym(symbol)
{
// Create a mask of all 1's of puncsize length
int mask = 0;
for(int i = 0; i < d_puncsize; i++)
mask |= 1 << i;
// Rotate the pattern for the delay value; then mask it if there
// are any excess 1's in the pattern.
for(int i = 0; i < d_delay; ++i) {
puncpat = ((puncpat & 1) << (d_puncsize - 1)) + (puncpat >> 1);
}
d_puncpat = puncpat & mask;
// Calculate the number of holes in the pattern. The mask is all
// 1's given puncsize and puncpat is a pattern with >= puncsize
// 0's (masked to ensure this). The difference between the
// number of 1's in the mask and the puncpat is the number of
// holes.
uint32_t count_mask=0, count_pat=0;
volk_32u_popcnt(&count_mask, static_cast<uint32_t>(mask));
volk_32u_popcnt(&count_pat, static_cast<uint32_t>(d_puncpat));
d_puncholes = count_mask - count_pat;
set_fixed_rate(true);
set_relative_rate((double)d_puncsize/(d_puncsize - d_puncholes));
set_output_multiple(d_puncsize);
//set_msg_handler(boost::bind(&depuncture_bb_impl::catch_msg, this, _1));
}
depuncture_bb_impl::~depuncture_bb_impl()
{
}
int
depuncture_bb_impl::fixed_rate_ninput_to_noutput(int ninput)
{
return (int)(((d_puncsize/(double)(d_puncsize - d_puncholes)) * ninput) + .5);
}
int
depuncture_bb_impl::fixed_rate_noutput_to_ninput(int noutput)
{
return (int)((((d_puncsize - d_puncholes)/(double)(d_puncsize)) * noutput) + .5);
}
void
depuncture_bb_impl::forecast(int noutput_items,
gr_vector_int& ninput_items_required)
{
ninput_items_required[0] = (int)((((d_puncsize - d_puncholes)/(double)(d_puncsize)) * noutput_items) + .5);
}
/*
void depuncture_bb_impl::catch_msg(pmt::pmt_t msg)
{
long mlong = pmt::pmt_to_long(msg);
for(int i = 0; i < mlong; ++i) {
d_puncholes = (d_puncholes >> 1) | ((d_puncholes & 1) << (d_puncsize - 1));
}
}
*/
int
depuncture_bb_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const uint8_t *in = (const uint8_t*)input_items[0];
uint8_t *out = (uint8_t*)output_items[0];
for(int i=0, k=0; i < noutput_items/output_multiple(); ++i) {
for(int j = 0; j < output_multiple(); ++j) {
out[i*output_multiple() + j] = ((d_puncpat >> (d_puncsize - 1 - j)) & 1) ? in[k++] : d_sym;
}
}
/*
GR_LOG_DEBUG(d_debug_logger, ">>>>>> start");
for(int i = 0, k=0; i < noutput_items; ++i) {
if((d_puncpat >> (d_puncsize - 1 - (i % d_puncsize))) & 1) {
GR_LOG_DEBUG(d_debug_logger, boost::format("%1%...%2%") \
% out[i] % in[k++]);
}
else {
GR_LOG_DEBUG(d_debug_logger, boost::format("snit %1%") % out[i]);
}
}
GR_LOG_DEBUG(d_debug_logger, boost::format("comp: %1%, %2%\n") \
% noutput_items % ninput_items[0]);
GR_LOG_DEBUG(d_debug_logger, boost::format("consuming %1%") \
% ((int)(((1.0/relative_rate()) * noutput_items) + .5)));
*/
consume_each((int)(((1.0/relative_rate()) * noutput_items) + .5));
return noutput_items;
}
} /* namespace fec */
} /* namespace gr */
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