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/* -*- c++ -*- */
/*
* Copyright 2012,2018 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 "keep_m_in_n_impl.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace blocks {
keep_m_in_n::sptr
keep_m_in_n::make(size_t itemsize, int m, int n, int offset)
{
return gnuradio::get_initial_sptr
(new keep_m_in_n_impl(itemsize, m, n, offset));
}
keep_m_in_n_impl::keep_m_in_n_impl(size_t itemsize, int m, int n, int offset)
: block("keep_m_in_n",
io_signature::make (1, 1, itemsize),
io_signature::make (1, 1, itemsize)),
d_m(m),
d_n(n),
d_offset(offset),
d_itemsize(itemsize)
{
// sanity checking
if(d_m <= 0) {
std::string s = boost::str(boost::format("keep_m_in_n: m=%1% but must be > 0") % d_m);
throw std::runtime_error(s);
}
if(d_n <= 0) {
std::string s = boost::str(boost::format("keep_m_in_n: n=%1% but must be > 0") % d_n);
throw std::runtime_error(s);
}
if(d_m > d_n) {
std::string s = boost::str(boost::format("keep_m_in_n: m (%1%) <= n %2%") % d_m % d_n);
throw std::runtime_error(s);
}
if(d_offset < 0) {
std::string s = boost::str(boost::format("keep_m_in_n: offset (%1%) must be >= 0") \
% d_offset);
throw std::runtime_error(s);
}
if(d_offset >= d_n) {
std::string s = boost::str(boost::format("keep_m_in_n: offset (%1%) < n (%2%)") \
% d_offset % d_n);
throw std::runtime_error(s);
}
set_output_multiple(m);
set_relative_rate(static_cast<uint64_t>(d_m), static_cast<uint64_t>(d_n));
}
void
keep_m_in_n_impl::forecast(int noutput_items, gr_vector_int &ninput_items_required)
{
ninput_items_required[0] = d_n*(noutput_items/d_m);
}
void
keep_m_in_n_impl::set_m(int m)
{
d_m = m;
set_output_multiple(m);
set_relative_rate(static_cast<uint64_t>(d_m), static_cast<uint64_t>(d_n));
}
void
keep_m_in_n_impl::set_n(int n)
{
d_n = n;
set_relative_rate(static_cast<uint64_t>(d_m), static_cast<uint64_t>(d_n));
}
void
keep_m_in_n_impl::set_offset(int offset)
{
d_offset = offset;
}
int
keep_m_in_n_impl::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
uint8_t* out = (uint8_t*)output_items[0];
const uint8_t* in = (const uint8_t*)input_items[0];
// iterate over data blocks of size {n, input : m, output}
int blks = std::min(noutput_items/d_m, ninput_items[0]/d_n);
int excess = (d_offset + d_m - d_n) * d_itemsize;
for(int i=0; i<blks; i++) {
// set up copy pointers
const uint8_t* iptr = &in[(i*d_n + d_offset)*d_itemsize];
uint8_t* optr = &out[i*d_m*d_itemsize];
// perform copy
if(excess <= 0) {
memcpy( optr, iptr, d_m*d_itemsize );
} else {
memcpy( optr, &in[i*d_n*d_itemsize], excess);
memcpy( optr + excess, iptr, d_m*d_itemsize - excess);
}
}
consume_each(blks*d_n);
return blks*d_m;
}
} /* namespace blocks */
} /* namespace gr */
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