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/* -*- c++ -*- */
/*
* Copyright 2004,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/sync_decimator.h>
namespace gr {
sync_decimator::sync_decimator(const std::string& name,
io_signature::sptr input_signature,
io_signature::sptr output_signature,
unsigned decimation)
: sync_block(name, input_signature, output_signature)
{
set_decimation(decimation);
}
void sync_decimator::forecast(int noutput_items, gr_vector_int& ninput_items_required)
{
unsigned ninputs = ninput_items_required.size();
for (unsigned i = 0; i < ninputs; i++)
ninput_items_required[i] = fixed_rate_noutput_to_ninput(noutput_items);
}
int sync_decimator::fixed_rate_noutput_to_ninput(int noutput_items)
{
return noutput_items * decimation() + history() - 1;
}
int sync_decimator::fixed_rate_ninput_to_noutput(int ninput_items)
{
return std::max(0, ninput_items - (int)history() + 1) / decimation();
}
int sync_decimator::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
int r = work(noutput_items, input_items, output_items);
if (r > 0)
consume_each(r * decimation());
return r;
}
} /* namespace gr */
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