gnss-sdr/src/algorithms/libs/cshort_to_float_x2.cc

/*!
 * \file cshort_to_float_x2.cc
 * \brief Adapts a std::complex<short> stream into two float streams
 * \author Carles Fernandez Prades, cfernandez(at)cttc.es
 *
 *
 * -----------------------------------------------------------------------------
 *
 * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
 * This file is part of GNSS-SDR.
 *
 * Copyright (C) 2010-2020  (see AUTHORS file for a list of contributors)
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * -----------------------------------------------------------------------------
 */


#include "cshort_to_float_x2.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
#include <algorithm>  // for max


cshort_to_float_x2_sptr make_cshort_to_float_x2()
{
    return cshort_to_float_x2_sptr(new cshort_to_float_x2());
}


cshort_to_float_x2::cshort_to_float_x2() : sync_block("cshort_to_float_x2",
                                               gr::io_signature::make(1, 1, sizeof(lv_16sc_t)),  // lv_8sc_t is a Volk's typedef for std::complex<signed char>
                                               gr::io_signature::make(2, 2, sizeof(float)))
{
    const auto alignment_multiple = static_cast<int>(volk_get_alignment() / sizeof(lv_16sc_t));
    set_alignment(std::max(1, alignment_multiple));
}


int cshort_to_float_x2::work(int noutput_items,
    gr_vector_const_void_star &input_items,
    gr_vector_void_star &output_items)
{
    const auto *in = reinterpret_cast<const lv_16sc_t *>(input_items[0]);
    auto *out0 = reinterpret_cast<float *>(output_items[0]);
    auto *out1 = reinterpret_cast<float *>(output_items[1]);
    const float scalar = 1;
    volk_16ic_s32f_deinterleave_32f_x2(out0, out1, in, scalar, noutput_items);
    return noutput_items;
}