mirror of
https://github.com/gnss-sdr/gnss-sdr
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59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
/*!
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* \file interleaved_byte_to_complex_byte.cc
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* \brief Adapts an 8-bits interleaved sample stream into a 16-bits complex stream
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* \author Carles Fernandez Prades, cfernandez(at)cttc.es
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*
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* -----------------------------------------------------------------------------
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*
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* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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* This file is part of GNSS-SDR.
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*
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* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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#include "interleaved_byte_to_complex_byte.h"
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#include <gnuradio/io_signature.h>
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#include <volk/volk.h>
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#include <algorithm> // for max
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interleaved_byte_to_complex_byte_sptr make_interleaved_byte_to_complex_byte()
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{
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return interleaved_byte_to_complex_byte_sptr(new interleaved_byte_to_complex_byte());
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}
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interleaved_byte_to_complex_byte::interleaved_byte_to_complex_byte()
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: sync_decimator("interleaved_byte_to_complex_byte",
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gr::io_signature::make(1, 1, sizeof(int8_t)),
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gr::io_signature::make(1, 1, sizeof(lv_8sc_t)), // lv_8sc_t is a Volk's typedef for std::complex<signed char>
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2)
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{
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const auto alignment_multiple = static_cast<int>(volk_get_alignment() / sizeof(lv_8sc_t));
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set_alignment(std::max(1, alignment_multiple));
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}
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int interleaved_byte_to_complex_byte::work(int noutput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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const auto *in = reinterpret_cast<const int8_t *>(input_items[0]);
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auto *out = reinterpret_cast<lv_8sc_t *>(output_items[0]);
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// This could be put into a Volk kernel
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int8_t real_part;
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int8_t imag_part;
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for (int number = 0; number < noutput_items; number++)
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{
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// lv_cmake(r, i) defined at volk/volk_complex.h
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real_part = *in++;
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imag_part = *in++;
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*out++ = lv_cmake(real_part, imag_part);
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}
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return noutput_items;
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}
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