/* -*- c++ -*- */
/*
 * Copyright 2012 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 "char_to_float_impl.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>

namespace gr {
namespace blocks {

char_to_float::sptr char_to_float::make(size_t vlen, float scale)
{
    return gnuradio::get_initial_sptr(new char_to_float_impl(vlen, scale));
}

char_to_float_impl::char_to_float_impl(size_t vlen, float scale)
    : sync_block("char_to_float",
                 io_signature::make(1, -1, sizeof(char) * vlen),
                 io_signature::make(1, 1, sizeof(float) * vlen)),
      d_vlen(vlen),
      d_scale(scale)
{
    const int alignment_multiple = volk_get_alignment() / sizeof(float);
    set_alignment(std::max(1, alignment_multiple));
}

int char_to_float_impl::work(int noutput_items,
                             gr_vector_const_void_star& input_items,
                             gr_vector_void_star& output_items)
{
    const int8_t* in = (const int8_t*)input_items[0];
    float* out = (float*)output_items[0];

    // Note: the unaligned benchmarked much faster than the aligned
    volk_8i_s32f_convert_32f_u(out, in, d_scale, d_vlen * noutput_items);

    return noutput_items;
}

} /* namespace blocks */
} /* namespace gr */
