/* -*- c++ -*- */
/*
 * Copyright 2004,2010,2012 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 "filter_delay_fc_impl.h"
#include <volk/volk.h>

namespace gr {
namespace filter {

filter_delay_fc::sptr filter_delay_fc::make(const std::vector<float>& taps)
{
    return gnuradio::get_initial_sptr(new filter_delay_fc_impl(taps));
}

filter_delay_fc_impl::filter_delay_fc_impl(const std::vector<float>& taps)
    : sync_block("filter_delay_fc",
                 io_signature::make(1, 2, sizeof(float)),
                 io_signature::make(1, 1, sizeof(gr_complex))),
      d_update(false)
{
    d_taps = taps;
    d_fir = new kernel::fir_filter_fff(1, taps);
    d_delay = d_fir->ntaps() / 2;
    set_history(d_fir->ntaps());

    const int alignment_multiple = volk_get_alignment() / sizeof(float);
    set_alignment(std::max(1, alignment_multiple));
}

filter_delay_fc_impl::~filter_delay_fc_impl() { delete d_fir; }

std::vector<float> filter_delay_fc_impl::taps() { return d_fir->taps(); }

void filter_delay_fc_impl::set_taps(const std::vector<float>& taps)
{
    // don't reset taps in case history changes
    d_taps = taps;
    d_update = true;
}

int filter_delay_fc_impl::work(int noutput_items,
                               gr_vector_const_void_star& input_items,
                               gr_vector_void_star& output_items)
{
    float* in0 = (float*)input_items[0];
    float* in1;
    gr_complex* out = (gr_complex*)output_items[0];

    if (d_update) {
        d_fir->set_taps(d_taps);
        d_delay = d_fir->ntaps() / 2;
        set_history(d_fir->ntaps());
        return 0;
    }

    switch (input_items.size()) {
    case 1:
        for (int i = 0; i < noutput_items; i++) {
            out[i] = gr_complex(in0[i + d_delay], d_fir->filter(&in0[i]));
        }
        break;

    case 2:
        in1 = (float*)input_items[1];
        for (int j = 0; j < noutput_items; j++) {
            out[j] = gr_complex(in0[j + d_delay], d_fir->filter(&in1[j]));
        }
        break;

    default:
        assert(0);
    }

    return noutput_items;
}

} /* namespace filter */
} /* namespace gr */
