/* -*- 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 "single_pole_iir_filter_ff_impl.h"
#include <gnuradio/io_signature.h>

namespace gr {
namespace filter {

single_pole_iir_filter_ff::sptr single_pole_iir_filter_ff::make(double alpha,
                                                                unsigned int vlen)
{
    return gnuradio::get_initial_sptr(new single_pole_iir_filter_ff_impl(alpha, vlen));
}

single_pole_iir_filter_ff_impl::single_pole_iir_filter_ff_impl(double alpha,
                                                               unsigned int vlen)
    : sync_block("single_pole_iir_filter_ff",
                 io_signature::make(1, 1, sizeof(float) * vlen),
                 io_signature::make(1, 1, sizeof(float) * vlen)),
      d_vlen(vlen),
      d_iir(vlen)
{
    set_taps(alpha);
}

single_pole_iir_filter_ff_impl::~single_pole_iir_filter_ff_impl() {}

void single_pole_iir_filter_ff_impl::set_taps(double alpha)
{
    for (unsigned int i = 0; i < d_vlen; i++) {
        d_iir[i].set_taps(alpha);
    }
}

int single_pole_iir_filter_ff_impl::work(int noutput_items,
                                         gr_vector_const_void_star& input_items,
                                         gr_vector_void_star& output_items)
{
    const float* in = (const float*)input_items[0];
    float* out = (float*)output_items[0];
    unsigned int vlen = d_vlen;

    if (d_vlen == 1) {
        for (int i = 0; i < noutput_items; i++) {
            out[i] = d_iir[0].filter(in[i]);
        }
    } else {
        for (int i = 0; i < noutput_items; i++) {
            for (unsigned int j = 0; j < vlen; j++) {
                *out++ = d_iir[j].filter(*in++);
            }
        }
    }
    return noutput_items;
}

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