goertzel_fc_impl.cc

/* -*- c++ -*- */
/*
 * Copyright 2006,2010-2012 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 "goertzel_fc_impl.h"
#include <gnuradio/io_signature.h>

namespace gr {
  namespace fft {
    
    goertzel_fc::sptr goertzel_fc::make(int rate, int len, float freq)
    {
      return gnuradio::get_initial_sptr(new goertzel_fc_impl(rate, len, freq));
    }
    
    goertzel_fc_impl::goertzel_fc_impl(int rate, int len, float freq)
      : sync_decimator("goertzel_fc",
			  io_signature::make (1, 1, sizeof(float)),
			  io_signature::make (1, 1, sizeof(gr_complex)),
			  len),
	d_goertzel(rate, len, freq)
    {
      d_len = len;
      d_rate = rate;
      d_freq = freq;
    }
    
    goertzel_fc_impl::~goertzel_fc_impl()
    {
    }

    void
    goertzel_fc_impl::set_freq(float freq)
    {
      d_freq = freq;
      d_goertzel.set_params(d_rate, d_len, d_freq);
    }

    void
    goertzel_fc_impl::set_rate(int rate)
    {
      d_rate = rate;
      d_goertzel.set_params(d_rate, d_len, d_freq);
    }
    
    int
    goertzel_fc_impl::work(int noutput_items,
			   gr_vector_const_void_star &input_items,
			   gr_vector_void_star &output_items)
    {
      float *in = (float *)input_items[0];
      gr_complex *out = (gr_complex *)output_items[0];
      
      for(int i = 0; i < noutput_items; i++) {
	*out++ = d_goertzel.batch(in);
	in += d_len;
      }
      
      return noutput_items;
    }

  } /* namespace fft */
} /* namespace gr */