gpio_and_const_ss.cc

这是用python语言写的一个数字广播的信号处理工具包。利用它

/* -*- c++ -*- */
/*
 * Copyright 2008 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 <gpio_and_const_ss.h>
#include <gr_io_signature.h>

gpio_and_const_ss_sptr
gpio_make_and_const_ss (unsigned short k)
{
  return gpio_and_const_ss_sptr (new gpio_and_const_ss (k));
}

gpio_and_const_ss::gpio_and_const_ss (unsigned short k)
  : gr_sync_block ("and_const_ss",
		   gr_make_io_signature (1, 1, sizeof (short)),
		   gr_make_io_signature (1, 1, sizeof (short))),
    d_k (k)
{
}

int
gpio_and_const_ss::work (int noutput_items,
		   gr_vector_const_void_star &input_items,
		   gr_vector_void_star &output_items)
{
  short *iptr = (short *) input_items[0];
  short *optr = (short *) output_items[0];

  int	size = noutput_items;

  while (size >= 8){
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    *optr++ = *iptr++ & d_k;
    size -= 8;
  }

  while (size-- > 0)
    *optr++ = *iptr++ & d_k;
  
  return noutput_items;
}