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/* -*- c++ -*- */
/*
* Copyright 2013 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.
*/
/* @WARNING@ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "@IMPL_NAME@.h"
#include <gnuradio/io_signature.h>
#include <stdexcept>
namespace gr {
namespace analog {
@BASE_NAME@::sptr
@BASE_NAME@::make(noise_type_t type, float ampl, long seed, long samples)
{
return gnuradio::get_initial_sptr
(new @IMPL_NAME@(type, ampl, seed, samples));
}
@IMPL_NAME@::@IMPL_NAME@(noise_type_t type, float ampl, long seed, long samples)
: sync_block("@BASE_NAME@",
io_signature::make(0, 0, 0),
io_signature::make(1, 1, sizeof(@TYPE@))),
d_type(type),
#if @IS_COMPLEX@ // complex?
d_ampl(ampl/sqrtf(2.0f)),
#else
d_ampl(ampl),
#endif
d_rng(seed)
{
d_samples.resize(samples);
generate();
}
@IMPL_NAME@::~@IMPL_NAME@()
{
}
void
@IMPL_NAME@::set_type(noise_type_t type)
{
gr::thread::scoped_lock l(d_setlock);
d_type = type;
generate();
}
void
@IMPL_NAME@::set_amplitude(float ampl)
{
gr::thread::scoped_lock l(d_setlock);
#if @IS_COMPLEX@ // complex?
d_ampl = ampl/sqrtf(2.0f);
#else
d_ampl = ampl;
#endif
generate();
}
void
@IMPL_NAME@::generate()
{
int noutput_items = d_samples.size();
switch(d_type){
#if @IS_COMPLEX@ // complex?
case GR_UNIFORM:
for(int i = 0; i < noutput_items; i++)
d_samples[i] = gr_complex(d_ampl * ((d_rng.ran1() * 2.0) - 1.0),
d_ampl * ((d_rng.ran1() * 2.0) - 1.0));
break;
case GR_GAUSSIAN:
for(int i = 0; i < noutput_items; i++)
d_samples[i] = d_ampl * d_rng.rayleigh_complex();
break;
#else // nope...
case GR_UNIFORM:
for(int i = 0; i < noutput_items; i++)
d_samples[i] = (@TYPE@)(d_ampl * ((d_rng.ran1() * 2.0) - 1.0));
break;
case GR_GAUSSIAN:
for(int i = 0; i < noutput_items; i++)
d_samples[i] = (@TYPE@)(d_ampl * d_rng.gasdev());
break;
case GR_LAPLACIAN:
for(int i = 0; i < noutput_items; i++)
d_samples[i] = (@TYPE@)(d_ampl * d_rng.laplacian());
break;
case GR_IMPULSE: // FIXME changeable impulse settings
for(int i = 0; i < noutput_items; i++)
d_samples[i] = (@TYPE@)(d_ampl * d_rng.impulse(9));
break;
#endif
default:
throw std::runtime_error("invalid type");
}
}
int
@IMPL_NAME@::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
gr::thread::scoped_lock l(d_setlock);
@TYPE@ *out = (@TYPE@*)output_items[0];
for(int i=0; i<noutput_items; i++) {
out[i] = sample();
}
return noutput_items;
}
@TYPE@ @IMPL_NAME@::sample()
{
#ifdef HAVE_RAND48
size_t idx = lrand48() % d_samples.size();
#else
size_t idx = rand() % d_samples.size();
#endif
return d_samples[idx];
}
#ifndef FASTNOISE_RANDOM_SIGN
#ifndef HAVE_RAND48
#define FASTNOISE_RANDOM_SIGN ((rand()%2==0)?1:-1)
#else
#define FASTNOISE_RANDOM_SIGN ((lrand48()%2==0)?1:-1)
#endif
#endif
@TYPE@ @IMPL_NAME@::sample_unbiased()
{
#if @IS_COMPLEX@
gr_complex s(sample());
return gr_complex(FASTNOISE_RANDOM_SIGN * s.real(),
FASTNOISE_RANDOM_SIGN * s.imag());
#else
return FASTNOISE_RANDOM_SIGN * sample();
#endif
}
} /* namespace analog */
} /* namespace gr */
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