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/* -*- c++ -*- */
/*
* Copyright 2004,2007,2010,2012 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 <gnuradio/io_signature.h>
#include "sro_model_impl.h"
#include <stdexcept>
namespace gr {
namespace channels {
sro_model::sptr
sro_model::make(
double sample_rate_hz,
double std_dev_hz,
double max_dev_hz,
double noise_seed)
{
return gnuradio::get_initial_sptr(
new sro_model_impl(sample_rate_hz, std_dev_hz, max_dev_hz, noise_seed));
}
sro_model_impl::sro_model_impl(
double sample_rate_hz,
double std_dev_hz,
double max_dev_hz,
double noise_seed)
: block("sro_model",
io_signature::make(1, 1, sizeof(gr_complex)),
io_signature::make(1, 1, sizeof(gr_complex))),
d_mu (0.0), d_mu_inc (1.0), d_sro(0.0), d_samp_rate(sample_rate_hz),
d_max_dev_hz(max_dev_hz),
d_interp(new gr::filter::mmse_fir_interpolator_cc()),
d_noise(gr::analog::fastnoise_source_f::make(analog::GR_GAUSSIAN, std_dev_hz, noise_seed))
{
//set_relative_rate(1.0 / interp_ratio);
set_relative_rate(1.0);
}
sro_model_impl::~sro_model_impl()
{
delete d_interp;
}
void
sro_model_impl::forecast(int noutput_items,
gr_vector_int &ninput_items_required)
{
unsigned ninputs = ninput_items_required.size();
for(unsigned i=0; i < ninputs; i++) {
ninput_items_required[i] =
(int)ceil((noutput_items * (d_mu_inc + d_max_dev_hz/d_samp_rate)) + d_interp->ntaps());
}
}
int
sro_model_impl::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_complex *in = (const gr_complex*)input_items[0];
gr_complex *out = (gr_complex*)output_items[0];
int ii = 0; // input index
int oo = 0; // output index
while(oo < noutput_items) {
// perform sample rate offset update
d_sro += d_noise->sample_unbiased();
d_sro = std::min(d_sro, d_max_dev_hz);
d_sro = std::max(d_sro, -d_max_dev_hz);
d_mu_inc = 1.0 + d_sro/d_samp_rate;
out[oo++] = d_interp->interpolate(&in[ii], d_mu);
double s = d_mu + d_mu_inc;
double f = floor(s);
int incr = (int)f;
d_mu = s - f;
ii += incr;
}
consume_each(ii);
return noutput_items;
}
float
sro_model_impl::mu() const
{
return d_mu;
}
float
sro_model_impl::interp_ratio() const
{
return d_mu_inc;
}
void
sro_model_impl::set_mu(float mu)
{
d_mu = mu;
}
void
sro_model_impl::set_interp_ratio(float interp_ratio)
{
d_mu_inc = interp_ratio;
}
void
sro_model_impl::setup_rpc()
{
#ifdef GR_CTRLPORT
add_rpc_variable(
rpcbasic_sptr(new rpcbasic_register_variable<float>(
alias(), "sro", &d_sro,
pmt::mp(-10.0f), pmt::mp(10.0f), pmt::mp(0.0f),
"", "Current SRO in Hz", RPC_PRIVLVL_MIN,
DISPTIME | DISPOPTSTRIP)));
add_rpc_variable(
rpcbasic_sptr(new rpcbasic_register_variable<float>(
alias(), "sro_max", &d_max_dev_hz,
pmt::mp(-10.0f), pmt::mp(10.0f), pmt::mp(0.0f),
"", "Max SRO in Hz", RPC_PRIVLVL_MIN,
DISPTIME | DISPOPTSTRIP)));
#endif /* GR_CTRLPORT */
}
} /* namespace filter */
} /* namespace gr */
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