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/* -*- c++ -*- */
/* @file
* @author Piotr Krysik <ptrkrysik@gmail.com>
* @section LICENSE
*
* Gr-gsm 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.
*
* Gr-gsm 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 gr-gsm; 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 "controlled_fractional_resampler_cc_impl.h"
#include <stdexcept>
namespace gr {
namespace gsm {
controlled_fractional_resampler_cc::sptr
controlled_fractional_resampler_cc::make(float phase_shift, float resamp_ratio)
{
return gnuradio::get_initial_sptr
(new controlled_fractional_resampler_cc_impl(phase_shift, resamp_ratio));
}
controlled_fractional_resampler_cc_impl::controlled_fractional_resampler_cc_impl
(float phase_shift, float resamp_ratio)
: block("controlled_fractional_resampler_cc",
io_signature::make(1, 1, sizeof(gr_complex)),
io_signature::make(1, 1, sizeof(gr_complex))),
d_mu(phase_shift), d_mu_inc(resamp_ratio),
d_resamp(new mmse_fir_interpolator_cc())
{
this->set_tag_propagation_policy(TPP_DONT);
if(resamp_ratio <= 0)
throw std::out_of_range("resampling ratio must be > 0");
if(phase_shift < 0 || phase_shift > 1)
throw std::out_of_range("phase shift ratio must be > 0 and < 1");
set_relative_rate(1.0 / resamp_ratio);
}
controlled_fractional_resampler_cc_impl::~controlled_fractional_resampler_cc_impl()
{
delete d_resamp;
}
void
controlled_fractional_resampler_cc_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_resamp->ntaps());
}
}
int
controlled_fractional_resampler_cc_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];
uint64_t processed_in = 0; //input samples processed in the last call to resample function
uint64_t processed_in_sum = 0; //input samples processed during a whole call to general_work function
uint64_t produced_out_sum = 0; //output samples produced during a whole call to general_work function
std::vector<tag_t> set_resamp_ratio_tags;
pmt::pmt_t key = pmt::string_to_symbol("set_resamp_ratio");
get_tags_in_window(set_resamp_ratio_tags, 0, 0, ninput_items[0]);
bool all_output_samples_produced = false;
for(std::vector<tag_t>::iterator i_tag = set_resamp_ratio_tags.begin(); i_tag < set_resamp_ratio_tags.end(); i_tag++)
{
uint64_t tag_offset_rel = i_tag->offset - nitems_read(0);
if(pmt::symbol_to_string(i_tag->key) == "set_resamp_ratio")
{
uint64_t samples_to_produce = static_cast<uint64_t>(round(static_cast<double>(tag_offset_rel-processed_in_sum)/d_mu_inc)); //tu może być problem - bo to jest głupota przy d_mu_inc różnym od 1.0
if( (samples_to_produce + produced_out_sum) > noutput_items)
{
samples_to_produce = noutput_items - produced_out_sum;
all_output_samples_produced = true;
}
processed_in = resample(in, processed_in_sum, out, produced_out_sum, samples_to_produce);
processed_in_sum = processed_in_sum + processed_in;
produced_out_sum = produced_out_sum + samples_to_produce;
if(all_output_samples_produced)
{
break;
} else {
add_item_tag(0, produced_out_sum + nitems_written(0), i_tag->key, i_tag->value);
set_resamp_ratio(pmt::to_double(i_tag->value));
}
} else {
uint64_t out_samples_to_tag = round(static_cast<double>(tag_offset_rel-processed_in_sum)/d_mu_inc);
if( (out_samples_to_tag + produced_out_sum) <= noutput_items)
{
add_item_tag(0, produced_out_sum + out_samples_to_tag + nitems_written(0), i_tag->key, i_tag->value);
}
}
}
if(!all_output_samples_produced)
{
processed_in = resample(in, processed_in_sum, out, produced_out_sum, (noutput_items-produced_out_sum));
processed_in_sum = processed_in_sum + processed_in;
}
consume_each(processed_in_sum);
return noutput_items;
}
inline uint64_t
controlled_fractional_resampler_cc_impl::resample(const gr_complex *in, uint64_t first_in_sample, gr_complex *out, uint64_t first_out_sample, uint64_t samples_to_produce)
{
int ii = first_in_sample;
int oo = first_out_sample;
while(oo < (first_out_sample+samples_to_produce)) //produce samples_to_produce number of samples
{
out[oo++] = d_resamp->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;
}
return ii-first_in_sample; //number of input samples processed
}
float
controlled_fractional_resampler_cc_impl::mu() const
{
return d_mu;
}
float
controlled_fractional_resampler_cc_impl::resamp_ratio() const
{
return d_mu_inc;
}
void
controlled_fractional_resampler_cc_impl::set_mu(float mu)
{
d_mu = mu;
}
void
controlled_fractional_resampler_cc_impl::set_resamp_ratio(float resamp_ratio)
{
d_mu_inc = resamp_ratio;
set_relative_rate(1.0 / resamp_ratio);
}
} /* namespace grgsm */
} /* namespace gr */
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