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/* -*- c++ -*- */
/*
* Copyright 2004 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.
*/
/*
* config.h is generated by configure. It contains the results
* of probing for features, options etc. It should be the first
* file included in your .cc file.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/io_signature.h>
#include "select_vectors_impl.h"
namespace gr {
namespace dab {
select_vectors::sptr
select_vectors::make(size_t itemsize, unsigned int length, unsigned int num_select, unsigned int num_skip)
{
return gnuradio::get_initial_sptr
(new select_vectors_impl(itemsize, length, num_select, num_skip));
}
select_vectors_impl::select_vectors_impl(size_t itemsize, unsigned int length, unsigned int num_select, unsigned int num_skip)
: gr::block("select_vectors",
gr::io_signature::make (1, 1, itemsize*length),
gr::io_signature::make (1, 1, itemsize*length)),
d_itemsize(itemsize), d_length(length), d_num_select(num_select), d_num_skip(num_skip), d_index(num_select+num_skip) /* <- dont output anything before 1st trigger */
{
assert(d_num_select!=0);
assert(d_length!=0);
set_tag_propagation_policy(TPP_DONT);
}
void
select_vectors_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
int in_req = noutput_items * (d_num_skip+d_num_select)/d_num_select; /* very coarse .. */
unsigned ninputs = ninput_items_required.size ();
for (unsigned i = 0; i < ninputs; i++)
ninput_items_required[i] = in_req;
}
int
select_vectors_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 char *iptr = (const char *) input_items[0];
char *optr = (char *) output_items[0];
int n_consumed = 0;
int n_produced = 0;
std::vector<int> tag_positions;
int next_tag_position = -1;
int next_tag_position_index = -1;
// Get all stream tags with key "dab_sync", and make a vector of the positions.
// "next_tag_position" contains the position within "iptr where the next "dab_sync" stream tag is found
std::vector<tag_t> tags;
get_tags_in_range(tags, 0, nitems_read(0), nitems_read(0) + ninput_items[0], pmt::mp("first"));
for(int i=0;i<tags.size();i++) {
int current;
current = tags[i].offset - nitems_read(0);
tag_positions.push_back(current);
next_tag_position_index = 0;
}
if(next_tag_position_index >= 0) {
next_tag_position = tag_positions[next_tag_position_index];
}
//
while (n_consumed < ninput_items[0] && n_produced < noutput_items) {
if (next_tag_position == n_consumed) { /* new frame starts */
// Action when stream tags is found:
d_index=0;
//
next_tag_position_index++;
if (next_tag_position_index == tag_positions.size()) {
next_tag_position_index = -1;
next_tag_position = -1;
}
else {
next_tag_position = tag_positions[next_tag_position_index];
}
}
/* select this vector? */
if (d_index >= d_num_skip && d_index < d_num_select + d_num_skip) {
/* trigger signal */
if (d_index == d_num_skip) // Add stream tag to the output for the first symbol after 'd_num_skip'
add_item_tag(0, nitems_written(0) + n_produced, pmt::intern("first"), pmt::intern(""), pmt::intern("select_vectors"));
/* data */
memcpy(optr, iptr, d_length*d_itemsize);
iptr += d_length*d_itemsize;
optr += d_length*d_itemsize;
n_produced++;
} else {
iptr += d_length*d_itemsize;
}
d_index++;
n_consumed++;
}
consume_each(n_consumed);
return n_produced;
}
}
}
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