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/* -*- c++ -*- */
/* Copyright 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 <digital/packet_header_ofdm.h>
namespace gr {
namespace digital {
int _get_header_len_from_occupied_carriers(const std::vector<std::vector<int> > &occupied_carriers, int n_syms)
{
int header_len = 0;
for (int i = 0; i < n_syms; i++) {
header_len += occupied_carriers[i].size();
}
return header_len;
}
packet_header_ofdm::sptr
packet_header_ofdm::make(
const std::vector<std::vector<int> > &occupied_carriers,
int n_syms,
const std::string &len_tag_key,
const std::string &frame_len_tag_key,
const std::string &num_tag_key,
int bits_per_sym)
{
return packet_header_ofdm::sptr(
new packet_header_ofdm(
occupied_carriers, n_syms, len_tag_key, frame_len_tag_key, num_tag_key, bits_per_sym
)
);
}
packet_header_ofdm::packet_header_ofdm(
const std::vector<std::vector<int> > &occupied_carriers,
int n_syms,
const std::string &len_tag_key,
const std::string &frame_len_tag_key,
const std::string &num_tag_key,
int bits_per_sym)
: packet_header_default(
_get_header_len_from_occupied_carriers(occupied_carriers, n_syms),
len_tag_key,
num_tag_key,
bits_per_sym),
d_frame_len_tag_key(pmt::pmt_string_to_symbol(frame_len_tag_key)),
d_occupied_carriers(occupied_carriers),
d_syms_per_set(0)
{
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
d_syms_per_set += d_occupied_carriers[i].size();
}
}
packet_header_ofdm::~packet_header_ofdm()
{
}
bool packet_header_ofdm::header_parser(
const unsigned char *in,
std::vector<gr_tag_t> &tags)
{
if (!packet_header_default::header_parser(in, tags)) {
return false;
}
int packet_len = 0; // # of OFDM symbols
for (unsigned i = 0; i < tags.size(); i++) {
if (pmt::pmt_equal(tags[i].key, d_len_tag_key)) {
packet_len = pmt::pmt_to_long(tags[i].value);
break;
}
}
int frame_len = packet_len / d_syms_per_set;
int k = 0;
int i = frame_len * d_syms_per_set;
while (i < packet_len) {
frame_len++;
i += d_occupied_carriers[k].size();
}
gr_tag_t tag;
tag.key = d_frame_len_tag_key;
tag.value = pmt::pmt_from_long(frame_len);
tags.push_back(tag);
return true;
}
} /* namespace digital */
} /* namespace gr */
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