/* -*- 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 <gr_io_signature.h>
#include "ofdm_serializer_vcc_impl.h"
namespace gr {
namespace digital {
ofdm_serializer_vcc::sptr
ofdm_serializer_vcc::make(
int fft_len,
const std::vector<std::vector<int> > &occupied_carriers,
const std::string &len_tag_key,
const std::string &packet_len_tag_key,
int symbols_skipped,
bool input_is_shifted
)
{
return gnuradio::get_initial_sptr (
new ofdm_serializer_vcc_impl(
fft_len, occupied_carriers,
len_tag_key, packet_len_tag_key,
symbols_skipped, input_is_shifted
)
);
}
ofdm_serializer_vcc::sptr
ofdm_serializer_vcc::make(
const digital_ofdm_carrier_allocator_cvc_sptr &allocator,
const std::string &packet_len_tag_key,
int symbols_skipped,
bool input_is_shifted
)
{
return gnuradio::get_initial_sptr(
new ofdm_serializer_vcc_impl(
allocator->fft_len(),
allocator->occupied_carriers(),
allocator->len_tag_key(),
packet_len_tag_key,
symbols_skipped,
input_is_shifted
)
);
}
ofdm_serializer_vcc_impl::ofdm_serializer_vcc_impl (
int fft_len,
const std::vector<std::vector<int> > &occupied_carriers,
const std::string &len_tag_key,
const std::string &packet_len_tag_key,
int symbols_skipped,
bool input_is_shifted)
: gr_tagged_stream_block ("ofdm_serializer_vcc",
gr_make_io_signature(1, 1, sizeof (gr_complex) * fft_len),
gr_make_io_signature(1, 1, sizeof (gr_complex)),
len_tag_key),
d_fft_len(fft_len),
d_occupied_carriers(occupied_carriers),
d_packet_len_tag_key(pmt::string_to_symbol(packet_len_tag_key)),
d_out_len_tag_key(pmt::string_to_symbol((packet_len_tag_key.empty() ? len_tag_key : packet_len_tag_key))),
d_symbols_skipped(symbols_skipped % occupied_carriers.size()),
d_curr_set(symbols_skipped % occupied_carriers.size()),
d_symbols_per_set(0)
{
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
for (unsigned k = 0; k < d_occupied_carriers[i].size(); k++) {
if (d_occupied_carriers[i][k] < 0) {
d_occupied_carriers[i][k] += fft_len;
}
if (d_occupied_carriers[i][k] >= fft_len || d_occupied_carriers[i][k] < 0) {
throw std::invalid_argument("ofdm_serializer_vcc: trying to occupy a carrier outside the fft length.");
}
if (input_is_shifted) {
d_occupied_carriers[i][k] = (d_occupied_carriers[i][k] + fft_len) % fft_len;
}
}
}
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
d_symbols_per_set += d_occupied_carriers[i].size();
}
set_relative_rate((double) d_symbols_per_set / d_occupied_carriers.size());
set_tag_propagation_policy(TPP_DONT);
}
ofdm_serializer_vcc_impl::~ofdm_serializer_vcc_impl()
{
}
int
ofdm_serializer_vcc_impl::calculate_output_stream_length(const gr_vector_int &ninput_items)
{
int nout = (ninput_items[0] / d_occupied_carriers.size()) * d_symbols_per_set;
for (unsigned i = 0; i < ninput_items[0] % d_occupied_carriers.size(); i++) {
nout += d_occupied_carriers[(i + d_curr_set) % d_occupied_carriers.size()].size();
}
return nout;
}
void
ofdm_serializer_vcc_impl::update_length_tags(int n_produced, int n_ports)
{
add_item_tag(0, nitems_written(0),
d_out_len_tag_key,
pmt::from_long(n_produced)
);
}
int
ofdm_serializer_vcc_impl::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];
long frame_length = ninput_items[0]; // Input frame
long packet_length = 0; // Output frame
int carr_offset = 0;
std::vector<gr_tag_t> tags;
// Packet mode
if (!d_length_tag_key_str.empty()) {
get_tags_in_range(tags, 0, nitems_read(0), nitems_read(0)+1);
for (unsigned i = 0; i < tags.size(); i++) {
if (pmt::symbol_to_string(tags[i].key) == "ofdm_sync_carr_offset") {
carr_offset = pmt::to_long(tags[i].value);
}
if (tags[i].key == d_packet_len_tag_key) {
packet_length = pmt::to_long(tags[i].value);
remove_item_tag(0, tags[i]);
}
}
} else {
// recalc frame length from noutput_items
frame_length = 0;
int sym_per_frame = 0;
while ((sym_per_frame + d_occupied_carriers[(frame_length + 1) % d_occupied_carriers.size()].size()) < noutput_items) {
frame_length++;
sym_per_frame += d_occupied_carriers[(frame_length + 1) % d_occupied_carriers.size()].size();
}
}
// Copy symbols
int n_out_symbols = 0;
for (int i = 0; i < frame_length; i++) {
// Copy all tags associated with this input OFDM symbol onto the first output symbol
get_tags_in_range(tags, 0,
nitems_read(0)+i,
nitems_read(0)+i+1
);
for (unsigned t = 0; t < tags.size(); t++) {
add_item_tag(0, nitems_written(0)+n_out_symbols,
tags[i].key,
tags[i].value
);
}
for (unsigned k = 0; k < d_occupied_carriers[d_curr_set].size(); k++) {
out[n_out_symbols++] = in[i * d_fft_len + d_occupied_carriers[d_curr_set][k] + carr_offset];
}
if (packet_length && n_out_symbols > packet_length) {
n_out_symbols = packet_length;
break;
}
d_curr_set = (d_curr_set + 1) % d_occupied_carriers.size();
}
// Housekeeping
if (d_length_tag_key_str.empty()) {
consume_each(frame_length);
} else {
d_curr_set = d_symbols_skipped;
}
return n_out_symbols;
}
} /* namespace digital */
} /* namespace gr */