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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2018
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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 of the
License, or (at your option) any later version.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string>
#include <stdexcept>
#include <cstdio>
#include <cstdint>
#include <cassert>
#include "PuncturingEncoder.h"
#include "PcDebug.h"
PuncturingEncoder::PuncturingEncoder() :
ModCodec(),
d_num_cu(0),
d_in_block_size(0),
d_out_block_size(0)
{
PDEBUG("PuncturingEncoder() @ %p\n", this);
}
PuncturingEncoder::PuncturingEncoder(
size_t num_cu) :
ModCodec(),
d_num_cu(num_cu),
d_in_block_size(0),
d_out_block_size(0)
{
PDEBUG("PuncturingEncoder(%zu) @ %p\n", num_cu, this);
}
void PuncturingEncoder::adjust_item_size()
{
PDEBUG("PuncturingEncoder::adjust_item_size()\n");
int in_size = 0;
int out_size = 0;
int length = 0;
for (const auto& rule : d_rules) {
for (length = rule.length(); length > 0; length -= 4) {
out_size += rule.bit_size();
in_size += 4;
}
}
if (d_tail_rule) {
in_size += d_tail_rule->length();
out_size += d_tail_rule->bit_size();
}
d_in_block_size = in_size;
d_out_block_size = (out_size + 7) / 8;
PDEBUG(" Puncturing encoder ratio (out/in): %zu / %zu\n",
d_out_block_size, d_in_block_size);
}
void PuncturingEncoder::append_rule(const PuncturingRule& rule)
{
PDEBUG("append_rule(rule(%zu, 0x%x))\n", rule.length(), rule.pattern());
d_rules.push_back(rule);
adjust_item_size();
}
void PuncturingEncoder::append_tail_rule(const PuncturingRule& rule)
{
PDEBUG("append_tail_rule(rule(%zu, 0x%x))\n",
rule.length(), rule.pattern());
d_tail_rule.reset(new PuncturingRule(rule));
adjust_item_size();
}
int PuncturingEncoder::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("PuncturingEncoder::process"
"(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
size_t in_count = 0;
size_t out_count = 0;
size_t bit_count = 0;
size_t length;
unsigned char data;
uint32_t mask;
uint32_t pattern;
auto rule_it = d_rules.begin();
PDEBUG(" in block size: %zu\n", d_in_block_size);
PDEBUG(" out block size: %zu\n", d_out_block_size);
if (d_num_cu > 0) {
if (d_num_cu * 8 == d_out_block_size + 1) {
/* EN 300 401 Table 31 in 11.3.1 UEP coding specifies
* that we need one byte of padding
*/
d_out_block_size = d_num_cu * 8;
}
if (d_num_cu * 8 != d_out_block_size) {
throw std::runtime_error(
"PuncturingEncoder encoder initialisation failed. "
" CU: " + std::to_string(d_num_cu) +
" block_size: " + std::to_string(d_out_block_size));
}
}
dataOut->setLength(d_out_block_size);
const unsigned char* in = reinterpret_cast<const unsigned char*>(dataIn->getData());
unsigned char* out = reinterpret_cast<unsigned char*>(dataOut->getData());
if (dataIn->getLength() != d_in_block_size) {
throw std::runtime_error(
"PuncturingEncoder::process wrong input size");
}
if (d_tail_rule) {
d_in_block_size -= d_tail_rule->length();
}
while (in_count < d_in_block_size) {
for (length = rule_it->length(); length > 0; length -= 4) {
mask = 0x80000000;
pattern = rule_it->pattern();
for (int i = 0; i < 4; ++i) {
data = in[in_count++];
for (int j = 0; j < 8; ++j) {
if (pattern & mask) {
out[out_count] <<= 1;
out[out_count] |= data >> 7;
if (++bit_count == 8) {
bit_count = 0;
++out_count;
}
}
data <<= 1;
mask >>= 1;
}
}
}
if (++rule_it == d_rules.end()) {
rule_it = d_rules.begin();
}
}
if (d_tail_rule) {
d_in_block_size += d_tail_rule->length();
mask = 0x800000;
pattern = d_tail_rule->pattern();
length = d_tail_rule->length();
for (size_t i = 0; i < length; ++i) {
data = in[in_count++];
for (int j = 0; j < 8; ++j) {
if (pattern & mask) {
out[out_count] <<= 1;
out[out_count] |= data >> 7;
if (++bit_count == 8) {
bit_count = 0;
++out_count;
}
}
data <<= 1;
mask >>= 1;
}
}
}
while (bit_count) {
out[out_count] <<= 1;
if (++bit_count == 8) {
bit_count = 0;
++out_count;
}
}
for (size_t i = out_count; i < dataOut->getLength(); ++i) {
out[out_count++] = 0;
}
assert(out_count == dataOut->getLength());
if (out_count != dataOut->getLength()) {
throw std::runtime_error("PuncturingEncoder::process output size "
"does not correspond!");
}
return d_out_block_size;
}
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