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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)
*/
/*
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 "ConvEncoder.h"
#include "PcDebug.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdexcept>
#include <string>
const static uint8_t PARITY[] = {
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0
};
ConvEncoder::ConvEncoder(size_t framesize) :
ModCodec(),
d_framesize(framesize)
{
PDEBUG("ConvEncoder::ConvEncoder(%zu)\n", framesize);
}
int ConvEncoder::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("ConvEncoder::process"
"(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
size_t in_block_size = d_framesize;
size_t out_block_size = (d_framesize * 4) + 3;
size_t in_offset = 0;
size_t out_offset = 0;
uint16_t memory = 0;
uint8_t data;
if (dataIn->getLength() != in_block_size) {
PDEBUG("%zu != %zu != 0\n", dataIn->getLength(), in_block_size);
throw std::runtime_error(
"ConvEncoder::process input size not valid!\n");
}
dataOut->setLength(out_block_size);
const uint8_t* in = reinterpret_cast<const uint8_t*>(dataIn->getData());
uint8_t* out = reinterpret_cast<uint8_t*>(dataOut->getData());
// While there is enought input and ouput items
while (dataIn->getLength() - in_offset >= in_block_size &&
dataOut->getLength() - out_offset >= out_block_size) {
for (size_t in_count = 0; in_count < in_block_size; ++in_count) {
data = in[in_offset];
//PDEBUG("Input: 0x%x\n", data);
// For next 4 output bytes
for (unsigned out_count = 0; out_count < 4; ++out_count) {
out[out_offset] = 0;
// For each 4-bit output word
for (unsigned j = 0; j < 2; ++j) {
memory >>= 1;
memory |= (data >> 7) << 6;
data <<= 1;
//PDEBUG("Memory: 0x%x\n", memory);
uint8_t poly[4] = {
(uint8_t)(memory & 0x5b),
(uint8_t)(memory & 0x79),
(uint8_t)(memory & 0x65),
(uint8_t)(memory & 0x5b)
};
//PDEBUG("Polys: 0x%x, 0x%x, 0x%x, 0x%x\n", poly[0], poly[1], poly[2], poly[3]);
// For each poly
for (unsigned k = 0; k < 4; ++k) {
out[out_offset] <<= 1;
out[out_offset] |= PARITY[poly[k]];
//PDEBUG("Out bit: %i\n", out[no] >> 7);
}
}
//PDEBUG("Out: 0x%x\n", out[no]);
++out_offset;
}
++in_offset;
}
for (unsigned pad_count = 0; pad_count < 3; ++pad_count) {
out[out_offset] = 0;
// For each 4-bit output word
for (unsigned j = 0; j < 2; ++j) {
memory >>= 1;
//PDEBUG("Memory: 0x%x\n", memory);
uint8_t poly[4] = {
(uint8_t)(memory & 0x5b),
(uint8_t)(memory & 0x79),
(uint8_t)(memory & 0x65),
(uint8_t)(memory & 0x5b)
};
//PDEBUG("Polys: 0x%x, 0x%x, 0x%x, 0x%x\n", poly[0], poly[1], poly[2], poly[3]);
// For each poly
for (unsigned k = 0; k < 4; ++k) {
out[out_offset] <<= 1;
out[out_offset] |= PARITY[poly[k]];
//PDEBUG("Out bit: %i\n", out[no] >> 7);
}
}
//PDEBUG("Out: 0x%x\n", out[no]);
++out_offset;
}
}
PDEBUG(" Consume: %zu\n", in_offset);
PDEBUG(" Return: %zu\n", out_offset);
if (out_offset != dataOut->getLength()) {
throw std::runtime_error("Assertion error: ConvEncoder output " +
std::to_string(out_offset) + " == " +
std::to_string(dataOut->getLength()) + " fail");
}
return out_offset;
}
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