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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) 2016
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/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "ModPlugin.h"
#include <sys/types.h>
#include <stdint.h>
/* The PrbsGenerator can work as a ModInput generating a Prbs
* sequence from the given parameters only, or as a ModCodec
* XORing incoming data with the PRBS
*/
class PrbsGenerator : public ModPlugin
{
private:
uint32_t parity_check(uint32_t prbs_accum);
void gen_prbs_table();
uint32_t update_prbs();
void gen_weight_table();
size_t d_framesize;
// table of matrix products used to update a 32-bit PRBS generator
uint32_t d_prbs_table [4][256];
// table of weights for 8-bit bytes
unsigned char d_weight[256];
// PRBS polynomial generator
uint32_t d_polynomial;
// PRBS accumulator
uint32_t d_accum;
uint32_t d_accum_init;
// Initialization size
size_t d_init;
public:
PrbsGenerator(size_t framesize, uint32_t polynomial, uint32_t accum = 0,
size_t init = 0);
virtual ~PrbsGenerator();
int process(std::vector<Buffer*> dataIn, std::vector<Buffer*> dataOut);
const char* name() { return "PrbsGenerator"; }
};
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