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/*
Copyright (C) 2013 Matthias P. Braendli
http://mpb.li
EDI output,
Protection, Fragmentation and Transport. (PFT)
Are supported:
Reed-Solomon and Fragmentation
This implements part of PFT as defined ETSI TS 102 821.
*/
/*
This file is part of CRC-DabMux.
CRC-DabMux 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.
CRC-DabMux 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 CRC-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _PFT_H_
#define _PFT_H_
#include "config.h"
#include <vector>
#include <list>
#include <stdexcept>
#include <stdint.h>
#include "AFPacket.h"
#include "Log.h"
#include "ReedSolomon.h"
typedef std::vector<uint8_t> RSPacket;
class PFT
{
public:
static const int ParityBytes = 48;
PFT(unsigned int RSDataWordLength, unsigned int NumRecoverableFragments) :
m_k(RSDataWordLength),
m_m(NumRecoverableFragments),
m_encoder(m_k + ParityBytes, m_k)
{
if (m_k > 207) {
etiLog.level(warn) <<
"EDI PFT: maximum chunk size is 207.";
throw std::out_of_range("EDI PFT Chunk size too large.");
}
if (m_m > 5) {
etiLog.level(warn) <<
"EDI PFT: high number of recoverable fragments"
" may lead to large overhead";
// See TS 102 821, 7.2.1 Known values, list entry for 'm'
}
}
// Apply Reed-Solomon FEC to the AF Packet
RSPacket Protect(AFPacket af_packet);
// Cut a RSPacket into several fragments that can be transmitted
std::vector< std::vector<uint8_t> > ProtectAndFragment(AFPacket af_packet);
private:
unsigned int m_k; // length of RS data word
unsigned int m_m; // number of fragments that can be recovered if lost
size_t m_num_chunks;
ReedSolomon m_encoder;
};
#endif
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