mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-12-23 18:15:45 -05:00
136 lines
3.3 KiB
C++
136 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
|
|
// //
|
|
// This program 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 as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////////
|
|
/*
|
|
LDPC table iterator
|
|
|
|
Copyright 2018 Ahmet Inan <xdsopl@gmail.com>
|
|
*/
|
|
|
|
#ifndef LDPC_HH
|
|
#define LDPC_HH
|
|
|
|
namespace ldpctool {
|
|
|
|
|
|
struct LDPCInterface
|
|
{
|
|
virtual LDPCInterface *clone() = 0;
|
|
virtual int code_len() = 0;
|
|
virtual int data_len() = 0;
|
|
virtual int group_len() = 0;
|
|
virtual int links_total() = 0;
|
|
virtual int links_max_cn() = 0;
|
|
virtual int bit_deg() = 0;
|
|
virtual int *acc_pos() = 0;
|
|
virtual void first_bit() = 0;
|
|
virtual void next_bit() = 0;
|
|
virtual ~LDPCInterface() = default;
|
|
static const char *mc_tabnames[2][32];
|
|
};
|
|
|
|
template <typename TABLE>
|
|
class LDPC : public LDPCInterface
|
|
{
|
|
static const int M = TABLE::M;
|
|
static const int N = TABLE::N;
|
|
static const int K = TABLE::K;
|
|
static const int R = N-K;
|
|
static const int q = R/M;
|
|
|
|
int acc_pos_[TABLE::DEG_MAX];
|
|
const int *row_ptr;
|
|
int bit_deg_;
|
|
int grp_num;
|
|
int grp_len;
|
|
int grp_cnt;
|
|
int row_cnt;
|
|
|
|
void next_group()
|
|
{
|
|
if (grp_cnt >= grp_len) {
|
|
grp_len = TABLE::LEN[grp_num];
|
|
bit_deg_ = TABLE::DEG[grp_num];
|
|
grp_cnt = 0;
|
|
++grp_num;
|
|
}
|
|
for (int i = 0; i < bit_deg_; ++i)
|
|
acc_pos_[i] = row_ptr[i];
|
|
row_ptr += bit_deg_;
|
|
++grp_cnt;
|
|
}
|
|
public:
|
|
LDPCInterface *clone()
|
|
{
|
|
return new LDPC<TABLE>();
|
|
}
|
|
int code_len()
|
|
{
|
|
return N;
|
|
}
|
|
int data_len()
|
|
{
|
|
return K;
|
|
}
|
|
int group_len()
|
|
{
|
|
return M;
|
|
}
|
|
int links_total()
|
|
{
|
|
return TABLE::LINKS_TOTAL;
|
|
}
|
|
int links_max_cn()
|
|
{
|
|
return TABLE::LINKS_MAX_CN;
|
|
}
|
|
int bit_deg()
|
|
{
|
|
return bit_deg_;
|
|
}
|
|
int *acc_pos()
|
|
{
|
|
return acc_pos_;
|
|
}
|
|
void next_bit()
|
|
{
|
|
if (++row_cnt < M) {
|
|
for (int i = 0; i < bit_deg_; ++i)
|
|
acc_pos_[i] += q;
|
|
for (int i = 0; i < bit_deg_; ++i)
|
|
acc_pos_[i] %= R;
|
|
} else {
|
|
next_group();
|
|
row_cnt = 0;
|
|
}
|
|
}
|
|
void first_bit()
|
|
{
|
|
grp_num = 0;
|
|
grp_len = 0;
|
|
grp_cnt = 0;
|
|
row_cnt = 0;
|
|
row_ptr = TABLE::POS;
|
|
next_group();
|
|
}
|
|
};
|
|
|
|
LDPCInterface *create_ldpc(char *standard, char prefix, int number);
|
|
|
|
} // namespace ldpctool
|
|
|
|
#endif
|