mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-25 09:18:54 -05:00
152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019 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/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QString>
|
|
#include "hbfilterchainconverter.h"
|
|
|
|
double HBFilterChainConverter::convertToIndexes(unsigned int log2, unsigned int chainHash, std::vector<unsigned int>& chainIndexes)
|
|
{
|
|
chainIndexes.clear();
|
|
|
|
if (log2 == 0) {
|
|
return 0.0;
|
|
}
|
|
|
|
unsigned int s = 1;
|
|
unsigned int u = chainHash;
|
|
|
|
for (unsigned int i = 0; i < log2; i++) {
|
|
s *= 3;
|
|
}
|
|
|
|
u %= s; // scale
|
|
unsigned int ix = log2;
|
|
double shift = 0.0;
|
|
double shift_stage = 1.0 / (1<<(log2+1));
|
|
|
|
// base3 conversion
|
|
do
|
|
{
|
|
int r = u % 3;
|
|
chainIndexes.push_back(r);
|
|
shift += (r-1)*shift_stage;
|
|
shift_stage *= 2;
|
|
u /= 3;
|
|
ix--;
|
|
} while (u);
|
|
|
|
// continue shift with leading zeroes. ix has the number of leading zeroes.
|
|
for (unsigned int i = 0; i < ix; i++)
|
|
{
|
|
chainIndexes.push_back(0);
|
|
shift -= shift_stage;
|
|
shift_stage *= 2;
|
|
}
|
|
|
|
return shift;
|
|
}
|
|
|
|
double HBFilterChainConverter::convertToString(unsigned int log2, unsigned int chainHash, QString& chainString)
|
|
{
|
|
if (log2 == 0)
|
|
{
|
|
chainString = "C";
|
|
return 0.0;
|
|
}
|
|
|
|
unsigned int s = 1;
|
|
unsigned int u = chainHash;
|
|
chainString = "";
|
|
|
|
for (unsigned int i = 0; i < log2; i++) {
|
|
s *= 3;
|
|
}
|
|
|
|
u %= s; // scale
|
|
unsigned int ix = log2;
|
|
double shift = 0.0;
|
|
double shift_stage = 1.0 / (1<<(log2+1));
|
|
|
|
// base3 conversion
|
|
do
|
|
{
|
|
int r = u % 3;
|
|
|
|
if (r == 0) {
|
|
chainString = "L" + chainString;
|
|
} else if (r == 1) {
|
|
chainString = "C" + chainString;
|
|
} else if (r == 2) {
|
|
chainString = "H" + chainString;
|
|
}
|
|
|
|
shift += (r-1)*shift_stage;
|
|
shift_stage *= 2;
|
|
u /= 3;
|
|
ix--;
|
|
} while (u);
|
|
|
|
// continue shift with leading zeroes. ix has the number of leading zeroes.
|
|
for (unsigned int i = 0; i < ix; i++)
|
|
{
|
|
chainString = "L" + chainString;
|
|
shift -= shift_stage;
|
|
shift_stage *= 2;
|
|
}
|
|
|
|
return shift;
|
|
}
|
|
|
|
double HBFilterChainConverter::getShiftFactor(unsigned int log2, unsigned int chainHash)
|
|
{
|
|
if (log2 == 0)
|
|
{
|
|
return 0.0;
|
|
}
|
|
|
|
unsigned int s = 1;
|
|
unsigned int u = chainHash;
|
|
|
|
for (unsigned int i = 0; i < log2; i++) {
|
|
s *= 3;
|
|
}
|
|
|
|
u %= s; // scale
|
|
unsigned int ix = log2;
|
|
double shift = 0.0;
|
|
double shift_stage = 1.0 / (1<<(log2+1));
|
|
|
|
// base3 conversion
|
|
do
|
|
{
|
|
int r = u % 3;
|
|
shift += (r-1)*shift_stage;
|
|
shift_stage *= 2;
|
|
u /= 3;
|
|
ix--;
|
|
} while (u);
|
|
|
|
// continue shift with leading zeroes. ix has the number of leading zeroes.
|
|
for (unsigned int i = 0; i < ix; i++)
|
|
{
|
|
shift -= shift_stage;
|
|
shift_stage *= 2;
|
|
}
|
|
|
|
return shift;
|
|
}
|