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/*
* This file is part of AtracDEnc.
*
* AtracDEnc is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* AtracDEnc 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with AtracDEnc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include <cstdint>
#include <vector>
#include <algorithm>
#include <cmath>
#include <numeric>
#include "config.h"
#include <cstring>
template<class T>
inline void SwapArray(T* p, const size_t len) {
for (size_t i = 0, j = len - 1; i < len / 2; ++i, --j) {
T tmp = p[i];
p[i] = p[j];
p[j] = tmp;
}
}
template<size_t N>
inline void InvertSpectrInPlase(TFloat* in) {
for (size_t i = 0; i < N; i+=2)
in[i] *= -1;
}
template<size_t N>
inline std::vector<TFloat> InvertSpectr(const TFloat* in) {
std::vector<TFloat> buf(N);
std::memcpy(&buf[0], in, N * sizeof(TFloat));
InvertSpectrInPlase<N>(&buf[0]);
return buf;
}
inline uint16_t GetFirstSetBit(uint32_t x) {
static const uint16_t multiplyDeBruijnBitPosition[32] = {
0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31
};
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
return multiplyDeBruijnBitPosition[(uint32_t)(x * 0x07C4ACDDU) >> 27];
}
inline uint32_t Div8Ceil(uint32_t in) {
return 1 + (in - 1) / 8;
}
template<class T>
inline T CalcMedian(T* in, uint32_t len) {
std::vector<T> tmp(in, in+len);
std::sort(tmp.begin(), tmp.end());
uint32_t pos = (len - 1) / 2;
return tmp[pos];
}
template<class T>
inline T CalcEnergy(const std::vector<T>& in) {
return std::accumulate(in.begin(), in.end(), 0.0,
[](const T& a, const T& b) {
return a + b * b;
});
}
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