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https://git.rwth-aachen.de/acs/public/villas/node/
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81 lines
1.7 KiB
C++
81 lines
1.7 KiB
C++
/** A sliding/moving window.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2021, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLAScommon
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#pragma once
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#include <villas/utils.hpp>
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namespace villas {
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namespace dsp {
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template<typename T>
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class Window {
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public:
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typedef typename std::vector<T>::size_type size_type;
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protected:
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std::vector<T> data;
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T init;
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size_type steps;
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size_type mask;
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size_type pos;
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public:
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Window(size_type s = 0, T i = 0) :
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init(i),
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steps(s)
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{
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size_type len = LOG2_CEIL(s);
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/* Allocate memory for circular history buffer */
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data = std::vector<T>(len, i);
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pos = len;
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mask = len - 1;
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}
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T update(T in)
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{
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T out = data[(pos - steps) & mask];
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data[pos++ & mask] = in;
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return out;
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}
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size_type getLength() const
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{
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return steps;
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}
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T operator[](int i) const
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{
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return data[(pos + i) & mask];
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}
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};
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} /* namespace dsp */
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} /* namespace villas */
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