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61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/** A sliding/moving window.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2019, 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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#include <stdlib.h>
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#include <villas/window.h>
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#include <villas/utils.h>
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int window_init(struct window *w, size_t steps, double init)
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{
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size_t len = LOG2_CEIL(steps);
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/* Allocate memory for ciruclar history buffer */
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w->data = alloc(len * sizeof(double));
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if (!w->data)
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return -1;
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for (size_t i = 0; i < len; i++)
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w->data[i] = init;
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w->steps = steps;
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w->pos = len;
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w->mask = len - 1;
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return 0;
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}
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int window_destroy(struct window *w)
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{
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free(w->data);
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return 0;
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}
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double window_update(struct window *w, double in)
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{
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double out = w->data[(w->pos - w->steps) & w->mask];
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w->data[w->pos++ & w->mask] = in;
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return out;
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}
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