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https://git.rwth-aachen.de/acs/public/villas/node/
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97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/** Decimate hook.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, 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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* VILLASnode
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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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/** @addtogroup hooks Hook functions
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* @{
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*/
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#include <villas/hook.h>
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#include <villas/plugin.h>
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struct decimate {
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int ratio;
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unsigned counter;
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};
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static int decimate_init(struct hook *h)
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{
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struct decimate *p = (struct decimate *) h->_vd;
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p->counter = 0;
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return 0;
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}
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static int decimate_parse(struct hook *h, json_t *cfg)
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{
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struct decimate *p = (struct decimate *) h->_vd;
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int ret;
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json_error_t err;
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ret = json_unpack_ex(cfg, &err, 0, "{ s: i }",
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"ratio", &p->ratio
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);
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if (ret)
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jerror(&err, "Failed to parse configuration of hook '%s'", plugin_name(h->_vt));
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return 0;
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}
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static int decimate_read(struct hook *h, struct sample *smps[], unsigned *cnt)
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{
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struct decimate *p = (struct decimate *) h->_vd;
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int i, ok;
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for (i = 0, ok = 0; i < *cnt; i++) {
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if (p->counter++ % p->ratio == 0) {
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struct sample *tmp;
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tmp = smps[ok];
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smps[ok++] = smps[i];
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smps[i] = tmp;
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}
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}
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*cnt = ok;
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return 0;
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}
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static struct plugin p = {
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.name = "decimate",
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.description = "Downsamping by integer factor",
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.type = PLUGIN_TYPE_HOOK,
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.hook = {
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.flags = HOOK_NODE | HOOK_PATH,
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.priority = 99,
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.init = decimate_init,
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.parse = decimate_parse,
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.read = decimate_read,
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.process= decimate_read,
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.size = sizeof(struct decimate)
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}
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};
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REGISTER_PLUGIN(&p)
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/** @} */
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