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76 lines
No EOL
1.4 KiB
C
76 lines
No EOL
1.4 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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*********************************************************************************/
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/** @addtogroup hooks Hook functions
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* @{
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*/
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#include "hook.h"
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#include "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 = 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, config_setting_t *cfg)
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{
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struct decimate *p = h->_vd;
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if (!cfg)
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error("Missing configuration for hook: '%s'", plugin_name(h->_vt));
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if (!config_setting_lookup_int(cfg, "ratio", &p->ratio))
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cerror(cfg, "Missing setting 'ratio' for 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[], size_t *cnt)
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{
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struct decimate *p = 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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.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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.size = sizeof(struct decimate)
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}
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};
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REGISTER_PLUGIN(&p)
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/** @} */ |