mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
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/** 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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static int hook_decimate(struct hook *h, int when, struct hook_info *j)
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{
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struct {
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unsigned ratio;
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unsigned counter;
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} *private = hook_storage(h, when, sizeof(*private), NULL, NULL);
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switch (when) {
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case HOOK_PARSE:
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if (!h->parameter)
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error("Missing parameter for hook: '%s'", h->name);
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private->ratio = strtol(h->parameter, NULL, 10);
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if (!private->ratio)
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error("Invalid parameter '%s' for hook 'decimate'", h->parameter);
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private->counter = 0;
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break;
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case HOOK_READ:
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assert(j->smps);
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int i, ok;
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for (i = 0, ok = 0; i < j->cnt; i++) {
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if (private->counter++ % private->ratio == 0) {
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struct sample *tmp;
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tmp = j->smps[ok];
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j->smps[ok++] = j->smps[i];
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j->smps[i] = tmp;
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}
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}
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return ok;
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}
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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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.history = 0,
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.cb = hook_decimate,
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.type = HOOK_STORAGE | HOOK_DESTROY | HOOK_READ
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}
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};
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REGISTER_PLUGIN(&p)
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/** @} */
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