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VILLASnode/lib/hooks/decimate.cpp
Steffen Vogel 7eec1bb753 update Steffens mail address
Signed-off-by: Steffen Vogel <post@steffenvogel.de>
2022-12-16 23:44:07 +01:00

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1.3 KiB
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/** Decimate hook.
*
* @author Steffen Vogel <post@steffenvogel.de>
* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
* @license Apache 2.0
*********************************************************************************/
#include <villas/hooks/decimate.hpp>
#include <villas/sample.hpp>
namespace villas {
namespace node {
void DecimateHook::start()
{
assert(state == State::PREPARED);
counter = 0;
state = State::STARTED;
}
void DecimateHook::parse(json_t *json)
{
int ret;
json_error_t err;
assert(state != State::STARTED);
Hook::parse(json);
ret = json_unpack_ex(json, &err, 0, "{ s: i, s?: b }",
"ratio", &ratio,
"renumber", &renumber
);
if (ret)
throw ConfigError(json, err, "node-config-hook-decimate");
state = State::PARSED;
}
Hook::Reason DecimateHook::process(struct Sample *smp)
{
assert(state == State::STARTED);
if (renumber)
smp->sequence /= ratio;
if (ratio && counter++ % ratio != 0)
return Hook::Reason::SKIP_SAMPLE;
return Reason::OK;
}
/* Register hook */
static char n[] = "decimate";
static char d[] = "Downsamping by integer factor";
static HookPlugin<DecimateHook, n, d, (int) Hook::Flags::NODE_READ | (int) Hook::Flags::NODE_WRITE | (int) Hook::Flags::PATH> p;
} /* namespace node */
} /* namespace villas */