mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
/* Decimate hook.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <villas/hooks/decimate.hpp>
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#include <villas/sample.hpp>
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namespace villas {
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namespace node {
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void DecimateHook::start() {
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assert(state == State::PREPARED);
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counter = 0;
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state = State::STARTED;
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}
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void DecimateHook::parse(json_t *json) {
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int ret;
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json_error_t err;
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assert(state != State::STARTED);
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Hook::parse(json);
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ret = json_unpack_ex(json, &err, 0, "{ s: i, s?: b }", "ratio", &ratio,
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"renumber", &renumber);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-decimate");
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state = State::PARSED;
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}
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Hook::Reason DecimateHook::process(struct Sample *smp) {
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assert(state == State::STARTED);
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if (renumber)
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smp->sequence /= ratio;
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if (ratio && counter++ % ratio != 0)
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return Hook::Reason::SKIP_SAMPLE;
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return Reason::OK;
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}
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// Register hook
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static char n[] = "decimate";
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static char d[] = "Downsamping by integer factor";
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static HookPlugin<DecimateHook, n, d,
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(int)Hook::Flags::NODE_READ | (int)Hook::Flags::NODE_WRITE |
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(int)Hook::Flags::PATH>
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p;
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} // namespace node
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} // namespace villas
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