/* Decimate hook. * * Author: Steffen Vogel * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University * SPDX-License-Identifier: Apache-2.0 */ #include #include 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 p; } // namespace node } // namespace villas