mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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78 lines
1.8 KiB
C++
78 lines
1.8 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 2014-2019, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 <villas/hooks/decimate.hpp>
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namespace villas {
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namespace node {
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void DecimateHook::start()
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{
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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 *cfg)
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{
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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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ret = json_unpack_ex(cfg, &err, 0, "{ s: i }",
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"ratio", &ratio
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);
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if (ret)
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throw ConfigError(cfg, err, "node-config-hook-decimate");
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state = STATE_PARSED;
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}
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int DecimateHook::process(sample *smp)
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{
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assert(state == STATE_STARTED);
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if (ratio && counter++ % ratio != 0)
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return HOOK_SKIP_SAMPLE;
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return HOOK_OK;
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}
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/* Register hook */
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static HookPlugin<DecimateHook> p(
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"decimate",
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"Downsamping by integer factor",
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HOOK_NODE_READ | HOOK_NODE_WRITE | HOOK_PATH,
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99
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);
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} /* namespace node */
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} /* namespace villas */
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/** @} */
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