mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
145 lines
3.3 KiB
C++
145 lines
3.3 KiB
C++
/** Scale hook.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, 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 <cstring>
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#include <villas/hook.hpp>
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#include <villas/sample.h>
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namespace villas {
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namespace node {
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class ScaleHook : public Hook {
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protected:
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char *signal_name;
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unsigned signal_index;
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double scale;
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double offset;
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public:
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ScaleHook(struct vpath *p, struct vnode *n, int fl, int prio, bool en = true) :
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Hook(p, n, fl, prio, en),
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signal_name(nullptr),
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signal_index(0),
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scale(1),
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offset(0)
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{ }
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virtual void prepare()
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{
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assert(state != State::STARTED);
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if (signal_name) {
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signal_index = vlist_lookup_index<struct signal>(&signals, signal_name);
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if (signal_index < 0)
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throw RuntimeError("Failed to find signal: {}", signal_name);
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}
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state = State::PREPARED;
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}
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virtual ~ScaleHook()
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{
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if (signal_name)
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free(signal_name);
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}
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virtual void parse(json_t *json)
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{
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int ret;
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json_t *json_signal;
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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?: F, s?: F, s: o }",
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"scale", &scale,
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"offset", &offset,
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"signal", &json_signal
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);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-scale");
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switch (json_typeof(json_signal)) {
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case JSON_STRING:
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signal_name = strdup(json_string_value(json_signal));
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break;
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case JSON_INTEGER:
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signal_name = nullptr;
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signal_index = json_integer_value(json_signal);
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break;
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default:
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throw ConfigError(json_signal, "node-config-hook-scale-signal", "Invalid value for setting 'signal'");
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}
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state = State::PARSED;
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}
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virtual Hook::Reason process(sample *smp)
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{
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int k = signal_index;
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assert(state == State::STARTED);
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switch (sample_format(smp, k)) {
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case SignalType::INTEGER:
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smp->data[k].i = smp->data[k].i * scale + offset;
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break;
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case SignalType::FLOAT:
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smp->data[k].f = smp->data[k].f * scale + offset;
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break;
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case SignalType::COMPLEX:
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smp->data[k].z = smp->data[k].z * (float) scale + (float) offset;
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break;
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case SignalType::BOOLEAN:
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smp->data[k].b = smp->data[k].b * (float) scale + (float) offset;
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break;
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default: { }
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}
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return Reason::OK;
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}
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};
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/* Register hook */
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static char n[] = "scale";
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static char d[] = "Scale signals by a factor and add offset";
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static HookPlugin<ScaleHook, n, d, (int) Hook::Flags::PATH | (int) Hook::Flags::NODE_READ | (int) Hook::Flags::NODE_WRITE> p;
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} /* namespace node */
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} /* namespace villas */
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/** @} */
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