mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
/* Scale 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 <cstring>
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#include <villas/hook.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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class ScaleHook : public MultiSignalHook {
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protected:
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double scale;
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double offset;
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public:
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ScaleHook(Path *p, Node *n, int fl, int prio, bool en = true)
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: MultiSignalHook(p, n, fl, prio, en), scale(1.0), offset(0.0) {}
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virtual void 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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MultiSignalHook::parse(json);
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ret = json_unpack_ex(json, &err, 0, "{ s?: F, s?: F }", "scale", &scale,
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"offset", &offset);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-scale");
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state = State::PARSED;
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}
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virtual Hook::Reason process(struct Sample *smp) {
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for (auto index : signalIndices) {
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assert(index < smp->length);
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assert(state == State::STARTED);
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switch (sample_format(smp, index)) {
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case SignalType::INTEGER:
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smp->data[index].i *= scale;
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smp->data[index].i += offset;
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break;
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case SignalType::FLOAT:
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smp->data[index].f *= scale;
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smp->data[index].f += offset;
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break;
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case SignalType::COMPLEX:
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smp->data[index].z *= scale;
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smp->data[index].z += offset;
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break;
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default: {
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}
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}
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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,
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(int)Hook::Flags::PATH | (int)Hook::Flags::NODE_READ |
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(int)Hook::Flags::NODE_WRITE>
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p;
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} // namespace node
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} // namespace villas
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