52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// This code is part of the sfizz library and is licensed under a BSD 2-clause
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// license. You should have receive a LICENSE.md file along with the code.
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// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
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#include "Smoothers.h"
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namespace sfz {
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Smoother::Smoother()
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{
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}
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void Smoother::setSmoothing(uint8_t smoothValue, float sampleRate)
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{
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smoothing = (smoothValue > 0);
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if (smoothing) {
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filter.setGain(std::tan(1.0f / (2 * Default::smoothTauPerStep * smoothValue * sampleRate)));
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}
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}
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void Smoother::reset(float value)
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{
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filter.reset(value);
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}
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void Smoother::process(absl::Span<const float> input, absl::Span<float> output, bool canShortcut)
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{
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CHECK_SPAN_SIZES(input, output);
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if (input.size() == 0)
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return;
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if (canShortcut) {
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float in = input.front();
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float rel = std::abs(in - current()) / (std::abs(in) + config::virtuallyZero);
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canShortcut = rel < config::smoothingShortcutThreshold;
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}
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if (canShortcut) {
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if (input.data() != output.data())
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copy<float>(input, output);
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filter.reset(input.back());
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} else if (smoothing) {
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filter.processLowpass(input, output);
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} else if (input.data() != output.data()) {
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copy<float>(input, output);
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}
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}
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}
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