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116 lines
4.4 KiB
C++
116 lines
4.4 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce::dsp
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{
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/**
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A simple noise gate with standard threshold, ratio, attack time and
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release time controls. Can be used as an expander if the ratio is low.
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@tags{DSP}
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*/
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template <typename SampleType>
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class NoiseGate
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{
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public:
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//==============================================================================
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/** Constructor. */
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NoiseGate();
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//==============================================================================
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/** Sets the threshold in dB of the noise-gate.*/
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void setThreshold (SampleType newThreshold);
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/** Sets the ratio of the noise-gate (must be higher or equal to 1).*/
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void setRatio (SampleType newRatio);
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/** Sets the attack time in milliseconds of the noise-gate.*/
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void setAttack (SampleType newAttack);
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/** Sets the release time in milliseconds of the noise-gate.*/
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void setRelease (SampleType newRelease);
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//==============================================================================
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/** Initialises the processor. */
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void prepare (const ProcessSpec& spec);
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/** Resets the internal state variables of the processor. */
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void reset();
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//==============================================================================
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/** Processes the input and output samples supplied in the processing context. */
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template <typename ProcessContext>
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void process (const ProcessContext& context) noexcept
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{
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const auto& inputBlock = context.getInputBlock();
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auto& outputBlock = context.getOutputBlock();
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const auto numChannels = outputBlock.getNumChannels();
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const auto numSamples = outputBlock.getNumSamples();
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jassert (inputBlock.getNumChannels() == numChannels);
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jassert (inputBlock.getNumSamples() == numSamples);
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if (context.isBypassed)
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{
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outputBlock.copyFrom (inputBlock);
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return;
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}
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for (size_t channel = 0; channel < numChannels; ++channel)
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{
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auto* inputSamples = inputBlock .getChannelPointer (channel);
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auto* outputSamples = outputBlock.getChannelPointer (channel);
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for (size_t i = 0; i < numSamples; ++i)
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outputSamples[i] = processSample ((int) channel, inputSamples[i]);
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}
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}
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/** Performs the processing operation on a single sample at a time. */
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SampleType processSample (int channel, SampleType inputValue);
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private:
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//==============================================================================
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void update();
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//==============================================================================
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SampleType threshold, thresholdInverse, currentRatio;
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BallisticsFilter<SampleType> envelopeFilter, RMSFilter;
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double sampleRate = 44100.0;
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SampleType thresholddB = -100, ratio = 10.0, attackTime = 1.0, releaseTime = 100.0;
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};
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} // namespace juce::dsp
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