106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
|
/*
|
||
|
|
==============================================================================
|
||
|
|
|
||
|
|
This file is part of the JUCE library.
|
||
|
|
Copyright (c) 2020 - Raw Material Software Limited
|
||
|
|
|
||
|
|
JUCE is an open source library subject to commercial or open-source
|
||
|
|
licensing.
|
||
|
|
|
||
|
|
By using JUCE, you agree to the terms of both the JUCE 6 End-User License
|
||
|
|
Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
|
||
|
|
|
||
|
|
End User License Agreement: www.juce.com/juce-6-licence
|
||
|
|
Privacy Policy: www.juce.com/juce-privacy-policy
|
||
|
|
|
||
|
|
Or: You may also use this code under the terms of the GPL v3 (see
|
||
|
|
www.gnu.org/licenses).
|
||
|
|
|
||
|
|
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
|
||
|
|
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
|
||
|
|
DISCLAIMED.
|
||
|
|
|
||
|
|
==============================================================================
|
||
|
|
*/
|
||
|
|
|
||
|
|
namespace juce
|
||
|
|
{
|
||
|
|
namespace dsp
|
||
|
|
{
|
||
|
|
|
||
|
|
/**
|
||
|
|
A simple limiter with standard threshold and release time controls, featuring
|
||
|
|
two compressors and a hard clipper at 0 dB.
|
||
|
|
|
||
|
|
@tags{DSP}
|
||
|
|
*/
|
||
|
|
template <typename SampleType>
|
||
|
|
class Limiter
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
//==============================================================================
|
||
|
|
/** Constructor. */
|
||
|
|
Limiter() = default;
|
||
|
|
|
||
|
|
//==============================================================================
|
||
|
|
/** Sets the threshold in dB of the limiter.*/
|
||
|
|
void setThreshold (SampleType newThreshold);
|
||
|
|
|
||
|
|
/** Sets the release time in milliseconds of the limiter.*/
|
||
|
|
void setRelease (SampleType newRelease);
|
||
|
|
|
||
|
|
//==============================================================================
|
||
|
|
/** Initialises the processor. */
|
||
|
|
void prepare (const ProcessSpec& spec);
|
||
|
|
|
||
|
|
/** Resets the internal state variables of the processor. */
|
||
|
|
void reset();
|
||
|
|
|
||
|
|
//==============================================================================
|
||
|
|
/** Processes the input and output samples supplied in the processing context. */
|
||
|
|
template <typename ProcessContext>
|
||
|
|
void process (const ProcessContext& context) noexcept
|
||
|
|
{
|
||
|
|
const auto& inputBlock = context.getInputBlock();
|
||
|
|
auto& outputBlock = context.getOutputBlock();
|
||
|
|
const auto numChannels = outputBlock.getNumChannels();
|
||
|
|
const auto numSamples = outputBlock.getNumSamples();
|
||
|
|
|
||
|
|
jassert (inputBlock.getNumChannels() == numChannels);
|
||
|
|
jassert (inputBlock.getNumSamples() == numSamples);
|
||
|
|
|
||
|
|
if (context.isBypassed)
|
||
|
|
{
|
||
|
|
outputBlock.copyFrom (inputBlock);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
firstStageCompressor.process (context);
|
||
|
|
|
||
|
|
auto secondContext = ProcessContextReplacing<SampleType> (outputBlock);
|
||
|
|
secondStageCompressor.process (secondContext);
|
||
|
|
|
||
|
|
outputBlock.multiplyBy (outputVolume);
|
||
|
|
|
||
|
|
for (size_t channel = 0; channel < numChannels; ++channel)
|
||
|
|
{
|
||
|
|
FloatVectorOperations::clip (outputBlock.getChannelPointer (channel), outputBlock.getChannelPointer (channel),
|
||
|
|
(SampleType) -1.0, (SampleType) 1.0, (int) numSamples);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
//==============================================================================
|
||
|
|
void update();
|
||
|
|
|
||
|
|
//==============================================================================
|
||
|
|
Compressor<SampleType> firstStageCompressor, secondStageCompressor;
|
||
|
|
SmoothedValue<SampleType, ValueSmoothingTypes::Linear> outputVolume;
|
||
|
|
|
||
|
|
double sampleRate = 44100.0;
|
||
|
|
SampleType thresholddB = -10.0, releaseTime = 100.0;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace dsp
|
||
|
|
} // namespace juce
|