148 lines
5.0 KiB
C++
148 lines
5.0 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace dsp
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{
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/**
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Applies a gain to audio samples as single samples or AudioBlocks.
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@tags{DSP}
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*/
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template <typename FloatType>
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class Gain
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{
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public:
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Gain() noexcept {}
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//==============================================================================
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/** Applies a new gain as a linear value. */
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void setGainLinear (FloatType newGain) noexcept { gain.setValue (newGain); }
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/** Applies a new gain as a decibel value. */
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void setGainDecibels (FloatType newGainDecibels) noexcept { setGainLinear (Decibels::decibelsToGain<FloatType> (newGainDecibels)); }
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/** Returns the current gain as a linear value. */
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FloatType getGainLinear() const noexcept { return gain.getTargetValue(); }
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/** Returns the current gain in decibels. */
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FloatType getGainDecibels() const noexcept { return Decibels::gainToDecibels<FloatType> (getGainLinear()); }
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/** Sets the length of the ramp used for smoothing gain changes. */
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void setRampDurationSeconds (double newDurationSeconds) noexcept
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{
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if (rampDurationSeconds != newDurationSeconds)
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{
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rampDurationSeconds = newDurationSeconds;
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reset();
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}
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}
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/** Returns the ramp duration in seconds. */
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double getRampDurationSeconds() const noexcept { return rampDurationSeconds; }
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/** Returns true if the current value is currently being interpolated. */
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bool isSmoothing() const noexcept { return gain.isSmoothing(); }
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//==============================================================================
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/** Called before processing starts. */
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void prepare (const ProcessSpec& spec) noexcept
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{
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sampleRate = spec.sampleRate;
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reset();
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}
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/** Resets the internal state of the gain */
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void reset() noexcept
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{
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if (sampleRate > 0)
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gain.reset (sampleRate, rampDurationSeconds);
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}
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//==============================================================================
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/** Returns the result of processing a single sample. */
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template <typename SampleType>
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SampleType JUCE_VECTOR_CALLTYPE processSample (SampleType s) noexcept
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{
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return s * gain.getNextValue();
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}
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/** Processes the input and output buffers 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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auto&& inBlock = context.getInputBlock();
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auto&& outBlock = context.getOutputBlock();
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jassert (inBlock.getNumChannels() == outBlock.getNumChannels());
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jassert (inBlock.getNumSamples() == outBlock.getNumSamples());
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auto len = inBlock.getNumSamples();
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auto numChannels = inBlock.getNumChannels();
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if (context.isBypassed)
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{
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gain.skip (static_cast<int> (len));
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if (context.usesSeparateInputAndOutputBlocks())
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outBlock.copy (inBlock);
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return;
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}
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if (numChannels == 1)
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{
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auto* src = inBlock.getChannelPointer (0);
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auto* dst = outBlock.getChannelPointer (0);
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for (size_t i = 0; i < len; ++i)
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dst[i] = src[i] * gain.getNextValue();
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}
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else
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{
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auto* gains = static_cast<FloatType*> (alloca (sizeof (FloatType) * len));
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for (size_t i = 0; i < len; ++i)
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gains[i] = gain.getNextValue();
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for (size_t chan = 0; chan < numChannels; ++chan)
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FloatVectorOperations::multiply (outBlock.getChannelPointer (chan),
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inBlock.getChannelPointer (chan),
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gains, static_cast<int> (len));
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}
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}
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private:
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//==============================================================================
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LinearSmoothedValue<FloatType> gain;
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double sampleRate = 0, rampDurationSeconds = 0;
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};
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} // namespace dsp
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} // namespace juce
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