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GainProcessor.h
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GainProcessor.h
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/** Use this processor to scale the gain of incoming audio samples. */
class GainProcessor final : public InternalProcessor,
public AudioProcessorParameter::Listener
{
public:
//==============================================================================
/** This is the default maximum gain:
a gain of 2.0f, being approxmiately 6 dB.
And, though it should be obvious, the default minimum is 0.0f.
*/
static constexpr auto defaultMaximumGainLinear = 2.0f;
//==============================================================================
/** Constructor.
@param gainRange The gain range the parameter can have.
By default, this goes from 0.0f to defaultMaximumGainLinear.
@see defaultMaximumGainLinear
*/
GainProcessor (NormalisableRange<float> gainRange = { 0.0f, defaultMaximumGainLinear });
//==============================================================================
/** Changes the gain.
A value of 1.0 means no gain change.
To boost, pass in values beyond 1.0.
To cut, pass in values under 1.0.
@param newGain New gain amount.
@see maximumGain
*/
void setGain (float newGain);
/** @returns the current gain. */
[[nodiscard]] float getGain() const noexcept;
/** @returns the minimum gain this gain processor supports.
@see NormalisableRange
*/
[[nodiscard]] float getMinimumGain() const noexcept;
/** @returns the maximum gain this gain processor supports.
@see NormalisableRange
*/
[[nodiscard]] float getMaximumGain() const noexcept;
//==============================================================================
/** @internal */
const String getName() const override { return NEEDS_TRANS ("Gain"); }
/** @internal */
Identifier getIdentifier() const override { return "gain"; }
/** @internal */
bool supportsDoublePrecisionProcessing() const override { return true; }
/** @internal */
void prepareToPlay (double, int) override;
/** @internal */
void processBlock (juce::AudioBuffer<float>&, MidiBuffer&) override;
/** @internal */
void processBlock (juce::AudioBuffer<double>&, MidiBuffer&) override;
/** @internal */
void parameterValueChanged (int, float) override;
/** @internal */
void parameterGestureChanged (int, bool) override;
private:
//==============================================================================
AudioParameterFloat* gainParameter = nullptr;
LinearSmoothedValue<float> floatGain { 1.0f };
LinearSmoothedValue<double> doubleGain { 1.0 };
//==============================================================================
template<typename FloatType>
void process (juce::AudioBuffer<FloatType>& buffer,
LinearSmoothedValue<FloatType>& value);
//==============================================================================
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (GainProcessor)
};