Gain and Ramp

A gain stage built with the juce::dsp module.
dsp::Gain<float>
ProcessSpec and prepare
Hosting a DSP processor in a demo
Source: examples/DSP/GainDemo.h on GitHub.
GainDemo.h
cpp
/*******************************************************************************
 The block below describes the properties of this PIP. A PIP is a short snippet
 of code that can be read by the Projucer and used to generate a JUCE project.

 BEGIN_JUCE_PIP_METADATA

 name:             GainDemo
 version:          1.0.0
 vendor:           JUCE
 website:          http://juce.com
 description:      Gain demo using the DSP module.

 dependencies:     juce_audio_basics, juce_audio_devices, juce_audio_formats,
                   juce_audio_processors, juce_audio_utils, juce_core,
                   juce_data_structures, juce_dsp, juce_events, juce_graphics,
                   juce_gui_basics, juce_gui_extra, juce_audio_processors_headless
 exporters:        xcode_mac, vs2022, vs2026, linux_make

 moduleFlags:      JUCE_STRICT_REFCOUNTEDPOINTER=1

 type:             Component
 mainClass:        GainDemo

 useLocalCopy:     1

 END_JUCE_PIP_METADATA

*******************************************************************************/

#pragma once

#include "../Assets/DemoUtilities.h"
#include "../Assets/DSPDemos_Common.h"

using namespace dsp;

//==============================================================================
struct GainDemoDSP
{
    void prepare (const ProcessSpec&)
    {
        gain.setGainDecibels (-6.0f);
    }

    void process (const ProcessContextReplacing<float>& context)
    {
        gain.process (context);
    }

    void reset()
    {
        gain.reset();
    }

    void updateParameters()
    {
        gain.setGainDecibels (static_cast<float> (gainParam.getCurrentValue()));
    }

    //==============================================================================
    Gain<float> gain;
    SliderParameter gainParam { { -100.0, 20.0 }, 3.0, -6.0, "Gain", "dB" };

    std::vector<DSPDemoParameterBase*> parameters { &gainParam };
};

struct GainDemo final : public Component
{
    GainDemo()
    {
        addAndMakeVisible (fileReaderComponent);
        setSize (750, 500);
    }

    void resized() override
    {
        fileReaderComponent.setBounds (getLocalBounds());
    }

    AudioFileReaderComponent<GainDemoDSP> fileReaderComponent;
};
Gain and Ramp ​

Gain and Ramp
