DPF/examples/Gain/GainExamplePlugin.cpp

/*
 * DISTRHO Plugin Framework (DPF)
 * Copyright (C) 2012-2015 Filipe Coelho <falktx@falktx.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any purpose with
 * or without fee is hereby granted, provided that the above copyright notice and this
 * permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "DistrhoPlugin.hpp"

START_NAMESPACE_DISTRHO

// -----------------------------------------------------------------------------------------------------------

/**
  Plugin that demonstrates the basic API in DPF.
 */
class GainExamplePlugin : public Plugin
{
public:
    GainExamplePlugin()
        : Plugin(1, 0, 0), // 1 parameter
          fGain(1.0)
    {
    }

    ~GainExamplePlugin() override
    {
    }

protected:
   /* --------------------------------------------------------------------------------------------------------
    * Information */

   /**
      Get the plugin label.
      This label is a short restricted name consisting of only _, a-z, A-Z and 0-9 characters.
    */
    const char* getLabel() const override
    {
        return "Gain";
    }

   /**
      Get an extensive comment/description about the plugin.
    */
    const char* getDescription() const override
    {
        return "Plugin that demonstrates the basic API in DPF.";
    }

   /**
      Get the plugin author/maker.
    */
    const char* getMaker() const override
    {
        return "DISTRHO";
    }

   /**
      Get the plugin homepage.
    */
    const char* getHomePage() const override
    {
        return "https://github.com/DISTRHO/DPF";
    }

   /**
      Get the plugin license name (a single line of text).
      For commercial plugins this should return some short copyright information.
    */
    const char* getLicense() const override
    {
        return "ISC";
    }

   /**
      Get the plugin version, in hexadecimal.
    */
    uint32_t getVersion() const override
    {
        return d_version(1, 0, 0);
    }

   /**
      Get the plugin unique Id.
      This value is used by LADSPA, DSSI and VST plugin formats.
    */
    int64_t getUniqueId() const override
    {
        return d_cconst('d', 'G', 'a', 'i');
    }

   /* --------------------------------------------------------------------------------------------------------
    * Init */

   /**
      Initialize the parameter @a index.
      This function will be called once, shortly after the plugin is created.
    */
    void initParameter(uint32_t index, Parameter& parameter) override
    {
        if (index != 0)
            return;

        parameter.hints  = kParameterIsAutomable;
        parameter.name   = "Gain";
        parameter.symbol = "gain";
        parameter.unit   = "dB";
        parameter.ranges.def = 1.0f;
        parameter.ranges.min = 0.0f;
        parameter.ranges.max = 1.0f;
    }

   /* --------------------------------------------------------------------------------------------------------
    * Internal data */

   /**
      Get the current value of a parameter.
      The host may call this function from any context, including realtime processing.
    */
    float getParameterValue(uint32_t index) const override
    {
        if (index != 0)
            return 0.0f;

        return fGain;
    }

   /**
      Change a parameter value.
      The host may call this function from any context, including realtime processing.
      When a parameter is marked as automable, you must ensure no non-realtime operations are performed.
      @note This function will only be called for parameter inputs.
    */
    void setParameterValue(uint32_t index, float value) override
    {
        if (index != 0)
            return;

        fGain = value;
    }

   /* --------------------------------------------------------------------------------------------------------
    * Audio/MIDI Processing */

   /**
      Run/process function for plugins without MIDI input.
      @note Some parameters might be null if there are no audio inputs or outputs.
    */
    void run(const float** inputs, float** outputs, uint32_t frames) override
    {
        const float* const in  = inputs[0];
        /* */ float* const out = outputs[0];
        uint32_t i;

        for (i = 0; i < frames; i++) {
            out[i] = in[i] * fGain;
        }
    }

    // -------------------------------------------------------------------------------------------------------

private:
    // Parameters
    float fGain;

   /**
      Set our plugin class as non-copyable and add a leak detector just in case.
    */
    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(GainExamplePlugin)
};

/* ------------------------------------------------------------------------------------------------------------
 * Plugin entry point, called by DPF to create a new plugin instance. */

Plugin* createPlugin()
{
    return new GainExamplePlugin();
}

// -----------------------------------------------------------------------------------------------------------

END_NAMESPACE_DISTRHO