ZamGatePlugin.hpp

/*
 * ZamGate
 * Copyright (C) 2014  Damien Zammit <damien@zamaudio.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#ifndef ZAMGATEPLUGIN_HPP_INCLUDED
#define ZAMGATEPLUGIN_HPP_INCLUDED

#include "DistrhoPlugin.hpp"
#include <algorithm>

#define MAX_GATE 400

START_NAMESPACE_DISTRHO

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

class ZamGatePlugin : public Plugin
{
public:
	enum Parameters
	{
		paramAttack,
		paramRelease,
		paramThresh,
		paramMakeup,
		paramSidechain,
		paramGateclose,
		paramOpenshut,
		paramOutputLevel,
		paramGainR,
		paramCount
	};

	ZamGatePlugin();

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

	const char* getLabel() const noexcept override
	{
		return "ZamGate";
	}

	const char* getDescription() const noexcept override
	{
	    return "Gate plugin for ducking low gain sounds.";
	}

	const char* getMaker() const noexcept override
	{
		return "Damien Zammit";
	}

	const char* getHomePage() const noexcept override
	{
	    return "http://www.zamaudio.com";
	}

	const char* getLicense() const noexcept override
	{
		return "GPL v2+";
	}

	uint32_t getVersion() const noexcept override
	{
		return d_version(4, 2, 0);
	}

	int64_t getUniqueId() const noexcept override
	{
		return d_cconst('Z', 'G', 'A', 'T');
	}

	// -------------------------------------------------------------------
	// Init

	void initParameter(uint32_t index, Parameter& parameter) override;
	void initProgramName(uint32_t index, String& programName) override;
	void initAudioPort(bool input, uint32_t index, AudioPort& port) override;

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

	float getParameterValue(uint32_t index) const override;
	void  setParameterValue(uint32_t index, float value) override;
	void  loadProgram(uint32_t index) override;

	// -------------------------------------------------------------------
	void activate() override;
	void run(const float** inputs, float** outputs, uint32_t frames) override;

	static inline float
	sanitize_denormal(float v) {
		if(!std::isnormal(v) || !std::isfinite(v))
			return 0.f;
		return v;
	}

	static inline float
	from_dB(float gdb) {
		return (expf(0.05f*gdb*logf(10.f)));
	}

	static inline float
	to_dB(float g) {
		return (20.f*log10f(g));
	}

	// -------------------------------------------------------------------
	float attack,release,thresdb,makeup,sidechain,gateclose,openshut,gainr,outlevel; //parameters

	void pushsamplel(float samples[], float sample);
	float averageabs(float samples[]);

	float samplesl[MAX_GATE];
	float gatestatel;
	int posl;
};

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

END_NAMESPACE_DISTRHO

#endif