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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#pragma once
/**
* @file ADSRReader.h
* @ingroup fx
* The ADSRReader class.
*/
#include "fx/EffectReader.h"
AUD_NAMESPACE_BEGIN
/**
* This class is an ADSR filters.
*/
class AUD_API ADSRReader : public EffectReader
{
private:
enum ADSRState
{
ADSR_STATE_INVALID = 0, /// Invalid ADSR state or finished.
ADSR_STATE_ATTACK = 1, /// Initial attack state.
ADSR_STATE_DECAY = 2, /// Decay state.
ADSR_STATE_SUSTAIN = 3, /// Sustain state.
ADSR_STATE_RELEASE = 4 /// Release state.
};
/**
* Attack time.
*/
float m_attack;
/**
* Decay time.
*/
float m_decay;
/**
* Sustain level.
*/
float m_sustain;
/**
* Release time.
*/
float m_release;
/**
* Current state.
*/
ADSRState m_state;
/**
* Current level.
*/
float m_level;
// delete copy constructor and operator=
ADSRReader(const ADSRReader&) = delete;
ADSRReader& operator=(const ADSRReader&) = delete;
void AUD_LOCAL nextState(ADSRState state);
public:
/**
* Creates a new ADSR reader.
* \param reader The reader to read from.
* \param attack The attack time in seconds.
* \param decay The decay time in seconds.
* \param sustain The sustain level, should be in range [0 - 1].
* \param release The release time in seconds.
*/
ADSRReader(std::shared_ptr<IReader> reader, float attack, float decay, float sustain, float release);
virtual ~ADSRReader();
virtual void read(int& length, bool& eos, sample_t* buffer);
/**
* Triggers the release.
*/
void release();
};
AUD_NAMESPACE_END
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