ADSRReader.h

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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

 
#include "fx/EffectReader.h"
 
AUD_NAMESPACE_BEGIN

class AUD_API ADSRReader : public EffectReader
{
private:
    enum ADSRState
    {
        ADSR_STATE_INVALID = 0,     
        ADSR_STATE_ATTACK  = 1,     
        ADSR_STATE_DECAY   = 2,     
        ADSR_STATE_SUSTAIN = 3,     
        ADSR_STATE_RELEASE = 4      
    };

    float m_attack;

    float m_decay;

    float m_sustain;

    float m_release;

    ADSRState m_state;

    float m_level;
 
    // delete copy constructor and operator=
    ADSRReader(const ADSRReader&) = delete;
    ADSRReader& operator=(const ADSRReader&) = delete;
 
    void AUD_LOCAL nextState(ADSRState state);
 
public:
    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);

    void release();
};
 
AUD_NAMESPACE_END