Envelope.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/Effect.h"
 
AUD_NAMESPACE_BEGIN
 
class CallbackIIRFilterReader;
struct EnvelopeParameters;
 
class AUD_API Envelope : public Effect
{
private:
    const float m_attack;
 
    const float m_release;
 
    const float m_threshold;
 
    const float m_arthreshold;
 
    // delete copy constructor and operator=
    Envelope(const Envelope&) = delete;
    Envelope& operator=(const Envelope&) = delete;
 
public:
    Envelope(std::shared_ptr<ISound> sound, float attack, float release,
                        float threshold, float arthreshold);
 
    virtual std::shared_ptr<IReader> createReader();
 
    static sample_t AUD_LOCAL envelopeFilter(CallbackIIRFilterReader* reader, EnvelopeParameters* param);
 
    static void AUD_LOCAL endEnvelopeFilter(EnvelopeParameters* param);
};
 
AUD_NAMESPACE_END