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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 ButterworthCalculator.h
* @ingroup fx
* The ButterworthCalculator class.
*/
#include "fx/IDynamicIIRFilterCalculator.h"
AUD_NAMESPACE_BEGIN
/**
* The ButterworthCalculator class calculates fourth order Butterworth low pass
* filter coefficients for a dynamic DynamicIIRFilter.
*/
class AUD_LOCAL ButterworthCalculator : public IDynamicIIRFilterCalculator
{
private:
/**
* The attack value in seconds.
*/
const float m_frequency;
// delete copy constructor and operator=
ButterworthCalculator(const ButterworthCalculator&) = delete;
ButterworthCalculator& operator=(const ButterworthCalculator&) = delete;
public:
/**
* Creates a ButterworthCalculator object.
* @param frequency The cutoff frequency.
*/
ButterworthCalculator(float frequency);
virtual void recalculateCoefficients(SampleRate rate, std::vector<float> &b, std::vector<float> &a);
};
AUD_NAMESPACE_END
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