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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 LowpassCalculator.h
* @ingroup fx
* The LowpassCalculator class.
*/
#include "fx/IDynamicIIRFilterCalculator.h"
AUD_NAMESPACE_BEGIN
/**
* The LowpassCalculator class calculates low pass filter coefficients for a
* dynamic DynamicIIRFilter.
*/
class AUD_LOCAL LowpassCalculator : public IDynamicIIRFilterCalculator
{
private:
/**
* The cutoff frequency.
*/
const float m_frequency;
/**
* The Q factor.
*/
const float m_Q;
// delete copy constructor and operator=
LowpassCalculator(const LowpassCalculator&) = delete;
LowpassCalculator& operator=(const LowpassCalculator&) = delete;
public:
/**
* Creates a LowpassCalculator object.
* @param frequency The cutoff frequency.
* @param Q The Q factor of the filter. If unsure, use 1.0 as default.
*/
LowpassCalculator(float frequency, float Q);
virtual void recalculateCoefficients(SampleRate rate, std::vector<float> &b, std::vector<float> &a);
};
AUD_NAMESPACE_END
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