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Diffstat (limited to 'extern/audaspace/include/fx/ButterworthCalculator.h')
-rw-r--r-- | extern/audaspace/include/fx/ButterworthCalculator.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/extern/audaspace/include/fx/ButterworthCalculator.h b/extern/audaspace/include/fx/ButterworthCalculator.h new file mode 100644 index 00000000000..f4d4894c8b8 --- /dev/null +++ b/extern/audaspace/include/fx/ButterworthCalculator.h @@ -0,0 +1,55 @@ +/******************************************************************************* + * 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 |