112 lines
4.2 KiB
C
112 lines
4.2 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace dsp
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{
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/**
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A class which provides multiple windowing functions useful for filter design
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and spectrum analyzers.
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The different functions provided here can be used by creating either a
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WindowingFunction object, or a static function to fill an array with the
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windowing method samples.
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@tags{DSP}
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*/
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template <typename FloatType>
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class JUCE_API WindowingFunction
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{
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public:
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//==============================================================================
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/** The windowing methods available. */
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enum WindowingMethod
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{
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rectangular = 0,
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triangular,
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hann,
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hamming,
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blackman,
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blackmanHarris,
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flatTop,
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kaiser,
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numWindowingMethods
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};
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//==============================================================================
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/** This constructor automatically fills a buffer of the specified size using
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the fillWindowingTables function and the specified arguments.
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@see fillWindowingTables
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*/
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WindowingFunction (size_t size, WindowingMethod,
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bool normalise = true, FloatType beta = 0);
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//==============================================================================
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/** Fills the content of the object array with a given windowing method table.
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@param size the size of the destination buffer allocated in the object
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@param type the type of windowing method being used
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@param normalise if the result must be normalised, creating a DC amplitude
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response of one
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@param beta an optional argument useful only for Kaiser's method
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which must be positive and sets the properties of the
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method (bandwidth and attenuation increases with beta)
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*/
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void fillWindowingTables (size_t size, WindowingMethod type,
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bool normalise = true, FloatType beta = 0) noexcept;
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/** Fills the content of an array with a given windowing method table.
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@param samples the destination buffer pointer
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@param size the size of the destination buffer allocated in the object
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@param normalise if the result must be normalised, creating a DC amplitude
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response of one
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@param beta an optional argument useful only for Kaiser's method,
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which must be positive and sets the properties of the
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method (bandwidth and attenuation increases with beta)
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*/
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static void fillWindowingTables (FloatType* samples, size_t size, WindowingMethod,
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bool normalise = true, FloatType beta = 0) noexcept;
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/** Multiplies the content of a buffer with the given window. */
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void multiplyWithWindowingTable (FloatType* samples, size_t size) noexcept;
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/** Returns the name of a given windowing method. */
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static const char* getWindowingMethodName (WindowingMethod) noexcept;
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private:
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//==============================================================================
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Array<FloatType> windowTable;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WindowingFunction)
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};
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} // namespace dsp
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} // namespace juce
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