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62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
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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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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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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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template <int k>
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struct LagrangeResampleHelper
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{
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static forcedinline void calc (float& a, float b) noexcept { a *= b * (1.0f / k); }
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};
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template<>
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struct LagrangeResampleHelper<0>
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{
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static forcedinline void calc (float&, float) noexcept {}
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};
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template <int k>
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static float calcCoefficient (float input, float offset) noexcept
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{
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LagrangeResampleHelper<0 - k>::calc (input, -2.0f - offset);
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LagrangeResampleHelper<1 - k>::calc (input, -1.0f - offset);
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LagrangeResampleHelper<2 - k>::calc (input, 0.0f - offset);
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LagrangeResampleHelper<3 - k>::calc (input, 1.0f - offset);
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LagrangeResampleHelper<4 - k>::calc (input, 2.0f - offset);
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return input;
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}
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float Interpolators::LagrangeTraits::valueAtOffset (const float* inputs, float offset, int index) noexcept
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{
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float result = 0.0f;
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result += calcCoefficient<0> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<1> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<2> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<3> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<4> (inputs[index], offset);
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return result;
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}
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} // namespace juce
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